annotate genshi/template/markup.py @ 629:cae74e2637c6

Revert second part of [726] (error on includes when no loader specified), which broke I18n extraction via the Babel plugin.
author cmlenz
date Tue, 04 Sep 2007 11:51:58 +0000
parents 6a37018199fd
children e0f12a6f3612
rev   line source
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1 # -*- coding: utf-8 -*-
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2 #
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3 # Copyright (C) 2006-2007 Edgewall Software
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4 # All rights reserved.
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5 #
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6 # This software is licensed as described in the file COPYING, which
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7 # you should have received as part of this distribution. The terms
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8 # are also available at http://genshi.edgewall.org/wiki/License.
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9 #
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10 # This software consists of voluntary contributions made by many
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11 # individuals. For the exact contribution history, see the revision
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12 # history and logs, available at http://genshi.edgewall.org/log/.
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13
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14 """Markup templating engine."""
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15
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16 from itertools import chain
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17
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18 from genshi.core import Attrs, Namespace, Stream, StreamEventKind
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19 from genshi.core import START, END, START_NS, END_NS, TEXT, PI, COMMENT
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20 from genshi.input import XMLParser
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8dd0d34a9fb7 Renamed `genshi.template.core` to `genshi.template.base`, mainly to avoid confusion with `genshi.core`.
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21 from genshi.template.base import BadDirectiveError, Template, \
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bb939ed3058c Added include directive for text templates (#115). Thanks to Alastair for the original patch.
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22 TemplateSyntaxError, _apply_directives, \
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23 EXEC, INCLUDE, SUB
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24 from genshi.template.eval import Suite
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ea71a51e0258 Move string interpolation code into separate module (`genshi.template.interpolation`).
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25 from genshi.template.interpolation import interpolate
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26 from genshi.template.directives import *
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6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
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27 from genshi.template.text import NewTextTemplate
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28
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29 __all__ = ['MarkupTemplate']
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30 __docformat__ = 'restructuredtext en'
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31
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32
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33 class MarkupTemplate(Template):
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34 """Implementation of the template language for XML-based templates.
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35
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36 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/">
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37 ... <li py:for="item in items">${item}</li>
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38 ... </ul>''')
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39 >>> print tmpl.generate(items=[1, 2, 3])
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40 <ul>
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41 <li>1</li><li>2</li><li>3</li>
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42 </ul>
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43 """
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68a8308309b9 More API documentation.
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44
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45 DIRECTIVE_NAMESPACE = Namespace('http://genshi.edgewall.org/')
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46 XINCLUDE_NAMESPACE = Namespace('http://www.w3.org/2001/XInclude')
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47
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48 directives = [('def', DefDirective),
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49 ('match', MatchDirective),
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50 ('when', WhenDirective),
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51 ('otherwise', OtherwiseDirective),
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52 ('for', ForDirective),
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53 ('if', IfDirective),
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54 ('choose', ChooseDirective),
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55 ('with', WithDirective),
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56 ('replace', ReplaceDirective),
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57 ('content', ContentDirective),
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58 ('attrs', AttrsDirective),
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59 ('strip', StripDirective)]
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bc5faca93699 Text templates now default to rendering as plain text; it is no longer necessary to explicitly specify the "text" method to the `render()` or `serialize()` method of the generated markup stream. See tickets #62 and #118.
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60 serializer = 'xml'
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61
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62 def __init__(self, source, basedir=None, filename=None, loader=None,
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9ada030ad986 Changed the default error handling mode to "strict".
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63 encoding=None, lookup='strict', allow_exec=True):
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64 Template.__init__(self, source, basedir=basedir, filename=filename,
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6e21c89d9255 Support for Python code blocks in templates can now be disabled. Closes #123.
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65 loader=loader, encoding=encoding, lookup=lookup,
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66 allow_exec=allow_exec)
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782931585925 Fix bug introduced in [575]: includes weren't being processed inside match templates.
