1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
|
# -*- coding: utf-8 -*-
#
# Copyright (C) 2006-2009 Edgewall Software
# All rights reserved.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://genshi.edgewall.org/wiki/License.
#
# This software consists of voluntary contributions made by many
# individuals. For the exact contribution history, see the revision
# history and logs, available at http://genshi.edgewall.org/log/.
"""Implementation of the various template directives."""
from genshi.core import QName, Stream
from genshi.path import Path
from genshi.template.base import TemplateRuntimeError, TemplateSyntaxError, \
EXPR, _apply_directives, _eval_expr
from genshi.template.eval import Expression, ExpressionASTTransformer, \
_ast, _parse
__all__ = ['AttrsDirective', 'ChooseDirective', 'ContentDirective',
'DefDirective', 'ForDirective', 'IfDirective', 'MatchDirective',
'OtherwiseDirective', 'ReplaceDirective', 'StripDirective',
'WhenDirective', 'WithDirective']
__docformat__ = 'restructuredtext en'
class DirectiveMeta(type):
"""Meta class for template directives."""
def __new__(cls, name, bases, d):
d['tagname'] = name.lower().replace('directive', '')
return type.__new__(cls, name, bases, d)
class Directive(object):
"""Abstract base class for template directives.
A directive is basically a callable that takes three positional arguments:
``ctxt`` is the template data context, ``stream`` is an iterable over the
events that the directive applies to, and ``directives`` is is a list of
other directives on the same stream that need to be applied.
Directives can be "anonymous" or "registered". Registered directives can be
applied by the template author using an XML attribute with the
corresponding name in the template. Such directives should be subclasses of
this base class that can be instantiated with the value of the directive
attribute as parameter.
Anonymous directives are simply functions conforming to the protocol
described above, and can only be applied programmatically (for example by
template filters).
"""
__metaclass__ = DirectiveMeta
__slots__ = ['expr']
def __init__(self, value, template=None, namespaces=None, lineno=-1,
offset=-1):
self.expr = self._parse_expr(value, template, lineno, offset)
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
"""Called after the template stream has been completely parsed.
:param template: the `Template` object
:param stream: the event stream associated with the directive
:param value: the argument value for the directive; if the directive was
specified as an element, this will be an `Attrs` instance
with all specified attributes, otherwise it will be a
`unicode` object with just the attribute value
:param namespaces: a mapping of namespace URIs to prefixes
:param pos: a ``(filename, lineno, offset)`` tuple describing the
location where the directive was found in the source
This class method should return a ``(directive, stream)`` tuple. If
``directive`` is not ``None``, it should be an instance of the `Directive`
class, and gets added to the list of directives applied to the substream
at runtime. `stream` is an event stream that replaces the original
stream associated with the directive.
"""
return cls(value, template, namespaces, *pos[1:]), stream
def __call__(self, stream, directives, ctxt, **vars):
"""Apply the directive to the given stream.
:param stream: the event stream
:param directives: a list of the remaining directives that should
process the stream
:param ctxt: the context data
:param vars: additional variables that should be made available when
Python code is executed
"""
raise NotImplementedError
def __repr__(self):
expr = ''
if getattr(self, 'expr', None) is not None:
expr = ' "%s"' % self.expr.source
return '<%s%s>' % (type(self).__name__, expr)
@classmethod
def _parse_expr(cls, expr, template, lineno=-1, offset=-1):
"""Parses the given expression, raising a useful error message when a
syntax error is encountered.
"""
try:
return expr and Expression(expr, template.filepath, lineno,
lookup=template.lookup) or None
except SyntaxError, err:
err.msg += ' in expression "%s" of "%s" directive' % (expr,
cls.tagname)
raise TemplateSyntaxError(err, template.filepath, lineno,
offset + (err.offset or 0))
def _assignment(ast):
"""Takes the AST representation of an assignment, and returns a
function that applies the assignment of a given value to a dictionary.
"""
def _names(node):
if isinstance(node, _ast.Tuple):
return tuple([_names(child) for child in node.elts])
elif isinstance(node, _ast.Name):
return node.id
def _assign(data, value, names=_names(ast)):
if type(names) is tuple:
for idx in range(len(names)):
_assign(data, value[idx], names[idx])
else:
data[names] = value
return _assign
class AttrsDirective(Directive):
"""Implementation of the ``py:attrs`` template directive.
