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annotate roundup/cgi/TAL/DummyEngine.py @ 2467:76ead526113d

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client instances may be used as translation engines. any backend translator may be passed as constructor argument or via setTranslator() method. by default, templating.translationService is used. use this engine to translate client messages.
author Alexander Smishlajev <a1s@users.sourceforge.net>
date Tue, 15 Jun 2004 09:19:49 +0000
parents 8c2402a78bb0
children 792586cc78a4
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2348
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1 ##############################################################################
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2 #
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3 # Copyright (c) 2001, 2002 Zope Corporation and Contributors.
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4 # All Rights Reserved.
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5 #
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6 # This software is subject to the provisions of the Zope Public License,
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7 # Version 2.0 (ZPL). A copy of the ZPL should accompany this distribution.
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8 # THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
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9 # WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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10 # WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
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11 # FOR A PARTICULAR PURPOSE.
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12 #
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13 ##############################################################################
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14 # Modifications for Roundup:
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15 # 1. commented out ITALES references
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16 # 2. implemented ustr as str
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17 """
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18 Dummy TALES engine so that I can test out the TAL implementation.
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19 """
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20
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21 import re
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22 import sys
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23
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24 from TALDefs import NAME_RE, TALESError, ErrorInfo
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25 #from ITALES import ITALESCompiler, ITALESEngine
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26 #from DocumentTemplate.DT_Util import ustr
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27 ustr = str
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28
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29 IDomain = None
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30 if sys.modules.has_key('Zope'):
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31 try:
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32 from Zope.I18n.ITranslationService import ITranslationService
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33 from Zope.I18n.IDomain import IDomain
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34 except ImportError:
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35 pass
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36 if IDomain is None:
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37 # Before 2.7, or not in Zope
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38 class ITranslationService: pass
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39 class IDomain: pass
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40
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41 class _Default:
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42 pass
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43 Default = _Default()
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44
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45 name_match = re.compile(r"(?s)(%s):(.*)\Z" % NAME_RE).match
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46
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47 class CompilerError(Exception):
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48 pass
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49
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50 class DummyEngine:
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51
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52 position = None
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53 source_file = None
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54
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55 #__implements__ = ITALESCompiler, ITALESEngine
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56
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57 def __init__(self, macros=None):
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58 if macros is None:
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59 macros = {}
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60 self.macros = macros
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61 dict = {'nothing': None, 'default': Default}
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62 self.locals = self.globals = dict
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63 self.stack = [dict]
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64 self.translationService = DummyTranslationService()
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65
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66 def getCompilerError(self):
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67 return CompilerError
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68
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69 def getCompiler(self):
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70 return self
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71
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72 def setSourceFile(self, source_file):
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73 self.source_file = source_file
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74
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75 def setPosition(self, position):
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76 self.position = position
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77
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78 def compile(self, expr):
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79 return "$%s$" % expr
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80
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81 def uncompile(self, expression):
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82 assert (expression.startswith("$") and expression.endswith("$"),
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83 expression)
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84 return expression[1:-1]
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85
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86 def beginScope(self):
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87 self.stack.append(self.locals)
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88
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89 def endScope(self):
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90 assert len(self.stack) > 1, "more endScope() than beginScope() calls"
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91 self.locals = self.stack.pop()
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92
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93 def setLocal(self, name, value):
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94 if self.locals is self.stack[-1]:
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95 # Unmerge this scope's locals from previous scope of first set
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96 self.locals = self.locals.copy()
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97 self.locals[name] = value
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98
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99 def setGlobal(self, name, value):
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100 self.globals[name] = value
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101
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102 def evaluate(self, expression):
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103 assert (expression.startswith("$") and expression.endswith("$"),
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104 expression)
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105 expression = expression[1:-1]
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106 m = name_match(expression)
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107 if m:
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108 type, expr = m.group(1, 2)
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109 else:
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110 type = "path"
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111 expr = expression
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112 if type in ("string", "str"):
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113 return expr
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114 if type in ("path", "var", "global", "local"):
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115 return self.evaluatePathOrVar(expr)
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116 if type == "not":
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117 return not self.evaluate(expr)
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118 if type == "exists":
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119 return self.locals.has_key(expr) or self.globals.has_key(expr)
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120 if type == "python":
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121 try:
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122 return eval(expr, self.globals, self.locals)
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123 except:
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124 raise TALESError("evaluation error in %s" % `expr`)
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125 if type == "position":
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126 # Insert the current source file name, line number,
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127 # and column offset.
