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jpayne@68
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1 """A parser for HTML and XHTML."""
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jpayne@68
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2
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3 # This file is based on sgmllib.py, but the API is slightly different.
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4
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5 # XXX There should be a way to distinguish between PCDATA (parsed
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6 # character data -- the normal case), RCDATA (replaceable character
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7 # data -- only char and entity references and end tags are special)
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8 # and CDATA (character data -- only end tags are special).
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9
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10
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11 import re
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12 import warnings
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13 import _markupbase
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14
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15 from html import unescape
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16
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17
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18 __all__ = ['HTMLParser']
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19
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20 # Regular expressions used for parsing
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21
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22 interesting_normal = re.compile('[&<]')
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23 incomplete = re.compile('&[a-zA-Z#]')
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24
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25 entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]')
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26 charref = re.compile('&#(?:[0-9]+|[xX][0-9a-fA-F]+)[^0-9a-fA-F]')
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27
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28 starttagopen = re.compile('<[a-zA-Z]')
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29 piclose = re.compile('>')
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30 commentclose = re.compile(r'--\s*>')
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jpayne@68
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31 # Note:
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32 # 1) if you change tagfind/attrfind remember to update locatestarttagend too;
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33 # 2) if you change tagfind/attrfind and/or locatestarttagend the parser will
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34 # explode, so don't do it.
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35 # see http://www.w3.org/TR/html5/tokenization.html#tag-open-state
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36 # and http://www.w3.org/TR/html5/tokenization.html#tag-name-state
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37 tagfind_tolerant = re.compile(r'([a-zA-Z][^\t\n\r\f />\x00]*)(?:\s|/(?!>))*')
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38 attrfind_tolerant = re.compile(
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39 r'((?<=[\'"\s/])[^\s/>][^\s/=>]*)(\s*=+\s*'
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40 r'(\'[^\']*\'|"[^"]*"|(?![\'"])[^>\s]*))?(?:\s|/(?!>))*')
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41 locatestarttagend_tolerant = re.compile(r"""
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42 <[a-zA-Z][^\t\n\r\f />\x00]* # tag name
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43 (?:[\s/]* # optional whitespace before attribute name
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44 (?:(?<=['"\s/])[^\s/>][^\s/=>]* # attribute name
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45 (?:\s*=+\s* # value indicator
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46 (?:'[^']*' # LITA-enclosed value
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47 |"[^"]*" # LIT-enclosed value
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48 |(?!['"])[^>\s]* # bare value
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49 )
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50 (?:\s*,)* # possibly followed by a comma
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51 )?(?:\s|/(?!>))*
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52 )*
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53 )?
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54 \s* # trailing whitespace
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55 """, re.VERBOSE)
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56 endendtag = re.compile('>')
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57 # the HTML 5 spec, section 8.1.2.2, doesn't allow spaces between
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58 # </ and the tag name, so maybe this should be fixed
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59 endtagfind = re.compile(r'</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')
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60
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61
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62
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63 class HTMLParser(_markupbase.ParserBase):
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64 """Find tags and other markup and call handler functions.
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65
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66 Usage:
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67 p = HTMLParser()
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68 p.feed(data)
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69 ...
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70 p.close()
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71
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72 Start tags are handled by calling self.handle_starttag() or
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73 self.handle_startendtag(); end tags by self.handle_endtag(). The
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74 data between tags is passed from the parser to the derived class
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75 by calling self.handle_data() with the data as argument (the data
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76 may be split up in arbitrary chunks). If convert_charrefs is
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77 True the character references are converted automatically to the
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78 corresponding Unicode character (and self.handle_data() is no
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79 longer split in chunks), otherwise they are passed by calling
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80 self.handle_entityref() or self.handle_charref() with the string
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81 containing respectively the named or numeric reference as the
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82 argument.
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83 """
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84
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85 CDATA_CONTENT_ELEMENTS = ("script", "style")
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86
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87 def __init__(self, *, convert_charrefs=True):
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jpayne@68
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88 """Initialize and reset this instance.
