Mercurial > genshi > mirror
annotate genshi/output.py @ 345:2aa7ca37ae6a trunk
Make `Attrs` instances immutable.
author | cmlenz |
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date | Fri, 10 Nov 2006 15:27:36 +0000 |
parents | 60111a041e7c |
children | 96882a191686 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
66
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Switch copyright to Edgewall and URLs to markup.edgewall.org.
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3 # Copyright (C) 2006 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 |
14 """This module provides different kinds of serialization methods for XML event | |
15 streams. | |
16 """ | |
17 | |
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18 from itertools import chain |
1 | 19 try: |
20 frozenset | |
21 except NameError: | |
22 from sets import ImmutableSet as frozenset | |
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23 import re |
1 | 24 |
230 | 25 from genshi.core import escape, Markup, Namespace, QName, StreamEventKind |
26 from genshi.core import DOCTYPE, START, END, START_NS, TEXT, START_CDATA, \ | |
145
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* Fix error in expression evaluation when the expression evaluates to an iterable that does not produce event tuples.
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27 END_CDATA, PI, COMMENT, XML_NAMESPACE |
1 | 28 |
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Add serialization to plain text, based on cboos' patch. Closes #41.
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29 __all__ = ['DocType', 'XMLSerializer', 'XHTMLSerializer', 'HTMLSerializer', |
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30 'TextSerializer'] |
1 | 31 |
32 | |
85 | 33 class DocType(object): |
34 """Defines a number of commonly used DOCTYPE declarations as constants.""" | |
35 | |
36 HTML_STRICT = ('html', '-//W3C//DTD HTML 4.01//EN', | |
37 'http://www.w3.org/TR/html4/strict.dtd') | |
38 HTML_TRANSITIONAL = ('html', '-//W3C//DTD HTML 4.01 Transitional//EN', | |
39 'http://www.w3.org/TR/html4/loose.dtd') | |
40 HTML = HTML_STRICT | |
41 | |
42 XHTML_STRICT = ('html', '-//W3C//DTD XHTML 1.0 Strict//EN', | |
43 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd') | |
44 XHTML_TRANSITIONAL = ('html', '-//W3C//DTD XHTML 1.0 Transitional//EN', | |
45 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd') | |
46 XHTML = XHTML_STRICT | |
47 | |
48 | |
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49 class XMLSerializer(object): |
1 | 50 """Produces XML text from an event stream. |
51 | |
230 | 52 >>> from genshi.builder import tag |
20 | 53 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
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54 >>> print ''.join(XMLSerializer()(elem.generate())) |
1 | 55 <div><a href="foo"/><br/><hr noshade="True"/></div> |
56 """ | |
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57 |
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58 _PRESERVE_SPACE = frozenset() |
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59 |
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60 def __init__(self, doctype=None, strip_whitespace=True): |
85 | 61 """Initialize the XML serializer. |
62 | |
63 @param doctype: a `(name, pubid, sysid)` tuple that represents the | |
64 DOCTYPE declaration that should be included at the top of the | |
65 generated output | |
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66 @param strip_whitespace: whether extraneous whitespace should be |
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67 stripped from the output |
85 | 68 """ |
69 self.preamble = [] | |
70 if doctype: | |
71 self.preamble.append((DOCTYPE, doctype, (None, -1, -1))) | |
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72 self.filters = [EmptyTagFilter()] |
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73 if strip_whitespace: |
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74 self.filters.append(WhitespaceFilter(self._PRESERVE_SPACE)) |
1 | 75 |
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76 def __call__(self, stream): |
1 | 77 ns_attrib = [] |
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78 ns_mapping = {XML_NAMESPACE.uri: 'xml'} |
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CDATA sections in XML input now appear as CDATA sections in the output. This should address the problem with escaping the contents of `<style>` and `<script>` elements, which would only get interpreted correctly if the output was served as `application/xhtml+xml`. Closes #24.
