Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/bs4/builder/__init__.py @ 0:d30785e31577 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:18:57 -0400
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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 from collections import defaultdict
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5 import itertools
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6 import sys
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7 from bs4.element import (
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8 CharsetMetaAttributeValue,
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9 ContentMetaAttributeValue,
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10 Stylesheet,
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11 Script,
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12 TemplateString,
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13 nonwhitespace_re
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14 )
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15
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16 __all__ = [
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17 'HTMLTreeBuilder',
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18 'SAXTreeBuilder',
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19 'TreeBuilder',
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20 'TreeBuilderRegistry',
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21 ]
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22
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23 # Some useful features for a TreeBuilder to have.
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24 FAST = 'fast'
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25 PERMISSIVE = 'permissive'
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26 STRICT = 'strict'
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27 XML = 'xml'
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28 HTML = 'html'
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29 HTML_5 = 'html5'
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30
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31
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32 class TreeBuilderRegistry(object):
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33 """A way of looking up TreeBuilder subclasses by their name or by desired
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34 features.
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35 """
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36
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37 def __init__(self):
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38 self.builders_for_feature = defaultdict(list)
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39 self.builders = []
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40
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41 def register(self, treebuilder_class):
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42 """Register a treebuilder based on its advertised features.
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43
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44 :param treebuilder_class: A subclass of Treebuilder. its .features
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45 attribute should list its features.
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46 """
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47 for feature in treebuilder_class.features:
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48 self.builders_for_feature[feature].insert(0, treebuilder_class)
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49 self.builders.insert(0, treebuilder_class)
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50
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51 def lookup(self, *features):
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52 """Look up a TreeBuilder subclass with the desired features.
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53
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54 :param features: A list of features to look for. If none are
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55 provided, the most recently registered TreeBuilder subclass
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56 will be used.
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57 :return: A TreeBuilder subclass, or None if there's no
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58 registered subclass with all the requested features.
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59 """
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60 if len(self.builders) == 0:
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61 # There are no builders at all.
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62 return None
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63
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64 if len(features) == 0:
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65 # They didn't ask for any features. Give them the most
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66 # recently registered builder.
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67 return self.builders[0]
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68
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69 # Go down the list of features in order, and eliminate any builders
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70 # that don't match every feature.
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71 features = list(features)
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72 features.reverse()
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73 candidates = None
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74 candidate_set = None
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75 while len(features) > 0:
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76 feature = features.pop()
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77 we_have_the_feature = self.builders_for_feature.get(feature, [])
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78 if len(we_have_the_feature) > 0:
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79 if candidates is None:
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80 candidates = we_have_the_feature
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81 candidate_set = set(candidates)
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82 else:
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83 # Eliminate any candidates that don't have this feature.
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84 candidate_set = candidate_set.intersection(
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85 set(we_have_the_feature))
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86
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87 # The only valid candidates are the ones in candidate_set.
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88 # Go through the original list of candidates and pick the first one
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89 # that's in candidate_set.
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90 if candidate_set is None:
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91 return None
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92 for candidate in candidates:
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93 if candidate in candidate_set:
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94 return candidate
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95 return None
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96
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97 # The BeautifulSoup class will take feature lists from developers and use them
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98 # to look up builders in this registry.
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99 builder_registry = TreeBuilderRegistry()
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100
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101 class TreeBuilder(object):
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102 """Turn a textual document into a Beautiful Soup object tree."""
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103
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104 NAME = "[Unknown tree builder]"
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105 ALTERNATE_NAMES = []
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106 features = []
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107
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108 is_xml = False
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109 picklable = False
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110 empty_element_tags = None # A tag will be considered an empty-element
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111 # tag when and only when it has no contents.
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112
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113 # A value for these tag/attribute combinations is a space- or
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114 # comma-separated list of CDATA, rather than a single CDATA.
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115 DEFAULT_CDATA_LIST_ATTRIBUTES = {}
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116
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117 # Whitespace should be preserved inside these tags.
