Mercurial > genshi > mirror
annotate markup/template.py @ 74:d54b5fd60b52 trunk
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
| author | cmlenz |
|---|---|
| date | Wed, 12 Jul 2006 19:45:13 +0000 |
| parents | 1da51d718391 |
| children | 3722696d0343 |
| rev | line source |
|---|---|
| 1 | 1 # -*- coding: utf-8 -*- |
| 2 # | |
|
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Switch copyright to Edgewall and URLs to markup.edgewall.org.
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3 # Copyright (C) 2006 Edgewall Software |
| 1 | 4 # All rights reserved. |
| 5 # | |
| 6 # This software is licensed as described in the file COPYING, which | |
| 7 # you should have received as part of this distribution. The terms | |
|
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8 # are also available at http://markup.edgewall.org/wiki/License. |
| 1 | 9 # |
| 10 # This software consists of voluntary contributions made by many | |
| 11 # individuals. For the exact contribution history, see the revision | |
|
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12 # history and logs, available at http://markup.edgewall.org/log/. |
| 1 | 13 |
| 14 """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 list comprehensions and generator expressions in expressions | |
| 35 | |
| 36 Random thoughts: | |
| 37 * Is there any need to support py:extends and/or py:layout? | |
| 38 * Could we generate byte code from expressions? | |
| 39 """ | |
| 40 | |
|
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41 try: |
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42 from collections import deque |
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43 except ImportError: |
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44 class deque(list): |
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45 def appendleft(self, x): self.insert(0, x) |
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46 def popleft(self): return self.pop(0) |
| 1 | 47 import compiler |
| 48 import os | |
|
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* Include paths are now interpreted relative to the path of the including template. Closes #3.
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49 import posixpath |
| 1 | 50 import re |
| 51 from StringIO import StringIO | |
| 52 | |
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53 from markup.core import Attributes, Namespace, Stream, StreamEventKind |
| 69 | 54 from markup.core import START, END, START_NS, END_NS, TEXT |
| 1 | 55 from markup.eval import Expression |
| 69 | 56 from markup.input import XMLParser |
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57 from markup.path import Path |
| 1 | 58 |
| 59 __all__ = ['Context', 'BadDirectiveError', 'TemplateError', | |
| 60 'TemplateSyntaxError', 'TemplateNotFound', 'Template', | |
| 61 'TemplateLoader'] | |
| 62 | |
| 63 | |
| 64 class TemplateError(Exception): | |
| 65 """Base exception class for errors related to template processing.""" | |
| 66 | |
| 67 | |
| 68 class TemplateSyntaxError(TemplateError): | |
| 69 """Exception raised when an expression in a template causes a Python syntax | |
| 70 error.""" | |
| 71 | |
| 72 def __init__(self, message, filename='<string>', lineno=-1, offset=-1): | |
| 73 if isinstance(message, SyntaxError) and message.lineno is not None: | |
| 74 message = str(message).replace(' (line %d)' % message.lineno, '') | |
| 75 TemplateError.__init__(self, message) | |
| 76 self.filename = filename | |
| 77 self.lineno = lineno | |
| 78 self.offset = offset | |
| 79 | |
| 80 | |
| 81 class BadDirectiveError(TemplateSyntaxError): | |
| 82 """Exception raised when an unknown directive is encountered when parsing | |
| 83 a template. | |
| 84 | |
| 85 An unknown directive is any attribute using the namespace for directives, | |
| 86 with a local name that doesn't match any registered directive. | |
| 87 """ | |
| 88 | |
| 89 def __init__(self, name, filename='<string>', lineno=-1): | |
| 90 TemplateSyntaxError.__init__(self, 'Bad directive "%s"' % name.localname, | |
| 91 filename, lineno) | |
| 92 | |
| 93 | |
| 94 class TemplateNotFound(TemplateError): | |
| 95 """Exception raised when a specific template file could not be found.""" | |
| 96 | |
| 97 def __init__(self, name, search_path): | |
| 98 TemplateError.__init__(self, 'Template "%s" not found' % name) | |
| 99 self.search_path = search_path | |
| 100 | |
| 101 | |
| 102 class Context(object): | |
| 103 """A container for template input data. | |
| 104 | |
| 105 A context provides a stack of scopes. Template directives such as loops can | |
| 106 push a new scope on the stack with data that should only be available | |
| 107 inside the loop. When the loop terminates, that scope can get popped off | |
| 108 the stack again. | |
| 109 | |
| 110 >>> ctxt = Context(one='foo', other=1) | |
| 111 >>> ctxt.get('one') | |
| 112 'foo' | |
| 113 >>> ctxt.get('other') | |
| 114 1 | |
| 115 >>> ctxt.push(one='frost') | |
| 116 >>> ctxt.get('one') | |
| 117 'frost' | |
| 118 >>> ctxt.get('other') | |
| 119 1 | |
| 120 >>> ctxt.pop() | |
| 121 >>> ctxt.get('one') | |
| 122 'foo' | |
| 123 """ | |
| 124 | |
| 125 def __init__(self, **data): | |
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126 self.frames = deque([data]) |
| 1 | 127 |
| 128 def __repr__(self): | |
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129 return repr(self.frames) |
| 1 | 130 |
| 131 def __setitem__(self, key, value): | |
| 132 """Set a variable in the current context.""" | |
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133 self.frames[0][key] = value |
| 1 | 134 |
| 135 def get(self, key): | |
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136 """Get a variable's value, starting at the current context frame and |
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137 going upward. |
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138 """ |
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139 for frame in self.frames: |
| 1 | 140 if key in frame: |
| 141 return frame[key] | |
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142 __getitem__ = get |
| 1 | 143 |
| 144 def push(self, **data): | |
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145 """Push a new context frame on the stack.""" |
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146 self.frames.appendleft(data) |
| 1 | 147 |
| 148 def pop(self): | |
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149 """Pop the top-most context frame from the stack. |
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150 |
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151 If the stack is empty, an `AssertionError` is raised. |
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152 """ |
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153 assert self.frames, 'Pop from empty context stack' |
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154 self.frames.popleft() |
| 1 | 155 |
| 156 | |
| 157 class Directive(object): | |
| 158 """Abstract base class for template directives. | |
| 159 | |
