Mercurial > genshi > genshi-test
annotate markup/template.py @ 191:929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
author | cmlenz |
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date | Wed, 23 Aug 2006 15:00:28 +0000 |
parents | f0b32f1c478c |
children | cda3bdfc19ed |
rev | line source |
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1 | 1 # -*- coding: utf-8 -*- |
2 # | |
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3 # Copyright (C) 2006 Edgewall Software |
1 | 4 # All rights reserved. |
5 # | |
6 # This software is licensed as described in the file COPYING, which | |
7 # you should have received as part of this distribution. The terms | |
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8 # are also available at http://markup.edgewall.org/wiki/License. |
1 | 9 # |
10 # This software consists of voluntary contributions made by many | |
11 # individuals. For the exact contribution history, see the revision | |
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12 # history and logs, available at http://markup.edgewall.org/log/. |
1 | 13 |
82 | 14 """Implementation of the template engine.""" |
1 | 15 |
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16 try: |
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17 from collections import deque |
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18 except ImportError: |
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19 class deque(list): |
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20 def appendleft(self, x): self.insert(0, x) |
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21 def popleft(self): return self.pop(0) |
1 | 22 import compiler |
23 import os | |
24 import re | |
25 from StringIO import StringIO | |
26 | |
182
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27 from markup.core import Attrs, Namespace, Stream, StreamEventKind, _ensure |
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28 from markup.core import START, END, START_NS, END_NS, TEXT, COMMENT |
1 | 29 from markup.eval import Expression |
69 | 30 from markup.input import XMLParser |
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31 from markup.path import Path |
1 | 32 |
150
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33 __all__ = ['BadDirectiveError', 'TemplateError', 'TemplateSyntaxError', |
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34 'TemplateNotFound', 'Template', 'TemplateLoader'] |
1 | 35 |
36 | |
37 class TemplateError(Exception): | |
38 """Base exception class for errors related to template processing.""" | |
39 | |
40 | |
41 class TemplateSyntaxError(TemplateError): | |
42 """Exception raised when an expression in a template causes a Python syntax | |
43 error.""" | |
44 | |
45 def __init__(self, message, filename='<string>', lineno=-1, offset=-1): | |
46 if isinstance(message, SyntaxError) and message.lineno is not None: | |
47 message = str(message).replace(' (line %d)' % message.lineno, '') | |
80 | 48 message = '%s (%s, line %d)' % (message, filename, lineno) |
1 | 49 TemplateError.__init__(self, message) |
50 self.filename = filename | |
51 self.lineno = lineno | |
52 self.offset = offset | |
53 | |
54 | |
55 class BadDirectiveError(TemplateSyntaxError): | |
56 """Exception raised when an unknown directive is encountered when parsing | |
57 a template. | |
58 | |
59 An unknown directive is any attribute using the namespace for directives, | |
60 with a local name that doesn't match any registered directive. | |
61 """ | |
62 | |
63 def __init__(self, name, filename='<string>', lineno=-1): | |
181
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64 msg = 'bad directive "%s"' % name.localname |
80 | 65 TemplateSyntaxError.__init__(self, msg, filename, lineno) |
1 | 66 |
67 | |
68 class TemplateNotFound(TemplateError): | |
69 """Exception raised when a specific template file could not be found.""" | |
70 | |
71 def __init__(self, name, search_path): | |
72 TemplateError.__init__(self, 'Template "%s" not found' % name) | |
73 self.search_path = search_path | |
74 | |
75 | |
76 class Context(object): | |
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77 """Container for template input data. |
1 | 78 |
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79 A context provides a stack of scopes (represented by dictionaries). |
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80 |
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81 Template directives such as loops can push a new scope on the stack with |
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82 data that should only be available inside the loop. When the loop |
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83 terminates, that scope can get popped off the stack again. |
1 | 84 |
85 >>> ctxt = Context(one='foo', other=1) | |
86 >>> ctxt.get('one') | |
87 'foo' | |
88 >>> ctxt.get('other') | |
89 1 | |
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90 >>> ctxt.push(dict(one='frost')) |
1 | 91 >>> ctxt.get('one') |
92 'frost' | |
93 >>> ctxt.get('other') | |
94 1 | |
95 >>> ctxt.pop() | |
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96 {'one': 'frost'} |
1 | 97 >>> ctxt.get('one') |
98 'foo' | |
99 """ | |
100 | |
101 def __init__(self, **data): | |
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102 self.frames = deque([data]) |
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103 self.pop = self.frames.popleft |
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104 self.push = self.frames.appendleft |
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105 self._match_templates = [] |
1 | 106 |
107 def __repr__(self): | |
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108 return repr(self.frames) |
1 | 109 |
110 def __setitem__(self, key, value): | |
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111 """Set a variable in the current scope.""" |
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112 self.frames[0][key] = value |
1 | 113 |
114 def get(self, key): | |
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115 """Get a variable's value, starting at the current scope and going |
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116 upward. |
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117 """ |
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118 for frame in self.frames: |
1 | 119 if key in frame: |
120 return frame[key] | |
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121 __getitem__ = get |
1 | 122 |
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123 def push(self, data): |
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124 """Push a new scope on the stack.""" |
1 | 125 |
126 def pop(self): | |
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127 """Pop the top-most scope from the stack.""" |
1 | 128 |
129 | |
130 class Directive(object): | |
131 """Abstract base class for template directives. | |
132 | |
54 | 133 A directive is basically a callable that takes three positional arguments: |
134 `ctxt` is the template data context, `stream` is an iterable over the | |
135 events that the directive applies to, and `directives` is is a list of | |
136 other directives on the same stream that need to be applied. | |
1 | 137 |
138 Directives can be "anonymous" or "registered". Registered directives can be | |
139 applied by the template author using an XML attribute with the | |
140 corresponding name in the template. Such directives should be subclasses of | |
31 | 141 this base class that can be instantiated with the value of the directive |
142 attribute as parameter. | |
1 | 143 |
144 Anonymous directives are simply functions conforming to the protocol | |
145 described above, and can only be applied programmatically (for example by | |
146 template filters). | |
147 """ | |
148 __slots__ = ['expr'] | |
149 | |
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150 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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151 try: |
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152 self.expr = value and Expression(value, filename, lineno) or None |
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153 except SyntaxError, err: |
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154 err.msg += ' in expression "%s" of "%s" directive' % (value, |
172
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155 self.tagname) |
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156 raise TemplateSyntaxError(err, filename, lineno, |
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157 offset + (err.offset or 0)) |
1 | 158 |
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159 def __call__(self, stream, ctxt, directives): |
1 | 160 raise NotImplementedError |
161 | |
162 def __repr__(self): | |
163 expr = '' | |
164 if self.expr is not None: | |
165 expr = ' "%s"' % self.expr.source | |
166 return '<%s%s>' % (self.__class__.__name__, expr) | |
167 | |
172
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168 def tagname(self): |
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169 """Return the local tag name of the directive as it is used in |
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170 templates. |
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171 """ |
166
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172 return self.__class__.__name__.lower().replace('directive', '') |
172
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173 tagname = property(tagname) |
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174 |
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175 |
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176 def _apply_directives(stream, ctxt, directives): |
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177 """Apply the given directives to the stream.""" |
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178 if directives: |
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179 stream = directives[0](iter(stream), ctxt, directives[1:]) |
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180 return stream |
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181 |
