Mercurial > genshi > genshi-test
annotate markup/template.py @ 17:ad63ad459524
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.
Also, output filters are now applied in the `Stream.serialize()` method instead of by the `Template.generate()` method, which just makes more sense.
| author | cmlenz |
|---|---|
| date | Sun, 18 Jun 2006 22:33:33 +0000 |
| parents | 76b5d4b189e6 |
| children | 4cbebb15a834 |
| rev | line source |
|---|---|
| 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 | |
| 8 # are also available at http://trac.edgewall.com/license.html. | |
| 9 # | |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
| 12 # history and logs, available at http://projects.edgewall.com/trac/. | |
| 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 | |
| 46 import re | |
| 47 from StringIO import StringIO | |
| 48 | |
|
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49 from markup.core import Attributes, Stream, StreamEventKind |
| 1 | 50 from markup.eval import Expression |
|
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ad63ad459524
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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51 from markup.filters import IncludeFilter |
| 1 | 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): | |
| 125 """Get a variable's value, starting at the current context and going | |
| 126 upward. | |
| 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): | |
| 138 for frame in self.stack: | |
| 139 if key in frame: | |
| 140 return frame[key] | |
| 141 | |
| 142 def push(self, **data): | |
| 143 self.stack.insert(0, data) | |
| 144 | |
| 145 def pop(self): | |
| 146 assert self.stack, 'Pop from empty context stack' | |
| 147 self.stack.pop(0) | |
| 148 | |
| 149 | |
| 150 class Directive(object): | |
| 151 """Abstract base class for template directives. | |
| 152 | |
| 153 A directive is basically a callable that takes two parameters: `ctxt` is | |
| 154 the template data context, and `stream` is an iterable over the events that | |
| 155 the directive applies to. | |
| 156 | |
| 157 Directives can be "anonymous" or "registered". Registered directives can be | |
| 158 applied by the template author using an XML attribute with the | |
| 159 corresponding name in the template. Such directives should be subclasses of | |
| 160 this base class that can be instantiated with two parameters: `template` | |
| 161 is the `Template` instance, and `value` is the value of the directive | |
| 162 attribute. | |
| 163 | |
| 164 Anonymous directives are simply functions conforming to the protocol | |
| 165 described above, and can only be applied programmatically (for example by | |
| 166 template filters). | |
| 167 """ | |
| 168 __slots__ = ['expr'] | |
| 169 | |
| 170 def __init__(self, template, value, pos): | |
| 171 self.expr = value and Expression(value) or None | |
| 172 | |
| 173 def __call__(self, stream, ctxt): | |
| 174 raise NotImplementedError | |
| 175 | |
| 176 def __repr__(self): | |
| 177 expr = '' | |
| 178 if self.expr is not None: | |
| 179 expr = ' "%s"' % self.expr.source | |
| 180 return '<%s%s>' % (self.__class__.__name__, expr) | |
| 181 | |
| 182 | |
| 183 class AttrsDirective(Directive): | |
| 184 """Implementation of the `py:attrs` template directive. | |
| 185 | |
| 186 The value of the `py:attrs` attribute should be a dictionary. The keys and | |
| 187 values of that dictionary will be added as attributes to the element: | |
| 188 | |
| 189 >>> ctxt = Context(foo={'class': 'collapse'}) | |
| 190 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
| 191 ... <li py:attrs="foo">Bar</li> | |
| 192 ... </ul>''') | |
| 193 >>> print tmpl.generate(ctxt) | |
| 194 <ul> | |
| 195 <li class="collapse">Bar</li> | |
| 196 </ul> | |
| 197 | |
| 198 If the value evaluates to `None` (or any other non-truth value), no | |
| 199 attributes are added: | |
| 200 | |
| 201 >>> ctxt = Context(foo=None) | |
| 202 >>> print tmpl.generate(ctxt) | |
| 203 <ul> | |
| 204 <li>Bar</li> | |
| 205 </ul> | |
| 206 """ | |
| 207 def __call__(self, stream, ctxt): | |
| 208 kind, (tag, attrib), pos = stream.next() | |
| 209 attrs = self.expr.evaluate(ctxt) | |
| 210 if attrs: | |
|
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211 attrib = Attributes(attrib[:]) |
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212 if not isinstance(attrs, list): # assume it's a dict |
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213 attrs = attrs.items() |
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214 for name, value in attrs: |
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215 if value is None: |
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216 attrib.remove(name) |
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217 else: |
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218 attrib.set(name, unicode(value).strip()) |
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219 yield kind, (tag, attrib), pos |
| 1 | 220 for event in stream: |
| 221 yield event | |
| 222 | |
| 223 | |
| 224 class ContentDirective(Directive): | |
| 225 """Implementation of the `py:content` template directive. | |
| 226 | |
| 227 This directive replaces the content of the element with the result of | |
| 228 evaluating the value of the `py:content` attribute: | |
| 229 | |
| 230 >>> ctxt = Context(bar='Bye') | |
| 231 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
| 232 ... <li py:content="bar">Hello</li> | |
