Mercurial > genshi > mirror
annotate genshi/output.py @ 524:7553760b58af trunk
Add special handling for `xml:lang` to HTML/XHTML serialization.
author | cmlenz |
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date | Mon, 18 Jun 2007 11:22:24 +0000 |
parents | 942d73ba938c |
children | 5df08e5195b8 acf7c5ee36e7 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
408 | 3 # Copyright (C) 2006-2007 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 | |
123
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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 |
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25 from genshi.core import escape, Attrs, Markup, Namespace, QName, StreamEventKind |
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26 from genshi.core import START, END, TEXT, XML_DECL, DOCTYPE, START_NS, END_NS, \ |
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27 START_CDATA, END_CDATA, PI, COMMENT, XML_NAMESPACE |
1 | 28 |
462 | 29 __all__ = ['encode', 'get_serializer', 'DocType', 'XMLSerializer', |
30 'XHTMLSerializer', 'HTMLSerializer', 'TextSerializer'] | |
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31 __docformat__ = 'restructuredtext en' |
1 | 32 |
462 | 33 def encode(iterator, method='xml', encoding='utf-8'): |
34 """Encode serializer output into a string. | |
35 | |
36 :param iterator: the iterator returned from serializing a stream (basically | |
37 any iterator that yields unicode objects) | |
38 :param method: the serialization method; determines how characters not | |
39 representable in the specified encoding are treated | |
40 :param encoding: how the output string should be encoded; if set to `None`, | |
41 this method returns a `unicode` object | |
42 :return: a string or unicode object (depending on the `encoding` parameter) | |
43 :since: version 0.4.1 | |
44 """ | |
45 output = u''.join(list(iterator)) | |
46 if encoding is not None: | |
47 errors = 'replace' | |
48 if method != 'text' and not isinstance(method, TextSerializer): | |
49 errors = 'xmlcharrefreplace' | |
50 return output.encode(encoding, errors) | |
51 return output | |
52 | |
53 def get_serializer(method='xml', **kwargs): | |
54 """Return a serializer object for the given method. | |
55 | |
56 :param method: the serialization method; can be either "xml", "xhtml", | |
57 "html", "text", or a custom serializer class | |
58 | |
59 Any additional keyword arguments are passed to the serializer, and thus | |
60 depend on the `method` parameter value. | |
61 | |
62 :see: `XMLSerializer`, `XHTMLSerializer`, `HTMLSerializer`, `TextSerializer` | |
63 :since: version 0.4.1 | |
64 """ | |
65 if isinstance(method, basestring): | |
66 method = {'xml': XMLSerializer, | |
67 'xhtml': XHTMLSerializer, | |
68 'html': HTMLSerializer, | |
69 'text': TextSerializer}[method.lower()] | |
70 return method(**kwargs) | |
71 | |
1 | 72 |
85 | 73 class DocType(object): |
74 """Defines a number of commonly used DOCTYPE declarations as constants.""" | |
75 | |
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76 HTML_STRICT = ( |
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77 'html', '-//W3C//DTD HTML 4.01//EN', |
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78 'http://www.w3.org/TR/html4/strict.dtd' |
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79 ) |
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80 HTML_TRANSITIONAL = ( |
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81 'html', '-//W3C//DTD HTML 4.01 Transitional//EN', |
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82 'http://www.w3.org/TR/html4/loose.dtd' |
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83 ) |
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84 HTML_FRAMESET = ( |
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85 'html', '-//W3C//DTD HTML 4.01 Frameset//EN', |
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86 'http://www.w3.org/TR/html4/frameset.dtd' |
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87 ) |
85 | 88 HTML = HTML_STRICT |
89 | |
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90 HTML5 = ('html', None, None) |
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91 |
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92 XHTML_STRICT = ( |
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93 'html', '-//W3C//DTD XHTML 1.0 Strict//EN', |
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94 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd' |
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95 ) |
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96 XHTML_TRANSITIONAL = ( |
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97 'html', '-//W3C//DTD XHTML 1.0 Transitional//EN', |
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98 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd' |
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99 ) |
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100 XHTML_FRAMESET = ( |
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101 'html', '-//W3C//DTD XHTML 1.0 Frameset//EN', |
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102 'http://www.w3.org/TR/xhtml1/DTD/xhtml1-frameset.dtd' |
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103 ) |
85 | 104 XHTML = XHTML_STRICT |
105 | |
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106 def get(cls, name): |
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107 """Return the ``(name, pubid, sysid)`` tuple of the ``DOCTYPE`` |
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108 declaration for the specified name. |
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109 |
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110 The following names are recognized in this version: |
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111 * "html" or "html-strict" for the HTML 4.01 strict DTD |
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112 * "html-transitional" for the HTML 4.01 transitional DTD |
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113 * "html-transitional" for the HTML 4.01 frameset DTD |
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114 * "html5" for the ``DOCTYPE`` proposed for HTML5 |
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115 * "xhtml" or "xhtml-strict" for the XHTML 1.0 strict DTD |
