Mercurial > genshi > mirror
annotate genshi/template/directives.py @ 403:228907abb726 trunk
Remove some magic/overhead from `Attrs` creation and manipulation by not automatically wrapping attribute names in `QName`.
author | cmlenz |
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date | Wed, 21 Feb 2007 09:51:43 +0000 |
parents | e29a94b3ba0c |
children | 4675d5cf6c67 |
rev | line source |
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1 # -*- coding: utf-8 -*- |
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2 # |
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3 # Copyright (C) 2006 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 |
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29 |
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30 class DirectiveMeta(type): |
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31 """Meta class for template directives.""" |
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32 |
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33 def __new__(cls, name, bases, d): |
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34 d['tagname'] = name.lower().replace('directive', '') |
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35 return type.__new__(cls, name, bases, d) |
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36 |
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37 |
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38 class Directive(object): |
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39 """Abstract base class for template directives. |
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40 |
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41 A directive is basically a callable that takes three positional arguments: |
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42 `ctxt` is the template data context, `stream` is an iterable over the |
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43 events that the directive applies to, and `directives` is is a list of |
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44 other directives on the same stream that need to be applied. |
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45 |
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46 Directives can be "anonymous" or "registered". Registered directives can be |
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47 applied by the template author using an XML attribute with the |
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48 corresponding name in the template. Such directives should be subclasses of |
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49 this base class that can be instantiated with the value of the directive |
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50 attribute as parameter. |
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51 |
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52 Anonymous directives are simply functions conforming to the protocol |
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53 described above, and can only be applied programmatically (for example by |
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54 template filters). |
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55 """ |
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56 __metaclass__ = DirectiveMeta |
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57 __slots__ = ['expr'] |
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58 |
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59 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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60 offset=-1): |
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61 self.expr = self._parse_expr(value, filename, lineno, offset) |
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62 |
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63 def attach(cls, template, stream, value, namespaces, pos): |
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64 """Called after the template stream has been completely parsed. |
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65 |
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66 @param template: the `Template` object |
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67 @param stream: the event stream associated with the directive |
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68 @param value: the argument value for the directive |
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69 @param namespaces: a mapping of namespace URIs to prefixes |
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70 @param pos: a `(filename, lineno, offset)` tuple describing the location |
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71 where the directive was found in the source |
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72 |
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73 This class method should return a `(directive, stream)` tuple. If |
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74 `directive` is not `None`, it should be an instance of the `Directive` |
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75 class, and gets added to the list of directives applied to the substream |
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76 at runtime. `stream` is an event stream that replaces the original |
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77 stream associated with the directive. |
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78 """ |
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79 return cls(value, namespaces, template.filename, *pos[1:]), stream |
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80 attach = classmethod(attach) |
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81 |
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82 def __call__(self, stream, ctxt, directives): |
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83 """Apply the directive to the given stream. |
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84 |
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85 @param stream: the event stream |
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86 @param ctxt: the context data |
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87 @param directives: a list of the remaining directives that should |
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88 process the stream |
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89 """ |
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90 raise NotImplementedError |
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91 |
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92 def __repr__(self): |
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93 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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94 if getattr(self, 'expr', None) is not None: |
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95 expr = ' "%s"' % self.expr.source |
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96 return '<%s%s>' % (self.__class__.__name__, expr) |
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97 |
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98 def _parse_expr(cls, expr, filename=None, lineno=-1, offset=-1): |
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99 """Parses the given expression, raising a useful error message when a |
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100 syntax error is encountered. |
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101 """ |
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102 try: |
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103 return expr and Expression(expr, filename, lineno) or None |
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104 except SyntaxError, err: |
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105 err.msg += ' in expression "%s" of "%s" directive' % (expr, |
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106 cls.tagname) |
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107 raise TemplateSyntaxError(err, filename, lineno, |
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108 offset + (err.offset or 0)) |
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109 _parse_expr = classmethod(_parse_expr) |
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110 |
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111 |
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112 def _assignment(ast): |
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113 """Takes the AST representation of an assignment, and returns a function |
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114 that applies the assignment of a given value to a dictionary. |
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115 """ |
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116 def _names(node): |
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117 if isinstance(node, (compiler.ast.AssTuple, compiler.ast.Tuple)): |
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118 return tuple([_names(child) for child in node.nodes]) |
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119 elif isinstance(node, (compiler.ast.AssName, compiler.ast.Name)): |
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120 return node.name |
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121 def _assign(data, value, names=_names(ast)): |
