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annotate roundup/cgi/PageTemplates/PythonExpr.py @ 8562:9c3ec0a5c7fc

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chore: remove __future print_funcion from code. Not needed as of Python 3.
author John Rouillard <rouilj@ieee.org>
date Wed, 08 Apr 2026 21:39:40 -0400
parents fed0f839c260
children
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001 Zope Corporation and Contributors. All Rights Reserved.
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4 #
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5 # This software is subject to the provisions of the Zope Public License,
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6 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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7 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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8 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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9 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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10 # FOR A PARTICULAR PURPOSE
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11 #
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12 ##############################################################################
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13 # Modified for Roundup:
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14 #
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15 # 1. more informative traceback info
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16
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17 """Generic Python Expression Handler
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18 """
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19
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20 import symtable
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21
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22 from .TALES import CompilerError
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23 from sys import exc_info
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24
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25 class getSecurityManager:
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26 '''Null security manager'''
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27 def validate(self, *args, **kwargs):
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28 return 1
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29 addContext = removeContext = validateValue = validate
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30
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31 class PythonExpr:
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32 def __init__(self, name, expr, engine):
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33 self.expr = expr = expr.strip().replace('\n', ' ')
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34 try:
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35 d = {}
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36 self.f_code = 'def f():\n return %s\n' % expr.strip()
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37 exec(self.f_code, d)
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38 self._f = d['f']
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39 except Exception:
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40 raise CompilerError(('Python expression error:\n'
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41 '%s: %s') % exc_info()[:2])
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42 self._get_used_names()
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43
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44 def _get_used_names(self):
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45 self._f_varnames = vnames = []
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46 for vname in self._get_from_symtab():
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47 if vname[0] not in '$_.':
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48 vnames.append(vname)
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50 def _get_from_symtab(self):
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51 """
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52 Get the variables used in the 'f' function.
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53 """
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54 variables = set()
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55 table = symtable.symtable(self.f_code, "<string>", "exec")
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56 if table.has_children():
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57 variables.update(self._walk_children(table))
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58 return variables
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59
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60 def _walk_children(self, sym):
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61 """
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62 Get the variables at this level. Recurse to get them all.
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63 """
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64 variables = set()
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65 for child in sym.get_children():
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66 variables.update(set(child.get_identifiers()))
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67 if child.has_children():
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68 variables.update(self._walk_children(child))
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69 return variables
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70
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71 def _bind_used_names(self, econtext, _marker=[]):
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72 # Bind template variables
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73 names = {'CONTEXTS': econtext.contexts}
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74 variables = econtext.vars
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75 getType = econtext.getCompiler().getTypes().get
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76 for vname in self._f_varnames:
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77 val = variables.get(vname, _marker)
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78 if val is _marker:
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79 has = val = getType(vname)
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80 if has:
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81 val = ExprTypeProxy(vname, val, econtext)
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82 names[vname] = val
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83 else:
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84 names[vname] = val
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85 return names
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86
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87 def __call__(self, econtext):
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88 __traceback_info__ = 'python expression "%s"'%self.expr
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89 f = self._f
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90 f.__globals__.update(self._bind_used_names(econtext))
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91 return f()
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92
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93 def __str__(self):
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94 return 'Python expression "%s"' % self.expr
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95 def __repr__(self):
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96 return '<PythonExpr %s>' % self.expr
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97
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98 class ExprTypeProxy:
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99 '''Class that proxies access to an expression type handler'''
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100 def __init__(self, name, handler, econtext):
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101 self._name = name
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102 self._handler = handler
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103 self._econtext = econtext
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104 def __call__(self, text):
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105 return self._handler(self._name, text,
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106 self._econtext.getCompiler())(self._econtext)
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107
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