Mercurial > repos > shellac > sam_consensus_v3

annotate env/lib/python3.9/site-packages/bs4/element.py @ 0:4f3585e2f14b draft default tip

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"planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
author shellac
date Mon, 22 Mar 2021 18:12:50 +0000
parents
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Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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0
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1 # Use of this source code is governed by the MIT license.
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2 __license__ = "MIT"
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3
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4 try:
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5 from collections.abc import Callable # Python 3.6
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6 except ImportError as e:
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7 from collections import Callable
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8 import re
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9 import sys
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10 import warnings
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11 try:
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12 import soupsieve
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13 except ImportError as e:
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14 soupsieve = None
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15 warnings.warn(
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16 'The soupsieve package is not installed. CSS selectors cannot be used.'
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17 )
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18
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19 from bs4.formatter import (
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20 Formatter,
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21 HTMLFormatter,
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22 XMLFormatter,
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23 )
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24
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25 DEFAULT_OUTPUT_ENCODING = "utf-8"
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26 PY3K = (sys.version_info[0] > 2)
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27
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28 nonwhitespace_re = re.compile(r"\S+")
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29
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30 # NOTE: This isn't used as of 4.7.0. I'm leaving it for a little bit on
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31 # the off chance someone imported it for their own use.
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32 whitespace_re = re.compile(r"\s+")
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33
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34 def _alias(attr):
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35 """Alias one attribute name to another for backward compatibility"""
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36 @property
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37 def alias(self):
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38 return getattr(self, attr)
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39
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40 @alias.setter
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41 def alias(self):
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42 return setattr(self, attr)
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43 return alias
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44
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45
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46 # These encodings are recognized by Python (so PageElement.encode
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47 # could theoretically support them) but XML and HTML don't recognize
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48 # them (so they should not show up in an XML or HTML document as that
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49 # document's encoding).
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50 #
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51 # If an XML document is encoded in one of these encodings, no encoding
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52 # will be mentioned in the XML declaration. If an HTML document is
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53 # encoded in one of these encodings, and the HTML document has a
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54 # <meta> tag that mentions an encoding, the encoding will be given as
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55 # the empty string.
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56 #
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57 # Source:
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58 # https://docs.python.org/3/library/codecs.html#python-specific-encodings
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59 PYTHON_SPECIFIC_ENCODINGS = set([
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60 "idna",
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61 "mbcs",
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62 "oem",
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63 "palmos",
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64 "punycode",
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65 "raw_unicode_escape",
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66 "undefined",
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67 "unicode_escape",
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68 "raw-unicode-escape",
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69 "unicode-escape",
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70 "string-escape",
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71 "string_escape",
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72 ])
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73
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74
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75 class NamespacedAttribute(str):
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76 """A namespaced string (e.g. 'xml:lang') that remembers the namespace
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77 ('xml') and the name ('lang') that were used to create it.
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78 """
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79
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80 def __new__(cls, prefix, name=None, namespace=None):
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81 if not name:
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82 # This is the default namespace. Its name "has no value"
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83 # per https://www.w3.org/TR/xml-names/#defaulting
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84 name = None
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85
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86 if name is None:
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87 obj = str.__new__(cls, prefix)
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88 elif prefix is None:
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89 # Not really namespaced.
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90 obj = str.__new__(cls, name)
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91 else:
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92 obj = str.__new__(cls, prefix + ":" + name)
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93 obj.prefix = prefix
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94 obj.name = name
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95 obj.namespace = namespace
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96 return obj
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97
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98 class AttributeValueWithCharsetSubstitution(str):
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99 """A stand-in object for a character encoding specified in HTML."""
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100
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101 class CharsetMetaAttributeValue(AttributeValueWithCharsetSubstitution):
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102 """A generic stand-in for the value of a meta tag's 'charset' attribute.
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103
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104 When Beautiful Soup parses the markup '<meta charset="utf8">', the
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105 value of the 'charset' attribute will be one of these objects.
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106 """
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107
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108 def __new__(cls, original_value):
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109 obj = str.__new__(cls, original_value)
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110 obj.original_value = original_value
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111 return obj
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112
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113 def encode(self, encoding):
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114 """When an HTML document is being encoded to a given encoding, the
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115 value of a meta tag's 'charset' is the name of the encoding.
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116 """
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117 if encoding in PYTHON_SPECIFIC_ENCODINGS:
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118 return ''
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119 return encoding
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120
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121
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122 class ContentMetaAttributeValue(AttributeValueWithCharsetSubstitution):
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123 """A generic stand-in for the value of a meta tag's 'content' attribute.
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124
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125 When Beautiful Soup parses the markup:
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126 <meta http-equiv="content-type" content="text/html; charset=utf8">
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127
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128 The value of the 'content' attribute will be one of these objects.
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129 """
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130
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131 CHARSET_RE = re.compile(r"((^|;)\s*charset=)([^;]*)", re.M)
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132
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133 def __new__(cls, original_value):
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134 match = cls.CHARSET_RE.search(original_value)
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135 if match is None:
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136 # No substitution necessary.
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137 return str.__new__(str, original_value)
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138
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139 obj = str.__new__(cls, original_value)
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140 obj.original_value = original_value
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141 return obj
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142
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143 def encode(self, encoding):
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144 if encoding in PYTHON_SPECIFIC_ENCODINGS:
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145 return ''
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146 def rewrite(match):
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147 return match.group(1) + encoding
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148 return self.CHARSET_RE.sub(rewrite, self.original_value)
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149
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150
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151 class PageElement(object):
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152 """Contains the navigational information for some part of the page:
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153 that is, its current location in the parse tree.
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154
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155 NavigableString, Tag, etc. are all subclasses of PageElement.
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156 """
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157
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158 def setup(self, parent=None, previous_element=None, next_element=None,
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159 previous_sibling=None, next_sibling=None):
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160 """Sets up the initial relations between this element and
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161 other elements.
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162
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163 :param parent: The parent of this element.
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164
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165 :param previous_element: The element parsed immediately before
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166 this one.
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167
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168 :param next_element: The element parsed immediately before
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169 this one.
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170
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171 :param previous_sibling: The most recently encountered element
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172 on the same level of the parse tree as this one.
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173
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174 :param previous_sibling: The next element to be encountered
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175 on the same level of the parse tree as this one.
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176 """
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177 self.parent = parent
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178
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179 self.previous_element = previous_element
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180 if previous_element is not None:
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181 self.previous_element.next_element = self
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182
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183 self.next_element = next_element
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184 if self.next_element is not None:
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185 self.next_element.previous_element = self
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186
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187 self.next_sibling = next_sibling
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188 if self.next_sibling is not None:
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189 self.next_sibling.previous_sibling = self
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190
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191 if (previous_sibling is None
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192 and self.parent is not None and self.parent.contents):
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193 previous_sibling = self.parent.contents[-1]
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194
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195 self.previous_sibling = previous_sibling
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196 if previous_sibling is not None:
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197 self.previous_sibling.next_sibling = self
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198
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199 def format_string(self, s, formatter):
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200 """Format the given string using the given formatter.
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201
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202 :param s: A string.
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203 :param formatter: A Formatter object, or a string naming one of the standard formatters.
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204 """
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205 if formatter is None:
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206 return s
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207 if not isinstance(formatter, Formatter):
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208 formatter = self.formatter_for_name(formatter)
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209 output = formatter.substitute(s)
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210 return output
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211
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212 def formatter_for_name(self, formatter):
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213 """Look up or create a Formatter for the given identifier,
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214 if necessary.
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215
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216 :param formatter: Can be a Formatter object (used as-is), a
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217 function (used as the entity substitution hook for an
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218 XMLFormatter or HTMLFormatter), or a string (used to look
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219 up an XMLFormatter or HTMLFormatter in the appropriate
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220 registry.
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221 """
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222 if isinstance(formatter, Formatter):
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223 return formatter
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224 if self._is_xml:
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225 c = XMLFormatter
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226 else:
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227 c = HTMLFormatter
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228 if isinstance(formatter, Callable):
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229 return c(entity_substitution=formatter)
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230 return c.REGISTRY[formatter]
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231
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232 @property
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233 def _is_xml(self):
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234 """Is this element part of an XML tree or an HTML tree?
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235
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236 This is used in formatter_for_name, when deciding whether an
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237 XMLFormatter or HTMLFormatter is more appropriate. It can be
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238 inefficient, but it should be called very rarely.
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239 """
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240 if self.known_xml is not None:
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241 # Most of the time we will have determined this when the
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242 # document is parsed.
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243 return self.known_xml
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244
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245 # Otherwise, it's likely that this element was created by
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246 # direct invocation of the constructor from within the user's
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247 # Python code.
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248 if self.parent is None:
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249 # This is the top-level object. It should have .known_xml set
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250 # from tree creation. If not, take a guess--BS is usually
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251 # used on HTML markup.
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252 return getattr(self, 'is_xml', False)
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253 return self.parent._is_xml
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254
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255 nextSibling = _alias("next_sibling") # BS3
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256 previousSibling = _alias("previous_sibling") # BS3
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257
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258 def replace_with(self, replace_with):
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259 """Replace this PageElement with another one, keeping the rest of the
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260 tree the same.
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261
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262 :param replace_with: A PageElement.
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263 :return: `self`, no longer part of the tree.
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264 """
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265 if self.parent is None:
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266 raise ValueError(
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267 "Cannot replace one element with another when the "
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268 "element to be replaced is not part of a tree.")
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269 if replace_with is self:
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270 return
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271 if replace_with is self.parent:
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272 raise ValueError("Cannot replace a Tag with its parent.")
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273 old_parent = self.parent
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274 my_index = self.parent.index(self)
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275 self.extract(_self_index=my_index)
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276 old_parent.insert(my_index, replace_with)
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277 return self
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278 replaceWith = replace_with # BS3
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279
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280 def unwrap(self):
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281 """Replace this PageElement with its contents.
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282
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283 :return: `self`, no longer part of the tree.
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284 """
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285 my_parent = self.parent
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286 if self.parent is None:
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287 raise ValueError(
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288 "Cannot replace an element with its contents when that"
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289 "element is not part of a tree.")
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290 my_index = self.parent.index(self)
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291 self.extract(_self_index=my_index)
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292 for child in reversed(self.contents[:]):
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293 my_parent.insert(my_index, child)
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294 return self
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295 replace_with_children = unwrap
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296 replaceWithChildren = unwrap # BS3
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297
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298 def wrap(self, wrap_inside):
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299 """Wrap this PageElement inside another one.
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300
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301 :param wrap_inside: A PageElement.
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302 :return: `wrap_inside`, occupying the position in the tree that used
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303 to be occupied by `self`, and with `self` inside it.
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304 """
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305 me = self.replace_with(wrap_inside)
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306 wrap_inside.append(me)
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307 return wrap_inside
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308
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309 def extract(self, _self_index=None):
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310 """Destructively rips this element out of the tree.
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311
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312 :param _self_index: The location of this element in its parent's
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313 .contents, if known. Passing this in allows for a performance
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314 optimization.
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315
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316 :return: `self`, no longer part of the tree.
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317 """
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318 if self.parent is not None:
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319 if _self_index is None:
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320 _self_index = self.parent.index(self)
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321 del self.parent.contents[_self_index]
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322
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323 #Find the two elements that would be next to each other if
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324 #this element (and any children) hadn't been parsed. Connect
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325 #the two.
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326 last_child = self._last_descendant()
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327 next_element = last_child.next_element
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328
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329 if (self.previous_element is not None and
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330 self.previous_element is not next_element):
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331 self.previous_element.next_element = next_element
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332 if next_element is not None and next_element is not self.previous_element:
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333 next_element.previous_element = self.previous_element
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334 self.previous_element = None
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335 last_child.next_element = None
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336
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337 self.parent = None
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338 if (self.previous_sibling is not None
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339 and self.previous_sibling is not self.next_sibling):
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340 self.previous_sibling.next_sibling = self.next_sibling
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341 if (self.next_sibling is not None
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342 and self.next_sibling is not self.previous_sibling):
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343 self.next_sibling.previous_sibling = self.previous_sibling
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344 self.previous_sibling = self.next_sibling = None
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345 return self
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346
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347 def _last_descendant(self, is_initialized=True, accept_self=True):
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348 """Finds the last element beneath this object to be parsed.
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349
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350 :param is_initialized: Has `setup` been called on this PageElement
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351 yet?
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352 :param accept_self: Is `self` an acceptable answer to the question?
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353 """
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354 if is_initialized and self.next_sibling is not None:
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355 last_child = self.next_sibling.previous_element
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356 else:
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357 last_child = self
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358 while isinstance(last_child, Tag) and last_child.contents:
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359 last_child = last_child.contents[-1]
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360 if not accept_self and last_child is self:
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361 last_child = None
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362 return last_child
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363 # BS3: Not part of the API!
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364 _lastRecursiveChild = _last_descendant
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365
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366 def insert(self, position, new_child):
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367 """Insert a new PageElement in the list of this PageElement's children.
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368
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369 This works the same way as `list.insert`.
