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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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2005
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27 __docformat__ = 'restructuredtext'
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28
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2005
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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())
|
Richard Jones <richard@users.sourceforge.net>
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258
|
Richard Jones <richard@users.sourceforge.net>
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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)
|
Richard Jones <richard@users.sourceforge.net>
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265 self._c = compiler.compile(expr)
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
266
|
Richard Jones <richard@users.sourceforge.net>
parents:
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267 def __call__(self, econtext):
|
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268 return DeferWrapper(self._c, econtext)
|
Richard Jones <richard@users.sourceforge.net>
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|
269
|
Richard Jones <richard@users.sourceforge.net>
parents:
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270 def __repr__(self):
|
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271 return 'defer:%s' % `self._s`
|
Richard Jones <richard@users.sourceforge.net>
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|
272
|
|
1136
|
273 class TraversalError:
|
|
|
274 def __init__(self, path, name):
|
|
|
275 self.path = path
|
|
|
276 self.name = name
|
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277
|
Richard Jones <richard@users.sourceforge.net>
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278 def restrictedTraverse(self, path, securityManager,
|
Richard Jones <richard@users.sourceforge.net>
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|
279 get=getattr, has=hasattr, N=None, M=[],
|
Richard Jones <richard@users.sourceforge.net>
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|
280 TupleType=type(()) ):
|
Richard Jones <richard@users.sourceforge.net>
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|
281
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
282 REQUEST = {'path': path}
|
Richard Jones <richard@users.sourceforge.net>
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|
283 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy!
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
284 if not path[0]:
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
285 # If the path starts with an empty string, go to the root first.
|
Richard Jones <richard@users.sourceforge.net>
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|
286 self = self.getPhysicalRoot()
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
287 path.pop(0)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
288
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
289 path.reverse()
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
290 object = self
|
Richard Jones <richard@users.sourceforge.net>
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|
291 #print 'TRAVERSE', (object, path)
|
|
1101
|
292 done = []
|
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|
293 while path:
|
Richard Jones <richard@users.sourceforge.net>
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|
294 name = path.pop()
|
|
1136
|
295 __traceback_info__ = TraversalError(done, name)
|
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|
296
|
|
1181
|
297 # if isinstance(name, TupleType):
|
|
|
298 # object = apply(object, name)
|
|
|
299 # continue
|
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|
300
|
|
1079
|
301 # if name[0] == '_':
|
|
|
302 # # Never allowed in a URL.
|
|
|
303 # raise AttributeError, name
|
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|
304
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
305 # Try an attribute.
|
Richard Jones <richard@users.sourceforge.net>
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diff
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|
306 o = get(object, name, M)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
307 # print '...', (object, name, M, o)
|
Richard Jones <richard@users.sourceforge.net>
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diff
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|
308 if o is M:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
309 # Try an item.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
310 # print '... try an item'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
311 try:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
312 # XXX maybe in Python 2.2 we can just check whether
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
313 # the object has the attribute "__getitem__"
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
314 # instead of blindly catching exceptions.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
315 o = object[name]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
316 except AttributeError, exc:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
317 if str(exc).find('__getitem__') >= 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
318 # The object does not support the item interface.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
319 # Try to re-raise the original attribute error.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
320 # XXX I think this only happens with
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
321 # ExtensionClass instances.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
322 get(object, name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
323 raise
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
324 except TypeError, exc:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
325 if str(exc).find('unsubscriptable') >= 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
326 # The object does not support the item interface.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
327 # Try to re-raise the original attribute error.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
328 # XXX This is sooooo ugly.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
329 get(object, name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
330 raise
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
331 #print '... object is now', `o`
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
332 object = o
|
|
1136
|
333 done.append((name, o))
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
334
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
335 return object
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
336
|
