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annotate planemo/lib/python3.7/site-packages/bs4/builder/_htmlparser.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
parents d30785e31577
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1 # encoding: utf-8
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2 """Use the HTMLParser library to parse HTML files that aren't too bad."""
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3
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4 # Use of this source code is governed by the MIT license.
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5 __license__ = "MIT"
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6
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7 __all__ = [
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8 'HTMLParserTreeBuilder',
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9 ]
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10
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11 from html.parser import HTMLParser
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12
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13 try:
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14 from html.parser import HTMLParseError
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15 except ImportError as e:
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16 # HTMLParseError is removed in Python 3.5. Since it can never be
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17 # thrown in 3.5, we can just define our own class as a placeholder.
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18 class HTMLParseError(Exception):
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19 pass
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20
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21 import sys
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22 import warnings
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23
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24 # Starting in Python 3.2, the HTMLParser constructor takes a 'strict'
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25 # argument, which we'd like to set to False. Unfortunately,
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26 # http://bugs.python.org/issue13273 makes strict=True a better bet
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27 # before Python 3.2.3.
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28 #
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29 # At the end of this file, we monkeypatch HTMLParser so that
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30 # strict=True works well on Python 3.2.2.
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31 major, minor, release = sys.version_info[:3]
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32 CONSTRUCTOR_TAKES_STRICT = major == 3 and minor == 2 and release >= 3
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33 CONSTRUCTOR_STRICT_IS_DEPRECATED = major == 3 and minor == 3
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34 CONSTRUCTOR_TAKES_CONVERT_CHARREFS = major == 3 and minor >= 4
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35
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36
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37 from bs4.element import (
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38 CData,
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39 Comment,
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40 Declaration,
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41 Doctype,
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42 ProcessingInstruction,
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43 )
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44 from bs4.dammit import EntitySubstitution, UnicodeDammit
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45
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46 from bs4.builder import (
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47 HTML,
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48 HTMLTreeBuilder,
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49 STRICT,
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50 )
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51
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52
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53 HTMLPARSER = 'html.parser'
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54
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55 class BeautifulSoupHTMLParser(HTMLParser):
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56 """A subclass of the Python standard library's HTMLParser class, which
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57 listens for HTMLParser events and translates them into calls
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58 to Beautiful Soup's tree construction API.
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59 """
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60
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61 # Strategies for handling duplicate attributes
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62 IGNORE = 'ignore'
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63 REPLACE = 'replace'
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64
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65 def __init__(self, *args, **kwargs):
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66 """Constructor.
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67
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68 :param on_duplicate_attribute: A strategy for what to do if a
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69 tag includes the same attribute more than once. Accepted
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70 values are: REPLACE (replace earlier values with later
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71 ones, the default), IGNORE (keep the earliest value
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72 encountered), or a callable. A callable must take three
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73 arguments: the dictionary of attributes already processed,
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74 the name of the duplicate attribute, and the most recent value
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75 encountered.
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76 """
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77 self.on_duplicate_attribute = kwargs.pop(
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78 'on_duplicate_attribute', self.REPLACE
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79 )
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80 HTMLParser.__init__(self, *args, **kwargs)
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81
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82 # Keep a list of empty-element tags that were encountered
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83 # without an explicit closing tag. If we encounter a closing tag
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84 # of this type, we'll associate it with one of those entries.
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85 #
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86 # This isn't a stack because we don't care about the
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87 # order. It's a list of closing tags we've already handled and
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88 # will ignore, assuming they ever show up.
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89 self.already_closed_empty_element = []
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90
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91 def error(self, msg):
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92 """In Python 3, HTMLParser subclasses must implement error(), although
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93 this requirement doesn't appear to be documented.
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94
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95 In Python 2, HTMLParser implements error() by raising an exception,
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96 which we don't want to do.
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97
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98 In any event, this method is called only on very strange
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99 markup and our best strategy is to pretend it didn't happen
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100 and keep going.
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101 """
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102 warnings.warn(msg)
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103
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104 def handle_startendtag(self, name, attrs):
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105 """Handle an incoming empty-element tag.
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106
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107 This is only called when the markup looks like <tag/>.
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108
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109 :param name: Name of the tag.
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110 :param attrs: Dictionary of the tag's attributes.
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111 """
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112 # is_startend() tells handle_starttag not to close the tag
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113 # just because its name matches a known empty-element tag. We
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114 # know that this is an empty-element tag and we want to call
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115 # handle_endtag ourselves.
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116 tag = self.handle_starttag(name, attrs, handle_empty_element=False)
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117 self.handle_endtag(name)
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118
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119 def handle_starttag(self, name, attrs, handle_empty_element=True):
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120 """Handle an opening tag, e.g. '<tag>'
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121
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122 :param name: Name of the tag.
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123 :param attrs: Dictionary of the tag's attributes.
