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annotate markup/eval.py @ 131:2ad83f1d337c trunk

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* Support for line numbers in exceptions in expression evaluation (#22). * Fix bug in expression evaluation when item access was used inside a lambda or list comprehension. Thanks to Kevin Dangoor for reporting the problem.
author cmlenz
date Fri, 04 Aug 2006 13:07:52 +0000
parents c9f0a26e28a2
children dc42cb3c02dc
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."""
1
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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
1
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20
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21 from markup.core import Stream
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22
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23 __all__ = ['Expression']
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24
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25
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26 class Expression(object):
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27 """Evaluates Python expressions used in templates.
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28
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29 >>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
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30 >>> Expression('test').evaluate(data)
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31 'Foo'
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32
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33 >>> Expression('items[0]').evaluate(data)
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34 1
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35 >>> Expression('items[-1]').evaluate(data)
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36 3
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37 >>> Expression('dict["some"]').evaluate(data)
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38 'thing'
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39
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40 Similar to e.g. Javascript, expressions in templates can use the dot
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41 notation for attribute access to access items in mappings:
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42
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43 >>> Expression('dict.some').evaluate(data)
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44 'thing'
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45
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46 This also works the other way around: item access can be used to access
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47 any object attribute (meaning there's no use for `getattr()` in templates):
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48
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49 >>> class MyClass(object):
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50 ... myattr = 'Bar'
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51 >>> data = dict(mine=MyClass(), key='myattr')
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52 >>> Expression('mine.myattr').evaluate(data)
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53 'Bar'
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54 >>> Expression('mine["myattr"]').evaluate(data)
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55 'Bar'
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56 >>> Expression('mine[key]').evaluate(data)
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57 'Bar'
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58
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59 All of the standard Python operators are available to template expressions.
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60 Built-in functions such as `len()` are also available in template
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61 expressions:
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62
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63 >>> data = dict(items=[1, 2, 3])
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64 >>> Expression('len(items)').evaluate(data)
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65 3
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66 """
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67 __slots__ = ['source', 'code']
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68
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69 def __init__(self, source, filename=None, lineno=-1):
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70 """Create the expression.
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71
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72 @param source: the expression as string
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73 """
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74 self.source = source
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75 self.code = _compile(source, filename, lineno)
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76
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77 def __repr__(self):
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78 return '<Expression "%s">' % self.source
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79
120
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80 def evaluate(self, data, nocall=False):
81
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81 """Evaluate the expression against the given data dictionary.
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82
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83 @param data: a mapping containing the data to evaluate against
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84 @param nocall: if true, the result of the evaluation is not called if
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85 if it is a callable
81
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86 @return: the result of the evaluation
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87 """
118
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88 retval = eval(self.code, {'data': data,
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89 '_lookup_name': _lookup_name,
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90 '_lookup_attr': _lookup_attr,
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91 '_lookup_item': _lookup_item})
120
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92 if not nocall and callable(retval):
90
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93 retval = retval()
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94 return retval
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95
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96
116
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97 def _compile(source, filename=None, lineno=-1):
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98 tree = parse(source, 'eval')
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99 xform = ExpressionASTTransformer()
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100 tree = xform.visit(tree)
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101
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102 if isinstance(filename, unicode):
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103 # unicode file names not allowed for code objects
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104 filename = filename.encode('utf-8', 'replace')
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105 elif not filename:
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106 filename = '<string>'
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107 tree.filename = '<string>'
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108 if lineno <= 0:
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109 lineno = 1
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110
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111 gen = ExpressionCodeGenerator(tree)
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112 gen.optimized = True
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113 code = gen.getCode()
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114
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115 # We'd like to just set co_firstlineno, but it's readonly. So we need to
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116 # clone the code object while adjusting the line number
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117 return new.code(0, code.co_nlocals, code.co_stacksize,
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118 code.co_flags | 0x0040, code.co_code, code.co_consts,
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119 code.co_names, code.co_varnames, filename, code.co_name,
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120 lineno, code.co_lnotab, (), ())
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121
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122 def _lookup_name(data, name, locals=None):
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123 val = data.get(name)
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124 if val is None and locals:
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125 val = locals.get(name)
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126 if val is None:
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127 val = getattr(__builtin__, name, None)
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128 return val
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129
118
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130 def _lookup_attr(data, obj, key):
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131 if hasattr(obj, key):
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132 return getattr(obj, key)
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133 try:
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134 return obj[key]
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135 except (KeyError, TypeError):
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136 return None
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137
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138 def _lookup_item(data, obj, key):
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139 if len(key) == 1:
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140 key = key[0]
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141 try:
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142 return obj[key]
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143 except (KeyError, IndexError, TypeError), e:
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144 pass
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145 if isinstance(key, basestring):
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146 try:
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147 return getattr(obj, key)
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148 except (AttributeError, TypeError), e:
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149 pass
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150
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151 class ASTTransformer(object):
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152 """General purpose base class for AST transformations.
