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annotate PageTemplates/TALES.py @ 1028:16498e77e3ff

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allow overiding of the index args roundup/cgi/templating.py
author Richard Jones <richard@users.sourceforge.net>
date Tue, 03 Sep 2002 07:33:01 +0000
parents a3a8ac7b8c40
children
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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
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18 __version__='$Revision: 1.1 $'[11:-2]
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19
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20 import re, sys, ZTUtils
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21 from MultiMapping import MultiMapping
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22
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23 StringType = type('')
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24
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25 NAME_RE = r"[a-zA-Z][a-zA-Z0-9_]*"
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26 _parse_expr = re.compile(r"(%s):" % NAME_RE).match
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27 _valid_name = re.compile('%s$' % NAME_RE).match
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28
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29 class TALESError(Exception):
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30 """Error during TALES expression evaluation"""
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31
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32 class Undefined(TALESError):
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33 '''Exception raised on traversal of an undefined path'''
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34
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35 class RegistrationError(Exception):
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36 '''TALES Type Registration Error'''
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37
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38 class CompilerError(Exception):
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39 '''TALES Compiler Error'''
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40
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41 class Default:
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42 '''Retain Default'''
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43 Default = Default()
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44
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45 _marker = []
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46
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47 class SafeMapping(MultiMapping):
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48 '''Mapping with security declarations and limited method exposure.
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49
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50 Since it subclasses MultiMapping, this class can be used to wrap
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51 one or more mapping objects. Restricted Python code will not be
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52 able to mutate the SafeMapping or the wrapped mappings, but will be
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53 able to read any value.
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54 '''
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55 __allow_access_to_unprotected_subobjects__ = 1
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56 push = pop = None
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57
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58 _push = MultiMapping.push
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59 _pop = MultiMapping.pop
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60
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61 def has_get(self, key, _marker=[]):
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62 v = self.get(key, _marker)
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63 return v is not _marker, v
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64
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65 class Iterator(ZTUtils.Iterator):
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66 def __init__(self, name, seq, context):
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67 ZTUtils.Iterator.__init__(self, seq)
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68 self.name = name
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69 self._context = context
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70
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71 def next(self):
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72 if ZTUtils.Iterator.next(self):
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73 self._context.setLocal(self.name, self.item)
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74 return 1
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75 return 0
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76
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77
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78 class ErrorInfo:
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79 """Information about an exception passed to an on-error handler."""
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80 __allow_access_to_unprotected_subobjects__ = 1
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81
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82 def __init__(self, err, position=(None, None)):
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83 if isinstance(err, Exception):
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84 self.type = err.__class__
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85 self.value = err
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86 else:
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87 self.type = err
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88 self.value = None
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89 self.lineno = position[0]
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90 self.offset = position[1]
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91
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92
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93 class Engine:
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94 '''Expression Engine
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95
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96 An instance of this class keeps a mutable collection of expression
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97 type handlers. It can compile expression strings by delegating to
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98 these handlers. It can provide an expression Context, which is
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99 capable of holding state and evaluating compiled expressions.
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100 '''
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101 Iterator = Iterator
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102
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103 def __init__(self, Iterator=None):
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104 self.types = {}
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105 if Iterator is not None:
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106 self.Iterator = Iterator
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107
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108 def registerType(self, name, handler):
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109 if not _valid_name(name):
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110 raise RegistrationError, 'Invalid Expression type "%s".' % name
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111 types = self.types
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112 if types.has_key(name):
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113 raise RegistrationError, (
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114 'Multiple registrations for Expression type "%s".' %
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115 name)
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116 types[name] = handler
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117
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118 def getTypes(self):
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119 return self.types
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120
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121 def compile(self, expression):
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122 m = _parse_expr(expression)
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123 if m:
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124 type = m.group(1)
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125 expr = expression[m.end():]
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126 else:
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127 type = "standard"
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128 expr = expression
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129 try:
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130 handler = self.types[type]
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131 except KeyError:
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132 raise CompilerError, (
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133 'Unrecognized expression type "%s".' % type)
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134 return handler(type, expr, self)
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135
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136 def getContext(self, contexts=None, **kwcontexts):
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137 if contexts is not None:
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138 if kwcontexts:
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139 kwcontexts.update(contexts)
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140 else:
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141 kwcontexts = contexts
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142 return Context(self, kwcontexts)
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143
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144 def getCompilerError(self):
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145 return CompilerError
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146
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147 class Context:
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148 '''Expression Context
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149
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150 An instance of this class holds context information that it can
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151 use to evaluate compiled expressions.