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124 :param handle_empty_element: True if this tag is known to be
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125 an empty-element tag (i.e. there is not expected to be any
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126 closing tag).
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127 """
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128 # XXX namespace
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129 attr_dict = {}
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130 for key, value in attrs:
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131 # Change None attribute values to the empty string
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132 # for consistency with the other tree builders.
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133 if value is None:
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134 value = ''
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135 if key in attr_dict:
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136 # A single attribute shows up multiple times in this
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137 # tag. How to handle it depends on the
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138 # on_duplicate_attribute setting.
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139 on_dupe = self.on_duplicate_attribute
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140 if on_dupe == self.IGNORE:
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141 pass
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142 elif on_dupe in (None, self.REPLACE):
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143 attr_dict[key] = value
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144 else:
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145 on_dupe(attr_dict, key, value)
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146 else:
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147 attr_dict[key] = value
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148 attrvalue = '""'
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149 #print("START", name)
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150 sourceline, sourcepos = self.getpos()
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151 tag = self.soup.handle_starttag(
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152 name, None, None, attr_dict, sourceline=sourceline,
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153 sourcepos=sourcepos
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154 )
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155 if tag and tag.is_empty_element and handle_empty_element:
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156 # Unlike other parsers, html.parser doesn't send separate end tag
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157 # events for empty-element tags. (It's handled in
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158 # handle_startendtag, but only if the original markup looked like
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159 # <tag/>.)
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160 #
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161 # So we need to call handle_endtag() ourselves. Since we
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162 # know the start event is identical to the end event, we
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163 # don't want handle_endtag() to cross off any previous end
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164 # events for tags of this name.
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165 self.handle_endtag(name, check_already_closed=False)
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166
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167 # But we might encounter an explicit closing tag for this tag
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168 # later on. If so, we want to ignore it.
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169 self.already_closed_empty_element.append(name)
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170
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171 def handle_endtag(self, name, check_already_closed=True):
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172 """Handle a closing tag, e.g. '</tag>'
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173
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174 :param name: A tag name.
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175 :param check_already_closed: True if this tag is expected to
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176 be the closing portion of an empty-element tag,
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177 e.g. '<tag></tag>'.
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178 """
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179 #print("END", name)
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180 if check_already_closed and name in self.already_closed_empty_element:
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181 # This is a redundant end tag for an empty-element tag.
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182 # We've already called handle_endtag() for it, so just
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183 # check it off the list.
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184 # print("ALREADY CLOSED", name)
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185 self.already_closed_empty_element.remove(name)
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186 else:
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187 self.soup.handle_endtag(name)
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188
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189 def handle_data(self, data):
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190 """Handle some textual data that shows up between tags."""
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191 self.soup.handle_data(data)
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192
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193 def handle_charref(self, name):
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194 """Handle a numeric character reference by converting it to the
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195 corresponding Unicode character and treating it as textual
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196 data.
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197
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198 :param name: Character number, possibly in hexadecimal.
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199 """
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200 # XXX workaround for a bug in HTMLParser. Remove this once
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201 # it's fixed in all supported versions.
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202 # http://bugs.python.org/issue13633
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203 if name.startswith('x'):
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204 real_name = int(name.lstrip('x'), 16)
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205 elif name.startswith('X'):
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206 real_name = int(name.lstrip('X'), 16)
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207 else:
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208 real_name = int(name)
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209
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210 data = None
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211 if real_name < 256:
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212 # HTML numeric entities are supposed to reference Unicode
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213 # code points, but sometimes they reference code points in
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214 # some other encoding (ahem, Windows-1252). E.g. &#147;
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215 # instead of &#201; for LEFT DOUBLE QUOTATION MARK. This
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216 # code tries to detect this situation and compensate.
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217 for encoding in (self.soup.original_encoding, 'windows-1252'):
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218 if not encoding:
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219 continue
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220 try:
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221 data = bytearray([real_name]).decode(encoding)
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222 except UnicodeDecodeError as e:
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223 pass
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224 if not data:
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225 try:
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226 data = chr(real_name)
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227 except (ValueError, OverflowError) as e:
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228 pass
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229 data = data or "\N{REPLACEMENT CHARACTER}"
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230 self.handle_data(data)
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231
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232 def handle_entityref(self, name):
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233 """Handle a named entity reference by converting it to the
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234 corresponding Unicode character and treating it as textual
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235 data.
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236
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237 :param name: Name of the entity reference.
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238 """
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239 character = EntitySubstitution.HTML_ENTITY_TO_CHARACTER.get(name)
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240 if character is not None:
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241 data = character
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242 else:
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243 # If this were XML, it would be ambiguous whether "&foo"
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244 # was an character entity reference with a missing
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245 # semicolon or the literal string "&foo". Since this is
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246 # HTML, we have a complete list of all character entity references,
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247 # and this one wasn't found, so assume it's the literal string "&foo".