| 233 ... </ul>''') | |
| 234 >>> print tmpl.generate(ctxt) | |
| 235 <ul> | |
| 236 <li>Bye</li> | |
| 237 </ul> | |
| 238 """ | |
| 239 def __call__(self, stream, ctxt): | |
| 240 kind, data, pos = stream.next() | |
| 241 if kind is Stream.START: | |
| 242 yield kind, data, pos # emit start tag | |
|
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243 yield Template.EXPR, self.expr, pos |
| 6 | 244 previous = stream.next() |
| 245 for event in stream: | |
| 246 previous = event | |
|
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247 if previous is not None: |
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248 yield previous |
| 1 | 249 |
| 250 | |
| 251 class DefDirective(Directive): | |
| 252 """Implementation of the `py:def` template directive. | |
| 253 | |
| 254 This directive can be used to create "Named Template Functions", which | |
| 255 are template snippets that are not actually output during normal | |
| 256 processing, but rather can be expanded from expressions in other places | |
| 257 in the template. | |
| 258 | |
| 259 A named template function can be used just like a normal Python function | |
| 260 from template expressions: | |
| 261 | |
| 262 >>> ctxt = Context(bar='Bye') | |
| 263 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 264 ... <p py:def="echo(greeting, name='world')" class="message"> | |
| 265 ... ${greeting}, ${name}! | |
| 266 ... </p> | |
| 267 ... ${echo('hi', name='you')} | |
| 268 ... </div>''') | |
| 269 >>> print tmpl.generate(ctxt) | |
| 270 <div> | |
| 271 <p class="message"> | |
| 272 hi, you! | |
| 273 </p> | |
| 274 </div> | |
| 275 | |
| 276 >>> ctxt = Context(bar='Bye') | |
| 277 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 278 ... <p py:def="echo(greeting, name='world')" class="message"> | |
| 279 ... ${greeting}, ${name}! | |
| 280 ... </p> | |
| 281 ... <div py:replace="echo('hello')"></div> | |
| 282 ... </div>''') | |
| 283 >>> print tmpl.generate(ctxt) | |
| 284 <div> | |
| 285 <p class="message"> | |
| 286 hello, world! | |
| 287 </p> | |
| 288 </div> | |
| 289 """ | |
| 290 __slots__ = ['name', 'args', 'defaults', 'stream'] | |
| 291 | |
| 292 def __init__(self, template, args, pos): | |
| 293 Directive.__init__(self, template, None, pos) | |
| 294 ast = compiler.parse(args, 'eval').node | |
| 295 self.args = [] | |
| 296 self.defaults = {} | |
| 297 if isinstance(ast, compiler.ast.CallFunc): | |
| 298 self.name = ast.node.name | |
| 299 for arg in ast.args: | |
| 300 if isinstance(arg, compiler.ast.Keyword): | |
| 301 self.args.append(arg.name) | |
| 302 self.defaults[arg.name] = arg.expr.value | |
| 303 else: | |
| 304 self.args.append(arg.name) | |
| 305 else: | |
| 306 self.name = ast.name | |
| 307 self.stream = [] | |
| 308 | |
| 309 def __call__(self, stream, ctxt): | |
| 310 self.stream = list(stream) | |
| 311 ctxt[self.name] = lambda *args, **kwargs: self._exec(ctxt, *args, | |
| 312 **kwargs) | |
| 313 return [] | |
| 314 | |
| 315 def _exec(self, ctxt, *args, **kwargs): | |
| 316 scope = {} | |
| 317 args = list(args) # make mutable | |
| 318 for name in self.args: | |
| 319 if args: | |
| 320 scope[name] = args.pop(0) | |
| 321 else: | |
| 322 scope[name] = kwargs.pop(name, self.defaults.get(name)) | |
| 323 ctxt.push(**scope) | |
| 324 for event in self.stream: | |
| 325 yield event | |
| 326 ctxt.pop() | |
| 327 | |
| 328 | |
| 329 class ForDirective(Directive): | |
| 330 """Implementation of the `py:for` template directive. | |
| 331 | |
| 332 >>> ctxt = Context(items=[1, 2, 3]) | |
| 333 >>> tmpl = Template('''<ul xmlns:py="http://purl.org/kid/ns#"> | |
| 334 ... <li py:for="item in items">${item}</li> | |
| 335 ... </ul>''') | |
| 336 >>> print tmpl.generate(ctxt) | |
| 337 <ul> | |
| 338 <li>1</li><li>2</li><li>3</li> | |
| 339 </ul> | |
| 340 """ | |
| 341 __slots__ = ['targets'] | |
| 342 | |
| 343 def __init__(self, template, value, pos): | |
| 344 targets, expr_source = value.split(' in ', 1) | |
| 345 self.targets = [str(name.strip()) for name in targets.split(',')] | |
| 346 Directive.__init__(self, template, expr_source, pos) | |
| 347 | |
| 348 def __call__(self, stream, ctxt): | |
|
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349 iterable = self.expr.evaluate(ctxt) or [] |
| 1 | 350 if iterable is not None: |
| 351 stream = list(stream) | |
| 352 for item in iter(iterable): | |
| 353 if len(self.targets) == 1: | |
| 354 item = [item] | |
| 355 scope = {} | |
| 356 for idx, name in enumerate(self.targets): | |
| 357 scope[name] = item[idx] | |
| 358 ctxt.push(**scope) | |
| 359 for event in stream: | |
| 360 yield event | |
| 361 ctxt.pop() | |
| 362 | |
| 363 def __repr__(self): | |
| 364 return '<%s "%s in %s">' % (self.__class__.__name__, | |
| 365 ', '.join(self.targets), self.expr.source) | |
| 366 | |
| 367 | |
| 368 class IfDirective(Directive): | |
| 369 """Implementation of the `py:if` template directive. | |
| 370 | |
| 371 >>> ctxt = Context(foo=True, bar='Hello') | |
| 372 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 373 ... <b py:if="foo">${bar}</b> | |
| 374 ... </div>''') | |
| 375 >>> print tmpl.generate(ctxt) | |
| 376 <div> | |
| 377 <b>Hello</b> | |
| 378 </div> | |
| 379 """ | |
| 380 def __call__(self, stream, ctxt): | |
| 381 if self.expr.evaluate(ctxt): | |
| 382 return stream | |
| 383 return [] | |
| 384 | |
| 385 | |
| 386 class MatchDirective(Directive): | |
| 387 """Implementation of the `py:match` template directive. | |