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67 # Make sure the include filter comes after the match filter
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68 if loader:
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69 self.filters.remove(self._include)
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70 self.filters += [self._match]
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71 if loader:
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72 self.filters.append(self._include)
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73
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74 def _parse(self, source, encoding):
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75 streams = [[]] # stacked lists of events of the "compiled" template
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76 dirmap = {} # temporary mapping of directives to elements
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77 ns_prefix = {}
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78 depth = 0
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880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
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79 fallbacks = []
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80 includes = []
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81
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82 if not isinstance(source, Stream):
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e065d7906b68 * Better method to propogate the full path to the template file on parse errors. Supersedes r513.
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83 source = XMLParser(source, filename=self.filename,
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84 encoding=encoding)
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85
ca46dc9c7761 `MarkupTemplate`s can now be instantiated from markup streams, in addition to strings and file-like objects. Thanks to David Fraser for the patch. Closes #69.
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86 for kind, data, pos in source:
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87 stream = streams[-1]
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88
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89 if kind is START_NS:
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90 # Strip out the namespace declaration for template directives
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91 prefix, uri = data
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92 ns_prefix[prefix] = uri
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93 if uri not in (self.DIRECTIVE_NAMESPACE,
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94 self.XINCLUDE_NAMESPACE):
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95 stream.append((kind, data, pos))
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96
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97 elif kind is END_NS:
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98 uri = ns_prefix.pop(data, None)
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99 if uri and uri not in (self.DIRECTIVE_NAMESPACE,
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100 self.XINCLUDE_NAMESPACE):
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101 stream.append((kind, data, pos))
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102
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103 elif kind is START:
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104 # Record any directive attributes in start tags
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105 tag, attrs = data
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106 directives = []
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107 strip = False
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108
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109 if tag in self.DIRECTIVE_NAMESPACE:
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110 cls = self._dir_by_name.get(tag.localname)
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111 if cls is None:
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112 raise BadDirectiveError(tag.localname, self.filepath,
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113 pos[1])
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5458a4e8814c For directives used as elements, pass all attributes without a namespace to the directive class. This enables adding optional extra attributes to directives.
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114 args = dict([(name.localname, value) for name, value
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115 in attrs if not name.namespace])
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116 directives.append((cls, args, ns_prefix.copy(), pos))
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117 strip = True
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118
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119 new_attrs = []
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120 for name, value in attrs:
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121 if name in self.DIRECTIVE_NAMESPACE:
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122 cls = self._dir_by_name.get(name.localname)
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123 if cls is None:
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124 raise BadDirectiveError(name.localname,
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125 self.filepath, pos[1])
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0910d5978f45 Follow-up to [431]: directives are no longer instantiated directly at parse time, but instead by the `attach()` method of the directive class (which replaces the `prepare()` method).
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126 directives.append((cls, value, ns_prefix.copy(), pos))
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127 else:
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128 if value:
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129 value = list(interpolate(value, self.basedir,
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130 pos[0], pos[1], pos[2],
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131 lookup=self.lookup))
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
132 if len(value) == 1 and value[0][0] is TEXT:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
133 value = value[0][1]
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
134 else:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
135 value = [(TEXT, u'', pos)]
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
136 new_attrs.append((name, value))
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
137 new_attrs = Attrs(new_attrs)
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
138
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
139 if directives:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
140 index = self._dir_order.index
362
0910d5978f45 Follow-up to [431]: directives are no longer instantiated directly at parse time, but instead by the `attach()` method of the directive class (which replaces the `prepare()` method).
cmlenz
parents: 336
diff changeset
141 directives.sort(lambda a, b: cmp(index(a[0]), index(b[0])))
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
142 dirmap[(depth, tag)] = (directives, len(stream), strip)
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
143
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
144 if tag in self.XINCLUDE_NAMESPACE:
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
145 if tag.localname == 'include':
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
146 include_href = new_attrs.get('href')
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
147 if not include_href:
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
148 raise TemplateSyntaxError('Include misses required '
422
95089b6e37ca More work to include absolute file paths in exceptions.
cmlenz
parents: 421
diff changeset
149 'attribute "href"',
95089b6e37ca More work to include absolute file paths in exceptions.
