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2348
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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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2348
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3 import re, string
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4
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5 _declname_match = re.compile(r'[a-zA-Z][-_.a-zA-Z0-9]*\s*').match
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6 _declstringlit_match = re.compile(r'(\'[^\']*\'|"[^"]*")\s*').match
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7
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8 del re
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9
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10
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11 class ParserBase:
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12 """Parser base class which provides some common support methods used
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13 by the SGML/HTML and XHTML parsers."""
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14
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15 def reset(self):
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16 self.lineno = 1
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17 self.offset = 0
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18
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19 def getpos(self):
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20 """Return current line number and offset."""
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21 return self.lineno, self.offset
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22
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23 def error(self, message):
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24 """Return an error, showing current line number and offset.
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25
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26 Concrete subclasses *must* override this method.
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27 """
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28 raise NotImplementedError
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29
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30 # Internal -- update line number and offset. This should be
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31 # called for each piece of data exactly once, in order -- in other
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32 # words the concatenation of all the input strings to this
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33 # function should be exactly the entire input.
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34 def updatepos(self, i, j):
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35 if i >= j:
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36 return j
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37 rawdata = self.rawdata
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38 nlines = rawdata.count("\n", i, j)
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39 if nlines:
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40 self.lineno = self.lineno + nlines
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41 pos = rawdata.rindex("\n", i, j) # Should not fail
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42 self.offset = j-(pos+1)
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43 else:
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44 self.offset = self.offset + j-i
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45 return j
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46
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47 _decl_otherchars = ''
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48
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49 # Internal -- parse declaration (for use by subclasses).
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50 def parse_declaration(self, i):
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51 # This is some sort of declaration; in "HTML as
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52 # deployed," this should only be the document type
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53 # declaration ("<!DOCTYPE html...>").
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54 rawdata = self.rawdata
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55 import sys
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56 j = i + 2
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57 assert rawdata[i:j] == "<!", "unexpected call to parse_declaration"
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58 if rawdata[j:j+1] in ("-", ""):
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59 # Start of comment followed by buffer boundary,
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60 # or just a buffer boundary.
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61 return -1
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62 # in practice, this should look like: ((name|stringlit) S*)+ '>'
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63 n = len(rawdata)
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64 decltype, j = self._scan_name(j, i)
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65 if j < 0:
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66 return j
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67 if decltype == "doctype":
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68 self._decl_otherchars = ''
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69 while j < n:
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70 c = rawdata[j]
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71 if c == ">":
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72 # end of declaration syntax
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73 data = rawdata[i+2:j]
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74 if decltype == "doctype":
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75 self.handle_decl(data)
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76 else:
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77 self.unknown_decl(data)
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78 return j + 1
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79 if c in "\"'":
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80 m = _declstringlit_match(rawdata, j)
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81 if not m:
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82 return -1 # incomplete
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83 j = m.end()
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84 elif c in "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ":
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85 name, j = self._scan_name(j, i)
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86 elif c in self._decl_otherchars:
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87 j = j + 1
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88 elif c == "[":
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89 if decltype == "doctype":
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90 j = self._parse_doctype_subset(j + 1, i)
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91 else:
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92 self.error("unexpected '[' char in declaration")
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93 else:
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94 self.error(
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95 "unexpected %s char in declaration" % `rawdata[j]`)
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96 if j < 0:
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97 return j
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98 return -1 # incomplete
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99
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100 # Internal -- scan past the internal subset in a <!DOCTYPE declaration,
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101 # returning the index just past any whitespace following the trailing ']'.