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118 DEFAULT_PRESERVE_WHITESPACE_TAGS = set()
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119
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120 # The textual contents of tags with these names should be
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121 # instantiated with some class other than NavigableString.
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122 DEFAULT_STRING_CONTAINERS = {}
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123
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124 USE_DEFAULT = object()
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125
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126 # Most parsers don't keep track of line numbers.
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127 TRACKS_LINE_NUMBERS = False
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128
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129 def __init__(self, multi_valued_attributes=USE_DEFAULT,
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130 preserve_whitespace_tags=USE_DEFAULT,
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131 store_line_numbers=USE_DEFAULT,
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132 string_containers=USE_DEFAULT,
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133 ):
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134 """Constructor.
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135
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136 :param multi_valued_attributes: If this is set to None, the
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137 TreeBuilder will not turn any values for attributes like
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138 'class' into lists. Setting this to a dictionary will
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139 customize this behavior; look at DEFAULT_CDATA_LIST_ATTRIBUTES
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140 for an example.
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141
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142 Internally, these are called "CDATA list attributes", but that
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143 probably doesn't make sense to an end-user, so the argument name
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144 is `multi_valued_attributes`.
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145
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146 :param preserve_whitespace_tags: A list of tags to treat
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147 the way <pre> tags are treated in HTML. Tags in this list
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148 are immune from pretty-printing; their contents will always be
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149 output as-is.
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150
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151 :param string_containers: A dictionary mapping tag names to
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152 the classes that should be instantiated to contain the textual
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153 contents of those tags. The default is to use NavigableString
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154 for every tag, no matter what the name. You can override the
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155 default by changing DEFAULT_STRING_CONTAINERS.
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156
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157 :param store_line_numbers: If the parser keeps track of the
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158 line numbers and positions of the original markup, that
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159 information will, by default, be stored in each corresponding
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160 `Tag` object. You can turn this off by passing
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161 store_line_numbers=False. If the parser you're using doesn't
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162 keep track of this information, then setting store_line_numbers=True
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163 will do nothing.
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164 """
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165 self.soup = None
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166 if multi_valued_attributes is self.USE_DEFAULT:
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167 multi_valued_attributes = self.DEFAULT_CDATA_LIST_ATTRIBUTES
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168 self.cdata_list_attributes = multi_valued_attributes
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169 if preserve_whitespace_tags is self.USE_DEFAULT:
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170 preserve_whitespace_tags = self.DEFAULT_PRESERVE_WHITESPACE_TAGS
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171 self.preserve_whitespace_tags = preserve_whitespace_tags
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172 if store_line_numbers == self.USE_DEFAULT:
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173 store_line_numbers = self.TRACKS_LINE_NUMBERS
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174 self.store_line_numbers = store_line_numbers
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175 if string_containers == self.USE_DEFAULT:
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176 string_containers = self.DEFAULT_STRING_CONTAINERS
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177 self.string_containers = string_containers
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178
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179 def initialize_soup(self, soup):
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180 """The BeautifulSoup object has been initialized and is now
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181 being associated with the TreeBuilder.
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182
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183 :param soup: A BeautifulSoup object.
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184 """
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185 self.soup = soup
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186
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187 def reset(self):
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188 """Do any work necessary to reset the underlying parser
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189 for a new document.
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190
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191 By default, this does nothing.
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192 """
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193 pass
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194
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195 def can_be_empty_element(self, tag_name):
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196 """Might a tag with this name be an empty-element tag?
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197
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198 The final markup may or may not actually present this tag as
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199 self-closing.
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200
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201 For instance: an HTMLBuilder does not consider a <p> tag to be
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202 an empty-element tag (it's not in
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203 HTMLBuilder.empty_element_tags). This means an empty <p> tag
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204 will be presented as "<p></p>", not "<p/>" or "<p>".
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205
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206 The default implementation has no opinion about which tags are
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207 empty-element tags, so a tag will be presented as an
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208 empty-element tag if and only if it has no children.
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209 "<foo></foo>" will become "<foo/>", and "<foo>bar</foo>" will
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210 be left alone.
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211
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212 :param tag_name: The name of a markup tag.