1 | 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 | |
61 | 189 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 190 ... <li py:attrs="foo">Bar</li> |
191 ... </ul>''') | |
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192 >>> print tmpl.generate(foo={'class': 'collapse'}) |
1 | 193 <ul> |
194 <li class="collapse">Bar</li> | |
195 </ul> | |
196 | |
197 If the value evaluates to `None` (or any other non-truth value), no | |
198 attributes are added: | |
199 | |
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200 >>> print tmpl.generate(foo=None) |
1 | 201 <ul> |
202 <li>Bar</li> | |
203 </ul> | |
204 """ | |
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205 __slots__ = [] |
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206 |
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207 def __call__(self, stream, ctxt, directives): |
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208 def _generate(): |
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209 kind, (tag, attrib), pos = stream.next() |
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210 attrs = self.expr.evaluate(ctxt) |
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211 if attrs: |
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212 attrib = Attrs(attrib[:]) |
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213 if isinstance(attrs, Stream): |
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214 try: |
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215 attrs = iter(attrs).next() |
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216 except StopIteration: |
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217 attrs = [] |
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218 elif not isinstance(attrs, list): # assume it's a dict |
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219 attrs = attrs.items() |
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220 for name, value in attrs: |
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221 if value is None: |
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222 attrib.remove(name) |
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223 else: |
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224 attrib.set(name, unicode(value).strip()) |
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225 yield kind, (tag, attrib), pos |
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226 for event in stream: |
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227 yield event |
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228 |
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229 return _apply_directives(_generate(), ctxt, directives) |
1 | 230 |
231 | |
232 class ContentDirective(Directive): | |
233 """Implementation of the `py:content` template directive. | |
234 | |
235 This directive replaces the content of the element with the result of | |
236 evaluating the value of the `py:content` attribute: | |
237 | |
61 | 238 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 239 ... <li py:content="bar">Hello</li> |
240 ... </ul>''') | |
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241 >>> print tmpl.generate(bar='Bye') |
1 | 242 <ul> |
243 <li>Bye</li> | |
244 </ul> | |
245 """ | |
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246 __slots__ = [] |
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247 |
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248 def __call__(self, stream, ctxt, directives): |
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249 def _generate(): |
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250 kind, data, pos = stream.next() |
101 | 251 if kind is START: |
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252 yield kind, data, pos # emit start tag |
69 | 253 yield EXPR, self.expr, pos |
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254 previous = stream.next() |
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255 for event in stream: |
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256 previous = event |
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257 if previous is not None: |
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258 yield previous |
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259 |
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260 return _apply_directives(_generate(), ctxt, directives) |
1 | 261 |
262 | |
263 class DefDirective(Directive): | |
264 """Implementation of the `py:def` template directive. | |
265 | |
266 This directive can be used to create "Named Template Functions", which | |
267 are template snippets that are not actually output during normal | |
268 processing, but rather can be expanded from expressions in other places | |
269 in the template. | |
270 | |
271 A named template function can be used just like a normal Python function | |
272 from template expressions: | |
273 | |
61 | 274 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 275 ... <p py:def="echo(greeting, name='world')" class="message"> |
276 ... ${greeting}, ${name}! | |
277 ... </p> | |
90
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278 ... ${echo('Hi', name='you')} |
1 | 279 ... </div>''') |
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280 >>> print tmpl.generate(bar='Bye') |
1 | 281 <div> |
282 <p class="message"> | |
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283 Hi, you! |
1 | 284 </p> |
285 </div> | |
286 | |
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287 If a function does not require parameters, the parenthesis can be omitted |
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288 both when defining and when calling it: |
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289 |
61 | 290 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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291 ... <p py:def="helloworld" class="message"> |
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292 ... Hello, world! |
1 | 293 ... </p> |
90
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294 ... ${helloworld} |
1 | 295 ... </div>''') |
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296 >>> print tmpl.generate(bar='Bye') |
1 | 297 <div> |
298 <p class="message"> | |
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299 Hello, world! |
1 | 300 </p> |
301 </div> | |
302 """ | |
154
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303 __slots__ = ['name', 'args', 'defaults'] |
1 | 304 |
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305 ATTRIBUTE = 'function' |
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306 |
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307 def __init__(self, args, filename=None, lineno=-1, offset=-1): |
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308 Directive.__init__(self, None, filename, lineno, offset) |
1 | 309 ast = compiler.parse(args, 'eval').node |
310 self.args = [] | |
311 self.defaults = {} | |
312 if isinstance(ast, compiler.ast.CallFunc): | |
313 self.name = ast.node.name | |
314 for arg in ast.args: | |
315 if isinstance(arg, compiler.ast.Keyword): | |
316 self.args.append(arg.name) | |
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317 self.defaults[arg.name] = Expression(arg.expr, filename, |
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318 lineno) |
1 | 319 else: |
320 self.args.append(arg.name) | |
321 else: | |
322 self.name = ast.name | |
323 | |
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324 def __call__(self, stream, ctxt, directives): |
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325 stream = list(stream) |
1 | 326 |
154
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327 def function(*args, **kwargs): |
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328 scope = {} |
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329 args = list(args) # make mutable |
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330 for name in self.args: |
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331 if args: |
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332 scope[name] = args.pop(0) |
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333 else: |
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334 if name in kwargs: |
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335 val = kwargs.pop(name) |
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336 else: |
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337 val = self.defaults.get(name).evaluate(ctxt) |
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338 scope[name] = val |
154
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339 ctxt.push(scope) |
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340 for event in _apply_directives(stream, ctxt, directives): |
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341 yield event |
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342 ctxt.pop() |
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343 try: |
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344 function.__name__ = self.name |
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345 except TypeError: |
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346 # Function name can't be set in Python 2.3 |
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347 pass |
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348 |
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349 # Store the function reference in the bottom context frame so that it |
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350 # doesn't get popped off before processing the template has finished |
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351 ctxt.frames[-1][self.name] = function |
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352 |
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353 return [] |
1 | 354 |
172
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355 def __repr__(self): |
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356 return '<%s "%s">' % (self.__class__.__name__, self.name) |
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357 |
1 | 358 |
359 class ForDirective(Directive): | |
