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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
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28 __version__='$Revision: 1.6 $'[11:-2]
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29
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30 import re, sys
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31 from TALES import Engine, CompilerError, _valid_name, NAME_RE, \
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32 Undefined, Default, _parse_expr
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33 from string import strip, split, join, replace, lstrip
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34
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35 _engine = None
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36 def getEngine():
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37 global _engine
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38 if _engine is None:
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39 from PathIterator import Iterator
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40 _engine = Engine(Iterator)
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41 installHandlers(_engine)
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42 return _engine
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43
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44 def installHandlers(engine):
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45 reg = engine.registerType
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46 pe = PathExpr
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47 for pt in ('standard', 'path', 'exists', 'nocall'):
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48 reg(pt, pe)
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49 reg('string', StringExpr)
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50 reg('python', PythonExpr)
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51 reg('not', NotExpr)
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52 reg('defer', DeferExpr)
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53
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54 from PythonExpr import getSecurityManager, PythonExpr
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55 try:
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56 from zExceptions import Unauthorized
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57 except ImportError:
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58 Unauthorized = "Unauthorized"
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59 def call_with_ns(f, ns, arg=1):
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60 if arg==2:
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61 return f(None, ns)
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62 else:
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63 return f(ns)
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64
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65 class _SecureModuleImporter:
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66 """Simple version of the importer for use with trusted code."""
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67 __allow_access_to_unprotected_subobjects__ = 1
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68 def __getitem__(self, module):
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69 __import__(module)
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70 return sys.modules[module]
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71
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72 Undefs = (Undefined, AttributeError, KeyError,
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73 TypeError, IndexError, Unauthorized)
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74
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75 def render(ob, ns):
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76 """
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77 Calls the object, possibly a document template, or just returns it if
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78 not callable. (From DT_Util.py)
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79 """
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80 if hasattr(ob, '__render_with_namespace__'):
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81 ob = call_with_ns(ob.__render_with_namespace__, ns)
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82 else:
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83 base = ob
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84 if callable(base):
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85 try:
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86 if getattr(base, 'isDocTemp', 0):
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87 ob = call_with_ns(ob, ns, 2)
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88 else:
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89 ob = ob()
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90 except AttributeError, n:
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91 if str(n) != '__call__':
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92 raise
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93 return ob
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94
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95 class SubPathExpr:
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96 def __init__(self, path):
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97 self._path = path = split(strip(path), '/')
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98 self._base = base = path.pop(0)
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99 if not _valid_name(base):
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100 raise CompilerError, 'Invalid variable name "%s"' % base
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101 # Parse path
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102 self._dp = dp = []
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103 for i in range(len(path)):
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104 e = path[i]
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105 if e[:1] == '?' and _valid_name(e[1:]):
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106 dp.append((i, e[1:]))
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107 dp.reverse()
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108
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109 def _eval(self, econtext,
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110 list=list, isinstance=isinstance, StringType=type('')):
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111 vars = econtext.vars
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112 path = self._path
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113 if self._dp:
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114 path = list(path) # Copy!
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115 for i, varname in self._dp:
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116 val = vars[varname]
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117 if isinstance(val, StringType):
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118 path[i] = val
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119 else:
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120 # If the value isn't a string, assume it's a sequence
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121 # of path names.
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122 path[i:i+1] = list(val)
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123 base = self._base
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124 __traceback_info__ = 'path expression "%s"'%('/'.join(self._path))
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125 if base == 'CONTEXTS':
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126 ob = econtext.contexts
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127 else:
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128 ob = vars[base]
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129 if isinstance(ob, DeferWrapper):
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130 ob = ob()
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131 if path:
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132 ob = restrictedTraverse(ob, path, getSecurityManager())
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133 return ob
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134
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135 class PathExpr:
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136 def __init__(self, name, expr, engine):
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137 self._s = expr
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138 self._name = name
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139 paths = split(expr, '|')
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140 self._subexprs = []
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141 add = self._subexprs.append
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142 for i in range(len(paths)):
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143 path = lstrip(paths[i])
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144 if _parse_expr(path):
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145 # This part is the start of another expression type,
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146 # so glue it back together and compile it.
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147 add(engine.compile(lstrip(join(paths[i:], '|'))))
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148 break
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149 add(SubPathExpr(path)._eval)
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150
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151 def _exists(self, econtext):
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152 for expr in self._subexprs:
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153 try:
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154 expr(econtext)
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155 except Undefs:
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156 pass
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157 else:
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158 return 1
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159 return 0
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160
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161 def _eval(self, econtext,
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162 isinstance=isinstance, StringType=type(''), render=render):
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163 for expr in self._subexprs[:-1]:
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164 # Try all but the last subexpression, skipping undefined ones.
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165 try:
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166 ob = expr(econtext)
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167 except Undefs:
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168 pass
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169 else:
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170 break
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171 else:
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172 # On the last subexpression allow exceptions through.
