Mercurial > genshi > genshi-test
annotate markup/template.py @ 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.
author | cmlenz |
---|---|
date | Mon, 17 Jul 2006 23:10:35 +0000 |
parents | c6f07b7cd3ea |
children | 242610137d1f |
rev | line source |
---|---|
1 | 1 # -*- coding: utf-8 -*- |
2 # | |
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents:
65
diff
changeset
|
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 | |
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents:
65
diff
changeset
|
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 | |
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents:
65
diff
changeset
|
12 # history and logs, available at http://markup.edgewall.org/log/. |
1 | 13 |
82 | 14 """Implementation of the template engine.""" |
1 | 15 |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
16 try: |
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
17 from collections import deque |
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
18 except ImportError: |
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
19 class deque(list): |
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
20 def appendleft(self, x): self.insert(0, x) |
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
21 def popleft(self): return self.pop(0) |
1 | 22 import compiler |
23 import os | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
24 import posixpath |
1 | 25 import re |
26 from StringIO import StringIO | |
27 | |
18
4cbebb15a834
Actually make use of the `markup.core.Namespace` class, and add a couple of doctests.
cmlenz
parents:
17
diff
changeset
|
28 from markup.core import Attributes, Namespace, Stream, StreamEventKind |
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
|
29 from markup.core import START, END, START_NS, END_NS, TEXT, COMMENT |
1 | 30 from markup.eval import Expression |
69 | 31 from markup.input import XMLParser |
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
|
32 from markup.path import Path |
1 | 33 |
34 __all__ = ['Context', 'BadDirectiveError', 'TemplateError', | |
35 'TemplateSyntaxError', 'TemplateNotFound', 'Template', | |
36 'TemplateLoader'] | |
37 | |
38 | |
39 class TemplateError(Exception): | |
40 """Base exception class for errors related to template processing.""" | |
41 | |
42 | |
43 class TemplateSyntaxError(TemplateError): | |
44 """Exception raised when an expression in a template causes a Python syntax | |
45 error.""" | |
46 | |
47 def __init__(self, message, filename='<string>', lineno=-1, offset=-1): | |
48 if isinstance(message, SyntaxError) and message.lineno is not None: | |
49 message = str(message).replace(' (line %d)' % message.lineno, '') | |
80 | 50 message = '%s (%s, line %d)' % (message, filename, lineno) |
1 | 51 TemplateError.__init__(self, message) |
52 self.filename = filename | |
53 self.lineno = lineno | |
54 self.offset = offset | |
55 | |
56 | |
57 class BadDirectiveError(TemplateSyntaxError): | |
58 """Exception raised when an unknown directive is encountered when parsing | |
59 a template. | |
60 | |
61 An unknown directive is any attribute using the namespace for directives, | |
62 with a local name that doesn't match any registered directive. | |
63 """ | |
64 | |
65 def __init__(self, name, filename='<string>', lineno=-1): | |
80 | 66 msg = 'bad directive "%s" (%s, line %d)' % (name.localname, filename, |
67 lineno) | |
68 TemplateSyntaxError.__init__(self, msg, filename, lineno) | |
1 | 69 |
70 | |
71 class TemplateNotFound(TemplateError): | |
72 """Exception raised when a specific template file could not be found.""" | |
73 | |
74 def __init__(self, name, search_path): | |
75 TemplateError.__init__(self, 'Template "%s" not found' % name) | |
76 self.search_path = search_path | |
77 | |
78 | |
79 class Context(object): | |
80 """A container for template input data. | |
81 | |
82 A context provides a stack of scopes. Template directives such as loops can | |
83 push a new scope on the stack with data that should only be available | |
84 inside the loop. When the loop terminates, that scope can get popped off | |
85 the stack again. | |
86 | |
87 >>> ctxt = Context(one='foo', other=1) | |
88 >>> ctxt.get('one') | |
89 'foo' | |
90 >>> ctxt.get('other') | |
91 1 | |
92 >>> ctxt.push(one='frost') | |
93 >>> ctxt.get('one') | |
94 'frost' | |
95 >>> ctxt.get('other') | |
96 1 | |
97 >>> ctxt.pop() | |
98 >>> ctxt.get('one') | |
99 'foo' | |
100 """ | |
101 | |
102 def __init__(self, **data): | |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
103 self.frames = deque([data]) |
1 | 104 |
105 def __repr__(self): | |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
106 return repr(self.frames) |
1 | 107 |
108 def __setitem__(self, key, value): | |
109 """Set a variable in the current context.""" | |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
110 self.frames[0][key] = value |
1 | 111 |
112 def get(self, key): | |
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
|
113 """Get a variable's value, starting at the current context frame 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
|
114 going upward. |
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
|
115 """ |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
116 for frame in self.frames: |
1 | 117 if key in frame: |
118 return frame[key] | |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
119 __getitem__ = get |
1 | 120 |
121 def push(self, **data): | |
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
|
122 """Push a new context frame on the stack.""" |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
123 self.frames.appendleft(data) |
1 | 124 |
125 def pop(self): | |
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
|
126 """Pop the top-most context frame from the stack. |
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
|
127 |
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
|
128 If the stack is empty, an `AssertionError` is raised. |
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
|
129 """ |
71
0334bca326df
Add back line that was accidentially left commented out in [75].
