Mercurial > genshi > mirror
annotate genshi/template/directives.py @ 480:2f46ae8deae2 stable-0.4.x
Ported [579] (for #116) to 0.4.x.
author | cmlenz |
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date | Mon, 14 May 2007 20:34:51 +0000 |
parents | 97544725bb7f |
children | b59d99d2f631 |
rev | line source |
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1 # -*- coding: utf-8 -*- |
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2 # |
408 | 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 """Implementation of the various template directives.""" |
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15 |
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16 import compiler |
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17 |
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Remove some magic/overhead from `Attrs` creation and manipulation by not automatically wrapping attribute names in `QName`.
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18 from genshi.core import Attrs, QName, Stream |
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19 from genshi.path import Path |
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20 from genshi.template.base import TemplateRuntimeError, TemplateSyntaxError, \ |
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21 EXPR, _apply_directives |
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22 from genshi.template.eval import Expression, _parse |
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23 |
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24 __all__ = ['AttrsDirective', 'ChooseDirective', 'ContentDirective', |
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25 'DefDirective', 'ForDirective', 'IfDirective', 'MatchDirective', |
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26 'OtherwiseDirective', 'ReplaceDirective', 'StripDirective', |
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27 'WhenDirective', 'WithDirective'] |
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28 __docformat__ = 'restructuredtext en' |
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29 |
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30 |
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31 class DirectiveMeta(type): |
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32 """Meta class for template directives.""" |
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33 |
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34 def __new__(cls, name, bases, d): |
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35 d['tagname'] = name.lower().replace('directive', '') |
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36 return type.__new__(cls, name, bases, d) |
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37 |
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38 |
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39 class Directive(object): |
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40 """Abstract base class for template directives. |
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41 |
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42 A directive is basically a callable that takes three positional arguments: |
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43 ``ctxt`` is the template data context, ``stream`` is an iterable over the |
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44 events that the directive applies to, and ``directives`` is is a list of |
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45 other directives on the same stream that need to be applied. |
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46 |
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47 Directives can be "anonymous" or "registered". Registered directives can be |
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48 applied by the template author using an XML attribute with the |
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49 corresponding name in the template. Such directives should be subclasses of |
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50 this base class that can be instantiated with the value of the directive |
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51 attribute as parameter. |
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52 |
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53 Anonymous directives are simply functions conforming to the protocol |
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54 described above, and can only be applied programmatically (for example by |
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55 template filters). |
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56 """ |
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57 __metaclass__ = DirectiveMeta |
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58 __slots__ = ['expr'] |
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59 |
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60 def __init__(self, value, template=None, namespaces=None, lineno=-1, |
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61 offset=-1): |
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62 self.expr = self._parse_expr(value, template, lineno, offset) |
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63 |
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64 def attach(cls, template, stream, value, namespaces, pos): |
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65 """Called after the template stream has been completely parsed. |
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66 |
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67 :param template: the `Template` object |
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68 :param stream: the event stream associated with the directive |
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69 :param value: the argument value for the directive |
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70 :param namespaces: a mapping of namespace URIs to prefixes |
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71 :param pos: a ``(filename, lineno, offset)`` tuple describing the |
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72 location where the directive was found in the source |
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73 |
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74 This class method should return a ``(directive, stream)`` tuple. If |
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75 ``directive`` is not ``None``, it should be an instance of the `Directive` |
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76 class, and gets added to the list of directives applied to the substream |
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77 at runtime. `stream` is an event stream that replaces the original |
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78 stream associated with the directive. |
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79 """ |
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80 return cls(value, template, namespaces, *pos[1:]), stream |
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81 attach = classmethod(attach) |
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82 |
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83 def __call__(self, stream, ctxt, directives): |
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84 """Apply the directive to the given stream. |
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85 |
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86 :param stream: the event stream |
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87 :param ctxt: the context data |
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88 :param directives: a list of the remaining directives that should |
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89 process the stream |
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90 """ |
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91 raise NotImplementedError |
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92 |
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93 def __repr__(self): |
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94 expr = '' |
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Fail gracefully in `Directive.__repr__` if the `expr` attribute does not exist for some reason I don't really understand right now (see Trac ticket [http://trac.edgewall.org/ticket/4249 #4249]).