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153
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154 Every visitor method can be overridden to return an AST node that has been
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155 altered or replaced in some way.
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156 """
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157 _visitors = {}
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158
88
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159 def visit(self, node, *args, **kwargs):
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160 v = self._visitors.get(node.__class__)
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161 if not v:
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162 v = getattr(self, 'visit%s' % node.__class__.__name__)
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163 self._visitors[node.__class__] = v
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164 return v(node, *args, **kwargs)
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165
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166 def visitExpression(self, node, *args, **kwargs):
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167 node.node = self.visit(node.node, *args, **kwargs)
87
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168 return node
1b874f032bde 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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169
1b874f032bde 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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170 # Functions & Accessors
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171
88
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172 def visitCallFunc(self, node, *args, **kwargs):
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173 node.node = self.visit(node.node, *args, **kwargs)
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174 node.args = map(lambda x: self.visit(x, *args, **kwargs), node.args)
87
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175 if node.star_args:
88
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176 node.star_args = map(lambda x: self.visit(x, *args, **kwargs),
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diff changeset
177 node.star_args)
87
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178 if node.dstar_args:
88
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179 node.dstart_args = map(lambda x: self.visit(x, *args, **kwargs),
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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180 node.dstar_args)
87
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181 return node
30
bcdbb7e5e4e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
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182
118
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183 def visitLambda(self, node, *args, **kwargs):
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184 node.code = self.visit(node.code, *args, **kwargs)
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185 node.filename = '<string>' # workaround for bug in pycodegen
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186 return node
c392d38694d9 Add basic support for using `lambda`s in expressions. Closes #21. (Not sure about default arguments, need a test case).
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187
88
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188 def visitGetattr(self, node, *args, **kwargs):
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189 node.expr = self.visit(node.expr, *args, **kwargs)
87
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190 return node
30
bcdbb7e5e4e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
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191
88
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192 def visitSubscript(self, node, *args, **kwargs):
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193 node.expr = self.visit(node.expr, *args, **kwargs)
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194 node.subs = map(lambda x: self.visit(x, *args, **kwargs), node.subs)
87
1b874f032bde 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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195 return node
30
bcdbb7e5e4e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
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196
87
1b874f032bde 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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197 # Operators
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198
88
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199 def _visitBoolOp(self, node, *args, **kwargs):
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200 node.nodes = map(lambda x: self.visit(x, *args, **kwargs), node.nodes)
87
1b874f032bde 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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201 return node
1b874f032bde 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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202 visitAnd = visitOr = visitBitand = visitBitor = _visitBoolOp
1b874f032bde 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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203
88
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204 def _visitBinOp(self, node, *args, **kwargs):
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205 node.left = self.visit(node.left, *args, **kwargs)
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206 node.right = self.visit(node.right, *args, **kwargs)
87
1b874f032bde 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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207 return node
1b874f032bde 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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208 visitAdd = visitSub = _visitBinOp
1b874f032bde 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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209 visitDiv = visitFloorDiv = visitMod = visitMul = visitPower = _visitBinOp
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210 visitLeftShift = visitRightShift = _visitBinOp
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211
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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212 def visitCompare(self, node, *args, **kwargs):
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213 node.expr = self.visit(node.expr, *args, **kwargs)
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214 node.ops = map(lambda (op, n): (op, self.visit(n, *args, **kwargs)),
87
1b874f032bde 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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215 node.ops)
1b874f032bde 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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216 return node
1b874f032bde 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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217
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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218 def _visitUnaryOp(self, node, *args, **kwargs):
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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219 node.expr = self.visit(node.expr, *args, **kwargs)
87
1b874f032bde 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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220 return node
1b874f032bde 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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221 visitUnaryAdd = visitUnarySub = visitNot = visitInvert = _visitUnaryOp
98
44af12832c5a Bugfix in `builder` module: attribute values need to be converted to strings when generating streams.