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89
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90 If convert_charrefs is True (the default), all character references
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91 are automatically converted to the corresponding Unicode characters.
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92 """
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93 self.convert_charrefs = convert_charrefs
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94 self.reset()
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95
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96 def reset(self):
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97 """Reset this instance. Loses all unprocessed data."""
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98 self.rawdata = ''
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99 self.lasttag = '???'
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100 self.interesting = interesting_normal
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101 self.cdata_elem = None
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102 _markupbase.ParserBase.reset(self)
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103
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104 def feed(self, data):
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105 r"""Feed data to the parser.
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106
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107 Call this as often as you want, with as little or as much text
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108 as you want (may include '\n').
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109 """
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110 self.rawdata = self.rawdata + data
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111 self.goahead(0)
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112
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113 def close(self):
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114 """Handle any buffered data."""
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115 self.goahead(1)
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116
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117 __starttag_text = None
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118
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119 def get_starttag_text(self):
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120 """Return full source of start tag: '<...>'."""
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121 return self.__starttag_text
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122
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123 def set_cdata_mode(self, elem):
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124 self.cdata_elem = elem.lower()
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125 self.interesting = re.compile(r'</\s*%s\s*>' % self.cdata_elem, re.I)
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126
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127 def clear_cdata_mode(self):
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128 self.interesting = interesting_normal
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129 self.cdata_elem = None
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130
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131 # Internal -- handle data as far as reasonable. May leave state
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132 # and data to be processed by a subsequent call. If 'end' is
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133 # true, force handling all data as if followed by EOF marker.
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134 def goahead(self, end):
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135 rawdata = self.rawdata
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136 i = 0
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137 n = len(rawdata)
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138 while i < n:
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139 if self.convert_charrefs and not self.cdata_elem:
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140 j = rawdata.find('<', i)
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141 if j < 0:
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jpayne@68
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142 # if we can't find the next <, either we are at the end
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143 # or there's more text incoming. If the latter is True,
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144 # we can't pass the text to handle_data in case we have
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145 # a charref cut in half at end. Try to determine if
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146 # this is the case before proceeding by looking for an
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147 # & near the end and see if it's followed by a space or ;.
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148 amppos = rawdata.rfind('&', max(i, n-34))
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149 if (amppos >= 0 and
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150 not re.compile(r'[\s;]').search(rawdata, amppos)):
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151 break # wait till we get all the text
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152 j = n
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153 else:
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154 match = self.interesting.search(rawdata, i) # < or &
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155 if match:
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156 j = match.start()
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157 else:
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158 if self.cdata_elem:
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159 break
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160 j = n
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161 if i < j:
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162 if self.convert_charrefs and not self.cdata_elem:
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163 self.handle_data(unescape(rawdata[i:j]))
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164 else:
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165 self.handle_data(rawdata[i:j])
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166 i = self.updatepos(i, j)
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167 if i == n: break
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168 startswith = rawdata.startswith
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169 if startswith('<', i):
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170 if starttagopen.match(rawdata, i): # < + letter
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171 k = self.parse_starttag(i)
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172 elif startswith("</", i):
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173 k = self.parse_endtag(i)
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174 elif startswith("<!--", i):
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175 k = self.parse_comment(i)
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176 elif startswith("<?", i):
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177 k = self.parse_pi(i)
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178 elif startswith("<!", i):
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179 k = self.parse_html_declaration(i)
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180 elif (i + 1) < n:
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181 self.handle_data("<")
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182 k = i + 1
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183 else:
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184 break
