Mercurial > genshi > genshi-test
annotate markup/core.py @ 133:b9a0031d4bbb
Minor cleanup and performance improvement for the builder module.
| author | cmlenz |
|---|---|
| date | Sun, 06 Aug 2006 17:10:47 +0000 |
| parents | 93bbdcf9428b |
| children | 636e0100fcaf |
| 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 filter(self, *filters): |
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68 """Apply filters to the stream. |
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69 |
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70 This method returns a new stream with the given filters applied. The |
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71 filters must be callables that accept the stream object as parameter, |
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72 and return the filtered stream. |
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73 """ |
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74 stream = self |
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75 for filter_ in filters: |
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76 stream = filter_(iter(stream)) |
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77 return Stream(stream) |
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78 |
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79 def render(self, method='xml', encoding='utf-8', **kwargs): |
| 1 | 80 """Return a string representation of the stream. |
| 81 | |
| 82 @param method: determines how the stream is serialized; can be either | |
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83 "xml", "xhtml", or "html", or a custom `Serializer` |
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84 subclass |
| 1 | 85 @param encoding: how the output string should be encoded; if set to |
| 86 `None`, this method returns a `unicode` object | |
| 87 | |
| 88 Any additional keyword arguments are passed to the serializer, and thus | |
| 89 depend on the `method` parameter value. | |
| 90 """ | |
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91 generator = self.serialize(method=method, **kwargs) |
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92 output = u''.join(list(generator)) |
| 1 | 93 if encoding is not None: |
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94 return output.encode(encoding) |
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95 return output |
| 1 | 96 |
| 97 def select(self, path): | |
| 98 """Return a new stream that contains the events matching the given | |
| 99 XPath expression. | |
| 100 | |
| 101 @param path: a string containing the XPath expression | |
| 102 """ | |
| 103 from markup.path import Path | |
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104 return Path(path).select(self) |
| 1 | 105 |
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106 def serialize(self, method='xml', **kwargs): |
| 1 | 107 """Generate strings corresponding to a specific serialization of the |
| 108 stream. | |
| 109 | |
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110 Unlike the `render()` method, this method is a generator that returns |
| 1 | 111 the serialized output incrementally, as opposed to returning a single |
| 112 string. | |
| 113 | |
| 114 @param method: determines how the stream is serialized; can be either | |
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115 "xml", "xhtml", or "html", or a custom serializer class |
| 1 | 116 """ |
| 117 from markup import output | |
| 118 cls = method | |
| 119 if isinstance(method, basestring): | |
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120 cls = {'xml': output.XMLSerializer, |
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121 'xhtml': output.XHTMLSerializer, |
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122 'html': output.HTMLSerializer}[method] |
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123 serialize = cls(**kwargs) |
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124 return serialize(_ensure(self)) |
| 1 | 125 |
| 126 def __str__(self): | |
| 127 return self.render() | |
| 128 | |
| 129 def __unicode__(self): | |
| 130 return self.render(encoding=None) | |
| 131 | |
| 132 | |
| 69 | 133 START = Stream.START |
| 134 END = Stream.END | |
| 135 TEXT = Stream.TEXT | |
| 136 PROLOG = Stream.PROLOG | |
| 137 DOCTYPE = Stream.DOCTYPE | |
| 138 START_NS = Stream.START_NS | |
| 139 END_NS = Stream.END_NS | |
| 140 PI = Stream.PI | |
| 141 COMMENT = Stream.COMMENT | |
| 142 | |
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143 def _ensure(stream): |
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144 """Ensure that every item on the stream is actually a markup event.""" |
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145 for event in stream: |
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146 try: |
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147 kind, data, pos = event |
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148 except ValueError: |
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149 kind, data, pos = event.totuple() |
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150 yield kind, data, pos |
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151 |
| 69 | 152 |
| 1 | 153 class Attributes(list): |
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154 """Sequence type that stores the attributes of an element. |
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155 |
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156 The order of the attributes is preserved, while accessing and manipulating |
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157 attributes by name is also supported. |
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158 |
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159 >>> attrs = Attributes([('href', '#'), ('title', 'Foo')]) |
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160 >>> attrs |
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161 [(u'href', '#'), (u'title', 'Foo')] |
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162 |
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163 >>> 'href' in attrs |
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164 True |
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165 >>> 'tabindex' in attrs |
