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1 """Shared support for scanning document type declarations in HTML and XHTML."""
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2
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3 import re
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4 import string
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5
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6 _declname_match = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9]*\s*').match
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7 _declstringlit_match = re.compile(r'(\'[^\']*\'|"[^"]*")\s*').match
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8
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9 del re
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10
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11
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12 class ParserBase:
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13 """Parser base class which provides some common support methods used
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14 by the SGML/HTML and XHTML parsers."""
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15
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16 def reset(self):
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17 self.lineno = 1
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18 self.offset = 0
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19
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20 def getpos(self):
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21 """Return current line number and offset."""
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22 return self.lineno, self.offset
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23
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24 # Internal -- update line number and offset. This should be
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25 # called for each piece of data exactly once, in order -- in other
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26 # words the concatenation of all the input strings to this
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27 # function should be exactly the entire input.
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28 def updatepos(self, i, j):
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29 if i >= j:
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30 return j
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31 rawdata = self.rawdata
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32 nlines = string.count(rawdata, "\n", i, j)
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33 if nlines:
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34 self.lineno = self.lineno + nlines
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35 pos = string.rindex(rawdata, "\n", i, j) # Should not fail
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36 self.offset = j-(pos+1)
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37 else:
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38 self.offset = self.offset + j-i
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39 return j
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40
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41 _decl_otherchars = ''
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42
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43 # Internal -- parse declaration (for use by subclasses).
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44 def parse_declaration(self, i):
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45 # This is some sort of declaration; in "HTML as
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46 # deployed," this should only be the document type
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47 # declaration ("<!DOCTYPE html...>").
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48 rawdata = self.rawdata
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49 import sys
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50 j = i + 2
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51 assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
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52 if rawdata[j:j+1] in ("-", ""):
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53 # Start of comment followed by buffer boundary,
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54 # or just a buffer boundary.
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55 return -1
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56 # in practice, this should look like: ((name|stringlit) S*)+ '>'
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57 n = len(rawdata)
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58 decltype, j = self._scan_name(j, i)
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59 if j < 0:
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60 return j
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61 if decltype == "doctype":
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62 self._decl_otherchars = ''
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63 while j < n:
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64 c = rawdata[j]
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65 if c == ">":
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66 # end of declaration syntax
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67 data = rawdata[i+2:j]
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68 if decltype == "doctype":
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69 self.handle_decl(data)
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70 else:
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71 self.unknown_decl(data)
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72 return j + 1
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73 if c in "\"'":
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74 m = _declstringlit_match(rawdata, j)
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75 if not m:
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76 return -1 # incomplete
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77 j = m.end()
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78 elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
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79 name, j = self._scan_name(j, i)
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80 elif c in self._decl_otherchars:
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81 j = j + 1
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82 elif c == "[":
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83 if decltype == "doctype":
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84 j = self._parse_doctype_subset(j + 1, i)
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85 else:
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86 self.error("unexpected '[' char in declaration")
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87 else:
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88 self.error(
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89 "unexpected %s char in declaration" % `rawdata[j]`)
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90 if j < 0:
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91 return j
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92 return -1 # incomplete
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93
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94 # Internal -- scan past the internal subset in a <!DOCTYPE declaration,
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95 # returning the index just past any whitespace following the trailing ']'.