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248 data = "&%s" % name
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249 self.handle_data(data)
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250
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251 def handle_comment(self, data):
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252 """Handle an HTML comment.
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253
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254 :param data: The text of the comment.
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255 """
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256 self.soup.endData()
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257 self.soup.handle_data(data)
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258 self.soup.endData(Comment)
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259
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260 def handle_decl(self, data):
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261 """Handle a DOCTYPE declaration.
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262
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263 :param data: The text of the declaration.
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264 """
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265 self.soup.endData()
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266 data = data[len("DOCTYPE "):]
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267 self.soup.handle_data(data)
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268 self.soup.endData(Doctype)
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269
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270 def unknown_decl(self, data):
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271 """Handle a declaration of unknown type -- probably a CDATA block.
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272
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273 :param data: The text of the declaration.
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274 """
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275 if data.upper().startswith('CDATA['):
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276 cls = CData
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277 data = data[len('CDATA['):]
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278 else:
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279 cls = Declaration
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280 self.soup.endData()
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281 self.soup.handle_data(data)
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282 self.soup.endData(cls)
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283
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284 def handle_pi(self, data):
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285 """Handle a processing instruction.
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286
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287 :param data: The text of the instruction.
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288 """
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289 self.soup.endData()
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290 self.soup.handle_data(data)
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291 self.soup.endData(ProcessingInstruction)
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292
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293
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294 class HTMLParserTreeBuilder(HTMLTreeBuilder):
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295 """A Beautiful soup `TreeBuilder` that uses the `HTMLParser` parser,
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296 found in the Python standard library.
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297 """
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298 is_xml = False
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299 picklable = True
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300 NAME = HTMLPARSER
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301 features = [NAME, HTML, STRICT]
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302
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303 # The html.parser knows which line number and position in the
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304 # original file is the source of an element.
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305 TRACKS_LINE_NUMBERS = True
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306
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307 def __init__(self, parser_args=None, parser_kwargs=None, **kwargs):
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308 """Constructor.
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309
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310 :param parser_args: Positional arguments to pass into
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311 the BeautifulSoupHTMLParser constructor, once it's
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312 invoked.
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313 :param parser_kwargs: Keyword arguments to pass into
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314 the BeautifulSoupHTMLParser constructor, once it's
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315 invoked.
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316 :param kwargs: Keyword arguments for the superclass constructor.
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317 """
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318 # Some keyword arguments will be pulled out of kwargs and placed
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319 # into parser_kwargs.
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320 extra_parser_kwargs = dict()
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321 for arg in ('on_duplicate_attribute',):
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322 if arg in kwargs:
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323 value = kwargs.pop(arg)
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324 extra_parser_kwargs[arg] = value
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325 super(HTMLParserTreeBuilder, self).__init__(**kwargs)
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326 parser_args = parser_args or []
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327 parser_kwargs = parser_kwargs or {}
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328 parser_kwargs.update(extra_parser_kwargs)
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329 if CONSTRUCTOR_TAKES_STRICT and not CONSTRUCTOR_STRICT_IS_DEPRECATED:
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330 parser_kwargs['strict'] = False
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331 if CONSTRUCTOR_TAKES_CONVERT_CHARREFS:
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332 parser_kwargs['convert_charrefs'] = False
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333 self.parser_args = (parser_args, parser_kwargs)
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334
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335 def prepare_markup(self, markup, user_specified_encoding=None,
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336 document_declared_encoding=None, exclude_encodings=None):
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337
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338 """Run any preliminary steps necessary to make incoming markup
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339 acceptable to the parser.
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340
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341 :param markup: Some markup -- probably a bytestring.
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342 :param user_specified_encoding: The user asked to try this encoding.
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343 :param document_declared_encoding: The markup itself claims to be
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344 in this encoding.
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345 :param exclude_encodings: The user asked _not_ to try any of
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346 these encodings.
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347
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348 :yield: A series of 4-tuples:
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349 (markup, encoding, declared encoding,
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350 has undergone character replacement)
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351
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352 Each 4-tuple represents a strategy for converting the
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353 document to Unicode and parsing it. Each strategy will be tried
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354 in turn.
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355 """
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356 if isinstance(markup, str):
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357 # Parse Unicode as-is.
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358 yield (markup, None, None, False)
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359 return
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360
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361 # Ask UnicodeDammit to sniff the most likely encoding.
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362 try_encodings = [user_specified_encoding, document_declared_encoding]
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363 dammit = UnicodeDammit(markup, try_encodings, is_html=True,
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364 exclude_encodings=exclude_encodings)
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365 yield (dammit.markup, dammit.original_encoding,
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366 dammit.declared_html_encoding,
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367 dammit.contains_replacement_characters)
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368
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369 def feed(self, markup):
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370 """Run some incoming markup through some parsing process,
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371 populating the `BeautifulSoup` object in self.soup.