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116 * "xhtml-transitional" for the XHTML 1.0 transitional DTD |
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117 * "xhtml-frameset" for the XHTML 1.0 frameset DTD |
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118 |
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119 :param name: the name of the ``DOCTYPE`` |
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120 :return: the ``(name, pubid, sysid)`` tuple for the requested |
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121 ``DOCTYPE``, or ``None`` if the name is not recognized |
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122 :since: version 0.4.1 |
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123 """ |
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124 return { |
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125 'html': cls.HTML, 'html-strict': cls.HTML_STRICT, |
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126 'html-transitional': DocType.HTML_TRANSITIONAL, |
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127 'html-frameset': DocType.HTML_FRAMESET, |
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128 'html5': cls.HTML5, |
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129 'xhtml': cls.XHTML, 'xhtml-strict': cls.XHTML_STRICT, |
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130 'xhtml-transitional': cls.XHTML_TRANSITIONAL, |
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131 'xhtml-frameset': cls.XHTML_FRAMESET, |
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132 }.get(name.lower()) |
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133 get = classmethod(get) |
448 | 134 |
85 | 135 |
123
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136 class XMLSerializer(object): |
1 | 137 """Produces XML text from an event stream. |
138 | |
230 | 139 >>> from genshi.builder import tag |
20 | 140 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
123
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141 >>> print ''.join(XMLSerializer()(elem.generate())) |
1 | 142 <div><a href="foo"/><br/><hr noshade="True"/></div> |
143 """ | |
123
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144 |
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145 _PRESERVE_SPACE = frozenset() |
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146 |
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147 def __init__(self, doctype=None, strip_whitespace=True, |
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148 namespace_prefixes=None): |
85 | 149 """Initialize the XML serializer. |
150 | |
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151 :param doctype: a ``(name, pubid, sysid)`` tuple that represents the |
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152 DOCTYPE declaration that should be included at the top |
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153 of the generated output, or the name of a DOCTYPE as |
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154 defined in `DocType.get` |
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155 :param strip_whitespace: whether extraneous whitespace should be |
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156 stripped from the output |
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157 :note: Changed in 0.4.2: The `doctype` parameter can now be a string. |
85 | 158 """ |
159 self.preamble = [] | |
160 if doctype: | |
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161 if isinstance(doctype, basestring): |
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162 doctype = DocType.get(doctype) |
85 | 163 self.preamble.append((DOCTYPE, doctype, (None, -1, -1))) |
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164 self.filters = [EmptyTagFilter()] |
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165 if strip_whitespace: |
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166 self.filters.append(WhitespaceFilter(self._PRESERVE_SPACE)) |
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167 self.filters.append(NamespaceFlattener(prefixes=namespace_prefixes)) |
1 | 168 |
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169 def __call__(self, stream): |
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170 have_decl = have_doctype = False |
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171 in_cdata = False |
1 | 172 |
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173 stream = chain(self.preamble, stream) |
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174 for filter_ in self.filters: |
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175 stream = filter_(stream) |
1 | 176 for kind, data, pos in stream: |
177 | |
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178 if kind is START or kind is EMPTY: |
1 | 179 tag, attrib = data |
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180 buf = ['<', tag] |
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181 for attr, value in attrib: |
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182 buf += [' ', attr, '="', escape(value), '"'] |
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183 buf.append(kind is EMPTY and '/>' or '>') |
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184 yield Markup(u''.join(buf)) |
1 | 185 |
69 | 186 elif kind is END: |
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187 yield Markup('</%s>' % data) |
1 | 188 |
69 | 189 elif kind is TEXT: |
143
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190 if in_cdata: |
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191 yield data |
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192 else: |
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193 yield escape(data, quotes=False) |
1 | 194 |
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195 elif kind is COMMENT: |
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196 yield Markup('<!--%s-->' % data) |
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197 |
460
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198 elif kind is XML_DECL and not have_decl: |
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199 version, encoding, standalone = data |
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200 buf = ['<?xml version="%s"' % version] |
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201 if encoding: |
