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annotate genshi/template/markup.py @ 606:37ff75bb4301 trunk

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Changed the default error handling mode to "strict".
author cmlenz
date Mon, 27 Aug 2007 20:05:31 +0000
parents d0345c64da65
children 6d4877844e28
rev   line source
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7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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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 import sys
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18
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19 from genshi.core import Attrs, Namespace, Stream, StreamEventKind
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20 from genshi.core import START, END, START_NS, END_NS, TEXT, PI, COMMENT
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21 from genshi.input import XMLParser
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e29a94b3ba0c Renamed `genshi.template.core` to `genshi.template.base`, mainly to avoid confusion with `genshi.core`.
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22 from genshi.template.base import BadDirectiveError, Template, \
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b373f80f7763 Added include directive for text templates (#115). Thanks to Alastair for the original patch.
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23 TemplateSyntaxError, _apply_directives, \
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24 INCLUDE, SUB
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25 from genshi.template.eval import Suite
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26 from genshi.template.interpolation import interpolate
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27 from genshi.template.directives import *
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28
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29 if sys.version_info < (2, 4):
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30 _ctxt2dict = lambda ctxt: ctxt.frames[0]
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31 else:
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32 _ctxt2dict = lambda ctxt: ctxt
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33
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34 __all__ = ['MarkupTemplate']
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35 __docformat__ = 'restructuredtext en'
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36
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37
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38 class MarkupTemplate(Template):
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39 """Implementation of the template language for XML-based templates.
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40
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41 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/">
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42 ... <li py:for="item in items">${item}</li>
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43 ... </ul>''')
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44 >>> print tmpl.generate(items=[1, 2, 3])
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45 <ul>
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46 <li>1</li><li>2</li><li>3</li>
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47 </ul>
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48 """
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49 EXEC = StreamEventKind('EXEC')
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50 """Stream event kind representing a Python code suite to execute."""
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51
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52 DIRECTIVE_NAMESPACE = Namespace('http://genshi.edgewall.org/')
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53 XINCLUDE_NAMESPACE = Namespace('http://www.w3.org/2001/XInclude')
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54
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55 directives = [('def', DefDirective),
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56 ('match', MatchDirective),
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57 ('when', WhenDirective),
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58 ('otherwise', OtherwiseDirective),
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59 ('for', ForDirective),
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60 ('if', IfDirective),
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61 ('choose', ChooseDirective),
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62 ('with', WithDirective),
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63 ('replace', ReplaceDirective),
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64 ('content', ContentDirective),
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65 ('attrs', AttrsDirective),
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66 ('strip', StripDirective)]
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d0345c64da65 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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67 serializer = 'xml'
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68
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69 def __init__(self, source, basedir=None, filename=None, loader=None,
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37ff75bb4301 Changed the default error handling mode to "strict".
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70 encoding=None, lookup='strict', allow_exec=True):
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71 Template.__init__(self, source, basedir=basedir, filename=filename,
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619340e2d805 Support for Python code blocks in templates can now be disabled. Closes #123.
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72 loader=loader, encoding=encoding, lookup=lookup,
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73 allow_exec=allow_exec)
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f56046e4b0de Fix bug introduced in [575]: includes weren't being processed inside match templates.
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74 # Make sure the include filter comes after the match filter
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75 if loader:
f56046e4b0de Fix bug introduced in [575]: includes weren't being processed inside match templates.
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76 self.filters.remove(self._include)
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77 self.filters += [self._exec, self._match]
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f56046e4b0de Fix bug introduced in [575]: includes weren't being processed inside match templates.
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78 if loader:
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79 self.filters.append(self._include)
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80
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81 def _parse(self, source, encoding):
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82 streams = [[]] # stacked lists of events of the "compiled" template
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83 dirmap = {} # temporary mapping of directives to elements
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84 ns_prefix = {}
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85 depth = 0
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36b5a03534a0 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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86 fallbacks = []
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87 includes = []
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88
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b146277eb54a `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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89 if not isinstance(source, Stream):
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5692bc32ba5f * Better method to propogate the full path to the template file on parse errors. Supersedes r513.