cmlenz
parents:
70
diff
changeset
|
130 assert self.frames, 'Pop from empty context stack' |
70
0498da8e5de7
Use `collections.deque` for the template context stack on Python 2.4, which improves performance if there are many context frame pop/push operations.
cmlenz
parents:
69
diff
changeset
|
131 self.frames.popleft() |
1 | 132 |
133 | |
134 class Directive(object): | |
135 """Abstract base class for template directives. | |
136 | |
54 | 137 A directive is basically a callable that takes three positional arguments: |
138 `ctxt` is the template data context, `stream` is an iterable over the | |
139 events that the directive applies to, and `directives` is is a list of | |
140 other directives on the same stream that need to be applied. | |
1 | 141 |
142 Directives can be "anonymous" or "registered". Registered directives can be | |
143 applied by the template author using an XML attribute with the | |
144 corresponding name in the template. Such directives should be subclasses of | |
31 | 145 this base class that can be instantiated with the value of the directive |
146 attribute as parameter. | |
1 | 147 |
148 Anonymous directives are simply functions conforming to the protocol | |
149 described above, and can only be applied programmatically (for example by | |
150 template filters). | |
151 """ | |
152 __slots__ = ['expr'] | |
153 | |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
154 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
155 try: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
156 self.expr = value and Expression(value, filename, lineno) or None |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
157 except SyntaxError, err: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
158 raise TemplateSyntaxError(err, filename, lineno, |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
159 offset + (err.offset or 0)) |
1 | 160 |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
161 def __call__(self, stream, ctxt, directives): |
1 | 162 raise NotImplementedError |
163 | |
164 def __repr__(self): | |
165 expr = '' | |
166 if self.expr is not None: | |
167 expr = ' "%s"' % self.expr.source | |
168 return '<%s%s>' % (self.__class__.__name__, expr) | |
169 | |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
170 |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
171 def _apply_directives(stream, ctxt, directives): |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
172 if directives: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
173 stream = directives[0](iter(stream), ctxt, directives[1:]) |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
174 return stream |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
175 |
1 | 176 |
177 class AttrsDirective(Directive): | |
178 """Implementation of the `py:attrs` template directive. | |
179 | |
180 The value of the `py:attrs` attribute should be a dictionary. The keys and | |
181 values of that dictionary will be added as attributes to the element: | |
182 | |
183 >>> ctxt = Context(foo={'class': 'collapse'}) | |
61 | 184 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 185 ... <li py:attrs="foo">Bar</li> |
186 ... </ul>''') | |
187 >>> print tmpl.generate(ctxt) | |
188 <ul> | |
189 <li class="collapse">Bar</li> | |
190 </ul> | |
191 | |
192 If the value evaluates to `None` (or any other non-truth value), no | |
193 attributes are added: | |
194 | |
195 >>> ctxt = Context(foo=None) | |
196 >>> print tmpl.generate(ctxt) | |
197 <ul> | |
198 <li>Bar</li> | |
199 </ul> | |
200 """ | |
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
|
201 __slots__ = [] |
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
|
202 |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
203 def __call__(self, stream, ctxt, directives): |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
204 def _generate(): |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
205 kind, (tag, attrib), pos = stream.next() |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
206 attrs = self.expr.evaluate(ctxt) |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
207 if attrs: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
208 attrib = Attributes(attrib[:]) |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
209 if isinstance(attrs, Stream): |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
210 try: |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
211 attrs = iter(attrs).next() |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
212 except StopIteration: |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
213 attrs = [] |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
214 elif not isinstance(attrs, list): # assume it's a dict |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
215 attrs = attrs.items() |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
216 for name, value in attrs: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
217 if value is None: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
218 attrib.remove(name) |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
219 else: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
220 attrib.set(name, unicode(value).strip()) |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
221 yield kind, (tag, attrib), pos |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
222 for event in stream: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
223 yield event |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
224 |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
225 return _apply_directives(_generate(), ctxt, directives) |
1 | 226 |
227 | |
228 class ContentDirective(Directive): | |
229 """Implementation of the `py:content` template directive. | |
230 | |