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173 ob = self._subexprs[-1](econtext)
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174
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175 if self._name == 'nocall' or isinstance(ob, StringType):
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176 return ob
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177 # Return the rendered object
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178 return render(ob, econtext.vars)
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179
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180 def __call__(self, econtext):
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181 if self._name == 'exists':
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182 return self._exists(econtext)
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183 return self._eval(econtext)
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184
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185 def __str__(self):
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186 return '%s expression %s' % (self._name, `self._s`)
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187
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188 def __repr__(self):
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189 return '%s:%s' % (self._name, `self._s`)
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190
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191
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192 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/%(n)s)*)}' % {'n': NAME_RE})
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193
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194 class StringExpr:
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195 def __init__(self, name, expr, engine):
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196 self._s = expr
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197 if '%' in expr:
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198 expr = replace(expr, '%', '%%')
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199 self._vars = vars = []
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200 if '$' in expr:
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201 parts = []
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202 for exp in split(expr, '$$'):
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203 if parts: parts.append('$')
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204 m = _interp.search(exp)
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205 while m is not None:
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206 parts.append(exp[:m.start()])
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207 parts.append('%s')
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208 vars.append(PathExpr('path', m.group(1) or m.group(2),
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209 engine))
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210 exp = exp[m.end():]
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211 m = _interp.search(exp)
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212 if '$' in exp:
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213 raise CompilerError, (
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214 '$ must be doubled or followed by a simple path')
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215 parts.append(exp)
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216 expr = join(parts, '')
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217 self._expr = expr
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218
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219 def __call__(self, econtext):
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220 vvals = []
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221 for var in self._vars:
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222 v = var(econtext)
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223 if isinstance(v, Exception):
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224 raise v
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225 vvals.append(v)
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226 return self._expr % tuple(vvals)
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227
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228 def __str__(self):
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229 return 'string expression %s' % `self._s`
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230
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231 def __repr__(self):
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232 return 'string:%s' % `self._s`
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233
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234 class NotExpr:
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235 def __init__(self, name, expr, compiler):
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236 self._s = expr = lstrip(expr)
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237 self._c = compiler.compile(expr)
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238
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239 def __call__(self, econtext):
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240 return not econtext.evaluateBoolean(self._c)
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241
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242 def __repr__(self):
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243 return 'not:%s' % `self._s`
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244
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Richard Jones <richard@users.sourceforge.net>
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245 class DeferWrapper:
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246 def __init__(self, expr, econtext):
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247 self._expr = expr
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Richard Jones <richard@users.sourceforge.net>
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248 self._econtext = econtext
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249
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Richard Jones <richard@users.sourceforge.net>
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250 def __str__(self):
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251 return str(self())
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252
|
Richard Jones <richard@users.sourceforge.net>
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253 def __call__(self):
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254 return self._expr(self._econtext)
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255
|
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256 class DeferExpr:
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Richard Jones <richard@users.sourceforge.net>
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257 def __init__(self, name, expr, compiler):
|
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258 self._s = expr = lstrip(expr)
|
Richard Jones <richard@users.sourceforge.net>
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259 self._c = compiler.compile(expr)
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
260
|
Richard Jones <richard@users.sourceforge.net>
parents:
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261 def __call__(self, econtext):
|
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262 return DeferWrapper(self._c, econtext)
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
263
|
Richard Jones <richard@users.sourceforge.net>
parents:
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264 def __repr__(self):
|
Richard Jones <richard@users.sourceforge.net>
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265 return 'defer:%s' % `self._s`
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
266
|
|
1136
|
267 class TraversalError:
|
|
|
268 def __init__(self, path, name):
|
|
|
269 self.path = path
|
|
|
270 self.name = name
|
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271
|
Richard Jones <richard@users.sourceforge.net>
parents:
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272 def restrictedTraverse(self, path, securityManager,
|
Richard Jones <richard@users.sourceforge.net>
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|
273 get=getattr, has=hasattr, N=None, M=[],
|
Richard Jones <richard@users.sourceforge.net>
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|
274 TupleType=type(()) ):
|
Richard Jones <richard@users.sourceforge.net>
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|
275
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
276 REQUEST = {'path': path}
|
Richard Jones <richard@users.sourceforge.net>
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|
277 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy!
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
278 if not path[0]:
|
Richard Jones <richard@users.sourceforge.net>
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|
279 # If the path starts with an empty string, go to the root first.
|
Richard Jones <richard@users.sourceforge.net>
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|
280 self = self.getPhysicalRoot()
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
281 path.pop(0)
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
282
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
283 path.reverse()
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
284 object = self
|
Richard Jones <richard@users.sourceforge.net>
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|
285 #print 'TRAVERSE', (object, path)
|
|
1101
|
286 done = []
|
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|
287 while path:
|
Richard Jones <richard@users.sourceforge.net>
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|
288 name = path.pop()
|
|
1136
|
289 __traceback_info__ = TraversalError(done, name)
|
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|
290
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
291 if isinstance(name, TupleType):
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
292 object = apply(object, name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
293 continue
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
294
|
|
1079
|
295 # if name[0] == '_':
|
|
|
296 # # Never allowed in a URL.
|
|
|
297 # raise AttributeError, name
|
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|
298
|
Richard Jones <richard@users.sourceforge.net>
parents:
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|
299 # Try an attribute.
|
Richard Jones <richard@users.sourceforge.net>
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|
300 o = get(object, name, M)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
301 # print '...', (object, name, M, o)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
302 if o is M:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
303 # Try an item.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
304 # print '... try an item'
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
305 try:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
306 # XXX maybe in Python 2.2 we can just check whether
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
307 # the object has the attribute "__getitem__"
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
308 # instead of blindly catching exceptions.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
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|
309 o = object[name]
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
310 except AttributeError, exc:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
311 if str(exc).find('__getitem__') >= 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
312 # The object does not support the item interface.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
313 # Try to re-raise the original attribute error.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
314 # XXX I think this only happens with
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
315 # ExtensionClass instances.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
316 get(object, name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
317 raise
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
318 except TypeError, exc:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
319 if str(exc).find('unsubscriptable') >= 0:
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
320 # The object does not support the item interface.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
321 # Try to re-raise the original attribute error.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
322 # XXX This is sooooo ugly.
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
323 get(object, name)
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
324 raise
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
325 #print '... object is now', `o`
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
326 object = o
|
|
1136
|
327 done.append((name, o))
|
1049
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
328
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
329 return object
|
Richard Jones <richard@users.sourceforge.net>
parents:
diff
changeset
|
330
|
