Mercurial > genshi > genshi-test
annotate markup/core.py @ 73:b0fd16111f2e
Some more performance tweaks.
| author | cmlenz |
|---|---|
| date | Wed, 12 Jul 2006 18:47:39 +0000 |
| parents | e9a3930f8823 |
| children | f1aa49c759b2 |
| rev | line source |
|---|---|
| 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 from StringIO import StringIO | |
| 19 | |
| 20 __all__ = ['Stream', 'Markup', 'escape', 'unescape', 'Namespace', 'QName'] | |
| 21 | |
| 22 | |
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23 class StreamEventKind(str): |
| 1 | 24 """A kind of event on an XML stream.""" |
| 25 | |
| 26 | |
| 27 class Stream(object): | |
| 28 """Represents a stream of markup events. | |
| 29 | |
| 30 This class is basically an iterator over the events. | |
| 31 | |
| 32 Also provided are ways to serialize the stream to text. The `serialize()` | |
| 33 method will return an iterator over generated strings, while `render()` | |
| 34 returns the complete generated text at once. Both accept various parameters | |
| 35 that impact the way the stream is serialized. | |
| 36 | |
| 37 Stream events are tuples of the form: | |
| 38 | |
| 39 (kind, data, position) | |
| 40 | |
| 41 where `kind` is the event kind (such as `START`, `END`, `TEXT`, etc), `data` | |
| 42 depends on the kind of event, and `position` is a `(line, offset)` tuple | |
| 43 that contains the location of the original element or text in the input. | |
| 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 PROLOG = StreamEventKind('PROLOG') # XML prolog |
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51 DOCTYPE = StreamEventKind('DOCTYPE') # doctype declaration |
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52 START_NS = StreamEventKind('START-NS') # start namespace mapping |
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53 END_NS = StreamEventKind('END-NS') # end namespace mapping |
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54 PI = StreamEventKind('PI') # processing instruction |
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55 COMMENT = StreamEventKind('COMMENT') # comment |
| 1 | 56 |
| 57 def __init__(self, events): | |
| 58 """Initialize the stream with a sequence of markup events. | |
| 59 | |
| 27 | 60 @param events: a sequence or iterable providing the events |
| 1 | 61 """ |
| 62 self.events = events | |
| 63 | |
| 64 def __iter__(self): | |
| 65 return iter(self.events) | |
| 66 | |
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67 def render(self, method='xml', encoding='utf-8', filters=None, **kwargs): |
| 1 | 68 """Return a string representation of the stream. |
| 69 | |
| 70 @param method: determines how the stream is serialized; can be either | |
| 71 'xml' or 'html', or a custom `Serializer` subclass | |
| 72 @param encoding: how the output string should be encoded; if set to | |
| 73 `None`, this method returns a `unicode` object | |
| 74 | |
| 75 Any additional keyword arguments are passed to the serializer, and thus | |
| 76 depend on the `method` parameter value. | |
| 77 """ | |
|
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78 generator = self.serialize(method=method, filters=filters, **kwargs) |
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79 output = u''.join(list(generator)) |
| 1 | 80 if encoding is not None: |
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81 return output.encode(encoding) |
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82 return output |
| 1 | 83 |
| 84 def select(self, path): | |
| 85 """Return a new stream that contains the events matching the given | |
| 86 XPath expression. | |
| 87 | |
| 88 @param path: a string containing the XPath expression | |
| 89 """ | |
| 90 from markup.path import Path | |
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91 return Path(path).select(self) |
| 1 | 92 |
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93 def serialize(self, method='xml', filters=None, **kwargs): |
| 1 | 94 """Generate strings corresponding to a specific serialization of the |
| 95 stream. | |
| 96 | |
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97 Unlike the `render()` method, this method is a generator that returns |
| 1 | 98 the serialized output incrementally, as opposed to returning a single |
| 99 string. | |
| 100 | |
| 101 @param method: determines how the stream is serialized; can be either | |
| 102 'xml' or 'html', or a custom `Serializer` subclass | |
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103 @param filters: list of filters to apply to the stream before |
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104 serialization. The default is to apply whitespace |
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105 reduction using `markup.filters.WhitespaceFilter`. |
| 1 | 106 """ |
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107 from markup.filters import WhitespaceFilter |
| 1 | 108 from markup import output |
| 109 cls = method | |
| 110 if isinstance(method, basestring): | |
| 111 cls = {'xml': output.XMLSerializer, | |
| 112 'html': output.HTMLSerializer}[method] | |
| 113 else: | |
| 27 | 114 assert issubclass(cls, output.Serializer) |
| 1 | 115 serializer = cls(**kwargs) |
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116 |
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117 stream = self |
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118 if filters is None: |
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119 filters = [WhitespaceFilter()] |
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120 for filter_ in filters: |
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121 stream = filter_(iter(stream)) |
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122 |
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123 return serializer.serialize(stream) |
| 1 | 124 |
| 125 def __str__(self): | |
| 126 return self.render() | |
| 127 | |
| 128 def __unicode__(self): | |
| 129 return self.render(encoding=None) | |
| 130 | |