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95 if getattr(self, 'expr', None) is not None: |
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96 expr = ' "%s"' % self.expr.source |
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97 return '<%s%s>' % (self.__class__.__name__, expr) |
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98 |
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99 def _parse_expr(cls, expr, template, lineno=-1, offset=-1): |
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100 """Parses the given expression, raising a useful error message when a |
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101 syntax error is encountered. |
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102 """ |
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103 try: |
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104 return expr and Expression(expr, template.filepath, lineno, |
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105 lookup=template.lookup) or None |
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106 except SyntaxError, err: |
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107 err.msg += ' in expression "%s" of "%s" directive' % (expr, |
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108 cls.tagname) |
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109 raise TemplateSyntaxError(err, template.filepath, lineno, |
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110 offset + (err.offset or 0)) |
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111 _parse_expr = classmethod(_parse_expr) |
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112 |
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113 |
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114 def _assignment(ast): |
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115 """Takes the AST representation of an assignment, and returns a function |
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116 that applies the assignment of a given value to a dictionary. |
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117 """ |
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118 def _names(node): |
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119 if isinstance(node, (compiler.ast.AssTuple, compiler.ast.Tuple)): |
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120 return tuple([_names(child) for child in node.nodes]) |
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121 elif isinstance(node, (compiler.ast.AssName, compiler.ast.Name)): |
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122 return node.name |
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123 def _assign(data, value, names=_names(ast)): |
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124 if type(names) is tuple: |
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125 for idx in range(len(names)): |
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126 _assign(data, value[idx], names[idx]) |
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127 else: |
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128 data[names] = value |
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129 return _assign |
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130 |
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131 |
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132 class AttrsDirective(Directive): |
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133 """Implementation of the ``py:attrs`` template directive. |
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134 |
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135 The value of the ``py:attrs`` attribute should be a dictionary or a sequence |
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136 of ``(name, value)`` tuples. The items in that dictionary or sequence are |
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137 added as attributes to the element: |
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138 |
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139 >>> from genshi.template import MarkupTemplate |
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140 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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141 ... <li py:attrs="foo">Bar</li> |
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142 ... </ul>''') |
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143 >>> print tmpl.generate(foo={'class': 'collapse'}) |
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144 <ul> |
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145 <li class="collapse">Bar</li> |
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146 </ul> |
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147 >>> print tmpl.generate(foo=[('class', 'collapse')]) |
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148 <ul> |
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149 <li class="collapse">Bar</li> |
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150 </ul> |
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151 |
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152 If the value evaluates to ``None`` (or any other non-truth value), no |
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153 attributes are added: |
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154 |
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155 >>> print tmpl.generate(foo=None) |
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156 <ul> |
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157 <li>Bar</li> |
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158 </ul> |
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159 """ |
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160 __slots__ = [] |
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161 |
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162 def __call__(self, stream, ctxt, directives): |
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163 def _generate(): |
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164 kind, (tag, attrib), pos = stream.next() |
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165 attrs = self.expr.evaluate(ctxt) |
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166 if attrs: |
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167 if isinstance(attrs, Stream): |
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168 try: |
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169 attrs = iter(attrs).next() |
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170 except StopIteration: |
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171 attrs = [] |
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172 elif not isinstance(attrs, list): # assume it's a dict |
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173 attrs = attrs.items() |
345 | 174 attrib -= [name for name, val in attrs if val is None] |
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175 attrib |= [(QName(name), unicode(val).strip()) for name, val |
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176 in attrs if val is not None] |
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177 yield kind, (tag, attrib), pos |
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178 for event in stream: |
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179 yield event |
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180 |
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181 return _apply_directives(_generate(), ctxt, directives) |
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182 |
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183 |
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184 class ContentDirective(Directive): |
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185 """Implementation of the ``py:content`` template directive. |
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186 |
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187 This directive replaces the content of the element with the result of |
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188 evaluating the value of the ``py:content`` attribute: |
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189 |