| 54 | 160 A directive is basically a callable that takes three positional arguments: |
| 161 `ctxt` is the template data context, `stream` is an iterable over the | |
| 162 events that the directive applies to, and `directives` is is a list of | |
| 163 other directives on the same stream that need to be applied. | |
| 1 | 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 | |
| 31 | 168 this base class that can be instantiated with the value of the directive |
| 169 attribute as parameter. | |
| 1 | 170 |
| 171 Anonymous directives are simply functions conforming to the protocol | |
| 172 described above, and can only be applied programmatically (for example by | |
| 173 template filters). | |
| 174 """ | |
| 175 __slots__ = ['expr'] | |
| 176 | |
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177 def __init__(self, value): |
| 1 | 178 self.expr = value and Expression(value) or None |
| 179 | |
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180 def __call__(self, stream, ctxt, directives): |
| 1 | 181 raise NotImplementedError |
| 182 | |
| 183 def __repr__(self): | |
| 184 expr = '' | |
| 185 if self.expr is not None: | |
| 186 expr = ' "%s"' % self.expr.source | |
| 187 return '<%s%s>' % (self.__class__.__name__, expr) | |
| 188 | |
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189 def _apply_directives(self, stream, ctxt, directives): |
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190 if directives: |
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191 stream = directives[0](iter(stream), ctxt, directives[1:]) |
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192 return stream |
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193 |
| 1 | 194 |
| 195 class AttrsDirective(Directive): | |
| 196 """Implementation of the `py:attrs` template directive. | |
| 197 | |
| 198 The value of the `py:attrs` attribute should be a dictionary. The keys and | |
| 199 values of that dictionary will be added as attributes to the element: | |
| 200 | |
| 201 >>> ctxt = Context(foo={'class': 'collapse'}) | |
| 61 | 202 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 203 ... <li py:attrs="foo">Bar</li> |
| 204 ... </ul>''') | |
| 205 >>> print tmpl.generate(ctxt) | |
| 206 <ul> | |
| 207 <li class="collapse">Bar</li> | |
| 208 </ul> | |
| 209 | |
| 210 If the value evaluates to `None` (or any other non-truth value), no | |
| 211 attributes are added: | |
| 212 | |
| 213 >>> ctxt = Context(foo=None) | |
| 214 >>> print tmpl.generate(ctxt) | |
| 215 <ul> | |
| 216 <li>Bar</li> | |
| 217 </ul> | |
| 218 """ | |
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219 __slots__ = [] |
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220 |
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221 def __call__(self, stream, ctxt, directives): |
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222 def _generate(): |
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223 kind, (tag, attrib), pos = stream.next() |
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224 attrs = self.expr.evaluate(ctxt) |
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225 if attrs: |
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226 attrib = Attributes(attrib[:]) |
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227 if not isinstance(attrs, list): # assume it's a dict |
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228 attrs = attrs.items() |
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229 for name, value in attrs: |
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230 if value is None: |
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231 attrib.remove(name) |
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232 else: |
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233 attrib.set(name, unicode(value).strip()) |
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234 yield kind, (tag, attrib), pos |
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235 for event in stream: |
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236 yield event |
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237 return self._apply_directives(_generate(), ctxt, directives) |
| 1 | 238 |
| 239 | |
| 240 class ContentDirective(Directive): | |
| 241 """Implementation of the `py:content` template directive. | |
| 242 | |
| 243 This directive replaces the content of the element with the result of | |
| 244 evaluating the value of the `py:content` attribute: | |
| 245 | |
| 246 >>> ctxt = Context(bar='Bye') | |
| 61 | 247 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 248 ... <li py:content="bar">Hello</li> |
| 249 ... </ul>''') | |
| 250 >>> print tmpl.generate(ctxt) | |
| 251 <ul> | |
| 252 <li>Bye</li> | |
| 253 </ul> | |
| 254 """ | |
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255 __slots__ = [] |
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256 |
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257 def __call__(self, stream, ctxt, directives): |
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258 def _generate(): |
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259 kind, data, pos = stream.next() |
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260 if kind is Stream.START: |
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261 yield kind, data, pos # emit start tag |
| 69 | 262 yield EXPR, self.expr, pos |
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263 previous = stream.next() |
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264 for event in stream: |
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265 previous = event |
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266 if previous is not None: |
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267 yield previous |
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268 return self._apply_directives(_generate(), ctxt, directives) |
| 1 | 269 |
| 270 | |
| 271 class DefDirective(Directive): | |
| 272 """Implementation of the `py:def` template directive. | |
| 273 | |
| 274 This directive can be used to create "Named Template Functions", which | |
| 275 are template snippets that are not actually output during normal | |
| 276 processing, but rather can be expanded from expressions in other places | |
| 277 in the template. | |
| 278 | |
| 279 A named template function can be used just like a normal Python function | |
| 280 from template expressions: | |
| 281 | |
| 282 >>> ctxt = Context(bar='Bye') | |
| 61 | 283 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 284 ... <p py:def="echo(greeting, name='world')" class="message"> |
| 285 ... ${greeting}, ${name}! | |
| 286 ... </p> | |
| 287 ... ${echo('hi', name='you')} | |
| 288 ... </div>''') | |
| 289 >>> print tmpl.generate(ctxt) | |
| 290 <div> | |
| 291 <p class="message"> | |
| 292 hi, you! | |
| 293 </p> | |
| 294 </div> | |
| 295 | |
| 296 >>> ctxt = Context(bar='Bye') | |
| 61 | 297 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 298 ... <p py:def="echo(greeting, name='world')" class="message"> |
| 299 ... ${greeting}, ${name}! | |
| 300 ... </p> | |