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185 if k < 0:
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jpayne@68
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186 if not end:
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187 break
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188 k = rawdata.find('>', i + 1)
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189 if k < 0:
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190 k = rawdata.find('<', i + 1)
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191 if k < 0:
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192 k = i + 1
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193 else:
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194 k += 1
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195 if self.convert_charrefs and not self.cdata_elem:
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196 self.handle_data(unescape(rawdata[i:k]))
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197 else:
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198 self.handle_data(rawdata[i:k])
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199 i = self.updatepos(i, k)
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200 elif startswith("&#", i):
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201 match = charref.match(rawdata, i)
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202 if match:
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203 name = match.group()[2:-1]
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204 self.handle_charref(name)
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205 k = match.end()
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206 if not startswith(';', k-1):
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207 k = k - 1
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208 i = self.updatepos(i, k)
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209 continue
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210 else:
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211 if ";" in rawdata[i:]: # bail by consuming &#
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212 self.handle_data(rawdata[i:i+2])
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213 i = self.updatepos(i, i+2)
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214 break
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215 elif startswith('&', i):
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216 match = entityref.match(rawdata, i)
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217 if match:
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218 name = match.group(1)
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219 self.handle_entityref(name)
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220 k = match.end()
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221 if not startswith(';', k-1):
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222 k = k - 1
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223 i = self.updatepos(i, k)
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224 continue
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225 match = incomplete.match(rawdata, i)
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226 if match:
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227 # match.group() will contain at least 2 chars
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228 if end and match.group() == rawdata[i:]:
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229 k = match.end()
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230 if k <= i:
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231 k = n
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232 i = self.updatepos(i, i + 1)
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233 # incomplete
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234 break
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235 elif (i + 1) < n:
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236 # not the end of the buffer, and can't be confused
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jpayne@68
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237 # with some other construct
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238 self.handle_data("&")
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239 i = self.updatepos(i, i + 1)
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240 else:
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241 break
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242 else:
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243 assert 0, "interesting.search() lied"
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244 # end while
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245 if end and i < n and not self.cdata_elem:
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246 if self.convert_charrefs and not self.cdata_elem:
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jpayne@68
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247 self.handle_data(unescape(rawdata[i:n]))
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248 else:
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249 self.handle_data(rawdata[i:n])
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250 i = self.updatepos(i, n)
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251 self.rawdata = rawdata[i:]
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252
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jpayne@68
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253 # Internal -- parse html declarations, return length or -1 if not terminated
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254 # See w3.org/TR/html5/tokenization.html#markup-declaration-open-state
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jpayne@68
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255 # See also parse_declaration in _markupbase
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jpayne@68
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256 def parse_html_declaration(self, i):
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257 rawdata = self.rawdata
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258 assert rawdata[i:i+2] == '<!', ('unexpected call to '
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259 'parse_html_declaration()')
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260 if rawdata[i:i+4] == '<!--':
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261 # this case is actually already handled in goahead()
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262 return self.parse_comment(i)
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jpayne@68
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263 elif rawdata[i:i+3] == '<![':
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264 return self.parse_marked_section(i)
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jpayne@68
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265 elif rawdata[i:i+9].lower() == '<!doctype':
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jpayne@68
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266 # find the closing >
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267 gtpos = rawdata.find('>', i+9)
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268 if gtpos == -1:
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269 return -1
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270 self.handle_decl(rawdata[i+2:gtpos])
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jpayne@68
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271 return gtpos+1
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272 else:
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273 return self.parse_bogus_comment(i)
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274
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jpayne@68