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190 >>> from genshi.template import MarkupTemplate |
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191 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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192 ... <li py:content="bar">Hello</li> |
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193 ... </ul>''') |
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194 >>> print tmpl.generate(bar='Bye') |
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195 <ul> |
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196 <li>Bye</li> |
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197 </ul> |
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198 """ |
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199 __slots__ = [] |
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200 |
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201 def attach(cls, template, stream, value, namespaces, pos): |
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202 expr = cls._parse_expr(value, template, *pos[1:]) |
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203 return None, [stream[0], (EXPR, expr, pos), stream[-1]] |
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204 attach = classmethod(attach) |
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205 |
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206 |
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207 class DefDirective(Directive): |
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208 """Implementation of the ``py:def`` template directive. |
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209 |
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210 This directive can be used to create "Named Template Functions", which |
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211 are template snippets that are not actually output during normal |
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212 processing, but rather can be expanded from expressions in other places |
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213 in the template. |
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214 |
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215 A named template function can be used just like a normal Python function |
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216 from template expressions: |
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217 |
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218 >>> from genshi.template import MarkupTemplate |
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219 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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220 ... <p py:def="echo(greeting, name='world')" class="message"> |
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221 ... ${greeting}, ${name}! |
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222 ... </p> |
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223 ... ${echo('Hi', name='you')} |
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224 ... </div>''') |
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225 >>> print tmpl.generate(bar='Bye') |
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226 <div> |
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227 <p class="message"> |
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228 Hi, you! |
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229 </p> |
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230 </div> |
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231 |
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232 If a function does not require parameters, the parenthesis can be omitted |
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233 in the definition: |
336
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234 |
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235 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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236 ... <p py:def="helloworld" class="message"> |
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237 ... Hello, world! |
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238 ... </p> |
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239 ... ${helloworld()} |
336
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240 ... </div>''') |
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241 >>> print tmpl.generate(bar='Bye') |
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242 <div> |
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243 <p class="message"> |
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244 Hello, world! |
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245 </p> |
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246 </div> |
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247 """ |
480 | 248 __slots__ = ['name', 'args', 'star_args', 'dstar_args', 'defaults'] |
336
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249 |
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250 ATTRIBUTE = 'function' |
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251 |
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252 def __init__(self, args, template, namespaces=None, lineno=-1, offset=-1): |
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253 Directive.__init__(self, None, template, namespaces, lineno, offset) |
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254 ast = _parse(args).node |
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255 self.args = [] |
480 | 256 self.star_args = None |
257 self.dstar_args = None | |
336
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258 self.defaults = {} |
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259 if isinstance(ast, compiler.ast.CallFunc): |
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260 self.name = ast.node.name |
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261 for arg in ast.args: |
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262 if isinstance(arg, compiler.ast.Keyword): |
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263 self.args.append(arg.name) |
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264 self.defaults[arg.name] = Expression(arg.expr, |
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265 template.filepath, |
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266 lineno, |
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267 lookup=template.lookup) |
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268 else: |
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269 self.args.append(arg.name) |
480 | 270 if ast.star_args: |
271 self.star_args = ast.star_args.name | |
272 if ast.dstar_args: | |
273 self.dstar_args = ast.dstar_args.name | |
336
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274 else: |
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275 self.name = ast.name |
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276 |
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277 def __call__(self, stream, ctxt, directives): |
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278 stream = list(stream) |
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279 |
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280 def function(*args, **kwargs): |
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281 scope = {} |
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282 args = list(args) # make mutable |
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283 for name in self.args: |
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284 if args: |
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285 scope[name] = args.pop(0) |
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286 else: |
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287 if name in kwargs: |
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288 val = kwargs.pop(name) |
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289 else: |
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290 val = self.defaults.get(name).evaluate(ctxt) |
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291 scope[name] = val |
480 | 292 if not self.star_args is None: |
293 scope[self.star_args] = args | |
294 if not self.dstar_args is None: | |
