Mercurial > genshi > mirror
annotate markup/template.py @ 29:ab8703fa68b8 trunk
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
that information.
* More docstrings.
author | cmlenz |
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date | Wed, 28 Jun 2006 10:40:39 +0000 |
parents | b4f78c05e5c9 |
children | 2ab5fa60575d |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
3 # Copyright (C) 2006 Christopher Lenz | |
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 | |
27 | 8 # are also available at http://markup.cmlenz.net/wiki/License. |
1 | 9 # |
10 # This software consists of voluntary contributions made by many | |
11 # individuals. For the exact contribution history, see the revision | |
27 | 12 # history and logs, available at http://markup.cmlenz.net/log/. |
1 | 13 |
14 """Template engine that is compatible with Kid (http://kid.lesscode.org) to a | |
15 certain extent. | |
16 | |
17 Differences include: | |
18 * No generation of Python code for a template; the template is "interpreted" | |
19 * No support for <?python ?> processing instructions | |
20 * Expressions are evaluated in a more flexible manner, meaning you can use e.g. | |
21 attribute access notation to access items in a dictionary, etc | |
22 * Use of XInclude and match templates instead of Kid's py:extends/py:layout | |
23 directives | |
24 * Real (thread-safe) search path support | |
25 * No dependency on ElementTree (due to the lack of pos info) | |
26 * The original pos of parse events is kept throughout the processing | |
27 pipeline, so that errors can be tracked back to a specific line/column in | |
28 the template file | |
29 * py:match directives use (basic) XPath expressions to match against input | |
30 nodes, making match templates more powerful while keeping the syntax simple | |
31 | |
32 Todo items: | |
33 * Improved error reporting | |
34 * Support for using directives as elements and not just as attributes, reducing | |
35 the need for wrapper elements with py:strip="" | |
36 * Support for py:choose/py:when/py:otherwise (similar to XSLT) | |
37 * Support for list comprehensions and generator expressions in expressions | |
38 | |
39 Random thoughts: | |
40 * Is there any need to support py:extends and/or py:layout? | |
41 * Could we generate byte code from expressions? | |
42 """ | |
43 | |
44 import compiler | |
45 import os | |
21
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46 import posixpath |
1 | 47 import re |
48 from StringIO import StringIO | |
49 | |
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50 from markup.core import Attributes, Namespace, Stream, StreamEventKind |
1 | 51 from markup.eval import Expression |
52 from markup.input import HTML, XMLParser, XML | |
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53 from markup.path import Path |
1 | 54 |
55 __all__ = ['Context', 'BadDirectiveError', 'TemplateError', | |
56 'TemplateSyntaxError', 'TemplateNotFound', 'Template', | |
57 'TemplateLoader'] | |
58 | |
59 | |
60 class TemplateError(Exception): | |
61 """Base exception class for errors related to template processing.""" | |
62 | |
63 | |
64 class TemplateSyntaxError(TemplateError): | |
65 """Exception raised when an expression in a template causes a Python syntax | |
66 error.""" | |
67 | |
68 def __init__(self, message, filename='<string>', lineno=-1, offset=-1): | |
69 if isinstance(message, SyntaxError) and message.lineno is not None: | |
70 message = str(message).replace(' (line %d)' % message.lineno, '') | |
71 TemplateError.__init__(self, message) | |
72 self.filename = filename | |
73 self.lineno = lineno | |
74 self.offset = offset | |
75 | |
76 | |
77 class BadDirectiveError(TemplateSyntaxError): | |
78 """Exception raised when an unknown directive is encountered when parsing | |
79 a template. | |
80 | |
81 An unknown directive is any attribute using the namespace for directives, | |
82 with a local name that doesn't match any registered directive. | |
83 """ | |
84 | |
85 def __init__(self, name, filename='<string>', lineno=-1): | |
86 TemplateSyntaxError.__init__(self, 'Bad directive "%s"' % name.localname, | |
87 filename, lineno) | |
88 | |
89 | |
90 class TemplateNotFound(TemplateError): | |
91 """Exception raised when a specific template file could not be found.""" | |
92 | |
93 def __init__(self, name, search_path): | |
94 TemplateError.__init__(self, 'Template "%s" not found' % name) | |
95 self.search_path = search_path | |
96 | |
97 | |
98 class Context(object): | |
99 """A container for template input data. | |
100 | |
101 A context provides a stack of scopes. Template directives such as loops can | |
102 push a new scope on the stack with data that should only be available | |
103 inside the loop. When the loop terminates, that scope can get popped off | |
104 the stack again. | |
105 | |
106 >>> ctxt = Context(one='foo', other=1) | |
107 >>> ctxt.get('one') | |
108 'foo' | |
109 >>> ctxt.get('other') | |
110 1 | |
111 >>> ctxt.push(one='frost') | |
112 >>> ctxt.get('one') | |
113 'frost' | |
114 >>> ctxt.get('other') | |
115 1 | |
116 >>> ctxt.pop() | |
117 >>> ctxt.get('one') | |
118 'foo' | |
119 """ | |
120 | |
121 def __init__(self, **data): | |
122 self.stack = [data] | |
123 | |
124 def __getitem__(self, key): | |
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125 """Get a variable's value, starting at the current context frame and |
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126 going upward. |
1 | 127 """ |
128 return self.get(key) | |
129 | |
130 def __repr__(self): | |
131 return repr(self.stack) | |
132 | |
133 def __setitem__(self, key, value): | |
134 """Set a variable in the current context.""" | |
135 self.stack[0][key] = value | |
136 | |
137 def get(self, key): | |
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138 """Get a variable's value, starting at the current context frame and |
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139 going upward. |
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140 """ |
1 | 141 for frame in self.stack: |
142 if key in frame: | |
143 return frame[key] | |
144 | |
145 def push(self, **data): | |
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146 """Push a new context frame on the stack.""" |
1 | 147 self.stack.insert(0, data) |
148 | |
149 def pop(self): | |
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150 """Pop the top-most context frame from the stack. |
