Mercurial > p > roundup > code

annotate roundup/cgi/PageTemplates/Expressions.py @ 2119:cc4667ef3f12

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Added the ability to toggle where error messages go. They either go to the user (default, for backwards compatibility), the dispatcher, or both. These are able to be toggled via settings in config.py. Please refer to upgrading.txt for more details. (And Richard, let me know if I've done anything wrong with this checkin. :))
author Eddie Parker <eparker@users.sourceforge.net>
date Thu, 25 Mar 2004 19:27:15 +0000
parents fc52d57c6c3e
children b43efe461b3e
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
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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 Modified for Roundup 0.5 release:
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21
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22 - Removed all Zope-specific code (doesn't even try to import that stuff now)
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23 - Removed all Acquisition
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24 - Made traceback info more informative
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25
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26 """
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27 __docformat__ = 'restructuredtext'
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28
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29 __version__='$Revision: 1.9 $'[11:-2]
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30
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31 import re, sys
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32 from TALES import Engine, CompilerError, _valid_name, NAME_RE, \
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33 Undefined, Default, _parse_expr
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34 from string import strip, split, join, replace, lstrip
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35
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36 _engine = None
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37 def getEngine():
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38 global _engine
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39 if _engine is None:
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40 from PathIterator import Iterator
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41 _engine = Engine(Iterator)
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42 installHandlers(_engine)
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43 return _engine
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44
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45 def installHandlers(engine):
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46 reg = engine.registerType
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47 pe = PathExpr
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48 for pt in ('standard', 'path', 'exists', 'nocall'):
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49 reg(pt, pe)
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50 reg('string', StringExpr)
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51 reg('python', PythonExpr)
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52 reg('not', NotExpr)
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53 reg('defer', DeferExpr)
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54
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55 from PythonExpr import getSecurityManager, PythonExpr
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56 try:
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57 from zExceptions import Unauthorized
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58 except ImportError:
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59 Unauthorized = "Unauthorized"
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60 def call_with_ns(f, ns, arg=1):
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61 if arg==2:
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62 return f(None, ns)
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63 else:
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64 return f(ns)
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65
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66 class _SecureModuleImporter:
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67 """Simple version of the importer for use with trusted code."""
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68 __allow_access_to_unprotected_subobjects__ = 1
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69 def __getitem__(self, module):
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70 __import__(module)
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71 return sys.modules[module]
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72
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73 Undefs = (Undefined, AttributeError, KeyError,
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74 TypeError, IndexError, Unauthorized)
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75
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76 def render(ob, ns):
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77 """
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78 Calls the object, possibly a document template, or just returns it if
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79 not callable. (From DT_Util.py)
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80 """
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81 if hasattr(ob, '__render_with_namespace__'):
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82 ob = call_with_ns(ob.__render_with_namespace__, ns)
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83 else:
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84 base = ob
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85 if callable(base):
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86 try:
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87 if getattr(base, 'isDocTemp', 0):
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88 ob = call_with_ns(ob, ns, 2)
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89 else:
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90 ob = ob()
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91 except AttributeError, n:
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92 if str(n) != '__call__':
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93 raise
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94 return ob
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95
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96 class SubPathExpr:
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97 def __init__(self, path):
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98 self._path = path = split(strip(path), '/')
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99 self._base = base = path.pop(0)
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100 if not _valid_name(base):
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101 raise CompilerError, 'Invalid variable name "%s"' % base
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102 # Parse path
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103 self._dp = dp = []
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104 for i in range(len(path)):
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105 e = path[i]
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106 if e[:1] == '?' and _valid_name(e[1:]):
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107 dp.append((i, e[1:]))
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108 dp.reverse()
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109
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110 def _eval(self, econtext,
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111 list=list, isinstance=isinstance, StringType=type('')):
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112 vars = econtext.vars
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113 path = self._path
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114 if self._dp:
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115 path = list(path) # Copy!
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116 for i, varname in self._dp:
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117 val = vars[varname]
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118 if isinstance(val, StringType):
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119 path[i] = val
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120 else:
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121 # If the value isn't a string, assume it's a sequence
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122 # of path names.
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123 path[i:i+1] = list(val)
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124 base = self._base
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125 __traceback_info__ = 'path expression "%s"'%('/'.join(self._path))
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126 if base == 'CONTEXTS':
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127 ob = econtext.contexts
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128 else:
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129 ob = vars[base]
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130 if isinstance(ob, DeferWrapper):
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131 ob = ob()
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132 if path:
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133 ob = restrictedTraverse(ob, path, getSecurityManager())
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134 return ob
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135
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136 class PathExpr:
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137 def __init__(self, name, expr, engine):
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138 self._s = expr
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139 self._name = name
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140 self._hybrid = 0
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141 paths = split(expr, '|')
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142 self._subexprs = []
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143 add = self._subexprs.append
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144 for i in range(len(paths)):
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145 path = lstrip(paths[i])
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146 if _parse_expr(path):
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147 # This part is the start of another expression type,
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148 # so glue it back together and compile it.
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149 add(engine.compile(lstrip(join(paths[i:], '|'))))
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150 self._hybrid = 1
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151 break
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152 add(SubPathExpr(path)._eval)
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153
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154 def _exists(self, econtext):
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155 for expr in self._subexprs:
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156 try:
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157 expr(econtext)
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158 except Undefs:
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159 pass
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160 else:
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161 return 1
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162 return 0
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163
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164 def _eval(self, econtext,
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165 isinstance=isinstance, StringType=type(''), render=render):
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166 for expr in self._subexprs[:-1]:
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167 # Try all but the last subexpression, skipping undefined ones.