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122 if type(names) is tuple: |
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123 for idx in range(len(names)): |
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124 _assign(data, value[idx], names[idx]) |
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125 else: |
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126 data[names] = value |
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127 return _assign |
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128 |
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129 |
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130 class AttrsDirective(Directive): |
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131 """Implementation of the `py:attrs` template directive. |
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132 |
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133 The value of the `py:attrs` attribute should be a dictionary or a sequence |
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134 of `(name, value)` tuples. The items in that dictionary or sequence are |
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135 added as attributes to the element: |
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136 |
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137 >>> from genshi.template import MarkupTemplate |
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138 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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139 ... <li py:attrs="foo">Bar</li> |
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140 ... </ul>''') |
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141 >>> print tmpl.generate(foo={'class': 'collapse'}) |
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142 <ul> |
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143 <li class="collapse">Bar</li> |
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144 </ul> |
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145 >>> print tmpl.generate(foo=[('class', 'collapse')]) |
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146 <ul> |
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147 <li class="collapse">Bar</li> |
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148 </ul> |
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149 |
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150 If the value evaluates to `None` (or any other non-truth value), no |
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151 attributes are added: |
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152 |
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153 >>> print tmpl.generate(foo=None) |
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154 <ul> |
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155 <li>Bar</li> |
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156 </ul> |
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157 """ |
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158 __slots__ = [] |
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159 |
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160 def __call__(self, stream, ctxt, directives): |
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161 def _generate(): |
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162 kind, (tag, attrib), pos = stream.next() |
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163 attrs = self.expr.evaluate(ctxt) |
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164 if attrs: |
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165 if isinstance(attrs, Stream): |
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166 try: |
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167 attrs = iter(attrs).next() |
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168 except StopIteration: |
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169 attrs = [] |
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170 elif not isinstance(attrs, list): # assume it's a dict |
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171 attrs = attrs.items() |
345 | 172 attrib -= [name for name, val in attrs if val is None] |
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173 attrib |= [(QName(name), unicode(val).strip()) for name, val |
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174 in attrs if val is not None] |
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175 yield kind, (tag, attrib), pos |
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176 for event in stream: |
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177 yield event |
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178 |
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179 return _apply_directives(_generate(), ctxt, directives) |
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180 |
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181 |
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182 class ContentDirective(Directive): |
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183 """Implementation of the `py:content` template directive. |
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184 |
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185 This directive replaces the content of the element with the result of |
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186 evaluating the value of the `py:content` attribute: |
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187 |
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188 >>> from genshi.template import MarkupTemplate |
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189 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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190 ... <li py:content="bar">Hello</li> |
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191 ... </ul>''') |
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192 >>> print tmpl.generate(bar='Bye') |
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193 <ul> |
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194 <li>Bye</li> |
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195 </ul> |
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196 """ |
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197 __slots__ = [] |
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198 |
362
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199 def attach(cls, template, stream, value, namespaces, pos): |
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200 expr = cls._parse_expr(value, template.filename, *pos[1:]) |
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201 return None, [stream[0], (EXPR, expr, pos), stream[-1]] |
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202 attach = classmethod(attach) |
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203 |
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204 |
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205 class DefDirective(Directive): |
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206 """Implementation of the `py:def` template directive. |
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207 |
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208 This directive can be used to create "Named Template Functions", which |
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209 are template snippets that are not actually output during normal |
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210 processing, but rather can be expanded from expressions in other places |
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211 in the template. |
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212 |
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213 A named template function can be used just like a normal Python function |
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214 from template expressions: |
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215 |
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216 >>> from genshi.template import MarkupTemplate |
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217 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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218 ... <p py:def="echo(greeting, name='world')" class="message"> |
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219 ... ${greeting}, ${name}! |
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220 ... </p> |
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221 ... ${echo('Hi', name='you')} |
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222 ... </div>''') |
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223 >>> print tmpl.generate(bar='Bye') |
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224 <div> |
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225 <p class="message"> |
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226 Hi, you! |
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227 </p> |
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228 </div> |
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229 |
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230 If a function does not require parameters, the parenthesis can be omitted |
343
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231 in the definition: |
336
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232 |