31 | 360 """Implementation of the `py:for` template directive for repeating an |
361 element based on an iterable in the context data. | |
1 | 362 |
61 | 363 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 364 ... <li py:for="item in items">${item}</li> |
365 ... </ul>''') | |
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366 >>> print tmpl.generate(items=[1, 2, 3]) |
1 | 367 <ul> |
368 <li>1</li><li>2</li><li>3</li> | |
369 </ul> | |
370 """ | |
371 __slots__ = ['targets'] | |
372 | |
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373 ATTRIBUTE = 'each' |
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374 |
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375 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
181
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376 if ' in ' not in value: |
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377 raise TemplateSyntaxError('"in" keyword missing in "for" directive', |
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378 filename, lineno, offset) |
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379 targets, value = value.split(' in ', 1) |
1 | 380 self.targets = [str(name.strip()) for name in targets.split(',')] |
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381 Directive.__init__(self, value.strip(), filename, lineno, offset) |
1 | 382 |
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383 def __call__(self, stream, ctxt, directives): |
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384 iterable = self.expr.evaluate(ctxt) |
101 | 385 if iterable is None: |
386 return | |
387 | |
388 scope = {} | |
389 stream = list(stream) | |
390 targets = self.targets | |
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391 single = len(targets) == 1 |
101 | 392 for item in iter(iterable): |
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393 if single: |
101 | 394 scope[targets[0]] = item |
395 else: | |
396 for idx, name in enumerate(targets): | |
397 scope[name] = item[idx] | |
398 ctxt.push(scope) | |
399 for event in _apply_directives(stream, ctxt, directives): | |
400 yield event | |
401 ctxt.pop() | |
1 | 402 |
403 def __repr__(self): | |
404 return '<%s "%s in %s">' % (self.__class__.__name__, | |
405 ', '.join(self.targets), self.expr.source) | |
406 | |
407 | |
408 class IfDirective(Directive): | |
31 | 409 """Implementation of the `py:if` template directive for conditionally |
410 excluding elements from being output. | |
1 | 411 |
61 | 412 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 413 ... <b py:if="foo">${bar}</b> |
414 ... </div>''') | |
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415 >>> print tmpl.generate(foo=True, bar='Hello') |
1 | 416 <div> |
417 <b>Hello</b> | |
418 </div> | |
419 """ | |
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420 __slots__ = [] |
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421 |
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422 ATTRIBUTE = 'test' |
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423 |
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424 def __call__(self, stream, ctxt, directives): |
1 | 425 if self.expr.evaluate(ctxt): |
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426 return _apply_directives(stream, ctxt, directives) |
1 | 427 return [] |
428 | |
429 | |
430 class MatchDirective(Directive): | |
431 """Implementation of the `py:match` template directive. | |
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432 |
61 | 433 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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434 ... <span py:match="greeting"> |
1 | 435 ... Hello ${select('@name')} |
436 ... </span> | |
437 ... <greeting name="Dude" /> | |
438 ... </div>''') | |
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439 >>> print tmpl.generate() |
1 | 440 <div> |
441 <span> | |
442 Hello Dude | |
443 </span> | |
444 </div> | |
445 """ | |
446 __slots__ = ['path', 'stream'] | |
447 | |
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448 ATTRIBUTE = 'path' |
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449 |
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450 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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451 Directive.__init__(self, None, filename, lineno, offset) |
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452 self.path = Path(value, filename, lineno) |
1 | 453 self.stream = [] |
454 | |
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455 def __call__(self, stream, ctxt, directives): |
1 | 456 self.stream = list(stream) |
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457 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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458 self.path, self.stream, directives)) |
1 | 459 return [] |
460 | |
461 def __repr__(self): | |
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462 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
1 | 463 |
464 | |
465 class ReplaceDirective(Directive): | |
466 """Implementation of the `py:replace` template directive. | |
467 | |
31 | 468 This directive replaces the element with the result of evaluating the |
469 value of the `py:replace` attribute: | |
470 | |
61 | 471 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 472 ... <span py:replace="bar">Hello</span> |
473 ... </div>''') | |
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474 >>> print tmpl.generate(bar='Bye') |
1 | 475 <div> |
476 Bye | |
477 </div> | |
478 | |
479 This directive is equivalent to `py:content` combined with `py:strip`, | |
480 providing a less verbose way to achieve the same effect: | |
481 | |
61 | 482 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 483 ... <span py:content="bar" py:strip="">Hello</span> |
484 ... </div>''') | |
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485 >>> print tmpl.generate(bar='Bye') |
1 | 486 <div> |
487 Bye | |
488 </div> | |
489 """ | |
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490 __slots__ = [] |
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491 |
54 | 492 def __call__(self, stream, ctxt, directives): |
1 | 493 kind, data, pos = stream.next() |
69 | 494 yield EXPR, self.expr, pos |
1 | 495 |
496 | |
497 class StripDirective(Directive): | |
498 """Implementation of the `py:strip` template directive. | |
499 | |
500 When the value of the `py:strip` attribute evaluates to `True`, the element | |
501 is stripped from the output | |
502 | |
61 | 503 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 504 ... <div py:strip="True"><b>foo</b></div> |
505 ... </div>''') | |
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506 >>> print tmpl.generate() |
1 | 507 <div> |
508 <b>foo</b> | |
509 </div> | |
510 | |
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511 Leaving the attribute value empty is equivalent to a truth value. |
1 | 512 |
513 This directive is particulary interesting for named template functions or | |
514 match templates that do not generate a top-level element: | |
515 | |
61 | 516 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 517 ... <div py:def="echo(what)" py:strip=""> |
518 ... <b>${what}</b> | |
519 ... </div> | |
520 ... ${echo('foo')} | |
521 ... </div>''') | |
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522 >>> print tmpl.generate() |
1 | 523 <div> |
524 <b>foo</b> | |
525 </div> | |
526 """ | |
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527 __slots__ = [] |
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528 |
54 | 529 def __call__(self, stream, ctxt, directives): |
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530 def _generate(): |
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531 if self.expr: |
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532 strip = self.expr.evaluate(ctxt) |
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533 else: |
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534 strip = True |
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535 if strip: |
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536 stream.next() # skip start tag |
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537 previous = stream.next() |
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538 for event in stream: |
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539 yield previous |
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540 previous = event |
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541 else: |
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542 for event in stream: |
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543 yield event |
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544 |
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545 return _apply_directives(_generate(), ctxt, directives) |
1 | 546 |
547 | |
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548 class ChooseDirective(Directive): |
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549 """Implementation of the `py:choose` directive for conditionally selecting |
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550 one of several body elements to display. |
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551 |
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552 If the `py:choose` expression is empty the expressions of nested `py:when` |
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553 directives are tested for truth. The first true `py:when` body is output. |
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554 If no `py:when` directive is matched then the fallback directive |
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555 `py:otherwise` will be used. |
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556 |
61 | 557 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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558 ... py:choose=""> |
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559 ... <span py:when="0 == 1">0</span> |
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560 ... <span py:when="1 == 1">1</span> |