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151 |
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152 If the stack is empty, an `AssertionError` is raised. |
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153 """ |
1 | 154 assert self.stack, 'Pop from empty context stack' |
155 self.stack.pop(0) | |
156 | |
157 | |
158 class Directive(object): | |
159 """Abstract base class for template directives. | |
160 | |
161 A directive is basically a callable that takes two parameters: `ctxt` is | |
162 the template data context, and `stream` is an iterable over the events that | |
163 the directive applies to. | |
164 | |
165 Directives can be "anonymous" or "registered". Registered directives can be | |
166 applied by the template author using an XML attribute with the | |
167 corresponding name in the template. Such directives should be subclasses of | |
168 this base class that can be instantiated with two parameters: `template` | |
169 is the `Template` instance, and `value` is the value of the directive | |
170 attribute. | |
171 | |
172 Anonymous directives are simply functions conforming to the protocol | |
173 described above, and can only be applied programmatically (for example by | |
174 template filters). | |
175 """ | |
176 __slots__ = ['expr'] | |
177 | |
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178 def __init__(self, value): |
1 | 179 self.expr = value and Expression(value) or None |
180 | |
181 def __call__(self, stream, ctxt): | |
182 raise NotImplementedError | |
183 | |
184 def __repr__(self): | |
185 expr = '' | |
186 if self.expr is not None: | |
187 expr = ' "%s"' % self.expr.source | |
188 return '<%s%s>' % (self.__class__.__name__, expr) | |
189 | |
190 | |
191 class AttrsDirective(Directive): | |
192 """Implementation of the `py:attrs` template directive. | |
193 | |
194 The value of the `py:attrs` attribute should be a dictionary. The keys and | |
195 values of that dictionary will be added as attributes to the element: | |
196 | |
197 >>> ctxt = Context(foo={'class': 'collapse'}) | |
198 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
199 ... <li py:attrs="foo">Bar</li> | |
200 ... </ul>''') | |
201 >>> print tmpl.generate(ctxt) | |
202 <ul> | |
203 <li class="collapse">Bar</li> | |
204 </ul> | |
205 | |
206 If the value evaluates to `None` (or any other non-truth value), no | |
207 attributes are added: | |
208 | |
209 >>> ctxt = Context(foo=None) | |
210 >>> print tmpl.generate(ctxt) | |
211 <ul> | |
212 <li>Bar</li> | |
213 </ul> | |
214 """ | |
215 def __call__(self, stream, ctxt): | |
216 kind, (tag, attrib), pos = stream.next() | |
217 attrs = self.expr.evaluate(ctxt) | |
218 if attrs: | |
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219 attrib = Attributes(attrib[:]) |
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220 if not isinstance(attrs, list): # assume it's a dict |
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221 attrs = attrs.items() |
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222 for name, value in attrs: |
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223 if value is None: |
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224 attrib.remove(name) |
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225 else: |
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226 attrib.set(name, unicode(value).strip()) |
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227 yield kind, (tag, attrib), pos |
1 | 228 for event in stream: |
229 yield event | |
230 | |
231 | |
232 class ContentDirective(Directive): | |
233 """Implementation of the `py:content` template directive. | |
234 | |
235 This directive replaces the content of the element with the result of | |
236 evaluating the value of the `py:content` attribute: | |
237 | |
238 >>> ctxt = Context(bar='Bye') | |
239 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
240 ... <li py:content="bar">Hello</li> | |
241 ... </ul>''') | |
242 >>> print tmpl.generate(ctxt) | |
243 <ul> | |
244 <li>Bye</li> | |
245 </ul> | |
246 """ | |
247 def __call__(self, stream, ctxt): | |
248 kind, data, pos = stream.next() | |
249 if kind is Stream.START: | |
250 yield kind, data, pos # emit start tag | |
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251 yield Template.EXPR, self.expr, pos |
6 | 252 previous = stream.next() |
253 for event in stream: | |
254 previous = event | |
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255 if previous is not None: |
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256 yield previous |
1 | 257 |
258 | |
259 class DefDirective(Directive): | |
260 """Implementation of the `py:def` template directive. | |
261 | |
262 This directive can be used to create "Named Template Functions", which | |
263 are template snippets that are not actually output during normal | |
264 processing, but rather can be expanded from expressions in other places | |
265 in the template. | |
266 | |
267 A named template function can be used just like a normal Python function | |
268 from template expressions: | |
269 | |
270 >>> ctxt = Context(bar='Bye') | |
271 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
272 ... <p py:def="echo(greeting, name='world')" class="message"> | |
273 ... ${greeting}, ${name}! | |
274 ... </p> | |
275 ... ${echo('hi', name='you')} | |
276 ... </div>''') | |
277 >>> print tmpl.generate(ctxt) | |
278 <div> | |
279 <p class="message"> | |
280 hi, you! | |
281 </p> | |
282 </div> | |
283 | |
284 >>> ctxt = Context(bar='Bye') | |
285 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
286 ... <p py:def="echo(greeting, name='world')" class="message"> | |
287 ... ${greeting}, ${name}! | |
288 ... </p> | |
289 ... <div py:replace="echo('hello')"></div> | |
290 ... </div>''') | |
291 >>> print tmpl.generate(ctxt) | |
292 <div> | |
293 <p class="message"> | |
294 hello, world! | |
295 </p> | |
296 </div> | |
297 """ | |
298 __slots__ = ['name', 'args', 'defaults', 'stream'] | |
299 | |
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300 def __init__(self, args): |
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301 Directive.__init__(self, None) |
1 | 302 ast = compiler.parse(args, 'eval').node |
303 self.args = [] | |
304 self.defaults = {} | |
305 if isinstance(ast, compiler.ast.CallFunc): | |
306 self.name = ast.node.name | |
307 for arg in ast.args: | |
308 if isinstance(arg, compiler.ast.Keyword): | |
309 self.args.append(arg.name) | |