| 301 ... <div py:replace="echo('hello')"></div> | |
| 302 ... </div>''') | |
| 303 >>> print tmpl.generate(ctxt) | |
| 304 <div> | |
| 305 <p class="message"> | |
| 306 hello, world! | |
| 307 </p> | |
| 308 </div> | |
| 309 """ | |
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310 __slots__ = ['name', 'args', 'defaults', 'stream', 'directives'] |
| 1 | 311 |
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312 ATTRIBUTE = 'function' |
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313 |
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314 def __init__(self, args): |
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315 Directive.__init__(self, None) |
| 1 | 316 ast = compiler.parse(args, 'eval').node |
| 317 self.args = [] | |
| 318 self.defaults = {} | |
| 319 if isinstance(ast, compiler.ast.CallFunc): | |
| 320 self.name = ast.node.name | |
| 321 for arg in ast.args: | |
| 322 if isinstance(arg, compiler.ast.Keyword): | |
| 323 self.args.append(arg.name) | |
| 324 self.defaults[arg.name] = arg.expr.value | |
| 325 else: | |
| 326 self.args.append(arg.name) | |
| 327 else: | |
| 328 self.name = ast.name | |
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329 self.stream, self.directives = [], [] |
| 1 | 330 |
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331 def __call__(self, stream, ctxt, directives): |
| 1 | 332 self.stream = list(stream) |
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333 self.directives = directives |
| 1 | 334 ctxt[self.name] = lambda *args, **kwargs: self._exec(ctxt, *args, |
| 335 **kwargs) | |
| 336 return [] | |
| 337 | |
| 338 def _exec(self, ctxt, *args, **kwargs): | |
| 339 scope = {} | |
| 340 args = list(args) # make mutable | |
| 341 for name in self.args: | |
| 342 if args: | |
| 343 scope[name] = args.pop(0) | |
| 344 else: | |
| 345 scope[name] = kwargs.pop(name, self.defaults.get(name)) | |
| 346 ctxt.push(**scope) | |
| 69 | 347 for event in self._apply_directives(self.stream, ctxt, self.directives): |
| 1 | 348 yield event |
| 349 ctxt.pop() | |
| 350 | |
| 351 | |
| 352 class ForDirective(Directive): | |
| 31 | 353 """Implementation of the `py:for` template directive for repeating an |
| 354 element based on an iterable in the context data. | |
| 1 | 355 |
| 356 >>> ctxt = Context(items=[1, 2, 3]) | |
| 61 | 357 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
| 1 | 358 ... <li py:for="item in items">${item}</li> |
| 359 ... </ul>''') | |
| 360 >>> print tmpl.generate(ctxt) | |
| 361 <ul> | |
| 362 <li>1</li><li>2</li><li>3</li> | |
| 363 </ul> | |
| 364 """ | |
| 365 __slots__ = ['targets'] | |
| 366 | |
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367 ATTRIBUTE = 'each' |
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368 |
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369 def __init__(self, value): |
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370 targets, value = value.split(' in ', 1) |
| 1 | 371 self.targets = [str(name.strip()) for name in targets.split(',')] |
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372 Directive.__init__(self, value) |
| 1 | 373 |
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374 def __call__(self, stream, ctxt, directives): |
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375 iterable = self.expr.evaluate(ctxt) |
| 1 | 376 if iterable is not None: |
| 377 stream = list(stream) | |
| 378 for item in iter(iterable): | |
| 379 if len(self.targets) == 1: | |
| 380 item = [item] | |
| 381 scope = {} | |
| 382 for idx, name in enumerate(self.targets): | |
| 383 scope[name] = item[idx] | |
| 384 ctxt.push(**scope) | |
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385 for event in self._apply_directives(stream, ctxt, directives): |
| 1 | 386 yield event |
| 387 ctxt.pop() | |
| 388 | |
| 389 def __repr__(self): | |
| 390 return '<%s "%s in %s">' % (self.__class__.__name__, | |
| 391 ', '.join(self.targets), self.expr.source) | |
| 392 | |
| 393 | |
| 394 class IfDirective(Directive): | |
| 31 | 395 """Implementation of the `py:if` template directive for conditionally |
| 396 excluding elements from being output. | |
| 1 | 397 |
| 398 >>> ctxt = Context(foo=True, bar='Hello') | |
| 61 | 399 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 400 ... <b py:if="foo">${bar}</b> |
| 401 ... </div>''') | |
| 402 >>> print tmpl.generate(ctxt) | |
| 403 <div> | |
| 404 <b>Hello</b> | |
| 405 </div> | |
| 406 """ | |
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407 __slots__ = [] |
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408 |
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409 ATTRIBUTE = 'test' |
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410 |
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411 def __call__(self, stream, ctxt, directives): |
| 1 | 412 if self.expr.evaluate(ctxt): |
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413 return self._apply_directives(stream, ctxt, directives) |
| 1 | 414 return [] |
| 415 | |
| 416 | |
| 417 class MatchDirective(Directive): | |
| 418 """Implementation of the `py:match` template directive. | |
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419 |
| 61 | 420 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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421 ... <span py:match="greeting"> |
| 1 | 422 ... Hello ${select('@name')} |
| 423 ... </span> | |
| 424 ... <greeting name="Dude" /> | |
| 425 ... </div>''') | |
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426 >>> print tmpl.generate() |
| 1 | 427 <div> |
| 428 <span> | |
| 429 Hello Dude | |
| 430 </span> | |
| 431 </div> | |
| 432 """ | |
| 433 __slots__ = ['path', 'stream'] | |
| 434 | |
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435 ATTRIBUTE = 'path' |
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436 |
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437 def __init__(self, value): |
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438 Directive.__init__(self, None) |
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439 self.path = Path(value) |
| 1 | 440 self.stream = [] |
| 441 | |
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442 def __call__(self, stream, ctxt, directives): |
| 1 | 443 self.stream = list(stream) |
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444 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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445 self.path, self.stream, directives)) |
| 1 | 446 return [] |
| 447 | |
| 448 def __repr__(self): | |
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449 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
| 1 | 450 |
| 451 | |
| 452 class ReplaceDirective(Directive): | |
| 453 """Implementation of the `py:replace` template directive. | |
| 454 | |
| 31 | 455 This directive replaces the element with the result of evaluating the |
| 456 value of the `py:replace` attribute: | |
| 457 | |
| 1 | 458 >>> ctxt = Context(bar='Bye') |
| 61 | 459 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 460 ... <span py:replace="bar">Hello</span> |
| 461 ... </div>''') | |