cmlenz
parents: 421
diff changeset
150 self.filepath, *pos[1:])
610
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
151 includes.append((include_href, new_attrs.get('parse')))
381
a6c2a9cd2e92 Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.
cmlenz
parents: 374
diff changeset
152 streams.append([])
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
153 elif tag.localname == 'fallback':
590
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
154 streams.append([])
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
155 fallbacks.append(streams[-1])
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
156
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
157 else:
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
158 stream.append((kind, (tag, new_attrs), pos))
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
159
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
160 depth += 1
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
161
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
162 elif kind is END:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
163 depth -= 1
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
164
590
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
165 if fallbacks and data == self.XINCLUDE_NAMESPACE['fallback']:
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
166 assert streams.pop() is fallbacks[-1]
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
167 elif data == self.XINCLUDE_NAMESPACE['include']:
590
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
168 fallback = None
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
169 if len(fallbacks) == len(includes):
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
170 fallback = fallbacks.pop()
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
171 streams.pop() # discard anything between the include tags
880b1a75d046 Fix includes so that they again raise an exception when the included template is not found and no fallback has been provided.
cmlenz
parents: 552
diff changeset
172 # and the fallback element
381
a6c2a9cd2e92 Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.
cmlenz
parents: 374
diff changeset
173 stream = streams[-1]
610
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
174 href, parse = includes.pop()
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
175 try:
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
176 cls = {
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
177 'xml': MarkupTemplate,
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
178 'text': NewTextTemplate
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
179 }[parse or 'xml']
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
180 except KeyError:
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
181 raise TemplateSyntaxError('Invalid value for "parse" '
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
182 'attribute of include',
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
183 self.filepath, *pos[1:])
6a37018199fd * XInclude elements in markup templates now support the `parse` attribute; when set to "xml" (the default), the include is processed as before, but when set to "text", the included template is parsed as a text template using the new syntax (ticket #101).
cmlenz
parents: 609
diff changeset
184 stream.append((INCLUDE, (href, cls, fallback), pos))
363
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
185 else:
caf7b68ab5dc Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
186 stream.append((kind, data, pos))
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
187
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
188 # If there have have directive attributes with the corresponding
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
189 # start tag, move the events inbetween into a "subprogram"
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
190 if (depth, data) in dirmap:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
191 directives, start_offset, strip = dirmap.pop((depth, data))
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
192 substream = stream[start_offset:]
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
193 if strip:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
194 substream = substream[1:-1]
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
195 stream[start_offset:] = [(SUB, (directives, substream),
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
196 pos)]
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
197
405
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
198 elif kind is PI and data[0] == 'python':
545
6e21c89d9255 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
199 if not self.allow_exec:
6e21c89d9255 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
200 raise TemplateSyntaxError('Python code blocks not allowed',
6e21c89d9255 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
201 self.filepath, *pos[1:])
405
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
202 try:
601
9ae986bcba9a Simplify implementation of `py:with` directive by compiling to a `Suite`, instead of manually breaking up the statement and compiling each part to an `Expression`. Also, the first line of code in a `Suite` is now stored as the "function name" of the bytecode, so that it shows up in tracebacks.
cmlenz
parents: 590
diff changeset
203 suite = Suite(data[1], self.filepath, pos[1],
442
ff7c72b52fb2 Back out [510] and instead implement configurable error handling modes. The default is the old 0.3.x behaviour, but more strict error handling is available as an option.
cmlenz
parents: 434
diff changeset
204 lookup=self.lookup)
405
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
205 except SyntaxError, err:
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
206 raise TemplateSyntaxError(err, self.filepath,
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
207 pos[1] + (err.lineno or 1) - 1,
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
208 pos[2] + (err.offset or 0))
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
209 stream.append((EXEC, suite, pos))
bd5da099c113 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
210
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
211 elif kind is TEXT:
442
ff7c72b52fb2 Back out [510] and instead implement configurable error handling modes. The default is the old 0.3.x behaviour, but more strict error handling is available as an option.
