Mercurial > genshi > mirror
annotate markup/core.py @ 187:3932175304db stable-0.2.x 0.2.0
Prepare [milestone:0.2] release.
author | cmlenz |
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date | Tue, 22 Aug 2006 15:28:35 +0000 |
parents | 2f30ce3fb85e |
children | 5861f4446c26 |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
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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 | |
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8 # are also available at http://markup.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 | |
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12 # history and logs, available at http://markup.edgewall.org/log/. |
1 | 13 |
14 """Core classes for markup processing.""" | |
15 | |
16 import htmlentitydefs | |
17 import re | |
18 | |
19 __all__ = ['Stream', 'Markup', 'escape', 'unescape', 'Namespace', 'QName'] | |
20 | |
21 | |
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22 class StreamEventKind(str): |
1 | 23 """A kind of event on an XML stream.""" |
24 | |
25 | |
26 class Stream(object): | |
27 """Represents a stream of markup events. | |
28 | |
29 This class is basically an iterator over the events. | |
30 | |
31 Also provided are ways to serialize the stream to text. The `serialize()` | |
32 method will return an iterator over generated strings, while `render()` | |
33 returns the complete generated text at once. Both accept various parameters | |
34 that impact the way the stream is serialized. | |
35 | |
36 Stream events are tuples of the form: | |
37 | |
38 (kind, data, position) | |
39 | |
40 where `kind` is the event kind (such as `START`, `END`, `TEXT`, etc), `data` | |
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41 depends on the kind of event, and `position` is a `(filename, line, offset)` |
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42 tuple that contains the location of the original element or text in the |
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43 input. If the original location is unknown, `position` is `(None, -1, -1)`. |
1 | 44 """ |
45 __slots__ = ['events'] | |
46 | |
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47 START = StreamEventKind('START') # a start tag |
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48 END = StreamEventKind('END') # an end tag |
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49 TEXT = StreamEventKind('TEXT') # literal text |
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50 DOCTYPE = StreamEventKind('DOCTYPE') # doctype declaration |
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51 START_NS = StreamEventKind('START_NS') # start namespace mapping |
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52 END_NS = StreamEventKind('END_NS') # end namespace mapping |
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53 START_CDATA = StreamEventKind('START_CDATA') # start CDATA section |
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54 END_CDATA = StreamEventKind('END_CDATA') # end CDATA section |
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55 PI = StreamEventKind('PI') # processing instruction |
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56 COMMENT = StreamEventKind('COMMENT') # comment |
1 | 57 |
58 def __init__(self, events): | |
59 """Initialize the stream with a sequence of markup events. | |
60 | |
27 | 61 @param events: a sequence or iterable providing the events |
1 | 62 """ |
63 self.events = events | |
64 | |
65 def __iter__(self): | |
66 return iter(self.events) | |
67 | |
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68 def filter(self, *filters): |
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69 """Apply filters to the stream. |
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70 |
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71 This method returns a new stream with the given filters applied. The |
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72 filters must be callables that accept the stream object as parameter, |
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73 and return the filtered stream. |
113
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74 """ |
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75 stream = self |
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76 for filter_ in filters: |
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77 stream = filter_(iter(stream)) |
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78 return Stream(stream) |
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79 |
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80 def render(self, method='xml', encoding='utf-8', **kwargs): |
1 | 81 """Return a string representation of the stream. |
82 | |
83 @param method: determines how the stream is serialized; can be either | |
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84 "xml", "xhtml", or "html", or a custom `Serializer` |
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85 subclass |
1 | 86 @param encoding: how the output string should be encoded; if set to |
87 `None`, this method returns a `unicode` object | |
88 | |
89 Any additional keyword arguments are passed to the serializer, and thus | |
90 depend on the `method` parameter value. | |
91 """ | |
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92 generator = self.serialize(method=method, **kwargs) |
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93 output = u''.join(list(generator)) |
1 | 94 if encoding is not None: |
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95 return output.encode(encoding, 'xmlcharrefreplace') |
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96 return output |
1 | 97 |
98 def select(self, path): | |
99 """Return a new stream that contains the events matching the given | |
100 XPath expression. | |
101 | |
102 @param path: a string containing the XPath expression | |
103 """ | |
104 from markup.path import Path | |
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105 return Path(path).select(self) |
1 | 106 |
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107 def serialize(self, method='xml', **kwargs): |
1 | 108 """Generate strings corresponding to a specific serialization of the |