295 scope[self.dstar_args] = kwargs | |
336
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296 ctxt.push(scope) |
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297 for event in _apply_directives(stream, ctxt, directives): |
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298 yield event |
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299 ctxt.pop() |
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300 try: |
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301 function.__name__ = self.name |
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302 except TypeError: |
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303 # Function name can't be set in Python 2.3 |
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304 pass |
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305 |
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306 # Store the function reference in the bottom context frame so that it |
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307 # doesn't get popped off before processing the template has finished |
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308 # FIXME: this makes context data mutable as a side-effect |
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309 ctxt.frames[-1][self.name] = function |
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310 |
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311 return [] |
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312 |
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313 def __repr__(self): |
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314 return '<%s "%s">' % (self.__class__.__name__, self.name) |
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315 |
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316 |
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317 class ForDirective(Directive): |
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318 """Implementation of the ``py:for`` template directive for repeating an |
336
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319 element based on an iterable in the context data. |
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320 |
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321 >>> from genshi.template import MarkupTemplate |
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322 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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323 ... <li py:for="item in items">${item}</li> |
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324 ... </ul>''') |
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325 >>> print tmpl.generate(items=[1, 2, 3]) |
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326 <ul> |
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327 <li>1</li><li>2</li><li>3</li> |
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328 </ul> |
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329 """ |
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330 __slots__ = ['assign', 'filename'] |
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331 |
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332 ATTRIBUTE = 'each' |
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333 |
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334 def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1): |
336
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335 if ' in ' not in value: |
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336 raise TemplateSyntaxError('"in" keyword missing in "for" directive', |
442
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337 template.filepath, lineno, offset) |
336
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338 assign, value = value.split(' in ', 1) |
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339 ast = _parse(assign, 'exec') |
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340 self.assign = _assignment(ast.node.nodes[0].expr) |
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341 self.filename = template.filepath |
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342 Directive.__init__(self, value.strip(), template, namespaces, lineno, |
336
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343 offset) |
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344 |
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345 def __call__(self, stream, ctxt, directives): |
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346 iterable = self.expr.evaluate(ctxt) |
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347 if iterable is None: |
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348 return |
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349 |
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350 assign = self.assign |
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351 scope = {} |
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352 stream = list(stream) |
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353 try: |
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354 iterator = iter(iterable) |
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355 for item in iterator: |
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356 assign(scope, item) |
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357 ctxt.push(scope) |
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358 for event in _apply_directives(stream, ctxt, directives): |
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359 yield event |
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360 ctxt.pop() |
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361 except TypeError, e: |
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362 raise TemplateRuntimeError(str(e), self.filename, *stream[0][2][1:]) |
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363 |
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364 def __repr__(self): |
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365 return '<%s>' % self.__class__.__name__ |
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366 |
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367 |
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368 class IfDirective(Directive): |
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369 """Implementation of the ``py:if`` template directive for conditionally |
336
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370 excluding elements from being output. |
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371 |
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372 >>> from genshi.template import MarkupTemplate |
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373 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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374 ... <b py:if="foo">${bar}</b> |
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375 ... </div>''') |
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376 >>> print tmpl.generate(foo=True, bar='Hello') |
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377 <div> |
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378 <b>Hello</b> |
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379 </div> |
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380 """ |
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381 __slots__ = [] |
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382 |
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383 ATTRIBUTE = 'test' |
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384 |
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385 def __call__(self, stream, ctxt, directives): |
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386 if self.expr.evaluate(ctxt): |
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387 return _apply_directives(stream, ctxt, directives) |
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388 return [] |
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389 |
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390 |
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391 class MatchDirective(Directive): |
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392 """Implementation of the ``py:match`` template directive. |
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393 |