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233 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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234 ... <p py:def="helloworld" class="message"> |
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235 ... Hello, world! |
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236 ... </p> |
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237 ... ${helloworld()} |
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238 ... </div>''') |
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239 >>> print tmpl.generate(bar='Bye') |
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240 <div> |
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241 <p class="message"> |
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242 Hello, world! |
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243 </p> |
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244 </div> |
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245 """ |
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246 __slots__ = ['name', 'args', 'defaults'] |
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247 |
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248 ATTRIBUTE = 'function' |
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249 |
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250 def __init__(self, args, namespaces=None, filename=None, lineno=-1, |
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251 offset=-1): |
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252 Directive.__init__(self, None, namespaces, filename, lineno, offset) |
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253 ast = _parse(args).node |
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254 self.args = [] |
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255 self.defaults = {} |
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256 if isinstance(ast, compiler.ast.CallFunc): |
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257 self.name = ast.node.name |
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258 for arg in ast.args: |
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259 if isinstance(arg, compiler.ast.Keyword): |
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260 self.args.append(arg.name) |
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261 self.defaults[arg.name] = Expression(arg.expr, filename, |
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262 lineno) |
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263 else: |
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264 self.args.append(arg.name) |
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265 else: |
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266 self.name = ast.name |
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267 |
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268 def __call__(self, stream, ctxt, directives): |
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269 stream = list(stream) |
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270 |
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271 def function(*args, **kwargs): |
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272 scope = {} |
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273 args = list(args) # make mutable |
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274 for name in self.args: |
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275 if args: |
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276 scope[name] = args.pop(0) |
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277 else: |
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278 if name in kwargs: |
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279 val = kwargs.pop(name) |
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280 else: |
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281 val = self.defaults.get(name).evaluate(ctxt) |
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282 scope[name] = val |
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283 ctxt.push(scope) |
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284 for event in _apply_directives(stream, ctxt, directives): |
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285 yield event |
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286 ctxt.pop() |
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287 try: |
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288 function.__name__ = self.name |
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289 except TypeError: |
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290 # Function name can't be set in Python 2.3 |
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291 pass |
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292 |
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293 # Store the function reference in the bottom context frame so that it |
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294 # doesn't get popped off before processing the template has finished |
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295 # FIXME: this makes context data mutable as a side-effect |
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296 ctxt.frames[-1][self.name] = function |
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297 |
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298 return [] |
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299 |
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300 def __repr__(self): |
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301 return '<%s "%s">' % (self.__class__.__name__, self.name) |
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302 |
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303 |
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304 class ForDirective(Directive): |
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305 """Implementation of the `py:for` template directive for repeating an |
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306 element based on an iterable in the context data. |
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307 |
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308 >>> from genshi.template import MarkupTemplate |
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309 >>> tmpl = MarkupTemplate('''<ul xmlns:py="http://genshi.edgewall.org/"> |
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310 ... <li py:for="item in items">${item}</li> |
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311 ... </ul>''') |
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312 >>> print tmpl.generate(items=[1, 2, 3]) |
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313 <ul> |
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314 <li>1</li><li>2</li><li>3</li> |
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315 </ul> |
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316 """ |
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317 __slots__ = ['assign', 'filename'] |
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318 |
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319 ATTRIBUTE = 'each' |
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320 |
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321 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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322 offset=-1): |
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323 if ' in ' not in value: |
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324 raise TemplateSyntaxError('"in" keyword missing in "for" directive', |
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325 filename, lineno, offset) |
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326 assign, value = value.split(' in ', 1) |
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327 ast = _parse(assign, 'exec') |
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328 self.assign = _assignment(ast.node.nodes[0].expr) |
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329 self.filename = filename |
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330 Directive.__init__(self, value.strip(), namespaces, filename, lineno, |
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331 offset) |
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332 |
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333 def __call__(self, stream, ctxt, directives): |
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334 iterable = self.expr.evaluate(ctxt) |
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335 if iterable is None: |
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336 return |
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337 |
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338 assign = self.assign |
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339 scope = {} |
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340 stream = list(stream) |
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341 try: |
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342 iterator = iter(iterable) |
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343 for item in iterator: |
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344 assign(scope, item) |
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345 ctxt.push(scope) |
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346 for event in _apply_directives(stream, ctxt, directives): |
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347 yield event |