The value of the ``py:attrs`` attribute should be a dictionary or a sequence
of ``(name, value)`` tuples. The items in that dictionary or sequence are
added as attributes to the element:
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/">
... <li py:attrs="foo">Bar</li>
... </ul>''')
>>> print(tmpl.generate(foo={'class': 'collapse'}))
<ul>
<li class="collapse">Bar</li>
</ul>
>>> print(tmpl.generate(foo=[('class', 'collapse')]))
<ul>
<li class="collapse">Bar</li>
</ul>
If the value evaluates to ``None`` (or any other non-truth value), no
attributes are added:
>>> print(tmpl.generate(foo=None))
<ul>
<li>Bar</li>
</ul>
"""
__slots__ = []
def __call__(self, stream, directives, ctxt, **vars):
def _generate():
kind, (tag, attrib), pos = stream.next()
attrs = _eval_expr(self.expr, ctxt, vars)
if attrs:
if isinstance(attrs, Stream):
try:
attrs = iter(attrs).next()
except StopIteration:
attrs = []
elif not isinstance(attrs, list): # assume it's a dict
attrs = attrs.items()
attrib -= [name for name, val in attrs if val is None]
attrib |= [(QName(name), unicode(val).strip()) for name, val
in attrs if val is not None]
yield kind, (tag, attrib), pos
for event in stream:
yield event
return _apply_directives(_generate(), directives, ctxt, vars)
class ContentDirective(Directive):
"""Implementation of the ``py:content`` template directive.
This directive replaces the content of the element with the result of
evaluating the value of the ``py:content`` attribute:
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/">
... <li py:content="bar">Hello</li>
... </ul>''')
>>> print(tmpl.generate(bar='Bye'))
<ul>
<li>Bye</li>
</ul>
"""
__slots__ = []
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
raise TemplateSyntaxError('The content directive can not be used '
'as an element', template.filepath,
*pos[1:])
expr = cls._parse_expr(value, template, *pos[1:])
return None, [stream[0], (EXPR, expr, pos), stream[-1]]
class DefDirective(Directive):
"""Implementation of the ``py:def`` template directive.
This directive can be used to create "Named Template Functions", which
are template snippets that are not actually output during normal
processing, but rather can be expanded from expressions in other places
in the template.
A named template function can be used just like a normal Python function
from template expressions:
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <p py:def="echo(greeting, name='world')" class="message">
... ${greeting}, ${name}!
... </p>
... ${echo('Hi', name='you')}
... </div>''')
>>> print(tmpl.generate(bar='Bye'))
<div>
<p class="message">
Hi, you!
</p>
</div>
If a function does not require parameters, the parenthesis can be omitted
in the definition:
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <p py:def="helloworld" class="message">
... Hello, world!
... </p>
... ${helloworld()}
... </div>''')
>>> print(tmpl.generate(bar='Bye'))
<div>
<p class="message">
Hello, world!
</p>
</div>
"""
__slots__ = ['name', 'args', 'star_args', 'dstar_args', 'defaults']
def __init__(self, args, template, namespaces=None, lineno=-1, offset=-1):
Directive.__init__(self, None, template, namespaces, lineno, offset)
ast = _parse(args).body
self.args = []
self.star_args = None
self.dstar_args = None
self.defaults = {}
if isinstance(ast, _ast.Call):
self.name = ast.func.id
for arg in ast.args:
# only names
self.args.append(arg.id)
for kwd in ast.keywords:
self.args.append(kwd.arg)
exp = Expression(kwd.value, template.filepath,
lineno, lookup=template.lookup)
self.defaults[kwd.arg] = exp
if getattr(ast, 'starargs', None):
self.star_args = ast.starargs.id
if getattr(ast, 'kwargs', None):
self.dstar_args = ast.kwargs.id
else:
self.name = ast.id
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('function')
return super(DefDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
stream = list(stream)
def function(*args, **kwargs):
scope = {}
args = list(args) # make mutable
for name in self.args:
if args:
scope[name] = args.pop(0)
else:
if name in kwargs:
val = kwargs.pop(name)
else:
val = _eval_expr(self.defaults.get(name), ctxt, vars)
scope[name] = val
if not self.star_args is None:
scope[self.star_args] = args
if not self.dstar_args is None:
scope[self.dstar_args] = kwargs
ctxt.push(scope)
for event in _apply_directives(stream, directives, ctxt, vars):
yield event
ctxt.pop()
function.__name__ = self.name
# Store the function reference in the bottom context frame so that it
# doesn't get popped off before processing the template has finished
# FIXME: this makes context data mutable as a side-effect
ctxt.frames[-1][self.name] = function
return []
def __repr__(self):
return '<%s "%s">' % (type(self).__name__, self.name)
class ForDirective(Directive):
"""Implementation of the ``py:for`` template directive for repeating an
element based on an iterable in the context data.