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275 # Internal -- parse bogus comment, return length or -1 if not terminated
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jpayne@68
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276 # see http://www.w3.org/TR/html5/tokenization.html#bogus-comment-state
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jpayne@68
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277 def parse_bogus_comment(self, i, report=1):
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278 rawdata = self.rawdata
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279 assert rawdata[i:i+2] in ('<!', '</'), ('unexpected call to '
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280 'parse_comment()')
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281 pos = rawdata.find('>', i+2)
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jpayne@68
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282 if pos == -1:
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jpayne@68
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283 return -1
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jpayne@68
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284 if report:
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285 self.handle_comment(rawdata[i+2:pos])
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jpayne@68
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286 return pos + 1
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jpayne@68
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287
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jpayne@68
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288 # Internal -- parse processing instr, return end or -1 if not terminated
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jpayne@68
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289 def parse_pi(self, i):
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jpayne@68
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290 rawdata = self.rawdata
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jpayne@68
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291 assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'
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jpayne@68
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292 match = piclose.search(rawdata, i+2) # >
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jpayne@68
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293 if not match:
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jpayne@68
|
294 return -1
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jpayne@68
|
295 j = match.start()
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jpayne@68
|
296 self.handle_pi(rawdata[i+2: j])
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jpayne@68
|
297 j = match.end()
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jpayne@68
|
298 return j
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jpayne@68
|
299
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jpayne@68
|
300 # Internal -- handle starttag, return end or -1 if not terminated
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jpayne@68
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301 def parse_starttag(self, i):
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jpayne@68
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302 self.__starttag_text = None
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jpayne@68
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303 endpos = self.check_for_whole_start_tag(i)
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jpayne@68
|
304 if endpos < 0:
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jpayne@68
|
305 return endpos
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jpayne@68
|
306 rawdata = self.rawdata
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jpayne@68
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307 self.__starttag_text = rawdata[i:endpos]
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jpayne@68
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308
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jpayne@68
|
309 # Now parse the data between i+1 and j into a tag and attrs
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jpayne@68
|
310 attrs = []
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jpayne@68
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311 match = tagfind_tolerant.match(rawdata, i+1)
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jpayne@68
|
312 assert match, 'unexpected call to parse_starttag()'
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jpayne@68
|
313 k = match.end()
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jpayne@68
|
314 self.lasttag = tag = match.group(1).lower()
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jpayne@68
|
315 while k < endpos:
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jpayne@68
|
316 m = attrfind_tolerant.match(rawdata, k)
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jpayne@68
|
317 if not m:
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jpayne@68
|
318 break
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jpayne@68
|
319 attrname, rest, attrvalue = m.group(1, 2, 3)
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jpayne@68
|
320 if not rest:
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jpayne@68
|
321 attrvalue = None
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jpayne@68
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322 elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
|
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jpayne@68
|
323 attrvalue[:1] == '"' == attrvalue[-1:]:
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jpayne@68
|
324 attrvalue = attrvalue[1:-1]
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jpayne@68
|
325 if attrvalue:
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jpayne@68
|
326 attrvalue = unescape(attrvalue)
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jpayne@68
|
327 attrs.append((attrname.lower(), attrvalue))
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jpayne@68
|
328 k = m.end()
|
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jpayne@68
|
329
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jpayne@68
|
330 end = rawdata[k:endpos].strip()
|
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jpayne@68
|
331 if end not in (">", "/>"):
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jpayne@68
|
332 lineno, offset = self.getpos()
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jpayne@68
|
333 if "\n" in self.__starttag_text:
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jpayne@68
|
334 lineno = lineno + self.__starttag_text.count("\n")
|
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jpayne@68
|
335 offset = len(self.__starttag_text) \
|
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jpayne@68
|
336 - self.__starttag_text.rfind("\n")
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jpayne@68
|
337 else:
|
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jpayne@68
|
338 offset = offset + len(self.__starttag_text)
|
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jpayne@68
|
339 self.handle_data(rawdata[i:endpos])
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jpayne@68
|
340 return endpos
|
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jpayne@68
|
341 if end.endswith('/>'):
|
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jpayne@68
|
342 # XHTML-style empty tag: <span attr="value" />
|
|
jpayne@68
|
343 self.handle_startendtag(tag, attrs)
|
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jpayne@68
|
344 else:
|
|
jpayne@68
|
345 self.handle_starttag(tag, attrs)
|
|
jpayne@68
|
346 if tag in self.CDATA_CONTENT_ELEMENTS:
|
|
jpayne@68
|
347 self.set_cdata_mode(tag)
|
|
jpayne@68
|
348 return endpos
|
|
jpayne@68
|
349
|
|
jpayne@68
|
350 # Internal -- check to see if we have a complete starttag; return end
|
|
jpayne@68
|
351 # or -1 if incomplete.
