Mercurial > cpython-lru_cache-weakref

annotate Lib/HTMLParser.py @ 17934:e14b41fd2ab2 legacy-trunk

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Merge my changes to the offending comment with Guido's changes.
author Fred Drake <fdrake@acm.org>
date Wed, 23 May 2001 04:53:44 +0000
parents ce7f0e380830
children 00935031b373
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 """A parser for HTML."""
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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 string
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13
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14 # Regular expressions used for parsing
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15
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16 interesting_normal = re.compile('[&<]')
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17 interesting_cdata = re.compile(r'<(/|\Z)')
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18 incomplete = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*|#[0-9]*)?')
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19
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20 entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]')
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21 charref = re.compile('&#([0-9]+)[^0-9]')
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22
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23 starttagopen = re.compile('<[a-zA-Z]')
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24 piopen = re.compile(r'<\?')
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25 piclose = re.compile('>')
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26 endtagopen = re.compile('</')
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27 declopen = re.compile('<!')
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28 special = re.compile('<![^<>]*>')
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29 commentopen = re.compile('<!--')
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30 commentclose = re.compile(r'--\s*>')
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31 tagfind = re.compile('[a-zA-Z][-.a-zA-Z0-9:_]*')
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32 attrfind = re.compile(
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33 r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'
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34 r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./:;+*%?!&$\(\)_#=~]*))?')
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35
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36 locatestarttagend = re.compile(r"""
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37 <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
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38 (?:\s+ # whitespace before attribute name
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39 (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
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40 (?:\s*=\s* # value indicator
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41 (?:'[^']*' # LITA-enclosed value
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42 |\"[^\"]*\" # LIT-enclosed value
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43 |[^'\">\s]+ # bare value
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44 )
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45 )?
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46 )
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47 )*
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48 \s* # trailing whitespace
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49 """, re.VERBOSE)
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50 endstarttag = re.compile(r"\s*/?>")
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51 endendtag = re.compile('>')
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52 endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')
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53
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54 declname = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9]*\s*')
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55 declstringlit = re.compile(r'(\'[^\']*\'|"[^"]*")\s*')
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56
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57
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58 class HTMLParseError(Exception):
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59 """Exception raised for all parse errors."""
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60
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61 def __init__(self, msg, position=(None, None)):
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62 assert msg
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63 self.msg = msg
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64 self.lineno = position[0]
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65 self.offset = position[1]
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66
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67 def __str__(self):
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68 result = self.msg
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69 if self.lineno is not None:
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70 result = result + ", at line %d" % self.lineno
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71 if self.offset is not None:
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72 result = result + ", column %d" % (self.offset + 1)
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73 return result
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74
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75
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76 # HTML parser class -- find tags and call handler functions.
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77 # Usage:
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78 #
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79 # p = HTMLParser(); p.feed(data); ...; p.close()
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80
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81 # Start tags are handled by calling self.handle_starttag() or
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82 # self.handle_startendtag(); end tags by self.handle_endtag(). The
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83 # data between tags is passed from the parser to the derived class by
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84 # calling self.handle_data() with the data as argument (the data may
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85 # be split up in arbitrary chunks). Entity references are passed by
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86 # calling self.handle_entityref() with the entity reference as the
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87 # argument. Numeric character references are passed to
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88 # self.handle_charref() with the string containing the reference as
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89 # the argument.
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90
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91 class HTMLParser:
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92
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93 CDATA_CONTENT_ELEMENTS = ("script", "style")
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94
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95
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96 # Interface -- initialize and reset this instance
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97 def __init__(self):
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98 self.reset()
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99
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100 # Interface -- reset this instance. Loses all unprocessed data
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101 def reset(self):
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102 self.rawdata = ''
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103 self.stack = []
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104 self.lasttag = '???'
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105 self.lineno = 1
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106 self.offset = 0
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107 self.interesting = interesting_normal
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108
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109 # Interface -- feed some data to the parser. Call this as
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110 # often as you want, with as little or as much text as you
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111 # want (may include '\n'). (This just saves the text, all the
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112 # processing is done by goahead().)