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370
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371 :param position: The numeric position that should be occupied
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372 in `self.children` by the new PageElement.
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373 :param new_child: A PageElement.
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374 """
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375 if new_child is None:
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376 raise ValueError("Cannot insert None into a tag.")
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377 if new_child is self:
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378 raise ValueError("Cannot insert a tag into itself.")
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379 if (isinstance(new_child, str)
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380 and not isinstance(new_child, NavigableString)):
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diff changeset
381 new_child = NavigableString(new_child)
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parents:
diff changeset
382
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parents:
diff changeset
383 from bs4 import BeautifulSoup
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parents:
diff changeset
384 if isinstance(new_child, BeautifulSoup):
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parents:
diff changeset
385 # We don't want to end up with a situation where one BeautifulSoup
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parents:
diff changeset
386 # object contains another. Insert the children one at a time.
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parents:
diff changeset
387 for subchild in list(new_child.contents):
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parents:
diff changeset
388 self.insert(position, subchild)
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parents:
diff changeset
389 position += 1
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parents:
diff changeset
390 return
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parents:
diff changeset
391 position = min(position, len(self.contents))
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parents:
diff changeset
392 if hasattr(new_child, 'parent') and new_child.parent is not None:
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parents:
diff changeset
393 # We're 'inserting' an element that's already one
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parents:
diff changeset
394 # of this object's children.
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parents:
diff changeset
395 if new_child.parent is self:
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parents:
diff changeset
396 current_index = self.index(new_child)
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parents:
diff changeset
397 if current_index < position:
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parents:
diff changeset
398 # We're moving this element further down the list
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parents:
diff changeset
399 # of this object's children. That means that when
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parents:
diff changeset
400 # we extract this element, our target index will
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parents:
diff changeset
401 # jump down one.
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parents:
diff changeset
402 position -= 1
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parents:
diff changeset
403 new_child.extract()
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parents:
diff changeset
404
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diff changeset
405 new_child.parent = self
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parents:
diff changeset
406 previous_child = None
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parents:
diff changeset
407 if position == 0:
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diff changeset
408 new_child.previous_sibling = None
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diff changeset
409 new_child.previous_element = self
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diff changeset
410 else:
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411 previous_child = self.contents[position - 1]
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parents:
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412 new_child.previous_sibling = previous_child
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parents:
diff changeset
413 new_child.previous_sibling.next_sibling = new_child
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parents:
diff changeset
414 new_child.previous_element = previous_child._last_descendant(False)
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parents:
diff changeset
415 if new_child.previous_element is not None:
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parents:
diff changeset
416 new_child.previous_element.next_element = new_child
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parents:
diff changeset
417
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parents:
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418 new_childs_last_element = new_child._last_descendant(False)
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parents:
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419
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parents:
diff changeset
420 if position >= len(self.contents):
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diff changeset
421 new_child.next_sibling = None
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422
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parents:
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423 parent = self
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parents:
diff changeset
424 parents_next_sibling = None
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parents:
diff changeset
425 while parents_next_sibling is None and parent is not None:
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parents:
diff changeset
426 parents_next_sibling = parent.next_sibling
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parents:
diff changeset
427 parent = parent.parent
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parents:
diff changeset
428 if parents_next_sibling is not None:
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parents:
diff changeset
429 # We found the element that comes next in the document.
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parents:
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430 break
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431 if parents_next_sibling is not None:
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parents:
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432 new_childs_last_element.next_element = parents_next_sibling
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433 else:
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parents:
diff changeset
434 # The last element of this tag is the last element in
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parents:
diff changeset
435 # the document.
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parents:
diff changeset
436 new_childs_last_element.next_element = None
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437 else:
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438 next_child = self.contents[position]
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diff changeset
439 new_child.next_sibling = next_child
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parents:
diff changeset
440 if new_child.next_sibling is not None:
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parents:
diff changeset
441 new_child.next_sibling.previous_sibling = new_child
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parents:
diff changeset
442 new_childs_last_element.next_element = next_child
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parents:
diff changeset
443
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parents:
diff changeset
444 if new_childs_last_element.next_element is not None:
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parents:
diff changeset
445 new_childs_last_element.next_element.previous_element = new_childs_last_element
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parents:
diff changeset
446 self.contents.insert(position, new_child)
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parents:
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447
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parents:
diff changeset
448 def append(self, tag):
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parents:
diff changeset
449 """Appends the given PageElement to the contents of this one.
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diff changeset
450
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parents:
diff changeset
451 :param tag: A PageElement.
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parents:
diff changeset
452 """
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parents:
diff changeset
453 self.insert(len(self.contents), tag)
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parents:
diff changeset
454
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parents:
diff changeset
455 def extend(self, tags):
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parents:
diff changeset
456 """Appends the given PageElements to this one's contents.
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parents:
diff changeset
457
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parents:
diff changeset
458 :param tags: A list of PageElements.
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parents:
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459 """
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parents:
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460 if isinstance(tags, Tag):
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parents:
diff changeset
461 # Calling self.append() on another tag's contents will change
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parents:
diff changeset
462 # the list we're iterating over. Make a list that won't
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parents:
diff changeset
463 # change.
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parents:
diff changeset
464 tags = list(tags.contents)
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parents:
diff changeset
465 for tag in tags:
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parents:
diff changeset
466 self.append(tag)
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467
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parents:
diff changeset
468 def insert_before(self, *args):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
469 """Makes the given element(s) the immediate predecessor of this one.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
470
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parents:
diff changeset
471 All the elements will have the same parent, and the given elements
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
472 will be immediately before this one.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
473
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parents:
diff changeset
474 :param args: One or more PageElements.
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parents:
diff changeset
475 """
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parents:
diff changeset
476 parent = self.parent
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parents:
diff changeset
477 if parent is None:
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parents:
diff changeset
478 raise ValueError(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
479 "Element has no parent, so 'before' has no meaning.")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
480 if any(x is self for x in args):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
481 raise ValueError("Can't insert an element before itself.")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
482 for predecessor in args:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
483 # Extract first so that the index won't be screwed up if they
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
484 # are siblings.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
485 if isinstance(predecessor, PageElement):
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parents:
diff changeset
486 predecessor.extract()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
487 index = parent.index(self)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
488 parent.insert(index, predecessor)
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parents:
diff changeset
489
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parents:
diff changeset
490 def insert_after(self, *args):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
491 """Makes the given element(s) the immediate successor of this one.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
492
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diff changeset
493 The elements will have the same parent, and the given elements
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
494 will be immediately after this one.
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parents:
diff changeset
495
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parents:
diff changeset
496 :param args: One or more PageElements.
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parents:
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497 """
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parents:
diff changeset
498 # Do all error checking before modifying the tree.
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parents:
diff changeset
499 parent = self.parent
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
500 if parent is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
501 raise ValueError(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
502 "Element has no parent, so 'after' has no meaning.")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
503 if any(x is self for x in args):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
504 raise ValueError("Can't insert an element after itself.")
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parents:
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505
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parents:
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506 offset = 0
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parents:
diff changeset
507 for successor in args:
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508 # Extract first so that the index won't be screwed up if they
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509 # are siblings.
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510 if isinstance(successor, PageElement):
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511 successor.extract()
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512 index = parent.index(self)
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513 parent.insert(index+1+offset, successor)
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514 offset += 1
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515
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516 def find_next(self, name=None, attrs={}, text=None, **kwargs):
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517 """Find the first PageElement that matches the given criteria and
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518 appears later in the document than this PageElement.
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519
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520 All find_* methods take a common set of arguments. See the online
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521 documentation for detailed explanations.
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522
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523 :param name: A filter on tag name.
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524 :param attrs: A dictionary of filters on attribute values.
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525 :param text: A filter for a NavigableString with specific text.
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526 :kwargs: A dictionary of filters on attribute values.
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527 :return: A PageElement.
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528 :rtype: bs4.element.Tag | bs4.element.NavigableString
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529 """
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530 return self._find_one(self.find_all_next, name, attrs, text, **kwargs)
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531 findNext = find_next # BS3
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532
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533 def find_all_next(self, name=None, attrs={}, text=None, limit=None,
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534 **kwargs):
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535 """Find all PageElements that match the given criteria and appear
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536 later in the document than this PageElement.
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537
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538 All find_* methods take a common set of arguments. See the online
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539 documentation for detailed explanations.
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540
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541 :param name: A filter on tag name.
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542 :param attrs: A dictionary of filters on attribute values.
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543 :param text: A filter for a NavigableString with specific text.
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544 :param limit: Stop looking after finding this many results.
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545 :kwargs: A dictionary of filters on attribute values.
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546 :return: A ResultSet containing PageElements.
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547 """
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548 return self._find_all(name, attrs, text, limit, self.next_elements,
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549 **kwargs)
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550 findAllNext = find_all_next # BS3
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551
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552 def find_next_sibling(self, name=None, attrs={}, text=None, **kwargs):
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553 """Find the closest sibling to this PageElement that matches the
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554 given criteria and appears later in the document.
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555
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556 All find_* methods take a common set of arguments. See the
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diff changeset
557 online documentation for detailed explanations.
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558
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559 :param name: A filter on tag name.
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560 :param attrs: A dictionary of filters on attribute values.
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561 :param text: A filter for a NavigableString with specific text.
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562 :kwargs: A dictionary of filters on attribute values.
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563 :return: A PageElement.
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564 :rtype: bs4.element.Tag | bs4.element.NavigableString
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565 """
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566 return self._find_one(self.find_next_siblings, name, attrs, text,
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567 **kwargs)
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568 findNextSibling = find_next_sibling # BS3
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569
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570 def find_next_siblings(self, name=None, attrs={}, text=None, limit=None,
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571 **kwargs):
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572 """Find all siblings of this PageElement that match the given criteria
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573 and appear later in the document.
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574
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575 All find_* methods take a common set of arguments. See the online
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576 documentation for detailed explanations.
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577
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578 :param name: A filter on tag name.
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579 :param attrs: A dictionary of filters on attribute values.
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580 :param text: A filter for a NavigableString with specific text.
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581 :param limit: Stop looking after finding this many results.
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582 :kwargs: A dictionary of filters on attribute values.
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583 :return: A ResultSet of PageElements.
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584 :rtype: bs4.element.ResultSet
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585 """
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586 return self._find_all(name, attrs, text, limit,
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587 self.next_siblings, **kwargs)
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588 findNextSiblings = find_next_siblings # BS3
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589 fetchNextSiblings = find_next_siblings # BS2
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590
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591 def find_previous(self, name=None, attrs={}, text=None, **kwargs):
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592 """Look backwards in the document from this PageElement and find the
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593 first PageElement that matches the given criteria.
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594
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595 All find_* methods take a common set of arguments. See the online
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596 documentation for detailed explanations.
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597
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598 :param name: A filter on tag name.
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599 :param attrs: A dictionary of filters on attribute values.
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600 :param text: A filter for a NavigableString with specific text.
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601 :kwargs: A dictionary of filters on attribute values.
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602 :return: A PageElement.
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603 :rtype: bs4.element.Tag | bs4.element.NavigableString
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604 """
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605 return self._find_one(
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606 self.find_all_previous, name, attrs, text, **kwargs)
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607 findPrevious = find_previous # BS3
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608
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609 def find_all_previous(self, name=None, attrs={}, text=None, limit=None,
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610 **kwargs):
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611 """Look backwards in the document from this PageElement and find all
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612 PageElements that match the given criteria.
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613
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614 All find_* methods take a common set of arguments. See the online
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615 documentation for detailed explanations.
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616
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617 :param name: A filter on tag name.
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618 :param attrs: A dictionary of filters on attribute values.
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619 :param text: A filter for a NavigableString with specific text.
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620 :param limit: Stop looking after finding this many results.
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621 :kwargs: A dictionary of filters on attribute values.
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622 :return: A ResultSet of PageElements.
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623 :rtype: bs4.element.ResultSet
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624 """
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625 return self._find_all(name, attrs, text, limit, self.previous_elements,
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626 **kwargs)
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627 findAllPrevious = find_all_previous # BS3
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628 fetchPrevious = find_all_previous # BS2
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629
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630 def find_previous_sibling(self, name=None, attrs={}, text=None, **kwargs):
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631 """Returns the closest sibling to this PageElement that matches the
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632 given criteria and appears earlier in the document.
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633
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634 All find_* methods take a common set of arguments. See the online
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diff changeset
635 documentation for detailed explanations.
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636
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637 :param name: A filter on tag name.
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638 :param attrs: A dictionary of filters on attribute values.
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639 :param text: A filter for a NavigableString with specific text.
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640 :kwargs: A dictionary of filters on attribute values.
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641 :return: A PageElement.
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642 :rtype: bs4.element.Tag | bs4.element.NavigableString
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643 """
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644 return self._find_one(self.find_previous_siblings, name, attrs, text,
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645 **kwargs)
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646 findPreviousSibling = find_previous_sibling # BS3
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647
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648 def find_previous_siblings(self, name=None, attrs={}, text=None,
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649 limit=None, **kwargs):
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650 """Returns all siblings to this PageElement that match the
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651 given criteria and appear earlier in the document.
