Mercurial > repos > guerler > springsuite

annotate planemo/lib/python3.7/site-packages/lxml/html/html5parser.py @ 1:56ad4e20f292 draft

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"planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
author guerler
date Fri, 31 Jul 2020 00:32:28 -0400
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1
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1 """
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2 An interface to html5lib that mimics the lxml.html interface.
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3 """
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4 import sys
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5 import string
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6
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7 from html5lib import HTMLParser as _HTMLParser
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8 from html5lib.treebuilders.etree_lxml import TreeBuilder
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9 from lxml import etree
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10 from lxml.html import Element, XHTML_NAMESPACE, _contains_block_level_tag
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11
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12 # python3 compatibility
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13 try:
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14 _strings = basestring
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15 except NameError:
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16 _strings = (bytes, str)
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17 try:
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18 from urllib2 import urlopen
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19 except ImportError:
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20 from urllib.request import urlopen
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21 try:
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22 from urlparse import urlparse
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23 except ImportError:
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24 from urllib.parse import urlparse
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25
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26
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27 class HTMLParser(_HTMLParser):
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28 """An html5lib HTML parser with lxml as tree."""
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29
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30 def __init__(self, strict=False, **kwargs):
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31 _HTMLParser.__init__(self, strict=strict, tree=TreeBuilder, **kwargs)
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32
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33
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34 try:
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35 from html5lib import XHTMLParser as _XHTMLParser
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36 except ImportError:
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37 pass
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38 else:
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39 class XHTMLParser(_XHTMLParser):
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40 """An html5lib XHTML Parser with lxml as tree."""
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41
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42 def __init__(self, strict=False, **kwargs):
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43 _XHTMLParser.__init__(self, strict=strict, tree=TreeBuilder, **kwargs)
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44
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45 xhtml_parser = XHTMLParser()
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46
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47
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48 def _find_tag(tree, tag):
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49 elem = tree.find(tag)
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50 if elem is not None:
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51 return elem
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52 return tree.find('{%s}%s' % (XHTML_NAMESPACE, tag))
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53
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54
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55 def document_fromstring(html, guess_charset=None, parser=None):
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56 """
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57 Parse a whole document into a string.
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58
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59 If `guess_charset` is true, or if the input is not Unicode but a
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60 byte string, the `chardet` library will perform charset guessing
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61 on the string.
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62 """
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63 if not isinstance(html, _strings):
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64 raise TypeError('string required')
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65
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66 if parser is None:
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67 parser = html_parser
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68
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69 options = {}
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70 if guess_charset is None and isinstance(html, bytes):
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71 # html5lib does not accept useChardet as an argument, if it
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72 # detected the html argument would produce unicode objects.
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73 guess_charset = True
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74 if guess_charset is not None:
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75 options['useChardet'] = guess_charset
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76 return parser.parse(html, **options).getroot()
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77
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78
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79 def fragments_fromstring(html, no_leading_text=False,
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80 guess_charset=None, parser=None):
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81 """Parses several HTML elements, returning a list of elements.
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82
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83 The first item in the list may be a string. If no_leading_text is true,
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84 then it will be an error if there is leading text, and it will always be
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85 a list of only elements.
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86
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87 If `guess_charset` is true, the `chardet` library will perform charset
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88 guessing on the string.
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89 """
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90 if not isinstance(html, _strings):
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91 raise TypeError('string required')
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92
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93 if parser is None:
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94 parser = html_parser
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95
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96 options = {}
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97 if guess_charset is None and isinstance(html, bytes):
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98 # html5lib does not accept useChardet as an argument, if it
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99 # detected the html argument would produce unicode objects.
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100 guess_charset = False
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101 if guess_charset is not None:
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102 options['useChardet'] = guess_charset
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103 children = parser.parseFragment(html, 'div', **options)
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104 if children and isinstance(children[0], _strings):
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105 if no_leading_text:
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106 if children[0].strip():
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107 raise etree.ParserError('There is leading text: %r' %
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108 children[0])
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109 del children[0]
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110 return children
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111
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112
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113 def fragment_fromstring(html, create_parent=False,
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114 guess_charset=None, parser=None):
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115 """Parses a single HTML element; it is an error if there is more than
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116 one element, or if anything but whitespace precedes or follows the
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117 element.
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118
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119 If 'create_parent' is true (or is a tag name) then a parent node
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120 will be created to encapsulate the HTML in a single element. In
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121 this case, leading or trailing text is allowed.
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122
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123 If `guess_charset` is true, the `chardet` library will perform charset
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124 guessing on the string.