310 self.defaults[arg.name] = arg.expr.value | |
311 else: | |
312 self.args.append(arg.name) | |
313 else: | |
314 self.name = ast.name | |
315 self.stream = [] | |
316 | |
317 def __call__(self, stream, ctxt): | |
318 self.stream = list(stream) | |
319 ctxt[self.name] = lambda *args, **kwargs: self._exec(ctxt, *args, | |
320 **kwargs) | |
321 return [] | |
322 | |
323 def _exec(self, ctxt, *args, **kwargs): | |
324 scope = {} | |
325 args = list(args) # make mutable | |
326 for name in self.args: | |
327 if args: | |
328 scope[name] = args.pop(0) | |
329 else: | |
330 scope[name] = kwargs.pop(name, self.defaults.get(name)) | |
331 ctxt.push(**scope) | |
332 for event in self.stream: | |
333 yield event | |
334 ctxt.pop() | |
335 | |
336 | |
337 class ForDirective(Directive): | |
338 """Implementation of the `py:for` template directive. | |
339 | |
340 >>> ctxt = Context(items=[1, 2, 3]) | |
341 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
342 ... <li py:for="item in items">${item}</li> | |
343 ... </ul>''') | |
344 >>> print tmpl.generate(ctxt) | |
345 <ul> | |
346 <li>1</li><li>2</li><li>3</li> | |
347 </ul> | |
348 """ | |
349 __slots__ = ['targets'] | |
350 | |
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351 def __init__(self, value): |
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352 targets, value = value.split(' in ', 1) |
1 | 353 self.targets = [str(name.strip()) for name in targets.split(',')] |
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354 Directive.__init__(self, value) |
1 | 355 |
356 def __call__(self, stream, ctxt): | |
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357 iterable = self.expr.evaluate(ctxt) or [] |
1 | 358 if iterable is not None: |
359 stream = list(stream) | |
360 for item in iter(iterable): | |
361 if len(self.targets) == 1: | |
362 item = [item] | |
363 scope = {} | |
364 for idx, name in enumerate(self.targets): | |
365 scope[name] = item[idx] | |
366 ctxt.push(**scope) | |
367 for event in stream: | |
368 yield event | |
369 ctxt.pop() | |
370 | |
371 def __repr__(self): | |
372 return '<%s "%s in %s">' % (self.__class__.__name__, | |
373 ', '.join(self.targets), self.expr.source) | |
374 | |
375 | |
376 class IfDirective(Directive): | |
377 """Implementation of the `py:if` template directive. | |
378 | |
379 >>> ctxt = Context(foo=True, bar='Hello') | |
380 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
381 ... <b py:if="foo">${bar}</b> | |
382 ... </div>''') | |
383 >>> print tmpl.generate(ctxt) | |
384 <div> | |
385 <b>Hello</b> | |
386 </div> | |
387 """ | |
388 def __call__(self, stream, ctxt): | |
389 if self.expr.evaluate(ctxt): | |
390 return stream | |
391 return [] | |
392 | |
393 | |
394 class MatchDirective(Directive): | |
395 """Implementation of the `py:match` template directive. | |
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396 |
1 | 397 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> |
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398 ... <span py:match="greeting"> |
1 | 399 ... Hello ${select('@name')} |
400 ... </span> | |
401 ... <greeting name="Dude" /> | |
402 ... </div>''') | |
14
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403 >>> print tmpl.generate() |
1 | 404 <div> |
405 <span> | |
406 Hello Dude | |
407 </span> | |
408 </div> | |
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409 |
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410 A match template can produce the same kind of element that it matched |
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411 without entering an infinite recursion: |
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412 |
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413 >>> tmpl = Template('''<doc xmlns:py="http://purl.org/kid/ns#"> |
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414 ... <elem py:match="elem"> |
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415 ... <div class="elem">${select('*/text()')}</div> |
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416 ... </elem> |
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417 ... <elem>Hey Joe</elem> |
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418 ... </doc>''') |
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419 >>> print tmpl.generate() |
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420 <doc> |
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421 <elem> |
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422 <div class="elem">Hey Joe</div> |
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423 </elem> |
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424 </doc> |
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425 |
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426 Match directives are applied recursively, meaning that they are also |
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427 applied to any content they may have produced themselves: |
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428 |
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429 >>> tmpl = Template('''<doc xmlns:py="http://purl.org/kid/ns#"> |
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430 ... <elem py:match="elem"> |
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431 ... <div class="elem"> |
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432 ... ${select('*/*')} |
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433 ... </div> |
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434 ... </elem> |
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435 ... <elem> |
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436 ... <subelem> |
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437 ... <elem/> |
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438 ... </subelem> |
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439 ... </elem> |
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440 ... </doc>''') |
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441 >>> print tmpl.generate() |
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442 <doc> |
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443 <elem> |
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444 <div class="elem"> |
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445 <subelem> |
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446 <elem> |
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447 <div class="elem"> |