| 131 | |
| 69 | 132 START = Stream.START |
| 133 END = Stream.END | |
| 134 TEXT = Stream.TEXT | |
| 135 PROLOG = Stream.PROLOG | |
| 136 DOCTYPE = Stream.DOCTYPE | |
| 137 START_NS = Stream.START_NS | |
| 138 END_NS = Stream.END_NS | |
| 139 PI = Stream.PI | |
| 140 COMMENT = Stream.COMMENT | |
| 141 | |
| 142 | |
| 1 | 143 class Attributes(list): |
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144 """Sequence type that stores the attributes of an element. |
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145 |
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146 The order of the attributes is preserved, while accessing and manipulating |
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147 attributes by name is also supported. |
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148 |
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149 >>> attrs = Attributes([('href', '#'), ('title', 'Foo')]) |
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150 >>> attrs |
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151 [(u'href', '#'), (u'title', 'Foo')] |
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152 |
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153 >>> 'href' in attrs |
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154 True |
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155 >>> 'tabindex' in attrs |
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156 False |
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157 |
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158 >>> attrs.get(u'title') |
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159 'Foo' |
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160 >>> attrs.set(u'title', 'Bar') |
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161 >>> attrs |
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162 [(u'href', '#'), (u'title', 'Bar')] |
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163 >>> attrs.remove(u'title') |
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164 >>> attrs |
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165 [(u'href', '#')] |
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166 |
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167 New attributes added using the `set()` method are appended to the end of |
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168 the list: |
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169 |
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170 >>> attrs.set(u'accesskey', 'k') |
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171 >>> attrs |
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172 [(u'href', '#'), (u'accesskey', 'k')] |
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173 """ |
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174 __slots__ = [] |
| 1 | 175 |
| 176 def __init__(self, attrib=None): | |
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177 """Create the `Attributes` instance. |
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178 |
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179 If the `attrib` parameter is provided, it is expected to be a sequence |
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180 of `(name, value)` tuples. |
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181 """ |
| 27 | 182 if attrib is None: |
| 183 attrib = [] | |
| 184 list.__init__(self, [(QName(name), value) for name, value in attrib]) | |
| 1 | 185 |
| 186 def __contains__(self, name): | |
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187 """Return whether the list includes an attribute with the specified |
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188 name. |
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189 """ |
| 27 | 190 return name in [attr for attr, _ in self] |
| 1 | 191 |
| 192 def get(self, name, default=None): | |
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193 """Return the value of the attribute with the specified name, or the |
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194 value of the `default` parameter if no such attribute is found. |
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195 """ |
| 1 | 196 for attr, value in self: |
| 197 if attr == name: | |
| 198 return value | |
| 199 return default | |
| 200 | |
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201 def remove(self, name): |
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202 """Removes the attribute with the specified name. |
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203 |
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204 If no such attribute is found, this method does nothing. |
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205 """ |
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206 for idx, (attr, _) in enumerate(self): |
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207 if attr == name: |
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208 del self[idx] |
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209 break |
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210 |
| 1 | 211 def set(self, name, value): |
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212 """Sets the specified attribute to the given value. |
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213 |
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214 If an attribute with the specified name is already in the list, the |
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215 value of the existing entry is updated. Otherwise, a new attribute is |
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216 appended to the end of the list. |
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217 """ |
| 1 | 218 for idx, (attr, _) in enumerate(self): |
| 219 if attr == name: | |
| 220 self[idx] = (attr, value) | |
| 221 break | |
| 222 else: | |
| 223 self.append((QName(name), value)) | |
| 224 | |
| 225 | |
| 226 class Markup(unicode): | |
