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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001, 2002 Zope Corporation and Contributors.
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the Zope Public License,
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7 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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11 # FOR A PARTICULAR PURPOSE
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12 #
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13 ##############################################################################
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14 """Parse HTML and compile to TALInterpreter intermediate code.
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15 """
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16 __docformat__ = 'restructuredtext'
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17
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18 import sys
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19 import string
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20
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21 from TALGenerator import TALGenerator
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22 from TALDefs import ZOPE_METAL_NS, ZOPE_TAL_NS, METALError, TALError
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23 from HTMLParser import HTMLParser, HTMLParseError
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24
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25 BOOLEAN_HTML_ATTRS = [
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26 # List of Boolean attributes in HTML that may be given in
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27 # minimized form (e.g. <img ismap> rather than <img ismap="">)
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28 # From http://www.w3.org/TR/xhtml1/#guidelines (C.10)
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29 "compact", "nowrap", "ismap", "declare", "noshade", "checked",
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30 "disabled", "readonly", "multiple", "selected", "noresize",
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31 "defer"
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32 ]
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33
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34 EMPTY_HTML_TAGS = [
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35 # List of HTML tags with an empty content model; these are
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36 # rendered in minimized form, e.g. <img />.
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37 # From http://www.w3.org/TR/xhtml1/#dtds
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38 "base", "meta", "link", "hr", "br", "param", "img", "area",
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39 "input", "col", "basefont", "isindex", "frame",
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40 ]
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41
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42 PARA_LEVEL_HTML_TAGS = [
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43 # List of HTML elements that close open paragraph-level elements
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44 # and are themselves paragraph-level.
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45 "h1", "h2", "h3", "h4", "h5", "h6", "p",
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46 ]
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47
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48 BLOCK_CLOSING_TAG_MAP = {
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49 "tr": ("tr", "td", "th"),
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50 "td": ("td", "th"),
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51 "th": ("td", "th"),
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52 "li": ("li",),
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53 "dd": ("dd", "dt"),
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54 "dt": ("dd", "dt"),
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55 }
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56
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57 BLOCK_LEVEL_HTML_TAGS = [
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58 # List of HTML tags that denote larger sections than paragraphs.
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59 "blockquote", "table", "tr", "th", "td", "thead", "tfoot", "tbody",
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60 "noframe", "ul", "ol", "li", "dl", "dt", "dd", "div",
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61 ]
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62
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63 TIGHTEN_IMPLICIT_CLOSE_TAGS = (PARA_LEVEL_HTML_TAGS
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64 + BLOCK_CLOSING_TAG_MAP.keys())
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65
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66
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67 class NestingError(HTMLParseError):
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68 """Exception raised when elements aren't properly nested."""
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69
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70 def __init__(self, tagstack, endtag, position=(None, None)):
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71 self.endtag = endtag
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72 if tagstack:
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73 if len(tagstack) == 1:
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74 msg = ('Open tag <%s> does not match close tag </%s>'
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75 % (tagstack[0], endtag))
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76 else:
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77 msg = ('Open tags <%s> do not match close tag </%s>'
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78 % (string.join(tagstack, '>, <'), endtag))
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79 else:
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80 msg = 'No tags are open to match </%s>' % endtag
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81 HTMLParseError.__init__(self, msg, position)
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82
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83 class EmptyTagError(NestingError):
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84 """Exception raised when empty elements have an end tag."""
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85
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86 def __init__(self, tag, position=(None, None)):
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87 self.tag = tag
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88 msg = 'Close tag </%s> should be removed' % tag
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89 HTMLParseError.__init__(self, msg, position)
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90
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91 class OpenTagError(NestingError):
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92 """Exception raised when a tag is not allowed in another tag."""