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202 buf.append(' encoding="%s"' % encoding) |
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203 if standalone != -1: |
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204 standalone = standalone and 'yes' or 'no' |
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205 buf.append(' standalone="%s"' % standalone) |
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206 buf.append('?>\n') |
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207 yield Markup(u''.join(buf)) |
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208 have_decl = True |
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209 |
136 | 210 elif kind is DOCTYPE and not have_doctype: |
211 name, pubid, sysid = data | |
212 buf = ['<!DOCTYPE %s'] | |
213 if pubid: | |
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214 buf.append(' PUBLIC "%s"') |
136 | 215 elif sysid: |
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216 buf.append(' SYSTEM') |
136 | 217 if sysid: |
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218 buf.append(' "%s"') |
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219 buf.append('>\n') |
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220 yield Markup(u''.join(buf), *filter(None, data)) |
136 | 221 have_doctype = True |
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222 |
143
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223 elif kind is START_CDATA: |
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224 yield Markup('<![CDATA[') |
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225 in_cdata = True |
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226 |
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227 elif kind is END_CDATA: |
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228 yield Markup(']]>') |
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229 in_cdata = False |
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230 |
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231 elif kind is PI: |
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232 yield Markup('<?%s %s?>' % data) |
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233 |
1 | 234 |
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235 class XHTMLSerializer(XMLSerializer): |
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236 """Produces XHTML text from an event stream. |
1 | 237 |
230 | 238 >>> from genshi.builder import tag |
20 | 239 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
123
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240 >>> print ''.join(XHTMLSerializer()(elem.generate())) |
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241 <div><a href="foo"></a><br /><hr noshade="noshade" /></div> |
1 | 242 """ |
243 | |
244 _EMPTY_ELEMS = frozenset(['area', 'base', 'basefont', 'br', 'col', 'frame', | |
245 'hr', 'img', 'input', 'isindex', 'link', 'meta', | |
246 'param']) | |
247 _BOOLEAN_ATTRS = frozenset(['selected', 'checked', 'compact', 'declare', | |
248 'defer', 'disabled', 'ismap', 'multiple', | |
249 'nohref', 'noresize', 'noshade', 'nowrap']) | |
346
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250 _PRESERVE_SPACE = frozenset([ |
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251 QName('pre'), QName('http://www.w3.org/1999/xhtml}pre'), |
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252 QName('textarea'), QName('http://www.w3.org/1999/xhtml}textarea') |
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253 ]) |
1 | 254 |
410
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255 def __init__(self, doctype=None, strip_whitespace=True, |
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256 namespace_prefixes=None): |
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257 super(XHTMLSerializer, self).__init__(doctype, False) |
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258 self.filters = [EmptyTagFilter()] |
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259 if strip_whitespace: |
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260 self.filters.append(WhitespaceFilter(self._PRESERVE_SPACE)) |
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261 namespace_prefixes = namespace_prefixes or {} |
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262 namespace_prefixes['http://www.w3.org/1999/xhtml'] = '' |
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263 self.filters.append(NamespaceFlattener(prefixes=namespace_prefixes)) |
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264 |
123
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265 def __call__(self, stream): |
136 | 266 boolean_attrs = self._BOOLEAN_ATTRS |
267 empty_elems = self._EMPTY_ELEMS | |
85 | 268 have_doctype = False |
143
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269 in_cdata = False |
1 | 270 |
123
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271 stream = chain(self.preamble, stream) |
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272 for filter_ in self.filters: |
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273 stream = filter_(stream) |
1 | 274 for kind, data, pos in stream: |
275 | |
212
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276 if kind is START or kind is EMPTY: |
1 | 277 tag, attrib = data |
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278 buf = ['<', tag] |
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279 for attr, value in attrib: |
410
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280 if attr in boolean_attrs: |
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281 value = attr |
524
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282 elif attr == u'xml:lang' and u'lang' not in attrib: |
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283 buf += [' lang="', escape(value), '"'] |
410
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284 buf += [' ', attr, '="', escape(value), '"'] |
212
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285 if kind is EMPTY: |
410
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286 if tag in empty_elems: |
397
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287 buf.append(' />') |
96
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288 else: |
410
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289 buf.append('></%s>' % tag) |
141