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128 if self.position:
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129 lineno, offset = self.position
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130 else:
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131 lineno, offset = None, None
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132 return '%s (%s,%s)' % (self.source_file, lineno, offset)
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133 raise TALESError("unrecognized expression: " + `expression`)
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134
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135 def evaluatePathOrVar(self, expr):
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136 expr = expr.strip()
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137 if self.locals.has_key(expr):
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138 return self.locals[expr]
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139 elif self.globals.has_key(expr):
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140 return self.globals[expr]
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141 else:
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142 raise TALESError("unknown variable: %s" % `expr`)
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143
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144 def evaluateValue(self, expr):
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145 return self.evaluate(expr)
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146
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147 def evaluateBoolean(self, expr):
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148 return self.evaluate(expr)
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149
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150 def evaluateText(self, expr):
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151 text = self.evaluate(expr)
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152 if text is not None and text is not Default:
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153 text = ustr(text)
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154 return text
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155
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156 def evaluateStructure(self, expr):
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157 # XXX Should return None or a DOM tree
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158 return self.evaluate(expr)
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159
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160 def evaluateSequence(self, expr):
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161 # XXX Should return a sequence
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162 return self.evaluate(expr)
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163
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164 def evaluateMacro(self, macroName):
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165 assert (macroName.startswith("$") and macroName.endswith("$"),
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166 macroName)
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167 macroName = macroName[1:-1]
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168 file, localName = self.findMacroFile(macroName)
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169 if not file:
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170 # Local macro
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171 macro = self.macros[localName]
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172 else:
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173 # External macro
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174 import driver
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175 program, macros = driver.compilefile(file)
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176 macro = macros.get(localName)
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177 if not macro:
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178 raise TALESError("macro %s not found in file %s" %
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179 (localName, file))
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180 return macro
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181
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182 def findMacroDocument(self, macroName):
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183 file, localName = self.findMacroFile(macroName)
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184 if not file:
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185 return file, localName
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186 import driver
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187 doc = driver.parsefile(file)
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188 return doc, localName
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189
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190 def findMacroFile(self, macroName):
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191 if not macroName:
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192 raise TALESError("empty macro name")
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193 i = macroName.rfind('/')
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194 if i < 0:
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195 # No slash -- must be a locally defined macro
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196 return None, macroName
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197 else:
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198 # Up to last slash is the filename
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199 fileName = macroName[:i]
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200 localName = macroName[i+1:]
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201 return fileName, localName
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202
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203 def setRepeat(self, name, expr):
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204 seq = self.evaluateSequence(expr)
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205 return Iterator(name, seq, self)
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206
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207 def createErrorInfo(self, err, position):
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208 return ErrorInfo(err, position)
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209
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210 def getDefault(self):
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211 return Default
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212
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213 def translate(self, domain, msgid, mapping, default=None):
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214 return self.translationService.translate(domain, msgid, mapping,
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215 default=default)
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216
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217
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218 class Iterator:
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219
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220 # This is not an implementation of a Python iterator. The next()
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221 # method returns true or false to indicate whether another item is
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222 # available; if there is another item, the iterator instance calls
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223 # setLocal() on the evaluation engine passed to the constructor.
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224
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225 def __init__(self, name, seq, engine):
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226 self.name = name
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227 self.seq = seq
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228 self.engine = engine
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229 self.nextIndex = 0
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230
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231 def next(self):
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232 i = self.nextIndex
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233 try:
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234 item = self.seq[i]
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235 except IndexError:
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236 return 0
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237 self.nextIndex = i+1
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diff changeset
238 self.engine.setLocal(self.name, item)
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diff changeset
239 return 1
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240
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241 class DummyDomain:
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242 __implements__ = IDomain
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diff changeset
243
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diff changeset
244 def translate(self, msgid, mapping=None, context=None,
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diff changeset
245 target_language=None, default=None):
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246 # This is a fake translation service which simply uppercases non
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diff changeset
247 # ${name} placeholder text in the message id.
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248 #
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249 # First, transform a string with ${name} placeholders into a list of
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diff changeset
250 # substrings. Then upcase everything but the placeholders, then glue
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diff changeset
251 # things back together.
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diff changeset
252
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253 # simulate an unknown msgid by returning None
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254 if msgid == "don't translate me":
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255 text = default
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256 else:
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257 text = msgid.upper()
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258
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diff changeset
259 def repl(m, mapping=mapping):
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diff changeset
260 return ustr(mapping[m.group(m.lastindex).lower()])
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diff changeset
261 cre = re.compile(r'\$(?:(%s)|\{(%s)\})' % (NAME_RE, NAME_RE))
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parents:
diff changeset
262 return cre.sub(repl, text)
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diff changeset
263
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264 class DummyTranslationService:
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265 __implements__ = ITranslationService
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diff changeset
266
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267 def translate(self, domain, msgid, mapping=None, context=None,
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268 target_language=None, default=None):
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269 return self.getDomain(domain).translate(msgid, mapping, context,
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diff changeset
270 target_language,
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271 default=default)
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diff changeset
272
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273 def getDomain(self, domain):
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diff changeset
274 return DummyDomain()
Roundup Issue Tracker: http://roundup-tracker.org/