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448 </div> |
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449 </elem> |
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450 </subelem> |
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451 </div> |
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452 </elem> |
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453 </doc> |
1 | 454 """ |
455 __slots__ = ['path', 'stream'] | |
456 | |
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457 def __init__(self, value): |
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458 Directive.__init__(self, None) |
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459 self.path = Path(value) |
1 | 460 self.stream = [] |
461 | |
462 def __call__(self, stream, ctxt): | |
463 self.stream = list(stream) | |
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464 ctxt._match_templates.append((self.path.test(), self.path, self.stream)) |
1 | 465 return [] |
466 | |
467 def __repr__(self): | |
14
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468 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
1 | 469 |
470 | |
471 class ReplaceDirective(Directive): | |
472 """Implementation of the `py:replace` template directive. | |
473 | |
474 >>> ctxt = Context(bar='Bye') | |
475 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
476 ... <span py:replace="bar">Hello</span> | |
477 ... </div>''') | |
478 >>> print tmpl.generate(ctxt) | |
479 <div> | |
480 Bye | |
481 </div> | |
482 | |
483 This directive is equivalent to `py:content` combined with `py:strip`, | |
484 providing a less verbose way to achieve the same effect: | |
485 | |
486 >>> ctxt = Context(bar='Bye') | |
487 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
488 ... <span py:content="bar" py:strip="">Hello</span> | |
489 ... </div>''') | |
490 >>> print tmpl.generate(ctxt) | |
491 <div> | |
492 Bye | |
493 </div> | |
494 """ | |
495 def __call__(self, stream, ctxt): | |
496 kind, data, pos = stream.next() | |
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497 yield Template.EXPR, self.expr, pos |
1 | 498 |
499 | |
500 class StripDirective(Directive): | |
501 """Implementation of the `py:strip` template directive. | |
502 | |
503 When the value of the `py:strip` attribute evaluates to `True`, the element | |
504 is stripped from the output | |
505 | |
506 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
507 ... <div py:strip="True"><b>foo</b></div> | |
508 ... </div>''') | |
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509 >>> print tmpl.generate() |
1 | 510 <div> |
511 <b>foo</b> | |
512 </div> | |
513 | |
514 On the other hand, when the attribute evaluates to `False`, the element is | |
515 not stripped: | |
516 | |
517 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
518 ... <div py:strip="False"><b>foo</b></div> | |
519 ... </div>''') | |
14
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520 >>> print tmpl.generate() |
1 | 521 <div> |
522 <div><b>foo</b></div> | |
523 </div> | |
524 | |
525 Leaving the attribute value empty is equivalent to a truth value: | |
526 | |
527 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
528 ... <div py:strip=""><b>foo</b></div> | |
529 ... </div>''') | |
14
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530 >>> print tmpl.generate() |
1 | 531 <div> |
532 <b>foo</b> | |
533 </div> | |
534 | |
535 This directive is particulary interesting for named template functions or | |
536 match templates that do not generate a top-level element: | |
537 | |
538 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
539 ... <div py:def="echo(what)" py:strip=""> | |
540 ... <b>${what}</b> | |
541 ... </div> | |
542 ... ${echo('foo')} | |
543 ... </div>''') | |
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544 >>> print tmpl.generate() |
1 | 545 <div> |
546 <b>foo</b> | |
547 </div> | |
548 """ | |
549 def __call__(self, stream, ctxt): | |
550 if self.expr: | |
551 strip = self.expr.evaluate(ctxt) | |
552 else: | |
553 strip = True | |
554 if strip: | |
555 stream.next() # skip start tag | |
556 previous = stream.next() | |
557 for event in stream: | |
558 yield previous | |
559 previous = event | |
560 else: | |
561 for event in stream: | |
562 yield event | |
563 | |
564 | |
565 class Template(object): | |
566 """Can parse a template and transform it into the corresponding output | |
567 based on context data. | |
568 """ | |
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569 NAMESPACE = Namespace('http://purl.org/kid/ns#') |
1 | 570 |
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571 EXPR = StreamEventKind('EXPR') # an expression |
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572 SUB = StreamEventKind('SUB') # a "subprogram" |
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573 |
1 | 574 directives = [('def', DefDirective), |
575 ('match', MatchDirective), | |
576 ('for', ForDirective), | |
577 ('if', IfDirective), | |
578 ('replace', ReplaceDirective), | |
579 ('content', ContentDirective), | |
580 ('attrs', AttrsDirective), | |
581 ('strip', StripDirective)] | |
582 _dir_by_name = dict(directives) | |
583 _dir_order = [directive[1] for directive in directives] | |
584 | |
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585 def __init__(self, source, basedir=None, filename=None): |
1 | 586 """Initialize a template from either a string or a file-like object.""" |
587 if isinstance(source, basestring): | |
588 self.source = StringIO(source) | |
589 else: | |
590 self.source = source | |
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591 self.basedir = basedir |
1 | 592 self.filename = filename or '<string>' |
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593 if basedir and filename: |
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594 self.filepath = os.path.join(basedir, filename) |
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595 else: |
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596 self.filepath = '<string>' |
1 | 597 |
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598 self.filters = [] |
1 | 599 self.parse() |
600 | |
601 def __repr__(self): | |
21
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602 return '<%s "%s">' % (self.__class__.__name__, self.filename) |
1 | 603 |
604 def parse(self): | |
605 """Parse the template. | |
606 | |
607 The parsing stage parses the XML template and constructs a list of | |