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166 False |
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167 |
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168 >>> attrs.get(u'title') |
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169 'Foo' |
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170 >>> attrs.set(u'title', 'Bar') |
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171 >>> attrs |
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172 [(u'href', '#'), (u'title', 'Bar')] |
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173 >>> attrs.remove(u'title') |
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174 >>> attrs |
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175 [(u'href', '#')] |
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176 |
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177 New attributes added using the `set()` method are appended to the end of |
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178 the list: |
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179 |
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180 >>> attrs.set(u'accesskey', 'k') |
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181 >>> attrs |
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182 [(u'href', '#'), (u'accesskey', 'k')] |
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183 """ |
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184 __slots__ = [] |
| 1 | 185 |
| 186 def __init__(self, attrib=None): | |
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187 """Create the `Attributes` instance. |
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188 |
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189 If the `attrib` parameter is provided, it is expected to be a sequence |
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190 of `(name, value)` tuples. |
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191 """ |
| 27 | 192 if attrib is None: |
| 193 attrib = [] | |
| 194 list.__init__(self, [(QName(name), value) for name, value in attrib]) | |
| 1 | 195 |
| 196 def __contains__(self, name): | |
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197 """Return whether the list includes an attribute with the specified |
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198 name. |
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199 """ |
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133
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200 for attr, _ in self: |
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201 if attr == name: |
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202 return True |
| 1 | 203 |
| 204 def get(self, name, default=None): | |
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205 """Return the value of the attribute with the specified name, or the |
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206 value of the `default` parameter if no such attribute is found. |
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207 """ |
| 1 | 208 for attr, value in self: |
| 209 if attr == name: | |
| 210 return value | |
| 211 return default | |
| 212 | |
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213 def remove(self, name): |
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214 """Removes the attribute with the specified name. |
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215 |
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216 If no such attribute is found, this method does nothing. |
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217 """ |
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218 for idx, (attr, _) in enumerate(self): |
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219 if attr == name: |
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220 del self[idx] |
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221 break |
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222 |
| 1 | 223 def set(self, name, value): |
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224 """Sets the specified attribute to the given value. |
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225 |
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226 If an attribute with the specified name is already in the list, the |
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227 value of the existing entry is updated. Otherwise, a new attribute is |
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228 appended to the end of the list. |
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229 """ |
| 1 | 230 for idx, (attr, _) in enumerate(self): |
| 231 if attr == name: | |
| 232 self[idx] = (attr, value) | |
| 233 break | |
| 234 else: | |
| 235 self.append((QName(name), value)) | |
| 236 | |
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237 def totuple(self): |
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238 return TEXT, u''.join([x[1] for x in self]), (None, -1, -1) |
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239 |
| 1 | 240 |
| 116 | 241 def plaintext(text, keeplinebreaks=True): |
| 242 """Returns the text as a `unicode` string with all entities and tags | |
| 243 removed. | |
| 244 """ | |
| 245 text = stripentities(striptags(text)) | |
| 246 if not keeplinebreaks: | |
| 247 text = text.replace(u'\n', u' ') | |
| 248 return text | |
| 249 | |
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250 def stripentities(text, keepxmlentities=False): |
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251 """Return a copy of the given text with any character or numeric entities |
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252 replaced by the equivalent UTF-8 characters. |
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253 |
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254 If the `keepxmlentities` parameter is provided and evaluates to `True`, |
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255 the core XML entities (&, ', >, < and ") are not |
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256 stripped. |
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257 """ |
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258 def _replace_entity(match): |