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79 have_doctype = False |
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80 in_cdata = False |
1 | 81 |
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82 stream = chain(self.preamble, stream) |
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83 for filter_ in self.filters: |
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84 stream = filter_(stream) |
1 | 85 for kind, data, pos in stream: |
86 | |
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87 if kind is START or kind is EMPTY: |
1 | 88 tag, attrib = data |
89 | |
90 tagname = tag.localname | |
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91 namespace = tag.namespace |
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92 if namespace: |
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93 if namespace in ns_mapping: |
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94 prefix = ns_mapping[namespace] |
1 | 95 if prefix: |
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96 tagname = '%s:%s' % (prefix, tagname) |
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97 else: |
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98 ns_attrib.append((QName('xmlns'), namespace)) |
136 | 99 buf = ['<', tagname] |
1 | 100 |
345 | 101 for attr, value in attrib + tuple(ns_attrib): |
1 | 102 attrname = attr.localname |
103 if attr.namespace: | |
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104 prefix = ns_mapping.get(attr.namespace) |
1 | 105 if prefix: |
69 | 106 attrname = '%s:%s' % (prefix, attrname) |
136 | 107 buf += [' ', attrname, '="', escape(value), '"'] |
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108 ns_attrib = [] |
1 | 109 |
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110 if kind is EMPTY: |
136 | 111 buf += ['/>'] |
1 | 112 else: |
136 | 113 buf += ['>'] |
1 | 114 |
115 yield Markup(''.join(buf)) | |
116 | |
69 | 117 elif kind is END: |
1 | 118 tag = data |
119 tagname = tag.localname | |
120 if tag.namespace: | |
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121 prefix = ns_mapping.get(tag.namespace) |
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122 if prefix: |
69 | 123 tagname = '%s:%s' % (prefix, tag.localname) |
1 | 124 yield Markup('</%s>' % tagname) |
125 | |
69 | 126 elif kind is TEXT: |
143
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127 if in_cdata: |
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128 yield data |
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129 else: |
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130 yield escape(data, quotes=False) |
1 | 131 |
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132 elif kind is COMMENT: |
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133 yield Markup('<!--%s-->' % data) |
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134 |
136 | 135 elif kind is DOCTYPE and not have_doctype: |
136 name, pubid, sysid = data | |
137 buf = ['<!DOCTYPE %s'] | |
138 if pubid: | |
139 buf += [' PUBLIC "%s"'] | |
140 elif sysid: | |
141 buf += [' SYSTEM'] | |
142 if sysid: | |
143 buf += [' "%s"'] | |
144 buf += ['>\n'] | |
145 yield Markup(''.join(buf), *filter(None, data)) | |
146 have_doctype = True | |
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147 |
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148 elif kind is START_NS: |
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149 prefix, uri = data |
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150 if uri not in ns_mapping: |
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151 ns_mapping[uri] = prefix |
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152 if not prefix: |
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153 ns_attrib.append((QName('xmlns'), uri)) |
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154 else: |
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155 ns_attrib.append((QName('xmlns:%s' % prefix), uri)) |
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156 |
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157 elif kind is START_CDATA: |
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158 yield Markup('<![CDATA[') |
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159 in_cdata = True |
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160 |
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161 elif kind is END_CDATA: |
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162 yield Markup(']]>') |
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163 in_cdata = False |
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164 |
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165 elif kind is PI: |
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166 yield Markup('<?%s %s?>' % data) |
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167 |
1 | 168 |
96
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169 class XHTMLSerializer(XMLSerializer): |
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170 """Produces XHTML text from an event stream. |
1 | 171 |
230 | 172 >>> from genshi.builder import tag |
20 | 173 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
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174 >>> print ''.join(XHTMLSerializer()(elem.generate())) |
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175 <div><a href="foo"></a><br /><hr noshade="noshade" /></div> |
1 | 176 """ |
177 | |
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178 NAMESPACE = Namespace('http://www.w3.org/1999/xhtml') |
1 | 179 |
180 _EMPTY_ELEMS = frozenset(['area', 'base', 'basefont', 'br', 'col', 'frame', | |
181 'hr', 'img', 'input', 'isindex', 'link', 'meta', | |
182 'param']) | |
183 _BOOLEAN_ATTRS = frozenset(['selected', 'checked', 'compact', 'declare', | |
184 'defer', 'disabled', 'ismap', 'multiple', | |
185 'nohref', 'noresize', 'noshade', 'nowrap']) | |
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186 _PRESERVE_SPACE = frozenset([QName('pre'), QName('textarea')]) |
1 | 187 |
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188 def __call__(self, stream): |
136 | 189 namespace = self.NAMESPACE |
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190 ns_attrib = [] |
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191 ns_mapping = {XML_NAMESPACE.uri: 'xml'} |
136 | 192 boolean_attrs = self._BOOLEAN_ATTRS |
193 empty_elems = self._EMPTY_ELEMS | |
85 | 194 have_doctype = False |
143
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195 in_cdata = False |
1 | 196 |
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197 stream = chain(self.preamble, stream) |
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198 for filter_ in self.filters: |
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199 stream = filter_(stream) |
1 | 200 for kind, data, pos in stream: |
201 | |
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202 if kind is START or kind is EMPTY: |
1 | 203 tag, attrib = data |
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204 |
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205 tagname = tag.localname |
177
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206 tagns = tag.namespace |
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207 if tagns: |
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208 if tagns in ns_mapping: |
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209 prefix = ns_mapping[tagns] |
141