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93
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94 def __init__(self, tagstack, tag, position=(None, None)):
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95 self.tag = tag
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96 msg = 'Tag <%s> is not allowed in <%s>' % (tag, tagstack[-1])
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97 HTMLParseError.__init__(self, msg, position)
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98
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99 class HTMLTALParser(HTMLParser):
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100
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101 # External API
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102
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103 def __init__(self, gen=None):
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104 HTMLParser.__init__(self)
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105 if gen is None:
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106 gen = TALGenerator(xml=0)
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107 self.gen = gen
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108 self.tagstack = []
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109 self.nsstack = []
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110 self.nsdict = {'tal': ZOPE_TAL_NS, 'metal': ZOPE_METAL_NS}
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111
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112 def parseFile(self, file):
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113 f = open(file)
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114 data = f.read()
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115 f.close()
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116 self.parseString(data)
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117
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118 def parseString(self, data):
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119 self.feed(data)
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120 self.close()
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121 while self.tagstack:
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122 self.implied_endtag(self.tagstack[-1], 2)
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123 assert self.nsstack == [], self.nsstack
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124
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125 def getCode(self):
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126 return self.gen.getCode()
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127
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128 def getWarnings(self):
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129 return ()
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130
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131 # Overriding HTMLParser methods
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132
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133 def handle_starttag(self, tag, attrs):
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134 self.close_para_tags(tag)
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135 self.scan_xmlns(attrs)
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136 tag, attrlist, taldict, metaldict = self.process_ns(tag, attrs)
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137 self.tagstack.append(tag)
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138 self.gen.emitStartElement(tag, attrlist, taldict, metaldict,
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139 self.getpos())
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140 if tag in EMPTY_HTML_TAGS:
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141 self.implied_endtag(tag, -1)
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142
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143 def handle_startendtag(self, tag, attrs):
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144 self.close_para_tags(tag)
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145 self.scan_xmlns(attrs)
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146 tag, attrlist, taldict, metaldict = self.process_ns(tag, attrs)
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147 if taldict.get("content"):
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148 self.gen.emitStartElement(tag, attrlist, taldict, metaldict,
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149 self.getpos())
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150 self.gen.emitEndElement(tag, implied=-1)
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151 else:
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152 self.gen.emitStartElement(tag, attrlist, taldict, metaldict,
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153 self.getpos(), isend=1)
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154 self.pop_xmlns()
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155
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156 def handle_endtag(self, tag):
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157 if tag in EMPTY_HTML_TAGS:
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158 # </img> etc. in the source is an error
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159 raise EmptyTagError(tag, self.getpos())
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160 self.close_enclosed_tags(tag)
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161 self.gen.emitEndElement(tag)
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162 self.pop_xmlns()
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163 self.tagstack.pop()
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164
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165 def close_para_tags(self, tag):
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166 if tag in EMPTY_HTML_TAGS:
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167 return
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168 close_to = -1
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169 if BLOCK_CLOSING_TAG_MAP.has_key(tag):
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170 blocks_to_close = BLOCK_CLOSING_TAG_MAP[tag]
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171 for i in range(len(self.tagstack)):
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172 t = self.tagstack[i]
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173 if t in blocks_to_close:
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174 if close_to == -1:
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175 close_to = i
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176 elif t in BLOCK_LEVEL_HTML_TAGS:
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177 close_to = -1
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178 elif tag in PARA_LEVEL_HTML_TAGS + BLOCK_LEVEL_HTML_TAGS:
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179 i = len(self.tagstack) - 1
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180 while i >= 0:
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181 closetag = self.tagstack[i]
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182 if closetag in BLOCK_LEVEL_HTML_TAGS:
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183 break
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184 if closetag in PARA_LEVEL_HTML_TAGS:
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185 if closetag != "p":
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186 raise OpenTagError(self.tagstack, tag, self.getpos())
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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187 close_to = i
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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188 i = i - 1
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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189 if close_to >= 0:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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190 while len(self.tagstack) > close_to:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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191 self.implied_endtag(self.tagstack[-1], 1)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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192
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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193 def close_enclosed_tags(self, tag):
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Richard Jones <richard@users.sourceforge.net>
parents:
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194 if tag not in self.tagstack:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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195 raise NestingError(self.tagstack, tag, self.getpos())
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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196 while tag != self.tagstack[-1]:
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Richard Jones <richard@users.sourceforge.net>
parents:
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197 self.implied_endtag(self.tagstack[-1], 1)
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Richard Jones <richard@users.sourceforge.net>
parents:
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198 assert self.tagstack[-1] == tag
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Richard Jones <richard@users.sourceforge.net>
parents:
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199
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Richard Jones <richard@users.sourceforge.net>
parents:
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200 def implied_endtag(self, tag, implied):
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Richard Jones <richard@users.sourceforge.net>
parents:
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201 assert tag == self.tagstack[-1]
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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202 assert implied in (-1, 1, 2)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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203 isend = (implied < 0)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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204 if tag in TIGHTEN_IMPLICIT_CLOSE_TAGS:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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205 # Pick out trailing whitespace from the program, and
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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206 # insert the close tag before the whitespace.