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113 def feed(self, data):
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114 self.rawdata = self.rawdata + data
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115 self.goahead(0)
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116
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117 # Interface -- handle the remaining data
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118 def close(self):
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119 self.goahead(1)
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120
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121 # Internal -- update line number and offset. This should be
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122 # called for each piece of data exactly once, in order -- in other
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123 # words the concatenation of all the input strings to this
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124 # function should be exactly the entire input.
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125 def updatepos(self, i, j):
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126 if i >= j:
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127 return j
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128 rawdata = self.rawdata
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129 nlines = string.count(rawdata, "\n", i, j)
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130 if nlines:
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131 self.lineno = self.lineno + nlines
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132 pos = string.rindex(rawdata, "\n", i, j) # Should not fail
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133 self.offset = j-(pos+1)
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134 else:
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135 self.offset = self.offset + j-i
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136 return j
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137
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138 # Interface -- return current line number and offset.
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139 def getpos(self):
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140 return self.lineno, self.offset
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141
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142 __starttag_text = None
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143
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144 # Interface -- return full source of start tag: "<...>"
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145 def get_starttag_text(self):
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146 return self.__starttag_text
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147
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148 def set_cdata_mode(self):
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149 self.interesting = interesting_cdata
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150
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151 def clear_cdata_mode(self):
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152 self.interesting = interesting_normal
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153
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154 # Internal -- handle data as far as reasonable. May leave state
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155 # and data to be processed by a subsequent call. If 'end' is
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156 # true, force handling all data as if followed by EOF marker.
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157 def goahead(self, end):
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158 rawdata = self.rawdata
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159 i = 0
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160 n = len(rawdata)
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161 while i < n:
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162 match = self.interesting.search(rawdata, i) # < or &
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163 if match:
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164 j = match.start()
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165 else:
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166 j = n
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167 if i < j: self.handle_data(rawdata[i:j])
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168 i = self.updatepos(i, j)
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169 if i == n: break
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170 if rawdata[i] == '<':
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171 if starttagopen.match(rawdata, i): # < + letter
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172 k = self.parse_starttag(i)
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173 elif endtagopen.match(rawdata, i): # </
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174 k = self.parse_endtag(i)
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175 if k >= 0:
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176 self.clear_cdata_mode()
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177 elif commentopen.match(rawdata, i): # <!--
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178 k = self.parse_comment(i)
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179 elif piopen.match(rawdata, i): # <?
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180 k = self.parse_pi(i)
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181 elif declopen.match(rawdata, i): # <!
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182 k = self.parse_declaration(i)
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183 else:
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184 if i < n-1:
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185 raise HTMLParseError(
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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186 "invalid '<' construct: %s" % `rawdata[i:i+2]`,
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187 self.getpos())
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188 k = -1
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189 if k < 0:
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190 if end:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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191 raise HTMLParseError("EOF in middle of construct",
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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192 self.getpos())
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193 break
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194 i = self.updatepos(i, k)
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195 elif rawdata[i] == '&':
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196 match = charref.match(rawdata, i)
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197 if match:
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198 name = match.group(1)
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199 self.handle_charref(name)
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200 k = match.end()
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201 if rawdata[k-1] != ';':
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202 k = k-1
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203 i = self.updatepos(i, k)
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204 continue
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205 match = entityref.match(rawdata, i)
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206 if match:
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207 name = match.group(1)
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208 self.handle_entityref(name)
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209 k = match.end()
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210 if rawdata[k-1] != ';':
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211 k = k-1
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212 i = self.updatepos(i, k)
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213 continue
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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214 if incomplete.match(rawdata, i):
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215 if end:
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216 raise HTMLParseError(
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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217 "EOF in middle of entity or char ref",
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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218 self.getpos())
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219 return -1 # incomplete
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220 raise HTMLParseError("'&' not part of entity or char ref",
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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221 self.getpos())
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222 else:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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223 assert 0, "interesting.search() lied"
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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224 # end while
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225 if end and i < n:
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226 self.handle_data(rawdata[i:n])
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227 i = self.updatepos(i, n)
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228 self.rawdata = rawdata[i:]
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229
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230 # Internal -- parse comment, return end or -1 if not terminated
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231 def parse_comment(self, i):
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232 rawdata = self.rawdata
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233 assert rawdata[i:i+4] == '<!--', 'unexpected call to parse_comment()'
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234 match = commentclose.search(rawdata, i+4)
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diff changeset
235 if not match:
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236 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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237 j = match.start()
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238 self.handle_comment(rawdata[i+4: j])
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239 j = match.end()
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240 return j
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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241
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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242 # Internal -- parse declaration.