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/">
... <li py:for="item in items">${item}</li>
... </ul>''')
>>> print(tmpl.generate(items=[1, 2, 3]))
<ul>
<li>1</li><li>2</li><li>3</li>
</ul>
"""
__slots__ = ['assign', 'filename']
def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1):
if ' in ' not in value:
raise TemplateSyntaxError('"in" keyword missing in "for" directive',
template.filepath, lineno, offset)
assign, value = value.split(' in ', 1)
ast = _parse(assign, 'exec')
value = 'iter(%s)' % value.strip()
self.assign = _assignment(ast.body[0].value)
self.filename = template.filepath
Directive.__init__(self, value, template, namespaces, lineno, offset)
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('each')
return super(ForDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
iterable = _eval_expr(self.expr, ctxt, vars)
if iterable is None:
return
assign = self.assign
scope = {}
stream = list(stream)
for item in iterable:
assign(scope, item)
ctxt.push(scope)
for event in _apply_directives(stream, directives, ctxt, vars):
yield event
ctxt.pop()
def __repr__(self):
return '<%s>' % type(self).__name__
class IfDirective(Directive):
"""Implementation of the ``py:if`` template directive for conditionally
excluding elements from being output.
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <b py:if="foo">${bar}</b>
... </div>''')
>>> print(tmpl.generate(foo=True, bar='Hello'))
<div>
<b>Hello</b>
</div>
"""
__slots__ = []
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('test')
return super(IfDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
value = _eval_expr(self.expr, ctxt, vars)
if value:
return _apply_directives(stream, directives, ctxt, vars)
return []
class MatchDirective(Directive):
"""Implementation of the ``py:match`` template directive.
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <span py:match="greeting">
... Hello ${select('@name')}
... </span>
... <greeting name="Dude" />
... </div>''')
>>> print(tmpl.generate())
<div>
<span>
Hello Dude
</span>
</div>
"""
__slots__ = ['path', 'namespaces', 'hints']
def __init__(self, value, template, hints=None, namespaces=None,
lineno=-1, offset=-1):
Directive.__init__(self, None, template, namespaces, lineno, offset)
self.path = Path(value, template.filepath, lineno)
self.namespaces = namespaces or {}
self.hints = hints or ()
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
hints = []
if type(value) is dict:
if value.get('buffer', '').lower() == 'false':
hints.append('not_buffered')
if value.get('once', '').lower() == 'true':
hints.append('match_once')
if value.get('recursive', '').lower() == 'false':
hints.append('not_recursive')
value = value.get('path')
return cls(value, template, frozenset(hints), namespaces, *pos[1:]), \
stream
def __call__(self, stream, directives, ctxt, **vars):
ctxt._match_templates.append((self.path.test(ignore_context=True),
self.path, list(stream), self.hints,
self.namespaces, directives))
return []
def __repr__(self):
return '<%s "%s">' % (type(self).__name__, self.path.source)
class ReplaceDirective(Directive):
"""Implementation of the ``py:replace`` template directive.
This directive replaces the element with the result of evaluating the
value of the ``py:replace`` attribute:
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <span py:replace="bar">Hello</span>
... </div>''')
>>> print(tmpl.generate(bar='Bye'))
<div>
Bye
</div>
This directive is equivalent to ``py:content`` combined with ``py:strip``,
providing a less verbose way to achieve the same effect:
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <span py:content="bar" py:strip="">Hello</span>
... </div>''')
>>> print(tmpl.generate(bar='Bye'))
<div>
Bye
</div>
"""
__slots__ = []
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('value')
if not value:
raise TemplateSyntaxError('missing value for "replace" directive',
template.filepath, *pos[1:])
expr = cls._parse_expr(value, template, *pos[1:])
return None, [(EXPR, expr, pos)]
class StripDirective(Directive):
"""Implementation of the ``py:strip`` template directive.
When the value of the ``py:strip`` attribute evaluates to ``True``, the
element is stripped from the output
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <div py:strip="True"><b>foo</b></div>
... </div>''')
>>> print(tmpl.generate())
<div>
<b>foo</b>
</div>
Leaving the attribute value empty is equivalent to a truth value.
This directive is particulary interesting for named template functions or
match templates that do not generate a top-level element:
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <div py:def="echo(what)" py:strip="">
... <b>${what}</b>
... </div>
... ${echo('foo')}
... </div>''')
>>> print(tmpl.generate())
<div>
<b>foo</b>
</div>
"""
__slots__ = []
def __call__(self, stream, directives, ctxt, **vars):
def _generate():
if not self.expr or _eval_expr(self.expr, ctxt, vars):
stream.next() # skip start tag
previous = stream.next()
for event in stream:
yield previous
previous = event
else:
for event in stream:
yield event
return _apply_directives(_generate(), directives, ctxt, vars)
class ChooseDirective(Directive):
"""Implementation of the ``py:choose`` directive for conditionally selecting
one of several body elements to display.
If the ``py:choose`` expression is empty the expressions of nested
``py:when`` directives are tested for truth. The first true ``py:when``
body is output. If no ``py:when`` directive is matched then the fallback
directive ``py:otherwise`` will be used.
