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annotate TAL/HTMLParser.py @ 1029:c3e391d9c4e9

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author Richard Jones <richard@users.sourceforge.net>
date Tue, 03 Sep 2002 07:42:38 +0000
parents bfd348432420
children
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1 """A parser for HTML and XHTML."""
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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 markupbase
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12 import re
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13 import string
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14
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15 # Regular expressions used for parsing
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16
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17 interesting_normal = re.compile('[&<]')
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18 interesting_cdata = re.compile(r'<(/|\Z)')
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19 incomplete = re.compile('&[a-zA-Z#]')
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20
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21 entityref = re.compile('&([a-zA-Z][-.a-zA-Z0-9]*)[^a-zA-Z0-9]')
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22 charref = re.compile('&#(?:[0-9]+|[xX][0-9a-fA-F]+)[^0-9a-fA-F]')
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23
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24 starttagopen = re.compile('<[a-zA-Z]')
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25 piclose = re.compile('>')
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26 endtagopen = re.compile('</')
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27 commentclose = re.compile(r'--\s*>')
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28 tagfind = re.compile('[a-zA-Z][-.a-zA-Z0-9:_]*')
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29 attrfind = re.compile(
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30 r'\s*([a-zA-Z_][-.:a-zA-Z_0-9]*)(\s*=\s*'
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31 r'(\'[^\']*\'|"[^"]*"|[-a-zA-Z0-9./:;+*%?!&$\(\)_#=~]*))?')
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32
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33 locatestarttagend = re.compile(r"""
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34 <[a-zA-Z][-.a-zA-Z0-9:_]* # tag name
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35 (?:\s+ # whitespace before attribute name
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36 (?:[a-zA-Z_][-.:a-zA-Z0-9_]* # attribute name
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37 (?:\s*=\s* # value indicator
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38 (?:'[^']*' # LITA-enclosed value
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39 |\"[^\"]*\" # LIT-enclosed value
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40 |[^'\">\s]+ # bare value
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41 )
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42 )?
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43 )
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44 )*
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45 \s* # trailing whitespace
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46 """, re.VERBOSE)
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47 endendtag = re.compile('>')
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48 endtagfind = re.compile('</\s*([a-zA-Z][-.a-zA-Z0-9:_]*)\s*>')
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49
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50
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51 class HTMLParseError(Exception):
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52 """Exception raised for all parse errors."""
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53
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54 def __init__(self, msg, position=(None, None)):
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55 assert msg
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56 self.msg = msg
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57 self.lineno = position[0]
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58 self.offset = position[1]
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59
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60 def __str__(self):
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61 result = self.msg
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62 if self.lineno is not None:
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63 result = result + ", at line %d" % self.lineno
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64 if self.offset is not None:
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65 result = result + ", column %d" % (self.offset + 1)
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66 return result
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67
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68
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69 def _contains_at(s, sub, pos):
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70 return s[pos:pos+len(sub)] == sub
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71
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72
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73 class HTMLParser(markupbase.ParserBase):
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74 """Find tags and other markup and call handler functions.
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75
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76 Usage:
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77 p = HTMLParser()
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78 p.feed(data)
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79 ...
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80 p.close()
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81
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82 Start tags are handled by calling self.handle_starttag() or
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83 self.handle_startendtag(); end tags by self.handle_endtag(). The
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84 data between tags is passed from the parser to the derived class
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85 by calling self.handle_data() with the data as argument (the data
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86 may be split up in arbitrary chunks). Entity references are
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87 passed by calling self.handle_entityref() with the entity
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88 reference as the argument. Numeric character references are
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89 passed to self.handle_charref() with the string containing the
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90 reference as the argument.
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91 """
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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 def __init__(self):
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97 """Initialize and reset this instance."""
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98 self.reset()
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99
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100 def reset(self):
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101 """Reset this instance. Loses all unprocessed data."""
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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.interesting = interesting_normal
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106 markupbase.ParserBase.reset(self)
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107
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108 def feed(self, data):
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109 """Feed data to the parser.
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110
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111 Call this as often as you want, with as little or as much text
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112 as you want (may include '\n').
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113 """
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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 def close(self):
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118 """Handle any buffered data."""
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119 self.goahead(1)
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120
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121 def error(self, message):
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122 raise HTMLParseError(message, self.getpos())
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123
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124 __starttag_text = None
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125
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126 def get_starttag_text(self):
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127 """Return full source of start tag: '<...>'."""
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128 return self.__starttag_text
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129
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130 cdata_endtag = None
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131
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132 def set_cdata_mode(self, endtag=None):
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133 self.cdata_endtag = endtag
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134 self.interesting = interesting_cdata
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135
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136 def clear_cdata_mode(self):
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137 self.cdata_endtag = None
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138 self.interesting = interesting_normal
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139
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140 # Internal -- handle data as far as reasonable. May leave state
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141 # and data to be processed by a subsequent call. If 'end' is
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142 # true, force handling all data as if followed by EOF marker.
