Mercurial > genshi > genshi-test

annotate markup/eval.py @ 160:faea6db52ef1

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Attribute order in parsed XML is now preserved.
author cmlenz
date Wed, 16 Aug 2006 21:54:49 +0000
parents 56d534eb53f9
children 4ed68a904235
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
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
19 import new
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
20
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
21 __all__ = ['Expression']
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
22
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
23
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
24 class Expression(object):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
25 """Evaluates Python expressions used in templates.
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
26
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
27 >>> data = dict(test='Foo', items=[1, 2, 3], dict={'some': 'thing'})
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
28 >>> Expression('test').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
29 'Foo'
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
30
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
31 >>> Expression('items[0]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
32 1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
33 >>> Expression('items[-1]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
34 3
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
35 >>> Expression('dict["some"]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
36 'thing'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
37
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
38 Similar to e.g. Javascript, expressions in templates can use the dot
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
39 notation for attribute access to access items in mappings:
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
40
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
41 >>> Expression('dict.some').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
42 'thing'
86
5d98c4259d68 Accidentially left some doctests disabled.
cmlenz
parents: 82
diff changeset
43
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
44 This also works the other way around: item access can be used to access
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
45 any object attribute (meaning there's no use for `getattr()` in templates):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
46
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
47 >>> class MyClass(object):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
48 ... myattr = 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
49 >>> data = dict(mine=MyClass(), key='myattr')
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
50 >>> Expression('mine.myattr').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
51 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
52 >>> Expression('mine["myattr"]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
53 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
54 >>> Expression('mine[key]').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
55 'Bar'
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
56
31
9a958398bed9 * More test cases for expression evaluation.
cmlenz
parents: 30
diff changeset
57 All of the standard Python operators are available to template expressions.
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
58 Built-in functions such as `len()` are also available in template
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
59 expressions:
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
60
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
61 >>> data = dict(items=[1, 2, 3])
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
62 >>> Expression('len(items)').evaluate(data)
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
63 3
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
64 """
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
65 __slots__ = ['source', 'code']
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
66
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
67 def __init__(self, source, filename=None, lineno=-1):
27
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
68 """Create the expression.
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
69
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
70 @param source: the expression as string
b8456279c444 * Fix the boilerplate in the Python source files.
cmlenz
parents: 16
diff changeset
71 """
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
72 self.source = source
134
df44110ca91d * Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents: 133
diff changeset
73 self.code = _compile(self, filename, lineno)
1
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
74
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
75 def __repr__(self):
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
76 return '<Expression "%s">' % self.source
821114ec4f69 Initial import.
cmlenz
parents:
diff changeset
77
120
eb6cead67474 * Allow `py:with` directives to define `lambda`s
cmlenz
parents: 118
diff changeset
78 def evaluate(self, data, nocall=False):
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
79 """Evaluate the expression against the given data dictionary.
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
80
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
81 @param data: a mapping containing the data to evaluate against
120
eb6cead67474 * Allow `py:with` directives to define `lambda`s
cmlenz
parents: 118
diff changeset
82 @param nocall: if true, the result of the evaluation is not called if
eb6cead67474 * Allow `py:with` directives to define `lambda`s
cmlenz
parents: 118
diff changeset
83 if it is a callable
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
84 @return: the result of the evaluation
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
85 """
118
226613431921 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
86 retval = eval(self.code, {'data': data,
226613431921 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
87 '_lookup_name': _lookup_name,
226613431921 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
88 '_lookup_attr': _lookup_attr,
226613431921 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
89 '_lookup_item': _lookup_item})
120
eb6cead67474 * Allow `py:with` directives to define `lambda`s
cmlenz
parents: 118
diff changeset
90 if not nocall and callable(retval):
90
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
91 retval = retval()
242610137d1f When an expression evaluates to a callable, it is called implicitly.
cmlenz
parents: 88
diff changeset
92 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
93
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
94
134
df44110ca91d * Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents: 133
diff changeset
95 def _compile(expr, filename=None, lineno=-1):
138
d91e1e822969 Add some more assertions to the XPath tests.