231 This directive replaces the content of the element with the result of | |
232 evaluating the value of the `py:content` attribute: | |
233 | |
234 >>> ctxt = Context(bar='Bye') | |
61 | 235 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 236 ... <li py:content="bar">Hello</li> |
237 ... </ul>''') | |
238 >>> print tmpl.generate(ctxt) | |
239 <ul> | |
240 <li>Bye</li> | |
241 </ul> | |
242 """ | |
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
|
243 __slots__ = [] |
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
|
244 |
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
|
245 def __call__(self, stream, ctxt, directives): |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
246 def _generate(): |
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
|
247 kind, data, pos = stream.next() |
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
|
248 if kind is Stream.START: |
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
|
249 yield kind, data, pos # emit start tag |
69 | 250 yield EXPR, self.expr, pos |
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
|
251 previous = stream.next() |
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
|
252 for event in stream: |
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
|
253 previous = event |
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
|
254 if previous is not None: |
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
|
255 yield previous |
87
c6f07b7cd3ea
Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents:
82
diff
changeset
|
256 |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
257 return _apply_directives(_generate(), ctxt, directives) |
1 | 258 |
259 | |
260 class DefDirective(Directive): | |
261 """Implementation of the `py:def` template directive. | |
262 | |
263 This directive can be used to create "Named Template Functions", which | |
264 are template snippets that are not actually output during normal | |
265 processing, but rather can be expanded from expressions in other places | |
266 in the template. | |
267 | |
268 A named template function can be used just like a normal Python function | |
269 from template expressions: | |
270 | |
271 >>> ctxt = Context(bar='Bye') | |
61 | 272 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 273 ... <p py:def="echo(greeting, name='world')" class="message"> |
274 ... ${greeting}, ${name}! | |
275 ... </p> | |
276 ... ${echo('hi', name='you')} | |
277 ... </div>''') | |
278 >>> print tmpl.generate(ctxt) | |
279 <div> | |
280 <p class="message"> | |
281 hi, you! | |
282 </p> | |
283 </div> | |
284 | |
285 >>> ctxt = Context(bar='Bye') | |
61 | 286 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 287 ... <p py:def="echo(greeting, name='world')" class="message"> |
288 ... ${greeting}, ${name}! | |
289 ... </p> | |
290 ... <div py:replace="echo('hello')"></div> | |
291 ... </div>''') | |
292 >>> print tmpl.generate(ctxt) | |
293 <div> | |
294 <p class="message"> | |
295 hello, world! | |
296 </p> | |
297 </div> | |
298 """ | |
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
|
299 __slots__ = ['name', 'args', 'defaults', 'stream', 'directives'] |
1 | 300 |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
301 ATTRIBUTE = 'function' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
302 |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
303 def __init__(self, args, filename=None, lineno=-1, offset=-1): |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
304 Directive.__init__(self, None, filename, lineno, offset) |
1 | 305 ast = compiler.parse(args, 'eval').node |
306 self.args = [] | |
307 self.defaults = {} | |
308 if isinstance(ast, compiler.ast.CallFunc): | |
309 self.name = ast.node.name | |
310 for arg in ast.args: | |
311 if isinstance(arg, compiler.ast.Keyword): | |
312 self.args.append(arg.name) | |
313 self.defaults[arg.name] = arg.expr.value | |
314 else: | |
315 self.args.append(arg.name) | |
316 else: | |
317 self.name = ast.name | |
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
|
318 self.stream, self.directives = [], [] |
1 | 319 |
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
|
320 def __call__(self, stream, ctxt, directives): |
1 | 321 self.stream = list(stream) |
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
|
322 self.directives = directives |
1 | 323 ctxt[self.name] = lambda *args, **kwargs: self._exec(ctxt, *args, |
324 **kwargs) | |
325 return [] | |
326 | |
327 def _exec(self, ctxt, *args, **kwargs): | |
328 scope = {} | |
329 args = list(args) # make mutable | |
330 for name in self.args: | |
331 if args: | |
332 scope[name] = args.pop(0) | |
333 else: | |
334 scope[name] = kwargs.pop(name, self.defaults.get(name)) | |
335 ctxt.push(**scope) | |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
336 for event in _apply_directives(self.stream, ctxt, self.directives): |
1 | 337 yield event |
338 ctxt.pop() | |
339 | |
340 | |
341 class ForDirective(Directive): | |
31 | 342 """Implementation of the `py:for` template directive for repeating an |
343 element based on an iterable in the context data. | |
1 | 344 |
345 >>> ctxt = Context(items=[1, 2, 3]) | |
61 | 346 >>> tmpl = Template('''<ul xmlns:py="http://markup.edgewall.org/"> |
1 | 347 ... <li py:for="item in items">${item}</li> |
348 ... </ul>''') | |
349 >>> print tmpl.generate(ctxt) | |
350 <ul> | |
351 <li>1</li><li>2</li><li>3</li> | |
352 </ul> | |
353 """ | |
354 __slots__ = ['targets'] | |
355 | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
356 ATTRIBUTE = 'each' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
357 |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
358 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
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
|
