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annotate roundup/cgi/PageTemplates/Expressions.py @ 1065:0f9aa62917bd

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much nicer error messages when there's a templating error
author Richard Jones <richard@users.sourceforge.net>
date Fri, 06 Sep 2002 07:21:31 +0000
parents b9988e118055
children c08b3820edd1
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 __version__='$Revision: 1.2 $'[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
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27 _engine = None
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28 def getEngine():
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29 global _engine
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30 if _engine is None:
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31 from PathIterator import Iterator
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32 _engine = Engine(Iterator)
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33 installHandlers(_engine)
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34 return _engine
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35
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36 def installHandlers(engine):
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37 reg = engine.registerType
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38 pe = PathExpr
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39 for pt in ('standard', 'path', 'exists', 'nocall'):
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40 reg(pt, pe)
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41 reg('string', StringExpr)
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42 reg('python', PythonExpr)
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43 reg('not', NotExpr)
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44 reg('defer', DeferExpr)
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45
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46 from PythonExpr import getSecurityManager, PythonExpr
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47 try:
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48 from zExceptions import Unauthorized
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49 except ImportError:
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50 Unauthorized = "Unauthorized"
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51 def call_with_ns(f, ns, arg=1):
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52 if arg==2:
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53 return f(None, ns)
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54 else:
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55 return f(ns)
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56
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57 class _SecureModuleImporter:
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58 """Simple version of the importer for use with trusted code."""
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59 __allow_access_to_unprotected_subobjects__ = 1
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60 def __getitem__(self, module):
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61 __import__(module)
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62 return sys.modules[module]
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63
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64 Undefs = (Undefined, AttributeError, KeyError,
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65 TypeError, IndexError, Unauthorized)
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66
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67 def render(ob, ns):
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68 """
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69 Calls the object, possibly a document template, or just returns it if
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70 not callable. (From DT_Util.py)
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71 """
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72 if hasattr(ob, '__render_with_namespace__'):
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73 ob = call_with_ns(ob.__render_with_namespace__, ns)
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74 else:
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75 base = ob
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76 if callable(base):
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77 try:
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78 if getattr(base, 'isDocTemp', 0):
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79 ob = call_with_ns(ob, ns, 2)
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80 else:
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81 ob = ob()
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82 except AttributeError, n:
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83 if str(n) != '__call__':
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84 raise
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85 return ob
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86
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87 class SubPathExpr:
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88 def __init__(self, path):
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89 self._path = path = split(strip(path), '/')
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90 self._base = base = path.pop(0)
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91 if not _valid_name(base):
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92 raise CompilerError, 'Invalid variable name "%s"' % base
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93 # Parse path
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94 self._dp = dp = []
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95 for i in range(len(path)):
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96 e = path[i]
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97 if e[:1] == '?' and _valid_name(e[1:]):
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98 dp.append((i, e[1:]))
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99 dp.reverse()
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100
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101 def _eval(self, econtext,
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102 list=list, isinstance=isinstance, StringType=type('')):
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103 vars = econtext.vars
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104 path = self._path
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105 if self._dp:
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106 path = list(path) # Copy!
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107 for i, varname in self._dp:
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108 val = vars[varname]
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109 if isinstance(val, StringType):
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110 path[i] = val
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111 else:
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112 # If the value isn't a string, assume it's a sequence
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113 # of path names.
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114 path[i:i+1] = list(val)
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115 base = self._base
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116 __traceback_info__ = 'sub path expression "%s"'%base
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117 if base == 'CONTEXTS':
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118 ob = econtext.contexts
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119 else:
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120 ob = vars[base]
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121 if isinstance(ob, DeferWrapper):
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122 ob = ob()
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123 if path:
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124 ob = restrictedTraverse(ob, path, getSecurityManager())
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125 return ob
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126
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127 class PathExpr:
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128 def __init__(self, name, expr, engine):
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129 self._s = expr
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130 self._name = name
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131 paths = split(expr, '|')
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132 self._subexprs = []
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133 add = self._subexprs.append
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134 for i in range(len(paths)):
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135 path = lstrip(paths[i])
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136 if _parse_expr(path):
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137 # This part is the start of another expression type,
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138 # so glue it back together and compile it.
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139 add(engine.compile(lstrip(join(paths[i:], '|'))))
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140 break
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141 add(SubPathExpr(path)._eval)
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142
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143 def _exists(self, econtext):
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144 for expr in self._subexprs:
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145 try:
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146 expr(econtext)
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147 except Undefs:
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148 pass
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149 else:
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150 return 1
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151 return 0
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152
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153 def _eval(self, econtext,
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154 isinstance=isinstance, StringType=type(''), render=render):
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155 for expr in self._subexprs[:-1]:
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156 # Try all but the last subexpression, skipping undefined ones.
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157 try:
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158 ob = expr(econtext)
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159 except Undefs:
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160 pass
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161 else:
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162 break
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163 else:
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164 # On the last subexpression allow exceptions through.