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213 """
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214 if self.empty_element_tags is None:
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215 return True
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216 return tag_name in self.empty_element_tags
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217
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218 def feed(self, markup):
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219 """Run some incoming markup through some parsing process,
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220 populating the `BeautifulSoup` object in self.soup.
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221
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222 This method is not implemented in TreeBuilder; it must be
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223 implemented in subclasses.
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224
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225 :return: None.
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226 """
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227 raise NotImplementedError()
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228
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229 def prepare_markup(self, markup, user_specified_encoding=None,
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230 document_declared_encoding=None, exclude_encodings=None):
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231 """Run any preliminary steps necessary to make incoming markup
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232 acceptable to the parser.
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233
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234 :param markup: Some markup -- probably a bytestring.
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235 :param user_specified_encoding: The user asked to try this encoding.
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236 :param document_declared_encoding: The markup itself claims to be
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237 in this encoding.
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238 :param exclude_encodings: The user asked _not_ to try any of
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239 these encodings.
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240
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241 :yield: A series of 4-tuples:
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242 (markup, encoding, declared encoding,
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243 has undergone character replacement)
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244
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245 Each 4-tuple represents a strategy for converting the
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246 document to Unicode and parsing it. Each strategy will be tried
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247 in turn.
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248
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249 By default, the only strategy is to parse the markup
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250 as-is. See `LXMLTreeBuilderForXML` and
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251 `HTMLParserTreeBuilder` for implementations that take into
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252 account the quirks of particular parsers.
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253 """
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254 yield markup, None, None, False
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255
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256 def test_fragment_to_document(self, fragment):
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257 """Wrap an HTML fragment to make it look like a document.
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258
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259 Different parsers do this differently. For instance, lxml
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260 introduces an empty <head> tag, and html5lib
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261 doesn't. Abstracting this away lets us write simple tests
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262 which run HTML fragments through the parser and compare the
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263 results against other HTML fragments.
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264
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265 This method should not be used outside of tests.
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266
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267 :param fragment: A string -- fragment of HTML.
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268 :return: A string -- a full HTML document.
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269 """
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270 return fragment
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271
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272 def set_up_substitutions(self, tag):
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273 """Set up any substitutions that will need to be performed on
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274 a `Tag` when it's output as a string.
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275
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276 By default, this does nothing. See `HTMLTreeBuilder` for a
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277 case where this is used.
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278
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279 :param tag: A `Tag`
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280 :return: Whether or not a substitution was performed.
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281 """
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282 return False
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283
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284 def _replace_cdata_list_attribute_values(self, tag_name, attrs):
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285 """When an attribute value is associated with a tag that can
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286 have multiple values for that attribute, convert the string
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287 value to a list of strings.
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288
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289 Basically, replaces class="foo bar" with class=["foo", "bar"]
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290
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291 NOTE: This method modifies its input in place.
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292
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293 :param tag_name: The name of a tag.
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294 :param attrs: A dictionary containing the tag's attributes.
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295 Any appropriate attribute values will be modified in place.
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296 """
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297 if not attrs:
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298 return attrs
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299 if self.cdata_list_attributes:
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300 universal = self.cdata_list_attributes.get('*', [])
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301 tag_specific = self.cdata_list_attributes.get(
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302 tag_name.lower(), None)
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303 for attr in list(attrs.keys()):
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304 if attr in universal or (tag_specific and attr in tag_specific):
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305 # We have a "class"-type attribute whose string
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306 # value is a whitespace-separated list of
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307 # values. Split it into a list.
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308 value = attrs[attr]
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309 if isinstance(value, str):
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310 values = nonwhitespace_re.findall(value)
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311 else:
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312 # html5lib sometimes calls setAttributes twice
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313 # for the same tag when rearranging the parse
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314 # tree. On the second call the attribute value
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315 # here is already a list. If this happens,
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316 # leave the value alone rather than trying to
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317 # split it again.
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318 values = value
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319 attrs[attr] = values
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320 return attrs
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321
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322 class SAXTreeBuilder(TreeBuilder):
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323 """A Beautiful Soup treebuilder that listens for SAX events.