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243 def parse_declaration(self, i):
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244 # This is some sort of declaration; in "HTML as
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
245 # deployed," this should only be the document type
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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246 # declaration ("<!DOCTYPE html...>").
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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247 rawdata = self.rawdata
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248 j = i + 2
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249 assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
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250 if rawdata[j:j+1] in ("-", ""):
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251 # Start of comment followed by buffer boundary,
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diff changeset
252 # or just a buffer boundary.
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253 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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254 # in practice, this should look like: ((name|stringlit) S*)+ '>'
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255 n = len(rawdata)
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diff changeset
256 while j < n:
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257 c = rawdata[j]
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258 if c == ">":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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259 # end of declaration syntax
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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260 self.handle_decl(rawdata[i+2:j])
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261 return j + 1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
262 if c in "\"'":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
263 m = declstringlit.match(rawdata, j)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
264 if not m:
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265 return -1 # incomplete
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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266 j = m.end()
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
267 elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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268 m = declname.match(rawdata, j)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
269 if not m:
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270 return -1 # incomplete
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271 j = m.end()
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272 else:
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273 raise HTMLParseError(
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274 "unexpected char in declaration: %s" % `rawdata[j]`,
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275 self.getpos())
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276 return -1 # incomplete
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277
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278 # Internal -- parse processing instr, return end or -1 if not terminated
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279 def parse_pi(self, i):
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280 rawdata = self.rawdata
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281 assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'
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282 match = piclose.search(rawdata, i+2) # >
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283 if not match:
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284 return -1
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285 j = match.start()
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286 self.handle_pi(rawdata[i+2: j])
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287 j = match.end()
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288 return j
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289
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290 # Internal -- handle starttag, return end or -1 if not terminated
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291 def parse_starttag(self, i):
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292 self.__starttag_text = None
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293 endpos = self.check_for_whole_start_tag(i)
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294 if endpos < 0:
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295 return endpos
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296 rawdata = self.rawdata
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297 self.__starttag_text = rawdata[i:endpos]
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298
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299 # Now parse the data between i+1 and j into a tag and attrs
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300 attrs = []
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301 match = tagfind.match(rawdata, i+1)
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302 assert match, 'unexpected call to parse_starttag()'
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303 k = match.end()
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304 self.lasttag = tag = string.lower(rawdata[i+1:k])
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305
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306 while k < endpos:
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307 m = attrfind.match(rawdata, k)
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308 if not m:
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309 break
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310 attrname, rest, attrvalue = m.group(1, 2, 3)
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311 if not rest:
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312 attrvalue = None
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313 elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
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314 attrvalue[:1] == '"' == attrvalue[-1:]:
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315 attrvalue = attrvalue[1:-1]
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316 attrvalue = self.unescape(attrvalue)
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317 attrs.append((string.lower(attrname), attrvalue))
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318 k = m.end()
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319
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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320 end = string.strip(rawdata[k:endpos])
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321 if end not in (">", "/>"):
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322 lineno, offset = self.getpos()
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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323 if "\n" in self.__starttag_text:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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324 lineno = lineno + string.count(self.__starttag_text, "\n")
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325 offset = len(self.__starttag_text) \
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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326 - string.rfind(self.__starttag_text, "\n")
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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327 else:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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328 offset = offset + len(self.__starttag_text)
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329 raise HTMLParseError("junk characters in start tag: %s"
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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330 % `rawdata[k:endpos][:20]`,
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diff changeset
331 (lineno, offset))
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
332 if end[-2:] == '/>':
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333 # XHTML-style empty tag: <span attr="value" />
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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334 self.handle_startendtag(tag, attrs)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
335 else:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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336 self.handle_starttag(tag, attrs)
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diff changeset
337 if tag in self.CDATA_CONTENT_ELEMENTS:
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338 self.set_cdata_mode()
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339 return endpos
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340
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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341 # Internal -- check to see if we have a complete starttag; return end
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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342 # or -1 if incomplete.
