Mercurial > p > roundup > code
annotate roundup/cgi/PageTemplates/PythonExpr.py @ 5384:c4774b9f483c
Python 3 preparation: convert exec to a function.
Tool-generated patch.
| author | Joseph Myers <jsm@polyomino.org.uk> |
|---|---|
| date | Tue, 24 Jul 2018 22:11:16 +0000 |
| parents | 35ea9b1efc14 |
| children | d26921b851c3 |
| 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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parents:
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11 # |
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update PageTemplates to latest Zope codebase
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parents:
2005
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12 ############################################################################## |
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b43efe461b3e
update PageTemplates to latest Zope codebase
Richard Jones <richard@users.sourceforge.net>
parents:
2005
diff
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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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parents:
2005
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18 """ |
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Adhering to ZPL
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19 |
| 1049 | 20 from TALES import CompilerError |
| 21 from sys import exc_info | |
| 22 | |
| 23 class getSecurityManager: | |
| 24 '''Null security manager''' | |
| 25 def validate(self, *args, **kwargs): | |
| 26 return 1 | |
| 27 addContext = removeContext = validateValue = validate | |
| 28 | |
| 29 class PythonExpr: | |
| 30 def __init__(self, name, expr, engine): | |
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31 self.expr = expr = expr.strip().replace('\n', ' ') |
| 1049 | 32 try: |
| 33 d = {} | |
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Python 3 preparation: convert exec to a function.
Joseph Myers <jsm@polyomino.org.uk>
parents:
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diff
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34 exec('def f():\n return %s\n' % expr.strip(), d) |
| 1049 | 35 self._f = d['f'] |
| 36 except: | |
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Python 3 preparation: "raise" syntax.
Joseph Myers <jsm@polyomino.org.uk>
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37 raise CompilerError(('Python expression error:\n' |
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35ea9b1efc14
Python 3 preparation: "raise" syntax.
Joseph Myers <jsm@polyomino.org.uk>
parents:
4570
diff
changeset
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38 '%s: %s') % exc_info()[:2]) |
| 1049 | 39 self._get_used_names() |
| 40 | |
| 41 def _get_used_names(self): | |
| 42 self._f_varnames = vnames = [] | |
| 43 for vname in self._f.func_code.co_names: | |
| 44 if vname[0] not in '$_': | |
| 45 vnames.append(vname) | |
| 46 | |
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47 def _bind_used_names(self, econtext, _marker=[]): |
| 1049 | 48 # Bind template variables |
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49 names = {'CONTEXTS': econtext.contexts} |
| 1049 | 50 vars = econtext.vars |
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51 getType = econtext.getCompiler().getTypes().get |
| 1049 | 52 for vname in self._f_varnames: |
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53 val = vars.get(vname, _marker) |
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parents:
2005
diff
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54 if val is _marker: |
| 1049 | 55 has = val = getType(vname) |
| 56 if has: | |
| 57 val = ExprTypeProxy(vname, val, econtext) | |
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58 names[vname] = val |
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parents:
2005
diff
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59 else: |
| 1049 | 60 names[vname] = val |
| 61 return names | |
| 62 | |
| 63 def __call__(self, econtext): | |
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much nicer error messages when there's a templating error
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64 __traceback_info__ = 'python expression "%s"'%self.expr |
| 1049 | 65 f = self._f |
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66 f.func_globals.update(self._bind_used_names(econtext)) |
| 1049 | 67 return f() |
| 68 | |
| 69 def __str__(self): | |
| 70 return 'Python expression "%s"' % self.expr | |
| 71 def __repr__(self): | |
| 72 return '<PythonExpr %s>' % self.expr | |
| 73 | |
| 74 class ExprTypeProxy: | |
| 75 '''Class that proxies access to an expression type handler''' | |
| 76 def __init__(self, name, handler, econtext): | |
| 77 self._name = name | |
| 78 self._handler = handler | |
| 79 self._econtext = econtext | |
| 80 def __call__(self, text): | |
| 81 return self._handler(self._name, text, | |
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merged Zope Collector #372 fix from ZPT CVS trunk
Richard Jones <richard@users.sourceforge.net>
parents:
1071
diff
changeset
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82 self._econtext.getCompiler())(self._econtext) |
| 1049 | 83 |