520a5b7dd6d2
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290 else: |
397
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291 buf.append('>') |
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292 yield Markup(u''.join(buf)) |
96
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293 |
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294 elif kind is END: |
410
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295 yield Markup('</%s>' % data) |
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296 |
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297 elif kind is TEXT: |
143
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298 if in_cdata: |
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299 yield data |
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300 else: |
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301 yield escape(data, quotes=False) |
96
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302 |
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303 elif kind is COMMENT: |
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304 yield Markup('<!--%s-->' % data) |
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305 |
136 | 306 elif kind is DOCTYPE and not have_doctype: |
307 name, pubid, sysid = data | |
308 buf = ['<!DOCTYPE %s'] | |
309 if pubid: | |
397
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310 buf.append(' PUBLIC "%s"') |
136 | 311 elif sysid: |
397
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312 buf.append(' SYSTEM') |
136 | 313 if sysid: |
397
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314 buf.append(' "%s"') |
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315 buf.append('>\n') |
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316 yield Markup(u''.join(buf), *filter(None, data)) |
136 | 317 have_doctype = True |
109
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318 |
143
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319 elif kind is START_CDATA: |
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320 yield Markup('<![CDATA[') |
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321 in_cdata = True |
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322 |
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323 elif kind is END_CDATA: |
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324 yield Markup(']]>') |
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325 in_cdata = False |
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326 |
105
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327 elif kind is PI: |
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328 yield Markup('<?%s %s?>' % data) |
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329 |
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330 |
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331 class HTMLSerializer(XHTMLSerializer): |
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332 """Produces HTML text from an event stream. |
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333 |
230 | 334 >>> from genshi.builder import tag |
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335 >>> elem = tag.div(tag.a(href='foo'), tag.br, tag.hr(noshade=True)) |
123
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336 >>> print ''.join(HTMLSerializer()(elem.generate())) |
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337 <div><a href="foo"></a><br><hr noshade></div> |
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338 """ |
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339 |
410
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340 _NOESCAPE_ELEMS = frozenset([ |
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341 QName('script'), QName('http://www.w3.org/1999/xhtml}script'), |
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342 QName('style'), QName('http://www.w3.org/1999/xhtml}style') |
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343 ]) |
141
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344 |
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345 def __init__(self, doctype=None, strip_whitespace=True): |
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346 """Initialize the HTML serializer. |
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347 |
425
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348 :param doctype: a ``(name, pubid, sysid)`` tuple that represents the |
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349 DOCTYPE declaration that should be included at the top |
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350 of the generated output |
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351 :param strip_whitespace: whether extraneous whitespace should be |
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352 stripped from the output |
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353 """ |
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354 super(HTMLSerializer, self).__init__(doctype, False) |
410
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355 self.filters = [EmptyTagFilter()] |
141
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356 if strip_whitespace: |
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357 self.filters.append(WhitespaceFilter(self._PRESERVE_SPACE, |
305 | 358 self._NOESCAPE_ELEMS)) |
524
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359 self.filters.append(NamespaceFlattener(prefixes={ |
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360 'http://www.w3.org/1999/xhtml': '' |
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361 })) |
141
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362 |
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363 def __call__(self, stream): |
136 | 364 boolean_attrs = self._BOOLEAN_ATTRS |
365 empty_elems = self._EMPTY_ELEMS | |
141
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366 noescape_elems = self._NOESCAPE_ELEMS |
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367 have_doctype = False |
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368 noescape = False |
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369 |
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370 stream = chain(self.preamble, stream) |
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371 for filter_ in self.filters: |
