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annotate roundup/cgi/PageTemplates/TALES.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:
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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 """TALES
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14
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15 An implementation of a generic TALES engine
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16
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17 Modified for Roundup 0.5 release:
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18
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19 - changed imports to import from roundup.cgi
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20 """
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21 __docformat__ = 'restructuredtext'
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22
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23 __version__='$Revision: 1.6 $'[11:-2]
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24
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25 import re, sys
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26 from roundup.cgi import ZTUtils
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27 from MultiMapping import MultiMapping
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28
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29 StringType = type('')
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30
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31 NAME_RE = r"[a-zA-Z][a-zA-Z0-9_]*"
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32 _parse_expr = re.compile(r"(%s):" % NAME_RE).match
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33 _valid_name = re.compile('%s$' % NAME_RE).match
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34
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35 class TALESError(Exception):
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36 """Error during TALES expression evaluation"""
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37
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38 class Undefined(TALESError):
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39 '''Exception raised on traversal of an undefined path'''
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40
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41 class RegistrationError(Exception):
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42 '''TALES Type Registration Error'''
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43
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44 class CompilerError(Exception):
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45 '''TALES Compiler Error'''
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46
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47 class Default:
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48 '''Retain Default'''
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49 Default = Default()
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50
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51 _marker = []
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52
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53 class SafeMapping(MultiMapping):
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54 '''Mapping with security declarations and limited method exposure.
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55
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56 Since it subclasses MultiMapping, this class can be used to wrap
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57 one or more mapping objects. Restricted Python code will not be
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58 able to mutate the SafeMapping or the wrapped mappings, but will be
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59 able to read any value.
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60 '''
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61 __allow_access_to_unprotected_subobjects__ = 1
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62 push = pop = None
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63
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64 _push = MultiMapping.push
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65 _pop = MultiMapping.pop
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66
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67 def has_get(self, key, _marker=[]):
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68 v = self.get(key, _marker)
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69 return v is not _marker, v
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70
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71 class Iterator(ZTUtils.Iterator):
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72 def __init__(self, name, seq, context):
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73 ZTUtils.Iterator.__init__(self, seq)
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74 self.name = name
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75 self._context = context
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76
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77 def next(self):
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78 if ZTUtils.Iterator.next(self):
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79 self._context.setLocal(self.name, self.item)
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80 return 1
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81 return 0
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82
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83
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84 class ErrorInfo:
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85 """Information about an exception passed to an on-error handler."""
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86 __allow_access_to_unprotected_subobjects__ = 1
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87
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88 def __init__(self, err, position=(None, None)):
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89 if isinstance(err, Exception):
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90 self.type = err.__class__
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91 self.value = err
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92 else:
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93 self.type = err
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94 self.value = None
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95 self.lineno = position[0]
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96 self.offset = position[1]
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97
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98
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99 class Engine:
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100 '''Expression Engine
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101
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102 An instance of this class keeps a mutable collection of expression
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103 type handlers. It can compile expression strings by delegating to
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104 these handlers. It can provide an expression Context, which is
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105 capable of holding state and evaluating compiled expressions.
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106 '''
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107 Iterator = Iterator
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108
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109 def __init__(self, Iterator=None):
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110 self.types = {}
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111 if Iterator is not None:
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112 self.Iterator = Iterator
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113
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114 def registerType(self, name, handler):
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115 if not _valid_name(name):
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116 raise RegistrationError, 'Invalid Expression type "%s".' % name
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117 types = self.types
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118 if types.has_key(name):
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119 raise RegistrationError, (
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120 'Multiple registrations for Expression type "%s".' %
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121 name)
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122 types[name] = handler
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123
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124 def getTypes(self):
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125 return self.types
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126
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127 def compile(self, expression):
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128 m = _parse_expr(expression)
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129 if m:
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130 type = m.group(1)
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131 expr = expression[m.end():]
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132 else:
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133 type = "standard"
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134 expr = expression
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135 try:
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136 handler = self.types[type]
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137 except KeyError:
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138 raise CompilerError, (
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139 'Unrecognized expression type "%s".' % type)
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140 return handler(type, expr, self)
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141
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142 def getContext(self, contexts=None, **kwcontexts):
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143 if contexts is not None:
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144 if kwcontexts:
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145 kwcontexts.update(contexts)
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146 else:
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147 kwcontexts = contexts
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148 return Context(self, kwcontexts)
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149
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150 def getCompilerError(self):
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151 return CompilerError
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152
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153 class Context:
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154 '''Expression Context
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155
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156 An instance of this class holds context information that it can
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157 use to evaluate compiled expressions.