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348 ctxt.pop() |
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349 except TypeError, e: |
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350 raise TemplateRuntimeError(str(e), self.filename, *stream[0][2][1:]) |
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351 |
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352 def __repr__(self): |
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353 return '<%s>' % self.__class__.__name__ |
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354 |
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355 |
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356 class IfDirective(Directive): |
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357 """Implementation of the `py:if` template directive for conditionally |
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358 excluding elements from being output. |
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359 |
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360 >>> from genshi.template import MarkupTemplate |
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361 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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362 ... <b py:if="foo">${bar}</b> |
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363 ... </div>''') |
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364 >>> print tmpl.generate(foo=True, bar='Hello') |
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365 <div> |
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366 <b>Hello</b> |
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367 </div> |
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368 """ |
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369 __slots__ = [] |
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370 |
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371 ATTRIBUTE = 'test' |
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372 |
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373 def __call__(self, stream, ctxt, directives): |
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374 if self.expr.evaluate(ctxt): |
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375 return _apply_directives(stream, ctxt, directives) |
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376 return [] |
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377 |
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378 |
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379 class MatchDirective(Directive): |
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380 """Implementation of the `py:match` template directive. |
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381 |
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382 >>> from genshi.template import MarkupTemplate |
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383 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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384 ... <span py:match="greeting"> |
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385 ... Hello ${select('@name')} |
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386 ... </span> |
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387 ... <greeting name="Dude" /> |
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388 ... </div>''') |
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389 >>> print tmpl.generate() |
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390 <div> |
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391 <span> |
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392 Hello Dude |
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393 </span> |
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394 </div> |
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395 """ |
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396 __slots__ = ['path', 'namespaces'] |
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397 |
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398 ATTRIBUTE = 'path' |
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399 |
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400 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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401 offset=-1): |
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402 Directive.__init__(self, None, namespaces, filename, lineno, offset) |
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403 self.path = Path(value, filename, lineno) |
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404 self.namespaces = namespaces or {} |
336
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405 |
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406 def __call__(self, stream, ctxt, directives): |
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407 ctxt._match_templates.append((self.path.test(ignore_context=True), |
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408 self.path, list(stream), self.namespaces, |
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409 directives)) |
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410 return [] |
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411 |
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412 def __repr__(self): |
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413 return '<%s "%s">' % (self.__class__.__name__, self.path.source) |
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414 |
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415 |
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416 class ReplaceDirective(Directive): |
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417 """Implementation of the `py:replace` template directive. |
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418 |
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419 This directive replaces the element with the result of evaluating the |
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420 value of the `py:replace` attribute: |
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421 |
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422 >>> from genshi.template import MarkupTemplate |
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423 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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424 ... <span py:replace="bar">Hello</span> |
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425 ... </div>''') |
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426 >>> print tmpl.generate(bar='Bye') |
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427 <div> |
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428 Bye |
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429 </div> |
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430 |
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431 This directive is equivalent to `py:content` combined with `py:strip`, |
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432 providing a less verbose way to achieve the same effect: |
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433 |
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434 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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435 ... <span py:content="bar" py:strip="">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 """ |
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442 __slots__ = [] |
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443 |
362
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444 def attach(cls, template, stream, value, namespaces, pos): |
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445 expr = cls._parse_expr(value, template.filename, *pos[1:]) |
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446 return None, [(EXPR, expr, pos)] |
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447 attach = classmethod(attach) |
336
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448 |
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449 |
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450 class StripDirective(Directive): |
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451 """Implementation of the `py:strip` template directive. |
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452 |
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453 When the value of the `py:strip` attribute evaluates to `True`, the element |
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454 is stripped from the output |
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455 |
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456 >>> from genshi.template import MarkupTemplate |
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457 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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458 ... <div py:strip="True"><b>foo</b></div> |
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459 ... </div>''') |
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460 >>> print tmpl.generate() |
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461 <div> |
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462 <b>foo</b> |
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463 </div> |
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464 |
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465 Leaving the attribute value empty is equivalent to a truth value. |
