Mercurial > genshi > genshi-test

annotate markup/eval.py @ 87:c6f07b7cd3ea

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Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
author cmlenz
date Mon, 17 Jul 2006 15:08:53 +0000
parents 5d98c4259d68
children 9ecae580dd93
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://markup.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://markup.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__
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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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
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20 from markup.core import Stream
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21
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22 __all__ = ['Expression']
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23
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24
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25 class Expression(object):
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26 """Evaluates Python expressions used in templates.
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27
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28 >>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
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29 >>> Expression('test').evaluate(data)
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30 'Foo'
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cc034182061e Template expressions are now compiled to Python bytecode.
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31
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32 >>> Expression('items[0]').evaluate(data)
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33 1
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34 >>> Expression('items[-1]').evaluate(data)
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35 3
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36 >>> Expression('dict["some"]').evaluate(data)
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37 'thing'
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38
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39 Similar to e.g. Javascript, expressions in templates can use the dot
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40 notation for attribute access to access items in mappings:
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41
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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 This also works the other way around: item access can be used to access
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46 any object attribute (meaning there's no use for `getattr()` in templates):
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47
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48 >>> class MyClass(object):
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49 ... myattr = 'Bar'
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50 >>> data = dict(mine=MyClass(), key='myattr')
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51 >>> Expression('mine.myattr').evaluate(data)
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52 'Bar'
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53 >>> Expression('mine["myattr"]').evaluate(data)
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54 'Bar'
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55 >>> Expression('mine[key]').evaluate(data)
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56 'Bar'
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57
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58 All of the standard Python operators are available to template expressions.
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59 Built-in functions such as `len()` are also available in template
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60 expressions:
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61
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62 >>> data = dict(items=[1, 2, 3])
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63 >>> Expression('len(items)').evaluate(data)
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64 3
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65 """
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66 __slots__ = ['source', 'code']
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67
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68 def __init__(self, source, filename=None, lineno=-1):
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69 """Create the expression.
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70
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71 @param source: the expression as string
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72 """
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73 self.source = source
87
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74 self.code = self._compile(source, filename, lineno)
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75
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76 def __repr__(self):
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77 return '<Expression "%s">' % self.source
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78
81
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79 def evaluate(self, data):
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80 """Evaluate the expression against the given data dictionary.
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81
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82 @param data: a mapping containing the data to evaluate against
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83 @return: the result of the evaluation
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84 """
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85 return eval(self.code)
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2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
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86
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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87 def _compile(self, source, filename, lineno):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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88 tree = parse(self.source, 'eval')
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89 xform = ExpressionASTTransformer()
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90 tree = xform.visit(tree)
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91
87
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92 if isinstance(filename, unicode):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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93 # pycodegen doesn't like unicode in the filename
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94 filename = filename.encode('utf-8', 'replace')
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95 tree.filename = filename or '<string>'
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96
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97 gen = ExpressionCodeGenerator(tree)
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98 if lineno >= 0:
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99 gen.emit('SET_LINENO', lineno)
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100
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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101 return gen.getCode()
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102
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103 def _lookup_name(self, data, name):
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104 val = data.get(name)
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105 if val is None:
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106 val = getattr(__builtin__, name, None)
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107 return val
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108
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109 def _lookup_attribute(self, data, obj, key):
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110 if hasattr(obj, key):
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111 return getattr(obj, key)
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112 try:
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113 return obj[key]
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114 except (KeyError, TypeError):
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115 return None
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116
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117 def _lookup_item(self, data, obj, key):
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118 if len(key) == 1:
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119 key = key[0]
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120 try:
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121 return obj[key]
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122 except (KeyError, IndexError, TypeError), e:
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123 pass
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124 if isinstance(key, basestring):
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125 try:
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126 return getattr(obj, key)
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127 except (AttributeError, TypeError), e:
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128 pass
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129
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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130
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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131 class ASTTransformer(object):
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132 """General purpose base class for AST transformations.
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133
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134 Every visitor method can be overridden to return an AST node that has been
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135 altered or replaced in some way.
