Mercurial > genshi > genshi-test

annotate markup/eval.py @ 90:242610137d1f

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
When an expression evaluates to a callable, it is called implicitly.
author cmlenz
date Wed, 19 Jul 2006 17:50:17 +0000
parents 9ecae580dd93
children bc73d3ab823f
rev   line source
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
1 # -*- coding: utf-8 -*-
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
2 #
66
822089ae65ce Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents: 42
diff changeset
3 # Copyright (C) 2006 Edgewall Software
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
4 # All rights reserved.
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
5 #
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
6 # This software is licensed as described in the file COPYING, which
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
7 # you should have received as part of this distribution. The terms
66
822089ae65ce Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents: 42
diff changeset
8 # are also available at http://markup.edgewall.org/wiki/License.
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
9 #
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
10 # This software consists of voluntary contributions made by many
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
11 # individuals. For the exact contribution history, see the revision
66
822089ae65ce Switch copyright to Edgewall and URLs to markup.edgewall.org.
cmlenz
parents: 42
diff changeset
12 # history and logs, available at http://markup.edgewall.org/log/.
27
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
13
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
14 """Support for "safe" evaluation of Python expressions."""
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
15
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
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.
cmlenz
parents: 86
diff changeset
17 from compiler import ast, parse
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
18 from compiler.pycodegen import ExpressionCodeGenerator
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
19
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
20 from markup.core import Stream
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
21
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
22 __all__ = ['Expression']
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
23
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
24
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
25 class Expression(object):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
26 """Evaluates Python expressions used in templates.
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
27
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
28 >>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
29 >>> Expression('test').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
30 'Foo'
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
31
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
32 >>> Expression('items[0]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
33 1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
34 >>> Expression('items[-1]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
35 3
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
36 >>> Expression('dict["some"]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
37 'thing'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
38
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
39 Similar to e.g. Javascript, expressions in templates can use the dot
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
40 notation for attribute access to access items in mappings:
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
41
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
42 >>> Expression('dict.some').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
43 'thing'
86
5d98c4259d68 Accidentially left some doctests disabled.
cmlenz
parents: 82
diff changeset
44
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
45 This also works the other way around: item access can be used to access
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
46 any object attribute (meaning there's no use for `getattr()` in templates):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
47
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
48 >>> class MyClass(object):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
49 ... myattr = 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
50 >>> data = dict(mine=MyClass(), key='myattr')
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
51 >>> Expression('mine.myattr').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
52 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
53 >>> Expression('mine["myattr"]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
54 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
55 >>> Expression('mine[key]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
56 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
57
31
9a958398bed9 * More test cases for expression evaluation.
cmlenz
parents: 30
diff changeset
58 All of the standard Python operators are available to template expressions.
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
59 Built-in functions such as `len()` are also available in template
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
60 expressions:
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
61
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
62 >>> data = dict(items=[1, 2, 3])
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
63 >>> Expression('len(items)').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
64 3
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
65 """
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
66 __slots__ = ['source', 'code']
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
67
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
68 def __init__(self, source, filename=None, lineno=-1):
27
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
69 """Create the expression.
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
70
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
71 @param source: the expression as string
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
72 """
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
73 self.source = source
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
74 self.code = self._compile(source, filename, lineno)
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
75
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
76 def __repr__(self):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
77 return '<Expression "%s">' % self.source
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
78
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
79 def evaluate(self, data):
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
80 """Evaluate the expression against the given data dictionary.
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
82 @param data: a mapping containing the data to evaluate against
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
83 @return: the result of the evaluation
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
84 """
90
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
85 retval = eval(self.code)
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
86 if callable(retval):
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
87 retval = retval()
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
88 return retval
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
89
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
90 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.
cmlenz
parents: 86
diff changeset
91 tree = parse(self.source, 'eval')
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
92 xform = ExpressionASTTransformer()
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
93 tree = xform.visit(tree)
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
94
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
95 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.
cmlenz
parents: 86
diff changeset
96 # pycodegen doesn't like unicode in the filename
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
97 filename = filename.encode('utf-8', 'replace')
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
98 tree.filename = filename or '<string>'
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
99
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
100 gen = ExpressionCodeGenerator(tree)
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
101 if lineno >= 0:
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
102 gen.emit('SET_LINENO', lineno)
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
103
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
104 return gen.getCode()
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
105
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
106 def _lookup_name(self, data, name, locals=None):
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
107 val = data.get(name)
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
108 if val is None and locals:
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
109 val = locals.get(name)
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
110 if val is None:
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
111 val = getattr(__builtin__, name, None)
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
112 return val
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
113
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
114 def _lookup_attribute(self, data, obj, key):
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
115 if hasattr(obj, key):
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
116 return getattr(obj, key)
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
117 try:
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
118 return obj[key]
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
119 except (KeyError, TypeError):
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
120 return None
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
121
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
122 def _lookup_item(self, data, obj, key):
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
123 if len(key) == 1:
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
124 key = key[0]
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
125 try:
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
126 return obj[key]
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
127 except (KeyError, IndexError, TypeError), e:
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
128 pass
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
129 if isinstance(key, basestring):
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
130 try:
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
131 return getattr(obj, key)
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
132 except (AttributeError, TypeError), e:
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
133 pass
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
134
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
135
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
136 class ASTTransformer(object):
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
137 """General purpose base class for 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
138
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
139 Every visitor method can be overridden to return an AST node that has been
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
140 altered or replaced in some way.
