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annotate PageTemplates/Expressions.py @ 1042:adcfdeac4e76

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author Richard Jones <richard@users.sourceforge.net>
date Wed, 04 Sep 2002 04:47:28 +0000
parents a3a8ac7b8c40
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
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14 """Page Template Expression Engine
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15
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16 Page Template-specific implementation of TALES, with handlers
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17 for Python expressions, string literals, and paths.
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18 """
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19
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20 __version__='$Revision: 1.1 $'[11:-2]
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21
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22 import re, sys
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23 from TALES import Engine, CompilerError, _valid_name, NAME_RE, \
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24 Undefined, Default, _parse_expr
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25 from string import strip, split, join, replace, lstrip
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26 from Acquisition import aq_base, aq_inner, aq_parent
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27
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28
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29 _engine = None
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30 def getEngine():
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31 global _engine
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32 if _engine is None:
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33 from PathIterator import Iterator
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34 _engine = Engine(Iterator)
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35 installHandlers(_engine)
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36 return _engine
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37
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38 def installHandlers(engine):
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39 reg = engine.registerType
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40 pe = PathExpr
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41 for pt in ('standard', 'path', 'exists', 'nocall'):
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42 reg(pt, pe)
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43 reg('string', StringExpr)
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44 reg('python', PythonExpr)
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45 reg('not', NotExpr)
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46 reg('defer', DeferExpr)
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47
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48 if sys.modules.has_key('Zope'):
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49 import AccessControl
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50 from AccessControl import getSecurityManager
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51 try:
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52 from AccessControl import Unauthorized
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53 except ImportError:
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54 Unauthorized = "Unauthorized"
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55 if hasattr(AccessControl, 'full_read_guard'):
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56 from ZRPythonExpr import PythonExpr, _SecureModuleImporter, \
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57 call_with_ns
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58 else:
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59 from ZPythonExpr import PythonExpr, _SecureModuleImporter, \
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60 call_with_ns
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61 else:
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62 from PythonExpr import getSecurityManager, PythonExpr
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63 try:
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64 from zExceptions import Unauthorized
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65 except ImportError:
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66 Unauthorized = "Unauthorized"
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67 def call_with_ns(f, ns, arg=1):
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68 if arg==2:
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69 return f(None, ns)
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70 else:
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71 return f(ns)
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72
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73 class _SecureModuleImporter:
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74 """Simple version of the importer for use with trusted code."""
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75 __allow_access_to_unprotected_subobjects__ = 1
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76 def __getitem__(self, module):
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77 __import__(module)
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78 return sys.modules[module]
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79
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80 SecureModuleImporter = _SecureModuleImporter()
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81
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82 Undefs = (Undefined, AttributeError, KeyError,
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83 TypeError, IndexError, Unauthorized)
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84
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85 def render(ob, ns):
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86 """
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87 Calls the object, possibly a document template, or just returns it if
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88 not callable. (From DT_Util.py)
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89 """
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90 if hasattr(ob, '__render_with_namespace__'):
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91 ob = call_with_ns(ob.__render_with_namespace__, ns)
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92 else:
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93 base = aq_base(ob)
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94 if callable(base):
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95 try:
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96 if getattr(base, 'isDocTemp', 0):
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97 ob = call_with_ns(ob, ns, 2)
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98 else:
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99 ob = ob()
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100 except AttributeError, n:
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101 if str(n) != '__call__':
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102 raise
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103 return ob
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104
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105 class SubPathExpr:
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106 def __init__(self, path):
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107 self._path = path = split(strip(path), '/')
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108 self._base = base = path.pop(0)
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109 if not _valid_name(base):
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110 raise CompilerError, 'Invalid variable name "%s"' % base
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111 # Parse path
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112 self._dp = dp = []
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113 for i in range(len(path)):
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114 e = path[i]
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115 if e[:1] == '?' and _valid_name(e[1:]):
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116 dp.append((i, e[1:]))
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117 dp.reverse()
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118
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119 def _eval(self, econtext,
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120 list=list, isinstance=isinstance, StringType=type('')):
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121 vars = econtext.vars
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122 path = self._path
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123 if self._dp:
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124 path = list(path) # Copy!