608 directives that will be executed in the render stage. The input is | |
609 split up into literal output (markup that does not depend on the | |
610 context data) and actual directives (commands or variable | |
611 substitution). | |
612 """ | |
613 stream = [] # list of events of the "compiled" template | |
614 dirmap = {} # temporary mapping of directives to elements | |
615 ns_prefix = {} | |
616 depth = 0 | |
617 | |
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618 for kind, data, pos in XMLParser(self.source, filename=self.filename): |
1 | 619 |
620 if kind is Stream.START_NS: | |
621 # Strip out the namespace declaration for template directives | |
622 prefix, uri = data | |
623 if uri == self.NAMESPACE: | |
624 ns_prefix[prefix] = uri | |
625 else: | |
626 stream.append((kind, data, pos)) | |
627 | |
628 elif kind is Stream.END_NS: | |
629 if data in ns_prefix: | |
630 del ns_prefix[data] | |
631 else: | |
632 stream.append((kind, data, pos)) | |
633 | |
634 elif kind is Stream.START: | |
635 # Record any directive attributes in start tags | |
636 tag, attrib = data | |
637 directives = [] | |
638 new_attrib = [] | |
639 for name, value in attrib: | |
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640 if name in self.NAMESPACE: |
1 | 641 cls = self._dir_by_name.get(name.localname) |
642 if cls is None: | |
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643 raise BadDirectiveError(name, self.filename, pos[1]) |
1 | 644 else: |
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645 directives.append(cls(value)) |
1 | 646 else: |
647 value = list(self._interpolate(value, *pos)) | |
648 new_attrib.append((name, value)) | |
649 if directives: | |
650 directives.sort(lambda a, b: cmp(self._dir_order.index(a.__class__), | |
651 self._dir_order.index(b.__class__))) | |
652 dirmap[(depth, tag)] = (directives, len(stream)) | |
653 | |
654 stream.append((kind, (tag, Attributes(new_attrib)), pos)) | |
655 depth += 1 | |
656 | |
657 elif kind is Stream.END: | |
658 depth -= 1 | |
659 stream.append((kind, data, pos)) | |
660 | |
661 # If there have have directive attributes with the corresponding | |
662 # start tag, move the events inbetween into a "subprogram" | |
663 if (depth, data) in dirmap: | |
664 directives, start_offset = dirmap.pop((depth, data)) | |
665 substream = stream[start_offset:] | |
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666 stream[start_offset:] = [(Template.SUB, |
1 | 667 (directives, substream), pos)] |
668 | |
669 elif kind is Stream.TEXT: | |
670 for kind, data, pos in self._interpolate(data, *pos): | |
671 stream.append((kind, data, pos)) | |
672 | |
673 else: | |
674 stream.append((kind, data, pos)) | |
675 | |
676 self.stream = stream | |
677 | |
678 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}') | |
679 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') | |
680 | |
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681 def _interpolate(cls, text, filename=None, lineno=-1, offset=-1): |
1 | 682 """Parse the given string and extract expressions. |
683 | |
684 This method returns a list containing both literal text and `Expression` | |
685 objects. | |
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686 |
1 | 687 @param text: the text to parse |
688 @param lineno: the line number at which the text was found (optional) | |
689 @param offset: the column number at which the text starts in the source | |
690 (optional) | |
691 """ | |
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692 patterns = [Template._FULL_EXPR_RE, Template._SHORT_EXPR_RE] |
1 | 693 def _interpolate(text): |
694 for idx, group in enumerate(patterns.pop(0).split(text)): | |
695 if idx % 2: | |
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696 yield Template.EXPR, Expression(group), (lineno, offset) |
1 | 697 elif group: |
698 if patterns: | |
699 for result in _interpolate(group): | |
700 yield result | |
701 else: | |
702 yield Stream.TEXT, group.replace('$$', '$'), \ | |
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703 (filename, lineno, offset) |
1 | 704 return _interpolate(text) |
705 _interpolate = classmethod(_interpolate) | |
706 | |
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707 def generate(self, ctxt=None): |
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708 """Apply the template to the given context data. |
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709 |
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710 @param ctxt: a `Context` instance containing the data for the template |
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711 @return: a markup event stream representing the result of applying |
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712 the template to the context data. |
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
713 """ |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
714 if ctxt is None: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
715 ctxt = Context() |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
716 if not hasattr(ctxt, '_match_templates'): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
717 ctxt._match_templates = [] |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
718 |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
719 stream = self._match(self._eval(self.stream, ctxt), ctxt) |
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
720 return Stream(self._flatten(stream, ctxt)) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
721 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
722 def _eval(self, stream, ctxt=None): |
29
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
723 """Internal stream filter that evaluates any expressions in `START` and |
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
724 `TEXT` events. |
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
725 """ |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
726 for kind, data, pos in stream: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
727 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
728 if kind is Stream.START: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
729 # Attributes may still contain expressions in start tags at |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
730 # this point, so do some evaluation |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
731 tag, attrib = data |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