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394 >>> from genshi.template import MarkupTemplate |
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395 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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396 ... <span py:match="greeting"> |
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397 ... Hello ${select('@name')} |
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398 ... </span> |
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399 ... <greeting name="Dude" /> |
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400 ... </div>''') |
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401 >>> print tmpl.generate() |
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402 <div> |
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403 <span> |
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404 Hello Dude |
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405 </span> |
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406 </div> |
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407 """ |
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408 __slots__ = ['path', 'namespaces'] |
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409 |
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410 ATTRIBUTE = 'path' |
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411 |
442
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412 def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1): |
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413 Directive.__init__(self, None, template, namespaces, lineno, offset) |
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414 self.path = Path(value, template.filepath, lineno) |
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415 self.namespaces = namespaces or {} |
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416 |
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417 def __call__(self, stream, ctxt, directives): |
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418 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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419 self.path, list(stream), self.namespaces, |
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420 directives)) |
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421 return [] |
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422 |
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423 def __repr__(self): |
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424 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
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425 |
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426 |
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427 class ReplaceDirective(Directive): |
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428 """Implementation of the ``py:replace`` template directive. |
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429 |
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430 This directive replaces the element with the result of evaluating the |
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431 value of the ``py:replace`` attribute: |
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432 |
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433 >>> from genshi.template import MarkupTemplate |
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434 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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435 ... <span py:replace="bar">Hello</span> |
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436 ... </div>''') |
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437 >>> print tmpl.generate(bar='Bye') |
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438 <div> |
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439 Bye |
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440 </div> |
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441 |
425
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442 This directive is equivalent to ``py:content`` combined with ``py:strip``, |
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443 providing a less verbose way to achieve the same effect: |
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444 |
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445 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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446 ... <span py:content="bar" py:strip="">Hello</span> |
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447 ... </div>''') |
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448 >>> print tmpl.generate(bar='Bye') |
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449 <div> |
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450 Bye |
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451 </div> |
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452 """ |
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453 __slots__ = [] |
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454 |
362
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455 def attach(cls, template, stream, value, namespaces, pos): |
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456 if not value: |
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457 raise TemplateSyntaxError('missing value for "replace" directive', |
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458 template.filepath, *pos[1:]) |
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459 expr = cls._parse_expr(value, template, *pos[1:]) |
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460 return None, [(EXPR, expr, pos)] |
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461 attach = classmethod(attach) |
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462 |
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463 |
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464 class StripDirective(Directive): |
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465 """Implementation of the ``py:strip`` template directive. |
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466 |
425
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467 When the value of the ``py:strip`` attribute evaluates to ``True``, the |
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468 element is stripped from the output |
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469 |
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470 >>> from genshi.template import MarkupTemplate |
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471 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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472 ... <div py:strip="True"><b>foo</b></div> |
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473 ... </div>''') |
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474 >>> print tmpl.generate() |
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475 <div> |
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476 <b>foo</b> |
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477 </div> |
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478 |
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479 Leaving the attribute value empty is equivalent to a truth value. |
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480 |
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481 This directive is particulary interesting for named template functions or |
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482 match templates that do not generate a top-level element: |
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483 |
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484 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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485 ... <div py:def="echo(what)" py:strip=""> |
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486 ... <b>${what}</b> |
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487 ... </div> |
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488 ... ${echo('foo')} |
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489 ... </div>''') |
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490 >>> print tmpl.generate() |
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491 <div> |
