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annotate roundup/cgi/TAL/HTMLTALParser.py @ 2119:cc4667ef3f12

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Added the ability to toggle where error messages go. They either go to the user (default, for backwards compatibility), the dispatcher, or both. These are able to be toggled via settings in config.py. Please refer to upgrading.txt for more details. (And Richard, let me know if I've done anything wrong with this checkin. :))
author Eddie Parker <eparker@users.sourceforge.net>
date Thu, 25 Mar 2004 19:27:15 +0000
parents fc52d57c6c3e
children 8c2402a78bb0
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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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187 close_to = i
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188 i = i - 1
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189 if close_to >= 0:
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190 while len(self.tagstack) > close_to:
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191 self.implied_endtag(self.tagstack[-1], 1)
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192
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193 def close_enclosed_tags(self, tag):
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194 if tag not in self.tagstack:
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195 raise NestingError(self.tagstack, tag, self.getpos())
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196 while tag != self.tagstack[-1]:
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197 self.implied_endtag(self.tagstack[-1], 1)
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198 assert self.tagstack[-1] == tag
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199
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200 def implied_endtag(self, tag, implied):
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201 assert tag == self.tagstack[-1]
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202 assert implied in (-1, 1, 2)
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203 isend = (implied < 0)
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204 if tag in TIGHTEN_IMPLICIT_CLOSE_TAGS:
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205 # Pick out trailing whitespace from the program, and
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206 # insert the close tag before the whitespace.
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207 white = self.gen.unEmitWhitespace()
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208 else:
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209 white = None
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210 self.gen.emitEndElement(tag, isend=isend, implied=implied)
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211 if white:
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212 self.gen.emitRawText(white)
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213 self.tagstack.pop()
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214 self.pop_xmlns()
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215
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216 def handle_charref(self, name):
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217 self.gen.emitRawText("&#%s;" % name)
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218
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219 def handle_entityref(self, name):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
220 self.gen.emitRawText("&%s;" % name)
Richard Jones <richard@users.sourceforge.net>
parents:
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221
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
222 def handle_data(self, data):
Richard Jones <richard@users.sourceforge.net>
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diff changeset
223 self.gen.emitRawText(data)
Richard Jones <richard@users.sourceforge.net>
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224
Richard Jones <richard@users.sourceforge.net>
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225 def handle_comment(self, data):
Richard Jones <richard@users.sourceforge.net>
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diff changeset
226 self.gen.emitRawText("<!--%s-->" % data)
Richard Jones <richard@users.sourceforge.net>
parents:
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227
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
228 def handle_decl(self, data):
Richard Jones <richard@users.sourceforge.net>
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diff changeset
229 self.gen.emitRawText("<!%s>" % data)
Richard Jones <richard@users.sourceforge.net>
parents:
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230
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
231 def handle_pi(self, data):
Richard Jones <richard@users.sourceforge.net>
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232 self.gen.emitRawText("<?%s>" % data)
Richard Jones <richard@users.sourceforge.net>
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233
Richard Jones <richard@users.sourceforge.net>
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234 # Internal thingies
Richard Jones <richard@users.sourceforge.net>
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235
Richard Jones <richard@users.sourceforge.net>
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236 def scan_xmlns(self, attrs):
Richard Jones <richard@users.sourceforge.net>
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237 nsnew = {}
Richard Jones <richard@users.sourceforge.net>
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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>
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240 nsnew[key[6:]] = value
Richard Jones <richard@users.sourceforge.net>
parents:
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241 if nsnew:
Richard Jones <richard@users.sourceforge.net>
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242 self.nsstack.append(self.nsdict)
Richard Jones <richard@users.sourceforge.net>
parents:
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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>
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246 self.nsstack.append(self.nsdict)
Richard Jones <richard@users.sourceforge.net>
parents:
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247
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
248 def pop_xmlns(self):
Richard Jones <richard@users.sourceforge.net>
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249 self.nsdict = self.nsstack.pop()
Richard Jones <richard@users.sourceforge.net>
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250
Richard Jones <richard@users.sourceforge.net>
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251 def fixname(self, name):
Richard Jones <richard@users.sourceforge.net>
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252 if ':' in name:
Richard Jones <richard@users.sourceforge.net>
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253 prefix, suffix = string.split(name, ':', 1)
Richard Jones <richard@users.sourceforge.net>
parents:
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254 if prefix == 'xmlns':
Richard Jones <richard@users.sourceforge.net>
parents:
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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:
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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:
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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:
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265
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
266 def process_ns(self, name, attrs):
Richard Jones <richard@users.sourceforge.net>
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267 attrlist = []
Richard Jones <richard@users.sourceforge.net>
parents:
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268 taldict = {}
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
269 metaldict = {}
Richard Jones <richard@users.sourceforge.net>
parents:
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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
Roundup Issue Tracker: http://roundup-tracker.org/