732 new_attrib = [] |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
733 for name, substream in attrib: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
734 if isinstance(substream, basestring): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
735 value = substream |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
736 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
737 values = [] |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
738 for subkind, subdata, subpos in substream: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
739 if subkind is Template.EXPR: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
740 values.append(subdata.evaluate(ctxt)) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
741 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
742 values.append(subdata) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
743 value = filter(lambda x: x is not None, values) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
744 if not value: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
745 continue |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
746 new_attrib.append((name, u''.join(value))) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
747 yield kind, (tag, Attributes(new_attrib)), pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
748 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
749 elif kind is Template.EXPR: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
750 result = data.evaluate(ctxt) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
751 if result is None: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
752 continue |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
753 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
754 # First check for a string, otherwise the iterable test below |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
755 # succeeds, and the string will be chopped up into individual |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
756 # characters |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
757 if isinstance(result, basestring): |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
758 yield Stream.TEXT, unicode(result), pos |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
759 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
760 # Test if the expression evaluated to an iterable, in which |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
761 # case we yield the individual items |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
762 try: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
763 yield (Template.SUB, ([], iter(result)), pos) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
764 except TypeError: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
765 # Neither a string nor an iterable, so just pass it |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
766 # through |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
767 yield Stream.TEXT, unicode(result), pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
768 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
769 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
770 yield kind, data, pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
771 |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
772 def _flatten(self, stream, ctxt=None): |
29
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
773 """Internal stream filter that expands `SUB` events in the stream.""" |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
774 for filter_ in self.filters: |
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
775 stream = filter_(iter(stream), ctxt) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
776 try: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
777 for kind, data, pos in stream: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
778 if kind is Template.SUB: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
779 # This event is a list of directives and a list of |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
780 # nested events to which those directives should be |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
781 # applied |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
782 directives, substream = data |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
783 directives.reverse() |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
784 for directive in directives: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
785 substream = directive(iter(substream), ctxt) |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
786 substream = self._match(self._eval(substream, ctxt), ctxt) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
787 for event in self._flatten(substream, ctxt): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
788 yield event |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
789 continue |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
790 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
791 yield kind, data, pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
792 except SyntaxError, err: |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
793 raise TemplateSyntaxError(err, self.filename, pos[1], |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
794 pos[2] + (err.offset or 0)) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
795 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
796 def _match(self, stream, ctxt=None): |
29
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
797 """Internal stream filter that applies any defined match templates |
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
798 to the stream. |
ab8703fa68b8
* Minor simplification of template directives: they no longer get passed the template instance and the position, as no directive was actually using
cmlenz
parents:
27
diff
changeset
|
799 """ |
17
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Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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800 for kind, data, pos in stream: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
801 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
802 # We (currently) only care about start and end events for matching |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
803 # We might care about namespace events in the future, though |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