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"
... py:choose="">
... <span py:when="0 == 1">0</span>
... <span py:when="1 == 1">1</span>
... <span py:otherwise="">2</span>
... </div>''')
>>> print(tmpl.generate())
<div>
<span>1</span>
</div>
If the ``py:choose`` directive contains an expression, the nested
``py:when`` directives are tested for equality to the ``py:choose``
expression:
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"
... py:choose="2">
... <span py:when="1">1</span>
... <span py:when="2">2</span>
... </div>''')
>>> print(tmpl.generate())
<div>
<span>2</span>
</div>
Behavior is undefined if a ``py:choose`` block contains content outside a
``py:when`` or ``py:otherwise`` block. Behavior is also undefined if a
``py:otherwise`` occurs before ``py:when`` blocks.
"""
__slots__ = ['matched', 'value']
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('test')
return super(ChooseDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
info = [False, bool(self.expr), None]
if self.expr:
info[2] = _eval_expr(self.expr, ctxt, vars)
ctxt._choice_stack.append(info)
for event in _apply_directives(stream, directives, ctxt, vars):
yield event
ctxt._choice_stack.pop()
class WhenDirective(Directive):
"""Implementation of the ``py:when`` directive for nesting in a parent with
the ``py:choose`` directive.
See the documentation of the `ChooseDirective` for usage.
"""
__slots__ = ['filename']
def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1):
Directive.__init__(self, value, template, namespaces, lineno, offset)
self.filename = template.filepath
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('test')
return super(WhenDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
info = ctxt._choice_stack and ctxt._choice_stack[-1]
if not info:
raise TemplateRuntimeError('"when" directives can only be used '
'inside a "choose" directive',
self.filename, *stream.next()[2][1:])
if info[0]:
return []
if not self.expr and not info[1]:
raise TemplateRuntimeError('either "choose" or "when" directive '
'must have a test expression',
self.filename, *stream.next()[2][1:])
if info[1]:
value = info[2]
if self.expr:
matched = value == _eval_expr(self.expr, ctxt, vars)
else:
matched = bool(value)
else:
matched = bool(_eval_expr(self.expr, ctxt, vars))
info[0] = matched
if not matched:
return []
return _apply_directives(stream, directives, ctxt, vars)
class OtherwiseDirective(Directive):
"""Implementation of the ``py:otherwise`` directive for nesting in a parent
with the ``py:choose`` directive.
See the documentation of `ChooseDirective` for usage.
"""
__slots__ = ['filename']
def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1):
Directive.__init__(self, None, template, namespaces, lineno, offset)
self.filename = template.filepath
def __call__(self, stream, directives, ctxt, **vars):
info = ctxt._choice_stack and ctxt._choice_stack[-1]
if not info:
raise TemplateRuntimeError('an "otherwise" directive can only be '
'used inside a "choose" directive',
self.filename, *stream.next()[2][1:])
if info[0]:
return []
info[0] = True
return _apply_directives(stream, directives, ctxt, vars)
class WithDirective(Directive):
"""Implementation of the ``py:with`` template directive, which allows
shorthand access to variables and expressions.
>>> from genshi.template import MarkupTemplate
>>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/">
... <span py:with="y=7; z=x+10">$x $y $z</span>
... </div>''')
>>> print(tmpl.generate(x=42))
<div>
<span>42 7 52</span>
</div>
"""
__slots__ = ['vars']
def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1):
Directive.__init__(self, None, template, namespaces, lineno, offset)
self.vars = []
value = value.strip()
try:
ast = _parse(value, 'exec')
for node in ast.body:
if not isinstance(node, _ast.Assign):
raise TemplateSyntaxError('only assignment allowed in '
'value of the "with" directive',
template.filepath, lineno, offset)
self.vars.append(([_assignment(n) for n in node.targets],
Expression(node.value, template.filepath,
lineno, lookup=template.lookup)))
except SyntaxError, err:
err.msg += ' in expression "%s" of "%s" directive' % (value,
self.tagname)
raise TemplateSyntaxError(err, template.filepath, lineno,
offset + (err.offset or 0))
@classmethod
def attach(cls, template, stream, value, namespaces, pos):
if type(value) is dict:
value = value.get('vars')
return super(WithDirective, cls).attach(template, stream, value,
namespaces, pos)
def __call__(self, stream, directives, ctxt, **vars):
frame = {}
ctxt.push(frame)
for targets, expr in self.vars:
value = _eval_expr(expr, ctxt, vars)
for assign in targets:
assign(frame, value)
for event in _apply_directives(stream, directives, ctxt, vars):
yield event
ctxt.pop()
def __repr__(self):
return '<%s>' % (type(self).__name__)
|