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annotate roundup/cgi/PageTemplates/TALES.py @ 1069:b3a2b6d2a142

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author Richard Jones <richard@users.sourceforge.net>
date Fri, 06 Sep 2002 23:04:30 +0000
parents b9988e118055
children c08b3820edd1
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1049
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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 $'[11:-2]
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19
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20 import re, sys
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21 from roundup.cgi import ZTUtils
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22 from MultiMapping import MultiMapping
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23
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24 StringType = type('')
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25
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26 NAME_RE = r"[a-zA-Z][a-zA-Z0-9_]*"
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27 _parse_expr = re.compile(r"(%s):" % NAME_RE).match
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28 _valid_name = re.compile('%s$' % NAME_RE).match
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29
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30 class TALESError(Exception):
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31 """Error during TALES expression evaluation"""
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32
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33 class Undefined(TALESError):
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34 '''Exception raised on traversal of an undefined path'''
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35
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36 class RegistrationError(Exception):
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37 '''TALES Type Registration Error'''
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38
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39 class CompilerError(Exception):
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40 '''TALES Compiler Error'''
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41
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42 class Default:
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43 '''Retain Default'''
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44 Default = Default()
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45
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46 _marker = []
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47
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48 class SafeMapping(MultiMapping):
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49 '''Mapping with security declarations and limited method exposure.
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50
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51 Since it subclasses MultiMapping, this class can be used to wrap
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52 one or more mapping objects. Restricted Python code will not be
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53 able to mutate the SafeMapping or the wrapped mappings, but will be
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54 able to read any value.
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55 '''
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56 __allow_access_to_unprotected_subobjects__ = 1
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57 push = pop = None
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58
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59 _push = MultiMapping.push
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60 _pop = MultiMapping.pop
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61
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62 def has_get(self, key, _marker=[]):
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63 v = self.get(key, _marker)
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64 return v is not _marker, v
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65
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66 class Iterator(ZTUtils.Iterator):
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67 def __init__(self, name, seq, context):
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68 ZTUtils.Iterator.__init__(self, seq)
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69 self.name = name
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70 self._context = context
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71
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72 def next(self):
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73 if ZTUtils.Iterator.next(self):
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74 self._context.setLocal(self.name, self.item)
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75 return 1
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76 return 0
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77
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78
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79 class ErrorInfo:
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80 """Information about an exception passed to an on-error handler."""
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81 __allow_access_to_unprotected_subobjects__ = 1
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82
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83 def __init__(self, err, position=(None, None)):
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84 if isinstance(err, Exception):
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85 self.type = err.__class__
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86 self.value = err
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87 else:
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88 self.type = err
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89 self.value = None
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90 self.lineno = position[0]
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91 self.offset = position[1]
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92
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93
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94 class Engine:
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95 '''Expression Engine
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96
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97 An instance of this class keeps a mutable collection of expression
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98 type handlers. It can compile expression strings by delegating to
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99 these handlers. It can provide an expression Context, which is
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100 capable of holding state and evaluating compiled expressions.
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101 '''
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102 Iterator = Iterator
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103
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104 def __init__(self, Iterator=None):
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105 self.types = {}
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106 if Iterator is not None:
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107 self.Iterator = Iterator
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108
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109 def registerType(self, name, handler):
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110 if not _valid_name(name):
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111 raise RegistrationError, 'Invalid Expression type "%s".' % name
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112 types = self.types
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113 if types.has_key(name):
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114 raise RegistrationError, (
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115 'Multiple registrations for Expression type "%s".' %
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116 name)
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117 types[name] = handler
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118
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119 def getTypes(self):
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120 return self.types
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121
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122 def compile(self, expression):
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123 m = _parse_expr(expression)
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124 if m:
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125 type = m.group(1)
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126 expr = expression[m.end():]
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127 else:
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128 type = "standard"
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129 expr = expression
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130 try:
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131 handler = self.types[type]
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132 except KeyError:
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133 raise CompilerError, (
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134 'Unrecognized expression type "%s".' % type)
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135 return handler(type, expr, self)
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136
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137 def getContext(self, contexts=None, **kwcontexts):
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138 if contexts is not None:
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139 if kwcontexts:
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140 kwcontexts.update(contexts)
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141 else:
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142 kwcontexts = contexts
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143 return Context(self, kwcontexts)
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144
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145 def getCompilerError(self):
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146 return CompilerError
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147
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148 class Context:
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149 '''Expression Context
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150
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151 An instance of this class holds context information that it can
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152 use to evaluate compiled expressions.