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372 stream = filter_(stream) |
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373 for kind, data, pos in stream: |
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374 |
212
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375 if kind is START or kind is EMPTY: |
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376 tag, attrib = data |
410
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377 buf = ['<', tag] |
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378 for attr, value in attrib: |
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379 if attr in boolean_attrs: |
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380 if value: |
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381 buf += [' ', attr] |
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382 elif ':' in attr: |
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383 if attr == 'xml:lang' and u'lang' not in attrib: |
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384 buf += [' lang="', escape(value), '"'] |
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385 elif attr != 'xmlns': |
410
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386 buf += [' ', attr, '="', escape(value), '"'] |
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387 buf.append('>') |
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388 if kind is EMPTY: |
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389 if tag not in empty_elems: |
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390 buf.append('</%s>' % tag) |
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391 yield Markup(u''.join(buf)) |
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392 if tag in noescape_elems: |
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393 noescape = True |
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394 |
69 | 395 elif kind is END: |
410
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396 yield Markup('</%s>' % data) |
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397 noescape = False |
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398 |
69 | 399 elif kind is TEXT: |
141
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400 if noescape: |
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401 yield data |
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402 else: |
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403 yield escape(data, quotes=False) |
1 | 404 |
89
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405 elif kind is COMMENT: |
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406 yield Markup('<!--%s-->' % data) |
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407 |
136 | 408 elif kind is DOCTYPE and not have_doctype: |
409 name, pubid, sysid = data | |
410 buf = ['<!DOCTYPE %s'] | |
411 if pubid: | |
397
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412 buf.append(' PUBLIC "%s"') |
136 | 413 elif sysid: |
397
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414 buf.append(' SYSTEM') |
136 | 415 if sysid: |
397
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416 buf.append(' "%s"') |
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417 buf.append('>\n') |
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418 yield Markup(u''.join(buf), *filter(None, data)) |
136 | 419 have_doctype = True |
109
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420 |
105
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421 elif kind is PI: |
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422 yield Markup('<?%s %s?>' % data) |
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423 |
1 | 424 |
200
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425 class TextSerializer(object): |
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426 """Produces plain text from an event stream. |
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427 |
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428 Only text events are included in the output. Unlike the other serializer, |
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429 special XML characters are not escaped: |
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430 |
230 | 431 >>> from genshi.builder import tag |
200
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432 >>> elem = tag.div(tag.a('<Hello!>', href='foo'), tag.br) |
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433 >>> print elem |
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434 <div><a href="foo"><Hello!></a><br/></div> |
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435 >>> print ''.join(TextSerializer()(elem.generate())) |
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436 <Hello!> |
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437 |
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438 If text events contain literal markup (instances of the `Markup` class), |
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439 tags or entities are stripped from the output: |
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440 |
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441 >>> elem = tag.div(Markup('<a href="foo">Hello!</a><br/>')) |
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442 >>> print elem |
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443 <div><a href="foo">Hello!</a><br/></div> |
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444 >>> print ''.join(TextSerializer()(elem.generate())) |
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445 Hello! |
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446 """ |
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447 |
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448 def __call__(self, stream): |
410
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449 for event in stream: |
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450 if event[0] is TEXT: |
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451 data = event[1] |
200
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452 if type(data) is Markup: |
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453 data = data.striptags().stripentities() |
201
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The `TextSerializer` should produce `unicode` objects, not `Markup` objects.