804 if kind not in (Stream.START, Stream.END): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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805 yield kind, data, pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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14
diff
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|
806 continue |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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|
807 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
808 for idx, (test, path, template) in enumerate(ctxt._match_templates): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
809 if (kind, data, pos) in template[::len(template)]: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
810 # This is the event this match template produced itself, so |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
811 # matching it again would result in an infinite loop |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
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diff
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|
812 continue |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
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diff
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|
813 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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|
814 result = test(kind, data, pos) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
815 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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816 if result: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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817 # Consume and store all events until an end event |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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818 # corresponding to this start event is encountered |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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819 content = [(kind, data, pos)] |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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820 depth = 1 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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821 while depth > 0: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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822 event = stream.next() |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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823 if event[0] is Stream.START: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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diff
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|
824 depth += 1 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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825 elif event[0] is Stream.END: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
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|
826 depth -= 1 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
827 content.append(event) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
828 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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829 # enable the path to keep track of the stream state |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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830 test(*event) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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831 |
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
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832 content = list(self._flatten(content, ctxt)) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
833 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
834 def _apply(stream, ctxt): |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
835 ctxt.push(select=lambda path: Stream(stream).select(path)) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
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|
836 for event in template: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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14
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|
837 yield event |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
838 ctxt.pop() |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
839 |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
840 yield (Template.SUB, |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
841 ([lambda stream, ctxt: _apply(content, ctxt)], |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
842 []), content[0][-1]) |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
843 break |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
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|
844 else: |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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parents:
14
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|
845 yield kind, data, pos |
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
846 |
1 | 847 |
848 class TemplateLoader(object): | |
849 """Responsible for loading templates from files on the specified search | |
850 path. | |
851 | |
852 >>> import tempfile | |
853 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
854 >>> os.write(fd, '<p>$var</p>') | |
855 11 | |
856 >>> os.close(fd) | |
857 | |
858 The template loader accepts a list of directory paths that are then used | |
859 when searching for template files, in the given order: | |
860 | |
861 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
862 | |
863 The `load()` method first checks the template cache whether the requested | |
864 template has already been loaded. If not, it attempts to locate the | |
865 template file, and returns the corresponding `Template` object: | |
866 | |
867 >>> template = loader.load(os.path.basename(path)) | |
868 >>> isinstance(template, Template) | |
869 True | |
870 | |
871 Template instances are cached: requesting a template with the same name | |
872 results in the same instance being returned: | |
873 | |
874 >>> loader.load(os.path.basename(path)) is template | |
875 True | |
876 """ | |
877 def __init__(self, search_path=None, auto_reload=False): | |
878 """Create the template laoder. | |
879 | |
880 @param search_path: a list of absolute path names that should be | |
881 searched for template files | |