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561 ... <span py:otherwise="">2</span> |
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562 ... </div>''') |
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563 >>> print tmpl.generate() |
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564 <div> |
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565 <span>1</span> |
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566 </div> |
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567 |
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568 If the `py:choose` directive contains an expression, the nested `py:when` |
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569 directives are tested for equality to the `py:choose` expression: |
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570 |
61 | 571 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
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572 ... py:choose="2"> |
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573 ... <span py:when="1">1</span> |
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574 ... <span py:when="2">2</span> |
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575 ... </div>''') |
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576 >>> print tmpl.generate() |
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577 <div> |
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578 <span>2</span> |
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579 </div> |
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580 |
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581 Behavior is undefined if a `py:choose` block contains content outside a |
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582 `py:when` or `py:otherwise` block. Behavior is also undefined if a |
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583 `py:otherwise` occurs before `py:when` blocks. |
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584 """ |
50
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585 __slots__ = ['matched', 'value'] |
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586 |
65
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587 ATTRIBUTE = 'test' |
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588 |
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589 def __call__(self, stream, ctxt, directives): |
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590 if self.expr: |
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591 self.value = self.expr.evaluate(ctxt) |
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592 self.matched = False |
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593 ctxt.push(dict(_choose=self)) |
78
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594 for event in _apply_directives(stream, ctxt, directives): |
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595 yield event |
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596 ctxt.pop() |
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597 |
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598 |
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599 class WhenDirective(Directive): |
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600 """Implementation of the `py:when` directive for nesting in a parent with |
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601 the `py:choose` directive. |
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602 |
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603 See the documentation of `py:choose` for usage. |
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604 """ |
65
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605 |
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606 ATTRIBUTE = 'test' |
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607 |
54 | 608 def __call__(self, stream, ctxt, directives): |
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609 choose = ctxt['_choose'] |
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610 if not choose: |
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611 raise TemplateSyntaxError('"when" directives can only be used ' |
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612 'inside a "choose" directive', |
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613 *stream.next()[2]) |
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614 if choose.matched: |
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615 return [] |
181
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616 if not self.expr: |
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617 raise TemplateSyntaxError('"when" directive has no test condition', |
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618 *stream.next()[2]) |
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619 value = self.expr.evaluate(ctxt) |
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620 try: |
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621 if value == choose.value: |
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622 choose.matched = True |
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623 return _apply_directives(stream, ctxt, directives) |
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624 except AttributeError: |
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625 if value: |
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626 choose.matched = True |
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627 return _apply_directives(stream, ctxt, directives) |
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628 return [] |
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629 |
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630 |
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631 class OtherwiseDirective(Directive): |
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632 """Implementation of the `py:otherwise` directive for nesting in a parent |
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633 with the `py:choose` directive. |
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634 |
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635 See the documentation of `py:choose` for usage. |
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636 """ |
54 | 637 def __call__(self, stream, ctxt, directives): |
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638 choose = ctxt['_choose'] |
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639 if not choose: |
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640 raise TemplateSyntaxError('an "otherwise" directive can only be ' |
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641 'used inside a "choose" directive', |
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Better error reporting for errors in directive expressions, and when `py:otherwise`/`py:when` are used outside a `py:choose` directive. Thanks to Christian Boos for the initial patch.
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642 *stream.next()[2]) |
44
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643 if choose.matched: |
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644 return [] |
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645 choose.matched = True |
78
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Minor improvements to how directives are applied in template processing.
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646 return _apply_directives(stream, ctxt, directives) |
44
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647 |
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648 |
104
e9259920db05
Added `py:with` directive based on Jonas' patch in #17.
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649 class WithDirective(Directive): |
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650 """Implementation of the `py:with` template directive, which allows |
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651 shorthand access to variables and expressions. |
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652 |
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653 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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654 ... <span py:with="y=7; z=x+10">$x $y $z</span> |
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655 ... </div>''') |
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
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656 >>> print tmpl.generate(x=42) |
104
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657 <div> |
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658 <span>42 7 52</span> |
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659 </div> |
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660 """ |
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661 __slots__ = ['vars'] |
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662 |
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663 ATTRIBUTE = 'vars' |
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664 |
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665 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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666 Directive.__init__(self, None, filename, lineno, offset) |
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667 self.vars = [] |
190 | 668 value = value.strip() |
104
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669 try: |
190 | 670 ast = compiler.parse(value, 'exec').node |
671 for node in ast.nodes: | |
672 if isinstance(node, compiler.ast.Discard): | |
673 continue | |
674 elif not isinstance(node, compiler.ast.Assign): | |
675 raise TemplateSyntaxError('only assignment allowed in ' | |
676 'value of the "with" directive', | |
677 filename, lineno, offset) | |
678 self.vars.append(([n.name for n in node.nodes], | |
679 Expression(node.expr, filename, lineno))) | |
104
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680 except SyntaxError, err: |
190 | 681 err.msg += ' in expression "%s" of "%s" directive' % (value, |
682 self.tagname) | |
104
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Added `py:with` directive based on Jonas' patch in #17.