| 462 >>> print tmpl.generate(ctxt) | |
| 463 <div> | |
| 464 Bye | |
| 465 </div> | |
| 466 | |
| 467 This directive is equivalent to `py:content` combined with `py:strip`, | |
| 468 providing a less verbose way to achieve the same effect: | |
| 469 | |
| 470 >>> ctxt = Context(bar='Bye') | |
| 61 | 471 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 472 ... <span py:content="bar" py:strip="">Hello</span> |
| 473 ... </div>''') | |
| 474 >>> print tmpl.generate(ctxt) | |
| 475 <div> | |
| 476 Bye | |
| 477 </div> | |
| 478 """ | |
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479 __slots__ = [] |
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480 |
| 54 | 481 def __call__(self, stream, ctxt, directives): |
| 1 | 482 kind, data, pos = stream.next() |
| 69 | 483 yield EXPR, self.expr, pos |
| 1 | 484 |
| 485 | |
| 486 class StripDirective(Directive): | |
| 487 """Implementation of the `py:strip` template directive. | |
| 488 | |
| 489 When the value of the `py:strip` attribute evaluates to `True`, the element | |
| 490 is stripped from the output | |
| 491 | |
| 61 | 492 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 493 ... <div py:strip="True"><b>foo</b></div> |
| 494 ... </div>''') | |
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495 >>> print tmpl.generate() |
| 1 | 496 <div> |
| 497 <b>foo</b> | |
| 498 </div> | |
| 499 | |
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500 Leaving the attribute value empty is equivalent to a truth value. |
| 1 | 501 |
| 502 This directive is particulary interesting for named template functions or | |
| 503 match templates that do not generate a top-level element: | |
| 504 | |
| 61 | 505 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
| 1 | 506 ... <div py:def="echo(what)" py:strip=""> |
| 507 ... <b>${what}</b> | |
| 508 ... </div> | |
| 509 ... ${echo('foo')} | |
| 510 ... </div>''') | |
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511 >>> print tmpl.generate() |
| 1 | 512 <div> |
| 513 <b>foo</b> | |
| 514 </div> | |
| 515 """ | |
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516 __slots__ = [] |
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517 |
| 54 | 518 def __call__(self, stream, ctxt, directives): |
| 1 | 519 if self.expr: |
| 520 strip = self.expr.evaluate(ctxt) | |
| 521 else: | |
| 522 strip = True | |
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523 stream = self._apply_directives(stream, ctxt, directives) |
| 1 | 524 if strip: |
| 525 stream.next() # skip start tag | |
| 526 previous = stream.next() | |
| 527 for event in stream: | |
| 528 yield previous | |
| 529 previous = event | |
| 530 else: | |
| 531 for event in stream: | |
| 532 yield event | |
| 533 | |
| 534 | |
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535 class ChooseDirective(Directive): |
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536 """Implementation of the `py:choose` directive for conditionally selecting |
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537 one of several body elements to display. |
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538 |
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539 If the `py:choose` expression is empty the expressions of nested `py:when` |
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540 directives are tested for truth. The first true `py:when` body is output. |
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541 If no `py:when` directive is matched then the fallback directive |
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542 `py:otherwise` will be used. |
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543 |
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544 >>> ctxt = Context() |
| 61 | 545 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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546 ... py:choose=""> |
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547 ... <span py:when="0 == 1">0</span> |
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548 ... <span py:when="1 == 1">1</span> |
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549 ... <span py:otherwise="">2</span> |
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550 ... </div>''') |
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551 >>> print tmpl.generate(ctxt) |
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552 <div> |
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553 <span>1</span> |
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554 </div> |
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555 |
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556 If the `py:choose` directive contains an expression, the nested `py:when` |
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557 directives are tested for equality to the `py:choose` expression: |
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558 |
| 61 | 559 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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560 ... py:choose="2"> |
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561 ... <span py:when="1">1</span> |
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562 ... <span py:when="2">2</span> |
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563 ... </div>''') |
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564 >>> print tmpl.generate(ctxt) |
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565 <div> |
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566 <span>2</span> |
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567 </div> |
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568 |
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569 Behavior is undefined if a `py:choose` block contains content outside a |
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570 `py:when` or `py:otherwise` block. Behavior is also undefined if a |
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571 `py:otherwise` occurs before `py:when` blocks. |
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572 """ |
|
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573 __slots__ = ['matched', 'value'] |
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574 |
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575 ATTRIBUTE = 'test' |
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576 |
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577 def __call__(self, stream, ctxt, directives): |
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578 if self.expr: |
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579 self.value = self.expr.evaluate(ctxt) |
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580 self.matched = False |
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581 ctxt.push(_choose=self) |
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582 for event in self._apply_directives(stream, ctxt, directives): |
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583 yield event |
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584 ctxt.pop() |
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585 |