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125 """
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126 if not isinstance(html, _strings):
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127 raise TypeError('string required')
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128
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129 accept_leading_text = bool(create_parent)
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130
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131 elements = fragments_fromstring(
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132 html, guess_charset=guess_charset, parser=parser,
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133 no_leading_text=not accept_leading_text)
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134
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135 if create_parent:
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136 if not isinstance(create_parent, _strings):
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137 create_parent = 'div'
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138 new_root = Element(create_parent)
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139 if elements:
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140 if isinstance(elements[0], _strings):
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141 new_root.text = elements[0]
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142 del elements[0]
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143 new_root.extend(elements)
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144 return new_root
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145
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146 if not elements:
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147 raise etree.ParserError('No elements found')
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148 if len(elements) > 1:
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149 raise etree.ParserError('Multiple elements found')
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150 result = elements[0]
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151 if result.tail and result.tail.strip():
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152 raise etree.ParserError('Element followed by text: %r' % result.tail)
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153 result.tail = None
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154 return result
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155
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156
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157 def fromstring(html, guess_charset=None, parser=None):
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158 """Parse the html, returning a single element/document.
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159
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160 This tries to minimally parse the chunk of text, without knowing if it
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161 is a fragment or a document.
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162
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163 'base_url' will set the document's base_url attribute (and the tree's
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164 docinfo.URL)
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165
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166 If `guess_charset` is true, or if the input is not Unicode but a
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167 byte string, the `chardet` library will perform charset guessing
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168 on the string.
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169 """
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170 if not isinstance(html, _strings):
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171 raise TypeError('string required')
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172 doc = document_fromstring(html, parser=parser,
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173 guess_charset=guess_charset)
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174
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175 # document starts with doctype or <html>, full document!
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176 start = html[:50]
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177 if isinstance(start, bytes):
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178 # Allow text comparison in python3.
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179 # Decode as ascii, that also covers latin-1 and utf-8 for the
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180 # characters we need.
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181 start = start.decode('ascii', 'replace')
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182
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183 start = start.lstrip().lower()
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184 if start.startswith('<html') or start.startswith('<!doctype'):
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185 return doc
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186
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187 head = _find_tag(doc, 'head')
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188
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189 # if the head is not empty we have a full document
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190 if len(head):
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191 return doc
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192
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193 body = _find_tag(doc, 'body')
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194
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195 # The body has just one element, so it was probably a single
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196 # element passed in
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197 if (len(body) == 1 and (not body.text or not body.text.strip())
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198 and (not body[-1].tail or not body[-1].tail.strip())):
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199 return body[0]
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200
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201 # Now we have a body which represents a bunch of tags which have the
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202 # content that was passed in. We will create a fake container, which
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203 # is the body tag, except <body> implies too much structure.
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204 if _contains_block_level_tag(body):
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205 body.tag = 'div'
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206 else:
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207 body.tag = 'span'
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208 return body
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209
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210
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211 def parse(filename_url_or_file, guess_charset=None, parser=None):
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212 """Parse a filename, URL, or file-like object into an HTML document
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213 tree. Note: this returns a tree, not an element. Use
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214 ``parse(...).getroot()`` to get the document root.
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215
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216 If ``guess_charset`` is true, the ``useChardet`` option is passed into
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217 html5lib to enable character detection. This option is on by default
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218 when parsing from URLs, off by default when parsing from file(-like)
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219 objects (which tend to return Unicode more often than not), and on by
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220 default when parsing from a file path (which is read in binary mode).
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221 """
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222 if parser is None:
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223 parser = html_parser
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224 if not isinstance(filename_url_or_file, _strings):
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225 fp = filename_url_or_file
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226 if guess_charset is None:
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227 # assume that file-like objects return Unicode more often than bytes
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228 guess_charset = False
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229 elif _looks_like_url(filename_url_or_file):
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230 fp = urlopen(filename_url_or_file)
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231 if guess_charset is None:
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232 # assume that URLs return bytes
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233 guess_charset = True
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234 else:
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235 fp = open(filename_url_or_file, 'rb')
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236 if guess_charset is None:
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237 guess_charset = True
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238
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239 options = {}
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240 # html5lib does not accept useChardet as an argument, if it
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241 # detected the html argument would produce unicode objects.
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242 if guess_charset:
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243 options['useChardet'] = guess_charset
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244 return parser.parse(fp, **options)
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245
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246
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247 def _looks_like_url(str):
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248 scheme = urlparse(str)[0]
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249 if not scheme:
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250 return False
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251 elif (sys.platform == 'win32' and
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252 scheme in string.ascii_letters
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253 and len(scheme) == 1):
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254 # looks like a 'normal' absolute path
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255 return False
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256 else:
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257 return True
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258
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259
56ad4e20f292 "planemo upload commit 6eee67778febed82ddd413c3ca40b3183a3898f1"
guerler
parents:
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260 html_parser = HTMLParser()