359 targets, value = value.split(' in ', 1) |
1 | 360 self.targets = [str(name.strip()) for name in targets.split(',')] |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
361 Directive.__init__(self, value, filename, lineno, offset) |
1 | 362 |
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
|
363 def __call__(self, stream, ctxt, directives): |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
364 iterable = self.expr.evaluate(ctxt) |
1 | 365 if iterable is not None: |
366 stream = list(stream) | |
367 for item in iter(iterable): | |
368 if len(self.targets) == 1: | |
369 item = [item] | |
370 scope = {} | |
371 for idx, name in enumerate(self.targets): | |
372 scope[name] = item[idx] | |
373 ctxt.push(**scope) | |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
374 for event in _apply_directives(stream, ctxt, directives): |
1 | 375 yield event |
376 ctxt.pop() | |
377 | |
378 def __repr__(self): | |
379 return '<%s "%s in %s">' % (self.__class__.__name__, | |
380 ', '.join(self.targets), self.expr.source) | |
381 | |
382 | |
383 class IfDirective(Directive): | |
31 | 384 """Implementation of the `py:if` template directive for conditionally |
385 excluding elements from being output. | |
1 | 386 |
387 >>> ctxt = Context(foo=True, bar='Hello') | |
61 | 388 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 389 ... <b py:if="foo">${bar}</b> |
390 ... </div>''') | |
391 >>> print tmpl.generate(ctxt) | |
392 <div> | |
393 <b>Hello</b> | |
394 </div> | |
395 """ | |
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
|
396 __slots__ = [] |
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
|
397 |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
398 ATTRIBUTE = 'test' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
399 |
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
|
400 def __call__(self, stream, ctxt, directives): |
1 | 401 if self.expr.evaluate(ctxt): |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
402 return _apply_directives(stream, ctxt, directives) |
1 | 403 return [] |
404 | |
405 | |
406 class MatchDirective(Directive): | |
407 """Implementation of the `py:match` template directive. | |
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
|
408 |
61 | 409 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
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
|
410 ... <span py:match="greeting"> |
1 | 411 ... Hello ${select('@name')} |
412 ... </span> | |
413 ... <greeting name="Dude" /> | |
414 ... </div>''') | |
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
|
415 >>> print tmpl.generate() |
1 | 416 <div> |
417 <span> | |
418 Hello Dude | |
419 </span> | |
420 </div> | |
421 """ | |
422 __slots__ = ['path', 'stream'] | |
423 | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
424 ATTRIBUTE = 'path' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
425 |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
426 def __init__(self, value, filename=None, lineno=-1, offset=-1): |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
427 Directive.__init__(self, None, filename, lineno, offset) |
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
|
428 self.path = Path(value) |
1 | 429 self.stream = [] |
430 | |
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
|
431 def __call__(self, stream, ctxt, directives): |
1 | 432 self.stream = list(stream) |
38
fec9f4897415
Fix for #2 (incorrect context node in path expressions). Still some paths that produce incorrect results, but the common case seems to work now.
cmlenz
parents:
37
diff
changeset
|
433 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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
|
434 self.path, self.stream, directives)) |
1 | 435 return [] |
436 | |
437 def __repr__(self): | |
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
|
438 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
1 | 439 |
440 | |
441 class ReplaceDirective(Directive): | |
442 """Implementation of the `py:replace` template directive. | |
443 | |
31 | 444 This directive replaces the element with the result of evaluating the |
445 value of the `py:replace` attribute: | |
446 | |
1 | 447 >>> ctxt = Context(bar='Bye') |
61 | 448 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 449 ... <span py:replace="bar">Hello</span> |
450 ... </div>''') | |
451 >>> print tmpl.generate(ctxt) | |
452 <div> | |
453 Bye | |
454 </div> | |
455 | |
456 This directive is equivalent to `py:content` combined with `py:strip`, | |
457 providing a less verbose way to achieve the same effect: | |
458 | |
459 >>> ctxt = Context(bar='Bye') | |
61 | 460 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 461 ... <span py:content="bar" py:strip="">Hello</span> |
462 ... </div>''') | |
463 >>> print tmpl.generate(ctxt) | |
464 <div> | |
465 Bye | |
466 </div> | |
467 """ | |
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
|
468 __slots__ = [] |
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
|
469 |
54 | 470 def __call__(self, stream, ctxt, directives): |
1 | 471 kind, data, pos = stream.next() |
69 | 472 yield EXPR, self.expr, pos |
1 | 473 |
474 | |
475 class StripDirective(Directive): | |
476 """Implementation of the `py:strip` template directive. | |
477 | |
478 When the value of the `py:strip` attribute evaluates to `True`, the element | |
479 is stripped from the output | |
480 | |
61 | 481 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 482 ... <div py:strip="True"><b>foo</b></div> |
483 ... </div>''') | |
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
|
484 >>> print tmpl.generate() |
1 | 485 <div> |
486 <b>foo</b> | |
487 </div> | |
488 | |
37
224b0b41d1da
Moved some of the tests for the strip directive to a new unittest test case to not clutter up the documentation.