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652
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653 All find_* methods take a common set of arguments. See the online
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diff changeset
654 documentation for detailed explanations.
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655
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656 :param name: A filter on tag name.
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657 :param attrs: A dictionary of filters on attribute values.
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658 :param text: A filter for a NavigableString with specific text.
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659 :param limit: Stop looking after finding this many results.
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660 :kwargs: A dictionary of filters on attribute values.
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661 :return: A ResultSet of PageElements.
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662 :rtype: bs4.element.ResultSet
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663 """
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664 return self._find_all(name, attrs, text, limit,
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665 self.previous_siblings, **kwargs)
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666 findPreviousSiblings = find_previous_siblings # BS3
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667 fetchPreviousSiblings = find_previous_siblings # BS2
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668
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669 def find_parent(self, name=None, attrs={}, **kwargs):
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670 """Find the closest parent of this PageElement that matches the given
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671 criteria.
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672
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673 All find_* methods take a common set of arguments. See the online
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674 documentation for detailed explanations.
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675
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676 :param name: A filter on tag name.
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677 :param attrs: A dictionary of filters on attribute values.
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678 :kwargs: A dictionary of filters on attribute values.
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679
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680 :return: A PageElement.
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681 :rtype: bs4.element.Tag | bs4.element.NavigableString
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682 """
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683 # NOTE: We can't use _find_one because findParents takes a different
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684 # set of arguments.
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685 r = None
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686 l = self.find_parents(name, attrs, 1, **kwargs)
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687 if l:
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diff changeset
688 r = l[0]
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689 return r
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690 findParent = find_parent # BS3
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diff changeset
691
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diff changeset
692 def find_parents(self, name=None, attrs={}, limit=None, **kwargs):
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diff changeset
693 """Find all parents of this PageElement that match the given criteria.
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diff changeset
694
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parents:
diff changeset
695 All find_* methods take a common set of arguments. See the online
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diff changeset
696 documentation for detailed explanations.
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697
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diff changeset
698 :param name: A filter on tag name.
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diff changeset
699 :param attrs: A dictionary of filters on attribute values.
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700 :param limit: Stop looking after finding this many results.
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parents:
diff changeset
701 :kwargs: A dictionary of filters on attribute values.
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parents:
diff changeset
702
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parents:
diff changeset
703 :return: A PageElement.
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parents:
diff changeset
704 :rtype: bs4.element.Tag | bs4.element.NavigableString
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705 """
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parents:
diff changeset
706 return self._find_all(name, attrs, None, limit, self.parents,
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diff changeset
707 **kwargs)
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parents:
diff changeset
708 findParents = find_parents # BS3
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diff changeset
709 fetchParents = find_parents # BS2
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parents:
diff changeset
710
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parents:
diff changeset
711 @property
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parents:
diff changeset
712 def next(self):
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parents:
diff changeset
713 """The PageElement, if any, that was parsed just after this one.
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parents:
diff changeset
714
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parents:
diff changeset
715 :return: A PageElement.
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parents:
diff changeset
716 :rtype: bs4.element.Tag | bs4.element.NavigableString
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diff changeset
717 """
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parents:
diff changeset
718 return self.next_element
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parents:
diff changeset
719
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parents:
diff changeset
720 @property
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parents:
diff changeset
721 def previous(self):
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parents:
diff changeset
722 """The PageElement, if any, that was parsed just before this one.
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parents:
diff changeset
723
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diff changeset
724 :return: A PageElement.
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parents:
diff changeset
725 :rtype: bs4.element.Tag | bs4.element.NavigableString
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diff changeset
726 """
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parents:
diff changeset
727 return self.previous_element
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parents:
diff changeset
728
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parents:
diff changeset
729 #These methods do the real heavy lifting.
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parents:
diff changeset
730
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diff changeset
731 def _find_one(self, method, name, attrs, text, **kwargs):
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diff changeset
732 r = None
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diff changeset
733 l = method(name, attrs, text, 1, **kwargs)
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parents:
diff changeset
734 if l:
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diff changeset
735 r = l[0]
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diff changeset
736 return r
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diff changeset
737
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diff changeset
738 def _find_all(self, name, attrs, text, limit, generator, **kwargs):
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parents:
diff changeset
739 "Iterates over a generator looking for things that match."
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parents:
diff changeset
740
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diff changeset
741 if text is None and 'string' in kwargs:
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parents:
diff changeset
742 text = kwargs['string']
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parents:
diff changeset
743 del kwargs['string']
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diff changeset
744
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diff changeset
745 if isinstance(name, SoupStrainer):
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diff changeset
746 strainer = name
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diff changeset
747 else:
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diff changeset
748 strainer = SoupStrainer(name, attrs, text, **kwargs)
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diff changeset
749
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750 if text is None and not limit and not attrs and not kwargs:
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diff changeset
751 if name is True or name is None:
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parents:
diff changeset
752 # Optimization to find all tags.
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diff changeset
753 result = (element for element in generator
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754 if isinstance(element, Tag))
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diff changeset
755 return ResultSet(strainer, result)
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diff changeset
756 elif isinstance(name, str):
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diff changeset
757 # Optimization to find all tags with a given name.
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diff changeset
758 if name.count(':') == 1:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
759 # This is a name with a prefix. If this is a namespace-aware document,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
760 # we need to match the local name against tag.name. If not,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
761 # we need to match the fully-qualified name against tag.name.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
762 prefix, local_name = name.split(':', 1)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
763 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
764 prefix = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
765 local_name = name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
766 result = (element for element in generator
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
767 if isinstance(element, Tag)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
768 and (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
769 element.name == name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
770 ) or (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
771 element.name == local_name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
772 and (prefix is None or element.prefix == prefix)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
773 )
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
774 )
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
775 return ResultSet(strainer, result)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
776 results = ResultSet(strainer)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
777 while True:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
778 try:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
779 i = next(generator)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
780 except StopIteration:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
781 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
782 if i:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
783 found = strainer.search(i)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
784 if found:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
785 results.append(found)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
786 if limit and len(results) >= limit:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
787 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
788 return results
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
789
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
790 #These generators can be used to navigate starting from both
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
791 #NavigableStrings and Tags.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
792 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
793 def next_elements(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
794 """All PageElements that were parsed after this one.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
795
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
796 :yield: A sequence of PageElements.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
797 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
798 i = self.next_element
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
799 while i is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
800 yield i
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
801 i = i.next_element
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
802
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
803 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
804 def next_siblings(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
805 """All PageElements that are siblings of this one but were parsed
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
806 later.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
807
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
808 :yield: A sequence of PageElements.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
809 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
810 i = self.next_sibling
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
811 while i is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
812 yield i
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
813 i = i.next_sibling
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
814
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
815 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
816 def previous_elements(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
817 """All PageElements that were parsed before this one.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
818
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
819 :yield: A sequence of PageElements.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
820 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
821 i = self.previous_element
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
822 while i is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
823 yield i
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
824 i = i.previous_element
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
825
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
826 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
827 def previous_siblings(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
828 """All PageElements that are siblings of this one but were parsed
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
829 earlier.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
830
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
831 :yield: A sequence of PageElements.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
832 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
833 i = self.previous_sibling
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
834 while i is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
835 yield i
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
836 i = i.previous_sibling
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
837
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
838 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
839 def parents(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
840 """All PageElements that are parents of this PageElement.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
841
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
842 :yield: A sequence of PageElements.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
843 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
844 i = self.parent
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
845 while i is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
846 yield i
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
847 i = i.parent
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
848
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
849 @property
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
850 def decomposed(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
851 """Check whether a PageElement has been decomposed.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
852
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
853 :rtype: bool
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
854 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
855 return getattr(self, '_decomposed', False) or False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
856
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
857 # Old non-property versions of the generators, for backwards
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
858 # compatibility with BS3.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
859 def nextGenerator(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
860 return self.next_elements
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
861
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
862 def nextSiblingGenerator(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
863 return self.next_siblings
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
864
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
865 def previousGenerator(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
866 return self.previous_elements
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
867
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
868 def previousSiblingGenerator(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
869 return self.previous_siblings
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
870
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
871 def parentGenerator(self):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
872 return self.parents
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
873
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
874
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
875 class NavigableString(str, PageElement):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
876 """A Python Unicode string that is part of a parse tree.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
877
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
878 When Beautiful Soup parses the markup <b>penguin</b>, it will
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
879 create a NavigableString for the string "penguin".
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
880 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
881
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
882 PREFIX = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
883 SUFFIX = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
884
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
885 # We can't tell just by looking at a string whether it's contained
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
886 # in an XML document or an HTML document.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
887
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
888 known_xml = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
889
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
890 def __new__(cls, value):
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parents:
diff changeset
891 """Create a new NavigableString.
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parents:
diff changeset
892
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parents:
diff changeset
893 When unpickling a NavigableString, this method is called with
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parents:
diff changeset
894 the string in DEFAULT_OUTPUT_ENCODING. That encoding needs to be
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parents:
diff changeset
895 passed in to the superclass's __new__ or the superclass won't know
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parents:
diff changeset
896 how to handle non-ASCII characters.
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parents:
diff changeset
897 """
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parents:
diff changeset
898 if isinstance(value, str):
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parents:
diff changeset
899 u = str.__new__(cls, value)
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parents:
diff changeset
900 else:
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parents:
diff changeset
901 u = str.__new__(cls, value, DEFAULT_OUTPUT_ENCODING)
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parents:
diff changeset
902 u.setup()
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parents:
diff changeset
903 return u
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parents:
diff changeset
904
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parents:
diff changeset
905 def __copy__(self):
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parents:
diff changeset
906 """A copy of a NavigableString has the same contents and class
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parents:
diff changeset
907 as the original, but it is not connected to the parse tree.
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parents:
diff changeset
908 """
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parents:
diff changeset
909 return type(self)(self)
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parents:
diff changeset
910
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parents:
diff changeset
911 def __getnewargs__(self):
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parents:
diff changeset
912 return (str(self),)
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parents:
diff changeset
913
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parents:
diff changeset
914 def __getattr__(self, attr):
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parents:
diff changeset
915 """text.string gives you text. This is for backwards
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parents:
diff changeset
916 compatibility for Navigable*String, but for CData* it lets you
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shellac
parents:
diff changeset
917 get the string without the CData wrapper."""
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parents:
diff changeset
918 if attr == 'string':
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parents:
diff changeset
919 return self
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parents:
diff changeset
920 else:
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parents:
diff changeset
921 raise AttributeError(
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parents:
diff changeset
922 "'%s' object has no attribute '%s'" % (
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parents:
diff changeset
923 self.__class__.__name__, attr))
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parents:
diff changeset
924
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parents:
diff changeset
925 def output_ready(self, formatter="minimal"):
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shellac
parents:
diff changeset
926 """Run the string through the provided formatter.
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parents:
diff changeset
927
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parents:
diff changeset
928 :param formatter: A Formatter object, or a string naming one of the standard formatters.
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parents:
diff changeset
929 """
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parents:
diff changeset
930 output = self.format_string(self, formatter)
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parents:
diff changeset
931 return self.PREFIX + output + self.SUFFIX
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parents:
diff changeset
932
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parents:
diff changeset
933 @property
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parents:
diff changeset
934 def name(self):
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parents:
diff changeset
935 """Since a NavigableString is not a Tag, it has no .name.
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parents:
diff changeset
936
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shellac
parents:
diff changeset
937 This property is implemented so that code like this doesn't crash
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shellac
parents:
diff changeset
938 when run on a mixture of Tag and NavigableString objects:
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shellac
parents:
diff changeset
939 [x.name for x in tag.children]
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parents:
diff changeset
940 """
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shellac
parents:
diff changeset
941 return None
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parents:
diff changeset
942
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shellac
parents:
diff changeset
943 @name.setter
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parents:
diff changeset
944 def name(self, name):
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parents:
diff changeset
945 """Prevent NavigableString.name from ever being set."""
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parents:
diff changeset
946 raise AttributeError("A NavigableString cannot be given a name.")
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parents:
diff changeset
947
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parents:
diff changeset
948
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parents:
diff changeset
949 class PreformattedString(NavigableString):
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parents:
diff changeset
950 """A NavigableString not subject to the normal formatting rules.
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parents:
diff changeset
951
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parents:
diff changeset
952 This is an abstract class used for special kinds of strings such
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shellac
parents:
diff changeset
953 as comments (the Comment class) and CDATA blocks (the CData
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parents:
diff changeset
954 class).
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parents:
diff changeset
955 """
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parents:
diff changeset
956
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parents:
diff changeset
957 PREFIX = ''
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parents:
diff changeset
958 SUFFIX = ''
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parents:
diff changeset
959
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parents:
diff changeset
960 def output_ready(self, formatter=None):
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parents:
diff changeset
961 """Make this string ready for output by adding any subclass-specific
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parents:
diff changeset
962 prefix or suffix.