|
|
jpayne@68
|
352 def check_for_whole_start_tag(self, i):
|
|
jpayne@68
|
353 rawdata = self.rawdata
|
|
jpayne@68
|
354 m = locatestarttagend_tolerant.match(rawdata, i)
|
|
jpayne@68
|
355 if m:
|
|
jpayne@68
|
356 j = m.end()
|
|
jpayne@68
|
357 next = rawdata[j:j+1]
|
|
jpayne@68
|
358 if next == ">":
|
|
jpayne@68
|
359 return j + 1
|
|
jpayne@68
|
360 if next == "/":
|
|
jpayne@68
|
361 if rawdata.startswith("/>", j):
|
|
jpayne@68
|
362 return j + 2
|
|
jpayne@68
|
363 if rawdata.startswith("/", j):
|
|
jpayne@68
|
364 # buffer boundary
|
|
jpayne@68
|
365 return -1
|
|
jpayne@68
|
366 # else bogus input
|
|
jpayne@68
|
367 if j > i:
|
|
jpayne@68
|
368 return j
|
|
jpayne@68
|
369 else:
|
|
jpayne@68
|
370 return i + 1
|
|
jpayne@68
|
371 if next == "":
|
|
jpayne@68
|
372 # end of input
|
|
jpayne@68
|
373 return -1
|
|
jpayne@68
|
374 if next in ("abcdefghijklmnopqrstuvwxyz=/"
|
|
jpayne@68
|
375 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
|
|
jpayne@68
|
376 # end of input in or before attribute value, or we have the
|
|
jpayne@68
|
377 # '/' from a '/>' ending
|
|
jpayne@68
|
378 return -1
|
|
jpayne@68
|
379 if j > i:
|
|
jpayne@68
|
380 return j
|
|
jpayne@68
|
381 else:
|
|
jpayne@68
|
382 return i + 1
|
|
jpayne@68
|
383 raise AssertionError("we should not get here!")
|
|
jpayne@68
|
384
|
|
jpayne@68
|
385 # Internal -- parse endtag, return end or -1 if incomplete
|
|
jpayne@68
|
386 def parse_endtag(self, i):
|
|
jpayne@68
|
387 rawdata = self.rawdata
|
|
jpayne@68
|
388 assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
|
|
jpayne@68
|
389 match = endendtag.search(rawdata, i+1) # >
|
|
jpayne@68
|
390 if not match:
|
|
jpayne@68
|
391 return -1
|
|
jpayne@68
|
392 gtpos = match.end()
|
|
jpayne@68
|
393 match = endtagfind.match(rawdata, i) # </ + tag + >
|
|
jpayne@68
|
394 if not match:
|
|
jpayne@68
|
395 if self.cdata_elem is not None:
|
|
jpayne@68
|
396 self.handle_data(rawdata[i:gtpos])
|
|
jpayne@68
|
397 return gtpos
|
|
jpayne@68
|
398 # find the name: w3.org/TR/html5/tokenization.html#tag-name-state
|
|
jpayne@68
|
399 namematch = tagfind_tolerant.match(rawdata, i+2)
|
|
jpayne@68
|
400 if not namematch:
|
|
jpayne@68
|
401 # w3.org/TR/html5/tokenization.html#end-tag-open-state
|
|
jpayne@68
|
402 if rawdata[i:i+3] == '</>':
|
|
jpayne@68
|
403 return i+3
|
|
jpayne@68
|
404 else:
|
|
jpayne@68
|
405 return self.parse_bogus_comment(i)
|
|
jpayne@68
|
406 tagname = namematch.group(1).lower()
|
|
jpayne@68
|
407 # consume and ignore other stuff between the name and the >
|
|
jpayne@68
|
408 # Note: this is not 100% correct, since we might have things like
|
|
jpayne@68
|