cmlenz
parents:
36
diff
changeset
|
489 Leaving the attribute value empty is equivalent to a truth value. |
1 | 490 |
491 This directive is particulary interesting for named template functions or | |
492 match templates that do not generate a top-level element: | |
493 | |
61 | 494 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/"> |
1 | 495 ... <div py:def="echo(what)" py:strip=""> |
496 ... <b>${what}</b> | |
497 ... </div> | |
498 ... ${echo('foo')} | |
499 ... </div>''') | |
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
|
500 >>> print tmpl.generate() |
1 | 501 <div> |
502 <b>foo</b> | |
503 </div> | |
504 """ | |
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
|
505 __slots__ = [] |
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
|
506 |
54 | 507 def __call__(self, stream, ctxt, directives): |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
508 def _generate(): |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
509 if self.expr: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
510 strip = self.expr.evaluate(ctxt) |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
511 else: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
512 strip = True |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
513 if strip: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
514 stream.next() # skip start tag |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
515 previous = stream.next() |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
516 for event in stream: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
517 yield previous |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
518 previous = event |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
519 else: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
520 for event in stream: |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
521 yield event |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
522 |
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
523 return _apply_directives(_generate(), ctxt, directives) |
1 | 524 |
525 | |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
526 class ChooseDirective(Directive): |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
527 """Implementation of the `py:choose` directive for conditionally selecting |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
528 one of several body elements to display. |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
529 |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
530 If the `py:choose` expression is empty the expressions of nested `py:when` |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
531 directives are tested for truth. The first true `py:when` body is output. |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
532 If no `py:when` directive is matched then the fallback directive |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
533 `py:otherwise` will be used. |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
534 |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
535 >>> ctxt = Context() |
61 | 536 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
537 ... py:choose=""> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
538 ... <span py:when="0 == 1">0</span> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
539 ... <span py:when="1 == 1">1</span> |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
540 ... <span py:otherwise="">2</span> |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
541 ... </div>''') |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
542 >>> print tmpl.generate(ctxt) |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
543 <div> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
544 <span>1</span> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
545 </div> |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
546 |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
547 If the `py:choose` directive contains an expression, the nested `py:when` |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
548 directives are tested for equality to the `py:choose` expression: |
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
549 |
61 | 550 >>> tmpl = Template('''<div xmlns:py="http://markup.edgewall.org/" |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
551 ... py:choose="2"> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
552 ... <span py:when="1">1</span> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
553 ... <span py:when="2">2</span> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
554 ... </div>''') |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
555 >>> print tmpl.generate(ctxt) |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
556 <div> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
557 <span>2</span> |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
558 </div> |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
559 |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
560 Behavior is undefined if a `py:choose` block contains content outside a |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
561 `py:when` or `py:otherwise` block. Behavior is also undefined if a |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
562 `py:otherwise` occurs before `py:when` blocks. |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
563 """ |
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
|
564 __slots__ = ['matched', 'value'] |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
565 |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
566 ATTRIBUTE = 'test' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
567 |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
568 def __call__(self, stream, ctxt, directives): |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
569 if self.expr: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
570 self.value = self.expr.evaluate(ctxt) |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
571 self.matched = False |
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
|
572 ctxt.push(_choose=self) |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
573 for event in _apply_directives(stream, ctxt, directives): |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
574 yield event |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
575 ctxt.pop() |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
576 |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
577 |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
578 class WhenDirective(Directive): |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
579 """Implementation of the `py:when` directive for nesting in a parent with |
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
|
580 the `py:choose` directive. |
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
|
581 |
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
|
582 See the documentation of `py:choose` for usage. |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
583 """ |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
584 |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
585 ATTRIBUTE = 'test' |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
586 |
54 | 587 def __call__(self, stream, ctxt, 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
|
588 choose = ctxt['_choose'] |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
589 if choose.matched: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
590 return [] |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
591 value = self.expr.evaluate(ctxt) |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
592 try: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
593 if value == choose.value: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
594 choose.matched = True |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
595 return _apply_directives(stream, ctxt, directives) |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
596 except AttributeError: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
597 if value: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
598 choose.matched = True |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
599 return _apply_directives(stream, ctxt, directives) |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
600 return [] |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
601 |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
602 |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
603 class OtherwiseDirective(Directive): |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
604 """Implementation of the `py:otherwise` directive for nesting in a parent |
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
|
605 with the `py:choose` directive. |
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
|
606 |
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
|
607 See the documentation of `py:choose` for usage. |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
608 """ |
54 | 609 def __call__(self, stream, ctxt, 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
|
610 choose = ctxt['_choose'] |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
611 if choose.matched: |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
612 return [] |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
613 choose.matched = True |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
614 return _apply_directives(stream, ctxt, directives) |
44
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
615 |
42bcb91bf025
implement `py:choose/when/otherwise` directives for conditionally selecting one of several blocks
mgood
parents:
38
diff
changeset
|
616 |
1 | 617 class Template(object): |
618 """Can parse a template and transform it into the corresponding output | |
619 based on context data. | |
620 """ | |
61 | 621 NAMESPACE = Namespace('http://markup.edgewall.org/') |
1 | 622 |
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
|
623 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.
cmlenz
parents:
14
diff
changeset
|
624 SUB = StreamEventKind('SUB') # a "subprogram" |
10
c5890ef863ba
Moved the template-specific stream event kinds into the template module.
cmlenz
parents:
6
diff
changeset
|
625 |
1 | 626 directives = [('def', DefDirective), |
627 ('match', MatchDirective), | |
628 ('for', ForDirective), | |
629 ('if', IfDirective), | |
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
|
630 ('when', WhenDirective), |
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
|
631 ('otherwise', OtherwiseDirective), |
53
60f1a556690e
* Add helper function to let directives apply any remaining directives, and use that helper consistently in every directive.