|
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388 |
| 1 | 389 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> |
|
17
ad63ad459524
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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390 ... <span py:match="greeting"> |
| 1 | 391 ... Hello ${select('@name')} |
| 392 ... </span> | |
| 393 ... <greeting name="Dude" /> | |
| 394 ... </div>''') | |
|
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395 >>> print tmpl.generate() |
| 1 | 396 <div> |
| 397 <span> | |
| 398 Hello Dude | |
| 399 </span> | |
| 400 </div> | |
|
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401 |
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402 A match template can produce the same kind of element that it matched |
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403 without entering an infinite recursion: |
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404 |
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405 >>> tmpl = Template('''<doc xmlns:py="http://purl.org/kid/ns#"> |
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406 ... <elem py:match="elem"> |
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407 ... <div class="elem">${select('*/text()')}</div> |
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408 ... </elem> |
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409 ... <elem>Hey Joe</elem> |
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410 ... </doc>''') |
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411 >>> print tmpl.generate() |
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412 <doc> |
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413 <elem> |
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414 <div class="elem">Hey Joe</div> |
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415 </elem> |
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416 </doc> |
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417 |
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418 Match directives are applied recursively, meaning that they are also |
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419 applied to any content they may have produced themselves: |
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420 |
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421 >>> tmpl = Template('''<doc xmlns:py="http://purl.org/kid/ns#"> |
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422 ... <elem py:match="elem"> |
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423 ... <div class="elem"> |
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424 ... ${select('*/*')} |
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425 ... </div> |
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426 ... </elem> |
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427 ... <elem> |
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428 ... <subelem> |
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429 ... <elem/> |
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430 ... </subelem> |
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431 ... </elem> |
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432 ... </doc>''') |
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433 >>> print tmpl.generate() |
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434 <doc> |
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435 <elem> |
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436 <div class="elem"> |
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437 <subelem> |
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438 <elem> |
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439 <div class="elem"> |
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440 </div> |
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441 </elem> |
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442 </subelem> |
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443 </div> |
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444 </elem> |
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445 </doc> |
| 1 | 446 """ |
| 447 __slots__ = ['path', 'stream'] | |
| 448 | |
| 449 def __init__(self, template, value, pos): | |
| 450 Directive.__init__(self, template, None, pos) | |
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451 self.path = Path(value) |
| 1 | 452 self.stream = [] |
| 453 | |
| 454 def __call__(self, stream, ctxt): | |
| 455 self.stream = list(stream) | |
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456 ctxt._match_templates.append((self.path.test(), self.path, self.stream)) |
| 1 | 457 return [] |
| 458 | |
| 459 def __repr__(self): | |
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460 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
| 1 | 461 |
| 462 | |
| 463 class ReplaceDirective(Directive): | |
| 464 """Implementation of the `py:replace` template directive. | |
| 465 | |
| 466 >>> ctxt = Context(bar='Bye') | |
| 467 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 468 ... <span py:replace="bar">Hello</span> | |
| 469 ... </div>''') | |
| 470 >>> print tmpl.generate(ctxt) | |
| 471 <div> | |
| 472 Bye | |
| 473 </div> | |
| 474 | |
| 475 This directive is equivalent to `py:content` combined with `py:strip`, | |
| 476 providing a less verbose way to achieve the same effect: | |
| 477 | |
| 478 >>> ctxt = Context(bar='Bye') | |