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586 |
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587 class WhenDirective(Directive): |
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588 """Implementation of the `py:when` directive for nesting in a parent with |
|
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589 the `py:choose` directive. |
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590 |
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591 See the documentation of `py:choose` for usage. |
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592 """ |
|
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593 |
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594 ATTRIBUTE = 'test' |
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595 |
| 54 | 596 def __call__(self, stream, ctxt, directives): |
|
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597 choose = ctxt['_choose'] |
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598 if choose.matched: |
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599 return [] |
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600 value = self.expr.evaluate(ctxt) |
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601 try: |
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602 if value == choose.value: |
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603 choose.matched = True |
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604 return self._apply_directives(stream, ctxt, directives) |
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605 except AttributeError: |
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606 if value: |
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607 choose.matched = True |
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608 return self._apply_directives(stream, ctxt, directives) |
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609 return [] |
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610 |
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611 |
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612 class OtherwiseDirective(Directive): |
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613 """Implementation of the `py:otherwise` directive for nesting in a parent |
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614 with the `py:choose` directive. |
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615 |
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616 See the documentation of `py:choose` for usage. |
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617 """ |
| 54 | 618 def __call__(self, stream, ctxt, directives): |
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619 choose = ctxt['_choose'] |
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620 if choose.matched: |
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621 return [] |
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622 choose.matched = True |
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623 return self._apply_directives(stream, ctxt, directives) |
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624 |
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625 |
| 1 | 626 class Template(object): |
| 627 """Can parse a template and transform it into the corresponding output | |
| 628 based on context data. | |
| 629 """ | |
| 61 | 630 NAMESPACE = Namespace('http://markup.edgewall.org/') |
| 1 | 631 |
|
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632 EXPR = StreamEventKind('EXPR') # an expression |
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633 SUB = StreamEventKind('SUB') # a "subprogram" |
|
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634 |
| 1 | 635 directives = [('def', DefDirective), |
| 636 ('match', MatchDirective), | |
| 637 ('for', ForDirective), | |
| 638 ('if', IfDirective), | |
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639 ('when', WhenDirective), |
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640 ('otherwise', OtherwiseDirective), |
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641 ('choose', ChooseDirective), |
| 1 | 642 ('replace', ReplaceDirective), |
| 643 ('content', ContentDirective), | |
| 644 ('attrs', AttrsDirective), | |
|
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645 ('strip', StripDirective)] |
| 1 | 646 _dir_by_name = dict(directives) |
| 647 _dir_order = [directive[1] for directive in directives] | |
| 648 | |
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649 def __init__(self, source, basedir=None, filename=None): |
| 1 | 650 """Initialize a template from either a string or a file-like object.""" |
| 651 if isinstance(source, basestring): | |
| 652 self.source = StringIO(source) | |
| 653 else: | |
| 654 self.source = source | |
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655 self.basedir = basedir |
| 1 | 656 self.filename = filename or '<string>' |
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657 if basedir and filename: |
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658 self.filepath = os.path.join(basedir, filename) |
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659 else: |
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660 self.filepath = '<string>' |
| 1 | 661 |
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662 self.filters = [] |
| 1 | 663 self.parse() |
| 664 | |
| 665 def __repr__(self): | |
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666 return '<%s "%s">' % (self.__class__.__name__, self.filename) |
| 1 | 667 |
| 668 def parse(self): | |
| 669 """Parse the template. | |
| 670 | |
| 671 The parsing stage parses the XML template and constructs a list of | |
| 672 directives that will be executed in the render stage. The input is | |
| 673 split up into literal output (markup that does not depend on the | |
| 674 context data) and actual directives (commands or variable | |
| 675 substitution). | |
| 676 """ | |
| 677 stream = [] # list of events of the "compiled" template | |
| 678 dirmap = {} # temporary mapping of directives to elements | |
| 679 ns_prefix = {} | |
| 680 depth = 0 | |
| 681 | |
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682 for kind, data, pos in XMLParser(self.source, filename=self.filename): |
| 1 | 683 |
| 69 | 684 if kind is START_NS: |
| 1 | 685 # Strip out the namespace declaration for template directives |
| 686 prefix, uri = data | |
| 687 if uri == self.NAMESPACE: | |
| 688 ns_prefix[prefix] = uri | |
| 689 else: | |
| 690 stream.append((kind, data, pos)) | |
| 691 | |
| 69 | 692 elif kind is END_NS: |
| 1 | 693 if data in ns_prefix: |
| 694 del ns_prefix[data] | |
| 695 else: | |
| 696 stream.append((kind, data, pos)) | |
| 697 | |
| 69 | 698 elif kind is START: |
| 1 | 699 # Record any directive attributes in start tags |
| 700 tag, attrib = data | |
| 701 directives = [] | |
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702 strip = False |
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703 |
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704 if tag in self.NAMESPACE: |