cmlenz
parents:
51
diff
changeset
|
632 ('choose', ChooseDirective), |
1 | 633 ('replace', ReplaceDirective), |
634 ('content', ContentDirective), | |
635 ('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
parents:
48
diff
changeset
|
636 ('strip', StripDirective)] |
1 | 637 _dir_by_name = dict(directives) |
638 _dir_order = [directive[1] for directive in directives] | |
639 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
640 def __init__(self, source, basedir=None, filename=None): |
1 | 641 """Initialize a template from either a string or a file-like object.""" |
642 if isinstance(source, basestring): | |
643 self.source = StringIO(source) | |
644 else: | |
645 self.source = source | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
646 self.basedir = basedir |
1 | 647 self.filename = filename or '<string>' |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
648 if basedir and filename: |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
649 self.filepath = os.path.join(basedir, filename) |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
650 else: |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
651 self.filepath = '<string>' |
1 | 652 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
653 self.filters = [] |
1 | 654 self.parse() |
655 | |
656 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
|
657 return '<%s "%s">' % (self.__class__.__name__, self.filename) |
1 | 658 |
659 def parse(self): | |
660 """Parse the template. | |
661 | |
662 The parsing stage parses the XML template and constructs a list of | |
663 directives that will be executed in the render stage. The input is | |
664 split up into literal output (markup that does not depend on the | |
665 context data) and actual directives (commands or variable | |
666 substitution). | |
667 """ | |
668 stream = [] # list of events of the "compiled" template | |
669 dirmap = {} # temporary mapping of directives to elements | |
670 ns_prefix = {} | |
671 depth = 0 | |
672 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
673 for kind, data, pos in XMLParser(self.source, filename=self.filename): |
1 | 674 |
69 | 675 if kind is START_NS: |
1 | 676 # Strip out the namespace declaration for template directives |
677 prefix, uri = data | |
678 if uri == self.NAMESPACE: | |
679 ns_prefix[prefix] = uri | |
680 else: | |
681 stream.append((kind, data, pos)) | |
682 | |
69 | 683 elif kind is END_NS: |
1 | 684 if data in ns_prefix: |
685 del ns_prefix[data] | |
686 else: | |
687 stream.append((kind, data, pos)) | |
688 | |
69 | 689 elif kind is START: |
1 | 690 # Record any directive attributes in start tags |
691 tag, attrib = data | |
692 directives = [] | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
693 strip = False |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
694 |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
695 if tag in self.NAMESPACE: |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
696 cls = self._dir_by_name.get(tag.localname) |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
697 if cls is None: |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
698 raise BadDirectiveError(tag, pos[0], pos[1]) |
66
822089ae65ce
Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents:
65
diff
changeset
|
699 value = attrib.get(getattr(cls, 'ATTRIBUTE', None), '') |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
700 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
changeset
|
701 strip = True |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
702 |
1 | 703 new_attrib = [] |
704 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
|
705 if name in self.NAMESPACE: |
1 | 706 cls = self._dir_by_name.get(name.localname) |
707 if cls is None: | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
708 raise BadDirectiveError(name, pos[0], pos[1]) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
709 directives.append(cls(value, *pos)) |
1 | 710 else: |
75
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
711 if value: |
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
712 value = list(self._interpolate(value, *pos)) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
713 if len(value) == 1 and value[0][0] is TEXT: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
714 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
|
715 else: |
c3c26300a46d
Empty attributes in templates were being stripped out. Thanks to Jonas for the patch.
cmlenz
parents:
74
diff
changeset
|
716 value = [(TEXT, u'', pos)] |
1 | 717 new_attrib.append((name, value)) |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
718 |
1 | 719 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
|
720 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:
48
diff
changeset
|
721 self._dir_order.index(b.__class__))) |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
722 dirmap[(depth, tag)] = (directives, len(stream), strip) |
1 | 723 |
724 stream.append((kind, (tag, Attributes(new_attrib)), pos)) | |
725 depth += 1 | |
726 | |
69 | 727 elif kind is END: |
1 | 728 depth -= 1 |
729 stream.append((kind, data, pos)) | |
730 | |
731 # If there have have directive attributes with the corresponding | |
732 # start tag, move the events inbetween into a "subprogram" | |
733 if (depth, data) in dirmap: | |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
734 directives, start_offset, strip = dirmap.pop((depth, data)) |
1 | 735 substream = stream[start_offset:] |
65
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
736 if strip: |
5c024cf58ecb
Support the use of directives as elements to reduce the need for using `py:strip`.