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Richard Jones <richard@users.sourceforge.net>
parents:
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207 white = self.gen.unEmitWhitespace()
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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208 else:
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Richard Jones <richard@users.sourceforge.net>
parents:
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209 white = None
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Richard Jones <richard@users.sourceforge.net>
parents:
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210 self.gen.emitEndElement(tag, isend=isend, implied=implied)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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211 if white:
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Richard Jones <richard@users.sourceforge.net>
parents:
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212 self.gen.emitRawText(white)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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213 self.tagstack.pop()
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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214 self.pop_xmlns()
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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215
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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216 def handle_charref(self, name):
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Richard Jones <richard@users.sourceforge.net>
parents:
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217 self.gen.emitRawText("&#%s;" % name)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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218
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
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219 def handle_entityref(self, name):
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Richard Jones <richard@users.sourceforge.net>
parents:
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220 self.gen.emitRawText("&%s;" % name)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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221
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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222 def handle_data(self, data):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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223 self.gen.emitRawText(data)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
224
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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225 def handle_comment(self, data):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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226 self.gen.emitRawText("<!--%s-->" % data)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
227
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
228 def handle_decl(self, data):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
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229 self.gen.emitRawText("<!%s>" % data)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
230
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
231 def handle_pi(self, data):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
232 self.gen.emitRawText("<?%s>" % data)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
233
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
234 # Internal thingies
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
235
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
236 def scan_xmlns(self, attrs):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
237 nsnew = {}
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
238 for key, value in attrs:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
239 if key[:6] == "xmlns:":
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
240 nsnew[key[6:]] = value
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
241 if nsnew:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
242 self.nsstack.append(self.nsdict)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
243 self.nsdict = self.nsdict.copy()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
244 self.nsdict.update(nsnew)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
245 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
246 self.nsstack.append(self.nsdict)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
247
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
248 def pop_xmlns(self):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
249 self.nsdict = self.nsstack.pop()
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
250
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
251 def fixname(self, name):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
252 if ':' in name:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
253 prefix, suffix = string.split(name, ':', 1)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
254 if prefix == 'xmlns':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
255 nsuri = self.nsdict.get(suffix)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
256 if nsuri in (ZOPE_TAL_NS, ZOPE_METAL_NS):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
257 return name, name, prefix
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
258 else:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
259 nsuri = self.nsdict.get(prefix)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
260 if nsuri == ZOPE_TAL_NS:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
261 return name, suffix, 'tal'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
262 elif nsuri == ZOPE_METAL_NS:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
263 return name, suffix, 'metal'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
264 return name, name, 0
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
265
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
266 def process_ns(self, name, attrs):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
267 attrlist = []
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
268 taldict = {}
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
269 metaldict = {}
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
270 name, namebase, namens = self.fixname(name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
271 for item in attrs:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
272 key, value = item
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
273 key, keybase, keyns = self.fixname(key)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
274 ns = keyns or namens # default to tag namespace
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
275 if ns and ns != 'unknown':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
276 item = (key, value, ns)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
277 if ns == 'tal':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
278 if taldict.has_key(keybase):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
279 raise TALError("duplicate TAL attribute " +
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
280 `keybase`, self.getpos())
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
281 taldict[keybase] = value
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
282 elif ns == 'metal':
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
283 if metaldict.has_key(keybase):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
284 raise METALError("duplicate METAL attribute " +
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
285 `keybase`, self.getpos())
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
286 metaldict[keybase] = value
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
287 attrlist.append(item)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
288 if namens in ('metal', 'tal'):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
289 taldict['tal tag'] = namens
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
290 return name, attrlist, taldict, metaldict
|