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96 def _parse_doctype_subset(self, i, declstartpos):
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97 rawdata = self.rawdata
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98 n = len(rawdata)
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99 j = i
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100 while j < n:
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101 c = rawdata[j]
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102 if c == "<":
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103 s = rawdata[j:j+2]
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104 if s == "<":
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105 # end of buffer; incomplete
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106 return -1
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107 if s != "<!":
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108 self.updatepos(declstartpos, j + 1)
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109 self.error("unexpected char in internal subset (in %s)"
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110 % `s`)
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111 if (j + 2) == n:
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112 # end of buffer; incomplete
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113 return -1
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114 if (j + 4) > n:
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115 # end of buffer; incomplete
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116 return -1
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117 if rawdata[j:j+4] == "<!--":
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118 j = self.parse_comment(j, report=0)
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119 if j < 0:
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120 return j
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121 continue
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122 name, j = self._scan_name(j + 2, declstartpos)
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123 if j == -1:
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124 return -1
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125 if name not in ("attlist", "element", "entity", "notation"):
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126 self.updatepos(declstartpos, j + 2)
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127 self.error(
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128 "unknown declaration %s in internal subset" % `name`)
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129 # handle the individual names
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130 meth = getattr(self, "_parse_doctype_" + name)
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131 j = meth(j, declstartpos)
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132 if j < 0:
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133 return j
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134 elif c == "%":
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135 # parameter entity reference
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136 if (j + 1) == n:
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137 # end of buffer; incomplete
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138 return -1
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139 s, j = self._scan_name(j + 1, declstartpos)
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140 if j < 0:
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141 return j
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142 if rawdata[j] == ";":
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143 j = j + 1
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144 elif c == "]":
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145 j = j + 1
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146 while j < n and rawdata[j] in string.whitespace:
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147 j = j + 1
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148 if j < n:
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149 if rawdata[j] == ">":
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150 return j
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151 self.updatepos(declstartpos, j)
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152 self.error("unexpected char after internal subset")
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153 else:
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154 return -1
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155 elif c in string.whitespace:
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156 j = j + 1
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157 else:
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158 self.updatepos(declstartpos, j)
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159 self.error("unexpected char %s in internal subset" % `c`)
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160 # end of buffer reached
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161 return -1
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162
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163 # Internal -- scan past <!ELEMENT declarations
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164 def _parse_doctype_element(self, i, declstartpos):
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165 rawdata = self.rawdata
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166 n = len(rawdata)
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167 name, j = self._scan_name(i, declstartpos)
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168 if j == -1:
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169 return -1
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170 # style content model; just skip until '>'
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171 if '>' in rawdata[j:]:
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172 return string.find(rawdata, ">", j) + 1
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173 return -1
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174
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175 # Internal -- scan past <!ATTLIST declarations
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176 def _parse_doctype_attlist(self, i, declstartpos):
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177 rawdata = self.rawdata
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178 name, j = self._scan_name(i, declstartpos)
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179 c = rawdata[j:j+1]
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180 if c == "":
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181 return -1
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182 if c == ">":
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183 return j + 1
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184 while 1:
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185 # scan a series of attribute descriptions; simplified:
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186 # name type [value] [#constraint]
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187 name, j = self._scan_name(j, declstartpos)
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188 if j < 0:
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189 return j
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190 c = rawdata[j:j+1]
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191 if c == "":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
192 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
193 if c == "(":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
194 # an enumerated type; look for ')'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
195 if ")" in rawdata[j:]:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
196 j = string.find(rawdata, ")", j) + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
197 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
198 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
199 while rawdata[j:j+1] in string.whitespace:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
200 j = j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
201 if not rawdata[j:]:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
202 # end of buffer, incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
203 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
204 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
205 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
206 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
207 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
208 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
209 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
210 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
211 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
212 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
213 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
214 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
215 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
216 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
217 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
218 if c == "#":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
219 if rawdata[j:] == "#":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
220 # end of buffer
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
221 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
222 name, j = self._scan_name(j + 1, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
223 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
224 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
225 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
226 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
227 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
228 if c == '>':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
229 # all done
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
230 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
231
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
232 # Internal -- scan past <!NOTATION declarations
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
233 def _parse_doctype_notation(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
234 name, j = self._scan_name(i, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
235 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
236 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
237 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
238 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
239 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
240 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
241 # end of buffer; incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
242 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
243 if c == '>':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
244 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
245 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
246 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
247 if not m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
248 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
249 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
250 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
251 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
252 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
253 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
254
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
255 # Internal -- scan past <!ENTITY declarations
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
256 def _parse_doctype_entity(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
257 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
258 if rawdata[i:i+1] == "%":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
259 j = i + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
260 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
261 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
262 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
263 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
264 if c in string.whitespace:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
265 j = j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
266 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
267 break
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
268 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
269 j = i
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
270 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
271 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
272 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
273 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
274 c = self.rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
275 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
276 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
277 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
278 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
279 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
280 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
281 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
282 return -1 # incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
283 elif c == ">":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
284 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
285 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
286 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
287 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
288 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
289
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
290 # Internal -- scan a name token and the new position and the token, or
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
291 # return -1 if we've reached the end of the buffer.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
292 def _scan_name(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
293 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
294 n = len(rawdata)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
295 if i == n:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
296 return None, -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
297 m = _declname_match(rawdata, i)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
298 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
299 s = m.group()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
300 name = string.strip(s)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
301 if (i + len(s)) == n:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
302 return None, -1 # end of buffer
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
303 return string.lower(name), m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
304 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
305 self.updatepos(declstartpos, i)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
306 self.error("expected name token", self.getpos())
|
