Mercurial > p > roundup > code

annotate roundup/cgi/PageTemplates/PythonExpr.py @ 1049:b9988e118055

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
moved
author Richard Jones <richard@users.sourceforge.net>
date Thu, 05 Sep 2002 00:37:09 +0000
parents
children 0f9aa62917bd
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
1 ##############################################################################
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
2 #
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
4 #
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
5 # This software is subject to the provisions of the Zope Public License,
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
10 # FOR A PARTICULAR PURPOSE
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
11 #
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
12 ##############################################################################
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
13
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
14 """Generic Python Expression Handler
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
15 """
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
16
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
17 __version__='$Revision: 1.1 $'[11:-2]
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
18
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
19 from TALES import CompilerError
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
20 from string import strip, split, join, replace, lstrip
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
21 from sys import exc_info
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
22
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
23 class getSecurityManager:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
24 '''Null security manager'''
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
25 def validate(self, *args, **kwargs):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
26 return 1
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
27 addContext = removeContext = validateValue = validate
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
28
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
29 class PythonExpr:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
30 def __init__(self, name, expr, engine):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
31 self.expr = expr = replace(strip(expr), '\n', ' ')
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
32 try:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
33 d = {}
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
34 exec 'def f():\n return %s\n' % strip(expr) in d
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
35 self._f = d['f']
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
36 except:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
37 raise CompilerError, ('Python expression error:\n'
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
38 '%s: %s') % exc_info()[:2]
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
39 self._get_used_names()
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
40
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
41 def _get_used_names(self):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
42 self._f_varnames = vnames = []
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
43 for vname in self._f.func_code.co_names:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
44 if vname[0] not in '$_':
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
45 vnames.append(vname)
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
46
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
47 def _bind_used_names(self, econtext):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
48 # Bind template variables
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
49 names = {}
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
50 vars = econtext.vars
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
51 getType = econtext._engine.getTypes().get
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
52 for vname in self._f_varnames:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
53 has, val = vars.has_get(vname)
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
54 if not has:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
55 has = val = getType(vname)
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
56 if has:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
57 val = ExprTypeProxy(vname, val, econtext)
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
58 if has:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
59 names[vname] = val
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
60 return names
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
61
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
62 def __call__(self, econtext):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
63 __traceback_info__ = self.expr
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
64 f = self._f
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
65 f.func_globals.update(self._bind_used_names(econtext))
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
66 return f()
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
67
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
68 def __str__(self):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
69 return 'Python expression "%s"' % self.expr
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
70 def __repr__(self):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
71 return '<PythonExpr %s>' % self.expr
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
72
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
73 class ExprTypeProxy:
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
74 '''Class that proxies access to an expression type handler'''
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
75 def __init__(self, name, handler, econtext):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
76 self._name = name
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
77 self._handler = handler
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
78 self._econtext = econtext
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
79 def __call__(self, text):
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
80 return self._handler(self._name, text,
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
81 self._econtext._engine)(self._econtext)
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
82
Roundup Issue Tracker: http://roundup-tracker.org/