409 # </tag attr=">">, but looking for > after tha name should cover
|
|
jpayne@68
|
410 # most of the cases and is much simpler
|
|
jpayne@68
|
411 gtpos = rawdata.find('>', namematch.end())
|
|
jpayne@68
|
412 self.handle_endtag(tagname)
|
|
jpayne@68
|
413 return gtpos+1
|
|
jpayne@68
|
414
|
|
jpayne@68
|
415 elem = match.group(1).lower() # script or style
|
|
jpayne@68
|
416 if self.cdata_elem is not None:
|
|
jpayne@68
|
417 if elem != self.cdata_elem:
|
|
jpayne@68
|
418 self.handle_data(rawdata[i:gtpos])
|
|
jpayne@68
|
419 return gtpos
|
|
jpayne@68
|
420
|
|
jpayne@68
|
421 self.handle_endtag(elem)
|
|
jpayne@68
|
422 self.clear_cdata_mode()
|
|
jpayne@68
|
423 return gtpos
|
|
jpayne@68
|
424
|
|
jpayne@68
|
425 # Overridable -- finish processing of start+end tag: <tag.../>
|
|
jpayne@68
|
426 def handle_startendtag(self, tag, attrs):
|
|
jpayne@68
|
427 self.handle_starttag(tag, attrs)
|
|
jpayne@68
|
428 self.handle_endtag(tag)
|
|
jpayne@68
|
429
|
|
jpayne@68
|
430 # Overridable -- handle start tag
|
|
jpayne@68
|
431 def handle_starttag(self, tag, attrs):
|
|
jpayne@68
|
432 pass
|
|
jpayne@68
|
433
|
|
jpayne@68
|
434 # Overridable -- handle end tag
|
|
jpayne@68
|
435 def handle_endtag(self, tag):
|
|
jpayne@68
|
436 pass
|
|
jpayne@68
|
437
|
|
jpayne@68
|
438 # Overridable -- handle character reference
|
|
jpayne@68
|
439 def handle_charref(self, name):
|
|
jpayne@68
|
440 pass
|
|
jpayne@68
|
441
|
|
jpayne@68
|
442 # Overridable -- handle entity reference
|
|
jpayne@68
|
443 def handle_entityref(self, name):
|
|
jpayne@68
|
444 pass
|
|
jpayne@68
|
445
|
|
jpayne@68
|
446 # Overridable -- handle data
|
|
jpayne@68
|
447 def handle_data(self, data):
|
|
jpayne@68
|
448 pass
|
|
jpayne@68
|
449
|
|
jpayne@68
|
450 # Overridable -- handle comment
|
|
jpayne@68
|
451 def handle_comment(self, data):
|
|
jpayne@68
|
452 pass
|
|
jpayne@68
|
453
|
|
jpayne@68
|
454 # Overridable -- handle declaration
|
|
jpayne@68
|
455 def handle_decl(self, decl):
|
|
jpayne@68
|
456 pass
|
|
jpayne@68
|
457
|
|
jpayne@68
|
458 # Overridable -- handle processing instruction
|
|
jpayne@68
|
459 def handle_pi(self, data):
|
|
jpayne@68
|
460 pass
|
|
jpayne@68
|
461
|
|
jpayne@68
|
462 def unknown_decl(self, data):
|
|
jpayne@68
|
463 pass
|
|
jpayne@68
|
464
|
|
jpayne@68
|
465 # Internal -- helper to remove special character quoting
|
|
jpayne@68
|
466 def unescape(self, s):
|
|
jpayne@68
|
467 warnings.warn('The unescape method is deprecated and will be removed '
|
|
jpayne@68
|
468 'in 3.5, use html.unescape() instead.',
|
|
jpayne@68
|
469 DeprecationWarning, stacklevel=2)
|
|
jpayne@68
|
470 return unescape(s)
|