cmlenz
parents: 134
diff changeset
96 tree = ExpressionASTTransformer().visit(parse(expr.source, 'eval'))
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
97 if isinstance(filename, unicode):
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
98 # unicode file names not allowed for code objects
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
99 filename = filename.encode('utf-8', 'replace')
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
100 elif not filename:
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
101 filename = '<string>'
132
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
102 tree.filename = filename
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
103 if lineno <= 0:
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
104 lineno = 1
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
105
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
106 gen = ExpressionCodeGenerator(tree)
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
107 gen.optimized = True
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
108 code = gen.getCode()
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
109
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
110 # We'd like to just set co_firstlineno, but it's readonly. So we need to
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
111 # clone the code object while adjusting the line number
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
112 return new.code(0, code.co_nlocals, code.co_stacksize,
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
113 code.co_flags | 0x0040, code.co_code, code.co_consts,
134
df44110ca91d * Improve the accuracy of line numbers for text nodes, so that reported errors about syntax or evaluation errors in expressions point to the right line (not quite perfect yet, though).
cmlenz
parents: 133
diff changeset
114 code.co_names, code.co_varnames, filename, repr(expr),
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
115 lineno, code.co_lnotab, (), ())
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
116
132
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
117 def _lookup_name(data, name, locals_=None):
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
118 val = None
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
119 if locals_:
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
120 val = locals_.get(name)
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
121 if val is None:
0288dedce3d2 Name lookup in expressions: try locals first, then the context.
cmlenz
parents: 131
diff changeset
122 val = data.get(name)
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
123 if val is None:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
124 val = getattr(__builtin__, name, None)
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
125 return val
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
126
118
226613431921 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
127 def _lookup_attr(data, obj, key):
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
128 if hasattr(obj, key):
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
129 return getattr(obj, key)
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
130 try:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
131 return obj[key]
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
132 except (KeyError, TypeError):
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
133 return None
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
134
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
135 def _lookup_item(data, obj, key):
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
136 if len(key) == 1:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
137 key = key[0]
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
138 try:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
139 return obj[key]
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
140 except (KeyError, IndexError, TypeError), e:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
141 if isinstance(key, basestring):
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
142 try:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
143 return getattr(obj, key)
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
144 except (AttributeError, TypeError), e:
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
145 pass
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
146
138
d91e1e822969 Add some more assertions to the XPath tests.
cmlenz
parents: 134
diff changeset
147
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
148 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
149 """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
150
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
151 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
152 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
153 """
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 _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
155
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
156 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
157 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
158 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
159 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
160 self._visitors[node.__class__] = v
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
161 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
162
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
163 def visitExpression(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
164 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
165 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
166
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
167 # 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
168
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
169 def visitCallFunc(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
170 node.node = self.visit(node.node, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
171 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
172 if node.star_args:
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
173 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
174 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
175 if node.dstar_args:
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
176 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
177 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
178 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
179
118
226613431921 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
180 def visitLambda(self, node, *args, **kwargs):
226613431921 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
181 node.code = self.visit(node.code, *args, **kwargs)
226613431921 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
182 node.filename = '<string>' # workaround for bug in pycodegen
226613431921 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
183 return node
226613431921 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
184
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
185 def visitGetattr(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
186 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
187 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
188
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
189 def visitSubscript(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
190 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
191 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
192 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
193
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
194 # 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
195
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
196 def _visitBoolOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
197 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
198 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
199 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
200
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
201 def _visitBinOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
202 node.left = self.visit(node.left, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
203 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
204 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
205 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
206 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
207 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
208
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
209 def visitCompare(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
210 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
211 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
212 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
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
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
215 def _visitUnaryOp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
216 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
217 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
218 visitUnaryAdd = visitUnarySub = visitNot = visitInvert = _visitUnaryOp
98
bc73d3ab823f Bugfix in `builder` module: attribute values need to be converted to strings when generating streams.