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259 if match.group(1): # numeric entity |
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260 ref = match.group(1) |
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261 if ref.startswith('x'): |
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262 ref = int(ref[1:], 16) |
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263 else: |
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264 ref = int(ref, 10) |
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265 return unichr(ref) |
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266 else: # character entity |
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267 ref = match.group(2) |
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268 if keepxmlentities and ref in ('amp', 'apos', 'gt', 'lt', |
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269 'quot'): |
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270 return '&%s;' % ref |
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271 try: |
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272 codepoint = htmlentitydefs.name2codepoint[ref] |
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273 return unichr(codepoint) |
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274 except KeyError: |
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275 if keepxmlentities: |
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276 return '&%s;' % ref |
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277 else: |
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278 return ref |
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279 return re.sub(r'&(?:#((?:\d+)|(?:[xX][0-9a-fA-F]+));?|(\w+);)', |
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280 _replace_entity, text) |
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281 |
| 116 | 282 def striptags(text): |
| 283 """Return a copy of the text with all XML/HTML tags removed.""" | |
| 284 return re.sub(r'<[^>]*?>', '', text) | |
| 285 | |
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286 |
| 1 | 287 class Markup(unicode): |
| 288 """Marks a string as being safe for inclusion in HTML/XML output without | |
| 289 needing to be escaped. | |
| 290 """ | |
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291 __slots__ = [] |
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292 |
| 27 | 293 def __new__(cls, text='', *args): |
| 1 | 294 if args: |
| 295 text %= tuple([escape(arg) for arg in args]) | |
| 27 | 296 return unicode.__new__(cls, text) |
| 1 | 297 |
| 298 def __add__(self, other): | |
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299 return Markup(unicode(self) + escape(other)) |
| 1 | 300 |
| 301 def __mod__(self, args): | |
| 302 if not isinstance(args, (list, tuple)): | |
| 303 args = [args] | |
| 304 return Markup(unicode.__mod__(self, | |
| 305 tuple([escape(arg) for arg in args]))) | |
| 306 | |
| 307 def __mul__(self, num): | |
| 308 return Markup(unicode(self) * num) | |
| 309 | |
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310 def __repr__(self): |
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311 return '<%s "%s">' % (self.__class__.__name__, self) |
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312 |
| 54 | 313 def join(self, seq, escape_quotes=True): |
| 314 return Markup(unicode(self).join([escape(item, quotes=escape_quotes) | |
| 34 | 315 for item in seq])) |
| 1 | 316 |
| 317 def escape(cls, text, quotes=True): | |
| 318 """Create a Markup instance from a string and escape special characters | |
| 319 it may contain (<, >, & and \"). | |
| 320 | |
| 321 If the `quotes` parameter is set to `False`, the \" character is left | |
| 322 as is. Escaping quotes is generally only required for strings that are | |
| 323 to be used in attribute values. | |
| 324 """ | |
| 73 | 325 if not text: |
| 326 return cls() | |
| 327 if type(text) is cls: | |
| 1 | 328 return text |
| 73 | 329 text = unicode(text).replace('&', '&') \ |
| 330 .replace('<', '<') \ | |
| 331 .replace('>', '>') | |
| 1 | 332 if quotes: |
| 333 text = text.replace('"', '"') | |
| 334 return cls(text) | |
| 335 escape = classmethod(escape) | |
| 336 | |
| 337 def unescape(self): | |
| 338 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
| 339 if not self: | |
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340 return u'' |
| 1 | 341 return unicode(self).replace('"', '"') \ |
| 342 .replace('>', '>') \ | |
| 343 .replace('<', '<') \ | |
| 344 .replace('&', '&') | |
| 345 | |
| 116 | 346 def stripentities(self, keepxmlentities=False): |
| 347 """Return a copy of the text with any character or numeric entities | |
| 348 replaced by the equivalent UTF-8 characters. | |
| 349 | |
| 350 If the `keepxmlentities` parameter is provided and evaluates to `True`, | |
| 351 the core XML entities (&, ', >, < and ") are not | |
| 352 stripped. | |
| 6 | 353 """ |
| 116 | 354 return Markup(stripentities(self, keepxmlentities=keepxmlentities)) |
| 355 | |
| 356 def striptags(self): | |
| 357 """Return a copy of the text with all XML/HTML tags removed.""" | |
| 358 return Markup(striptags(self)) | |
| 1 | 359 |
| 360 | |
| 361 escape = Markup.escape | |
| 362 | |
| 363 def unescape(text): | |
| 364 """Reverse-escapes &, <, > and \" and returns a `unicode` object.""" | |
| 365 if not isinstance(text, Markup): | |
| 366 return text | |
| 367 return text.unescape() | |
| 368 | |
| 369 | |
| 370 class Namespace(object): | |
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371 """Utility class creating and testing elements with a namespace. |
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372 |
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373 Internally, namespace URIs are encoded in the `QName` of any element or |
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374 attribute, the namespace URI being enclosed in curly braces. This class |
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375 helps create and test these strings. |
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376 |
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377 A `Namespace` object is instantiated with the namespace URI. |
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378 |