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125 for i, varname in self._dp:
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126 val = vars[varname]
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127 if isinstance(val, StringType):
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128 path[i] = val
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129 else:
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130 # If the value isn't a string, assume it's a sequence
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131 # of path names.
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132 path[i:i+1] = list(val)
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133 __traceback_info__ = base = self._base
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134 if base == 'CONTEXTS':
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135 ob = econtext.contexts
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136 else:
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137 ob = vars[base]
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138 if isinstance(ob, DeferWrapper):
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139 ob = ob()
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140 if path:
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141 ob = restrictedTraverse(ob, path, getSecurityManager())
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142 return ob
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143
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144 class PathExpr:
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145 def __init__(self, name, expr, engine):
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146 self._s = expr
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147 self._name = name
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148 paths = split(expr, '|')
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149 self._subexprs = []
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150 add = self._subexprs.append
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151 for i in range(len(paths)):
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
152 path = lstrip(paths[i])
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
153 if _parse_expr(path):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
154 # This part is the start of another expression type,
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
155 # so glue it back together and compile it.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
156 add(engine.compile(lstrip(join(paths[i:], '|'))))
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
157 break
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
158 add(SubPathExpr(path)._eval)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
159
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
160 def _exists(self, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
161 for expr in self._subexprs:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
162 try:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
163 expr(econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
164 except Undefs:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
165 pass
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
166 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
167 return 1
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
168 return 0
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
169
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
170 def _eval(self, econtext,
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
171 isinstance=isinstance, StringType=type(''), render=render):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
172 for expr in self._subexprs[:-1]:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
173 # Try all but the last subexpression, skipping undefined ones.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
174 try:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
175 ob = expr(econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
176 except Undefs:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
177 pass
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
178 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
179 break
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
180 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
181 # On the last subexpression allow exceptions through.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
182 ob = self._subexprs[-1](econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
183
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
184 if self._name == 'nocall' or isinstance(ob, StringType):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
185 return ob
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
186 # Return the rendered object
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
187 return render(ob, econtext.vars)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
188
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
189 def __call__(self, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
190 if self._name == 'exists':
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
191 return self._exists(econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
192 return self._eval(econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
193
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
194 def __str__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
195 return '%s expression %s' % (self._name, `self._s`)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
196
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
197 def __repr__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
198 return '%s:%s' % (self._name, `self._s`)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
199
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
200
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
201 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/%(n)s)*)}' % {'n': NAME_RE})
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
202
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
203 class StringExpr:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
204 def __init__(self, name, expr, engine):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
205 self._s = expr
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
206 if '%' in expr:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
207 expr = replace(expr, '%', '%%')
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
208 self._vars = vars = []
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
209 if '$' in expr:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
210 parts = []
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
211 for exp in split(expr, '$$'):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
212 if parts: parts.append('$')
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
213 m = _interp.search(exp)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
214 while m is not None:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
215 parts.append(exp[:m.start()])
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
216 parts.append('%s')
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
217 vars.append(PathExpr('path', m.group(1) or m.group(2),
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
218 engine))
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
219 exp = exp[m.end():]
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
220 m = _interp.search(exp)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
221 if '$' in exp:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
222 raise CompilerError, (
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
223 '$ must be doubled or followed by a simple path')
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
224 parts.append(exp)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
225 expr = join(parts, '')
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
226 self._expr = expr
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
227
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
228 def __call__(self, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
229 vvals = []
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
230 for var in self._vars:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
231 v = var(econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
232 if isinstance(v, Exception):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
233 raise v
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
234 vvals.append(v)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
235 return self._expr % tuple(vvals)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
236
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
237 def __str__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
238 return 'string expression %s' % `self._s`
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
239
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
240 def __repr__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
241 return 'string:%s' % `self._s`
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
242
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
243 class NotExpr:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
244 def __init__(self, name, expr, compiler):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
245 self._s = expr = lstrip(expr)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
246 self._c = compiler.compile(expr)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
247
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
248 def __call__(self, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
249 return not econtext.evaluateBoolean(self._c)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
250
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
251 def __repr__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
252 return 'not:%s' % `self._s`
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
253
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
254 class DeferWrapper:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
255 def __init__(self, expr, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
256 self._expr = expr
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
257 self._econtext = econtext
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
258
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
259 def __str__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
260 return str(self())
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
261
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
262 def __call__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
263 return self._expr(self._econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
264
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
265 class DeferExpr:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
266 def __init__(self, name, expr, compiler):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
267 self._s = expr = lstrip(expr)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
268 self._c = compiler.compile(expr)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
269
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
270 def __call__(self, econtext):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
271 return DeferWrapper(self._c, econtext)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
272
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
273 def __repr__(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
274 return 'defer:%s' % `self._s`
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
275
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
276
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
277 def restrictedTraverse(self, path, securityManager,
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
278 get=getattr, has=hasattr, N=None, M=[],
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
279 TupleType=type(()) ):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
280
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
281 REQUEST = {'path': path}
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
282 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy!