| 479 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 480 ... <span py:content="bar" py:strip="">Hello</span> | |
| 481 ... </div>''') | |
| 482 >>> print tmpl.generate(ctxt) | |
| 483 <div> | |
| 484 Bye | |
| 485 </div> | |
| 486 """ | |
| 487 def __call__(self, stream, ctxt): | |
| 488 kind, data, pos = stream.next() | |
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489 yield Template.EXPR, self.expr, pos |
| 1 | 490 |
| 491 | |
| 492 class StripDirective(Directive): | |
| 493 """Implementation of the `py:strip` template directive. | |
| 494 | |
| 495 When the value of the `py:strip` attribute evaluates to `True`, the element | |
| 496 is stripped from the output | |
| 497 | |
| 498 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 499 ... <div py:strip="True"><b>foo</b></div> | |
| 500 ... </div>''') | |
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501 >>> print tmpl.generate() |
| 1 | 502 <div> |
| 503 <b>foo</b> | |
| 504 </div> | |
| 505 | |
| 506 On the other hand, when the attribute evaluates to `False`, the element is | |
| 507 not stripped: | |
| 508 | |
| 509 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 510 ... <div py:strip="False"><b>foo</b></div> | |
| 511 ... </div>''') | |
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512 >>> print tmpl.generate() |
| 1 | 513 <div> |
| 514 <div><b>foo</b></div> | |
| 515 </div> | |
| 516 | |
| 517 Leaving the attribute value empty is equivalent to a truth value: | |
| 518 | |
| 519 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 520 ... <div py:strip=""><b>foo</b></div> | |
| 521 ... </div>''') | |
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522 >>> print tmpl.generate() |
| 1 | 523 <div> |
| 524 <b>foo</b> | |
| 525 </div> | |
| 526 | |
| 527 This directive is particulary interesting for named template functions or | |
| 528 match templates that do not generate a top-level element: | |
| 529 | |
| 530 >>> tmpl = Template('''<div xmlns:py="http://purl.org/kid/ns#"> | |
| 531 ... <div py:def="echo(what)" py:strip=""> | |
| 532 ... <b>${what}</b> | |
| 533 ... </div> | |
| 534 ... ${echo('foo')} | |
| 535 ... </div>''') | |
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536 >>> print tmpl.generate() |
| 1 | 537 <div> |
| 538 <b>foo</b> | |
| 539 </div> | |
| 540 """ | |
| 541 def __call__(self, stream, ctxt): | |
| 542 if self.expr: | |
| 543 strip = self.expr.evaluate(ctxt) | |
| 544 else: | |
| 545 strip = True | |
| 546 if strip: | |
| 547 stream.next() # skip start tag | |
| 548 previous = stream.next() | |
| 549 for event in stream: | |
| 550 yield previous | |
| 551 previous = event | |
| 552 else: | |
| 553 for event in stream: | |
| 554 yield event | |
| 555 | |
| 556 | |
| 557 class Template(object): | |
| 558 """Can parse a template and transform it into the corresponding output | |
| 559 based on context data. | |
| 560 """ | |
| 561 NAMESPACE = 'http://purl.org/kid/ns#' | |
| 562 | |
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563 EXPR = StreamEventKind('EXPR') # an expression |
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564 SUB = StreamEventKind('SUB') # a "subprogram" |
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565 |
| 1 | 566 directives = [('def', DefDirective), |
| 567 ('match', MatchDirective), | |
| 568 ('for', ForDirective), | |
| 569 ('if', IfDirective), | |
| 570 ('replace', ReplaceDirective), | |
| 571 ('content', ContentDirective), | |
| 572 ('attrs', AttrsDirective), | |
| 573 ('strip', StripDirective)] | |
| 574 _dir_by_name = dict(directives) | |
| 575 _dir_order = [directive[1] for directive in directives] | |
| 576 | |
| 577 def __init__(self, source, filename=None): | |
| 578 """Initialize a template from either a string or a file-like object.""" | |
| 579 if isinstance(source, basestring): | |
| 580 self.source = StringIO(source) | |
| 581 else: | |
| 582 self.source = source | |
| 583 self.filename = filename or '<string>' | |
| 584 | |
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585 self.filters = [self._eval, self._match] |
| 1 | 586 self.parse() |
| 587 | |
| 588 def __repr__(self): | |
| 589 return '<%s "%s">' % (self.__class__.__name__, | |
| 590 os.path.basename(self.filename)) | |
| 591 | |
| 592 def parse(self): | |
| 593 """Parse the template. | |
| 594 | |
| 595 The parsing stage parses the XML template and constructs a list of | |
| 596 directives that will be executed in the render stage. The input is | |
| 597 split up into literal output (markup that does not depend on the | |
| 598 context data) and actual directives (commands or variable | |
| 599 substitution). | |
| 600 """ | |
| 601 stream = [] # list of events of the "compiled" template | |
| 602 dirmap = {} # temporary mapping of directives to elements | |
| 603 ns_prefix = {} | |
| 604 depth = 0 | |
| 605 | |
| 606 for kind, data, pos in XMLParser(self.source): | |
| 607 | |
| 608 if kind is Stream.START_NS: | |
| 609 # Strip out the namespace declaration for template directives | |
| 610 prefix, uri = data | |
| 611 if uri == self.NAMESPACE: | |
| 612 ns_prefix[prefix] = uri | |
| 613 else: | |
| 614 stream.append((kind, data, pos)) | |
| 615 | |
| 616 elif kind is Stream.END_NS: | |
| 617 if data in ns_prefix: | |
| 618 del ns_prefix[data] | |
| 619 else: | |
| 620 stream.append((kind, data, pos)) | |
| 621 | |
| 622 elif kind is Stream.START: | |
| 623 # Record any directive attributes in start tags | |
| 624 tag, attrib = data | |
| 625 directives = [] | |
| 626 new_attrib = [] | |