| 227 """Marks a string as being safe for inclusion in HTML/XML output without | |
| 228 needing to be escaped. | |
| 229 """ | |
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230 __slots__ = [] |
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231 |
| 27 | 232 def __new__(cls, text='', *args): |
| 1 | 233 if args: |
| 234 text %= tuple([escape(arg) for arg in args]) | |
| 27 | 235 return unicode.__new__(cls, text) |
| 1 | 236 |
| 237 def __add__(self, other): | |
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238 return Markup(unicode(self) + escape(other)) |
| 1 | 239 |
| 240 def __mod__(self, args): | |
| 241 if not isinstance(args, (list, tuple)): | |
| 242 args = [args] | |
| 243 return Markup(unicode.__mod__(self, | |
| 244 tuple([escape(arg) for arg in args]))) | |
| 245 | |
| 246 def __mul__(self, num): | |
| 247 return Markup(unicode(self) * num) | |
| 248 | |
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249 def __repr__(self): |
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250 return '<%s "%s">' % (self.__class__.__name__, self) |
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251 |
| 54 | 252 def join(self, seq, escape_quotes=True): |
| 253 return Markup(unicode(self).join([escape(item, quotes=escape_quotes) | |
| 34 | 254 for item in seq])) |
| 1 | 255 |
| 256 def stripentities(self, keepxmlentities=False): | |
| 257 """Return a copy of the text with any character or numeric entities | |
| 258 replaced by the equivalent UTF-8 characters. | |
| 259 | |
| 260 If the `keepxmlentities` parameter is provided and evaluates to `True`, | |
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261 the core XML entities (&, ', >, < and ") are not |
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262 stripped. |
| 1 | 263 """ |
| 264 def _replace_entity(match): | |
| 265 if match.group(1): # numeric entity | |
| 266 ref = match.group(1) | |
| 267 if ref.startswith('x'): | |
| 268 ref = int(ref[1:], 16) | |
| 269 else: | |
| 270 ref = int(ref, 10) | |
| 271 return unichr(ref) | |
| 272 else: # character entity | |
| 273 ref = match.group(2) | |
| 27 | 274 if keepxmlentities and ref in ('amp', 'apos', 'gt', 'lt', |
| 275 'quot'): | |
| 1 | 276 return '&%s;' % ref |
| 277 try: | |
| 278 codepoint = htmlentitydefs.name2codepoint[ref] | |
| 279 return unichr(codepoint) | |
| 280 except KeyError: | |
| 281 if keepxmlentities: | |
| 282 return '&%s;' % ref | |
| 283 else: | |
| 284 return ref | |
| 285 return Markup(re.sub(r'&(?:#((?:\d+)|(?:[xX][0-9a-fA-F]+));?|(\w+);)', | |
| 286 _replace_entity, self)) | |
| 287 | |
| 288 def striptags(self): | |
| 289 """Return a copy of the text with all XML/HTML tags removed.""" | |
| 290 return Markup(re.sub(r'<[^>]*?>', '', self)) | |
| 291 | |
| 292 def escape(cls, text, quotes=True): | |
| 293 """Create a Markup instance from a string and escape special characters | |
| 294 it may contain (<, >, & and \"). | |
| 295 | |
| 296 If the `quotes` parameter is set to `False`, the \" character is left | |
| 297 as is. Escaping quotes is generally only required for strings that are | |
| 298 to be used in attribute values. | |
| 299 """ | |
| 73 | 300 if not text: |
| 301 return cls() | |
| 302 if type(text) is cls: | |
| 1 | 303 return text |
| 73 | 304 text = unicode(text).replace('&', '&') \ |
| 305 .replace('<', '<') \ | |
| 306 .replace('>', '>') | |
| 1 | 307 if quotes: |
| 308 text = text.replace('"', '"') | |
| 309 return cls(text) | |
| 310 escape = classmethod(escape) | |
| 311 | |
| 312 def unescape(self): | |
| 313 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
| 314 if not self: | |
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315 return u'' |
| 1 | 316 return unicode(self).replace('"', '"') \ |
| 317 .replace('>', '>') \ | |
| 318 .replace('<', '<') \ | |
| 319 .replace('&', '&') | |
| 320 | |
| 321 def plaintext(self, keeplinebreaks=True): | |
| 6 | 322 """Returns the text as a `unicode` string with all entities and tags |
| 323 removed. | |
| 324 """ | |
| 1 | 325 text = unicode(self.striptags().stripentities()) |
| 326 if not keeplinebreaks: | |
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327 text = text.replace(u'\n', u' ') |
| 1 | 328 return text |
| 329 | |
| 330 def sanitize(self): | |
| 331 from markup.filters import HTMLSanitizer | |
| 332 from markup.input import HTMLParser | |
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333 text = StringIO(self.stripentities(keepxmlentities=True)) |
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334 return Stream(HTMLSanitizer()(HTMLParser(text))) |
| 1 | 335 |
| 336 | |
| 337 escape = Markup.escape | |
| 338 | |
| 339 def unescape(text): | |
| 340 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
| 341 if not isinstance(text, Markup): | |
| 342 return text | |
| 343 return text.unescape() | |
| 344 | |
| 345 | |
| 346 class Namespace(object): | |
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347 """Utility class creating and testing elements with a namespace. |
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348 |
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349 Internally, namespace URIs are encoded in the `QName` of any element or |
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350 attribute, the namespace URI being enclosed in curly braces. This class |
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351 helps create and test these strings. |
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352 |
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353 A `Namespace` object is instantiated with the namespace URI. |
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354 |
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355 >>> html = Namespace('http://www.w3.org/1999/xhtml') |
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356 >>> html |
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357 <Namespace "http://www.w3.org/1999/xhtml"> |
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358 >>> html.uri |