cmlenz
parents:
61
diff
changeset
|
737 substream = substream[1:-1] |
69 | 738 stream[start_offset:] = [(SUB, (directives, substream), |
739 pos)] | |
1 | 740 |
69 | 741 elif kind is TEXT: |
1 | 742 for kind, data, pos in self._interpolate(data, *pos): |
743 stream.append((kind, data, pos)) | |
744 | |
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
|
745 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
|
746 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
parents:
87
diff
changeset
|
747 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
parents:
87
diff
changeset
|
748 |
1 | 749 else: |
750 stream.append((kind, data, pos)) | |
751 | |
752 self.stream = stream | |
753 | |
754 _FULL_EXPR_RE = re.compile(r'(?<!\$)\$\{(.+?)\}') | |
755 _SHORT_EXPR_RE = re.compile(r'(?<!\$)\$([a-zA-Z][a-zA-Z0-9_\.]*)') | |
756 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
757 def _interpolate(cls, text, filename=None, lineno=-1, offset=-1): |
1 | 758 """Parse the given string and extract expressions. |
759 | |
760 This method returns a list containing both literal text and `Expression` | |
761 objects. | |
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
|
762 |
1 | 763 @param text: the text to parse |
764 @param lineno: the line number at which the text was found (optional) | |
765 @param offset: the column number at which the text starts in the source | |
766 (optional) | |
767 """ | |
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
|
768 def _interpolate(text, patterns): |
1 | 769 for idx, group in enumerate(patterns.pop(0).split(text)): |
770 if idx % 2: | |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
771 try: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
772 yield EXPR, Expression(group, filename, lineno), \ |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
773 (lineno, offset) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
774 except SyntaxError, err: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
775 raise TemplateSyntaxError(err, filename, lineno, |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
776 offset + (err.offset or 0)) |
1 | 777 elif group: |
778 if patterns: | |
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
|
779 for result in _interpolate(group, patterns[:]): |
1 | 780 yield result |
781 else: | |
69 | 782 yield TEXT, group.replace('$$', '$'), (filename, lineno, |
783 offset) | |
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
|
784 return _interpolate(text, [cls._FULL_EXPR_RE, cls._SHORT_EXPR_RE]) |
1 | 785 _interpolate = classmethod(_interpolate) |
786 | |
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
|
787 def generate(self, 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
|
788 """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
|
789 |
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
|
790 @param ctxt: a `Context` instance containing the data for the template |
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
|
791 @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
|
792 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
|
793 """ |
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
|
794 if ctxt 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
|
795 ctxt = Context() |
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
|
796 if not hasattr(ctxt, '_match_templates'): |
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
797 ctxt._match_templates = [] |
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
798 |
69 | 799 stream = self.stream |
800 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
|
801 stream = filter_(iter(stream), ctxt) |
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
802 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
|
803 |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
804 def _ensure(self, stream, ctxt=None): |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
805 """Ensure that every item on the stream is actually a markup event.""" |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
806 for event in stream: |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
807 try: |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
808 kind, data, pos = event |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
809 except ValueError: |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
810 kind, data, pos = event.totuple() |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
811 yield kind, data, pos |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
812 |
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
|
813 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
|
814 """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
|
815 `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
|
816 """ |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
817 filters = (self._ensure, self._eval, self._match) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
818 |
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
|
819 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
|
820 |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
821 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
|
822 # 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
|
823 # 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
|
824 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
|
825 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
|
826 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
|
827 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
|
828 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
|
829 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
|
830 values = [] |
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
831 for subkind, subdata, subpos in substream: |
69 | 832 if subkind 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
|
833 values.append(subdata.evaluate(ctxt)) |
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
834 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
|
835 values.append(subdata) |
48
06c642ba2b08
convert the result of expressions in attributes to strings so that values like ints are output correctly
mgood
parents:
44
diff
changeset
|
836 value = [unicode(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
|
837 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
|
838 continue |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
839 new_attrib.append((name, u''.join(value))) |
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
|
840 yield kind, (tag, Attributes(new_attrib)), pos |
ad63ad459524
Refactoring to address #6: all match templates are now processed by a single filter, which means that match templates added by included templates are properly applied. A side effect of this refactoring is that `Context` objects may not be reused across multiple template processing runs.
cmlenz
parents:
14
diff
changeset
|
841 |
69 | 842 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
|
843 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
|
844 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
|
845 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
|
846 |
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
|
847 # 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
|
848 # 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
|
849 # 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
|
850 if isinstance(result, basestring): |
69 | 851 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
|
852 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
|
853 # 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
|
854 # 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
|
855 try: |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
856 substream = iter(result) |
81
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
857 for filter_ in filters: |
77
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
858 substream = filter_(substream, ctxt) |
f1aa49c759b2
* Simplify implementation of the individual XPath tests (use closures instead of callable classes)
cmlenz
parents:
75
diff
changeset
|
859 for event in substream: |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
860 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
|
861 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
|
862 # 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
|
863 # through |
69 | 864 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
|
865 |
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
|
866 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
|
867 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
|
868 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
869 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
|
870 """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
|
871 for kind, data, pos in stream: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
872 if kind is SUB: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
873 # 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
|
874 # events to which those directives should be applied |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
875 directives, substream = data |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
876 substream = _apply_directives(substream, ctxt, directives) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
877 for filter_ in (self._eval, self._match, self._flatten): |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
878 substream = filter_(substream, ctxt) |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
879 for event in substream: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
880 yield event |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
881 continue |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
882 else: |
cc034182061e
Template expressions are now compiled to Python bytecode.
cmlenz
parents:
80
diff
changeset
|
883 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
|
884 |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
885 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
|
886 """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
|
887 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
|
888 """ |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
889 if match_templates is None: |
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
890 match_templates = ctxt._match_templates |
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
891 |
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
|
892 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
|
893 |
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
|
894 # 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
|
895 # We might care about namespace events in the future, though |
69 | 896 if 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
|
897 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
|
898 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
|
899 |
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
|
900 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
|
901 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
|
902 result = test(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
|
903 |
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
|
904 if result: |
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
|
905 # 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
|
906 # 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.