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90 source = XMLParser(source, filename=self.filename,
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91 encoding=encoding)
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92
b146277eb54a `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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93 for kind, data, pos in source:
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94 stream = streams[-1]
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95
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96 if kind is START_NS:
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97 # Strip out the namespace declaration for template directives
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98 prefix, uri = data
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99 ns_prefix[prefix] = uri
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100 if uri not in (self.DIRECTIVE_NAMESPACE,
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101 self.XINCLUDE_NAMESPACE):
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102 stream.append((kind, data, pos))
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103
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104 elif kind is END_NS:
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105 uri = ns_prefix.pop(data, None)
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106 if uri and uri not in (self.DIRECTIVE_NAMESPACE,
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107 self.XINCLUDE_NAMESPACE):
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108 stream.append((kind, data, pos))
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109
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110 elif kind is START:
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111 # Record any directive attributes in start tags
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112 tag, attrs = data
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113 directives = []
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114 strip = False
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115
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116 if tag in self.DIRECTIVE_NAMESPACE:
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117 cls = self._dir_by_name.get(tag.localname)
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118 if cls is None:
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119 raise BadDirectiveError(tag.localname, self.filepath,
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120 pos[1])
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121 args = dict([(name.localname, value) for name, value
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122 in attrs if not name.namespace])
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123 directives.append((cls, args, ns_prefix.copy(), pos))
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124 strip = True
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125
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126 new_attrs = []
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127 for name, value in attrs:
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128 if name in self.DIRECTIVE_NAMESPACE:
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129 cls = self._dir_by_name.get(name.localname)
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130 if cls is None:
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131 raise BadDirectiveError(name.localname,
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132 self.filepath, pos[1])
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fe40d34fb71d 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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133 directives.append((cls, value, ns_prefix.copy(), pos))
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134 else:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
135 if value:
442
97544725bb7f 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
136 value = list(interpolate(value, self.basedir,
97544725bb7f 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
137 pos[0], pos[1], pos[2],
97544725bb7f 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
138 lookup=self.lookup))
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
139 if len(value) == 1 and value[0][0] is TEXT:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
140 value = value[0][1]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
141 else:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
142 value = [(TEXT, u'', pos)]
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
143 new_attrs.append((name, value))
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
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parents: 362
diff changeset
144 new_attrs = Attrs(new_attrs)
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
145
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
146 if directives:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
147 index = self._dir_order.index
362
fe40d34fb71d 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
148 directives.sort(lambda a, b: cmp(index(a[0]), index(b[0])))
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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parents:
diff changeset
149 dirmap[(depth, tag)] = (directives, len(stream), strip)
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
150
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
151 if tag in self.XINCLUDE_NAMESPACE:
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
152 if tag.localname == 'include':
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
153 include_href = new_attrs.get('href')
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
154 if not include_href:
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
155 raise TemplateSyntaxError('Include misses required '
422
5d08a744636e More work to include absolute file paths in exceptions.
cmlenz
parents: 421
diff changeset
156 'attribute "href"',
5d08a744636e More work to include absolute file paths in exceptions.
cmlenz
parents: 421
diff changeset
157 self.filepath, *pos[1:])
590
36b5a03534a0 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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parents: 552
diff changeset
158 includes.append(include_href)
381
b9fc7a1f76ca 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
159 streams.append([])
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
160 elif tag.localname == 'fallback':
590
36b5a03534a0 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
161 streams.append([])
36b5a03534a0 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
162 fallbacks.append(streams[-1])
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
163
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
164 else:
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
165 stream.append((kind, (tag, new_attrs), pos))
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
166
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
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167 depth += 1
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
168
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
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169 elif kind is END:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
170 depth -= 1
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
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parents: 362
diff changeset
171
590
36b5a03534a0 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 if fallbacks and data == self.XINCLUDE_NAMESPACE['fallback']:
36b5a03534a0 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
173 assert streams.pop() is fallbacks[-1]
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
174 elif data == self.XINCLUDE_NAMESPACE['include']:
590
36b5a03534a0 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
175 fallback = None
36b5a03534a0 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
176 if len(fallbacks) == len(includes):
36b5a03534a0 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
177 fallback = fallbacks.pop()
36b5a03534a0 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
178 streams.pop() # discard anything between the include tags
36b5a03534a0 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
179 # and the fallback element
381
b9fc7a1f76ca 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
180 stream = streams[-1]
590
36b5a03534a0 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
181 stream.append((INCLUDE, (includes.pop(), fallback), pos))
363
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
182 else:
37e4b4bb0b53 Parse template includes at parse time to avoid some runtime overhead.
cmlenz
parents: 362
diff changeset
183 stream.append((kind, data, pos))
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
184
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
185 # If there have have directive attributes with the corresponding
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
186 # start tag, move the events inbetween into a "subprogram"
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
187 if (depth, data) in dirmap:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
188 directives, start_offset, strip = dirmap.pop((depth, data))
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
189 substream = stream[start_offset:]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
190 if strip:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
191 substream = substream[1:-1]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
192 stream[start_offset:] = [(SUB, (directives, substream),
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
193 pos)]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
194
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
195 elif kind is PI and data[0] == 'python':
545
619340e2d805 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
196 if not self.allow_exec:
619340e2d805 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
197 raise TemplateSyntaxError('Python code blocks not allowed',
619340e2d805 Support for Python code blocks in templates can now be disabled. Closes #123.
