Mercurial > genshi > genshi-test
annotate genshi/input.py @ 896:248d6671a7e1
Fix for infinite recursion when parsing argument names from tuples. Closes #383.
author | cmlenz |
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date | Wed, 21 Apr 2010 22:02:28 +0000 |
parents | fbe34d12acde |
children | 9fafb35032a1 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
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3 # Copyright (C) 2006-2009 Edgewall Software |
1 | 4 # All rights reserved. |
5 # | |
6 # This software is licensed as described in the file COPYING, which | |
7 # you should have received as part of this distribution. The terms | |
230 | 8 # are also available at http://genshi.edgewall.org/wiki/License. |
1 | 9 # |
10 # This software consists of voluntary contributions made by many | |
11 # individuals. For the exact contribution history, see the revision | |
230 | 12 # history and logs, available at http://genshi.edgewall.org/log/. |
1 | 13 |
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14 """Support for constructing markup streams from files, strings, or other |
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15 sources. |
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16 """ |
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17 |
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18 from itertools import chain |
859 | 19 import htmlentitydefs as entities |
20 import HTMLParser as html | |
21 from StringIO import StringIO | |
1 | 22 from xml.parsers import expat |
23 | |
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24 from genshi.core import Attrs, QName, Stream, stripentities |
859 | 25 from genshi.core import START, END, XML_DECL, DOCTYPE, TEXT, START_NS, \ |
26 END_NS, START_CDATA, END_CDATA, PI, COMMENT | |
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27 |
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28 __all__ = ['ET', 'ParseError', 'XMLParser', 'XML', 'HTMLParser', 'HTML'] |
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29 __docformat__ = 'restructuredtext en' |
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30 |
859 | 31 |
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32 def ET(element): |
433 | 33 """Convert a given ElementTree element to a markup stream. |
34 | |
35 :param element: an ElementTree element | |
36 :return: a markup stream | |
37 """ | |
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38 tag_name = QName(element.tag.lstrip('{')) |
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39 attrs = Attrs([(QName(attr.lstrip('{')), value) |
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40 for attr, value in element.items()]) |
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41 |
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42 yield START, (tag_name, attrs), (None, -1, -1) |
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43 if element.text: |
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44 yield TEXT, element.text, (None, -1, -1) |
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45 for child in element.getchildren(): |
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46 for item in ET(child): |
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47 yield item |
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48 yield END, tag_name, (None, -1, -1) |
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49 if element.tail: |
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50 yield TEXT, element.tail, (None, -1, -1) |
1 | 51 |
52 | |
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53 class ParseError(Exception): |
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54 """Exception raised when fatal syntax errors are found in the input being |
433 | 55 parsed. |
56 """ | |
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57 |
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58 def __init__(self, message, filename=None, lineno=-1, offset=-1): |
433 | 59 """Exception initializer. |
60 | |
61 :param message: the error message from the parser | |
62 :param filename: the path to the file that was parsed | |
63 :param lineno: the number of the line on which the error was encountered | |
64 :param offset: the column number where the error was encountered | |
65 """ | |
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66 self.msg = message |
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67 if filename: |
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68 message += ', in ' + filename |
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69 Exception.__init__(self, message) |
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70 self.filename = filename or '<string>' |
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71 self.lineno = lineno |
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72 self.offset = offset |
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73 |
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74 |
1 | 75 class XMLParser(object): |
76 """Generator-based XML parser based on roughly equivalent code in | |
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77 Kid/ElementTree. |
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78 |
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79 The parsing is initiated by iterating over the parser object: |
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80 |
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81 >>> parser = XMLParser(StringIO('<root id="2"><child>Foo</child></root>')) |
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82 >>> for kind, data, pos in parser: |
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83 ... print('%s %s' % (kind, data)) |
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84 START (QName('root'), Attrs([(QName('id'), u'2')])) |
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85 START (QName('child'), Attrs()) |
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86 TEXT Foo |
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87 END child |
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88 END root |
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89 """ |
1 | 90 |
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91 _entitydefs = ['<!ENTITY %s "&#%d;">' % (name, value) for name, value in |
856 | 92 entities.name2codepoint.items()] |
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93 _external_dtd = '\n'.join(_entitydefs) |
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94 |
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95 def __init__(self, source, filename=None, encoding=None): |
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96 """Initialize the parser for the given XML input. |
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97 |
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98 :param source: the XML text as a file-like object |
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99 :param filename: the name of the file, if appropriate |
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100 :param encoding: the encoding of the file; if not specified, the |
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101 encoding is assumed to be ASCII, UTF-8, or UTF-16, or |