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466 |
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467 This directive is particulary interesting for named template functions or |
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468 match templates that do not generate a top-level element: |
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469 |
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470 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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471 ... <div py:def="echo(what)" py:strip=""> |
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472 ... <b>${what}</b> |
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473 ... </div> |
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474 ... ${echo('foo')} |
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475 ... </div>''') |
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476 >>> print tmpl.generate() |
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477 <div> |
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478 <b>foo</b> |
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479 </div> |
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480 """ |
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481 __slots__ = [] |
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482 |
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483 def __call__(self, stream, ctxt, directives): |
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484 def _generate(): |
351
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485 if self.expr.evaluate(ctxt): |
336
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486 stream.next() # skip start tag |
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487 previous = stream.next() |
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488 for event in stream: |
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489 yield previous |
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490 previous = event |
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491 else: |
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492 for event in stream: |
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493 yield event |
351
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494 return _apply_directives(_generate(), ctxt, directives) |
336
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495 |
362
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496 def attach(cls, template, stream, value, namespaces, pos): |
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497 if not value: |
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498 return None, stream[1:-1] |
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499 return super(StripDirective, cls).attach(template, stream, value, |
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500 namespaces, pos) |
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501 attach = classmethod(attach) |
336
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502 |
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503 |
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504 class ChooseDirective(Directive): |
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505 """Implementation of the `py:choose` directive for conditionally selecting |
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506 one of several body elements to display. |
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507 |
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508 If the `py:choose` expression is empty the expressions of nested `py:when` |
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509 directives are tested for truth. The first true `py:when` body is output. |
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510 If no `py:when` directive is matched then the fallback directive |
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511 `py:otherwise` will be used. |
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512 |
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513 >>> from genshi.template import MarkupTemplate |
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514 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/" |
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515 ... py:choose=""> |
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516 ... <span py:when="0 == 1">0</span> |
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517 ... <span py:when="1 == 1">1</span> |
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518 ... <span py:otherwise="">2</span> |
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519 ... </div>''') |
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520 >>> print tmpl.generate() |
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|
521 <div> |
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|
522 <span>1</span> |
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|
523 </div> |
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|
524 |
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|
525 If the `py:choose` directive contains an expression, the nested `py:when` |
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|
526 directives are tested for equality to the `py:choose` expression: |
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|
527 |
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|
528 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/" |
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|
529 ... py:choose="2"> |
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|
530 ... <span py:when="1">1</span> |
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|
531 ... <span py:when="2">2</span> |
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|
532 ... </div>''') |
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|
533 >>> print tmpl.generate() |
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|
534 <div> |
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|
535 <span>2</span> |
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|
536 </div> |
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|
537 |
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|
538 Behavior is undefined if a `py:choose` block contains content outside a |
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|
539 `py:when` or `py:otherwise` block. Behavior is also undefined if a |
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|
540 `py:otherwise` occurs before `py:when` blocks. |
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|
541 """ |
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|
542 __slots__ = ['matched', 'value'] |
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|
543 |
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|
544 ATTRIBUTE = 'test' |
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|
545 |
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|
546 def __call__(self, stream, ctxt, directives): |
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|
547 frame = dict({'_choose.matched': False}) |
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|
548 if self.expr: |
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|
549 frame['_choose.value'] = self.expr.evaluate(ctxt) |
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|
550 ctxt.push(frame) |
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|
551 for event in _apply_directives(stream, ctxt, directives): |
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|
552 yield event |
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|
553 ctxt.pop() |
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|
554 |
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|
555 |
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|
556 class WhenDirective(Directive): |
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|
557 """Implementation of the `py:when` directive for nesting in a parent with |
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|
558 the `py:choose` directive. |
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|
559 |
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|
560 See the documentation of `py:choose` for usage. |
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|
561 """ |
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|
562 __slots__ = ['filename'] |
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|
563 |
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|
564 ATTRIBUTE = 'test' |
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|
565 |
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|
566 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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|
567 offset=-1): |
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|
568 Directive.__init__(self, value, namespaces, filename, lineno, offset) |
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|
569 self.filename = filename |
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|
570 |
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|
571 def __call__(self, stream, ctxt, directives): |
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|
572 matched, frame = ctxt._find('_choose.matched') |
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|
573 if not frame: |