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492 <b>foo</b> |
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493 </div> |
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494 """ |
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495 __slots__ = [] |
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496 |
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497 def __call__(self, stream, ctxt, directives): |
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498 def _generate(): |
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499 if self.expr.evaluate(ctxt): |
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500 stream.next() # skip start tag |
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501 previous = stream.next() |
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502 for event in stream: |
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503 yield previous |
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504 previous = event |
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505 else: |
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506 for event in stream: |
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507 yield event |
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508 return _apply_directives(_generate(), ctxt, directives) |
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509 |
362
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510 def attach(cls, template, stream, value, namespaces, pos): |
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511 if not value: |
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512 return None, stream[1:-1] |
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513 return super(StripDirective, cls).attach(template, stream, value, |
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514 namespaces, pos) |
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515 attach = classmethod(attach) |
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516 |
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517 |
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518 class ChooseDirective(Directive): |
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519 """Implementation of the ``py:choose`` directive for conditionally selecting |
336
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520 one of several body elements to display. |
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521 |
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522 If the ``py:choose`` expression is empty the expressions of nested |
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523 ``py:when`` directives are tested for truth. The first true ``py:when`` |
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524 body is output. If no ``py:when`` directive is matched then the fallback |
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525 directive ``py:otherwise`` will be used. |
336
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526 |
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527 >>> from genshi.template import MarkupTemplate |
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528 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/" |
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529 ... py:choose=""> |
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530 ... <span py:when="0 == 1">0</span> |
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531 ... <span py:when="1 == 1">1</span> |
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532 ... <span py:otherwise="">2</span> |
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533 ... </div>''') |
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534 >>> print tmpl.generate() |
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|
535 <div> |
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|
536 <span>1</span> |
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|
537 </div> |
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|
538 |
425
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|
539 If the ``py:choose`` directive contains an expression, the nested |
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|
540 ``py:when`` directives are tested for equality to the ``py:choose`` |
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|
541 expression: |
336
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542 |
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|
543 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/" |
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544 ... py:choose="2"> |
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|
545 ... <span py:when="1">1</span> |
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546 ... <span py:when="2">2</span> |
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547 ... </div>''') |
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|
548 >>> print tmpl.generate() |
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|
549 <div> |
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|
550 <span>2</span> |
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|
551 </div> |
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|
552 |
425
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|
553 Behavior is undefined if a ``py:choose`` block contains content outside a |
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|
554 ``py:when`` or ``py:otherwise`` block. Behavior is also undefined if a |
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|
555 ``py:otherwise`` occurs before ``py:when`` blocks. |
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|
556 """ |
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|
557 __slots__ = ['matched', 'value'] |
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|
558 |
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|
559 ATTRIBUTE = 'test' |
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|
560 |
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|
561 def __call__(self, stream, ctxt, directives): |
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|
562 frame = dict({'_choose.matched': False}) |
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563 if self.expr: |
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|
564 frame['_choose.value'] = self.expr.evaluate(ctxt) |
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|
565 ctxt.push(frame) |
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|
566 for event in _apply_directives(stream, ctxt, directives): |
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|
567 yield event |
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|
568 ctxt.pop() |
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|
569 |
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|
570 |
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|
571 class WhenDirective(Directive): |
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572 """Implementation of the ``py:when`` directive for nesting in a parent with |
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|
573 the ``py:choose`` directive. |
336
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|
574 |
425
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|
575 See the documentation of the `ChooseDirective` for usage. |
336
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|
576 """ |
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|
577 __slots__ = ['filename'] |
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|
578 |
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|
579 ATTRIBUTE = 'test' |
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|
580 |
442
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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.
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|
581 def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1): |
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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.
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diff
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|
582 Directive.__init__(self, value, template, namespaces, lineno, offset) |
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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.
