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annotate genshi/template/eval.py @ 401:68772732c896 trunk

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Make the `Markup` class available by default in template expressions. Closes #67.
author cmlenz
date Thu, 18 Jan 2007 15:41:47 +0000
parents 7016f404b915
children 5340931530e2
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 """Support for "safe" evaluation of Python expressions."""
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15
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16 import __builtin__
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17 from compiler import ast, parse
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18 from compiler.pycodegen import ExpressionCodeGenerator
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19 import new
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20 try:
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21 set
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22 except NameError:
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23 from sets import Set as set
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24
401
68772732c896 Make the `Markup` class available by default in template expressions. Closes #67.
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25 from genshi.core import Markup
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26 from genshi.util import flatten
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27
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28 __all__ = ['Expression', 'Undefined']
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29
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30
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31 class Expression(object):
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32 """Evaluates Python expressions used in templates.
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33
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34 >>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
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35 >>> Expression('test').evaluate(data)
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36 'Foo'
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37
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38 >>> Expression('items[0]').evaluate(data)
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39 1
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40 >>> Expression('items[-1]').evaluate(data)
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41 3
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42 >>> Expression('dict["some"]').evaluate(data)
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43 'thing'
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44
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45 Similar to e.g. Javascript, expressions in templates can use the dot
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46 notation for attribute access to access items in mappings:
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47
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48 >>> Expression('dict.some').evaluate(data)
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49 'thing'
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50
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51 This also works the other way around: item access can be used to access
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52 any object attribute (meaning there's no use for `getattr()` in templates):
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53
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54 >>> class MyClass(object):
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55 ... myattr = 'Bar'
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56 >>> data = dict(mine=MyClass(), key='myattr')
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57 >>> Expression('mine.myattr').evaluate(data)
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58 'Bar'
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59 >>> Expression('mine["myattr"]').evaluate(data)
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60 'Bar'
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61 >>> Expression('mine[key]').evaluate(data)
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62 'Bar'
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63
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64 All of the standard Python operators are available to template expressions.
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65 Built-in functions such as `len()` are also available in template
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66 expressions:
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67
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68 >>> data = dict(items=[1, 2, 3])
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69 >>> Expression('len(items)').evaluate(data)
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70 3
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71 """
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72 __slots__ = ['source', 'code']
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73
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74 def __init__(self, source, filename=None, lineno=-1):
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75 """Create the expression, either from a string, or from an AST node.
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76
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77 @param source: either a string containing the source code of the
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78 expression, or an AST node
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79 @param filename: the (preferably absolute) name of the file containing
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80 the expression
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81 @param lineno: the number of the line on which the expression was found
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82 """
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83 if isinstance(source, basestring):
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84 self.source = source
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85 self.code = _compile(_parse(source), self.source, filename=filename,
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86 lineno=lineno)
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87 else:
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88 assert isinstance(source, ast.Node)
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89 self.source = '?'
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90 self.code = _compile(ast.Expression(source), filename=filename,
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91 lineno=lineno)
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92
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93 def __eq__(self, other):
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94 return (type(other) == Expression) and (self.code == other.code)
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95
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96 def __hash__(self):
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97 return hash(self.code)
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98
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99 def __ne__(self, other):
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100 return not self == other
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101
336
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102 def __repr__(self):
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103 return 'Expression(%r)' % self.source
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104
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105 def evaluate(self, data):
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106 """Evaluate the expression against the given data dictionary.
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107
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108 @param data: a mapping containing the data to evaluate against
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109 @return: the result of the evaluation
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110 """
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111 return eval(self.code, {'data': data,
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112 '_lookup_name': _lookup_name,
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113 '_lookup_attr': _lookup_attr,
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114 '_lookup_item': _lookup_item},
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115 {'data': data})
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116
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117
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118 class Undefined(object):
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119 """Represents a reference to an undefined variable.