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210 if prefix: |
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211 tagname = '%s:%s' % (prefix, tagname) |
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212 else: |
177
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213 ns_attrib.append((QName('xmlns'), tagns)) |
141
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214 buf = ['<', tagname] |
136 | 215 |
345 | 216 for attr, value in chain(attrib, ns_attrib): |
141
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217 attrname = attr.localname |
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218 if attr.namespace: |
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219 prefix = ns_mapping.get(attr.namespace) |
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220 if prefix: |
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221 attrname = '%s:%s' % (prefix, attrname) |
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222 if attrname in boolean_attrs: |
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223 if value: |
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224 buf += [' ', attrname, '="', attrname, '"'] |
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225 else: |
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226 buf += [' ', attrname, '="', escape(value), '"'] |
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227 ns_attrib = [] |
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228 |
212
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229 if kind is EMPTY: |
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230 if (tagns and tagns != namespace.uri) \ |
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231 or tag.localname in empty_elems: |
141
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232 buf += [' />'] |
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233 else: |
212
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234 buf += ['></%s>' % tagname] |
141
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235 else: |
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236 buf += ['>'] |
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237 |
141
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238 yield Markup(''.join(buf)) |
96
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239 |
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240 elif kind is END: |
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241 tag = data |
141
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242 tagname = tag.localname |
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243 if tag.namespace: |
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244 prefix = ns_mapping.get(tag.namespace) |
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245 if prefix: |
177
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246 tagname = '%s:%s' % (prefix, tagname) |
141
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247 yield Markup('</%s>' % tagname) |
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248 |
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249 elif kind is TEXT: |
143
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250 if in_cdata: |
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251 yield data |
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252 else: |
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253 yield escape(data, quotes=False) |
96
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254 |
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255 elif kind is COMMENT: |
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256 yield Markup('<!--%s-->' % data) |
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257 |
136 | 258 elif kind is DOCTYPE and not have_doctype: |
259 name, pubid, sysid = data | |
260 buf = ['<!DOCTYPE %s'] | |
261 if pubid: | |
262 buf += [' PUBLIC "%s"'] | |
263 elif sysid: | |
264 buf += [' SYSTEM'] | |
265 if sysid: | |
266 buf += [' "%s"'] | |
267 buf += ['>\n'] | |
268 yield Markup(''.join(buf), *filter(None, data)) | |
269 have_doctype = True | |
109
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270 |
141
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271 elif kind is START_NS: |
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272 prefix, uri = data |
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273 if uri not in ns_mapping: |
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274 ns_mapping[uri] = prefix |
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275 if not prefix: |
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276 ns_attrib.append((QName('xmlns'), uri)) |
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277 else: |
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278 ns_attrib.append((QName('xmlns:%s' % prefix), uri)) |
109
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279 |
143
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280 elif kind is START_CDATA: |
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281 yield Markup('<![CDATA[') |
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282 in_cdata = True |
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283 |
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284 elif kind is END_CDATA: |
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285 yield Markup(']]>') |
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286 in_cdata = False |
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287 |
105
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288 elif kind is PI: |
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289 yield Markup('<?%s %s?>' % data) |
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290 |
96
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291 |
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292 class HTMLSerializer(XHTMLSerializer): |
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293 """Produces HTML text from an event stream. |
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294 |
230 | 295 >>> from genshi.builder import tag |
96
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296 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
123
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297 >>> print ''.join(HTMLSerializer()(elem.generate())) |
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298 <div><a href="foo"></a><br><hr noshade></div> |
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299 """ |
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300 |
280
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diff
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301 _NOESCAPE_ELEMS = frozenset([QName('script'), |
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302 QName('http://www.w3.org/1999/xhtml}script'), |
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303 QName('style'), |
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304 QName('http://www.w3.org/1999/xhtml}style')]) |
141
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305 |
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306 def __init__(self, doctype=None, strip_whitespace=True): |
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307 """Initialize the HTML serializer. |
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308 |
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309 @param doctype: a `(name, pubid, sysid)` tuple that represents the |