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683 raise TemplateSyntaxError(err, filename, lineno, |
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684 offset + (err.offset or 0)) |
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Added `py:with` directive based on Jonas' patch in #17.
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685 |
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Added `py:with` directive based on Jonas' patch in #17.
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686 def __call__(self, stream, ctxt, directives): |
190 | 687 frame = {} |
688 ctxt.push(frame) | |
689 for names, expr in self.vars: | |
690 value = expr.evaluate(ctxt, nocall=True) | |
691 frame.update(dict((name, value) for name in names)) | |
104
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Added `py:with` directive based on Jonas' patch in #17.
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101
diff
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692 for event in _apply_directives(stream, ctxt, directives): |
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693 yield event |
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diff
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|
694 ctxt.pop() |
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diff
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|
695 |
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diff
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|
696 def __repr__(self): |
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Added `py:with` directive based on Jonas' patch in #17.
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697 return '<%s "%s">' % (self.__class__.__name__, |
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698 '; '.join(['%s = %s' % (name, expr.source) |
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Added `py:with` directive based on Jonas' patch in #17.
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699 for name, expr in self.vars])) |
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Added `py:with` directive based on Jonas' patch in #17.
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700 |
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701 |
1 | 702 class Template(object): |
703 """Can parse a template and transform it into the corresponding output | |
704 based on context data. | |
705 """ | |
61 | 706 NAMESPACE = Namespace('http://markup.edgewall.org/') |
1 | 707 |
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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diff
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|
708 EXPR = StreamEventKind('EXPR') # an expression |
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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diff
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|
709 SUB = StreamEventKind('SUB') # a "subprogram" |
10
c5890ef863ba
Moved the template-specific stream event kinds into the template module.
cmlenz
parents:
6
diff
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|
710 |
1 | 711 directives = [('def', DefDirective), |
712 ('match', MatchDirective), | |
120 | 713 ('when', WhenDirective), |
714 ('otherwise', OtherwiseDirective), | |
1 | 715 ('for', ForDirective), |
716 ('if', IfDirective), | |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
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diff
changeset
|
717 ('choose', ChooseDirective), |
104
e9259920db05
Added `py:with` directive based on Jonas' patch in #17.
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718 ('with', WithDirective), |
1 | 719 ('replace', ReplaceDirective), |
720 ('content', ContentDirective), | |
721 ('attrs', AttrsDirective), | |
50
a053ffb834cb
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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diff
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|
722 ('strip', StripDirective)] |
1 | 723 _dir_by_name = dict(directives) |
724 _dir_order = [directive[1] for directive in directives] | |
725 | |
21
eca77129518a
* 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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|
726 def __init__(self, source, basedir=None, filename=None): |
1 | 727 """Initialize a template from either a string or a file-like object.""" |
728 if isinstance(source, basestring): | |
729 self.source = StringIO(source) | |
730 else: | |
731 self.source = source | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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18
diff
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|
732 self.basedir = basedir |
172
4b4e80b2b0b5
Fix for #30 (trouble using `py:def`inside a match template)
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166
diff
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|
733 self.filename = filename |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
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18
diff
changeset
|
734 if basedir and filename: |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
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735 self.filepath = os.path.join(basedir, filename) |
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* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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|
736 else: |
172
4b4e80b2b0b5
Fix for #30 (trouble using `py:def`inside a match template)
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737 self.filepath = None |
1 | 738 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
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22
diff
changeset
|
739 self.filters = [] |
1 | 740 self.parse() |
741 | |
742 def __repr__(self): | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
743 return '<%s "%s">' % (self.__class__.__name__, self.filename) |
1 | 744 |
745 def parse(self): | |
746 """Parse the template. | |
747 | |
748 The parsing stage parses the XML template and constructs a list of | |
749 directives that will be executed in the render stage. The input is | |
750 split up into literal output (markup that does not depend on the | |
751 context data) and actual directives (commands or variable | |
752 substitution). | |
753 """ | |
754 stream = [] # list of events of the "compiled" template | |
755 dirmap = {} # temporary mapping of directives to elements | |
756 ns_prefix = {} | |
757 depth = 0 | |
758 | |
21
eca77129518a
* 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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|
759 for kind, data, pos in XMLParser(self.source, filename=self.filename): |
1 | 760 |
69 | 761 if kind is START_NS: |
1 | 762 # Strip out the namespace declaration for template directives |
763 prefix, uri = data | |
764 if uri == self.NAMESPACE: | |
765 ns_prefix[prefix] = uri | |
766 else: | |
767 stream.append((kind, data, pos)) | |
768 | |
69 | 769 elif kind is END_NS: |
1 | 770 if data in ns_prefix: |
771 del ns_prefix[data] | |
772 else: | |
773 stream.append((kind, data, pos)) | |
774 | |
69 | 775 elif kind is START: |
1 | 776 # Record any directive attributes in start tags |
777 tag, attrib = data | |
778 directives = [] | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
779 strip = False |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
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|
780 |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
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diff
changeset
|
781 if tag in self.NAMESPACE: |
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Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
changeset
|
782 cls = self._dir_by_name.get(tag.localname) |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
783 if cls is None: |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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diff
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|
784 raise BadDirectiveError(tag, pos[0], pos[1]) |
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents:
65
diff
changeset
|
785 value = attrib.get(getattr(cls, 'ATTRIBUTE', None), '') |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
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|
786 directives.append(cls(value, *pos)) |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
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|
787 strip = True |
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Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
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61
diff
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|
788 |
1 | 789 new_attrib = [] |
790 for name, value in attrib: | |
18
4cbebb15a834
Actually make use of the `markup.core.Namespace` class, and add a couple of doctests.