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343 def check_for_whole_start_tag(self, i):
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344 rawdata = self.rawdata
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345 m = locatestarttagend.match(rawdata, i)
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diff changeset
346 if m:
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347 j = m.end()
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348 next = rawdata[j:j+1]
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diff changeset
349 if next == ">":
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350 return j + 1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
351 if next == "/":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
352 s = rawdata[j:j+2]
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
353 if s == "/>":
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diff changeset
354 return j + 2
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
355 if s == "/":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
356 # buffer boundary
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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357 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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358 # else bogus input
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
359 self.updatepos(i, j + 1)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
360 raise HTMLParseError("malformed empty start tag",
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
361 self.getpos())
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
362 if next == "":
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
363 # end of input
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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364 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
365 if next in ("abcdefghijklmnopqrstuvwxyz=/"
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
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366 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
367 # end of input in or before attribute value, or we have the
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diff changeset
368 # '/' from a '/>' ending
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
369 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
370 self.updatepos(i, j)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
371 raise HTMLParseError("malformed start tag", self.getpos())
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
372 raise AssertionError("we should not gt here!")
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
373
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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374 # Internal -- parse endtag, return end or -1 if incomplete
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
375 def parse_endtag(self, i):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
376 rawdata = self.rawdata
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
377 assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
378 match = endendtag.search(rawdata, i+1) # >
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diff changeset
379 if not match:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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380 return -1
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
381 j = match.end()
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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382 match = endtagfind.match(rawdata, i) # </ + tag + >
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diff changeset
383 if not match:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
384 raise HTMLParseError("bad end tag: %s" % `rawdata[i:j]`,
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
385 self.getpos())
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
386 tag = match.group(1)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
387 self.handle_endtag(string.lower(tag))
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
388 return j
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
389
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
390 # Overridable -- finish processing of start+end tag: <tag.../>
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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diff changeset
391 def handle_startendtag(self, tag, attrs):
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diff changeset
392 self.handle_starttag(tag, attrs)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
393 self.handle_endtag(tag)
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
394
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
395 # Overridable -- handle start tag
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
396 def handle_starttag(self, tag, attrs):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
397 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
398
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
399 # Overridable -- handle end tag
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
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parents:
diff changeset
400 def handle_endtag(self, tag):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
401 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
402
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
403 # Overridable -- handle character reference
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
404 def handle_charref(self, name):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
405 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
406
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
407 # Overridable -- handle entity reference
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
408 def handle_entityref(self, name):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
409 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
410
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
411 # Overridable -- handle data
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
412 def handle_data(self, data):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
413 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
414
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
415 # Overridable -- handle comment
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
416 def handle_comment(self, data):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
417 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
418
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
419 # Overridable -- handle declaration
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
420 def handle_decl(self, decl):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
421 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
422
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
423 # Overridable -- handle processing instruction
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
424 def handle_pi(self, data):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
425 pass
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
426
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
427 # Internal -- helper to remove special character quoting
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
428 def unescape(self, s):
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
429 if '&' not in s:
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
430 return s
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
431 s = string.replace(s, "&lt;", "<")
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
432 s = string.replace(s, "&gt;", ">")
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
433 s = string.replace(s, "&apos;", "'")
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
434 s = string.replace(s, "&quot;", '"')
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
435 s = string.replace(s, "&amp;", "&") # Must be last
055fc046e080 A much improved HTML parser -- a replacement for sgmllib. The API is
Guido van Rossum <guido@python.org>
parents:
diff changeset
436 return s