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324
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325 This is not currently used for anything, but it demonstrates
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326 how a simple TreeBuilder would work.
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327 """
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328
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329 def feed(self, markup):
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330 raise NotImplementedError()
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331
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332 def close(self):
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333 pass
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334
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335 def startElement(self, name, attrs):
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336 attrs = dict((key[1], value) for key, value in list(attrs.items()))
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337 #print("Start %s, %r" % (name, attrs))
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338 self.soup.handle_starttag(name, attrs)
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339
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340 def endElement(self, name):
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341 #print("End %s" % name)
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342 self.soup.handle_endtag(name)
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343
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344 def startElementNS(self, nsTuple, nodeName, attrs):
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345 # Throw away (ns, nodeName) for now.
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346 self.startElement(nodeName, attrs)
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347
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348 def endElementNS(self, nsTuple, nodeName):
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349 # Throw away (ns, nodeName) for now.
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350 self.endElement(nodeName)
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351 #handler.endElementNS((ns, node.nodeName), node.nodeName)
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352
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353 def startPrefixMapping(self, prefix, nodeValue):
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354 # Ignore the prefix for now.
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355 pass
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356
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357 def endPrefixMapping(self, prefix):
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358 # Ignore the prefix for now.
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359 # handler.endPrefixMapping(prefix)
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360 pass
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361
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362 def characters(self, content):
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363 self.soup.handle_data(content)
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364
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365 def startDocument(self):
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366 pass
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367
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368 def endDocument(self):
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369 pass
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370
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371
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372 class HTMLTreeBuilder(TreeBuilder):
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373 """This TreeBuilder knows facts about HTML.
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374
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375 Such as which tags are empty-element tags.
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376 """
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377
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378 empty_element_tags = set([
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379 # These are from HTML5.
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380 'area', 'base', 'br', 'col', 'embed', 'hr', 'img', 'input', 'keygen', 'link', 'menuitem', 'meta', 'param', 'source', 'track', 'wbr',
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381
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382 # These are from earlier versions of HTML and are removed in HTML5.
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383 'basefont', 'bgsound', 'command', 'frame', 'image', 'isindex', 'nextid', 'spacer'
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384 ])
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385
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386 # The HTML standard defines these as block-level elements. Beautiful
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387 # Soup does not treat these elements differently from other elements,
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388 # but it may do so eventually, and this information is available if
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389 # you need to use it.
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390 block_elements = set(["address", "article", "aside", "blockquote", "canvas", "dd", "div", "dl", "dt", "fieldset", "figcaption", "figure", "footer", "form", "h1", "h2", "h3", "h4", "h5", "h6", "header", "hr", "li", "main", "nav", "noscript", "ol", "output", "p", "pre", "section", "table", "tfoot", "ul", "video"])
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391
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392 # The HTML standard defines an unusual content model for these tags.
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393 # We represent this by using a string class other than NavigableString
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394 # inside these tags.
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395 #
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396 # I made this list by going through the HTML spec
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diff changeset
397 # (https://html.spec.whatwg.org/#metadata-content) and looking for
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398 # "metadata content" elements that can contain strings.
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399 #
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400 # TODO: Arguably <noscript> could go here but it seems
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401 # qualitatively different from the other tags.
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402 DEFAULT_STRING_CONTAINERS = {
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403 'style': Stylesheet,
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404 'script': Script,
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405 'template': TemplateString,
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406 }
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407
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408 # The HTML standard defines these attributes as containing a
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409 # space-separated list of values, not a single value. That is,
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410 # class="foo bar" means that the 'class' attribute has two values,
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411 # 'foo' and 'bar', not the single value 'foo bar'. When we
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412 # encounter one of these attributes, we will parse its value into
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413 # a list of values if possible. Upon output, the list will be
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414 # converted back into a string.