cmlenz
parents:
17
diff
changeset
|
791 if name in self.NAMESPACE: |
1 | 792 cls = self._dir_by_name.get(name.localname) |
793 if cls is None: | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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parents:
61
diff
changeset
|
794 raise BadDirectiveError(name, pos[0], pos[1]) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
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diff
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|
795 directives.append(cls(value, *pos)) |
1 | 796 else: |
75
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
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74
diff
changeset
|
797 if value: |
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
798 value = list(self._interpolate(value, *pos)) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
799 if len(value) == 1 and value[0][0] is TEXT: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
800 value = value[0][1] |
75
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
801 else: |
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
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diff
changeset
|
802 value = [(TEXT, u'', pos)] |
1 | 803 new_attrib.append((name, value)) |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
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diff
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|
804 |
1 | 805 if directives: |
50
a053ffb834cb
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
parents:
48
diff
changeset
|
806 directives.sort(lambda a, b: cmp(self._dir_order.index(a.__class__), |
a053ffb834cb
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
parents:
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diff
changeset
|
807 self._dir_order.index(b.__class__))) |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
808 dirmap[(depth, tag)] = (directives, len(stream), strip) |
1 | 809 |
182
41db0260ebb1
Renamed `Attributes` to `Attrs` to reduce the verbosity.
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181
diff
changeset
|
810 stream.append((kind, (tag, Attrs(new_attrib)), pos)) |
1 | 811 depth += 1 |
812 | |
69 | 813 elif kind is END: |
1 | 814 depth -= 1 |
815 stream.append((kind, data, pos)) | |
816 | |
817 # If there have have directive attributes with the corresponding | |
818 # start tag, move the events inbetween into a "subprogram" | |
819 if (depth, data) in dirmap: | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
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|
820 directives, start_offset, strip = dirmap.pop((depth, data)) |
1 | 821 substream = stream[start_offset:] |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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parents:
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diff
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|
822 if strip: |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
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61
diff
changeset
|
823 substream = substream[1:-1] |
69 | 824 stream[start_offset:] = [(SUB, (directives, substream), |
825 pos)] | |
1 | 826 |
69 | 827 elif kind is TEXT: |
1 | 828 for kind, data, pos in self._interpolate(data, *pos): |
829 stream.append((kind, data, pos)) | |
830 | |
89
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
831 elif kind is COMMENT: |
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
parents:
87
diff
changeset
|
832 if not data.lstrip().startswith('!'): |
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
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diff
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|
833 stream.append((kind, data, pos)) |
d4c7617900e3
Support comments in templates that are not included in the output, in the same way Kid does: if the comment text starts with a `!` character, it is stripped from the output.
cmlenz
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87
diff
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|
834 |
1 | 835 else: |
836 stream.append((kind, data, pos)) | |
837 | |
838 self.stream = stream | |
839 | |
184
e27a48802987
Interpolate multiline expressions in templates. Thanks to Christian Boos for reporting the problem and providing the fix.
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diff
changeset
|
840 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}', re.DOTALL) |
1 | 841 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') |
842 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
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18
diff
changeset
|
843 def _interpolate(cls, text, filename=None, lineno=-1, offset=-1): |
1 | 844 """Parse the given string and extract expressions. |
845 | |
846 This method returns a list containing both literal text and `Expression` | |
847 objects. | |
14
76b5d4b189e6
The `<py:match>` directive now protects itself against simple infinite recursion (see MatchDirective), while still allowing recursion in general.
cmlenz
parents:
13
diff
changeset
|
848 |
1 | 849 @param text: the text to parse |
850 @param lineno: the line number at which the text was found (optional) | |
851 @param offset: the column number at which the text starts in the source | |
852 (optional) | |
853 """ | |
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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diff
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854 def _interpolate(text, patterns, filename=filename, lineno=lineno, |
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
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|
855 offset=offset): |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
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190
diff
changeset
|
856 for idx, grp in enumerate(patterns.pop(0).split(text)): |
1 | 857 if idx % 2: |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
858 try: |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
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diff
changeset
|
859 yield EXPR, Expression(grp.strip(), filename, lineno), \ |
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
860 (filename, lineno, offset) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
861 except SyntaxError, err: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
862 raise TemplateSyntaxError(err, filename, lineno, |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
863 offset + (err.offset or 0)) |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
864 elif grp: |
1 | 865 if patterns: |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
866 for result in _interpolate(grp, patterns[:]): |
1 | 867 yield result |
868 else: | |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
869 yield TEXT, grp.replace('$$', '$'), \ |
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
870 (filename, lineno, offset) |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
871 if '\n' in grp: |
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
872 lines = grp.splitlines() |
134
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
873 lineno += len(lines) - 1 |
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
874 offset += len(lines[-1]) |
df44110ca91d
* Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents:
133
diff
changeset
|
875 else: |
191
929ef2913b87
Allow leading whitespace in expressions. Closes #38. Thanks to Christian Boos for the patch!
cmlenz
parents:
190
diff
changeset
|
876 offset += len(grp) |
74
3c271699c398
Fix expression interpolation where both shorthand notation and full notation are used inside a single text node. Thanks Jonas.
cmlenz
parents:
73
diff
changeset
|
877 return _interpolate(text, [cls._FULL_EXPR_RE, cls._SHORT_EXPR_RE]) |
1 | 878 _interpolate = classmethod(_interpolate) |
879 | |
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
880 def generate(self, *args, **kwargs): |
29
4b6cee37ce62
* 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
|
881 """Apply the template to the given context data. |
4b6cee37ce62
* 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
|
882 |
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
883 Any keyword arguments are made available to the template as context |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
884 data. |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
885 |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
886 Only one positional argument is accepted: if it is provided, it must be |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
887 an instance of the `Context` class, and keyword arguments are ignored. |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
888 This calling style is used for internal processing. |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
889 |
29
4b6cee37ce62
* 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
|
890 @return: a markup event stream representing the result of applying |
4b6cee37ce62
* 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
|
891 the template to the context data. |
4b6cee37ce62
* 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
|
892 """ |
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
893 if args: |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
894 assert len(args) == 1 |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
895 ctxt = args[0] |
173 | 896 if ctxt is None: |
897 ctxt = Context(**kwargs) | |
149
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
898 assert isinstance(ctxt, Context) |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
899 else: |
7306bf730ff3
`Template.generate()` now accepts the context data as keyword arguments, so that you don't have to import the `Context` class every time you want to pass data into a template.