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parents:
diff changeset
963
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parents:
diff changeset
964 :param formatter: A Formatter object, or a string naming one
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shellac
parents:
diff changeset
965 of the standard formatters. The string will be passed into the
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shellac
parents:
diff changeset
966 Formatter, but only to trigger any side effects: the return
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shellac
parents:
diff changeset
967 value is ignored.
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parents:
diff changeset
968
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parents:
diff changeset
969 :return: The string, with any subclass-specific prefix and
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parents:
diff changeset
970 suffix added on.
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parents:
diff changeset
971 """
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parents:
diff changeset
972 if formatter is not None:
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parents:
diff changeset
973 ignore = self.format_string(self, formatter)
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parents:
diff changeset
974 return self.PREFIX + self + self.SUFFIX
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parents:
diff changeset
975
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parents:
diff changeset
976 class CData(PreformattedString):
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parents:
diff changeset
977 """A CDATA block."""
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parents:
diff changeset
978 PREFIX = '<![CDATA['
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parents:
diff changeset
979 SUFFIX = ']]>'
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parents:
diff changeset
980
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parents:
diff changeset
981 class ProcessingInstruction(PreformattedString):
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parents:
diff changeset
982 """A SGML processing instruction."""
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parents:
diff changeset
983
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parents:
diff changeset
984 PREFIX = '<?'
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parents:
diff changeset
985 SUFFIX = '>'
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parents:
diff changeset
986
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parents:
diff changeset
987 class XMLProcessingInstruction(ProcessingInstruction):
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parents:
diff changeset
988 """An XML processing instruction."""
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parents:
diff changeset
989 PREFIX = '<?'
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parents:
diff changeset
990 SUFFIX = '?>'
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parents:
diff changeset
991
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parents:
diff changeset
992 class Comment(PreformattedString):
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parents:
diff changeset
993 """An HTML or XML comment."""
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parents:
diff changeset
994 PREFIX = '<!--'
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parents:
diff changeset
995 SUFFIX = '-->'
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parents:
diff changeset
996
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parents:
diff changeset
997
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parents:
diff changeset
998 class Declaration(PreformattedString):
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parents:
diff changeset
999 """An XML declaration."""
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parents:
diff changeset
1000 PREFIX = '<?'
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parents:
diff changeset
1001 SUFFIX = '?>'
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parents:
diff changeset
1002
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parents:
diff changeset
1003
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parents:
diff changeset
1004 class Doctype(PreformattedString):
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shellac
parents:
diff changeset
1005 """A document type declaration."""
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parents:
diff changeset
1006 @classmethod
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parents:
diff changeset
1007 def for_name_and_ids(cls, name, pub_id, system_id):
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shellac
parents:
diff changeset
1008 """Generate an appropriate document type declaration for a given
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parents:
diff changeset
1009 public ID and system ID.
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parents:
diff changeset
1010
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parents:
diff changeset
1011 :param name: The name of the document's root element, e.g. 'html'.
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parents:
diff changeset
1012 :param pub_id: The Formal Public Identifier for this document type,
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parents:
diff changeset
1013 e.g. '-//W3C//DTD XHTML 1.1//EN'
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parents:
diff changeset
1014 :param system_id: The system identifier for this document type,
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parents:
diff changeset
1015 e.g. 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd'
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parents:
diff changeset
1016
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parents:
diff changeset
1017 :return: A Doctype.
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parents:
diff changeset
1018 """
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shellac
parents:
diff changeset
1019 value = name or ''
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shellac
parents:
diff changeset
1020 if pub_id is not None:
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shellac
parents:
diff changeset
1021 value += ' PUBLIC "%s"' % pub_id
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shellac
parents:
diff changeset
1022 if system_id is not None:
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shellac
parents:
diff changeset
1023 value += ' "%s"' % system_id
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shellac
parents:
diff changeset
1024 elif system_id is not None:
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shellac
parents:
diff changeset
1025 value += ' SYSTEM "%s"' % system_id
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shellac
parents:
diff changeset
1026
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shellac
parents:
diff changeset
1027 return Doctype(value)
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shellac
parents:
diff changeset
1028
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shellac
parents:
diff changeset
1029 PREFIX = '<!DOCTYPE '
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1030 SUFFIX = '>\n'
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shellac
parents:
diff changeset
1031
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shellac
parents:
diff changeset
1032
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shellac
parents:
diff changeset
1033 class Stylesheet(NavigableString):
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shellac
parents:
diff changeset
1034 """A NavigableString representing an stylesheet (probably
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1035 CSS).
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shellac
parents:
diff changeset
1036
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shellac
parents:
diff changeset
1037 Used to distinguish embedded stylesheets from textual content.
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shellac
parents:
diff changeset
1038 """
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shellac
parents:
diff changeset
1039 pass
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shellac
parents:
diff changeset
1040
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shellac
parents:
diff changeset
1041
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shellac
parents:
diff changeset
1042 class Script(NavigableString):
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shellac
parents:
diff changeset
1043 """A NavigableString representing an executable script (probably
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shellac
parents:
diff changeset
1044 Javascript).
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shellac
parents:
diff changeset
1045
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shellac
parents:
diff changeset
1046 Used to distinguish executable code from textual content.
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shellac
parents:
diff changeset
1047 """
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shellac
parents:
diff changeset
1048 pass
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shellac
parents:
diff changeset
1049
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shellac
parents:
diff changeset
1050
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shellac
parents:
diff changeset
1051 class TemplateString(NavigableString):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1052 """A NavigableString representing a string found inside an HTML
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shellac
parents:
diff changeset
1053 template embedded in a larger document.
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shellac
parents:
diff changeset
1054
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shellac
parents:
diff changeset
1055 Used to distinguish such strings from the main body of the document.
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shellac
parents:
diff changeset
1056 """
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shellac
parents:
diff changeset
1057 pass
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shellac
parents:
diff changeset
1058
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shellac
parents:
diff changeset
1059
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shellac
parents:
diff changeset
1060 class Tag(PageElement):
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shellac
parents:
diff changeset
1061 """Represents an HTML or XML tag that is part of a parse tree, along
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shellac
parents:
diff changeset
1062 with its attributes and contents.
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shellac
parents:
diff changeset
1063
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shellac
parents:
diff changeset
1064 When Beautiful Soup parses the markup <b>penguin</b>, it will
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1065 create a Tag object representing the <b> tag.
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shellac
parents:
diff changeset
1066 """
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shellac
parents:
diff changeset
1067
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shellac
parents:
diff changeset
1068 def __init__(self, parser=None, builder=None, name=None, namespace=None,
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shellac
parents:
diff changeset
1069 prefix=None, attrs=None, parent=None, previous=None,
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shellac
parents:
diff changeset
1070 is_xml=None, sourceline=None, sourcepos=None,
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shellac
parents:
diff changeset
1071 can_be_empty_element=None, cdata_list_attributes=None,
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shellac
parents:
diff changeset
1072 preserve_whitespace_tags=None
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shellac
parents:
diff changeset
1073 ):
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shellac
parents:
diff changeset
1074 """Basic constructor.
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shellac
parents:
diff changeset
1075
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parents:
diff changeset
1076 :param parser: A BeautifulSoup object.
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shellac
parents:
diff changeset
1077 :param builder: A TreeBuilder.
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shellac
parents:
diff changeset
1078 :param name: The name of the tag.
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shellac
parents:
diff changeset
1079 :param namespace: The URI of this Tag's XML namespace, if any.
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shellac
parents:
diff changeset
1080 :param prefix: The prefix for this Tag's XML namespace, if any.
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shellac
parents:
diff changeset
1081 :param attrs: A dictionary of this Tag's attribute values.
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shellac
parents:
diff changeset
1082 :param parent: The PageElement to use as this Tag's parent.
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shellac
parents:
diff changeset
1083 :param previous: The PageElement that was parsed immediately before
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shellac
parents:
diff changeset
1084 this tag.
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shellac
parents:
diff changeset
1085 :param is_xml: If True, this is an XML tag. Otherwise, this is an
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1086 HTML tag.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1087 :param sourceline: The line number where this tag was found in its
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1088 source document.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1089 :param sourcepos: The character position within `sourceline` where this
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1090 tag was found.
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shellac
parents:
diff changeset
1091 :param can_be_empty_element: If True, this tag should be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1092 represented as <tag/>. If False, this tag should be represented
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1093 as <tag></tag>.
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shellac
parents:
diff changeset
1094 :param cdata_list_attributes: A list of attributes whose values should
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1095 be treated as CDATA if they ever show up on this tag.
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shellac
parents:
diff changeset
1096 :param preserve_whitespace_tags: A list of tag names whose contents
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shellac
parents:
diff changeset
1097 should have their whitespace preserved.
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shellac
parents:
diff changeset
1098 """
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shellac
parents:
diff changeset
1099 if parser is None:
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parents:
diff changeset
1100 self.parser_class = None
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parents:
diff changeset
1101 else:
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parents:
diff changeset
1102 # We don't actually store the parser object: that lets extracted
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1103 # chunks be garbage-collected.
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shellac
parents:
diff changeset
1104 self.parser_class = parser.__class__
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1105 if name is None:
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shellac
parents:
diff changeset
1106 raise ValueError("No value provided for new tag's name.")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1107 self.name = name
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parents:
diff changeset
1108 self.namespace = namespace
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parents:
diff changeset
1109 self.prefix = prefix
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parents:
diff changeset
1110 if ((not builder or builder.store_line_numbers)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1111 and (sourceline is not None or sourcepos is not None)):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1112 self.sourceline = sourceline
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shellac
parents:
diff changeset
1113 self.sourcepos = sourcepos
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parents:
diff changeset
1114 if attrs is None:
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shellac
parents:
diff changeset
1115 attrs = {}
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parents:
diff changeset
1116 elif attrs:
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parents:
diff changeset
1117 if builder is not None and builder.cdata_list_attributes:
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shellac
parents:
diff changeset
1118 attrs = builder._replace_cdata_list_attribute_values(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1119 self.name, attrs)
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parents:
diff changeset
1120 else:
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parents:
diff changeset
1121 attrs = dict(attrs)
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parents:
diff changeset
1122 else:
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parents:
diff changeset
1123 attrs = dict(attrs)
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parents:
diff changeset
1124
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parents:
diff changeset
1125 # If possible, determine ahead of time whether this tag is an
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shellac
parents:
diff changeset
1126 # XML tag.
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parents:
diff changeset
1127 if builder:
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parents:
diff changeset
1128 self.known_xml = builder.is_xml
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parents:
diff changeset
1129 else:
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parents:
diff changeset
1130 self.known_xml = is_xml
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parents:
diff changeset
1131 self.attrs = attrs
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parents:
diff changeset
1132 self.contents = []
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parents:
diff changeset
1133 self.setup(parent, previous)
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parents:
diff changeset
1134 self.hidden = False
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parents:
diff changeset
1135
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parents:
diff changeset
1136 if builder is None:
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shellac
parents:
diff changeset
1137 # In the absence of a TreeBuilder, use whatever values were
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shellac
parents:
diff changeset
1138 # passed in here. They're probably None, unless this is a copy of some
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shellac
parents:
diff changeset
1139 # other tag.
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parents:
diff changeset
1140 self.can_be_empty_element = can_be_empty_element
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shellac
parents:
diff changeset
1141 self.cdata_list_attributes = cdata_list_attributes
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shellac
parents:
diff changeset
1142 self.preserve_whitespace_tags = preserve_whitespace_tags
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parents:
diff changeset
1143 else:
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shellac
parents:
diff changeset
1144 # Set up any substitutions for this tag, such as the charset in a META tag.
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parents:
diff changeset
1145 builder.set_up_substitutions(self)
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parents:
diff changeset
1146
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parents:
diff changeset
1147 # Ask the TreeBuilder whether this tag might be an empty-element tag.
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parents:
diff changeset
1148 self.can_be_empty_element = builder.can_be_empty_element(name)
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parents:
diff changeset
1149
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parents:
diff changeset
1150 # Keep track of the list of attributes of this tag that
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parents:
diff changeset
1151 # might need to be treated as a list.
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parents:
diff changeset
1152 #
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parents:
diff changeset
1153 # For performance reasons, we store the whole data structure
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parents:
diff changeset
1154 # rather than asking the question of every tag. Asking would
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shellac
parents:
diff changeset
1155 # require building a new data structure every time, and
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parents:
diff changeset
1156 # (unlike can_be_empty_element), we almost never need
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parents:
diff changeset
1157 # to check this.
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parents:
diff changeset
1158 self.cdata_list_attributes = builder.cdata_list_attributes
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parents:
diff changeset
1159
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parents:
diff changeset
1160 # Keep track of the names that might cause this tag to be treated as a
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parents:
diff changeset
1161 # whitespace-preserved tag.
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parents:
diff changeset
1162 self.preserve_whitespace_tags = builder.preserve_whitespace_tags
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parents:
diff changeset
1163
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parents:
diff changeset
1164 parserClass = _alias("parser_class") # BS3
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parents:
diff changeset
1165
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parents:
diff changeset
1166 def __copy__(self):
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parents:
diff changeset
1167 """A copy of a Tag is a new Tag, unconnected to the parse tree.