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168 try:
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169 ob = expr(econtext)
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170 except Undefs:
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171 pass
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172 else:
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173 break
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174 else:
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175 # On the last subexpression allow exceptions through, and
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176 # don't autocall if the expression was not a subpath.
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177 ob = self._subexprs[-1](econtext)
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178 if self._hybrid:
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179 return ob
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180
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181 if self._name == 'nocall' or isinstance(ob, StringType):
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182 return ob
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183 # Return the rendered object
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184 return render(ob, econtext.vars)
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185
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186 def __call__(self, econtext):
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187 if self._name == 'exists':
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188 return self._exists(econtext)
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189 return self._eval(econtext)
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190
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191 def __str__(self):
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192 return '%s expression %s' % (self._name, `self._s`)
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193
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194 def __repr__(self):
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195 return '%s:%s' % (self._name, `self._s`)
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196
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197
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198 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/%(n)s)*)}' % {'n': NAME_RE})
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199
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200 class StringExpr:
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201 def __init__(self, name, expr, engine):
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202 self._s = expr
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203 if '%' in expr:
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204 expr = replace(expr, '%', '%%')
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205 self._vars = vars = []
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206 if '$' in expr:
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207 parts = []
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208 for exp in split(expr, '$$'):
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209 if parts: parts.append('$')
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210 m = _interp.search(exp)
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211 while m is not None:
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212 parts.append(exp[:m.start()])
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213 parts.append('%s')
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214 vars.append(PathExpr('path', m.group(1) or m.group(2),
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215 engine))
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216 exp = exp[m.end():]
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217 m = _interp.search(exp)
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218 if '$' in exp:
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219 raise CompilerError, (
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220 '$ must be doubled or followed by a simple path')
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221 parts.append(exp)
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222 expr = join(parts, '')
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223 self._expr = expr
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224
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225 def __call__(self, econtext):
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226 vvals = []
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227 for var in self._vars:
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228 v = var(econtext)
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229 if isinstance(v, Exception):
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230 raise v
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231 vvals.append(v)
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232 return self._expr % tuple(vvals)
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233
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234 def __str__(self):
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235 return 'string expression %s' % `self._s`
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236
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237 def __repr__(self):
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238 return 'string:%s' % `self._s`
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239
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240 class NotExpr:
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241 def __init__(self, name, expr, compiler):
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242 self._s = expr = lstrip(expr)
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243 self._c = compiler.compile(expr)
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244
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245 def __call__(self, econtext):
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246 return not econtext.evaluateBoolean(self._c)
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247
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248 def __repr__(self):
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249 return 'not:%s' % `self._s`
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250
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251 class DeferWrapper:
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252 def __init__(self, expr, econtext):
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253 self._expr = expr
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254 self._econtext = econtext
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255
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256 def __str__(self):
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257 return str(self())
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258
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259 def __call__(self):
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260 return self._expr(self._econtext)
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261
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262 class DeferExpr:
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263 def __init__(self, name, expr, compiler):
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264 self._s = expr = lstrip(expr)
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265 self._c = compiler.compile(expr)
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266
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267 def __call__(self, econtext):
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268 return DeferWrapper(self._c, econtext)
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269
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270 def __repr__(self):
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271 return 'defer:%s' % `self._s`
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272
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273 class TraversalError:
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274 def __init__(self, path, name):
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275 self.path = path
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276 self.name = name
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277
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278 def restrictedTraverse(self, path, securityManager,
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279 get=getattr, has=hasattr, N=None, M=[],
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280 TupleType=type(()) ):
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281
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282 REQUEST = {'path': path}
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283 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy!
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284 if not path[0]:
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285 # If the path starts with an empty string, go to the root first.
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286 self = self.getPhysicalRoot()
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287 path.pop(0)
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288
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289 path.reverse()
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290 object = self
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291 #print 'TRAVERSE', (object, path)
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292 done = []
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293 while path:
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294 name = path.pop()
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295 __traceback_info__ = TraversalError(done, name)
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296
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297 # if isinstance(name, TupleType):
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298 # object = apply(object, name)
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299 # continue
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300
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301 # if name[0] == '_':
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302 # # Never allowed in a URL.
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303 # raise AttributeError, name
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304
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305 # Try an attribute.
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306 o = get(object, name, M)
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307 # print '...', (object, name, M, o)
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308 if o is M:
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309 # Try an item.
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310 # print '... try an item'
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311 try:
Richard Jones <richard@users.sourceforge.net>
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312 # XXX maybe in Python 2.2 we can just check whether
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313 # the object has the attribute "__getitem__"
Richard Jones <richard@users.sourceforge.net>
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314 # instead of blindly catching exceptions.
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315 o = object[name]
Richard Jones <richard@users.sourceforge.net>
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316 except AttributeError, exc:
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317 if str(exc).find('__getitem__') >= 0:
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318 # The object does not support the item interface.
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319 # Try to re-raise the original attribute error.
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320 # XXX I think this only happens with
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321 # ExtensionClass instances.
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322 get(object, name)
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323 raise
Richard Jones <richard@users.sourceforge.net>
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324 except TypeError, exc:
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325 if str(exc).find('unsubscriptable') >= 0:
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326 # The object does not support the item interface.
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327 # Try to re-raise the original attribute error.
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328 # XXX This is sooooo ugly.
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329 get(object, name)
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330 raise
Richard Jones <richard@users.sourceforge.net>
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331 #print '... object is now', `o`
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332 object = o
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333 done.append((name, o))
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334
Richard Jones <richard@users.sourceforge.net>
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335 return object
Richard Jones <richard@users.sourceforge.net>
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336
Roundup Issue Tracker: http://roundup-tracker.org/