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102 whatever the encoding specified in the XML declaration |
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103 (if any) |
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104 """ |
1 | 105 self.source = source |
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106 self.filename = filename |
1 | 107 |
108 # Setup the Expat parser | |
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109 parser = expat.ParserCreate(encoding, '}') |
1 | 110 parser.buffer_text = True |
111 parser.returns_unicode = True | |
160 | 112 parser.ordered_attributes = True |
113 | |
1 | 114 parser.StartElementHandler = self._handle_start |
115 parser.EndElementHandler = self._handle_end | |
116 parser.CharacterDataHandler = self._handle_data | |
117 parser.StartDoctypeDeclHandler = self._handle_doctype | |
118 parser.StartNamespaceDeclHandler = self._handle_start_ns | |
119 parser.EndNamespaceDeclHandler = self._handle_end_ns | |
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120 parser.StartCdataSectionHandler = self._handle_start_cdata |
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121 parser.EndCdataSectionHandler = self._handle_end_cdata |
1 | 122 parser.ProcessingInstructionHandler = self._handle_pi |
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123 parser.XmlDeclHandler = self._handle_xml_decl |
1 | 124 parser.CommentHandler = self._handle_comment |
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125 |
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126 # Tell Expat that we'll handle non-XML entities ourselves |
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127 # (in _handle_other) |
1 | 128 parser.DefaultHandler = self._handle_other |
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129 parser.SetParamEntityParsing(expat.XML_PARAM_ENTITY_PARSING_ALWAYS) |
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130 parser.UseForeignDTD() |
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131 parser.ExternalEntityRefHandler = self._build_foreign |
1 | 132 |
133 self.expat = parser | |
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134 self._queue = [] |
1 | 135 |
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136 def parse(self): |
433 | 137 """Generator that parses the XML source, yielding markup events. |
138 | |
139 :return: a markup event stream | |
140 :raises ParseError: if the XML text is not well formed | |
141 """ | |
144
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142 def _generate(): |
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143 try: |
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144 bufsize = 4 * 1024 # 4K |
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145 done = False |
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146 while 1: |
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147 while not done and len(self._queue) == 0: |
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148 data = self.source.read(bufsize) |
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149 if data == '': # end of data |
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150 if hasattr(self, 'expat'): |
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151 self.expat.Parse('', True) |
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152 del self.expat # get rid of circular references |
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153 done = True |
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154 else: |
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155 if isinstance(data, unicode): |
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156 data = data.encode('utf-8') |
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157 self.expat.Parse(data, False) |
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158 for event in self._queue: |
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159 yield event |
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160 self._queue = [] |
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161 if done: |
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162 break |
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163 except expat.ExpatError, e: |
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164 msg = str(e) |
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165 raise ParseError(msg, self.filename, e.lineno, e.offset) |
146 | 166 return Stream(_generate()).filter(_coalesce) |
144
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167 |
1 | 168 def __iter__(self): |
144
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169 return iter(self.parse()) |
1 | 170 |
293
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171 def _build_foreign(self, context, base, sysid, pubid): |
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172 parser = self.expat.ExternalEntityParserCreate(context) |
859 | 173 parser.ParseFile(StringIO(self._external_dtd)) |
293
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174 return 1 |
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175 |
143
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176 def _enqueue(self, kind, data=None, pos=None): |
26
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177 if pos is None: |
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178 pos = self._getpos() |
144
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179 if kind is TEXT: |
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180 # Expat reports the *end* of the text event as current position. We |
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181 # try to fix that up here as much as possible. Unfortunately, the |
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182 # offset is only valid for single-line text. For multi-line text, |
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183 # it is apparently not possible to determine at what offset it |
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184 # started |
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185 if '\n' in data: |
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186 lines = data.splitlines() |
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187 lineno = pos[1] - len(lines) + 1 |
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188 offset = -1 |
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189 else: |
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190 lineno = pos[1] |
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191 offset = pos[2] - len(data) |
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192 pos = (pos[0], lineno, offset) |
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193 self._queue.append((kind, data, pos)) |
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194 |
1 | 195 def _getpos_unknown(self): |
134
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196 return (self.filename, -1, -1) |
1 | 197 |
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198 def _getpos(self): |
134
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199 return (self.filename, self.expat.CurrentLineNumber, |
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200 self.expat.CurrentColumnNumber) |
1 | 201 |
202 def _handle_start(self, tag, attrib): | |
403
