Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/PythonExpr.py @ 2005:fc52d57c6c3e
documentation cleanup
| author | Richard Jones <richard@users.sourceforge.net> |
|---|---|
| date | Wed, 11 Feb 2004 23:55:10 +0000 |
| parents | 93b80ad11ca8 |
| children | b43efe461b3e |
| rev | line source |
|---|---|
| 1049 | 1 ############################################################################## |
| 2 # | |
| 3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. | |
| 4 # | |
| 5 # This software is subject to the provisions of the Zope Public License, | |
| 6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution. | |
| 7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED | |
| 8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED | |
| 9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS | |
| 10 # FOR A PARTICULAR PURPOSE | |
| 11 # | |
| 12 ############################################################################## | |
| 13 | |
| 14 """Generic Python Expression Handler | |
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15 |
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parents:
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16 Modified for Roundup 0.5 release: |
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c08b3820edd1
Adhering to ZPL
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parents:
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diff
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17 |
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Adhering to ZPL
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parents:
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18 - more informative traceback info |
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c08b3820edd1
Adhering to ZPL
Richard Jones <richard@users.sourceforge.net>
parents:
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diff
changeset
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19 |
| 1049 | 20 """ |
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2005
fc52d57c6c3e
documentation cleanup
Richard Jones <richard@users.sourceforge.net>
parents:
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diff
changeset
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21 __docformat__ = 'restructuredtext' |
| 1049 | 22 |
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2005
fc52d57c6c3e
documentation cleanup
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parents:
1257
diff
changeset
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23 __version__='$Revision: 1.5 $'[11:-2] |
| 1049 | 24 |
| 25 from TALES import CompilerError | |
| 26 from string import strip, split, join, replace, lstrip | |
| 27 from sys import exc_info | |
| 28 | |
| 29 class getSecurityManager: | |
| 30 '''Null security manager''' | |
| 31 def validate(self, *args, **kwargs): | |
| 32 return 1 | |
| 33 addContext = removeContext = validateValue = validate | |
| 34 | |
| 35 class PythonExpr: | |
| 36 def __init__(self, name, expr, engine): | |
| 37 self.expr = expr = replace(strip(expr), '\n', ' ') | |
| 38 try: | |
| 39 d = {} | |
| 40 exec 'def f():\n return %s\n' % strip(expr) in d | |
| 41 self._f = d['f'] | |
| 42 except: | |
| 43 raise CompilerError, ('Python expression error:\n' | |
| 44 '%s: %s') % exc_info()[:2] | |
| 45 self._get_used_names() | |
| 46 | |
| 47 def _get_used_names(self): | |
| 48 self._f_varnames = vnames = [] | |
| 49 for vname in self._f.func_code.co_names: | |
| 50 if vname[0] not in '$_': | |
| 51 vnames.append(vname) | |
| 52 | |
| 53 def _bind_used_names(self, econtext): | |
| 54 # Bind template variables | |
| 55 names = {} | |
| 56 vars = econtext.vars | |
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Richard Jones <richard@users.sourceforge.net>
parents:
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diff
changeset
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57 getType = econtext.getCompiler().getTypes().get |
| 1049 | 58 for vname in self._f_varnames: |
| 59 has, val = vars.has_get(vname) | |
| 60 if not has: | |
| 61 has = val = getType(vname) | |
| 62 if has: | |
| 63 val = ExprTypeProxy(vname, val, econtext) | |
| 64 if has: | |
| 65 names[vname] = val | |
| 66 return names | |
| 67 | |
| 68 def __call__(self, econtext): | |
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69 __traceback_info__ = 'python expression "%s"'%self.expr |
| 1049 | 70 f = self._f |
| 71 f.func_globals.update(self._bind_used_names(econtext)) | |
| 72 return f() | |
| 73 | |
| 74 def __str__(self): | |
| 75 return 'Python expression "%s"' % self.expr | |
| 76 def __repr__(self): | |
| 77 return '<PythonExpr %s>' % self.expr | |
| 78 | |
| 79 class ExprTypeProxy: | |
| 80 '''Class that proxies access to an expression type handler''' | |
| 81 def __init__(self, name, handler, econtext): | |
| 82 self._name = name | |
| 83 self._handler = handler | |
| 84 self._econtext = econtext | |
| 85 def __call__(self, text): | |
| 86 return self._handler(self._name, text, | |
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1257
93b80ad11ca8
merged Zope Collector #372 fix from ZPT CVS trunk
Richard Jones <richard@users.sourceforge.net>
parents:
1071
diff
changeset
|
87 self._econtext.getCompiler())(self._econtext) |
| 1049 | 88 |