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310 DOCTYPE declaration that should be included at the top of the |
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311 generated output |
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312 @param strip_whitespace: whether extraneous whitespace should be |
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313 stripped from the output |
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314 """ |
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315 super(HTMLSerializer, self).__init__(doctype, False) |
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316 if strip_whitespace: |
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317 self.filters.append(WhitespaceFilter(self._PRESERVE_SPACE, |
305 | 318 self._NOESCAPE_ELEMS)) |
141
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319 |
123
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320 def __call__(self, stream): |
136 | 321 namespace = self.NAMESPACE |
322 ns_mapping = {} | |
323 boolean_attrs = self._BOOLEAN_ATTRS | |
324 empty_elems = self._EMPTY_ELEMS | |
141
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325 noescape_elems = self._NOESCAPE_ELEMS |
96
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326 have_doctype = False |
141
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327 noescape = False |
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328 |
123
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329 stream = chain(self.preamble, stream) |
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330 for filter_ in self.filters: |
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331 stream = filter_(stream) |
96
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332 for kind, data, pos in stream: |
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333 |
212
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334 if kind is START or kind is EMPTY: |
96
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335 tag, attrib = data |
136 | 336 if not tag.namespace or tag in namespace: |
337 tagname = tag.localname | |
338 buf = ['<', tagname] | |
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339 |
136 | 340 for attr, value in attrib: |
341 attrname = attr.localname | |
141
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342 if not attr.namespace or attr in namespace: |
136 | 343 if attrname in boolean_attrs: |
344 if value: | |
345 buf += [' ', attrname] | |
346 else: | |
347 buf += [' ', attrname, '="', escape(value), '"'] | |
1 | 348 |
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349 buf += ['>'] |
1 | 350 |
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351 if kind is EMPTY: |
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352 if tagname not in empty_elems: |
213 | 353 buf += ['</%s>' % tagname] |
212
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354 |
140
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355 yield Markup(''.join(buf)) |
1 | 356 |
141
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357 if tagname in noescape_elems: |
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358 noescape = True |
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359 |
69 | 360 elif kind is END: |
1 | 361 tag = data |
136 | 362 if not tag.namespace or tag in namespace: |
363 yield Markup('</%s>' % tag.localname) | |
1 | 364 |
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365 noescape = False |
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366 |
69 | 367 elif kind is TEXT: |
141
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368 if noescape: |
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369 yield data |
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370 else: |
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371 yield escape(data, quotes=False) |
1 | 372 |
89
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373 elif kind is COMMENT: |
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374 yield Markup('<!--%s-->' % data) |
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375 |
136 | 376 elif kind is DOCTYPE and not have_doctype: |
377 name, pubid, sysid = data | |
378 buf = ['<!DOCTYPE %s'] | |
379 if pubid: | |
380 buf += [' PUBLIC "%s"'] | |
381 elif sysid: | |
382 buf += [' SYSTEM'] | |
383 if sysid: | |
384 buf += [' "%s"'] | |
385 buf += ['>\n'] | |
386 yield Markup(''.join(buf), *filter(None, data)) | |
387 have_doctype = True | |
109
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388 |
136 | 389 elif kind is START_NS and data[1] not in ns_mapping: |
390 ns_mapping[data[1]] = data[0] | |
109
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391 |
105
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392 elif kind is PI: |
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393 yield Markup('<?%s %s?>' % data) |
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394 |
1 | 395 |
200
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396 class TextSerializer(object): |
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397 """Produces plain text from an event stream. |
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398 |
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399 Only text events are included in the output. Unlike the other serializer, |
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400 special XML characters are not escaped: |
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401 |
230 | 402 >>> from genshi.builder import tag |
200
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403 >>> elem = tag.div(tag.a('<Hello!>', href='foo'), tag.br) |
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404 >>> print elem |
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405 <div><a href="foo"><Hello!></a><br/></div> |
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406 >>> print ''.join(TextSerializer()(elem.generate())) |
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407 <Hello!> |
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408 |
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409 If text events contain literal markup (instances of the `Markup` class), |
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410 tags or entities are stripped from the output: |
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411 |
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412 >>> elem = tag.div(Markup('<a href="foo">Hello!</a><br/>')) |
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413 >>> print elem |
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414 <div><a href="foo">Hello!</a><br/></div> |
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415 >>> print ''.join(TextSerializer()(elem.generate())) |
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416 Hello! |
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417 """ |
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418 |
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419 def __call__(self, stream): |
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420 for kind, data, pos in stream: |
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421 if kind is TEXT: |
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422 if type(data) is Markup: |
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423 data = data.striptags().stripentities() |
201
c5e0a1c86173
The `TextSerializer` should produce `unicode` objects, not `Markup` objects.