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parents:
diff changeset
1168 Its contents are a copy of the old Tag's contents.
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parents:
diff changeset
1169 """
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parents:
diff changeset
1170 clone = type(self)(
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parents:
diff changeset
1171 None, self.builder, self.name, self.namespace,
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parents:
diff changeset
1172 self.prefix, self.attrs, is_xml=self._is_xml,
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parents:
diff changeset
1173 sourceline=self.sourceline, sourcepos=self.sourcepos,
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parents:
diff changeset
1174 can_be_empty_element=self.can_be_empty_element,
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parents:
diff changeset
1175 cdata_list_attributes=self.cdata_list_attributes,
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parents:
diff changeset
1176 preserve_whitespace_tags=self.preserve_whitespace_tags
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parents:
diff changeset
1177 )
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parents:
diff changeset
1178 for attr in ('can_be_empty_element', 'hidden'):
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parents:
diff changeset
1179 setattr(clone, attr, getattr(self, attr))
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parents:
diff changeset
1180 for child in self.contents:
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parents:
diff changeset
1181 clone.append(child.__copy__())
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parents:
diff changeset
1182 return clone
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parents:
diff changeset
1183
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parents:
diff changeset
1184 @property
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parents:
diff changeset
1185 def is_empty_element(self):
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parents:
diff changeset
1186 """Is this tag an empty-element tag? (aka a self-closing tag)
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parents:
diff changeset
1187
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parents:
diff changeset
1188 A tag that has contents is never an empty-element tag.
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parents:
diff changeset
1189
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parents:
diff changeset
1190 A tag that has no contents may or may not be an empty-element
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parents:
diff changeset
1191 tag. It depends on the builder used to create the tag. If the
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parents:
diff changeset
1192 builder has a designated list of empty-element tags, then only
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parents:
diff changeset
1193 a tag whose name shows up in that list is considered an
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parents:
diff changeset
1194 empty-element tag.
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parents:
diff changeset
1195
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parents:
diff changeset
1196 If the builder has no designated list of empty-element tags,
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parents:
diff changeset
1197 then any tag with no contents is an empty-element tag.
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parents:
diff changeset
1198 """
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parents:
diff changeset
1199 return len(self.contents) == 0 and self.can_be_empty_element
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parents:
diff changeset
1200 isSelfClosing = is_empty_element # BS3
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parents:
diff changeset
1201
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parents:
diff changeset
1202 @property
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parents:
diff changeset
1203 def string(self):
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parents:
diff changeset
1204 """Convenience property to get the single string within this
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shellac
parents:
diff changeset
1205 PageElement.
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parents:
diff changeset
1206
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parents:
diff changeset
1207 TODO It might make sense to have NavigableString.string return
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parents:
diff changeset
1208 itself.
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parents:
diff changeset
1209
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parents:
diff changeset
1210 :return: If this element has a single string child, return
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shellac
parents:
diff changeset
1211 value is that string. If this element has one child tag,
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shellac
parents:
diff changeset
1212 return value is the 'string' attribute of the child tag,
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shellac
parents:
diff changeset
1213 recursively. If this element is itself a string, has no
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shellac
parents:
diff changeset
1214 children, or has more than one child, return value is None.
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shellac
parents:
diff changeset
1215 """
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shellac
parents:
diff changeset
1216 if len(self.contents) != 1:
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shellac
parents:
diff changeset
1217 return None
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shellac
parents:
diff changeset
1218 child = self.contents[0]
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shellac
parents:
diff changeset
1219 if isinstance(child, NavigableString):
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shellac
parents:
diff changeset
1220 return child
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shellac
parents:
diff changeset
1221 return child.string
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shellac
parents:
diff changeset
1222
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shellac
parents:
diff changeset
1223 @string.setter
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shellac
parents:
diff changeset
1224 def string(self, string):
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shellac
parents:
diff changeset
1225 """Replace this PageElement's contents with `string`."""
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shellac
parents:
diff changeset
1226 self.clear()
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shellac
parents:
diff changeset
1227 self.append(string.__class__(string))
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shellac
parents:
diff changeset
1228
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shellac
parents:
diff changeset
1229 def _all_strings(self, strip=False, types=(NavigableString, CData)):
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shellac
parents:
diff changeset
1230 """Yield all strings of certain classes, possibly stripping them.
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shellac
parents:
diff changeset
1231
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shellac
parents:
diff changeset
1232 :param strip: If True, all strings will be stripped before being
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shellac
parents:
diff changeset
1233 yielded.
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shellac
parents:
diff changeset
1234
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shellac
parents:
diff changeset
1235 :types: A tuple of NavigableString subclasses. Any strings of
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shellac
parents:
diff changeset
1236 a subclass not found in this list will be ignored. By
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shellac
parents:
diff changeset
1237 default, this means only NavigableString and CData objects
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shellac
parents:
diff changeset
1238 will be considered. So no comments, processing instructions,
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shellac
parents:
diff changeset
1239 etc.
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shellac
parents:
diff changeset
1240
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shellac
parents:
diff changeset
1241 :yield: A sequence of strings.
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shellac
parents:
diff changeset
1242 """
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shellac
parents:
diff changeset
1243 for descendant in self.descendants:
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shellac
parents:
diff changeset
1244 if (
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shellac
parents:
diff changeset
1245 (types is None and not isinstance(descendant, NavigableString))
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shellac
parents:
diff changeset
1246 or
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shellac
parents:
diff changeset
1247 (types is not None and type(descendant) not in types)):
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shellac
parents:
diff changeset
1248 continue
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shellac
parents:
diff changeset
1249 if strip:
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shellac
parents:
diff changeset
1250 descendant = descendant.strip()
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shellac
parents:
diff changeset
1251 if len(descendant) == 0:
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shellac
parents:
diff changeset
1252 continue
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shellac
parents:
diff changeset
1253 yield descendant
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shellac
parents:
diff changeset
1254
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shellac
parents:
diff changeset
1255 strings = property(_all_strings)
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shellac
parents:
diff changeset
1256
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shellac
parents:
diff changeset
1257 @property
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shellac
parents:
diff changeset
1258 def stripped_strings(self):
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shellac
parents:
diff changeset
1259 """Yield all strings in the document, stripping them first.
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shellac
parents:
diff changeset
1260
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shellac
parents:
diff changeset
1261 :yield: A sequence of stripped strings.
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shellac
parents:
diff changeset
1262 """
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shellac
parents:
diff changeset
1263 for string in self._all_strings(True):
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shellac
parents:
diff changeset
1264 yield string
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shellac
parents:
diff changeset
1265
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shellac
parents:
diff changeset
1266 def get_text(self, separator="", strip=False,
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shellac
parents:
diff changeset
1267 types=(NavigableString, CData)):
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shellac
parents:
diff changeset
1268 """Get all child strings, concatenated using the given separator.
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shellac
parents:
diff changeset
1269
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shellac
parents:
diff changeset
1270 :param separator: Strings will be concatenated using this separator.
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shellac
parents:
diff changeset
1271
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shellac
parents:
diff changeset
1272 :param strip: If True, strings will be stripped before being
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shellac
parents:
diff changeset
1273 concatenated.
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shellac
parents:
diff changeset
1274
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shellac
parents:
diff changeset
1275 :types: A tuple of NavigableString subclasses. Any strings of
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shellac
parents:
diff changeset
1276 a subclass not found in this list will be ignored. By
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shellac
parents:
diff changeset
1277 default, this means only NavigableString and CData objects
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shellac
parents:
diff changeset
1278 will be considered. So no comments, processing instructions,
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shellac
parents:
diff changeset
1279 stylesheets, etc.
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shellac
parents:
diff changeset
1280
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shellac
parents:
diff changeset
1281 :return: A string.
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shellac
parents:
diff changeset
1282 """
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shellac
parents:
diff changeset
1283 return separator.join([s for s in self._all_strings(
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shellac
parents:
diff changeset
1284 strip, types=types)])
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shellac
parents:
diff changeset
1285 getText = get_text
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shellac
parents:
diff changeset
1286 text = property(get_text)
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shellac
parents:
diff changeset
1287
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shellac
parents:
diff changeset
1288 def decompose(self):
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shellac
parents:
diff changeset
1289 """Recursively destroys this PageElement and its children.
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shellac
parents:
diff changeset
1290
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shellac
parents:
diff changeset
1291 This element will be removed from the tree and wiped out; so
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shellac
parents:
diff changeset
1292 will everything beneath it.
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parents:
diff changeset
1293
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parents:
diff changeset
1294 The behavior of a decomposed PageElement is undefined and you
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shellac
parents:
diff changeset
1295 should never use one for anything, but if you need to _check_
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shellac
parents:
diff changeset
1296 whether an element has been decomposed, you can use the
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shellac
parents:
diff changeset
1297 `decomposed` property.
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parents:
diff changeset
1298 """
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shellac
parents:
diff changeset
1299 self.extract()
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parents:
diff changeset
1300 i = self
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parents:
diff changeset
1301 while i is not None:
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parents:
diff changeset
1302 n = i.next_element
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parents:
diff changeset
1303 i.__dict__.clear()
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shellac
parents:
diff changeset
1304 i.contents = []
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parents:
diff changeset
1305 i._decomposed = True
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parents:
diff changeset
1306 i = n
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parents:
diff changeset
1307
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parents:
diff changeset
1308 def clear(self, decompose=False):
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shellac
parents:
diff changeset
1309 """Wipe out all children of this PageElement by calling extract()
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parents:
diff changeset
1310 on them.
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parents:
diff changeset
1311
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parents:
diff changeset
1312 :param decompose: If this is True, decompose() (a more
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parents:
diff changeset
1313 destructive method) will be called instead of extract().
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parents:
diff changeset
1314 """
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parents:
diff changeset
1315 if decompose:
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parents:
diff changeset
1316 for element in self.contents[:]:
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parents:
diff changeset
1317 if isinstance(element, Tag):
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shellac
parents:
diff changeset
1318 element.decompose()
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parents:
diff changeset
1319 else:
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parents:
diff changeset
1320 element.extract()
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parents:
diff changeset
1321 else:
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shellac
parents:
diff changeset
1322 for element in self.contents[:]:
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shellac
parents:
diff changeset
1323 element.extract()
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parents:
diff changeset
1324
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parents:
diff changeset
1325 def smooth(self):
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parents:
diff changeset
1326 """Smooth out this element's children by consolidating consecutive
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shellac
parents:
diff changeset
1327 strings.
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shellac
parents:
diff changeset
1328
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shellac
parents:
diff changeset
1329 This makes pretty-printed output look more natural following a
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shellac
parents:
diff changeset
1330 lot of operations that modified the tree.
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shellac
parents:
diff changeset
1331 """
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shellac
parents:
diff changeset
1332 # Mark the first position of every pair of children that need
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shellac
parents:
diff changeset
1333 # to be consolidated. Do this rather than making a copy of
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shellac
parents:
diff changeset
1334 # self.contents, since in most cases very few strings will be
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shellac
parents:
diff changeset
1335 # affected.
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parents:
diff changeset
1336 marked = []
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parents:
diff changeset
1337 for i, a in enumerate(self.contents):
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shellac
parents:
diff changeset
1338 if isinstance(a, Tag):
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shellac
parents:
diff changeset
1339 # Recursively smooth children.
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shellac
parents:
diff changeset
1340 a.smooth()
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shellac
parents:
diff changeset
1341 if i == len(self.contents)-1:
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shellac
parents:
diff changeset
1342 # This is the last item in .contents, and it's not a
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shellac
parents:
diff changeset
1343 # tag. There's no chance it needs any work.
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shellac
parents:
diff changeset
1344 continue
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shellac
parents:
diff changeset
1345 b = self.contents[i+1]
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shellac
parents:
diff changeset
1346 if (isinstance(a, NavigableString)
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shellac
parents:
diff changeset
1347 and isinstance(b, NavigableString)
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shellac
parents:
diff changeset
1348 and not isinstance(a, PreformattedString)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1349 and not isinstance(b, PreformattedString)
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shellac
parents:
diff changeset
1350 ):
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shellac
parents:
diff changeset
1351 marked.append(i)
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parents:
diff changeset
1352
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shellac
parents:
diff changeset
1353 # Go over the marked positions in reverse order, so that
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1354 # removing items from .contents won't affect the remaining
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shellac
parents:
diff changeset
1355 # positions.
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shellac
parents:
diff changeset
1356 for i in reversed(marked):
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shellac
parents:
diff changeset
1357 a = self.contents[i]
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1358 b = self.contents[i+1]
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1359 b.extract()
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shellac
parents:
diff changeset
1360 n = NavigableString(a+b)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1361 a.replace_with(n)
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shellac
parents:
diff changeset
1362
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shellac
parents:
diff changeset
1363 def index(self, element):
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shellac
parents:
diff changeset
1364 """Find the index of a child by identity, not value.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1365
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1366 Avoids issues with tag.contents.index(element) getting the
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1367 index of equal elements.