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158 '''
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159
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160 _context_class = SafeMapping
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161 position = (None, None)
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162 source_file = None
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163
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164 def __init__(self, compiler, contexts):
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165 self._compiler = compiler
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166 self.contexts = contexts
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167 contexts['nothing'] = None
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168 contexts['default'] = Default
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169
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170 self.repeat_vars = rv = {}
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171 # Wrap this, as it is visible to restricted code
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172 contexts['repeat'] = rep = self._context_class(rv)
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173 contexts['loop'] = rep # alias
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174
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175 self.global_vars = gv = contexts.copy()
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176 self.local_vars = lv = {}
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177 self.vars = self._context_class(gv, lv)
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178
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179 # Keep track of what needs to be popped as each scope ends.
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180 self._scope_stack = []
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181
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182 def getCompiler(self):
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183 return self._compiler
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184
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185 def beginScope(self):
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186 self._scope_stack.append([self.local_vars.copy()])
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187
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188 def endScope(self):
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189 scope = self._scope_stack.pop()
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190 self.local_vars = lv = scope[0]
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191 v = self.vars
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192 v._pop()
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193 v._push(lv)
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194 # Pop repeat variables, if any
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195 i = len(scope) - 1
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196 while i:
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197 name, value = scope[i]
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198 if value is None:
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199 del self.repeat_vars[name]
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200 else:
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201 self.repeat_vars[name] = value
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202 i = i - 1
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203
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204 def setLocal(self, name, value):
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205 self.local_vars[name] = value
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206
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207 def setGlobal(self, name, value):
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208 self.global_vars[name] = value
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209
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210 def setRepeat(self, name, expr):
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211 expr = self.evaluate(expr)
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212 if not expr:
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213 return self._compiler.Iterator(name, (), self)
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214 it = self._compiler.Iterator(name, expr, self)
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215 old_value = self.repeat_vars.get(name)
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216 self._scope_stack[-1].append((name, old_value))
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217 self.repeat_vars[name] = it
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218 return it
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219
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220 def evaluate(self, expression,
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221 isinstance=isinstance, StringType=StringType):
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222 if isinstance(expression, StringType):
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223 expression = self._compiler.compile(expression)
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224 __traceback_supplement__ = (
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225 TALESTracebackSupplement, self, expression)
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226 v = expression(self)
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227 return v
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228
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229 evaluateValue = evaluate
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9620f6782cb7 merge Zope Collector #580 fix from ZPT CVS trunk
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230 evaluateBoolean = evaluate
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231
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8dc60d87ab42 Fixed a backlog of bug reports, and worked on python 2.3 compatibility:
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232 def evaluateText(self, expr):
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233 text = self.evaluate(expr)
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234 if text is Default or text is None:
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235 return text
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236 return str(text)
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237
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238 def evaluateStructure(self, expr):
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239 return self.evaluate(expr)
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240 evaluateStructure = evaluate
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241
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242 def evaluateMacro(self, expr):
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243 # XXX Should return None or a macro definition
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244 return self.evaluate(expr)
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245 evaluateMacro = evaluate
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246
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247 def createErrorInfo(self, err, position):
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248 return ErrorInfo(err, position)
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249
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250 def getDefault(self):
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251 return Default
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252
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253 def setSourceFile(self, source_file):
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254 self.source_file = source_file
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255
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256 def setPosition(self, position):
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257 self.position = position
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258
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259
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260
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261 class TALESTracebackSupplement:
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262 """Implementation of ITracebackSupplement"""
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263 def __init__(self, context, expression):
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264 self.context = context
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265 self.source_url = context.source_file
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266 self.line = context.position[0]
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267 self.column = context.position[1]
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268 self.expression = repr(expression)
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269
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270 def getInfo(self, as_html=0):
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271 import pprint
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272 data = self.context.contexts.copy()
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273 s = pprint.pformat(data)
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274 if not as_html:
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275 return ' - Names:\n %s' % string.replace(s, '\n', '\n ')
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276 else:
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277 from cgi import escape
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278 return '<b>Names:</b><pre>%s</pre>' % (escape(s))
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279 return None
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280
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281
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282
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283 class SimpleExpr:
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284 '''Simple example of an expression type handler'''
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285 def __init__(self, name, expr, engine):
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286 self._name = name
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287 self._expr = expr
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288 def __call__(self, econtext):
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289 return self._name, self._expr
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290 def __repr__(self):
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291 return '<SimpleExpr %s %s>' % (self._name, `self._expr`)
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292
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