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120
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121 Unlike the Python runtime, template expressions can refer to an undefined
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122 variable without causing a `NameError` to be raised. The result will be an
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123 instance of the `Undefined´ class, which is treated the same as `False` in
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124 conditions, and acts as an empty collection in iterations:
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125
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126 >>> foo = Undefined('foo')
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127 >>> bool(foo)
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128 False
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129 >>> list(foo)
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130 []
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131 >>> print foo
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132 undefined
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133
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134 However, calling an undefined variable, or trying to access an attribute
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135 of that variable, will raise an exception that includes the name used to
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136 reference that undefined variable.
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137
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138 >>> foo('bar')
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139 Traceback (most recent call last):
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140 ...
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141 NameError: Variable "foo" is not defined
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142
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143 >>> foo.bar
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144 Traceback (most recent call last):
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145 ...
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146 NameError: Variable "foo" is not defined
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147 """
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148 __slots__ = ['_name']
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149
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150 def __init__(self, name):
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151 self._name = name
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152
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153 def __call__(self, *args, **kwargs):
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154 __traceback_hide__ = True
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155 self.throw()
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156
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157 def __getattr__(self, name):
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158 __traceback_hide__ = True
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159 self.throw()
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160
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161 def __iter__(self):
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162 return iter([])
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163
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164 def __nonzero__(self):
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165 return False
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166
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167 def __repr__(self):
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168 return 'undefined'
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169
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170 def throw(self):
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171 __traceback_hide__ = True
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172 raise NameError('Variable "%s" is not defined' % self._name)
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173
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174
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175 def _parse(source, mode='eval'):
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176 if isinstance(source, unicode):
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177 source = '\xef\xbb\xbf' + source.encode('utf-8')
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178 return parse(source, mode)
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179
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180 def _compile(node, source=None, filename=None, lineno=-1):
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181 tree = ExpressionASTTransformer().visit(node)
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182 if isinstance(filename, unicode):
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183 # unicode file names not allowed for code objects
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184 filename = filename.encode('utf-8', 'replace')
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185 elif not filename:
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186 filename = '<string>'
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187 tree.filename = filename
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188 if lineno <= 0:
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189 lineno = 1
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190
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191 gen = ExpressionCodeGenerator(tree)
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192 gen.optimized = True
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193 code = gen.getCode()
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194
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195 # We'd like to just set co_firstlineno, but it's readonly. So we need to
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196 # clone the code object while adjusting the line number
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197 return new.code(0, code.co_nlocals, code.co_stacksize,
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198 code.co_flags | 0x0040, code.co_code, code.co_consts,
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199 code.co_names, code.co_varnames, filename,
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200 '<Expression %s>' % (repr(source or '?').replace("'", '"')),
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201 lineno, code.co_lnotab, (), ())
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202
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203 BUILTINS = __builtin__.__dict__.copy()
401
68772732c896 Make the `Markup` class available by default in template expressions. Closes #67.
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204 BUILTINS.update({'Markup': Markup, 'Undefined': Undefined})
382
2682dabbcd04 * Added documentation for the various stream event kinds.
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205 _UNDEF = Undefined(None)
336
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206
357
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207 def _lookup_name(data, name):
336
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208 __traceback_hide__ = True
382
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209 val = data.get(name, _UNDEF)
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210 if val is _UNDEF:
357
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211 val = BUILTINS.get(name, val)
382
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212 if val is _UNDEF:
2682dabbcd04 * Added documentation for the various stream event kinds.
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213 return Undefined(name)
357
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214 return val
336
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215
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216 def _lookup_attr(data, obj, key):
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217 __traceback_hide__ = True
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218 if type(obj) is Undefined:
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219 obj.throw()
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220 if hasattr(obj, key):
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221 return getattr(obj, key)
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222 try:
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223 return obj[key]
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224 except (KeyError, TypeError):
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225 return Undefined(key)
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226
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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227 def _lookup_item(data, obj, key):
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228 __traceback_hide__ = True
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229 if type(obj) is Undefined:
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230 obj.throw()
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231 if len(key) == 1:
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232 key = key[0]
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233 try:
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234 return obj[key]
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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235 except (KeyError, IndexError, TypeError), e:
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236 if isinstance(key, basestring):
382
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diff changeset
237 val = getattr(obj, key, _UNDEF)
2682dabbcd04 * Added documentation for the various stream event kinds.