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shellac
parents:
diff changeset
1368
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shellac
parents:
diff changeset
1369 :param element: Look for this PageElement in `self.contents`.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1370 """
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shellac
parents:
diff changeset
1371 for i, child in enumerate(self.contents):
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shellac
parents:
diff changeset
1372 if child is element:
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shellac
parents:
diff changeset
1373 return i
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shellac
parents:
diff changeset
1374 raise ValueError("Tag.index: element not in tag")
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shellac
parents:
diff changeset
1375
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shellac
parents:
diff changeset
1376 def get(self, key, default=None):
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shellac
parents:
diff changeset
1377 """Returns the value of the 'key' attribute for the tag, or
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1378 the value given for 'default' if it doesn't have that
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shellac
parents:
diff changeset
1379 attribute."""
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shellac
parents:
diff changeset
1380 return self.attrs.get(key, default)
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shellac
parents:
diff changeset
1381
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shellac
parents:
diff changeset
1382 def get_attribute_list(self, key, default=None):
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shellac
parents:
diff changeset
1383 """The same as get(), but always returns a list.
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shellac
parents:
diff changeset
1384
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shellac
parents:
diff changeset
1385 :param key: The attribute to look for.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1386 :param default: Use this value if the attribute is not present
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shellac
parents:
diff changeset
1387 on this PageElement.
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shellac
parents:
diff changeset
1388 :return: A list of values, probably containing only a single
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shellac
parents:
diff changeset
1389 value.
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shellac
parents:
diff changeset
1390 """
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shellac
parents:
diff changeset
1391 value = self.get(key, default)
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shellac
parents:
diff changeset
1392 if not isinstance(value, list):
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shellac
parents:
diff changeset
1393 value = [value]
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shellac
parents:
diff changeset
1394 return value
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shellac
parents:
diff changeset
1395
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shellac
parents:
diff changeset
1396 def has_attr(self, key):
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shellac
parents:
diff changeset
1397 """Does this PageElement have an attribute with the given name?"""
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parents:
diff changeset
1398 return key in self.attrs
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parents:
diff changeset
1399
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parents:
diff changeset
1400 def __hash__(self):
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parents:
diff changeset
1401 return str(self).__hash__()
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parents:
diff changeset
1402
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parents:
diff changeset
1403 def __getitem__(self, key):
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parents:
diff changeset
1404 """tag[key] returns the value of the 'key' attribute for the Tag,
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shellac
parents:
diff changeset
1405 and throws an exception if it's not there."""
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parents:
diff changeset
1406 return self.attrs[key]
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parents:
diff changeset
1407
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parents:
diff changeset
1408 def __iter__(self):
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parents:
diff changeset
1409 "Iterating over a Tag iterates over its contents."
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parents:
diff changeset
1410 return iter(self.contents)
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parents:
diff changeset
1411
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parents:
diff changeset
1412 def __len__(self):
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parents:
diff changeset
1413 "The length of a Tag is the length of its list of contents."
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parents:
diff changeset
1414 return len(self.contents)
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parents:
diff changeset
1415
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parents:
diff changeset
1416 def __contains__(self, x):
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parents:
diff changeset
1417 return x in self.contents
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parents:
diff changeset
1418
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parents:
diff changeset
1419 def __bool__(self):
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parents:
diff changeset
1420 "A tag is non-None even if it has no contents."
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parents:
diff changeset
1421 return True
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parents:
diff changeset
1422
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parents:
diff changeset
1423 def __setitem__(self, key, value):
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parents:
diff changeset
1424 """Setting tag[key] sets the value of the 'key' attribute for the
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parents:
diff changeset
1425 tag."""
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parents:
diff changeset
1426 self.attrs[key] = value
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parents:
diff changeset
1427
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parents:
diff changeset
1428 def __delitem__(self, key):
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parents:
diff changeset
1429 "Deleting tag[key] deletes all 'key' attributes for the tag."
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parents:
diff changeset
1430 self.attrs.pop(key, None)
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parents:
diff changeset
1431
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parents:
diff changeset
1432 def __call__(self, *args, **kwargs):
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shellac
parents:
diff changeset
1433 """Calling a Tag like a function is the same as calling its
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1434 find_all() method. Eg. tag('a') returns a list of all the A tags
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parents:
diff changeset
1435 found within this tag."""
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shellac
parents:
diff changeset
1436 return self.find_all(*args, **kwargs)
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parents:
diff changeset
1437
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parents:
diff changeset
1438 def __getattr__(self, tag):
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shellac
parents:
diff changeset
1439 """Calling tag.subtag is the same as calling tag.find(name="subtag")"""
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shellac
parents:
diff changeset
1440 #print("Getattr %s.%s" % (self.__class__, tag))
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shellac
parents:
diff changeset
1441 if len(tag) > 3 and tag.endswith('Tag'):
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shellac
parents:
diff changeset
1442 # BS3: soup.aTag -> "soup.find("a")
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shellac
parents:
diff changeset
1443 tag_name = tag[:-3]
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parents:
diff changeset
1444 warnings.warn(
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parents:
diff changeset
1445 '.%(name)sTag is deprecated, use .find("%(name)s") instead. If you really were looking for a tag called %(name)sTag, use .find("%(name)sTag")' % dict(
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shellac
parents:
diff changeset
1446 name=tag_name
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parents:
diff changeset
1447 )
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parents:
diff changeset
1448 )
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parents:
diff changeset
1449 return self.find(tag_name)
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shellac
parents:
diff changeset
1450 # We special case contents to avoid recursion.
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shellac
parents:
diff changeset
1451 elif not tag.startswith("__") and not tag == "contents":
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parents:
diff changeset
1452 return self.find(tag)
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parents:
diff changeset
1453 raise AttributeError(
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parents:
diff changeset
1454 "'%s' object has no attribute '%s'" % (self.__class__, tag))
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parents:
diff changeset
1455
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parents:
diff changeset
1456 def __eq__(self, other):
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shellac
parents:
diff changeset
1457 """Returns true iff this Tag has the same name, the same attributes,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1458 and the same contents (recursively) as `other`."""
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parents:
diff changeset
1459 if self is other:
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parents:
diff changeset
1460 return True
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parents:
diff changeset
1461 if (not hasattr(other, 'name') or
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shellac
parents:
diff changeset
1462 not hasattr(other, 'attrs') or
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shellac
parents:
diff changeset
1463 not hasattr(other, 'contents') or
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shellac
parents:
diff changeset
1464 self.name != other.name or
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shellac
parents:
diff changeset
1465 self.attrs != other.attrs or
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shellac
parents:
diff changeset
1466 len(self) != len(other)):
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parents:
diff changeset
1467 return False
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shellac
parents:
diff changeset
1468 for i, my_child in enumerate(self.contents):
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shellac
parents:
diff changeset
1469 if my_child != other.contents[i]:
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shellac
parents:
diff changeset
1470 return False
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shellac
parents:
diff changeset
1471 return True
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parents:
diff changeset
1472
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parents:
diff changeset
1473 def __ne__(self, other):
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shellac
parents:
diff changeset
1474 """Returns true iff this Tag is not identical to `other`,
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shellac
parents:
diff changeset
1475 as defined in __eq__."""
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shellac
parents:
diff changeset
1476 return not self == other
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parents:
diff changeset
1477
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shellac
parents:
diff changeset
1478 def __repr__(self, encoding="unicode-escape"):
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shellac
parents:
diff changeset
1479 """Renders this PageElement as a string.
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shellac
parents:
diff changeset
1480
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parents:
diff changeset
1481 :param encoding: The encoding to use (Python 2 only).
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shellac
parents:
diff changeset
1482 :return: Under Python 2, a bytestring; under Python 3,
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shellac
parents:
diff changeset
1483 a Unicode string.
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shellac
parents:
diff changeset
1484 """
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shellac
parents:
diff changeset
1485 if PY3K:
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shellac
parents:
diff changeset
1486 # "The return value must be a string object", i.e. Unicode
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shellac
parents:
diff changeset
1487 return self.decode()
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parents:
diff changeset
1488 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1489 # "The return value must be a string object", i.e. a bytestring.
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shellac
parents:
diff changeset
1490 # By convention, the return value of __repr__ should also be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1491 # an ASCII string.
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shellac
parents:
diff changeset
1492 return self.encode(encoding)
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parents:
diff changeset
1493
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shellac
parents:
diff changeset
1494 def __unicode__(self):
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shellac
parents:
diff changeset
1495 """Renders this PageElement as a Unicode string."""
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shellac
parents:
diff changeset
1496 return self.decode()
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parents:
diff changeset
1497
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shellac
parents:
diff changeset
1498 def __str__(self):
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shellac
parents:
diff changeset
1499 """Renders this PageElement as a generic string.
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shellac
parents:
diff changeset
1500
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shellac
parents:
diff changeset
1501 :return: Under Python 2, a UTF-8 bytestring; under Python 3,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1502 a Unicode string.
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shellac
parents:
diff changeset
1503 """
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shellac
parents:
diff changeset
1504 if PY3K:
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shellac
parents:
diff changeset
1505 return self.decode()
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parents:
diff changeset
1506 else:
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shellac
parents:
diff changeset
1507 return self.encode()
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shellac
parents:
diff changeset
1508
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parents:
diff changeset
1509 if PY3K:
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shellac
parents:
diff changeset
1510 __str__ = __repr__ = __unicode__
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shellac
parents:
diff changeset
1511
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parents:
diff changeset
1512 def encode(self, encoding=DEFAULT_OUTPUT_ENCODING,
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shellac
parents:
diff changeset
1513 indent_level=None, formatter="minimal",
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shellac
parents:
diff changeset
1514 errors="xmlcharrefreplace"):
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shellac
parents:
diff changeset
1515 """Render a bytestring representation of this PageElement and its
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shellac
parents:
diff changeset
1516 contents.
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parents:
diff changeset
1517
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parents:
diff changeset
1518 :param encoding: The destination encoding.
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shellac
parents:
diff changeset
1519 :param indent_level: Each line of the rendering will be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1520 indented this many spaces. Used internally in
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shellac
parents:
diff changeset
1521 recursive calls while pretty-printing.
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shellac
parents:
diff changeset
1522 :param formatter: A Formatter object, or a string naming one of
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1523 the standard formatters.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1524 :param errors: An error handling strategy such as
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1525 'xmlcharrefreplace'. This value is passed along into
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1526 encode() and its value should be one of the constants
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1527 defined by Python.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1528 :return: A bytestring.
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shellac
parents:
diff changeset
1529
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1530 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1531 # Turn the data structure into Unicode, then encode the
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1532 # Unicode.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1533 u = self.decode(indent_level, encoding, formatter)
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shellac
parents:
diff changeset
1534 return u.encode(encoding, errors)
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shellac
parents:
diff changeset
1535
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shellac
parents:
diff changeset
1536 def decode(self, indent_level=None,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1537 eventual_encoding=DEFAULT_OUTPUT_ENCODING,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1538 formatter="minimal"):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1539 """Render a Unicode representation of this PageElement and its
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1540 contents.
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shellac
parents:
diff changeset
1541
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1542 :param indent_level: Each line of the rendering will be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1543 indented this many spaces. Used internally in
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1544 recursive calls while pretty-printing.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1545 :param eventual_encoding: The tag is destined to be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1546 encoded into this encoding. This method is _not_
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1547 responsible for performing that encoding. This information
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shellac
parents:
diff changeset
1548 is passed in so that it can be substituted in if the
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1549 document contains a <META> tag that mentions the document's
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1550 encoding.
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shellac
parents:
diff changeset
1551 :param formatter: A Formatter object, or a string naming one of
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1552 the standard formatters.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1553 """
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shellac
parents:
diff changeset
1554
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1555 # First off, turn a non-Formatter `formatter` into a Formatter
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1556 # object. This will stop the lookup from happening over and
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shellac
parents:
diff changeset
1557 # over again.