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379 >>> html = Namespace('http://www.w3.org/1999/xhtml') |
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380 >>> html |
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381 <Namespace "http://www.w3.org/1999/xhtml"> |
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382 >>> html.uri |
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383 u'http://www.w3.org/1999/xhtml' |
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384 |
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385 The `Namespace` object can than be used to generate `QName` objects with |
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386 that namespace: |
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387 |
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388 >>> html.body |
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389 u'{http://www.w3.org/1999/xhtml}body' |
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390 >>> html.body.localname |
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391 u'body' |
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392 >>> html.body.namespace |
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393 u'http://www.w3.org/1999/xhtml' |
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394 |
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395 The same works using item access notation, which is useful for element or |
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396 attribute names that are not valid Python identifiers: |
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397 |
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398 >>> html['body'] |
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399 u'{http://www.w3.org/1999/xhtml}body' |
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400 |
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401 A `Namespace` object can also be used to test whether a specific `QName` |
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402 belongs to that namespace using the `in` operator: |
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403 |
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404 >>> qname = html.body |
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405 >>> qname in html |
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406 True |
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407 >>> qname in Namespace('http://www.w3.org/2002/06/xhtml2') |
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408 False |
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409 """ |
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410 def __init__(self, uri): |
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411 self.uri = unicode(uri) |
| 1 | 412 |
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413 def __contains__(self, qname): |
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414 return qname.namespace == self.uri |
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415 |
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416 def __eq__(self, other): |
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417 if isinstance(other, Namespace): |
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418 return self.uri == other.uri |
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419 return self.uri == other |
| 1 | 420 |
| 421 def __getitem__(self, name): | |
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422 return QName(self.uri + u'}' + name) |
| 1 | 423 __getattr__ = __getitem__ |
| 424 | |
| 425 def __repr__(self): | |
| 426 return '<Namespace "%s">' % self.uri | |
| 427 | |
| 428 def __str__(self): | |
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429 return self.uri.encode('utf-8') |
| 1 | 430 |
| 431 def __unicode__(self): | |
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432 return self.uri |
| 1 | 433 |
| 434 | |
| 435 class QName(unicode): | |
| 436 """A qualified element or attribute name. | |
| 437 | |
| 438 The unicode value of instances of this class contains the qualified name of | |
| 439 the element or attribute, in the form `{namespace}localname`. The namespace | |
| 440 URI can be obtained through the additional `namespace` attribute, while the | |
| 441 local name can be accessed through the `localname` attribute. | |
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442 |
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443 >>> qname = QName('foo') |
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444 >>> qname |
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445 u'foo' |
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446 >>> qname.localname |
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447 u'foo' |
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448 >>> qname.namespace |
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449 |
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450 >>> qname = QName('http://www.w3.org/1999/xhtml}body') |
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451 >>> qname |
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452 u'{http://www.w3.org/1999/xhtml}body' |
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453 >>> qname.localname |
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454 u'body' |
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455 >>> qname.namespace |
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456 u'http://www.w3.org/1999/xhtml' |
| 1 | 457 """ |
| 458 __slots__ = ['namespace', 'localname'] | |
| 459 | |
| 460 def __new__(cls, qname): | |
| 100 | 461 if type(qname) is cls: |
| 1 | 462 return qname |
| 463 | |
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464 parts = qname.split(u'}', 1) |
| 100 | 465 if len(parts) > 1: |
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466 self = unicode.__new__(cls, u'{' + qname) |
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467 self.namespace = unicode(parts[0]) |
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468 self.localname = unicode(parts[1]) |
| 1 | 469 else: |
| 470 self = unicode.__new__(cls, qname) | |
| 471 self.namespace = None | |
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472 self.localname = unicode(qname) |
| 1 | 473 return self |