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152 '''
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153
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154 _context_class = SafeMapping
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155 position = (None, None)
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156 source_file = None
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157
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158 def __init__(self, engine, contexts):
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159 self._engine = engine
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160 self.contexts = contexts
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161 contexts['nothing'] = None
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162 contexts['default'] = Default
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163
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164 self.repeat_vars = rv = {}
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165 # Wrap this, as it is visible to restricted code
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166 contexts['repeat'] = rep = self._context_class(rv)
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167 contexts['loop'] = rep # alias
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168
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169 self.global_vars = gv = contexts.copy()
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170 self.local_vars = lv = {}
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171 self.vars = self._context_class(gv, lv)
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172
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173 # Keep track of what needs to be popped as each scope ends.
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174 self._scope_stack = []
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175
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176 def beginScope(self):
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177 self._scope_stack.append([self.local_vars.copy()])
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178
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179 def endScope(self):
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180 scope = self._scope_stack.pop()
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181 self.local_vars = lv = scope[0]
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182 v = self.vars
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183 v._pop()
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184 v._push(lv)
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185 # Pop repeat variables, if any
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186 i = len(scope) - 1
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187 while i:
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188 name, value = scope[i]
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189 if value is None:
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190 del self.repeat_vars[name]
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191 else:
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192 self.repeat_vars[name] = value
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193 i = i - 1
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194
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195 def setLocal(self, name, value):
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196 self.local_vars[name] = value
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197
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198 def setGlobal(self, name, value):
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199 self.global_vars[name] = value
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200
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201 def setRepeat(self, name, expr):
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202 expr = self.evaluate(expr)
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203 if not expr:
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204 return self._engine.Iterator(name, (), self)
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205 it = self._engine.Iterator(name, expr, self)
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206 old_value = self.repeat_vars.get(name)
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207 self._scope_stack[-1].append((name, old_value))
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208 self.repeat_vars[name] = it
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209 return it
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210
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211 def evaluate(self, expression,
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212 isinstance=isinstance, StringType=StringType):
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213 if isinstance(expression, StringType):
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214 expression = self._engine.compile(expression)
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215 __traceback_supplement__ = (
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216 TALESTracebackSupplement, self, expression)
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217 v = expression(self)
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218 return v
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219
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220 evaluateValue = evaluate
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221
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222 def evaluateBoolean(self, expr):
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223 return not not self.evaluate(expr)
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224
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225 def evaluateText(self, expr, None=None):
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226 text = self.evaluate(expr)
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227 if text is Default or text is None:
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228 return text
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229 return str(text)
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230
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231 def evaluateStructure(self, expr):
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232 return self.evaluate(expr)
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233 evaluateStructure = evaluate
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234
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235 def evaluateMacro(self, expr):
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236 # XXX Should return None or a macro definition
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237 return self.evaluate(expr)
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238 evaluateMacro = evaluate
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239
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240 def createErrorInfo(self, err, position):
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241 return ErrorInfo(err, position)
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242
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243 def getDefault(self):
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244 return Default
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245
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246 def setSourceFile(self, source_file):
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247 self.source_file = source_file
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248
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249 def setPosition(self, position):
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250 self.position = position
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251
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diff changeset
252
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diff changeset
253
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254 class TALESTracebackSupplement:
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diff changeset
255 """Implementation of ITracebackSupplement"""
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diff changeset
256 def __init__(self, context, expression):
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257 self.context = context
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258 self.source_url = context.source_file
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259 self.line = context.position[0]
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Richard Jones <richard@users.sourceforge.net>
parents:
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260 self.column = context.position[1]
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diff changeset
261 self.expression = repr(expression)
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diff changeset
262
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263 def getInfo(self, as_html=0):
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diff changeset
264 import pprint
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diff changeset
265 data = self.context.contexts.copy()
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Richard Jones <richard@users.sourceforge.net>
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diff changeset
266 s = pprint.pformat(data)
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parents:
diff changeset
267 if not as_html:
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diff changeset
268 return ' - Names:\n %s' % string.replace(s, '\n', '\n ')
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diff changeset
269 else:
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diff changeset
270 from cgi import escape
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diff changeset
271 return '<b>Names:</b><pre>%s</pre>' % (escape(s))
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272 return None
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273
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274
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275
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diff changeset
276 class SimpleExpr:
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diff changeset
277 '''Simple example of an expression type handler'''
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278 def __init__(self, name, expr, engine):
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279 self._name = name
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280 self._expr = expr
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281 def __call__(self, econtext):
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282 return self._name, self._expr
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diff changeset
283 def __repr__(self):
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parents:
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284 return '<SimpleExpr %s %s>' % (self._name, `self._expr`)
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parents:
diff changeset
285
Roundup Issue Tracker: http://roundup-tracker.org/