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diff changeset
238 if val is _UNDEF:
336
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239 val = Undefined(key)
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240 return val
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241 raise
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242
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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243
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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244 class ASTTransformer(object):
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245 """General purpose base class for AST transformations.
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246
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247 Every visitor method can be overridden to return an AST node that has been
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248 altered or replaced in some way.
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249 """
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250 _visitors = {}
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251
357
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diff changeset
252 def visit(self, node):
336
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253 v = self._visitors.get(node.__class__)
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254 if not v:
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255 v = getattr(self, 'visit%s' % node.__class__.__name__)
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256 self._visitors[node.__class__] = v
357
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diff changeset
257 return v(node)
336
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258
357
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
259 def visitExpression(self, node):
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
260 node.node = self.visit(node.node)
336
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261 return node
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262
7763f7aec949 Refactoring: `genshi.template` is now a package, it was getting way to crowded in that file.
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263 # Functions & Accessors
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264
357
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
265 def visitCallFunc(self, node):
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
266 node.node = self.visit(node.node)
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
267 node.args = [self.visit(x) for x in node.args]
336
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268 if node.star_args:
357
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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269 node.star_args = self.visit(node.star_args)
336
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270 if node.dstar_args:
357
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
271 node.dstar_args = self.visit(node.dstar_args)
336
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272 return node
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273
357
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
274 def visitLambda(self, node):
62de137b9322 Improve the way locals (in list comprehensions, lambdas and generator expressions) are handled in template expressions.
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diff changeset
275 node.code = self.visit(node.code)
336
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276 node.filename = '<string>' # workaround for bug in pycodegen
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277 return node
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278
357
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279 def visitGetattr(self, node):
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280 node.expr = self.visit(node.expr)
336
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281 return node
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282
357
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283 def visitSubscript(self, node):
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284 node.expr = self.visit(node.expr)
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285 node.subs = [self.visit(x) for x in node.subs]
336
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286 return node
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287
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288 # Operators
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289
357
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290 def _visitBoolOp(self, node):
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291 node.nodes = [self.visit(x) for x in node.nodes]
336
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292 return node
396
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293 visitAnd = visitOr = visitBitand = visitBitor = visitBitxor = _visitBoolOp
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294 visitAssTuple = _visitBoolOp
336
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295
357
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296 def _visitBinOp(self, node):
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297 node.left = self.visit(node.left)
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298 node.right = self.visit(node.right)
336
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299 return node
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300 visitAdd = visitSub = _visitBinOp
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301 visitDiv = visitFloorDiv = visitMod = visitMul = visitPower = _visitBinOp
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302 visitLeftShift = visitRightShift = _visitBinOp
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303
357
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304 def visitCompare(self, node):
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305 node.expr = self.visit(node.expr)
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306 node.ops = [(op, self.visit(n)) for op, n in node.ops]
336
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307 return node
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308
357
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309 def _visitUnaryOp(self, node):
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310 node.expr = self.visit(node.expr)
336
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311 return node
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312 visitUnaryAdd = visitUnarySub = visitNot = visitInvert = _visitUnaryOp
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313 visitBackquote = _visitUnaryOp
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314
393
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315 def visitIfExp(self, node):
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316 node.test = self.visit(node.test)
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317 node.then = self.visit(node.then)
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318 node.else_ = self.visit(node.else_)
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319 return node
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320
336
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321 # Identifiers, Literals and Comprehensions
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322
357
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323 def _visitDefault(self, node):
336
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324 return node
357
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325 visitAssName = visitConst = visitName = _visitDefault
336
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326
357
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327 def visitDict(self, node):
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328 node.items = [(self.visit(k),
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329 self.visit(v)) for k, v in node.items]
336
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330 return node
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331
357
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332 def visitGenExpr(self, node):
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333 node.code = self.visit(node.code)
336
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334 node.filename = '<string>' # workaround for bug in pycodegen
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335 return node
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336
357
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337 def visitGenExprFor(self, node):
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338 node.assign = self.visit(node.assign)
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339 node.iter = self.visit(node.iter)
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340 node.ifs = [self.visit(x) for x in node.ifs]
336
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341 return node
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342
357
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343 def visitGenExprIf(self, node):