| 627 for name, value in attrib: | |
| 628 if name.namespace == self.NAMESPACE: | |
| 629 cls = self._dir_by_name.get(name.localname) | |
| 630 if cls is None: | |
| 631 raise BadDirectiveError(name, self.filename, pos[0]) | |
| 632 else: | |
| 633 directives.append(cls(self, value, pos)) | |
| 634 else: | |
| 635 value = list(self._interpolate(value, *pos)) | |
| 636 new_attrib.append((name, value)) | |
| 637 if directives: | |
| 638 directives.sort(lambda a, b: cmp(self._dir_order.index(a.__class__), | |
| 639 self._dir_order.index(b.__class__))) | |
| 640 dirmap[(depth, tag)] = (directives, len(stream)) | |
| 641 | |
| 642 stream.append((kind, (tag, Attributes(new_attrib)), pos)) | |
| 643 depth += 1 | |
| 644 | |
| 645 elif kind is Stream.END: | |
| 646 depth -= 1 | |
| 647 stream.append((kind, data, pos)) | |
| 648 | |
| 649 # If there have have directive attributes with the corresponding | |
| 650 # start tag, move the events inbetween into a "subprogram" | |
| 651 if (depth, data) in dirmap: | |
| 652 directives, start_offset = dirmap.pop((depth, data)) | |
| 653 substream = stream[start_offset:] | |
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654 stream[start_offset:] = [(Template.SUB, |
| 1 | 655 (directives, substream), pos)] |
| 656 | |
| 657 elif kind is Stream.TEXT: | |
| 658 for kind, data, pos in self._interpolate(data, *pos): | |
| 659 stream.append((kind, data, pos)) | |
| 660 | |
| 661 else: | |
| 662 stream.append((kind, data, pos)) | |
| 663 | |
| 664 self.stream = stream | |
| 665 | |
| 666 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}') | |
| 667 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') | |
| 668 | |
| 669 def _interpolate(cls, text, lineno=-1, offset=-1): | |
| 670 """Parse the given string and extract expressions. | |
| 671 | |
| 672 This method returns a list containing both literal text and `Expression` | |
| 673 objects. | |
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674 |
| 1 | 675 @param text: the text to parse |
| 676 @param lineno: the line number at which the text was found (optional) | |
| 677 @param offset: the column number at which the text starts in the source | |
| 678 (optional) | |
| 679 """ | |
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680 patterns = [Template._FULL_EXPR_RE, Template._SHORT_EXPR_RE] |
| 1 | 681 def _interpolate(text): |
| 682 for idx, group in enumerate(patterns.pop(0).split(text)): | |
| 683 if idx % 2: | |
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684 yield Template.EXPR, Expression(group), (lineno, offset) |
| 1 | 685 elif group: |
| 686 if patterns: | |
| 687 for result in _interpolate(group): | |
| 688 yield result | |
| 689 else: | |
| 690 yield Stream.TEXT, group.replace('$$', '$'), \ | |
| 691 (lineno, offset) | |
| 692 return _interpolate(text) | |
| 693 _interpolate = classmethod(_interpolate) | |
| 694 | |
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695 def generate(self, ctxt=None): |
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696 """Transform the template based on the given context data.""" |
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697 if ctxt is None: |
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698 ctxt = Context() |
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699 if not hasattr(ctxt, '_match_templates'): |
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700 ctxt._match_templates = [] |
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701 |
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702 return Stream(self._flatten(self.stream, ctxt)) |
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703 |
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704 def _eval(self, stream, ctxt=None): |
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705 for kind, data, pos in stream: |
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706 |
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707 if kind is Stream.START: |
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diff
changeset
|
708 # Attributes may still contain expressions in start tags at |
|
ad63ad459524
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
|
709 # this point, so do some evaluation |
|
ad63ad459524
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
|
710 tag, attrib = data |
|
ad63ad459524
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
|
711 new_attrib = [] |
|
ad63ad459524
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
|
712 for name, substream in attrib: |
|
ad63ad459524
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
|
713 if isinstance(substream, basestring): |
|
ad63ad459524
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 value = substream |
|
ad63ad459524
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 else: |
|
ad63ad459524
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 values = [] |
|
ad63ad459524
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 for subkind, subdata, subpos in substream: |
|
ad63ad459524
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 if subkind is Template.EXPR: |
|
ad63ad459524
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
|
719 values.append(subdata.evaluate(ctxt)) |
|
ad63ad459524
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
|
720 else: |
|
ad63ad459524
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 values.append(subdata) |
|
ad63ad459524
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 value = filter(lambda x: x is not None, values) |