109 stream. | |
110 | |
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111 Unlike the `render()` method, this method is a generator that returns |
1 | 112 the serialized output incrementally, as opposed to returning a single |
113 string. | |
114 | |
115 @param method: determines how the stream is serialized; can be either | |
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116 "xml", "xhtml", or "html", or a custom serializer class |
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117 |
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118 Any additional keyword arguments are passed to the serializer, and thus |
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119 depend on the `method` parameter value. |
1 | 120 """ |
121 from markup import output | |
122 cls = method | |
123 if isinstance(method, basestring): | |
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124 cls = {'xml': output.XMLSerializer, |
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125 'xhtml': output.XHTMLSerializer, |
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126 'html': output.HTMLSerializer}[method] |
123
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127 serialize = cls(**kwargs) |
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128 return serialize(_ensure(self)) |
1 | 129 |
130 def __str__(self): | |
131 return self.render() | |
132 | |
133 def __unicode__(self): | |
134 return self.render(encoding=None) | |
135 | |
136 | |
69 | 137 START = Stream.START |
138 END = Stream.END | |
139 TEXT = Stream.TEXT | |
140 DOCTYPE = Stream.DOCTYPE | |
141 START_NS = Stream.START_NS | |
142 END_NS = Stream.END_NS | |
143
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143 START_CDATA = Stream.START_CDATA |
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144 END_CDATA = Stream.END_CDATA |
69 | 145 PI = Stream.PI |
146 COMMENT = Stream.COMMENT | |
147 | |
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148 def _ensure(stream): |
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149 """Ensure that every item on the stream is actually a markup event.""" |
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150 for event in stream: |
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151 if type(event) is not tuple: |
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152 if hasattr(event, 'totuple'): |
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153 event = event.totuple() |
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154 else: |
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155 event = TEXT, unicode(event), (None, -1, -1) |
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156 yield event |
111
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157 |
69 | 158 |
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159 class Attrs(list): |
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160 """Sequence type that stores the attributes of an element. |
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161 |
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162 The order of the attributes is preserved, while accessing and manipulating |
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163 attributes by name is also supported. |
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164 |
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165 >>> attrs = Attrs([('href', '#'), ('title', 'Foo')]) |
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166 >>> attrs |
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167 [(u'href', '#'), (u'title', 'Foo')] |
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168 |
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169 >>> 'href' in attrs |
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170 True |
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171 >>> 'tabindex' in attrs |
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172 False |
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173 |
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174 >>> attrs.get(u'title') |
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175 'Foo' |
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176 >>> attrs.set(u'title', 'Bar') |
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177 >>> attrs |
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178 [(u'href', '#'), (u'title', 'Bar')] |
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179 >>> attrs.remove(u'title') |
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180 >>> attrs |
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181 [(u'href', '#')] |
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182 |
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183 New attributes added using the `set()` method are appended to the end of |
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184 the list: |
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185 |
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186 >>> attrs.set(u'accesskey', 'k') |
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187 >>> attrs |
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188 [(u'href', '#'), (u'accesskey', 'k')] |
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189 |
182
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190 An `Attrs` instance can also be initialized with keyword arguments. |
170
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191 |
182
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192 >>> attrs = Attrs(class_='bar', href='#', title='Foo') |
171
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193 >>> attrs.get('class') |
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194 'bar' |
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195 >>> attrs.get('href') |
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196 '#' |
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197 >>> attrs.get('title') |
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198 'Foo' |
171
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199 |
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200 Reserved words can be used by appending a trailing underscore to the name, |
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201 and any other underscore is replaced by a dash: |
