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annotate roundup/cgi/PageTemplates/PythonExpr.py @ 5729:9ea2ce9d10cf

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A few internet references report that etags for the same underlying resource but with different representation (xml, json ...) should have different etags. That is currently not the case. Added code to allow incorporation of representation info into the etag. By default the representation is "json", but future patches can pass the representation down and modify flow to match requested representation.
author John Rouillard <rouilj@ieee.org>
date Sat, 25 May 2019 14:23:16 -0400
parents e70885fe72a4
children fed0f839c260
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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:
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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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