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344 node.test = self.visit(node.test)
336
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345 return node
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346
357
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347 def visitGenExprInner(self, node):
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348 node.quals = [self.visit(x) for x in node.quals]
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349 node.expr = self.visit(node.expr)
336
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350 return node
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351
357
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352 def visitKeyword(self, node):
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353 node.expr = self.visit(node.expr)
336
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354 return node
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355
357
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356 def visitList(self, node):
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357 node.nodes = [self.visit(n) for n in node.nodes]
336
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358 return node
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359
357
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360 def visitListComp(self, node):
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361 node.quals = [self.visit(x) for x in node.quals]
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362 node.expr = self.visit(node.expr)
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363 return node
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364
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365 def visitListCompFor(self, node):
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366 node.assign = self.visit(node.assign)
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367 node.list = self.visit(node.list)
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368 node.ifs = [self.visit(x) for x in node.ifs]
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369 return node
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370
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371 def visitListCompIf(self, node):
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372 node.test = self.visit(node.test)
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373 return node
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374
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375 def visitSlice(self, node):
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376 node.expr = self.visit(node.expr)
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377 if node.lower is not None:
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378 node.lower = self.visit(node.lower)
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379 if node.upper is not None:
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380 node.upper = self.visit(node.upper)
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381 return node
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382
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383 def visitSliceobj(self, node):
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diff changeset
384 node.nodes = [self.visit(x) for x in node.nodes]
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385 return node
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386
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diff changeset
387 def visitTuple(self, node):
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diff changeset
388 node.nodes = [self.visit(n) for n in node.nodes]
336
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389 return node
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parents:
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390
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391
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392 class ExpressionASTTransformer(ASTTransformer):
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393 """Concrete AST transformer that implements the AST transformations needed
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394 for template expressions.
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395 """
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396
357
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diff changeset
397 def __init__(self):
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398 self.locals = []
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399
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diff changeset
400 def visitConst(self, node):
336
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401 if isinstance(node.value, str):
357
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diff changeset
402 try: # If the string is ASCII, return a `str` object
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diff changeset
403 node.value.decode('ascii')
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diff changeset
404 except ValueError: # Otherwise return a `unicode` object
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diff changeset
405 return ast.Const(node.value.decode('utf-8'))
336
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406 return node
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407
357
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diff changeset
408 def visitAssName(self, node):
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diff changeset
409 self.locals[-1].add(node.name)
336
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410 return node
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411
357
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diff changeset
412 def visitGenExpr(self, node):
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diff changeset
413 self.locals.append(set())
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diff changeset
414 node = ASTTransformer.visitGenExpr(self, node)
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diff changeset
415 self.locals.pop()
336
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416 return node
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417
357
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diff changeset
418 def visitGetattr(self, node):
336
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419 return ast.CallFunc(ast.Name('_lookup_attr'), [
357
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420 ast.Name('data'), self.visit(node.expr),
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421 ast.Const(node.attrname)
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422 ])
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423
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424 def visitLambda(self, node):
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425 self.locals.append(set(flatten(node.argnames)))
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426 node = ASTTransformer.visitLambda(self, node)
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427 self.locals.pop()
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428 return node
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429
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430 def visitListComp(self, node):
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431 self.locals.append(set())
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432 node = ASTTransformer.visitListComp(self, node)
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433 self.locals.pop()
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434 return node
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435
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436 def visitName(self, node):
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437 # If the name refers to a local inside a lambda, list comprehension, or
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438 # generator expression, leave it alone
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439 for frame in self.locals:
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440 if node.name in frame:
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441 return node
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442 # Otherwise, translate the name ref into a context lookup
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443 func_args = [ast.Name('data'), ast.Const(node.name)]
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444 return ast.CallFunc(ast.Name('_lookup_name'), func_args)
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445
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446 def visitSubscript(self, node):
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447 return ast.CallFunc(ast.Name('_lookup_item'), [
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448 ast.Name('data'), self.visit(node.expr),
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449 ast.Tuple([self.visit(sub) for sub in node.subs])
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450 ])
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