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372 """
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373 args, kwargs = self.parser_args
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374 parser = BeautifulSoupHTMLParser(*args, **kwargs)
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375 parser.soup = self.soup
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376 try:
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377 parser.feed(markup)
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378 parser.close()
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379 except HTMLParseError as e:
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380 warnings.warn(RuntimeWarning(
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381 "Python's built-in HTMLParser cannot parse the given document. This is not a bug in Beautiful Soup. The best solution is to install an external parser (lxml or html5lib), and use Beautiful Soup with that parser. See http://www.crummy.com/software/BeautifulSoup/bs4/doc/#installing-a-parser for help."))
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382 raise e
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383 parser.already_closed_empty_element = []
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384
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385 # Patch 3.2 versions of HTMLParser earlier than 3.2.3 to use some
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386 # 3.2.3 code. This ensures they don't treat markup like <p></p> as a
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387 # string.
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388 #
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389 # XXX This code can be removed once most Python 3 users are on 3.2.3.
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390 if major == 3 and minor == 2 and not CONSTRUCTOR_TAKES_STRICT:
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391 import re
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392 attrfind_tolerant = re.compile(
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393 r'\s*((?<=[\'"\s])[^\s/>][^\s/=>]*)(\s*=+\s*'
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394 r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?')
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395 HTMLParserTreeBuilder.attrfind_tolerant = attrfind_tolerant
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396
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397 locatestarttagend = re.compile(r"""
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398 <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
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399 (?:\s+ # whitespace before attribute name
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400 (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
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401 (?:\s*=\s* # value indicator
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402 (?:'[^']*' # LITA-enclosed value
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403 |\"[^\"]*\" # LIT-enclosed value
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404 |[^'\">\s]+ # bare value
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405 )
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406 )?
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407 )
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408 )*
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409 \s* # trailing whitespace
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410 """, re.VERBOSE)
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411 BeautifulSoupHTMLParser.locatestarttagend = locatestarttagend
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412
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413 from html.parser import tagfind, attrfind
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414
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415 def parse_starttag(self, i):
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416 self.__starttag_text = None
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417 endpos = self.check_for_whole_start_tag(i)
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418 if endpos < 0:
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419 return endpos
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420 rawdata = self.rawdata
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421 self.__starttag_text = rawdata[i:endpos]
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422
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423 # Now parse the data between i+1 and j into a tag and attrs
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424 attrs = []
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425 match = tagfind.match(rawdata, i+1)
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426 assert match, 'unexpected call to parse_starttag()'
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427 k = match.end()
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428 self.lasttag = tag = rawdata[i+1:k].lower()
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429 while k < endpos:
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430 if self.strict:
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431 m = attrfind.match(rawdata, k)
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432 else:
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433 m = attrfind_tolerant.match(rawdata, k)
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434 if not m:
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435 break
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436 attrname, rest, attrvalue = m.group(1, 2, 3)
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437 if not rest:
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438 attrvalue = None
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439 elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
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440 attrvalue[:1] == '"' == attrvalue[-1:]:
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441 attrvalue = attrvalue[1:-1]
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442 if attrvalue:
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443 attrvalue = self.unescape(attrvalue)
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444 attrs.append((attrname.lower(), attrvalue))
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445 k = m.end()
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446
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447 end = rawdata[k:endpos].strip()
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448 if end not in (">", "/>"):
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449 lineno, offset = self.getpos()
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450 if "\n" in self.__starttag_text:
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451 lineno = lineno + self.__starttag_text.count("\n")
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452 offset = len(self.__starttag_text) \
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453 - self.__starttag_text.rfind("\n")
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454 else:
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455 offset = offset + len(self.__starttag_text)
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456 if self.strict:
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457 self.error("junk characters in start tag: %r"
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458 % (rawdata[k:endpos][:20],))
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459 self.handle_data(rawdata[i:endpos])
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460 return endpos
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461 if end.endswith('/>'):
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462 # XHTML-style empty tag: <span attr="value" />
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463 self.handle_startendtag(tag, attrs)
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464 else:
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465 self.handle_starttag(tag, attrs)
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466 if tag in self.CDATA_CONTENT_ELEMENTS:
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467 self.set_cdata_mode(tag)
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468 return endpos
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469
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470 def set_cdata_mode(self, elem):
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471 self.cdata_elem = elem.lower()
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472 self.interesting = re.compile(r'</\s*%s\s*>' % self.cdata_elem, re.I)
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473
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474 BeautifulSoupHTMLParser.parse_starttag = parse_starttag
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475 BeautifulSoupHTMLParser.set_cdata_mode = set_cdata_mode
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476
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477 CONSTRUCTOR_TAKES_STRICT = True