882 @param auto_reload: whether to check the last modification time of | |
883 template files, and reload them if they have changed | |
884 """ | |
885 self.search_path = search_path | |
886 if self.search_path is None: | |
887 self.search_path = [] | |
888 self.auto_reload = auto_reload | |
889 self._cache = {} | |
890 self._mtime = {} | |
891 | |
21
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* Include paths are now interpreted relative to the path of the including template. Closes #3.
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892 def load(self, filename, relative_to=None): |
1 | 893 """Load the template with the given name. |
894 | |
22
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
895 If the `filename` parameter is relative, this method searches the search |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
896 path trying to locate a template matching the given name. If the file |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
897 name is an absolute path, the search path is not bypassed. |
1 | 898 |
22
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
899 If requested template is not found, a `TemplateNotFound` exception is |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
900 raised. Otherwise, a `Template` object is returned that represents the |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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21
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changeset
|
901 parsed template. |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
902 |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
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diff
changeset
|
903 Template instances are cached to avoid having to parse the same |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
904 template file more than once. Thus, subsequent calls of this method |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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21
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changeset
|
905 with the same template file name will return the same `Template` |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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|
906 object (unless the `auto_reload` option is enabled and the file was |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
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|
907 changed since the last parse.) |
1 | 908 |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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|
909 If the `relative_to` parameter is provided, the `filename` is |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
910 interpreted as being relative to that path. |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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|
911 |
1 | 912 @param filename: the relative path of the template file to load |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
913 @param relative_to: the filename of the template from which the new |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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diff
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|
914 template is being loaded, or `None` if the template is being loaded |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
915 directly |
1 | 916 """ |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
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|
917 if relative_to: |
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
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changeset
|
918 filename = posixpath.join(posixpath.dirname(relative_to), filename) |
1 | 919 filename = os.path.normpath(filename) |
22
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
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|
920 |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
921 # First check the cache to avoid reparsing the same file |
1 | 922 try: |
923 tmpl = self._cache[filename] | |
924 if not self.auto_reload or \ | |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
925 os.path.getmtime(tmpl.filepath) == self._mtime[filename]: |
1 | 926 return tmpl |
927 except KeyError: | |
928 pass | |
22
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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parents:
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|
929 |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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diff
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|
930 # Bypass the search path if the filename is absolute |
2483fe549959
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
931 search_path = self.search_path |
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Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
932 if os.path.isabs(filename): |
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Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
933 search_path = [os.path.dirname(filename)] |
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Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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|
934 |
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Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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diff
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|
935 for dirname in search_path: |
1 | 936 filepath = os.path.join(dirname, filename) |
937 try: | |
938 fileobj = file(filepath, 'rt') | |
939 try: | |
22
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Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
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21
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|
940 from markup.filters import IncludeFilter |
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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|
941 tmpl = Template(fileobj, basedir=dirname, filename=filename) |
17
74cc70129d04
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
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|
942 tmpl.filters.append(IncludeFilter(self)) |
1 | 943 finally: |
944 fileobj.close() | |
945 self._cache[filename] = tmpl | |
946 self._mtime[filename] = os.path.getmtime(filepath) | |
947 return tmpl | |
948 except IOError: | |
949 continue | |
950 raise TemplateNotFound(filename, self.search_path) |