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diff
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|
454 yield unicode(data) |
200
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455 |
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456 |
212
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457 class EmptyTagFilter(object): |
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458 """Combines `START` and `STOP` events into `EMPTY` events for elements that |
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459 have no contents. |
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460 """ |
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461 |
0141f45c18e1
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diff
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|
462 EMPTY = StreamEventKind('EMPTY') |
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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463 |
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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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464 def __call__(self, stream): |
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.
cmlenz
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465 prev = (None, None, None) |
410
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diff
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466 for ev in stream: |
212
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.
cmlenz
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467 if prev[0] is START: |
410
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diff
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468 if ev[0] is END: |
212
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.
cmlenz
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469 prev = EMPTY, prev[1], prev[2] |
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.
cmlenz
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|
470 yield prev |
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.
cmlenz
parents:
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diff
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|
471 continue |
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.
cmlenz
parents:
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472 else: |
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.
cmlenz
parents:
201
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changeset
|
473 yield prev |
410
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|
474 if ev[0] is not START: |
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475 yield ev |
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476 prev = ev |
212
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.
cmlenz
parents:
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|
477 |
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.
cmlenz
parents:
201
diff
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478 |
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.
cmlenz
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479 EMPTY = EmptyTagFilter.EMPTY |
0141f45c18e1
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cmlenz
parents:
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480 |
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.
cmlenz
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changeset
|
481 |
410
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482 class NamespaceFlattener(object): |
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483 r"""Output stream filter that removes namespace information from the stream, |
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484 instead adding namespace attributes and prefixes as needed. |
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|
485 |
425
073640758a42
Try to use proper reStructuredText for docstrings throughout.
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486 :param prefixes: optional mapping of namespace URIs to prefixes |
410
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487 |
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488 >>> from genshi.input import XML |
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489 >>> xml = XML('''<doc xmlns="NS1" xmlns:two="NS2"> |
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490 ... <two:item/> |
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491 ... </doc>''') |
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492 >>> for kind, data, pos in NamespaceFlattener()(xml): |
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493 ... print kind, repr(data) |
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494 START (u'doc', Attrs([(u'xmlns', u'NS1'), (u'xmlns:two', u'NS2')])) |
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|
495 TEXT u'\n ' |
d14d89995c29
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496 START (u'two:item', Attrs()) |
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diff
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497 END u'two:item' |
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|
498 TEXT u'\n' |
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|
499 END u'doc' |
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|
500 """ |
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|
501 |
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|
502 def __init__(self, prefixes=None): |
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503 self.prefixes = {XML_NAMESPACE.uri: 'xml'} |
d14d89995c29
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|
504 if prefixes is not None: |
d14d89995c29
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|
505 self.prefixes.update(prefixes) |
d14d89995c29
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diff
changeset
|
506 |
d14d89995c29
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|
507 def __call__(self, stream): |
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508 prefixes = dict([(v, [k]) for k, v in self.prefixes.items()]) |
d14d89995c29
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diff
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|
509 namespaces = {XML_NAMESPACE.uri: ['xml']} |
d14d89995c29
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diff
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|
510 def _push_ns(prefix, uri): |
d14d89995c29
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diff
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|
511 namespaces.setdefault(uri, []).append(prefix) |
d14d89995c29
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changeset
|
512 prefixes.setdefault(prefix, []).append(uri) |
d14d89995c29
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diff
changeset
|
513 |
d14d89995c29
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|
514 ns_attrs = [] |
d14d89995c29
Improve the handling of namespaces in serialization.
