Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/PythonExpr.py @ 4524:68bbefb72825
Allow HTMLRequest.batch to filter on other permissions than "View"...
...(e.g. on the new "Search" permission") by adding a "permission"
parameter. Thanks to Eli Collins for the patch. Closes issue2550699.
| author | Ralf Schlatterbeck <schlatterbeck@users.sourceforge.net> |
|---|---|
| date | Fri, 15 Jul 2011 14:13:51 +0000 |
| parents | b43efe461b3e |
| children | 6e3e4f24c753 |
| rev | line source |
|---|---|
| 1049 | 1 ############################################################################## |
| 2 # | |
| 3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved. | |
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4 # |
| 1049 | 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 | |
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11 # |
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12 ############################################################################## |
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13 # Modified for Roundup: |
| 1049 | 14 # |
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15 # 1. more informative traceback info |
| 1049 | 16 |
| 17 """Generic Python Expression Handler | |
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18 """ |
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Adhering to ZPL
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19 |
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20 __version__='$Revision: 1.6 $'[11:-2] |
| 1049 | 21 |
| 22 from TALES import CompilerError | |
| 23 from sys import exc_info | |
| 24 | |
| 25 class getSecurityManager: | |
| 26 '''Null security manager''' | |
| 27 def validate(self, *args, **kwargs): | |
| 28 return 1 | |
| 29 addContext = removeContext = validateValue = validate | |
| 30 | |
| 31 class PythonExpr: | |
| 32 def __init__(self, name, expr, engine): | |
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33 self.expr = expr = expr.strip().replace('\n', ' ') |
| 1049 | 34 try: |
| 35 d = {} | |
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36 exec 'def f():\n return %s\n' % expr.strip() in d |
| 1049 | 37 self._f = d['f'] |
| 38 except: | |
| 39 raise CompilerError, ('Python expression error:\n' | |
| 40 '%s: %s') % exc_info()[:2] | |
| 41 self._get_used_names() | |
| 42 | |
| 43 def _get_used_names(self): | |
| 44 self._f_varnames = vnames = [] | |
| 45 for vname in self._f.func_code.co_names: | |
| 46 if vname[0] not in '$_': | |
| 47 vnames.append(vname) | |
| 48 | |
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49 def _bind_used_names(self, econtext, _marker=[]): |
| 1049 | 50 # Bind template variables |
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51 names = {'CONTEXTS': econtext.contexts} |
| 1049 | 52 vars = econtext.vars |
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53 getType = econtext.getCompiler().getTypes().get |
| 1049 | 54 for vname in self._f_varnames: |
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55 val = vars.get(vname, _marker) |
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56 if val is _marker: |
| 1049 | 57 has = val = getType(vname) |
| 58 if has: | |
| 59 val = ExprTypeProxy(vname, val, econtext) | |
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60 names[vname] = val |
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2005
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61 else: |
| 1049 | 62 names[vname] = val |
| 63 return names | |
| 64 | |
| 65 def __call__(self, econtext): | |
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much nicer error messages when there's a templating error
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66 __traceback_info__ = 'python expression "%s"'%self.expr |
| 1049 | 67 f = self._f |
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68 f.func_globals.update(self._bind_used_names(econtext)) |
| 1049 | 69 return f() |
| 70 | |
| 71 def __str__(self): | |
| 72 return 'Python expression "%s"' % self.expr | |
| 73 def __repr__(self): | |
| 74 return '<PythonExpr %s>' % self.expr | |
| 75 | |
| 76 class ExprTypeProxy: | |
| 77 '''Class that proxies access to an expression type handler''' | |
| 78 def __init__(self, name, handler, econtext): | |
| 79 self._name = name | |
| 80 self._handler = handler | |
| 81 self._econtext = econtext | |
| 82 def __call__(self, text): | |
| 83 return self._handler(self._name, text, | |
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84 self._econtext.getCompiler())(self._econtext) |
| 1049 | 85 |