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705 cls = self._dir_by_name.get(tag.localname) |
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706 if cls is None: |
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707 raise BadDirectiveError(tag, pos[0], pos[1]) |
|
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708 value = attrib.get(getattr(cls, 'ATTRIBUTE', None), '') |
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709 directives.append(cls(value)) |
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710 strip = True |
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711 |
| 1 | 712 new_attrib = [] |
| 713 for name, value in attrib: | |
|
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714 if name in self.NAMESPACE: |
| 1 | 715 cls = self._dir_by_name.get(name.localname) |
| 716 if cls is None: | |
|
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717 raise BadDirectiveError(name, pos[0], pos[1]) |
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718 directives.append(cls(value)) |
| 1 | 719 else: |
| 720 value = list(self._interpolate(value, *pos)) | |
| 721 new_attrib.append((name, value)) | |
|
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722 |
| 1 | 723 if directives: |
|
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724 directives.sort(lambda a, b: cmp(self._dir_order.index(a.__class__), |
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725 self._dir_order.index(b.__class__))) |
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726 dirmap[(depth, tag)] = (directives, len(stream), strip) |
| 1 | 727 |
| 728 stream.append((kind, (tag, Attributes(new_attrib)), pos)) | |
| 729 depth += 1 | |
| 730 | |
| 69 | 731 elif kind is END: |
| 1 | 732 depth -= 1 |
| 733 stream.append((kind, data, pos)) | |
| 734 | |
| 735 # If there have have directive attributes with the corresponding | |
| 736 # start tag, move the events inbetween into a "subprogram" | |
| 737 if (depth, data) in dirmap: | |
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738 directives, start_offset, strip = dirmap.pop((depth, data)) |
| 1 | 739 substream = stream[start_offset:] |
|
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740 if strip: |
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741 substream = substream[1:-1] |
| 69 | 742 stream[start_offset:] = [(SUB, (directives, substream), |
| 743 pos)] | |
| 1 | 744 |
| 69 | 745 elif kind is TEXT: |
| 1 | 746 for kind, data, pos in self._interpolate(data, *pos): |
| 747 stream.append((kind, data, pos)) | |
| 748 | |
| 749 else: | |
| 750 stream.append((kind, data, pos)) | |
| 751 | |
| 752 self.stream = stream | |
| 753 | |
| 754 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}') | |
| 755 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') | |
| 756 | |
|
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757 def _interpolate(cls, text, filename=None, lineno=-1, offset=-1): |
| 1 | 758 """Parse the given string and extract expressions. |
| 759 | |
| 760 This method returns a list containing both literal text and `Expression` | |
| 761 objects. | |
|
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762 |
| 1 | 763 @param text: the text to parse |
| 764 @param lineno: the line number at which the text was found (optional) | |
| 765 @param offset: the column number at which the text starts in the source | |
| 766 (optional) | |
| 767 """ | |
|
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768 def _interpolate(text, patterns): |
| 1 | 769 for idx, group in enumerate(patterns.pop(0).split(text)): |
| 770 if idx % 2: | |
| 69 | 771 yield EXPR, Expression(group), (lineno, offset) |
| 1 | 772 elif group: |
| 773 if patterns: | |
|
74
d54b5fd60b52
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
cmlenz
parents:
73
diff
changeset
|
774 for result in _interpolate(group, patterns[:]): |
| 1 | 775 yield result |
| 776 else: | |
| 69 | 777 yield TEXT, group.replace('$$', '$'), (filename, lineno, |
| 778 offset) | |
|
74
d54b5fd60b52
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
cmlenz
parents:
73
diff
changeset
|
779 return _interpolate(text, [cls._FULL_EXPR_RE, cls._SHORT_EXPR_RE]) |
| 1 | 780 _interpolate = classmethod(_interpolate) |
| 781 | |
|
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
|
782 def generate(self, 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
|
783 """Apply the template to the given 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
|
784 |
|
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
|
785 @param ctxt: a `Context` instance containing the data for the template |
|
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
|
786 @return: a markup event stream representing the result of applying |
|
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
|
787 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
|
788 """ |
|
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
|
789 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
|
790 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
|
791 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
|
792 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
|
793 |
| 69 | 794 stream = self.stream |
| 795 for filter_ in [self._eval, self._match, self._flatten] + self.filters: | |
|
35
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
796 stream = filter_(iter(stream), ctxt) |
|
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
797 return Stream(stream) |
|
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
|
798 |
|
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
|
799 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
|
800 """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
|
801 `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
|
802 """ |
|
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
|
803 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
|
804 |
| 69 | 805 if kind is START: |
|
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
|
806 # 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
|
807 # 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
|
808 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
|
809 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
|
810 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
|
811 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
|
812 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
|
813 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
|
814 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
|
815 for subkind, subdata, subpos in substream: |
| 69 | 816 if subkind is EXPR: |
|
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
|
817 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
|
818 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
|
819 values.append(subdata) |
|
48
a5d585dd38c4
convert the result of expressions in attributes to strings so that values like ints are output correctly
mgood
parents:
44
diff
changeset
|
820 value = [unicode(x) for x in values if x is not None] |
|
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