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203 attrs = Attrs([(QName(name), value) for name, value in |
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204 zip(*[iter(attrib)] * 2)]) |
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205 self._enqueue(START, (QName(tag), attrs)) |
1 | 206 |
207 def _handle_end(self, tag): | |
144
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208 self._enqueue(END, QName(tag)) |
1 | 209 |
210 def _handle_data(self, text): | |
144
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211 self._enqueue(TEXT, text) |
1 | 212 |
460
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213 def _handle_xml_decl(self, version, encoding, standalone): |
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214 self._enqueue(XML_DECL, (version, encoding, standalone)) |
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215 |
1 | 216 def _handle_doctype(self, name, sysid, pubid, has_internal_subset): |
144
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217 self._enqueue(DOCTYPE, (name, pubid, sysid)) |
1 | 218 |
219 def _handle_start_ns(self, prefix, uri): | |
144
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220 self._enqueue(START_NS, (prefix or '', uri)) |
1 | 221 |
222 def _handle_end_ns(self, prefix): | |
144
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223 self._enqueue(END_NS, prefix or '') |
1 | 224 |
143
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225 def _handle_start_cdata(self): |
144
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226 self._enqueue(START_CDATA) |
143
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227 |
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228 def _handle_end_cdata(self): |
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229 self._enqueue(END_CDATA) |
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230 |
1 | 231 def _handle_pi(self, target, data): |
144
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232 self._enqueue(PI, (target, data)) |
1 | 233 |
234 def _handle_comment(self, text): | |
144
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235 self._enqueue(COMMENT, text) |
1 | 236 |
237 def _handle_other(self, text): | |
238 if text.startswith('&'): | |
239 # deal with undefined entities | |
240 try: | |
856 | 241 text = unichr(entities.name2codepoint[text[1:-1]]) |
144
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242 self._enqueue(TEXT, text) |
1 | 243 except KeyError: |
209
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244 filename, lineno, offset = self._getpos() |
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245 error = expat.error('undefined entity "%s": line %d, column %d' |
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246 % (text, lineno, offset)) |
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247 error.code = expat.errors.XML_ERROR_UNDEFINED_ENTITY |
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248 error.lineno = lineno |
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249 error.offset = offset |
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250 raise error |
1 | 251 |
252 | |
253 def XML(text): | |
433 | 254 """Parse the given XML source and return a markup stream. |
255 | |
256 Unlike with `XMLParser`, the returned stream is reusable, meaning it can be | |
257 iterated over multiple times: | |
258 | |
259 >>> xml = XML('<doc><elem>Foo</elem><elem>Bar</elem></doc>') | |
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260 >>> print(xml) |
433 | 261 <doc><elem>Foo</elem><elem>Bar</elem></doc> |
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262 >>> print(xml.select('elem')) |
433 | 263 <elem>Foo</elem><elem>Bar</elem> |
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264 >>> print(xml.select('elem/text()')) |
433 | 265 FooBar |
266 | |
267 :param text: the XML source | |
268 :return: the parsed XML event stream | |
269 :raises ParseError: if the XML text is not well-formed | |
270 """ | |
859 | 271 return Stream(list(XMLParser(StringIO(text)))) |
1 | 272 |
273 | |
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274 class HTMLParser(html.HTMLParser, object): |
1 | 275 """Parser for HTML input based on the Python `HTMLParser` module. |
276 | |
277 This class provides the same interface for generating stream events as | |
278 `XMLParser`, and attempts to automatically balance tags. | |
26
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279 |
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280 The parsing is initiated by iterating over the parser object: |
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281 |
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282 >>> parser = HTMLParser(StringIO('<UL compact><LI>Foo</UL>')) |
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283 >>> for kind, data, pos in parser: |
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284 ... print('%s %s' % (kind, data)) |
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285 START (QName('ul'), Attrs([(QName('compact'), u'compact')])) |
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286 START (QName('li'), Attrs()) |
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287 TEXT Foo |
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288 END li |
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289 END ul |
1 | 290 """ |
291 | |
292 _EMPTY_ELEMS = frozenset(['area', 'base', 'basefont', 'br', 'col', 'frame', | |
293 'hr', 'img', 'input', 'isindex', 'link', 'meta', | |
294 'param']) | |
295 | |
311
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296 def __init__(self, source, filename=None, encoding='utf-8'): |
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297 """Initialize the parser for the given HTML input. |
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298 |
425
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299 :param source: the HTML text as a file-like object |
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300 :param filename: the name of the file, if known |
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301 :param filename: encoding of the file; ignored if the input is unicode |
311
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302 """ |
1 | 303 html.HTMLParser.__init__(self) |
304 self.source = source | |
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305 self.filename = filename |
311
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306 self.encoding = encoding |
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307 self._queue = [] |
1 | 308 self._open_tags = [] |
309 | |
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310 def parse(self): |
433 | 311 """Generator that parses the HTML source, yielding markup events. |
312 | |
313 :return: a markup event stream | |
314 :raises ParseError: if the HTML text is not well formed | |
315 """ | |
144
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316 def _generate(): |
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317 try: |
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318 bufsize = 4 * 1024 # 4K |
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319 done = False |
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320 while 1: |
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321 while not done and len(self._queue) == 0: |