|
ad63ad459524
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
|
723 if not value: |
|
ad63ad459524
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
|
724 continue |
|
ad63ad459524
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
|
725 new_attrib.append((name, ''.join(value))) |
|
ad63ad459524
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 yield kind, (tag, Attributes(new_attrib)), pos |
|
ad63ad459524
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 |
|
ad63ad459524
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 elif kind is Template.EXPR: |
|
ad63ad459524
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 result = data.evaluate(ctxt) |
|
ad63ad459524
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 if result is None: |
|
ad63ad459524
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 continue |
|
ad63ad459524
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 |
|
ad63ad459524
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 # First check for a string, otherwise the iterable test below |
|
ad63ad459524
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 # succeeds, and the string will be chopped up into individual |
|
ad63ad459524
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 # characters |
|
ad63ad459524
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 if isinstance(result, basestring): |
|
ad63ad459524
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 yield Stream.TEXT, result, pos |
|
ad63ad459524
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 else: |
|
ad63ad459524
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 # Test if the expression evaluated to an iterable, in which |
|
ad63ad459524
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 # case we yield the individual items |
|
ad63ad459524
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 try: |
|
ad63ad459524
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 yield (Template.SUB, ([], iter(result)), pos) |
|
ad63ad459524
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 except TypeError: |
|
ad63ad459524
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 # Neither a string nor an iterable, so just pass it |
|
ad63ad459524
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 # through |
|
ad63ad459524
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
|
746 yield Stream.TEXT, unicode(result), pos |
|
ad63ad459524
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 |
|
ad63ad459524
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 else: |
|
ad63ad459524
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 yield kind, data, pos |
|
ad63ad459524
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 |
|
ad63ad459524
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 def _flatten(self, stream, ctxt=None, apply_filters=True): |
|
ad63ad459524
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 if apply_filters: |
|
ad63ad459524
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 for filter_ in self.filters: |
|
ad63ad459524
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 stream = filter_(iter(stream), ctxt) |
|
ad63ad459524
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 try: |
|
ad63ad459524
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 for kind, data, pos in stream: |
|
ad63ad459524
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 kind is Template.SUB: |
|
ad63ad459524
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
|
758 # This event is a list of directives and a list of |
|
ad63ad459524
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 # nested events to which those directives should be |
|
ad63ad459524
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 # applied |
|
ad63ad459524
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 directives, substream = data |
|
ad63ad459524
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 directives.reverse() |
|
ad63ad459524
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 for directive in directives: |
|
ad63ad459524
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 substream = directive(iter(substream), ctxt) |
|
ad63ad459524
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 for event in self._flatten(substream, ctxt): |
|
ad63ad459524
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 yield event |
|
ad63ad459524
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 continue |
|
ad63ad459524
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 else: |
|
ad63ad459524
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 yield kind, data, pos |
|
ad63ad459524
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 except SyntaxError, err: |
|
ad63ad459524
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 raise TemplateSyntaxError(err, self.filename, pos[0], |
|
ad63ad459524
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
|
772 pos[1] + (err.offset or 0)) |
|
ad63ad459524
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
|
773 |
|
ad63ad459524
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
|
774 def _match(self, stream, ctxt=None): |
|
ad63ad459524
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
|
775 for kind, data, pos in stream: |
|
ad63ad459524
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 |
|
ad63ad459524
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 # We (currently) only care about start and end events for matching |
|