|
821 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
|
822 continue |
|
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
823 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
|
824 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
|
825 |
| 69 | 826 elif kind is EXPR: |
|
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
|
827 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
|
828 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
|
829 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
|
830 |
|
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
|
831 # 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
|
832 # 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
|
833 # 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
|
834 if isinstance(result, basestring): |
| 69 | 835 yield TEXT, 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
|
836 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
|
837 # 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
|
838 # 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
|
839 try: |
|
35
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
840 for event in self._match(self._eval(iter(result), ctxt), |
|
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
841 ctxt): |
|
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
842 yield event |
|
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
|
843 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
|
844 # 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
|
845 # through |
| 69 | 846 yield 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
|
847 |
|
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
|
848 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
|
849 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
|
850 |
|
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
851 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
|
852 """Internal stream filter that expands `SUB` events in the stream.""" |
|
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
|
853 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
|
854 for kind, data, pos in stream: |
| 69 | 855 if kind is SUB: |
|
35
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
856 # This event is a list of directives and a list of nested |
|
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
857 # events to which those directives should be applied |
|
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
|
858 directives, substream = data |
| 69 | 859 if directives: |
| 860 substream = directives[0](iter(substream), ctxt, | |
| 861 directives[1:]) | |
| 862 for filter_ in (self._eval, self._match, self._flatten): | |
| 863 substream = filter_(substream, ctxt) | |
| 864 for event in substream: | |
|
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
|
865 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
|
866 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
|
867 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
|
868 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
|
869 except SyntaxError, err: |
| 69 | 870 raise TemplateSyntaxError(err, pos[0], pos[1], |
|
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
871 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
|
872 |
|
36
ed370ebfa794
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
873 def _match(self, stream, ctxt=None, match_templates=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
|
874 """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
|
875 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
|
876 """ |
|
36
ed370ebfa794
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
877 if match_templates is None: |
|
ed370ebfa794
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
878 match_templates = ctxt._match_templates |
|
ed370ebfa794
Fix for #7: match templates no longer process their own output.
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879 |
|
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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880 for kind, data, pos in stream: |
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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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881 |
|
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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882 # 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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883 # We might care about namespace events in the future, though |
| 69 | 884 if kind not in (START, 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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885 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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886 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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887 |
|
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Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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888 for idx, (test, path, template, directives) in \ |
|
d3842cd76e92
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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|
889 enumerate(match_templates): |
|
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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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890 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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|
891 |
|
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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892 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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893 # 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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894 # 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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895 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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896 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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diff
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|
897 while depth > 0: |
| 73 | 898 kind, data, pos = stream.next() |
| 899 if kind is START: | |
| 900 depth += 1 | |
| 901 elif kind is END: | |
| 902 depth -= 1 | |
| 903 content.append((kind, data, pos)) | |
| 904 test(kind, data, pos) | |
|
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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|
905 |
|
23
d88358f719fa
Separate match and eval filters from the include and user-supplied filters.
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|
906 content = list(self._flatten(content, ctxt)) |
|
35
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
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907 ctxt.push(select=lambda path: Stream(content).select(path)) |
|
36
ed370ebfa794
Fix for #7: match templates no longer process their own output.