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shellac
parents:
diff changeset
1558 if not isinstance(formatter, Formatter):
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shellac
parents:
diff changeset
1559 formatter = self.formatter_for_name(formatter)
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shellac
parents:
diff changeset
1560 attributes = formatter.attributes(self)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1561 attrs = []
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shellac
parents:
diff changeset
1562 for key, val in attributes:
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shellac
parents:
diff changeset
1563 if val is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1564 decoded = key
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1565 else:
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shellac
parents:
diff changeset
1566 if isinstance(val, list) or isinstance(val, tuple):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1567 val = ' '.join(val)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1568 elif not isinstance(val, str):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1569 val = str(val)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1570 elif (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1571 isinstance(val, AttributeValueWithCharsetSubstitution)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1572 and eventual_encoding is not None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1573 ):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1574 val = val.encode(eventual_encoding)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1575
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1576 text = formatter.attribute_value(val)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1577 decoded = (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1578 str(key) + '='
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1579 + formatter.quoted_attribute_value(text))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1580 attrs.append(decoded)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1581 close = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1582 closeTag = ''
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shellac
parents:
diff changeset
1583
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1584 prefix = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1585 if self.prefix:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1586 prefix = self.prefix + ":"
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1587
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1588 if self.is_empty_element:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1589 close = formatter.void_element_close_prefix or ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1590 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1591 closeTag = '</%s%s>' % (prefix, self.name)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1592
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shellac
parents:
diff changeset
1593 pretty_print = self._should_pretty_print(indent_level)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1594 space = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1595 indent_space = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1596 if indent_level is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1597 indent_space = (' ' * (indent_level - 1))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1598 if pretty_print:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1599 space = indent_space
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1600 indent_contents = indent_level + 1
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1601 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1602 indent_contents = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1603 contents = self.decode_contents(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1604 indent_contents, eventual_encoding, formatter
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1605 )
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1606
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1607 if self.hidden:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1608 # This is the 'document root' object.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1609 s = contents
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1610 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1611 s = []
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1612 attribute_string = ''
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1613 if attrs:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1614 attribute_string = ' ' + ' '.join(attrs)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1615 if indent_level is not None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1616 # Even if this particular tag is not pretty-printed,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1617 # we should indent up to the start of the tag.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1618 s.append(indent_space)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1619 s.append('<%s%s%s%s>' % (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1620 prefix, self.name, attribute_string, close))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1621 if pretty_print:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1622 s.append("\n")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1623 s.append(contents)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1624 if pretty_print and contents and contents[-1] != "\n":
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1625 s.append("\n")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1626 if pretty_print and closeTag:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1627 s.append(space)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1628 s.append(closeTag)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1629 if indent_level is not None and closeTag and self.next_sibling:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1630 # Even if this particular tag is not pretty-printed,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1631 # we're now done with the tag, and we should add a
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1632 # newline if appropriate.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1633 s.append("\n")
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1634 s = ''.join(s)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1635 return s
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1636
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1637 def _should_pretty_print(self, indent_level):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1638 """Should this tag be pretty-printed?
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1639
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1640 Most of them should, but some (such as <pre> in HTML
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1641 documents) should not.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1642 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1643 return (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1644 indent_level is not None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1645 and (
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1646 not self.preserve_whitespace_tags
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1647 or self.name not in self.preserve_whitespace_tags
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1648 )
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1649 )
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parents:
diff changeset
1650
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parents:
diff changeset
1651 def prettify(self, encoding=None, formatter="minimal"):
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shellac
parents:
diff changeset
1652 """Pretty-print this PageElement as a string.
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shellac
parents:
diff changeset
1653
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parents:
diff changeset
1654 :param encoding: The eventual encoding of the string. If this is None,
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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parents:
diff changeset
1655 a Unicode string will be returned.
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parents:
diff changeset
1656 :param formatter: A Formatter object, or a string naming one of
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1657 the standard formatters.
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shellac
parents:
diff changeset
1658 :return: A Unicode string (if encoding==None) or a bytestring
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shellac
parents:
diff changeset
1659 (otherwise).
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parents:
diff changeset
1660 """
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shellac
parents:
diff changeset
1661 if encoding is None:
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shellac
parents:
diff changeset
1662 return self.decode(True, formatter=formatter)
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parents:
diff changeset
1663 else:
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shellac
parents:
diff changeset
1664 return self.encode(encoding, True, formatter=formatter)
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parents:
diff changeset
1665
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parents:
diff changeset
1666 def decode_contents(self, indent_level=None,
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parents:
diff changeset
1667 eventual_encoding=DEFAULT_OUTPUT_ENCODING,
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parents:
diff changeset
1668 formatter="minimal"):
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parents:
diff changeset
1669 """Renders the contents of this tag as a Unicode string.
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shellac
parents:
diff changeset
1670
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parents:
diff changeset
1671 :param indent_level: Each line of the rendering will be
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parents:
diff changeset
1672 indented this many spaces. Used internally in
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shellac
parents:
diff changeset
1673 recursive calls while pretty-printing.
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shellac
parents:
diff changeset
1674
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shellac
parents:
diff changeset
1675 :param eventual_encoding: The tag is destined to be
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shellac
parents:
diff changeset
1676 encoded into this encoding. decode_contents() is _not_
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shellac
parents:
diff changeset
1677 responsible for performing that encoding. This information
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shellac
parents:
diff changeset
1678 is passed in so that it can be substituted in if the
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1679 document contains a <META> tag that mentions the document's
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shellac
parents:
diff changeset
1680 encoding.
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parents:
diff changeset
1681
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parents:
diff changeset
1682 :param formatter: A Formatter object, or a string naming one of
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shellac
parents:
diff changeset
1683 the standard Formatters.
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shellac
parents:
diff changeset
1684 """
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shellac
parents:
diff changeset
1685 # First off, turn a string formatter into a Formatter object. This
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shellac
parents:
diff changeset
1686 # will stop the lookup from happening over and over again.
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shellac
parents:
diff changeset
1687 if not isinstance(formatter, Formatter):
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shellac
parents:
diff changeset
1688 formatter = self.formatter_for_name(formatter)
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shellac
parents:
diff changeset
1689
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shellac
parents:
diff changeset
1690 pretty_print = (indent_level is not None)
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shellac
parents:
diff changeset
1691 s = []
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shellac
parents:
diff changeset
1692 for c in self:
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shellac
parents:
diff changeset
1693 text = None
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shellac
parents:
diff changeset
1694 if isinstance(c, NavigableString):
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shellac
parents:
diff changeset
1695 text = c.output_ready(formatter)
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shellac
parents:
diff changeset
1696 elif isinstance(c, Tag):
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shellac
parents:
diff changeset
1697 s.append(c.decode(indent_level, eventual_encoding,
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shellac
parents:
diff changeset
1698 formatter))
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shellac
parents:
diff changeset
1699 preserve_whitespace = (
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shellac
parents:
diff changeset
1700 self.preserve_whitespace_tags and self.name in self.preserve_whitespace_tags
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shellac
parents:
diff changeset
1701 )
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shellac
parents:
diff changeset
1702 if text and indent_level and not preserve_whitespace:
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shellac
parents:
diff changeset
1703 text = text.strip()
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shellac
parents:
diff changeset
1704 if text:
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shellac
parents:
diff changeset
1705 if pretty_print and not preserve_whitespace:
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shellac
parents:
diff changeset
1706 s.append(" " * (indent_level - 1))
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shellac
parents:
diff changeset
1707 s.append(text)
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shellac
parents:
diff changeset
1708 if pretty_print and not preserve_whitespace:
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shellac
parents:
diff changeset
1709 s.append("\n")
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parents:
diff changeset
1710 return ''.join(s)
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parents:
diff changeset
1711
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shellac
parents:
diff changeset
1712 def encode_contents(
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parents:
diff changeset
1713 self, indent_level=None, encoding=DEFAULT_OUTPUT_ENCODING,
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shellac
parents:
diff changeset
1714 formatter="minimal"):
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shellac
parents:
diff changeset
1715 """Renders the contents of this PageElement as a bytestring.
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shellac
parents:
diff changeset
1716
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parents:
diff changeset
1717 :param indent_level: Each line of the rendering will be
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1718 indented this many spaces. Used internally in
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1719 recursive calls while pretty-printing.
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shellac
parents:
diff changeset
1720
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parents:
diff changeset
1721 :param eventual_encoding: The bytestring will be in this encoding.
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shellac
parents:
diff changeset
1722
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parents:
diff changeset
1723 :param formatter: A Formatter object, or a string naming one of
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1724 the standard Formatters.
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shellac
parents:
diff changeset
1725
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shellac
parents:
diff changeset
1726 :return: A bytestring.
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shellac
parents:
diff changeset
1727 """
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shellac
parents:
diff changeset
1728 contents = self.decode_contents(indent_level, encoding, formatter)
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shellac
parents:
diff changeset
1729 return contents.encode(encoding)
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shellac
parents:
diff changeset
1730
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shellac
parents:
diff changeset
1731 # Old method for BS3 compatibility
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shellac
parents:
diff changeset
1732 def renderContents(self, encoding=DEFAULT_OUTPUT_ENCODING,
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shellac
parents:
diff changeset
1733 prettyPrint=False, indentLevel=0):
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shellac
parents:
diff changeset
1734 """Deprecated method for BS3 compatibility."""
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shellac
parents:
diff changeset
1735 if not prettyPrint:
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shellac
parents:
diff changeset
1736 indentLevel = None
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shellac
parents:
diff changeset
1737 return self.encode_contents(
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parents:
diff changeset
1738 indent_level=indentLevel, encoding=encoding)
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shellac
parents:
diff changeset
1739
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shellac
parents:
diff changeset
1740 #Soup methods
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parents:
diff changeset
1741
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shellac
parents:
diff changeset
1742 def find(self, name=None, attrs={}, recursive=True, text=None,
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shellac
parents:
diff changeset
1743 **kwargs):
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shellac
parents:
diff changeset
1744 """Look in the children of this PageElement and find the first
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1745 PageElement that matches the given criteria.
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shellac
parents:
diff changeset
1746
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shellac
parents:
diff changeset
1747 All find_* methods take a common set of arguments. See the online
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1748 documentation for detailed explanations.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1749
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shellac
parents:
diff changeset
1750 :param name: A filter on tag name.
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shellac
parents:
diff changeset
1751 :param attrs: A dictionary of filters on attribute values.
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shellac
parents:
diff changeset
1752 :param recursive: If this is True, find() will perform a
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1753 recursive search of this PageElement's children. Otherwise,
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shellac
parents:
diff changeset
1754 only the direct children will be considered.
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shellac
parents:
diff changeset
1755 :param limit: Stop looking after finding this many results.
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shellac
parents:
diff changeset
1756 :kwargs: A dictionary of filters on attribute values.
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parents:
diff changeset
1757 :return: A PageElement.
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shellac
parents:
diff changeset
1758 :rtype: bs4.element.Tag | bs4.element.NavigableString
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shellac
parents:
diff changeset
1759 """
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shellac
parents:
diff changeset
1760 r = None
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shellac
parents:
diff changeset
1761 l = self.find_all(name, attrs, recursive, text, 1, **kwargs)
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shellac
parents:
diff changeset
1762 if l:
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shellac
parents:
diff changeset
1763 r = l[0]
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shellac
parents:
diff changeset
1764 return r
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shellac
parents:
diff changeset
1765 findChild = find #BS2
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shellac
parents:
diff changeset
1766
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parents:
diff changeset
1767 def find_all(self, name=None, attrs={}, recursive=True, text=None,
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shellac
parents:
diff changeset
1768 limit=None, **kwargs):
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shellac
parents:
diff changeset
1769 """Look in the children of this PageElement and find all
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1770 PageElements that match the given criteria.
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shellac
parents:
diff changeset
1771
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shellac
parents:
diff changeset
1772 All find_* methods take a common set of arguments. See the online
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
1773 documentation for detailed explanations.
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shellac
parents:
diff changeset
1774
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1775 :param name: A filter on tag name.
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1776 :param attrs: A dictionary of filters on attribute values.
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1777 :param recursive: If this is True, find_all() will perform a
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diff changeset
1778 recursive search of this PageElement's children. Otherwise,
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diff changeset
1779 only the direct children will be considered.
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diff changeset
1780 :param limit: Stop looking after finding this many results.
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diff changeset
1781 :kwargs: A dictionary of filters on attribute values.
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diff changeset
1782 :return: A ResultSet of PageElements.
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1783 :rtype: bs4.element.ResultSet
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1784 """
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diff changeset
1785 generator = self.descendants
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1786 if not recursive:
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diff changeset
1787 generator = self.children
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diff changeset
1788 return self._find_all(name, attrs, text, limit, generator, **kwargs)
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diff changeset
1789 findAll = find_all # BS3
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diff changeset
1790 findChildren = find_all # BS2
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diff changeset
1791
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diff changeset
1792 #Generator methods
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diff changeset
1793 @property
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diff changeset
1794 def children(self):
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diff changeset
1795 """Iterate over all direct children of this PageElement.
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diff changeset
1796
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1797 :yield: A sequence of PageElements.
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1798 """
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1799 # return iter() to make the purpose of the method clear
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diff changeset
1800 return iter(self.contents) # XXX This seems to be untested.
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1801
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diff changeset
1802 @property
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diff changeset
1803 def descendants(self):
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diff changeset
1804 """Iterate over all children of this PageElement in a
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diff changeset
1805 breadth-first sequence.
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1806
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1807 :yield: A sequence of PageElements.
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1808 """
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1809 if not len(self.contents):
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diff changeset
1810 return
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1811 stopNode = self._last_descendant().next_element
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diff changeset
1812 current = self.contents[0]
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diff changeset
1813 while current is not stopNode:
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1814 yield current
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diff changeset
1815 current = current.next_element
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1816
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1817 # CSS selector code
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1818 def select_one(self, selector, namespaces=None, **kwargs):
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diff changeset
1819 """Perform a CSS selection operation on the current element.
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1820
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1821 :param selector: A CSS selector.
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1822
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1823 :param namespaces: A dictionary mapping namespace prefixes
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1824 used in the CSS selector to namespace URIs. By default,
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diff changeset
1825 Beautiful Soup will use the prefixes it encountered while
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diff changeset
1826 parsing the document.