ad63ad459524
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 # We might care about namespace events in the future, though |
|
ad63ad459524
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 if kind not in (Stream.START, Stream.END): |
|
ad63ad459524
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 yield kind, data, pos |
|
ad63ad459524
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 continue |
|
ad63ad459524
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 |
|
ad63ad459524
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 for idx, (test, path, template) in enumerate(ctxt._match_templates): |
|
ad63ad459524
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 if (kind, data, pos) in template[::len(template)]: |
|
ad63ad459524
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 # This is the event this match template produced itself, so |
|
ad63ad459524
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
|
786 # matching it again would result in an infinite loop |
|
ad63ad459524
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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787 continue |
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ad63ad459524
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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788 |
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ad63ad459524
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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789 result = test(kind, data, pos) |
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ad63ad459524
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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790 |
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ad63ad459524
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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791 if result: |
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ad63ad459524
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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792 # Consume and store all events until an end event |
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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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793 # corresponding to this start event is encountered |
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ad63ad459524
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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794 content = [(kind, data, pos)] |
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ad63ad459524
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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795 depth = 1 |
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ad63ad459524
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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796 while depth > 0: |
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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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797 event = stream.next() |
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ad63ad459524
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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798 if event[0] is Stream.START: |
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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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799 depth += 1 |
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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 elif event[0] is Stream.END: |
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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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801 depth -= 1 |
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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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802 content.append(event) |
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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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803 |
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ad63ad459524
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 # enable the path to keep track of the stream state |
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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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805 test(*event) |
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ad63ad459524
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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806 |
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ad63ad459524
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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807 content = list(self._flatten(content, ctxt, apply_filters=False)) |
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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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808 |
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ad63ad459524
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 def _apply(stream, ctxt): |
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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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810 stream = list(stream) |