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
283 if not path[0]:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
284 # If the path starts with an empty string, go to the root first.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
285 self = self.getPhysicalRoot()
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
286 if not securityManager.validateValue(self):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
287 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
288 path.pop(0)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
289
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
290 path.reverse()
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
291 validate = securityManager.validate
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
292 object = self
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
293 #print 'TRAVERSE', (object, path)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
294 while path:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
295 __traceback_info__ = REQUEST
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
296 name = path.pop()
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
297
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
298 if isinstance(name, TupleType):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
299 object = apply(object, name)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
300 continue
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
301
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
302 if name[0] == '_':
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
303 # Never allowed in a URL.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
304 raise AttributeError, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
305
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
306 if name=='..':
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Richard Jones <richard@users.sourceforge.net>
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diff changeset
307 o = get(object, 'aq_parent', M)
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Richard Jones <richard@users.sourceforge.net>
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diff changeset
308 if o is not M:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
309 if not validate(object, object, name, o):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
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310 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
311 object=o
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
312 continue
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
313
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
314 t = get(object, '__bobo_traverse__', N)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
315 if t is not N:
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
316 o=t(REQUEST, name)
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Richard Jones <richard@users.sourceforge.net>
parents:
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317
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
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318 container = None
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
319 if has(o, 'im_self'):
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Richard Jones <richard@users.sourceforge.net>
parents:
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320 container = o.im_self
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
321 elif (has(get(object, 'aq_base', object), name)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
322 and get(object, name) == o):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
323 container = object
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
324 if not validate(object, container, name, o):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
325 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
326 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
327 # Try an attribute.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
328 o = get(object, name, M)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
329 # print '...', (object, name, M, o)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
330 if o is not M:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
331 # Check access to the attribute.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
332 if has(object, 'aq_acquire'):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
333 object.aq_acquire(
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
334 name, validate2, validate)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
335 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
336 if not validate(object, object, name, o):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
337 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
338 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
339 # Try an item.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
340 try:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
341 # XXX maybe in Python 2.2 we can just check whether
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
342 # the object has the attribute "__getitem__"
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
343 # instead of blindly catching exceptions.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
344 # print 'Try an item', (object, name)
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Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
345 o = object[name]
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
346 except AttributeError, exc:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
347 if str(exc).find('__getitem__') >= 0:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
348 # The object does not support the item interface.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
349 # Try to re-raise the original attribute error.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
350 # XXX I think this only happens with
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
351 # ExtensionClass instances.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
352 get(object, name)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
353 raise
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
354 except TypeError, exc:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
355 if str(exc).find('unsubscriptable') >= 0:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
356 # The object does not support the item interface.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
357 # Try to re-raise the original attribute error.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
358 # XXX This is sooooo ugly.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
359 get(object, name)
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
360 raise
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
361 else:
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
362 # Check access to the item.
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
363 if not validate(object, object, name, o):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
364 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
365 #print '... object is now', `o`
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
366 object = o
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
367
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
368 return object
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
369
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
370
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
371 def validate2(orig, inst, name, v, real_validate):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
372 if not real_validate(orig, inst, name, v):
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
373 raise Unauthorized, name
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
374 return 1
a3a8ac7b8c40 Adding PageTemplates to the dist
Richard Jones <richard@users.sourceforge.net>
parents:
diff changeset
375
Roundup Issue Tracker: http://roundup-tracker.org/