cmlenz
parents: 520
diff changeset
198 self.filepath, *pos[1:])
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
199 try:
601
59fbd7586454 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
200 suite = Suite(data[1], self.filepath, pos[1],
442
97544725bb7f 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
201 lookup=self.lookup)
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
202 except SyntaxError, err:
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
203 raise TemplateSyntaxError(err, self.filepath,
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
204 pos[1] + (err.lineno or 1) - 1,
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
205 pos[2] + (err.offset or 0))
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
206 stream.append((EXEC, suite, pos))
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
207
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
208 elif kind is TEXT:
442
97544725bb7f 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
209 for kind, data, pos in interpolate(data, self.basedir, pos[0],
97544725bb7f 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
210 pos[1], pos[2],
97544725bb7f 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
211 lookup=self.lookup):
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
212 stream.append((kind, data, pos))
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
213
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
214 elif kind is COMMENT:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
215 if not data.lstrip().startswith('!'):
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
216 stream.append((kind, data, pos))
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
217
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
218 else:
7763f7aec949 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))
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
220
381
b9fc7a1f76ca 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
221 assert len(streams) == 1
b9fc7a1f76ca 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
222 return streams[0]
b9fc7a1f76ca 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
223
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
224 def _exec(self, stream, ctxt):
425
073640758a42 Try to use proper reStructuredText for docstrings throughout.
cmlenz
parents: 422
diff changeset
225 """Internal stream filter that executes code in ``<?python ?>``
073640758a42 Try to use proper reStructuredText for docstrings throughout.
cmlenz
parents: 422
diff changeset
226 processing instructions.
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
227 """
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
228 for event in stream:
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
229 if event[0] is EXEC:
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
230 event[1].execute(_ctxt2dict(ctxt))
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
231 else:
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
232 yield event
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
cmlenz
parents: 400
diff changeset
233
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
234 def _match(self, stream, ctxt, match_templates=None):
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
235 """Internal stream filter that applies any defined match templates
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
236 to the stream.
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
237 """
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
238 if match_templates is None:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
239 match_templates = ctxt._match_templates
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
240
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
241 tail = []
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
242 def _strip(stream):
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
243 depth = 1
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
244 while 1:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
245 event = stream.next()
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
246 if event[0] is START:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
247 depth += 1
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
248 elif event[0] is END:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
249 depth -= 1
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
250 if depth > 0:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
251 yield event
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
252 else:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
253 tail[:] = [event]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
254 break
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
255
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
256 for event in stream:
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
257
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
258 # We (currently) only care about start and end events for matching
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
259 # We might care about namespace events in the future, though
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
260 if not match_templates or (event[0] is not START and
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
261 event[0] is not END):
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
262 yield event
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
263 continue
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
264
602
d7b957e92ea9 Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
265 for idx, (test, path, template, hints, namespaces, directives) \
d7b957e92ea9 Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
266 in enumerate(match_templates):
336
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
267
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
cmlenz
parents:
diff changeset
268 if test(event, namespaces, ctxt) is True:
602
d7b957e92ea9 Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
269 if 'match_once' in hints:
d7b957e92ea9 Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
270 del match_templates[idx]
d7b957e92ea9 Add runtime optimization hints for match templates.
cmlenz
parents: 601
diff changeset
271 idx -= 1
336
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272
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273 # Let the remaining match templates know about the event so
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274 # they get a chance to update their internal state
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275 for test in [mt[0] for mt in match_templates[idx + 1:]]:
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276 test(event, namespaces, ctxt, updateonly=True)
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277
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278 # Consume and store all events until an end event
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279 # corresponding to this start event is encountered
602
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280 inner = _strip(stream)
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281 if 'match_once' not in hints \
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282 and 'not_recursive' not in hints:
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283 inner = self._match(inner, ctxt, [match_templates[idx]])
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284 content = list(self._include(chain([event], inner, tail),
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285 ctxt))
336
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286
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287 for test in [mt[0] for mt in match_templates]:
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288 test(tail[0], namespaces, ctxt, updateonly=True)
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289
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290 # Make the select() function available in the body of the
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291 # match template
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292 def select(path):
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293 return Stream(content).select(path, namespaces, ctxt)
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294 ctxt.push(dict(select=select))
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295
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296 # Recursively process the output
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297 template = _apply_directives(template, ctxt, directives)
602
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298 remaining = match_templates
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299 if 'match_once' not in hints:
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300 remaining = remaining[:idx] + remaining[idx + 1:]
336
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301 for event in self._match(self._eval(self._flatten(template,
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302 ctxt),
602
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303 ctxt), ctxt, remaining):
336
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304 yield event
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305
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306 ctxt.pop()
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307 break
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308
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309 else: # no matches
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310 yield event
363
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311
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312
405
5340931530e2 Support for Python code blocks using the `<?python ?>` processing instruction. Closes #84.
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313 EXEC = MarkupTemplate.EXEC
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