cmlenz
parents:
145
diff
changeset
|
900 ctxt = Context(**kwargs) |
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
parents:
14
diff
changeset
|
901 |
69 | 902 stream = self.stream |
903 for filter_ in [self._eval, self._match, self._flatten] + self.filters: | |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
904 stream = filter_(iter(stream), ctxt) |
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
905 return Stream(stream) |
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
parents:
14
diff
changeset
|
906 |
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
|
907 def _eval(self, stream, ctxt=None): |
29
4b6cee37ce62
* 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
|
908 """Internal stream filter that evaluates any expressions in `START` and |
4b6cee37ce62
* 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
|
909 `TEXT` events. |
4b6cee37ce62
* 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
|
910 """ |
172
4b4e80b2b0b5
Fix for #30 (trouble using `py:def`inside a match template)
cmlenz
parents:
166
diff
changeset
|
911 filters = (self._eval, self._match, self._flatten) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
912 |
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
parents:
14
diff
changeset
|
913 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
|
914 |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
915 if kind is START and data[1]: |
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
parents:
14
diff
changeset
|
916 # 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
|
917 # 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
|
918 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
|
919 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
|
920 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
|
921 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
|
922 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
|
923 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
|
924 values = [] |
185
8e5a3048b359
Fix for #34: `py:def` macros can now be invoked from within expressions in attribute values.
cmlenz
parents:
184
diff
changeset
|
925 for subkind, subdata, subpos in self._eval(substream, |
8e5a3048b359
Fix for #34: `py:def` macros can now be invoked from within expressions in attribute values.
cmlenz
parents:
184
diff
changeset
|
926 ctxt): |
8e5a3048b359
Fix for #34: `py:def` macros can now be invoked from within expressions in attribute values.
cmlenz
parents:
184
diff
changeset
|
927 if subkind is TEXT: |
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
parents:
14
diff
changeset
|
928 values.append(subdata) |
185
8e5a3048b359
Fix for #34: `py:def` macros can now be invoked from within expressions in attribute values.
cmlenz
parents:
184
diff
changeset
|
929 value = [x for x in values if x is not None] |
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
parents:
14
diff
changeset
|
930 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
|
931 continue |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
932 new_attrib.append((name, u''.join(value))) |
182
41db0260ebb1
Renamed `Attributes` to `Attrs` to reduce the verbosity.
cmlenz
parents:
181
diff
changeset
|
933 yield kind, (tag, Attrs(new_attrib)), pos |
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
parents:
14
diff
changeset
|
934 |
69 | 935 elif kind is EXPR: |
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
parents:
14
diff
changeset
|
936 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
|
937 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
|
938 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
|
939 |
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
|
940 # 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
|
941 # 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
|
942 # 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
|
943 if isinstance(result, basestring): |
69 | 944 yield TEXT, result, pos |
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
parents:
14
diff
changeset
|
945 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
|
946 # 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
|
947 # 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
|
948 try: |
111
8a4d9064f363
Some fixes and more unit tests for the XPath engine.
cmlenz
parents:
104
diff
changeset
|
949 substream = _ensure(result) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
950 for filter_ in filters: |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
951 substream = filter_(substream, ctxt) |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
952 for event in substream: |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
953 yield event |
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
parents:
14
diff
changeset
|
954 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
|
955 # 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
|
956 # through |
69 | 957 yield TEXT, unicode(result), pos |
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
parents:
14
diff
changeset
|
958 |
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
|
959 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
|
960 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
|
961 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
962 def _flatten(self, stream, ctxt=None): |
29
4b6cee37ce62
* 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
|
963 """Internal stream filter that expands `SUB` events in the stream.""" |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
964 for kind, data, pos in stream: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
965 if kind is SUB: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
966 # This event is a list of directives and a list of nested |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
967 # events to which those directives should be applied |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
968 directives, substream = data |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
969 substream = _apply_directives(substream, ctxt, directives) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
970 for filter_ in (self._eval, self._match, self._flatten): |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
971 substream = filter_(substream, ctxt) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
972 for event in substream: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
973 yield event |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
974 else: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
975 yield kind, data, pos |
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
parents:
14
diff
changeset
|
976 |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
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|
977 def _match(self, stream, ctxt=None, match_templates=None): |
29
4b6cee37ce62
* 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
|
978 """Internal stream filter that applies any defined match templates |
4b6cee37ce62
* 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
|
979 to the stream. |
4b6cee37ce62
* 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
|
980 """ |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
981 if match_templates is None: |
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
982 match_templates = ctxt._match_templates |
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
983 |
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
parents:
14
diff
changeset
|
984 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
|
985 |
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
|
986 # 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
|
987 # We might care about namespace events in the future, though |
92
3b75c6730b29
More performance improvements... this time for whitespace normalization and template loops.
cmlenz
parents:
90
diff
changeset
|
988 if not match_templates or kind not in (START, END): |
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
parents:
14
diff
changeset
|
989 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.
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parents:
14
diff
changeset
|
990 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
|
991 |
50
a053ffb834cb
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
parents:
48
diff
changeset
|
992 for idx, (test, path, template, directives) in \ |
a053ffb834cb
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
parents:
48
diff
changeset
|
993 enumerate(match_templates): |
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
parents:
14
diff
changeset
|
994 |
179
a2e0a7986d19
Implemented support for XPath variables in predicates (#31).
cmlenz
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176
diff
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|
995 if test(kind, data, pos, ctxt) is True: |
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
parents:
14
diff
changeset
|
996 # Consume and store all events until an end 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
|
997 # corresponding to this start event is encountered |
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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parents:
14
diff
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|
998 content = [(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
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|
999 depth = 1 |
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
|
1000 while depth > 0: |
73 | 1001 kind, data, pos = stream.next() |
1002 if kind is START: | |
1003 depth += 1 | |
1004 elif kind is END: | |
1005 depth -= 1 | |
1006 content.append((kind, data, pos)) | |
179
a2e0a7986d19
Implemented support for XPath variables in predicates (#31).
cmlenz
parents:
176
diff
changeset
|
1007 test(kind, data, pos, ctxt) |
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
parents:
14
diff
changeset
|
1008 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
1009 content = list(self._flatten(content, ctxt)) |
95
7d6426183a90
Improve performance of push/pop operations on the context.