cmlenz
parents:
14
diff
changeset
|
907 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
changeset
|
908 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
|
909 while depth > 0: |
73 | 910 kind, data, pos = stream.next() |
911 if kind is START: | |
912 depth += 1 | |
913 elif kind is END: | |
914 depth -= 1 | |
915 content.append((kind, data, pos)) | |
916 test(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
|
917 |
23
00835401c8cc
Separate match and eval filters from the include and user-supplied filters.
cmlenz
parents:
22
diff
changeset
|
918 content = list(self._flatten(content, ctxt)) |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
919 ctxt.push(select=lambda path: Stream(content).select(path)) |
36
57d607f25484
Fix for #7: match templates no longer process their own output.
cmlenz
parents:
35
diff
changeset
|
920 |
78
fa4bafcbe4c7
Minor improvements to how directives are applied in template processing.
cmlenz
parents:
77
diff
changeset
|
921 template = _apply_directives(template, ctxt, directives) |
69 | 922 for event in self._match(self._eval(template, ctxt), |
923 ctxt, match_templates[:idx] + | |
924 match_templates[idx + 1:]): | |
35
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
925 yield event |
3bc4778787c5
Simplify template processing model by removing dynamically generated `SUB` events.
cmlenz
parents:
31
diff
changeset
|
926 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
|
927 |
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 break |
69 | 929 |
930 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
|
931 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
|
932 |
1 | 933 |
69 | 934 EXPR = Template.EXPR |
935 SUB = Template.SUB | |
936 | |
937 | |
1 | 938 class TemplateLoader(object): |
939 """Responsible for loading templates from files on the specified search | |
940 path. | |
941 | |
942 >>> import tempfile | |
943 >>> fd, path = tempfile.mkstemp(suffix='.html', prefix='template') | |
944 >>> os.write(fd, '<p>$var</p>') | |
945 11 | |
946 >>> os.close(fd) | |
947 | |
948 The template loader accepts a list of directory paths that are then used | |
949 when searching for template files, in the given order: | |
950 | |
951 >>> loader = TemplateLoader([os.path.dirname(path)]) | |
952 | |
953 The `load()` method first checks the template cache whether the requested | |
954 template has already been loaded. If not, it attempts to locate the | |
955 template file, and returns the corresponding `Template` object: | |
956 | |
957 >>> template = loader.load(os.path.basename(path)) | |
958 >>> isinstance(template, Template) | |
959 True | |
960 | |
961 Template instances are cached: requesting a template with the same name | |
962 results in the same instance being returned: | |
963 | |
964 >>> loader.load(os.path.basename(path)) is template | |
965 True | |
966 """ | |
967 def __init__(self, search_path=None, auto_reload=False): | |
968 """Create the template laoder. | |
969 | |
970 @param search_path: a list of absolute path names that should be | |
971 searched for template files | |
972 @param auto_reload: whether to check the last modification time of | |
973 template files, and reload them if they have changed | |
974 """ | |
975 self.search_path = search_path | |
976 if self.search_path is None: | |
977 self.search_path = [] | |
978 self.auto_reload = auto_reload | |
979 self._cache = {} | |
980 self._mtime = {} | |
981 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
982 def load(self, filename, relative_to=None): |
1 | 983 """Load the template with the given name. |
984 | |
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
|
985 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
|
986 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
|
987 name is an absolute path, the search path is not bypassed. |
1 | 988 |
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
|
989 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
|
990 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
|
991 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
|
992 |
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
|
993 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
|
994 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
|
995 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
|
996 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
|
997 changed since the last parse.) |
1 | 998 |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
999 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
|
1000 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
|
1001 |
1 | 1002 @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
|
1003 @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
|
1004 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
|
1005 directly |
1 | 1006 """ |
69 | 1007 from markup.filters import IncludeFilter |
1008 | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1009 if relative_to: |
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1010 filename = posixpath.join(posixpath.dirname(relative_to), filename) |
1 | 1011 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
|
1012 |
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
|
1013 # First check the cache to avoid reparsing the same file |
1 | 1014 try: |
1015 tmpl = self._cache[filename] | |
1016 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
|
1017 os.path.getmtime(tmpl.filepath) == self._mtime[filename]: |
1 | 1018 return tmpl |
1019 except KeyError: | |
1020 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
|
1021 |
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
|
1022 # 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
|
1023 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
|
1024 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
|
1025 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
|
1026 |
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
|
1027 for dirname in search_path: |
1 | 1028 filepath = os.path.join(dirname, filename) |
1029 try: | |
1030 fileobj = file(filepath, 'rt') | |
1031 try: | |
21
eca77129518a
* Include paths are now interpreted relative to the path of the including template. Closes #3.
cmlenz
parents:
18
diff
changeset
|
1032 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
|
1033 tmpl.filters.append(IncludeFilter(self)) |
1 | 1034 finally: |
1035 fileobj.close() | |
1036 self._cache[filename] = tmpl | |
1037 self._mtime[filename] = os.path.getmtime(filepath) | |
1038 return tmpl | |
1039 except IOError: | |
1040 continue | |
1041 raise TemplateNotFound(filename, self.search_path) |