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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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811 ctxt.push(select=lambda path: Stream(stream).select(path)) |
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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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812 for event in template: |
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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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813 yield event |
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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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814 ctxt.pop() |
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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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815 |
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ad63ad459524
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 yield (Template.SUB, |
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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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817 ([lambda stream, ctxt: _apply(content, ctxt)], |
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ad63ad459524
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 []), content[0][-1]) |
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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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819 break |
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ad63ad459524
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 else: |
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ad63ad459524
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 yield kind, data, pos |
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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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822 |
| 1 | 823 |
| 824 class TemplateLoader(object): | |
| 825 """Responsible for loading templates from files on the specified search | |
| 826 path. | |
| 827 | |
| 828 >>> import tempfile | |
| 829 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
| 830 >>> os.write(fd, '<p>$var</p>') | |
| 831 11 | |
| 832 >>> os.close(fd) | |
| 833 | |
| 834 The template loader accepts a list of directory paths that are then used | |
| 835 when searching for template files, in the given order: | |
| 836 | |
| 837 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
| 838 | |
| 839 The `load()` method first checks the template cache whether the requested | |
| 840 template has already been loaded. If not, it attempts to locate the | |
| 841 template file, and returns the corresponding `Template` object: | |
| 842 | |
| 843 >>> template = loader.load(os.path.basename(path)) | |
| 844 >>> isinstance(template, Template) | |
| 845 True | |
| 846 | |
| 847 Template instances are cached: requesting a template with the same name | |
| 848 results in the same instance being returned: | |
| 849 | |
| 850 >>> loader.load(os.path.basename(path)) is template | |
| 851 True | |
| 852 """ | |
| 853 def __init__(self, search_path=None, auto_reload=False): | |
| 854 """Create the template laoder. | |
| 855 | |
| 856 @param search_path: a list of absolute path names that should be | |
| 857 searched for template files | |
| 858 @param auto_reload: whether to check the last modification time of | |
| 859 template files, and reload them if they have changed | |
| 860 """ | |
| 861 self.search_path = search_path | |
| 862 if self.search_path is None: | |
| 863 self.search_path = [] | |
| 864 self.auto_reload = auto_reload | |
| 865 self._cache = {} | |
| 866 self._mtime = {} | |
| 867 | |
| 868 def load(self, filename): | |
| 869 """Load the template with the given name. | |
| 870 | |
| 871 This method searches the search path trying to locate a template | |
| 872 matching the given name. If no such template is found, a | |
| 873 `TemplateNotFound` exception is raised. Otherwise, a `Template` object | |
| 874 representing the requested template is returned. | |
| 875 | |
| 876 Template searches are cached to avoid having to parse the same template | |
| 877 file more than once. Thus, subsequent calls of this method with the | |
| 878 same template file name will return the same `Template` object. | |
| 879 | |
| 880 @param filename: the relative path of the template file to load | |
| 881 """ | |
| 882 filename = os.path.normpath(filename) | |
| 883 try: | |
| 884 tmpl = self._cache[filename] | |
| 885 if not self.auto_reload or \ | |
| 886 os.path.getmtime(tmpl.filename) == self._mtime[filename]: | |
| 887 return tmpl | |
| 888 except KeyError: | |
| 889 pass | |
| 890 for dirname in self.search_path: | |
| 891 filepath = os.path.join(dirname, filename) | |
| 892 try: | |
| 893 fileobj = file(filepath, 'rt') | |
| 894 try: | |
| 895 tmpl = Template(fileobj, filename=filepath) | |
|
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ad63ad459524
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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896 tmpl.filters.append(IncludeFilter(self)) |
| 1 | 897 finally: |
| 898 fileobj.close() | |
| 899 self._cache[filename] = tmpl | |
| 900 self._mtime[filename] = os.path.getmtime(filepath) | |
| 901 return tmpl | |
| 902 except IOError: | |
| 903 continue | |
| 904 raise TemplateNotFound(filename, self.search_path) |