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202 |
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203 >>> attrs = Attrs(class_='bar', accept_charset='utf-8') |
171
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204 >>> attrs.get('class') |
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205 'bar' |
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206 >>> attrs.get('accept-charset') |
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207 'utf-8' |
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208 |
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209 Thus this shorthand can not be used if attribute names should contain |
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210 actual underscore characters. |
18
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211 """ |
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212 __slots__ = [] |
1 | 213 |
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214 def __init__(self, attrib=None, **kwargs): |
182
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215 """Create the `Attrs` instance. |
18
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216 |
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217 If the `attrib` parameter is provided, it is expected to be a sequence |
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218 of `(name, value)` tuples. |
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219 """ |
27 | 220 if attrib is None: |
221 attrib = [] | |
222 list.__init__(self, [(QName(name), value) for name, value in attrib]) | |
170
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223 for name, value in kwargs.items(): |
171
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224 self.set(name.rstrip('_').replace('_', '-'), value) |
1 | 225 |
226 def __contains__(self, name): | |
18
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227 """Return whether the list includes an attribute with the specified |
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228 name. |
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229 """ |
133
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230 for attr, _ in self: |
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231 if attr == name: |
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232 return True |
1 | 233 |
234 def get(self, name, default=None): | |
18
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235 """Return the value of the attribute with the specified name, or the |
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236 value of the `default` parameter if no such attribute is found. |
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237 """ |
1 | 238 for attr, value in self: |
239 if attr == name: | |
240 return value | |
241 return default | |
242 | |
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243 def remove(self, name): |
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244 """Remove the attribute with the specified name. |
18
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245 |
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246 If no such attribute is found, this method does nothing. |
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247 """ |
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248 for idx, (attr, _) in enumerate(self): |
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249 if attr == name: |
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250 del self[idx] |
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251 break |
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252 |
1 | 253 def set(self, name, value): |
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254 """Set the specified attribute to the given value. |
18
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255 |
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256 If an attribute with the specified name is already in the list, the |
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257 value of the existing entry is updated. Otherwise, a new attribute is |
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258 appended to the end of the list. |
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259 """ |
1 | 260 for idx, (attr, _) in enumerate(self): |
261 if attr == name: | |
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262 self[idx] = (QName(attr), value) |
1 | 263 break |
264 else: | |
265 self.append((QName(name), value)) | |
266 | |
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267 def totuple(self): |
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268 """Return the attributes as a markup event. |
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269 |
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270 The returned event is a TEXT event, the data is the value of all |
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271 attributes joined together. |
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272 """ |
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273 return TEXT, u''.join([x[1] for x in self]), (None, -1, -1) |
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274 |
1 | 275 |
116 | 276 def plaintext(text, keeplinebreaks=True): |
277 """Returns the text as a `unicode` string with all entities and tags | |
278 removed. | |
279 """ | |
280 text = stripentities(striptags(text)) | |
281 if not keeplinebreaks: | |
282 text = text.replace(u'\n', u' ') | |
283 return text | |
284 | |
113
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285 def stripentities(text, keepxmlentities=False): |
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286 """Return a copy of the given text with any character or numeric entities |
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287 replaced by the equivalent UTF-8 characters. |
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288 |
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289 If the `keepxmlentities` parameter is provided and evaluates to `True`, |
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290 the core XML entities (&, ', >, < and ") are not |
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291 stripped. |
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292 """ |