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143 def goahead(self, end):
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144 rawdata = self.rawdata
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145 i = 0
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146 n = len(rawdata)
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147 while i < n:
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148 match = self.interesting.search(rawdata, i) # < or &
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149 if match:
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150 j = match.start()
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151 else:
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152 j = n
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153 if i < j: self.handle_data(rawdata[i:j])
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154 i = self.updatepos(i, j)
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155 if i == n: break
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156 if rawdata[i] == '<':
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157 if starttagopen.match(rawdata, i): # < + letter
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158 k = self.parse_starttag(i)
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159 elif endtagopen.match(rawdata, i): # </
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160 k = self.parse_endtag(i)
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161 elif _contains_at(rawdata, "<!--", i): # <!--
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162 k = self.parse_comment(i)
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163 elif _contains_at(rawdata, "<!", i): # <!
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
164 k = self.parse_declaration(i)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
165 elif _contains_at(rawdata, "<?", i): # <?
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
166 k = self.parse_pi(i)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
167 elif _contains_at(rawdata, "<?", i): # <!
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
168 k = self.parse_declaration(i)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
169 elif (i + 1) < n:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
170 self.handle_data("<")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
171 k = i + 1
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
172 else:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
173 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
174 if k < 0:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
175 if end:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
176 self.error("EOF in middle of construct")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
177 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
178 i = self.updatepos(i, k)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
179 elif rawdata[i:i+2] == "&#":
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
180 match = charref.match(rawdata, i)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
181 if match:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
182 name = match.group()[2:-1]
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
183 self.handle_charref(name)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
184 k = match.end()
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
185 if rawdata[k-1] != ';':
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
186 k = k - 1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
187 i = self.updatepos(i, k)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
188 continue
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
189 else:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
190 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
191 elif rawdata[i] == '&':
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
192 match = entityref.match(rawdata, i)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
193 if match:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
194 name = match.group(1)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
195 self.handle_entityref(name)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
196 k = match.end()
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
197 if rawdata[k-1] != ';':
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
198 k = k - 1
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
199 i = self.updatepos(i, k)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
200 continue
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
201 match = incomplete.match(rawdata, i)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
202 if match:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
203 # match.group() will contain at least 2 chars
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
204 rest = rawdata[i:]
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
205 if end and match.group() == rest:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
206 self.error("EOF in middle of entity or char ref")
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
207 # incomplete
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
208 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
209 elif (i + 1) < n:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
210 # not the end of the buffer, and can't be confused
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
211 # with some other construct
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
212 self.handle_data("&")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
213 i = self.updatepos(i, i + 1)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
214 else:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
215 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
216 else:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
217 assert 0, "interesting.search() lied"
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
218 # end while
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
219 if end and i < n:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
220 self.handle_data(rawdata[i:n])
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
221 i = self.updatepos(i, n)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
222 self.rawdata = rawdata[i:]
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
223
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
224 # Internal -- parse comment, return end or -1 if not terminated
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
225 def parse_comment(self, i, report=1):
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
226 rawdata = self.rawdata
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
227 assert rawdata[i:i+4] == '<!--', 'unexpected call to parse_comment()'
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
228 match = commentclose.search(rawdata, i+4)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
229 if not match:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
230 return -1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
231 if report:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
232 j = match.start()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
233 self.handle_comment(rawdata[i+4: j])
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
234 j = match.end()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
235 return j
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
236
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
237 # Internal -- parse processing instr, return end or -1 if not terminated
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
238 def parse_pi(self, i):
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
239 rawdata = self.rawdata
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
240 assert rawdata[i:i+2] == '<?', 'unexpected call to parse_pi()'
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
241 match = piclose.search(rawdata, i+2) # >
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
242 if not match:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
243 return -1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
244 j = match.start()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
245 self.handle_pi(rawdata[i+2: j])
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
246 j = match.end()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
247 return j
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
248
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
249 # Internal -- handle starttag, return end or -1 if not terminated
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
250 def parse_starttag(self, i):
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
251 self.__starttag_text = None
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
252 endpos = self.check_for_whole_start_tag(i)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
253 if endpos < 0:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
254 return endpos
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
255 rawdata = self.rawdata
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
256 self.__starttag_text = rawdata[i:endpos]
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
257
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
258 # Now parse the data between i+1 and j into a tag and attrs
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
259 attrs = []
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
260 match = tagfind.match(rawdata, i+1)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
261 assert match, 'unexpected call to parse_starttag()'
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
262 k = match.end()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
263 self.lasttag = tag = string.lower(rawdata[i+1:k])
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
264
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
265 while k < endpos:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
266 m = attrfind.match(rawdata, k)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
267 if not m:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
268 break
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
269 attrname, rest, attrvalue = m.group(1, 2, 3)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
270 if not rest:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
271 attrvalue = None
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
272 elif attrvalue[:1] == '\'' == attrvalue[-1:] or \
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
273 attrvalue[:1] == '"' == attrvalue[-1:]:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
274 attrvalue = attrvalue[1:-1]
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
275 attrvalue = self.unescape(attrvalue)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
276 attrs.append((string.lower(attrname), attrvalue))
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
277 k = m.end()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
278
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
279 end = string.strip(rawdata[k:endpos])
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
280 if end not in (">", "/>"):
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
281 lineno, offset = self.getpos()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
282 if "\n" in self.__starttag_text:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
283 lineno = lineno + string.count(self.__starttag_text, "\n")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
284 offset = len(self.__starttag_text) \
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
285 - string.rfind(self.__starttag_text, "\n")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
286 else:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
287 offset = offset + len(self.__starttag_text)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
288 self.error("junk characters in start tag: %s"
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
289 % `rawdata[k:endpos][:20]`)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
290 if end[-2:] == '/>':
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
291 # XHTML-style empty tag: <span attr="value" />
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
292 self.handle_startendtag(tag, attrs)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
293 else:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
294 self.handle_starttag(tag, attrs)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
295 if tag in self.CDATA_CONTENT_ELEMENTS:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
296 self.set_cdata_mode(tag)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
297 return endpos
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
298
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
299 # Internal -- check to see if we have a complete starttag; return end
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
300 # or -1 if incomplete.