cmlenz
parents: 90
diff changeset
219 visitBackquote = _visitUnaryOp
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
220
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
221 # 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
222
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
223 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
224 return node
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
225 visitAssName = visitAssTuple = _visitDefault
102
12efdfe8af47 Ported [118] to trunk
jonas
parents: 101
diff changeset
226 visitConst = visitName = _visitDefault
12efdfe8af47 Ported [118] to trunk
jonas
parents: 101
diff changeset
227
12efdfe8af47 Ported [118] to trunk
jonas
parents: 101
diff changeset
228 def visitKeyword(self, node, *args, **kwargs):
12efdfe8af47 Ported [118] to trunk
jonas
parents: 101
diff changeset
229 node.expr = self.visit(node.expr, *args, **kwargs)
12efdfe8af47 Ported [118] to trunk
jonas
parents: 101
diff changeset
230 return 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
231
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
232 def visitDict(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
233 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
234 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
235 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
236 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
237
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
238 def visitTuple(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
239 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
240 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
241
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
242 def visitList(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
243 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
244 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
245
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
246 def visitListComp(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
247 node.expr = self.visit(node.expr, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
248 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
249 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
250
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
251 def visitListCompFor(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
252 node.assign = self.visit(node.assign, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
253 node.list = self.visit(node.list, *args, **kwargs)
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
254 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
255 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
256
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
257 def visitListCompIf(self, node, *args, **kwargs):
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
258 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
259 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
260
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
261
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
262 class ExpressionASTTransformer(ASTTransformer):
112
a834a6669681 Docstring typo fix.
cmlenz
parents: 102
diff changeset
263 """Concrete AST transformer that implements the AST transformations needed
a834a6669681 Docstring typo fix.
cmlenz
parents: 102
diff changeset
264 for template expressions.
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
265 """
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
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
267 def visitGetattr(self, node, locals_=False):
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
268 return ast.CallFunc(ast.Name('_lookup_attr'), [
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
269 ast.Name('data'), self.visit(node.expr, locals_=locals_),
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
270 ast.Const(node.attrname)
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
271 ])
30
2ee9f28e16e5 Experimental support for using the new native AST in Python 2.5 instead of the `compiler` package.
cmlenz
parents: 27
diff changeset
272
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
273 def visitLambda(self, node, locals_=False):
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
274 node.code = self.visit(node.code, locals_=True)
118
226613431921 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
275 node.filename = '<string>' # workaround for bug in pycodegen
226613431921 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
276 return node
226613431921 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
277
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
278 def visitListComp(self, node, locals_=False):
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
279 node.expr = self.visit(node.expr, locals_=True)
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
280 node.quals = map(lambda x: self.visit(x, locals_=True), node.quals)
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
281 return node
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
282
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
283 def visitName(self, node, locals_=False):
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
284 func_args = [ast.Name('data'), ast.Const(node.name)]
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
285 if locals_:
88
9ecae580dd93 Add support for list comprehension in expressions (see #12).
cmlenz
parents: 87
diff changeset
286 func_args.append(ast.CallFunc(ast.Name('locals'), []))
116
88ac4c680120 Merged [135:138/branches/experimental/cspeedups].
cmlenz
parents: 112
diff changeset
287 return ast.CallFunc(ast.Name('_lookup_name'), func_args)
81
cc034182061e Template expressions are now compiled to Python bytecode.
cmlenz
parents: 69
diff changeset
288
131
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
289 def visitSubscript(self, node, locals_=False):
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
290 return ast.CallFunc(ast.Name('_lookup_item'), [
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
291 ast.Name('data'), self.visit(node.expr, locals_=locals_),
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
292 ast.Tuple(map(lambda x: self.visit(x, locals_=locals_), node.subs))
203f459e7e26 * Support for line numbers in exceptions in expression evaluation (#22).
cmlenz
parents: 120
diff changeset
293 ])
Copyright (C) 2012-2017 Edgewall Software