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293 def _replace_entity(match): |
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294 if match.group(1): # numeric entity |
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295 ref = match.group(1) |
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296 if ref.startswith('x'): |
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297 ref = int(ref[1:], 16) |
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298 else: |
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299 ref = int(ref, 10) |
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300 return unichr(ref) |
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301 else: # character entity |
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302 ref = match.group(2) |
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303 if keepxmlentities and ref in ('amp', 'apos', 'gt', 'lt', |
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304 'quot'): |
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305 return '&%s;' % ref |
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306 try: |
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307 codepoint = htmlentitydefs.name2codepoint[ref] |
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308 return unichr(codepoint) |
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309 except KeyError: |
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310 if keepxmlentities: |
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311 return '&%s;' % ref |
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312 else: |
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313 return ref |
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314 return re.sub(r'&(?:#((?:\d+)|(?:[xX][0-9a-fA-F]+));?|(\w+);)', |
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315 _replace_entity, text) |
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316 |
116 | 317 def striptags(text): |
318 """Return a copy of the text with all XML/HTML tags removed.""" | |
319 return re.sub(r'<[^>]*?>', '', text) | |
320 | |
113
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321 |
1 | 322 class Markup(unicode): |
323 """Marks a string as being safe for inclusion in HTML/XML output without | |
324 needing to be escaped. | |
325 """ | |
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326 __slots__ = [] |
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327 |
27 | 328 def __new__(cls, text='', *args): |
1 | 329 if args: |
136 | 330 text %= tuple(map(escape, args)) |
27 | 331 return unicode.__new__(cls, text) |
1 | 332 |
333 def __add__(self, other): | |
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334 return Markup(unicode(self) + escape(other)) |
1 | 335 |
336 def __mod__(self, args): | |
337 if not isinstance(args, (list, tuple)): | |
338 args = [args] | |
136 | 339 return Markup(unicode.__mod__(self, tuple(map(escape, args)))) |
1 | 340 |
341 def __mul__(self, num): | |
342 return Markup(unicode(self) * num) | |
343 | |
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344 def __repr__(self): |
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345 return '<%s "%s">' % (self.__class__.__name__, self) |
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346 |
54 | 347 def join(self, seq, escape_quotes=True): |
348 return Markup(unicode(self).join([escape(item, quotes=escape_quotes) | |
34 | 349 for item in seq])) |
1 | 350 |
351 def escape(cls, text, quotes=True): | |
352 """Create a Markup instance from a string and escape special characters | |
353 it may contain (<, >, & and \"). | |
354 | |
355 If the `quotes` parameter is set to `False`, the \" character is left | |
356 as is. Escaping quotes is generally only required for strings that are | |
357 to be used in attribute values. | |
358 """ | |
73 | 359 if not text: |
360 return cls() | |
361 if type(text) is cls: | |
1 | 362 return text |
73 | 363 text = unicode(text).replace('&', '&') \ |
364 .replace('<', '<') \ | |
365 .replace('>', '>') | |
1 | 366 if quotes: |
367 text = text.replace('"', '"') | |
368 return cls(text) | |
369 escape = classmethod(escape) | |
370 | |
371 def unescape(self): | |
372 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
373 if not self: | |
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374 return u'' |
1 | 375 return unicode(self).replace('"', '"') \ |
376 .replace('>', '>') \ | |
377 .replace('<', '<') \ | |
378 .replace('&', '&') | |
379 | |
116 | 380 def stripentities(self, keepxmlentities=False): |
381 """Return a copy of the text with any character or numeric entities | |
382 replaced by the equivalent UTF-8 characters. | |
383 | |
384 If the `keepxmlentities` parameter is provided and evaluates to `True`, | |
385 the core XML entities (&, ', >, < and ") are not | |
386 stripped. | |
6 | 387 """ |
116 | 388 return Markup(stripentities(self, keepxmlentities=keepxmlentities)) |
389 | |
390 def striptags(self): | |
391 """Return a copy of the text with all XML/HTML tags removed.""" | |
392 return Markup(striptags(self)) | |
1 | 393 |
394 | |
395 escape = Markup.escape | |
396 | |
397 def unescape(text): | |
398 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
399 if not isinstance(text, Markup): | |
400 return text | |
401 return text.unescape() | |
402 | |
403 | |
404 class Namespace(object): | |
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405 """Utility class creating and testing elements with a namespace. |
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406 |
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407 Internally, namespace URIs are encoded in the `QName` of any element or |
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408 attribute, the namespace URI being enclosed in curly braces. This class |
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409 helps create and test these strings. |
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410 |
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411 A `Namespace` object is instantiated with the namespace URI. |
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412 |
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413 >>> html = Namespace('http://www.w3.org/1999/xhtml') |
