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annotate roundup/cgi/PageTemplates/TALES.py @ 2005:fc52d57c6c3e

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documentation cleanup
author Richard Jones <richard@users.sourceforge.net>
date Wed, 11 Feb 2004 23:55:10 +0000
parents 8dc60d87ab42
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
2005
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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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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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