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165 ob = self._subexprs[-1](econtext)
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166
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167 if self._name == 'nocall' or isinstance(ob, StringType):
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168 return ob
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169 # Return the rendered object
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170 return render(ob, econtext.vars)
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171
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172 def __call__(self, econtext):
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173 if self._name == 'exists':
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174 return self._exists(econtext)
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175 return self._eval(econtext)
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176
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177 def __str__(self):
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178 return '%s expression %s' % (self._name, `self._s`)
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179
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180 def __repr__(self):
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181 return '%s:%s' % (self._name, `self._s`)
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182
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183
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184 _interp = re.compile(r'\$(%(n)s)|\${(%(n)s(?:/%(n)s)*)}' % {'n': NAME_RE})
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185
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186 class StringExpr:
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187 def __init__(self, name, expr, engine):
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188 self._s = expr
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189 if '%' in expr:
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190 expr = replace(expr, '%', '%%')
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191 self._vars = vars = []
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192 if '$' in expr:
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193 parts = []
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194 for exp in split(expr, '$$'):
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195 if parts: parts.append('$')
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196 m = _interp.search(exp)
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197 while m is not None:
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198 parts.append(exp[:m.start()])
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199 parts.append('%s')
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200 vars.append(PathExpr('path', m.group(1) or m.group(2),
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201 engine))
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202 exp = exp[m.end():]
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203 m = _interp.search(exp)
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204 if '$' in exp:
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205 raise CompilerError, (
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206 '$ must be doubled or followed by a simple path')
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207 parts.append(exp)
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208 expr = join(parts, '')
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209 self._expr = expr
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210
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211 def __call__(self, econtext):
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212 vvals = []
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213 for var in self._vars:
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214 v = var(econtext)
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215 if isinstance(v, Exception):
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216 raise v
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217 vvals.append(v)
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218 return self._expr % tuple(vvals)
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219
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220 def __str__(self):
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221 return 'string expression %s' % `self._s`
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222
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223 def __repr__(self):
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224 return 'string:%s' % `self._s`
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225
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226 class NotExpr:
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227 def __init__(self, name, expr, compiler):
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228 self._s = expr = lstrip(expr)
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229 self._c = compiler.compile(expr)
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230
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231 def __call__(self, econtext):
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232 return not econtext.evaluateBoolean(self._c)
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233
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234 def __repr__(self):
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235 return 'not:%s' % `self._s`
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236
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237 class DeferWrapper:
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238 def __init__(self, expr, econtext):
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239 self._expr = expr
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240 self._econtext = econtext
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241
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242 def __str__(self):
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243 return str(self())
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244
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245 def __call__(self):
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246 return self._expr(self._econtext)
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247
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248 class DeferExpr:
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249 def __init__(self, name, expr, compiler):
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250 self._s = expr = lstrip(expr)
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251 self._c = compiler.compile(expr)
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252
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253 def __call__(self, econtext):
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254 return DeferWrapper(self._c, econtext)
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255
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256 def __repr__(self):
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257 return 'defer:%s' % `self._s`
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258
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259
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260 def restrictedTraverse(self, path, securityManager,
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261 get=getattr, has=hasattr, N=None, M=[],
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262 TupleType=type(()) ):
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263
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264 REQUEST = {'path': path}
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265 REQUEST['TraversalRequestNameStack'] = path = path[:] # Copy!
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266 if not path[0]:
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267 # If the path starts with an empty string, go to the root first.
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268 self = self.getPhysicalRoot()
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269 path.pop(0)
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270
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271 path.reverse()
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272 object = self
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273 #print 'TRAVERSE', (object, path)
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274 while path:
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275 name = path.pop()
1065
0f9aa62917bd much nicer error messages when there's a templating error
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276 __traceback_info__ = 'looking for "%s"'%name
1049
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277
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278 if isinstance(name, TupleType):
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279 object = apply(object, name)
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280 continue
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281
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282 if name[0] == '_':
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283 # Never allowed in a URL.
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284 raise AttributeError, name
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285
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286 # Try an attribute.
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287 o = get(object, name, M)
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288 # print '...', (object, name, M, o)
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289 if o is M:
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290 # Try an item.
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291 # print '... try an item'
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292 try:
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293 # XXX maybe in Python 2.2 we can just check whether
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294 # the object has the attribute "__getitem__"
Richard Jones <richard@users.sourceforge.net>
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295 # instead of blindly catching exceptions.
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296 o = object[name]
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297 except AttributeError, exc:
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298 if str(exc).find('__getitem__') >= 0:
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299 # The object does not support the item interface.
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300 # Try to re-raise the original attribute error.
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301 # XXX I think this only happens with
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302 # ExtensionClass instances.
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303 get(object, name)
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304 raise
Richard Jones <richard@users.sourceforge.net>
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305 except TypeError, exc:
Richard Jones <richard@users.sourceforge.net>
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306 if str(exc).find('unsubscriptable') >= 0:
Richard Jones <richard@users.sourceforge.net>
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307 # The object does not support the item interface.
Richard Jones <richard@users.sourceforge.net>
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308 # Try to re-raise the original attribute error.
Richard Jones <richard@users.sourceforge.net>
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309 # XXX This is sooooo ugly.
Richard Jones <richard@users.sourceforge.net>
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310 get(object, name)
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311 raise
Richard Jones <richard@users.sourceforge.net>
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312 #print '... object is now', `o`
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313 object = o
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314
Richard Jones <richard@users.sourceforge.net>
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315 return object
Richard Jones <richard@users.sourceforge.net>
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316
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