cmlenz
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222 visitBackquote = _visitUnaryOp
87
1b874f032bde 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
223
88
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224 # Identifiers, Literals and Comprehensions
87
1b874f032bde 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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225
88
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226 def _visitDefault(self, node, *args, **kwargs):
87
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227 return node
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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228 visitAssName = visitAssTuple = _visitDefault
102
e20a153cc20c Ported [118] to trunk
jonas
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229 visitConst = visitName = _visitDefault
e20a153cc20c Ported [118] to trunk
jonas
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diff changeset
230
e20a153cc20c Ported [118] to trunk
jonas
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diff changeset
231 def visitKeyword(self, node, *args, **kwargs):
e20a153cc20c Ported [118] to trunk
jonas
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diff changeset
232 node.expr = self.visit(node.expr, *args, **kwargs)
e20a153cc20c Ported [118] to trunk
jonas
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diff changeset
233 return node
87
1b874f032bde 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
234
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
235 def visitDict(self, node, *args, **kwargs):
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236 node.items = map(lambda (k, v): (self.visit(k, *args, **kwargs),
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
237 self.visit(v, *args, **kwargs)),
87
1b874f032bde 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
238 node.items)
1b874f032bde 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
239 return node
1b874f032bde 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
240
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
241 def visitTuple(self, node, *args, **kwargs):
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
242 node.nodes = map(lambda n: self.visit(n, *args, **kwargs), node.nodes)
87
1b874f032bde 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
243 return node
1b874f032bde 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
244
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
245 def visitList(self, node, *args, **kwargs):
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diff changeset
246 node.nodes = map(lambda n: self.visit(n, *args, **kwargs), node.nodes)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
247 return node
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
248
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
249 def visitListComp(self, node, *args, **kwargs):
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
250 node.expr = self.visit(node.expr, *args, **kwargs)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
251 node.quals = map(lambda x: self.visit(x, *args, **kwargs), node.quals)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
252 return node
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
253
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
254 def visitListCompFor(self, node, *args, **kwargs):
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
255 node.assign = self.visit(node.assign, *args, **kwargs)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
256 node.list = self.visit(node.list, *args, **kwargs)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
257 node.ifs = map(lambda x: self.visit(x, *args, **kwargs), node.ifs)
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
258 return node
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
259
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
260 def visitListCompIf(self, node, *args, **kwargs):
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
261 node.test = self.visit(node.test, *args, **kwargs)
87
1b874f032bde 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
262 return node
1b874f032bde 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
263
1b874f032bde 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
264
1b874f032bde 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
265 class ExpressionASTTransformer(ASTTransformer):
112
5f9af749341c Docstring typo fix.
cmlenz
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diff changeset
266 """Concrete AST transformer that implements the AST transformations needed
5f9af749341c Docstring typo fix.
cmlenz
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diff changeset
267 for template expressions.
87
1b874f032bde 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
268 """
1b874f032bde 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
269
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
270 def visitGetattr(self, node, locals_=False):
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
271 return ast.CallFunc(ast.Name('_lookup_attr'), [
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
272 ast.Name('data'), self.visit(node.expr, locals_=locals_),
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
273 ast.Const(node.attrname)
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
274 ])
30
bcdbb7e5e4e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
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diff changeset
275
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
276 def visitLambda(self, node, locals_=False):
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
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diff changeset
277 node.code = self.visit(node.code, locals_=True)
118
c392d38694d9 Add basic support for using `lambda`s in expressions. Closes #21. (Not sure about default arguments, need a test case).
cmlenz
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diff changeset
278 node.filename = '<string>' # workaround for bug in pycodegen
c392d38694d9 Add basic support for using `lambda`s in expressions. Closes #21. (Not sure about default arguments, need a test case).
cmlenz
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diff changeset
279 return node
c392d38694d9 Add basic support for using `lambda`s in expressions. Closes #21. (Not sure about default arguments, need a test case).
cmlenz
parents: 116
diff changeset
280
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
281 def visitListComp(self, node, locals_=False):
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
282 node.expr = self.visit(node.expr, locals_=True)
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
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diff changeset
283 node.quals = map(lambda x: self.visit(x, locals_=True), node.quals)
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
cmlenz
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diff changeset
284 return node
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
285
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
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diff changeset
286 def visitName(self, node, locals_=False):
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
287 func_args = [ast.Name('data'), ast.Const(node.name)]
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
288 if locals_:
88
628ba9ed39ef Add support for list comprehension in expressions (see #12).
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diff changeset
289 func_args.append(ast.CallFunc(ast.Name('locals'), []))
116
c77c113846d6 Merged [135:138/branches/experimental/cspeedups].
cmlenz
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diff changeset
290 return ast.CallFunc(ast.Name('_lookup_name'), func_args)
81
d60486018004 Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
291
131
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
292 def visitSubscript(self, node, locals_=False):
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
293 return ast.CallFunc(ast.Name('_lookup_item'), [
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
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diff changeset
294 ast.Name('data'), self.visit(node.expr, locals_=locals_),
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
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diff changeset
295 ast.Tuple(map(lambda x: self.visit(x, locals_=locals_), node.subs))
2ad83f1d337c * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
296 ])
Copyright (C) 2012-2017 Edgewall Software