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diff
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|
515 _push_ns_attr = ns_attrs.append |
437 | 516 def _make_ns_attr(prefix, uri): |
517 return u'xmlns%s' % (prefix and ':%s' % prefix or ''), uri | |
410
d14d89995c29
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|
518 |
d14d89995c29
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cmlenz
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|
519 def _gen_prefix(): |
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|
520 val = 0 |
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|
521 while 1: |
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diff
changeset
|
522 val += 1 |
d14d89995c29
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|
523 yield 'ns%d' % val |
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|
524 _gen_prefix = _gen_prefix().next |
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diff
changeset
|
525 |
d14d89995c29
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diff
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|
526 for kind, data, pos in stream: |
d14d89995c29
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diff
changeset
|
527 |
d14d89995c29
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diff
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|
528 if kind is START or kind is EMPTY: |
d14d89995c29
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diff
changeset
|
529 tag, attrs = data |
d14d89995c29
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changeset
|
530 |
d14d89995c29
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diff
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|
531 tagname = tag.localname |
d14d89995c29
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diff
changeset
|
532 tagns = tag.namespace |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
533 if tagns: |
d14d89995c29
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cmlenz
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408
diff
changeset
|
534 if tagns in namespaces: |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
535 prefix = namespaces[tagns][-1] |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
536 if prefix: |
d14d89995c29
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parents:
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diff
changeset
|
537 tagname = u'%s:%s' % (prefix, tagname) |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
538 else: |
d14d89995c29
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diff
changeset
|
539 _push_ns_attr((u'xmlns', tagns)) |
d14d89995c29
Improve the handling of namespaces in serialization.
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parents:
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diff
changeset
|
540 _push_ns('', tagns) |
d14d89995c29
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parents:
408
diff
changeset
|
541 |
d14d89995c29
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diff
changeset
|
542 new_attrs = [] |
d14d89995c29
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diff
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|
543 for attr, value in attrs: |
d14d89995c29
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diff
changeset
|
544 attrname = attr.localname |
d14d89995c29
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diff
changeset
|
545 attrns = attr.namespace |
d14d89995c29
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parents:
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diff
changeset
|
546 if attrns: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
547 if attrns not in namespaces: |
d14d89995c29
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parents:
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diff
changeset
|
548 prefix = _gen_prefix() |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
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diff
changeset
|
549 _push_ns(prefix, attrns) |
412
bd51adc20a67
Actually write xmlns declaratons for generated attribute namespace prefixes.
cmlenz
parents:
410
diff
changeset
|
550 _push_ns_attr(('xmlns:%s' % prefix, attrns)) |
410
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
551 else: |
d14d89995c29
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parents:
408
diff
changeset
|
552 prefix = namespaces[attrns][-1] |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
553 if prefix: |
d14d89995c29
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parents:
408
diff
changeset
|
554 attrname = u'%s:%s' % (prefix, attrname) |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
555 new_attrs.append((attrname, value)) |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
556 |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
557 yield kind, (tagname, Attrs(ns_attrs + new_attrs)), pos |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
558 del ns_attrs[:] |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
559 |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
560 elif kind is END: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
561 tagname = data.localname |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
562 tagns = data.namespace |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
563 if tagns: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
564 prefix = namespaces[tagns][-1] |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
565 if prefix: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
566 tagname = u'%s:%s' % (prefix, tagname) |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
567 yield kind, tagname, pos |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
568 |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
569 elif kind is START_NS: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
570 prefix, uri = data |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
571 if uri not in namespaces: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
572 prefix = prefixes.get(uri, [prefix])[-1] |
437 | 573 _push_ns_attr(_make_ns_attr(prefix, uri)) |
410
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
574 _push_ns(prefix, uri) |
d14d89995c29
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cmlenz
parents:
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diff
changeset
|
575 |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
576 elif kind is END_NS: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
577 if data in prefixes: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
578 uris = prefixes.get(data) |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
579 uri = uris.pop() |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
580 if not uris: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
581 del prefixes[data] |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
582 if uri not in uris or uri != uris[-1]: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
583 uri_prefixes = namespaces[uri] |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
584 uri_prefixes.pop() |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
585 if not uri_prefixes: |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
586 del namespaces[uri] |
437 | 587 if ns_attrs: |
588 attr = _make_ns_attr(data, uri) | |
589 if attr in ns_attrs: | |
590 ns_attrs.remove(attr) | |
410
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
591 |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
592 else: |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
593 yield kind, data, pos |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
594 |
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
595 |
123
10279d2eeec9
Fix for #18: whitespace in space-sensitive elements such as `<pre>` and `<textarea>` is now preserved.