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
141 """
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
142 _visitors = {}
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
143
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
144 def visit(self, node, *args, **kwargs):
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
145 v = self._visitors.get(node.__class__)
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
146 if not 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
147 v = getattr(self, 'visit%s' % node.__class__.__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
148 self._visitors[node.__class__] = v
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
149 return v(node, *args, **kwargs)
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
150
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
151 def visitExpression(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
152 node.node = self.visit(node.node, *args, **kwargs)
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
153 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
154
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
155 # Functions & Accessors
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
156
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
157 def visitCallFunc(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
158 node.node = self.visit(node.node, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
159 node.args = map(lambda x: self.visit(x, *args, **kwargs), node.args)
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
160 if node.star_args:
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
161 node.star_args = map(lambda x: self.visit(x, *args, **kwargs),
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
162 node.star_args)
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
163 if node.dstar_args:
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
164 node.dstart_args = map(lambda x: self.visit(x, *args, **kwargs),
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
165 node.dstar_args)
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
166 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
167
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
168 def visitGetattr(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
169 node.expr = self.visit(node.expr, *args, **kwargs)
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
170 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
171
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
172 def visitSubscript(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
173 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
174 node.subs = map(lambda x: self.visit(x, *args, **kwargs), node.subs)
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
175 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
176
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
177 # Operators
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
178
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
179 def _visitBoolOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
180 node.nodes = map(lambda x: self.visit(x, *args, **kwargs), node.nodes)
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
181 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
182 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
parents: 86
diff changeset
183
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
184 def _visitBinOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
185 node.left = self.visit(node.left, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
186 node.right = self.visit(node.right, *args, **kwargs)
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
187 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
188 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.
cmlenz
parents: 86
diff changeset
189 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.
cmlenz
parents: 86
diff changeset
190 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.
cmlenz
parents: 86
diff changeset
191
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
192 def visitCompare(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
193 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
194 node.ops = map(lambda (op, n): (op, self.visit(n, *args, **kwargs)),
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
195 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
196 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
197
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
198 def _visitUnaryOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
199 node.expr = self.visit(node.expr, *args, **kwargs)
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
200 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
201 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.
cmlenz
parents: 86
diff changeset
202
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
203 # Identifiers, Literals and Comprehensions
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
204
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
205 def _visitDefault(self, node, *args, **kwargs):
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
206 return node
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
207 visitAssName = visitAssTuple = _visitDefault
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
208 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.
cmlenz
parents: 86
diff changeset
209
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
210 def visitDict(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
211 node.items = map(lambda (k, v): (self.visit(k, *args, **kwargs),
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
212 self.visit(v, *args, **kwargs)),
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
213 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
214 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
215
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
216 def visitTuple(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
217 node.nodes = map(lambda n: self.visit(n, *args, **kwargs), node.nodes)
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
218 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
219
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
220 def visitList(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
221 node.nodes = map(lambda n: self.visit(n, *args, **kwargs), node.nodes)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
222 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
223
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
224 def visitListComp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
225 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
226 node.quals = map(lambda x: self.visit(x, *args, **kwargs), node.quals)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
227 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
228
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
229 def visitListCompFor(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
230 node.assign = self.visit(node.assign, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
231 node.list = self.visit(node.list, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
232 node.ifs = map(lambda x: self.visit(x, *args, **kwargs), node.ifs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
233 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
234
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
235 def visitListCompIf(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
236 node.test = self.visit(node.test, *args, **kwargs)
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
237 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
238
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
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
240 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
241 """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
242 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
243 """
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
244
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
245 def visitGetattr(self, node, *args, **kwargs):
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
246 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
247 ast.Getattr(ast.Name('self'), '_lookup_attribute'),
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
248 [ast.Name('data'), self.visit(node.expr, *args, **kwargs),
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
249 ast.Const(node.attrname)]
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
250 )
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
251
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
252 def visitListComp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
253 old_lookup_locals = kwargs.get('lookup_locals', False)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
254 kwargs['lookup_locals'] = True
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
255 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
256 node.quals = map(lambda x: self.visit(x, *args, **kwargs), node.quals)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
257 kwargs['lookup_locals'] = old_lookup_locals
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
258 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
259
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
260 def visitName(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
261 func_args = [ast.Name('data'), ast.Const(node.name)]
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
262 if kwargs.get('lookup_locals'):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
263 func_args.append(ast.CallFunc(ast.Name('locals'), []))
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
264 return ast.CallFunc(
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
265 ast.Getattr(ast.Name('self'), '_lookup_name'), func_args
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
266 )
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
267 return node
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
268
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
269 def visitSubscript(self, node, *args, **kwargs):
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
270 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
271 ast.Getattr(ast.Name('self'), '_lookup_item'),
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
272 [ast.Name('data'), self.visit(node.expr, *args, **kwargs),
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
273 ast.Tuple(map(self.visit, node.subs, *args, **kwargs))]
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
274 )
Copyright (C) 2012-2017 Edgewall Software