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415 DEFAULT_CDATA_LIST_ATTRIBUTES = {
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416 "*" : ['class', 'accesskey', 'dropzone'],
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417 "a" : ['rel', 'rev'],
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418 "link" : ['rel', 'rev'],
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419 "td" : ["headers"],
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420 "th" : ["headers"],
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421 "td" : ["headers"],
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422 "form" : ["accept-charset"],
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423 "object" : ["archive"],
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424
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425 # These are HTML5 specific, as are *.accesskey and *.dropzone above.
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426 "area" : ["rel"],
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427 "icon" : ["sizes"],
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428 "iframe" : ["sandbox"],
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429 "output" : ["for"],
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430 }
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431
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432 DEFAULT_PRESERVE_WHITESPACE_TAGS = set(['pre', 'textarea'])
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433
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434 def set_up_substitutions(self, tag):
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435 """Replace the declared encoding in a <meta> tag with a placeholder,
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436 to be substituted when the tag is output to a string.
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437
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438 An HTML document may come in to Beautiful Soup as one
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439 encoding, but exit in a different encoding, and the <meta> tag
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440 needs to be changed to reflect this.
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441
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442 :param tag: A `Tag`
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443 :return: Whether or not a substitution was performed.
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444 """
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445 # We are only interested in <meta> tags
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446 if tag.name != 'meta':
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447 return False
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448
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449 http_equiv = tag.get('http-equiv')
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450 content = tag.get('content')
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451 charset = tag.get('charset')
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452
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453 # We are interested in <meta> tags that say what encoding the
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454 # document was originally in. This means HTML 5-style <meta>
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455 # tags that provide the "charset" attribute. It also means
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456 # HTML 4-style <meta> tags that provide the "content"
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457 # attribute and have "http-equiv" set to "content-type".
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458 #
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459 # In both cases we will replace the value of the appropriate
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460 # attribute with a standin object that can take on any
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461 # encoding.
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462 meta_encoding = None
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463 if charset is not None:
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464 # HTML 5 style:
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465 # <meta charset="utf8">
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466 meta_encoding = charset
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467 tag['charset'] = CharsetMetaAttributeValue(charset)
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468
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469 elif (content is not None and http_equiv is not None
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470 and http_equiv.lower() == 'content-type'):
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471 # HTML 4 style:
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472 # <meta http-equiv="content-type" content="text/html; charset=utf8">
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473 tag['content'] = ContentMetaAttributeValue(content)
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474
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475 return (meta_encoding is not None)
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476
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477 def register_treebuilders_from(module):
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478 """Copy TreeBuilders from the given module into this module."""
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479 # I'm fairly sure this is not the best way to do this.
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480 this_module = sys.modules['bs4.builder']
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481 for name in module.__all__:
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482 obj = getattr(module, name)
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483
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484 if issubclass(obj, TreeBuilder):
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485 setattr(this_module, name, obj)
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486 this_module.__all__.append(name)
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487 # Register the builder while we're at it.
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488 this_module.builder_registry.register(obj)
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489
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490 class ParserRejectedMarkup(Exception):
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491 """An Exception to be raised when the underlying parser simply
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492 refuses to parse the given markup.
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493 """
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494 def __init__(self, message_or_exception):
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495 """Explain why the parser rejected the given markup, either
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496 with a textual explanation or another exception.
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497 """
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498 if isinstance(message_or_exception, Exception):
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499 e = message_or_exception
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500 message_or_exception = "%s: %s" % (e.__class__.__name__, str(e))
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501 super(ParserRejectedMarkup, self).__init__(message_or_exception)
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502
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503 # Builders are registered in reverse order of priority, so that custom
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504 # builder registrations will take precedence. In general, we want lxml
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505 # to take precedence over html5lib, because it's faster. And we only
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506 # want to use HTMLParser as a last resort.
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507 from . import _htmlparser
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508 register_treebuilders_from(_htmlparser)
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509 try:
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510 from . import _html5lib
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511 register_treebuilders_from(_html5lib)
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512 except ImportError:
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513 # They don't have html5lib installed.
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514 pass
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515 try:
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516 from . import _lxml
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517 register_treebuilders_from(_lxml)
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518 except ImportError:
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519 # They don't have lxml installed.
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520 pass