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424 yield unicode(data) |
200
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425 |
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426 |
212
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427 class EmptyTagFilter(object): |
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428 """Combines `START` and `STOP` events into `EMPTY` events for elements that |
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Refactored the handling of empty tags in the serializer: use an `EmptyTagFilter` that combines adjacent start/end events, instead of the generic pushback-iterator.
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429 have no contents. |
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430 """ |
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431 |
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432 EMPTY = StreamEventKind('EMPTY') |
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433 |
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434 def __call__(self, stream): |
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435 prev = (None, None, None) |
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436 for kind, data, pos in stream: |
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437 if prev[0] is START: |
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438 if kind is END: |
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439 prev = EMPTY, prev[1], prev[2] |
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440 yield prev |
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441 continue |
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442 else: |
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443 yield prev |
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Refactored the handling of empty tags in the serializer: use an `EmptyTagFilter` that combines adjacent start/end events, instead of the generic pushback-iterator.
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444 if kind is not START: |
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445 yield kind, data, pos |
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446 prev = kind, data, pos |
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Refactored the handling of empty tags in the serializer: use an `EmptyTagFilter` that combines adjacent start/end events, instead of the generic pushback-iterator.
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447 |
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Refactored the handling of empty tags in the serializer: use an `EmptyTagFilter` that combines adjacent start/end events, instead of the generic pushback-iterator.
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448 |
0141f45c18e1
Refactored the handling of empty tags in the serializer: use an `EmptyTagFilter` that combines adjacent start/end events, instead of the generic pushback-iterator.
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449 EMPTY = EmptyTagFilter.EMPTY |
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450 |
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451 |
123
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452 class WhitespaceFilter(object): |
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453 """A filter that removes extraneous ignorable white space from the |
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454 stream.""" |
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455 |
305 | 456 def __init__(self, preserve=None, noescape=None): |
123
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457 """Initialize the filter. |
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458 |
141
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459 @param preserve: a set or sequence of tag names for which white-space |
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460 should be ignored. |
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461 @param noescape: a set or sequence of tag names for which text content |
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462 should not be escaped |
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463 |
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464 Both the `preserve` and `noescape` sets are expected to refer to |
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465 elements that cannot contain further child elements. |
123
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466 """ |
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467 if preserve is None: |
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468 preserve = [] |
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469 self.preserve = frozenset(preserve) |
141
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470 if noescape is None: |
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471 noescape = [] |
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472 self.noescape = frozenset(noescape) |
123
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473 |
219 | 474 def __call__(self, stream, ctxt=None, space=XML_NAMESPACE['space'], |
475 trim_trailing_space=re.compile('[ \t]+(?=\n)').sub, | |
476 collapse_lines=re.compile('\n{2,}').sub): | |
123
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477 mjoin = Markup('').join |
141
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478 preserve_elems = self.preserve |
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479 preserve = False |
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480 noescape_elems = self.noescape |
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481 noescape = False |
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482 |
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483 textbuf = [] |
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484 push_text = textbuf.append |
136 | 485 pop_text = textbuf.pop |
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486 for kind, data, pos in chain(stream, [(None, None, None)]): |
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487 if kind is TEXT: |
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488 if noescape: |
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489 data = Markup(data) |
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490 push_text(data) |
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491 else: |
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492 if textbuf: |
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493 if len(textbuf) > 1: |
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494 text = mjoin(textbuf, escape_quotes=False) |
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495 del textbuf[:] |
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496 else: |
136 | 497 text = escape(pop_text(), quotes=False) |
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498 if not preserve: |
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499 text = collapse_lines('\n', trim_trailing_space('', text)) |
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500 yield TEXT, Markup(text), pos |
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501 |
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502 if kind is START: |
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503 tag, attrib = data |
219 | 504 if not preserve and (tag in preserve_elems or |
505 attrib.get(space) == 'preserve'): | |
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506 preserve = True |
219 | 507 if not noescape and tag in noescape_elems: |
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508 noescape = True |
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509 |
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510 elif kind is END: |
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511 preserve = noescape = False |
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512 |
305 | 513 elif kind is START_CDATA: |
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514 noescape = True |
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515 |
305 | 516 elif kind is END_CDATA: |
143
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517 noescape = False |
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518 |
136 | 519 if kind: |
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520 yield kind, data, pos |