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574 raise TemplateRuntimeError('"when" directives can only be used ' |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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575 'inside a "choose" directive', |
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576 self.filename, *stream.next()[2][1:]) |
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577 if matched: |
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578 return [] |
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579 if not self.expr and '_choose.value' not in frame: |
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580 raise TemplateRuntimeError('either "choose" or "when" directive ' |
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581 'must have a test expression', |
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582 self.filename, *stream.next()[2][1:]) |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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583 if '_choose.value' in frame: |
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584 value = frame['_choose.value'] |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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585 if self.expr: |
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586 matched = value == self.expr.evaluate(ctxt) |
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587 else: |
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588 matched = bool(value) |
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589 else: |
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590 matched = bool(self.expr.evaluate(ctxt)) |
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591 frame['_choose.matched'] = matched |
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592 if not matched: |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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593 return [] |
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|
594 |
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595 return _apply_directives(stream, ctxt, directives) |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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596 |
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|
597 |
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598 class OtherwiseDirective(Directive): |
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599 """Implementation of the `py:otherwise` directive for nesting in a parent |
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600 with the `py:choose` directive. |
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601 |
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|
602 See the documentation of `py:choose` for usage. |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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603 """ |
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604 __slots__ = ['filename'] |
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605 |
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606 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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607 offset=-1): |
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608 Directive.__init__(self, None, namespaces, filename, lineno, offset) |
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609 self.filename = filename |
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610 |
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611 def __call__(self, stream, ctxt, directives): |
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612 matched, frame = ctxt._find('_choose.matched') |
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613 if not frame: |
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|
614 raise TemplateRuntimeError('an "otherwise" directive can only be ' |
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615 'used inside a "choose" directive', |
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616 self.filename, *stream.next()[2][1:]) |
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|
617 if matched: |
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|
618 return [] |
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|
619 frame['_choose.matched'] = True |
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620 |
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621 return _apply_directives(stream, ctxt, directives) |
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622 |
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623 |
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624 class WithDirective(Directive): |
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625 """Implementation of the `py:with` template directive, which allows |
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|
626 shorthand access to variables and expressions. |
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|
627 |
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|
628 >>> from genshi.template import MarkupTemplate |
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629 >>> tmpl = MarkupTemplate('''<div xmlns:py="http://genshi.edgewall.org/"> |
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630 ... <span py:with="y=7; z=x+10">$x $y $z</span> |
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631 ... </div>''') |
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|
632 >>> print tmpl.generate(x=42) |
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|
633 <div> |
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|
634 <span>42 7 52</span> |
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|
635 </div> |
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|
636 """ |
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|
637 __slots__ = ['vars'] |
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|
638 |
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|
639 ATTRIBUTE = 'vars' |
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|
640 |
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|
641 def __init__(self, value, namespaces=None, filename=None, lineno=-1, |
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|
642 offset=-1): |
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|
643 Directive.__init__(self, None, namespaces, filename, lineno, offset) |
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|
644 self.vars = [] |
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|
645 value = value.strip() |
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|
646 try: |
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|
647 ast = _parse(value, 'exec').node |
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|
648 for node in ast.nodes: |
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|
649 if isinstance(node, compiler.ast.Discard): |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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|
650 continue |
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|
651 elif not isinstance(node, compiler.ast.Assign): |
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|
652 raise TemplateSyntaxError('only assignment allowed in ' |
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|
653 'value of the "with" directive', |
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|
654 filename, lineno, offset) |
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|
655 self.vars.append(([_assignment(n) for n in node.nodes], |
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|
656 Expression(node.expr, filename, lineno))) |
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|
657 except SyntaxError, err: |
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|
658 err.msg += ' in expression "%s" of "%s" directive' % (value, |
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Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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|
659 self.tagname) |
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|
660 raise TemplateSyntaxError(err, filename, lineno, |
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|
661 offset + (err.offset or 0)) |
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|
662 |
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|
663 def __call__(self, stream, ctxt, directives): |
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|
664 frame = {} |
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|
665 ctxt.push(frame) |
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|
666 for targets, expr in self.vars: |
343
35189e960252
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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336
diff
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|
667 value = expr.evaluate(ctxt) |
336
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|
668 for assign in targets: |
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|
669 assign(frame, value) |
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|
670 for event in _apply_directives(stream, ctxt, directives): |
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|
671 yield event |
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|
672 ctxt.pop() |
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|
673 |
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|
674 def __repr__(self): |
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|
675 return '<%s>' % (self.__class__.__name__) |