cmlenz
parents: 434
diff changeset
212 for kind, data, pos in interpolate(data, self.basedir, pos[0],
ff7c72b52fb2 Back out [510] and instead implement configurable error handling modes. The default is the old 0.3.x behaviour, but more strict error handling is available as an option.
cmlenz
parents: 434
diff changeset
213 pos[1], pos[2],
ff7c72b52fb2 Back out [510] and instead implement configurable error handling modes. The default is the old 0.3.x behaviour, but more strict error handling is available as an option.
cmlenz
parents: 434
diff changeset
214 lookup=self.lookup):
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
215 stream.append((kind, data, pos))
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
216
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
217 elif kind is COMMENT:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
218 if not data.lstrip().startswith('!'):
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
219 stream.append((kind, data, pos))
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
220
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
221 else:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
222 stream.append((kind, data, pos))
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
223
381
a6c2a9cd2e92 Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.
cmlenz
parents: 374
diff changeset
224 assert len(streams) == 1
a6c2a9cd2e92 Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.
cmlenz
parents: 374
diff changeset
225 return streams[0]
a6c2a9cd2e92 Fix for #80: fallback only shown when the template to include wasn't found. In addition, the nesting of includes and fallback content should work correctly, and directives/expressions/etc inside fallback content are processed. Thanks to Christian Boos for the original patch and unit tests.
cmlenz
parents: 374
diff changeset
226
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
227 def _match(self, stream, ctxt, match_templates=None):
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
228 """Internal stream filter that applies any defined match templates
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
229 to the stream.
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
230 """
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
231 if match_templates is None:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
232 match_templates = ctxt._match_templates
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
233
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
234 tail = []
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
235 def _strip(stream):
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
236 depth = 1
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
237 while 1:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
238 event = stream.next()
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
239 if event[0] is START:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
240 depth += 1
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
241 elif event[0] is END:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
242 depth -= 1
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
243 if depth > 0:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
244 yield event
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
245 else:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
246 tail[:] = [event]
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
247 break
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
248
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
249 for event in stream:
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
250
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
251 # We (currently) only care about start and end events for matching
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
252 # We might care about namespace events in the future, though
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
253 if not match_templates or (event[0] is not START and
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
254 event[0] is not END):
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
255 yield event
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
256 continue
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
257
602
509b3a5e765e Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
258 for idx, (test, path, template, hints, namespaces, directives) \
509b3a5e765e Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
259 in enumerate(match_templates):
336
5f2c7782cd8a Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
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260
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261 if test(event, namespaces, ctxt) is True:
602
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262 if 'match_once' in hints:
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263 del match_templates[idx]
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264 idx -= 1
336
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265
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266 # Let the remaining match templates know about the event so
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267 # they get a chance to update their internal state
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268 for test in [mt[0] for mt in match_templates[idx + 1:]]:
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269 test(event, namespaces, ctxt, updateonly=True)
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270
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271 # Consume and store all events until an end event
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272 # corresponding to this start event is encountered
602
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273 inner = _strip(stream)
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274 if 'match_once' not in hints \
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275 and 'not_recursive' not in hints:
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276 inner = self._match(inner, ctxt, [match_templates[idx]])
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277 content = list(self._include(chain([event], inner, tail),
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278 ctxt))
336
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279
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280 for test in [mt[0] for mt in match_templates]:
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281 test(tail[0], namespaces, ctxt, updateonly=True)
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282
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283 # Make the select() function available in the body of the
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284 # match template
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285 def select(path):
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286 return Stream(content).select(path, namespaces, ctxt)
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287 ctxt.push(dict(select=select))
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288
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289 # Recursively process the output
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290 template = _apply_directives(template, ctxt, directives)
602
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291 remaining = match_templates
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292 if 'match_once' not in hints:
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293 remaining = remaining[:idx] + remaining[idx + 1:]
336
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294 for event in self._match(self._eval(self._flatten(template,
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295 ctxt),
602
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296 ctxt), ctxt, remaining):
336
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297 yield event
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298
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299 ctxt.pop()
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300 break
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301
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302 else: # no matches
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303 yield event
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