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
301 def check_for_whole_start_tag(self, i):
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
302 rawdata = self.rawdata
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
303 m = locatestarttagend.match(rawdata, i)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
304 if m:
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
305 j = m.end()
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
306 next = rawdata[j:j+1]
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
307 if next == ">":
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
308 return j + 1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
309 if next == "/":
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
310 s = rawdata[j:j+2]
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
311 if s == "/>":
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
312 return j + 2
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
313 if s == "/":
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
314 # buffer boundary
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
315 return -1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
316 # else bogus input
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
317 self.updatepos(i, j + 1)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
318 self.error("malformed empty start tag")
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
319 if next == "":
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
320 # end of input
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
321 return -1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
322 if next in ("abcdefghijklmnopqrstuvwxyz=/"
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
323 "ABCDEFGHIJKLMNOPQRSTUVWXYZ"):
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
324 # end of input in or before attribute value, or we have the
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
325 # '/' from a '/>' ending
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
326 return -1
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
327 self.updatepos(i, j)
bfd348432420 Adding TAL to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
328 self.error("malformed start tag")
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329 raise AssertionError("we should not get here!")
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330
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331 # Internal -- parse endtag, return end or -1 if incomplete
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332 def parse_endtag(self, i):
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333 rawdata = self.rawdata
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334 assert rawdata[i:i+2] == "</", "unexpected call to parse_endtag"
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335 match = endendtag.search(rawdata, i+1) # >
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336 if not match:
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337 return -1
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338 j = match.end()
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339 match = endtagfind.match(rawdata, i) # </ + tag + >
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340 if not match:
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341 self.error("bad end tag: %s" % `rawdata[i:j]`)
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342 tag = string.lower(match.group(1))
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343 if ( self.cdata_endtag is not None
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344 and tag != self.cdata_endtag):
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345 # Should be a mismatched end tag, but we'll treat it
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346 # as text anyway, since most HTML authors aren't
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347 # interested in the finer points of syntax.
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348 self.handle_data(match.group(0))
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349 else:
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350 self.handle_endtag(tag)
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351 self.clear_cdata_mode()
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352 return j
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353
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354 # Overridable -- finish processing of start+end tag: <tag.../>
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355 def handle_startendtag(self, tag, attrs):
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356 self.handle_starttag(tag, attrs)
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357 self.handle_endtag(tag)
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358
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359 # Overridable -- handle start tag
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360 def handle_starttag(self, tag, attrs):
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361 pass
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362
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363 # Overridable -- handle end tag
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364 def handle_endtag(self, tag):
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365 pass
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366
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367 # Overridable -- handle character reference
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368 def handle_charref(self, name):
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369 pass
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370
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371 # Overridable -- handle entity reference
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372 def handle_entityref(self, name):
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373 pass
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374
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375 # Overridable -- handle data
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376 def handle_data(self, data):
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377 pass
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378
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379 # Overridable -- handle comment
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380 def handle_comment(self, data):
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381 pass
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382
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383 # Overridable -- handle declaration
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384 def handle_decl(self, decl):
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385 pass
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386
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387 # Overridable -- handle processing instruction
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388 def handle_pi(self, data):
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389 pass
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390
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391 def unknown_decl(self, data):
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392 self.error("unknown declaration: " + `data`)
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393
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394 # Internal -- helper to remove special character quoting
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395 def unescape(self, s):
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396 if '&' not in s:
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397 return s
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398 s = string.replace(s, "&lt;", "<")
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399 s = string.replace(s, "&gt;", ">")
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400 s = string.replace(s, "&apos;", "'")
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401 s = string.replace(s, "&quot;", '"')
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402 s = string.replace(s, "&amp;", "&") # Must be last
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403 return s
Roundup Issue Tracker: http://roundup-tracker.org/