cmlenz
parents:
93
diff
changeset
|
1010 select = lambda path: Stream(content).select(path) |
7d6426183a90
Improve performance of push/pop operations on the context.
cmlenz
parents:
93
diff
changeset
|
1011 ctxt.push(dict(select=select)) |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
1012 |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
1013 template = _apply_directives(template, ctxt, directives) |
69 | 1014 for event in self._match(self._eval(template, ctxt), |
1015 ctxt, match_templates[:idx] + | |
1016 match_templates[idx + 1:]): | |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
1017 yield event |
116 | 1018 |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
1019 ctxt.pop() |
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
parents:
14
diff
changeset
|
1020 break |
69 | 1021 |
1022 else: # no matches | |
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
parents:
14
diff
changeset
|
1023 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
|
1024 |
1 | 1025 |
69 | 1026 EXPR = Template.EXPR |
1027 SUB = Template.SUB | |
1028 | |
1029 | |
1 | 1030 class TemplateLoader(object): |
1031 """Responsible for loading templates from files on the specified search | |
1032 path. | |
1033 | |
1034 >>> import tempfile | |
1035 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
1036 >>> os.write(fd, '<p>$var</p>') | |
1037 11 | |
1038 >>> os.close(fd) | |
1039 | |
1040 The template loader accepts a list of directory paths that are then used | |
1041 when searching for template files, in the given order: | |
1042 | |
1043 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
1044 | |
1045 The `load()` method first checks the template cache whether the requested | |
1046 template has already been loaded. If not, it attempts to locate the | |
1047 template file, and returns the corresponding `Template` object: | |
1048 | |
1049 >>> template = loader.load(os.path.basename(path)) | |
1050 >>> isinstance(template, Template) | |
1051 True | |
1052 | |
1053 Template instances are cached: requesting a template with the same name | |
1054 results in the same instance being returned: | |
1055 | |
1056 >>> loader.load(os.path.basename(path)) is template | |
1057 True | |
152
064ba1078f92
Add some tests for relative template includes (see #27).
cmlenz
parents:
150
diff
changeset
|
1058 |
064ba1078f92
Add some tests for relative template includes (see #27).
cmlenz
parents:
150
diff
changeset
|
1059 >>> os.remove(path) |
1 | 1060 """ |
1061 def __init__(self, search_path=None, auto_reload=False): | |
1062 """Create the template laoder. | |
1063 | |
1064 @param search_path: a list of absolute path names that should be | |
1065 searched for template files | |
1066 @param auto_reload: whether to check the last modification time of | |
1067 template files, and reload them if they have changed | |
1068 """ | |
1069 self.search_path = search_path | |
1070 if self.search_path is None: | |
1071 self.search_path = [] | |
1072 self.auto_reload = auto_reload | |
1073 self._cache = {} | |
1074 self._mtime = {} | |
1075 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1076 def load(self, filename, relative_to=None): |
1 | 1077 """Load the template with the given name. |
1078 | |
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1079 If the `filename` parameter is relative, this method searches the search |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1080 path trying to locate a template matching the given name. If the file |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1081 name is an absolute path, the search path is not bypassed. |
1 | 1082 |
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1083 If requested template is not found, a `TemplateNotFound` exception is |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1084 raised. Otherwise, a `Template` object is returned that represents the |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1085 parsed template. |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1086 |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1087 Template instances are cached to avoid having to parse the same |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1088 template file more than once. Thus, subsequent calls of this method |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1089 with the same template file name will return the same `Template` |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1090 object (unless the `auto_reload` option is enabled and the file was |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1091 changed since the last parse.) |
1 | 1092 |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1093 If the `relative_to` parameter is provided, the `filename` is |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1094 interpreted as being relative to that path. |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1095 |
1 | 1096 @param filename: the relative path of the template file to load |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1097 @param relative_to: the filename of the template from which the new |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1098 template is being loaded, or `None` if the template is being loaded |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1099 directly |
1 | 1100 """ |
69 | 1101 from markup.filters import IncludeFilter |
1102 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1103 if relative_to: |
153 | 1104 filename = os.path.join(os.path.dirname(relative_to), filename) |
1 | 1105 filename = os.path.normpath(filename) |
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1106 |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1107 # First check the cache to avoid reparsing the same file |
1 | 1108 try: |
1109 tmpl = self._cache[filename] | |
1110 if not self.auto_reload or \ | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1111 os.path.getmtime(tmpl.filepath) == self._mtime[filename]: |
1 | 1112 return tmpl |
1113 except KeyError: | |
1114 pass | |
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1115 |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1116 # Bypass the search path if the filename is absolute |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1117 search_path = self.search_path |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1118 if os.path.isabs(filename): |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1119 search_path = [os.path.dirname(filename)] |
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1120 |
176
7efcbf6b1cf2
Fix control flow for error message when template search path is empty.
cmlenz
parents:
175
diff
changeset
|
1121 if not search_path: |
7efcbf6b1cf2
Fix control flow for error message when template search path is empty.
cmlenz
parents:
175
diff
changeset
|
1122 raise TemplateError('Search path for templates not configured') |
7efcbf6b1cf2
Fix control flow for error message when template search path is empty.
cmlenz
parents:
175
diff
changeset
|
1123 |
22
31b13ddf9f53
Fix for the template engine plugin: the search path is now ignored if the requested template path is absolute.
cmlenz
parents:
21
diff
changeset
|
1124 for dirname in search_path: |
1 | 1125 filepath = os.path.join(dirname, filename) |
1126 try: | |
133
b9a0031d4bbb
Minor cleanup and performance improvement for the builder module.
cmlenz
parents:
120
diff
changeset
|
1127 fileobj = open(filepath, 'U') |
1 | 1128 try: |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1129 tmpl = Template(fileobj, basedir=dirname, filename=filename) |
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
parents:
14
diff
changeset
|
1130 tmpl.filters.append(IncludeFilter(self)) |
1 | 1131 finally: |
1132 fileobj.close() | |
1133 self._cache[filename] = tmpl | |
1134 self._mtime[filename] = os.path.getmtime(filepath) | |
1135 return tmpl | |
1136 except IOError: | |
1137 continue | |
175 | 1138 |
1 | 1139 raise TemplateNotFound(filename, self.search_path) |