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1827
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1828 :param kwargs: Keyword arguments to be passed into SoupSieve's
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1829 soupsieve.select() method.
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1830
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1831 :return: A Tag.
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1832 :rtype: bs4.element.Tag
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1833 """
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1834 value = self.select(selector, namespaces, 1, **kwargs)
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1835 if value:
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diff changeset
1836 return value[0]
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1837 return None
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1838
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1839 def select(self, selector, namespaces=None, limit=None, **kwargs):
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1840 """Perform a CSS selection operation on the current element.
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1841
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1842 This uses the SoupSieve library.
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1843
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1844 :param selector: A string containing a CSS selector.
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diff changeset
1845
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1846 :param namespaces: A dictionary mapping namespace prefixes
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diff changeset
1847 used in the CSS selector to namespace URIs. By default,
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diff changeset
1848 Beautiful Soup will use the prefixes it encountered while
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diff changeset
1849 parsing the document.
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diff changeset
1850
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1851 :param limit: After finding this number of results, stop looking.
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1852
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1853 :param kwargs: Keyword arguments to be passed into SoupSieve's
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1854 soupsieve.select() method.
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1855
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1856 :return: A ResultSet of Tags.
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1857 :rtype: bs4.element.ResultSet
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1858 """
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1859 if namespaces is None:
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1860 namespaces = self._namespaces
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1861
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1862 if limit is None:
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diff changeset
1863 limit = 0
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diff changeset
1864 if soupsieve is None:
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diff changeset
1865 raise NotImplementedError(
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1866 "Cannot execute CSS selectors because the soupsieve package is not installed."
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1867 )
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diff changeset
1868
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1869 results = soupsieve.select(selector, self, namespaces, limit, **kwargs)
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1870
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diff changeset
1871 # We do this because it's more consistent and because
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diff changeset
1872 # ResultSet.__getattr__ has a helpful error message.
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1873 return ResultSet(None, results)
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1874
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diff changeset
1875 # Old names for backwards compatibility
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diff changeset
1876 def childGenerator(self):
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diff changeset
1877 """Deprecated generator."""
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1878 return self.children
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1879
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1880 def recursiveChildGenerator(self):
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diff changeset
1881 """Deprecated generator."""
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1882 return self.descendants
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1883
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1884 def has_key(self, key):
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diff changeset
1885 """Deprecated method. This was kind of misleading because has_key()
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1886 (attributes) was different from __in__ (contents).
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1887
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1888 has_key() is gone in Python 3, anyway.
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1889 """
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1890 warnings.warn('has_key is deprecated. Use has_attr("%s") instead.' % (
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1891 key))
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1892 return self.has_attr(key)
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1893
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1894 # Next, a couple classes to represent queries and their results.
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diff changeset
1895 class SoupStrainer(object):
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1896 """Encapsulates a number of ways of matching a markup element (tag or
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1897 string).
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1898
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1899 This is primarily used to underpin the find_* methods, but you can
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1900 create one yourself and pass it in as `parse_only` to the
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1901 `BeautifulSoup` constructor, to parse a subset of a large
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1902 document.
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1903 """
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1904
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1905 def __init__(self, name=None, attrs={}, text=None, **kwargs):
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1906 """Constructor.
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1907
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1908 The SoupStrainer constructor takes the same arguments passed
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1909 into the find_* methods. See the online documentation for
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1910 detailed explanations.
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1911
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1912 :param name: A filter on tag name.
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1913 :param attrs: A dictionary of filters on attribute values.
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1914 :param text: A filter for a NavigableString with specific text.
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1915 :kwargs: A dictionary of filters on attribute values.
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1916 """
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1917 self.name = self._normalize_search_value(name)
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1918 if not isinstance(attrs, dict):
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1919 # Treat a non-dict value for attrs as a search for the 'class'
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1920 # attribute.
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1921 kwargs['class'] = attrs
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1922 attrs = None
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1923
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1924 if 'class_' in kwargs:
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1925 # Treat class_="foo" as a search for the 'class'
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1926 # attribute, overriding any non-dict value for attrs.
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1927 kwargs['class'] = kwargs['class_']
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1928 del kwargs['class_']
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1929
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1930 if kwargs:
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1931 if attrs:
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1932 attrs = attrs.copy()
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1933 attrs.update(kwargs)
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1934 else:
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1935 attrs = kwargs
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1936 normalized_attrs = {}
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1937 for key, value in list(attrs.items()):
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1938 normalized_attrs[key] = self._normalize_search_value(value)
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1939
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1940 self.attrs = normalized_attrs
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1941 self.text = self._normalize_search_value(text)
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1942
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1943 def _normalize_search_value(self, value):
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1944 # Leave it alone if it's a Unicode string, a callable, a
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1945 # regular expression, a boolean, or None.
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1946 if (isinstance(value, str) or isinstance(value, Callable) or hasattr(value, 'match')
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1947 or isinstance(value, bool) or value is None):
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1948 return value
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1949
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1950 # If it's a bytestring, convert it to Unicode, treating it as UTF-8.
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1951 if isinstance(value, bytes):
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1952 return value.decode("utf8")
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1953
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1954 # If it's listlike, convert it into a list of strings.
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1955 if hasattr(value, '__iter__'):
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1956 new_value = []
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1957 for v in value:
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1958 if (hasattr(v, '__iter__') and not isinstance(v, bytes)
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1959 and not isinstance(v, str)):
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1960 # This is almost certainly the user's mistake. In the
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1961 # interests of avoiding infinite loops, we'll let
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1962 # it through as-is rather than doing a recursive call.
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1963 new_value.append(v)
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1964 else:
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1965 new_value.append(self._normalize_search_value(v))
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1966 return new_value
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1967
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1968 # Otherwise, convert it into a Unicode string.
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1969 # The unicode(str()) thing is so this will do the same thing on Python 2
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1970 # and Python 3.
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1971 return str(str(value))
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1972
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1973 def __str__(self):
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1974 """A human-readable representation of this SoupStrainer."""
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1975 if self.text:
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1976 return self.text
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1977 else:
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1978 return "%s|%s" % (self.name, self.attrs)
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1979
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1980 def search_tag(self, markup_name=None, markup_attrs={}):
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1981 """Check whether a Tag with the given name and attributes would
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1982 match this SoupStrainer.
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1983
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1984 Used prospectively to decide whether to even bother creating a Tag
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1985 object.
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1986
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1987 :param markup_name: A tag name as found in some markup.
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1988 :param markup_attrs: A dictionary of attributes as found in some markup.
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1989
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1990 :return: True if the prospective tag would match this SoupStrainer;
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1991 False otherwise.
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1992 """
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1993 found = None
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1994 markup = None
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1995 if isinstance(markup_name, Tag):
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1996 markup = markup_name
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1997 markup_attrs = markup
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1998
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1999 if isinstance(self.name, str):
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2000 # Optimization for a very common case where the user is
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2001 # searching for a tag with one specific name, and we're
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2002 # looking at a tag with a different name.
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2003 if markup and not markup.prefix and self.name != markup.name:
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2004 return False
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2005
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2006 call_function_with_tag_data = (
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2007 isinstance(self.name, Callable)
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2008 and not isinstance(markup_name, Tag))
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2009
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2010 if ((not self.name)
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2011 or call_function_with_tag_data
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2012 or (markup and self._matches(markup, self.name))
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2013 or (not markup and self._matches(markup_name, self.name))):
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2014 if call_function_with_tag_data:
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2015 match = self.name(markup_name, markup_attrs)
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2016 else:
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2017 match = True
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2018 markup_attr_map = None
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2019 for attr, match_against in list(self.attrs.items()):
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2020 if not markup_attr_map:
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2021 if hasattr(markup_attrs, 'get'):
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2022 markup_attr_map = markup_attrs
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2023 else:
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2024 markup_attr_map = {}
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2025 for k, v in markup_attrs:
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2026 markup_attr_map[k] = v
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2027 attr_value = markup_attr_map.get(attr)
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2028 if not self._matches(attr_value, match_against):
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shellac
parents:
diff changeset
2029 match = False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2030 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2031 if match:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2032 if markup:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2033 found = markup
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2034 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2035 found = markup_name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2036 if found and self.text and not self._matches(found.string, self.text):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2037 found = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2038 return found
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2039
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2040 # For BS3 compatibility.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2041 searchTag = search_tag
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2042
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2043 def search(self, markup):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2044 """Find all items in `markup` that match this SoupStrainer.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2045
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2046 Used by the core _find_all() method, which is ultimately
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2047 called by all find_* methods.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2048
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2049 :param markup: A PageElement or a list of them.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2050 """
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2051 # print('looking for %s in %s' % (self, markup))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2052 found = None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2053 # If given a list of items, scan it for a text element that
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2054 # matches.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2055 if hasattr(markup, '__iter__') and not isinstance(markup, (Tag, str)):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2056 for element in markup:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2057 if isinstance(element, NavigableString) \
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2058 and self.search(element):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2059 found = element
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2060 break
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2061 # If it's a Tag, make sure its name or attributes match.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2062 # Don't bother with Tags if we're searching for text.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2063 elif isinstance(markup, Tag):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2064 if not self.text or self.name or self.attrs:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2065 found = self.search_tag(markup)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2066 # If it's text, make sure the text matches.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2067 elif isinstance(markup, NavigableString) or \
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2068 isinstance(markup, str):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2069 if not self.name and not self.attrs and self._matches(markup, self.text):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2070 found = markup
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2071 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2072 raise Exception(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2073 "I don't know how to match against a %s" % markup.__class__)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2074 return found
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2075
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2076 def _matches(self, markup, match_against, already_tried=None):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2077 # print(u"Matching %s against %s" % (markup, match_against))
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2078 result = False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2079 if isinstance(markup, list) or isinstance(markup, tuple):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2080 # This should only happen when searching a multi-valued attribute
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2081 # like 'class'.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2082 for item in markup:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2083 if self._matches(item, match_against):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2084 return True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2085 # We didn't match any particular value of the multivalue
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2086 # attribute, but maybe we match the attribute value when
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2087 # considered as a string.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2088 if self._matches(' '.join(markup), match_against):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2089 return True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2090 return False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2091
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2092 if match_against is True:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2093 # True matches any non-None value.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2094 return markup is not None
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2095
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2096 if isinstance(match_against, Callable):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2097 return match_against(markup)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2098
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2099 # Custom callables take the tag as an argument, but all
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2100 # other ways of matching match the tag name as a string.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2101 original_markup = markup
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2102 if isinstance(markup, Tag):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2103 markup = markup.name
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2104
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2105 # Ensure that `markup` is either a Unicode string, or None.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2106 markup = self._normalize_search_value(markup)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2107
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2108 if markup is None:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2109 # None matches None, False, an empty string, an empty list, and so on.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2110 return not match_against
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2111
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2112 if (hasattr(match_against, '__iter__')
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2113 and not isinstance(match_against, str)):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2114 # We're asked to match against an iterable of items.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2115 # The markup must be match at least one item in the
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2116 # iterable. We'll try each one in turn.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2117 #
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2118 # To avoid infinite recursion we need to keep track of
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2119 # items we've already seen.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2120 if not already_tried:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2121 already_tried = set()
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2122 for item in match_against:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2123 if item.__hash__:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2124 key = item
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2125 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2126 key = id(item)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2127 if key in already_tried:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2128 continue
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2129 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2130 already_tried.add(key)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2131 if self._matches(original_markup, item, already_tried):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2132 return True
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2133 else:
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2134 return False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2135
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2136 # Beyond this point we might need to run the test twice: once against
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2137 # the tag's name and once against its prefixed name.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2138 match = False
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2139
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2140 if not match and isinstance(match_against, str):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2141 # Exact string match
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2142 match = markup == match_against
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2143
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2144 if not match and hasattr(match_against, 'search'):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2145 # Regexp match
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2146 return match_against.search(markup)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2147
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2148 if (not match
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2149 and isinstance(original_markup, Tag)
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2150 and original_markup.prefix):
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2151 # Try the whole thing again with the prefixed tag name.
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2152 return self._matches(
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2153 original_markup.prefix + ':' + original_markup.name, match_against
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2154 )
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
shellac
parents:
diff changeset
2155
4f3585e2f14b "planemo upload commit 60cee0fc7c0cda8592644e1aad72851dec82c959"
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2156 return match
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2157
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2158
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2159 class ResultSet(list):
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2160 """A ResultSet is just a list that keeps track of the SoupStrainer
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2161 that created it."""
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2162 def __init__(self, source, result=()):
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2163 """Constructor.
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2164
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2165 :param source: A SoupStrainer.
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2166 :param result: A list of PageElements.
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2167 """
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2168 super(ResultSet, self).__init__(result)
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2169 self.source = source
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2170
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2171 def __getattr__(self, key):
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2172 """Raise a helpful exception to explain a common code fix."""
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2173 raise AttributeError(
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2174 "ResultSet object has no attribute '%s'. You're probably treating a list of elements like a single element. Did you call find_all() when you meant to call find()?" % key
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2175 )