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136 """
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137 _visitors = {}
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138
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139 def visit(self, node):
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140 v = self._visitors.get(node.__class__)
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141 if not v:
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142 v = getattr(self, 'visit%s' % node.__class__.__name__)
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143 self._visitors[node.__class__] = v
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144 return v(node)
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145
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146 def visitExpression(self, node):
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147 node.node = self.visit(node.node)
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148 return node
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149
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150 # Functions & Accessors
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151
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152 def visitCallFunc(self, node):
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153 node.node = self.visit(node.node)
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154 node.args = map(self.visit, node.args)
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155 if node.star_args:
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156 node.star_args = map(self.visit, node.star_args)
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157 if node.dstar_args:
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
158 node.dstart_args = map(self.visit, node.dstar_args)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
159 return node
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
160
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
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diff changeset
161 def visitGetattr(self, node):
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
162 node.expr = self.visit(node.expr)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
163 return node
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
164
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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165 def visitSubscript(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
166 node.expr = self.visit(node.expr)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
167 node.subs = map(self.visit, node.subs)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
168 return node
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
169
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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170 # Operators
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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171
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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172 def _visitBoolOp(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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173 node.nodes = map(self.visit, node.nodes)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
174 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
175 visitAnd = visitOr = visitBitand = visitBitor = _visitBoolOp
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
176
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
177 def _visitBinOp(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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178 node.left = self.visit(node.left)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
179 node.right = self.visit(node.right)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
180 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
181 visitAdd = visitSub = _visitBinOp
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
182 visitDiv = visitFloorDiv = visitMod = visitMul = visitPower = _visitBinOp
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
183 visitLeftShift = visitRightShift = _visitBinOp
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
184
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
185 def visitCompare(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
186 node.expr = self.visit(node.expr)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
187 node.ops = map(lambda (op, expr): (op, self.visit(expr)),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
188 node.ops)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
189 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
190
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
191 def _visitUnaryOp(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
192 node.expr = self.visit(node.expr)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
193 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
194 visitUnaryAdd = visitUnarySub = visitNot = visitInvert = _visitUnaryOp
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
195
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
196 # Identifiers & Literals
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
197
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
198 def _visitDefault(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
199 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
200 visitConst = visitKeyword = visitName = _visitDefault
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
201
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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diff changeset
202 def visitDict(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
203 node.items = map(lambda (k, v): (self.visit(k), self.visit(v)),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
204 node.items)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
205 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
206
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
207 def visitTuple(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
208 node.nodes = map(lambda n: self.visit(n), node.nodes)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
209 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
210
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
211 def visitList(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
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parents: 86
diff changeset
212 node.nodes = map(lambda n: self.visit(n), node.nodes)
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
213 return node
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
214
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
215
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
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diff changeset
216 class ExpressionASTTransformer(ASTTransformer):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
217 """Concrete AST transformer that implementations the AST transformations
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
218 needed for template expressions.
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
219 """
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
220
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
221 def visitGetattr(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
222 return ast.CallFunc(
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
223 ast.Getattr(ast.Name('self'), '_lookup_attribute'),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
224 [ast.Name('data'), self.visit(node.expr), ast.Const(node.attrname)]
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
225 )
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
226
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
227 def visitName(self, node):
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
228 return ast.CallFunc(
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
229 ast.Getattr(ast.Name('self'), '_lookup_name'),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
230 [ast.Name('data'), ast.Const(node.name)]
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
231 )
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
232 return node
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
233
87
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
234 def visitSubscript(self, node):
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
235 return ast.CallFunc(
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
236 ast.Getattr(ast.Name('self'), '_lookup_item'),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
237 [ast.Name('data'), self.visit(node.expr),
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
238 ast.Tuple(map(self.visit, node.subs))]
c6f07b7cd3ea Fix some problems in expression evaluation by transforming the AST and compiling that to bytecode, instead of generating bytecode directly. Invalidates #13.
cmlenz
parents: 86
diff changeset
239 )
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