cmlenz
parents:
109
diff
changeset
|
596 class WhitespaceFilter(object): |
10279d2eeec9
Fix for #18: whitespace in space-sensitive elements such as `<pre>` and `<textarea>` is now preserved.
cmlenz
parents:
109
diff
changeset
|
597 """A filter that removes extraneous ignorable white space from the |
410
d14d89995c29
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cmlenz
parents:
408
diff
changeset
|
598 stream. |
d14d89995c29
Improve the handling of namespaces in serialization.
cmlenz
parents:
408
diff
changeset
|
599 """ |
123
10279d2eeec9
Fix for #18: whitespace in space-sensitive elements such as `<pre>` and `<textarea>` is now preserved.
cmlenz
parents:
109
diff
changeset
|
600 |
305 | 601 def __init__(self, preserve=None, noescape=None): |
123
10279d2eeec9
Fix for #18: whitespace in space-sensitive elements such as `<pre>` and `<textarea>` is now preserved.
cmlenz
parents:
109
diff
changeset
|
602 """Initialize the filter. |
10279d2eeec9
Fix for #18: whitespace in space-sensitive elements such as `<pre>` and `<textarea>` is now preserved.
cmlenz
parents:
109
diff
changeset
|
603 |
425
073640758a42
Try to use proper reStructuredText for docstrings throughout.
cmlenz
parents:
412
diff
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604 :param preserve: a set or sequence of tag names for which white-space |
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605 should be preserved |
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606 :param noescape: a set or sequence of tag names for which text content |
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607 should not be escaped |
141
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608 |
346
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609 The `noescape` set is expected to refer to elements that cannot contain |
425
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610 further child elements (such as ``<style>`` or ``<script>`` in HTML |
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611 documents). |
123
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612 """ |
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613 if preserve is None: |
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614 preserve = [] |
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615 self.preserve = frozenset(preserve) |
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616 if noescape is None: |
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617 noescape = [] |
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618 self.noescape = frozenset(noescape) |
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619 |
219 | 620 def __call__(self, stream, ctxt=None, space=XML_NAMESPACE['space'], |
621 trim_trailing_space=re.compile('[ \t]+(?=\n)').sub, | |
622 collapse_lines=re.compile('\n{2,}').sub): | |
123
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623 mjoin = Markup('').join |
141
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624 preserve_elems = self.preserve |
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625 preserve = 0 |
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626 noescape_elems = self.noescape |
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627 noescape = False |
123
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628 |
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629 textbuf = [] |
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630 push_text = textbuf.append |
136 | 631 pop_text = textbuf.pop |
123
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632 for kind, data, pos in chain(stream, [(None, None, None)]): |
410
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Improve the handling of namespaces in serialization.
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633 |
123
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634 if kind is TEXT: |
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635 if noescape: |
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636 data = Markup(data) |
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637 push_text(data) |
123
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638 else: |
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639 if textbuf: |
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640 if len(textbuf) > 1: |
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641 text = mjoin(textbuf, escape_quotes=False) |
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642 del textbuf[:] |
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643 else: |
136 | 644 text = escape(pop_text(), quotes=False) |
141
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645 if not preserve: |
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646 text = collapse_lines('\n', trim_trailing_space('', text)) |
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647 yield TEXT, Markup(text), pos |
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648 |
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649 if kind is START: |
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650 tag, attrs = data |
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651 if preserve or (tag in preserve_elems or |
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652 attrs.get(space) == 'preserve'): |
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653 preserve += 1 |
219 | 654 if not noescape and tag in noescape_elems: |
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655 noescape = True |
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656 |
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657 elif kind is END: |
346
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658 noescape = False |
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659 if preserve: |
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660 preserve -= 1 |
141
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661 |
305 | 662 elif kind is START_CDATA: |
143
3d4c214c979a
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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663 noescape = True |
3d4c214c979a
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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664 |
305 | 665 elif kind is END_CDATA: |
143
3d4c214c979a
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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666 noescape = False |
3d4c214c979a
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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667 |
136 | 668 if kind: |
123
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669 yield kind, data, pos |