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359 u'http://www.w3.org/1999/xhtml' |
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360 |
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361 The `Namespace` object can than be used to generate `QName` objects with |
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362 that namespace: |
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363 |
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364 >>> html.body |
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365 u'{http://www.w3.org/1999/xhtml}body' |
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366 >>> html.body.localname |
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367 u'body' |
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368 >>> html.body.namespace |
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369 u'http://www.w3.org/1999/xhtml' |
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370 |
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371 The same works using item access notation, which is useful for element or |
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372 attribute names that are not valid Python identifiers: |
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373 |
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374 >>> html['body'] |
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375 u'{http://www.w3.org/1999/xhtml}body' |
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376 |
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377 A `Namespace` object can also be used to test whether a specific `QName` |
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378 belongs to that namespace using the `in` operator: |
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379 |
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380 >>> qname = html.body |
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381 >>> qname in html |
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382 True |
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383 >>> qname in Namespace('http://www.w3.org/2002/06/xhtml2') |
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384 False |
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385 """ |
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386 def __init__(self, uri): |
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387 self.uri = unicode(uri) |
| 1 | 388 |
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389 def __contains__(self, qname): |
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390 return qname.namespace == self.uri |
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391 |
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392 def __eq__(self, other): |
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393 if isinstance(other, Namespace): |
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394 return self.uri == other.uri |
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395 return self.uri == other |
| 1 | 396 |
| 397 def __getitem__(self, name): | |
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398 return QName(self.uri + u'}' + name) |
| 1 | 399 __getattr__ = __getitem__ |
| 400 | |
| 401 def __repr__(self): | |
| 402 return '<Namespace "%s">' % self.uri | |
| 403 | |
| 404 def __str__(self): | |
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405 return self.uri.encode('utf-8') |
| 1 | 406 |
| 407 def __unicode__(self): | |
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408 return self.uri |
| 1 | 409 |
| 410 | |
| 411 class QName(unicode): | |
| 412 """A qualified element or attribute name. | |
| 413 | |
| 414 The unicode value of instances of this class contains the qualified name of | |
| 415 the element or attribute, in the form `{namespace}localname`. The namespace | |
| 416 URI can be obtained through the additional `namespace` attribute, while the | |
| 417 local name can be accessed through the `localname` attribute. | |
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418 |
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419 >>> qname = QName('foo') |
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420 >>> qname |
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421 u'foo' |
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422 >>> qname.localname |
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423 u'foo' |
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424 >>> qname.namespace |
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425 |
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426 >>> qname = QName('http://www.w3.org/1999/xhtml}body') |
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427 >>> qname |
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428 u'{http://www.w3.org/1999/xhtml}body' |
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429 >>> qname.localname |
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430 u'body' |
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431 >>> qname.namespace |
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432 u'http://www.w3.org/1999/xhtml' |
| 1 | 433 """ |
| 434 __slots__ = ['namespace', 'localname'] | |
| 435 | |
| 436 def __new__(cls, qname): | |
| 437 if isinstance(qname, QName): | |
| 438 return qname | |
| 439 | |
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440 parts = qname.split(u'}', 1) |
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441 if qname.find(u'}') > 0: |
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442 self = unicode.__new__(cls, u'{' + qname) |
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443 self.namespace = unicode(parts[0]) |
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444 self.localname = unicode(parts[1]) |
| 1 | 445 else: |
| 446 self = unicode.__new__(cls, qname) | |
| 447 self.namespace = None | |
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448 self.localname = unicode(qname) |
| 1 | 449 return self |