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322 data = self.source.read(bufsize) |
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323 if data == '': # end of data |
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324 self.close() |
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325 done = True |
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326 else: |
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327 self.feed(data) |
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328 for kind, data, pos in self._queue: |
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329 yield kind, data, pos |
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330 self._queue = [] |
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331 if done: |
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332 open_tags = self._open_tags |
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333 open_tags.reverse() |
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334 for tag in open_tags: |
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335 yield END, QName(tag), pos |
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336 break |
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337 except html.HTMLParseError, e: |
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338 msg = '%s: line %d, column %d' % (e.msg, e.lineno, e.offset) |
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339 raise ParseError(msg, self.filename, e.lineno, e.offset) |
146 | 340 return Stream(_generate()).filter(_coalesce) |
144
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341 |
1 | 342 def __iter__(self): |
144
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343 return iter(self.parse()) |
21
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344 |
26
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345 def _enqueue(self, kind, data, pos=None): |
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346 if pos is None: |
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347 pos = self._getpos() |
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348 self._queue.append((kind, data, pos)) |
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349 |
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350 def _getpos(self): |
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351 lineno, column = self.getpos() |
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352 return (self.filename, lineno, column) |
1 | 353 |
354 def handle_starttag(self, tag, attrib): | |
26
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355 fixed_attrib = [] |
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356 for name, value in attrib: # Fixup minimized attributes |
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357 if value is None: |
312
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358 value = unicode(name) |
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359 elif not isinstance(value, unicode): |
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360 value = value.decode(self.encoding, 'replace') |
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361 fixed_attrib.append((QName(name), stripentities(value))) |
26
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362 |
182
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363 self._enqueue(START, (QName(tag), Attrs(fixed_attrib))) |
1 | 364 if tag in self._EMPTY_ELEMS: |
144
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365 self._enqueue(END, QName(tag)) |
1 | 366 else: |
367 self._open_tags.append(tag) | |
368 | |
369 def handle_endtag(self, tag): | |
370 if tag not in self._EMPTY_ELEMS: | |
371 while self._open_tags: | |
372 open_tag = self._open_tags.pop() | |
378
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373 self._enqueue(END, QName(open_tag)) |
1 | 374 if open_tag.lower() == tag.lower(): |
375 break | |
376 | |
377 def handle_data(self, text): | |
311
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378 if not isinstance(text, unicode): |
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379 text = text.decode(self.encoding, 'replace') |
144
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380 self._enqueue(TEXT, text) |
1 | 381 |
382 def handle_charref(self, name): | |
423
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383 if name.lower().startswith('x'): |
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384 text = unichr(int(name[1:], 16)) |
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385 else: |
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386 text = unichr(int(name)) |
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387 self._enqueue(TEXT, text) |
1 | 388 |
389 def handle_entityref(self, name): | |
144
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390 try: |
856 | 391 text = unichr(entities.name2codepoint[name]) |
144
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392 except KeyError: |
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393 text = '&%s;' % name |
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394 self._enqueue(TEXT, text) |
1 | 395 |
396 def handle_pi(self, data): | |
376
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397 target, data = data.split(None, 1) |
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398 if data.endswith('?'): |
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399 data = data[:-1] |
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400 self._enqueue(PI, (target.strip(), data.strip())) |
1 | 401 |
402 def handle_comment(self, text): | |
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403 self._enqueue(COMMENT, text) |
1 | 404 |
405 | |
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406 def HTML(text, encoding='utf-8'): |
433 | 407 """Parse the given HTML source and return a markup stream. |
408 | |
409 Unlike with `HTMLParser`, the returned stream is reusable, meaning it can be | |
410 iterated over multiple times: | |
411 | |
412 >>> html = HTML('<body><h1>Foo</h1></body>') | |
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413 >>> print(html) |
433 | 414 <body><h1>Foo</h1></body> |
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415 >>> print(html.select('h1')) |
433 | 416 <h1>Foo</h1> |
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417 >>> print(html.select('h1/text()')) |
433 | 418 Foo |
419 | |
420 :param text: the HTML source | |
421 :return: the parsed XML event stream | |
422 :raises ParseError: if the HTML text is not well-formed, and error recovery | |
423 fails | |
424 """ | |
859 | 425 return Stream(list(HTMLParser(StringIO(text), encoding=encoding))) |
426 | |
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427 |
146 | 428 def _coalesce(stream): |
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429 """Coalesces adjacent TEXT events into a single event.""" |
146 | 430 textbuf = [] |
431 textpos = None | |
432 for kind, data, pos in chain(stream, [(None, None, None)]): | |
433 if kind is TEXT: | |
434 textbuf.append(data) | |
435 if textpos is None: | |
436 textpos = pos | |
437 else: | |
438 if textbuf: | |
852
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439 yield TEXT, ''.join(textbuf), textpos |
146 | 440 del textbuf[:] |
441 textpos = None | |
442 if kind: | |
443 yield kind, data, pos |