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908 |
|
50
d3842cd76e92
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
cmlenz
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|
909 if directives: |
|
d3842cd76e92
Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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910 template = directives[0](iter(template), ctxt, |
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Fix the way multiple directives are applied to a single `SUB` in many cases by making the directives themselves responsible for applying any remaining directives.
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911 directives[1:]) |
| 69 | 912 for event in self._match(self._eval(template, ctxt), |
| 913 ctxt, match_templates[:idx] + | |
| 914 match_templates[idx + 1:]): | |
|
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Simplify template processing model by removing dynamically generated `SUB` events.
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|
915 yield event |
|
35b9e9318fb1
Simplify template processing model by removing dynamically generated `SUB` events.
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|
916 ctxt.pop() |
|
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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|
917 |
|
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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|
918 break |
| 69 | 919 |
| 920 else: # no matches | |
|
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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|
921 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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|
922 |
| 1 | 923 |
| 69 | 924 EXPR = Template.EXPR |
| 925 SUB = Template.SUB | |
| 926 | |
| 927 | |
| 1 | 928 class TemplateLoader(object): |
| 929 """Responsible for loading templates from files on the specified search | |
| 930 path. | |
| 931 | |
| 932 >>> import tempfile | |
| 933 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
| 934 >>> os.write(fd, '<p>$var</p>') | |
| 935 11 | |
| 936 >>> os.close(fd) | |
| 937 | |
| 938 The template loader accepts a list of directory paths that are then used | |
| 939 when searching for template files, in the given order: | |
| 940 | |
| 941 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
| 942 | |
| 943 The `load()` method first checks the template cache whether the requested | |
| 944 template has already been loaded. If not, it attempts to locate the | |
| 945 template file, and returns the corresponding `Template` object: | |
| 946 | |
| 947 >>> template = loader.load(os.path.basename(path)) | |
| 948 >>> isinstance(template, Template) | |
| 949 True | |
| 950 | |
| 951 Template instances are cached: requesting a template with the same name | |
| 952 results in the same instance being returned: | |
| 953 | |
| 954 >>> loader.load(os.path.basename(path)) is template | |
| 955 True | |
| 956 """ | |
| 957 def __init__(self, search_path=None, auto_reload=False): | |
| 958 """Create the template laoder. | |
| 959 | |
| 960 @param search_path: a list of absolute path names that should be | |
| 961 searched for template files | |
| 962 @param auto_reload: whether to check the last modification time of | |
| 963 template files, and reload them if they have changed | |
| 964 """ | |
| 965 self.search_path = search_path | |
| 966 if self.search_path is None: | |
| 967 self.search_path = [] | |
| 968 self.auto_reload = auto_reload | |
| 969 self._cache = {} | |
| 970 self._mtime = {} | |
| 971 | |
|
21
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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|
972 def load(self, filename, relative_to=None): |
| 1 | 973 """Load the template with the given name. |
| 974 | |
|
22
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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|
975 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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|
976 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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|
977 name is an absolute path, the search path is not bypassed. |
| 1 | 978 |
|
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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|
979 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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|
980 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
parents:
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|
981 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
|
982 |
|
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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changeset
|
983 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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|
984 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
parents:
21
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|
985 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
parents:
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|
986 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.
cmlenz
parents:
21
diff
changeset
|
987 changed since the last parse.) |
| 1 | 988 |
|
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
989 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.
cmlenz
parents:
18
diff
changeset
|
990 interpreted as being relative to that path. |
|
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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diff
changeset
|
991 |
| 1 | 992 @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.
cmlenz
parents:
18
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|
993 @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
parents:
18
diff
changeset
|
994 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.
cmlenz
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18
diff
changeset
|
995 directly |
| 1 | 996 """ |
| 69 | 997 from markup.filters import IncludeFilter |
| 998 | |
|
21
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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parents:
18
diff
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|
999 if relative_to: |
|
b4d17897d053
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1000 filename = posixpath.join(posixpath.dirname(relative_to), filename) |
| 1 | 1001 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.
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|
1002 |
|
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
|
1003 # First check the cache to avoid reparsing the same file |
| 1 | 1004 try: |
| 1005 tmpl = self._cache[filename] | |
| 1006 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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|
1007 os.path.getmtime(tmpl.filepath) == self._mtime[filename]: |
| 1 | 1008 return tmpl |
| 1009 except KeyError: | |
| 1010 pass | |
|
22
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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|
1011 |
|
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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changeset
|
1012 # 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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|
1013 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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1014 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.
cmlenz
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|
1015 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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|
1016 |
|
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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|
1017 for dirname in search_path: |
| 1 | 1018 filepath = os.path.join(dirname, filename) |
| 1019 try: | |
| 1020 fileobj = file(filepath, 'rt') | |
| 1021 try: | |
|
21
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* Include paths are now interpreted relative to the path of the including template. Closes #3.
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|
1022 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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1023 tmpl.filters.append(IncludeFilter(self)) |
| 1 | 1024 finally: |
| 1025 fileobj.close() | |
| 1026 self._cache[filename] = tmpl | |
| 1027 self._mtime[filename] = os.path.getmtime(filepath) | |
| 1028 return tmpl | |
| 1029 except IOError: | |
| 1030 continue | |
| 1031 raise TemplateNotFound(filename, self.search_path) |