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|
583 self.filename = template.filepath |
336
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|
584 |
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|
585 def __call__(self, stream, ctxt, directives): |
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|
586 matched, frame = ctxt._find('_choose.matched') |
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587 if not frame: |
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588 raise TemplateRuntimeError('"when" directives can only be used ' |
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589 'inside a "choose" directive', |
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590 self.filename, *stream.next()[2][1:]) |
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591 if matched: |
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592 return [] |
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593 if not self.expr and '_choose.value' not in frame: |
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594 raise TemplateRuntimeError('either "choose" or "when" directive ' |
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595 'must have a test expression', |
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596 self.filename, *stream.next()[2][1:]) |
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597 if '_choose.value' in frame: |
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598 value = frame['_choose.value'] |
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599 if self.expr: |
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600 matched = value == self.expr.evaluate(ctxt) |
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601 else: |
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602 matched = bool(value) |
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603 else: |
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604 matched = bool(self.expr.evaluate(ctxt)) |
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605 frame['_choose.matched'] = matched |
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606 if not matched: |
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607 return [] |
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608 |
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609 return _apply_directives(stream, ctxt, directives) |
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610 |
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611 |
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612 class OtherwiseDirective(Directive): |
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613 """Implementation of the ``py:otherwise`` directive for nesting in a parent |
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614 with the ``py:choose`` directive. |
336
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615 |
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616 See the documentation of `ChooseDirective` for usage. |
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617 """ |
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618 __slots__ = ['filename'] |
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619 |
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620 def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1): |
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621 Directive.__init__(self, None, template, namespaces, lineno, offset) |
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622 self.filename = template.filepath |
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623 |
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624 def __call__(self, stream, ctxt, directives): |
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625 matched, frame = ctxt._find('_choose.matched') |
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626 if not frame: |
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627 raise TemplateRuntimeError('an "otherwise" directive can only be ' |
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628 'used inside a "choose" directive', |
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629 self.filename, *stream.next()[2][1:]) |
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630 if matched: |
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|
631 return [] |
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632 frame['_choose.matched'] = True |
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633 |
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634 return _apply_directives(stream, ctxt, directives) |
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635 |
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|
636 |
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637 class WithDirective(Directive): |
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638 """Implementation of the ``py:with`` template directive, which allows |
336
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639 shorthand access to variables and expressions. |
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640 |
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|
641 >>> from genshi.template import MarkupTemplate |
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642 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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643 ... <span py:with="y=7; z=x+10">$x $y $z</span> |
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644 ... </div>''') |
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645 >>> print tmpl.generate(x=42) |
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646 <div> |
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|
647 <span>42 7 52</span> |
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648 </div> |
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649 """ |
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650 __slots__ = ['vars'] |
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651 |
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652 ATTRIBUTE = 'vars' |
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653 |
442
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654 def __init__(self, value, template, namespaces=None, lineno=-1, offset=-1): |
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655 Directive.__init__(self, None, template, namespaces, lineno, offset) |
336
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656 self.vars = [] |
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657 value = value.strip() |
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|
658 try: |
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|
659 ast = _parse(value, 'exec').node |
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|
660 for node in ast.nodes: |
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|
661 if isinstance(node, compiler.ast.Discard): |
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|
662 continue |
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|
663 elif not isinstance(node, compiler.ast.Assign): |
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|
664 raise TemplateSyntaxError('only assignment allowed in ' |
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|
665 'value of the "with" directive', |
442
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|
666 template.filepath, lineno, offset) |
336
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|
667 self.vars.append(([_assignment(n) for n in node.nodes], |
442
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|
668 Expression(node.expr, template.filepath, |
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|
669 lineno, lookup=template.lookup))) |
336
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670 except SyntaxError, err: |
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671 err.msg += ' in expression "%s" of "%s" directive' % (value, |
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|
672 self.tagname) |
442
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436
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|
673 raise TemplateSyntaxError(err, template.filepath, lineno, |
336
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|
674 offset + (err.offset or 0)) |
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|
675 |
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|
676 def __call__(self, stream, ctxt, directives): |
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|
677 frame = {} |
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|
678 ctxt.push(frame) |
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|
679 for targets, expr in self.vars: |
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Remove automatic calling of expression evaluation results if they are callable. See [http://groups.google.com/group/genshi/browse_thread/thread/f515986760918d41 this mailing list thread].
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|
680 value = expr.evaluate(ctxt) |
336
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|
681 for assign in targets: |
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|
682 assign(frame, value) |
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|
683 for event in _apply_directives(stream, ctxt, directives): |
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|
684 yield event |
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|
685 ctxt.pop() |
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|
686 |
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|
687 def __repr__(self): |
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|
688 return '<%s>' % (self.__class__.__name__) |