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102 def _parse_doctype_subset(self, i, declstartpos):
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103 rawdata = self.rawdata
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104 n = len(rawdata)
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105 j = i
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106 while j < n:
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107 c = rawdata[j]
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108 if c == "<":
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109 s = rawdata[j:j+2]
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110 if s == "<":
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111 # end of buffer; incomplete
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112 return -1
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113 if s != "<!":
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114 self.updatepos(declstartpos, j + 1)
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115 self.error("unexpected char in internal subset (in %s)"
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116 % `s`)
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117 if (j + 2) == n:
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118 # end of buffer; incomplete
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119 return -1
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120 if (j + 4) > n:
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121 # end of buffer; incomplete
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122 return -1
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123 if rawdata[j:j+4] == "<!--":
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124 j = self.parse_comment(j, report=0)
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125 if j < 0:
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126 return j
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127 continue
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128 name, j = self._scan_name(j + 2, declstartpos)
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129 if j == -1:
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130 return -1
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131 if name not in ("attlist", "element", "entity", "notation"):
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132 self.updatepos(declstartpos, j + 2)
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133 self.error(
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134 "unknown declaration %s in internal subset" % `name`)
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135 # handle the individual names
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136 meth = getattr(self, "_parse_doctype_" + name)
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137 j = meth(j, declstartpos)
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138 if j < 0:
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139 return j
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140 elif c == "%":
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141 # parameter entity reference
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142 if (j + 1) == n:
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143 # end of buffer; incomplete
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144 return -1
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145 s, j = self._scan_name(j + 1, declstartpos)
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146 if j < 0:
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147 return j
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148 if rawdata[j] == ";":
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149 j = j + 1
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150 elif c == "]":
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151 j = j + 1
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152 while j < n and rawdata[j] in string.whitespace:
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153 j = j + 1
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154 if j < n:
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155 if rawdata[j] == ">":
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156 return j
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157 self.updatepos(declstartpos, j)
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158 self.error("unexpected char after internal subset")
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159 else:
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160 return -1
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161 elif c in string.whitespace:
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162 j = j + 1
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163 else:
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164 self.updatepos(declstartpos, j)
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165 self.error("unexpected char %s in internal subset" % `c`)
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166 # end of buffer reached
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167 return -1
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168
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169 # Internal -- scan past <!ELEMENT declarations
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170 def _parse_doctype_element(self, i, declstartpos):
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171 rawdata = self.rawdata
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172 n = len(rawdata)
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173 name, j = self._scan_name(i, declstartpos)
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174 if j == -1:
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175 return -1
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176 # style content model; just skip until '>'
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177 if '>' in rawdata[j:]:
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178 return rawdata.find(">", j) + 1
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179 return -1
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180
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181 # Internal -- scan past <!ATTLIST declarations
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182 def _parse_doctype_attlist(self, i, declstartpos):
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183 rawdata = self.rawdata
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184 name, j = self._scan_name(i, declstartpos)
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185 c = rawdata[j:j+1]
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186 if c == "":
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187 return -1
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Richard Jones <richard@users.sourceforge.net>
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188 if c == ">":
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189 return j + 1
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Richard Jones <richard@users.sourceforge.net>
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190 while 1:
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191 # scan a series of attribute descriptions; simplified:
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192 # name type [value] [#constraint]
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193 name, j = self._scan_name(j, declstartpos)
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194 if j < 0:
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195 return j
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196 c = rawdata[j:j+1]
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parents:
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197 if c == "":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
198 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
199 if c == "(":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
200 # an enumerated type; look for ')'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
201 if ")" in rawdata[j:]:
|
|
2348
|
202 j = rawdata.find(")", j) + 1
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
203 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
204 return -1
|
|
2348
|
205 while rawdata[j:j+1].isspace():
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
206 j = j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
207 if not rawdata[j:]:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
208 # end of buffer, incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
209 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
210 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
211 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
212 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
213 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
214 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
215 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
216 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
217 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
218 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
219 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
220 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
221 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
222 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
223 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
224 if c == "#":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
225 if rawdata[j:] == "#":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
226 # end of buffer
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
227 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
228 name, j = self._scan_name(j + 1, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
229 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
230 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
231 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
232 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
233 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
234 if c == '>':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
235 # all done
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
236 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
237
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
238 # Internal -- scan past <!NOTATION declarations
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
239 def _parse_doctype_notation(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
240 name, j = self._scan_name(i, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
241 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
242 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
243 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
244 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
245 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
246 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
247 # end of buffer; incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
248 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
249 if c == '>':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
250 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
251 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
252 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
253 if not m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
254 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
255 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
256 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
257 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
258 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
259 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
260
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
261 # Internal -- scan past <!ENTITY declarations
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
262 def _parse_doctype_entity(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
263 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
264 if rawdata[i:i+1] == "%":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
265 j = i + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
266 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
267 c = rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
268 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
269 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
270 if c in string.whitespace:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
271 j = j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
272 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
273 break
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
274 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
275 j = i
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
276 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
277 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
278 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
279 while 1:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
280 c = self.rawdata[j:j+1]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
281 if not c:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
282 return -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
283 if c in "'\"":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
284 m = _declstringlit_match(rawdata, j)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
285 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
286 j = m.end()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
287 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
288 return -1 # incomplete
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
289 elif c == ">":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
290 return j + 1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
291 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
292 name, j = self._scan_name(j, declstartpos)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
293 if j < 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
294 return j
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
295
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
296 # Internal -- scan a name token and the new position and the token, or
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
297 # return -1 if we've reached the end of the buffer.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
298 def _scan_name(self, i, declstartpos):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
299 rawdata = self.rawdata
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
300 n = len(rawdata)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
301 if i == n:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
302 return None, -1
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
303 m = _declname_match(rawdata, i)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
304 if m:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
305 s = m.group()
|
|
2348
|
306 name = s.strip()
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
307 if (i + len(s)) == n:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
308 return None, -1 # end of buffer
|
|
2348
|
309 return name.lower(), m.end()
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
310 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
311 self.updatepos(declstartpos, i)
|
|
2348
|
312 self.error("expected name token")
|