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414 >>> html |
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415 <Namespace "http://www.w3.org/1999/xhtml"> |
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416 >>> html.uri |
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417 u'http://www.w3.org/1999/xhtml' |
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418 |
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419 The `Namespace` object can than be used to generate `QName` objects with |
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420 that namespace: |
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421 |
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422 >>> html.body |
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423 u'{http://www.w3.org/1999/xhtml}body' |
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424 >>> html.body.localname |
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425 u'body' |
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426 >>> html.body.namespace |
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427 u'http://www.w3.org/1999/xhtml' |
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428 |
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429 The same works using item access notation, which is useful for element or |
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430 attribute names that are not valid Python identifiers: |
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431 |
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432 >>> html['body'] |
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433 u'{http://www.w3.org/1999/xhtml}body' |
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434 |
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435 A `Namespace` object can also be used to test whether a specific `QName` |
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436 belongs to that namespace using the `in` operator: |
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437 |
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438 >>> qname = html.body |
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439 >>> qname in html |
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440 True |
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441 >>> qname in Namespace('http://www.w3.org/2002/06/xhtml2') |
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442 False |
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443 """ |
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444 def __init__(self, uri): |
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445 self.uri = unicode(uri) |
1 | 446 |
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447 def __contains__(self, qname): |
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448 return qname.namespace == self.uri |
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449 |
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450 def __eq__(self, other): |
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451 if isinstance(other, Namespace): |
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452 return self.uri == other.uri |
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453 return self.uri == other |
1 | 454 |
455 def __getitem__(self, name): | |
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456 return QName(self.uri + u'}' + name) |
1 | 457 __getattr__ = __getitem__ |
458 | |
459 def __repr__(self): | |
460 return '<Namespace "%s">' % self.uri | |
461 | |
462 def __str__(self): | |
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463 return self.uri.encode('utf-8') |
1 | 464 |
465 def __unicode__(self): | |
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466 return self.uri |
1 | 467 |
468 | |
147
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469 # The namespace used by attributes such as xml:lang and xml:space |
141
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470 XML_NAMESPACE = Namespace('http://www.w3.org/XML/1998/namespace') |
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471 |
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472 |
1 | 473 class QName(unicode): |
474 """A qualified element or attribute name. | |
475 | |
476 The unicode value of instances of this class contains the qualified name of | |
477 the element or attribute, in the form `{namespace}localname`. The namespace | |
478 URI can be obtained through the additional `namespace` attribute, while the | |
479 local name can be accessed through the `localname` attribute. | |
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480 |
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481 >>> qname = QName('foo') |
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482 >>> qname |
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483 u'foo' |
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484 >>> qname.localname |
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485 u'foo' |
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486 >>> qname.namespace |
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487 |
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488 >>> qname = QName('http://www.w3.org/1999/xhtml}body') |
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489 >>> qname |
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490 u'{http://www.w3.org/1999/xhtml}body' |
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491 >>> qname.localname |
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492 u'body' |
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493 >>> qname.namespace |
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494 u'http://www.w3.org/1999/xhtml' |
1 | 495 """ |
496 __slots__ = ['namespace', 'localname'] | |
497 | |
498 def __new__(cls, qname): | |
100 | 499 if type(qname) is cls: |
1 | 500 return qname |
501 | |
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502 parts = qname.split(u'}', 1) |
100 | 503 if len(parts) > 1: |
136 | 504 self = unicode.__new__(cls, u'{%s' % qname) |
505 self.namespace, self.localname = map(unicode, parts) | |
1 | 506 else: |
507 self = unicode.__new__(cls, qname) | |
136 | 508 self.namespace, self.localname = None, unicode(qname) |
1 | 509 return self |