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153 '''
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154
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155 _context_class = SafeMapping
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156 position = (None, None)
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157 source_file = None
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158
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159 def __init__(self, engine, contexts):
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160 self._engine = engine
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161 self.contexts = contexts
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162 contexts['nothing'] = None
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163 contexts['default'] = Default
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164
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165 self.repeat_vars = rv = {}
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166 # Wrap this, as it is visible to restricted code
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167 contexts['repeat'] = rep = self._context_class(rv)
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168 contexts['loop'] = rep # alias
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169
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170 self.global_vars = gv = contexts.copy()
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171 self.local_vars = lv = {}
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172 self.vars = self._context_class(gv, lv)
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173
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174 # Keep track of what needs to be popped as each scope ends.
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175 self._scope_stack = []
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176
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177 def beginScope(self):
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178 self._scope_stack.append([self.local_vars.copy()])
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179
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180 def endScope(self):
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181 scope = self._scope_stack.pop()
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182 self.local_vars = lv = scope[0]
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183 v = self.vars
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184 v._pop()
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185 v._push(lv)
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186 # Pop repeat variables, if any
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187 i = len(scope) - 1
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188 while i:
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189 name, value = scope[i]
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190 if value is None:
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191 del self.repeat_vars[name]
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192 else:
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193 self.repeat_vars[name] = value
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194 i = i - 1
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195
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196 def setLocal(self, name, value):
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197 self.local_vars[name] = value
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198
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199 def setGlobal(self, name, value):
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200 self.global_vars[name] = value
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201
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202 def setRepeat(self, name, expr):
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203 expr = self.evaluate(expr)
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204 if not expr:
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205 return self._engine.Iterator(name, (), self)
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206 it = self._engine.Iterator(name, expr, self)
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207 old_value = self.repeat_vars.get(name)
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208 self._scope_stack[-1].append((name, old_value))
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209 self.repeat_vars[name] = it
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210 return it
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211
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212 def evaluate(self, expression,
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213 isinstance=isinstance, StringType=StringType):
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214 if isinstance(expression, StringType):
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215 expression = self._engine.compile(expression)
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216 __traceback_supplement__ = (
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217 TALESTracebackSupplement, self, expression)
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218 v = expression(self)
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219 return v
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220
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221 evaluateValue = evaluate
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222
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223 def evaluateBoolean(self, expr):
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224 return not not self.evaluate(expr)
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225
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226 def evaluateText(self, expr, None=None):
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227 text = self.evaluate(expr)
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228 if text is Default or text is None:
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229 return text
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230 return str(text)
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231
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232 def evaluateStructure(self, expr):
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233 return self.evaluate(expr)
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234 evaluateStructure = evaluate
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235
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236 def evaluateMacro(self, expr):
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237 # XXX Should return None or a macro definition
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238 return self.evaluate(expr)
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239 evaluateMacro = evaluate
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240
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241 def createErrorInfo(self, err, position):
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242 return ErrorInfo(err, position)
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243
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244 def getDefault(self):
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245 return Default
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246
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247 def setSourceFile(self, source_file):
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248 self.source_file = source_file
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249
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250 def setPosition(self, position):
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251 self.position = position
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252
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253
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254
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255 class TALESTracebackSupplement:
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256 """Implementation of ITracebackSupplement"""
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257 def __init__(self, context, expression):
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258 self.context = context
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259 self.source_url = context.source_file
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260 self.line = context.position[0]
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261 self.column = context.position[1]
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262 self.expression = repr(expression)
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263
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264 def getInfo(self, as_html=0):
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265 import pprint
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266 data = self.context.contexts.copy()
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267 s = pprint.pformat(data)
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268 if not as_html:
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269 return ' - Names:\n %s' % string.replace(s, '\n', '\n ')
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270 else:
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271 from cgi import escape
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272 return '<b>Names:</b><pre>%s</pre>' % (escape(s))
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273 return None
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274
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275
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276
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277 class SimpleExpr:
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278 '''Simple example of an expression type handler'''
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279 def __init__(self, name, expr, engine):
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280 self._name = name
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281 self._expr = expr
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282 def __call__(self, econtext):
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283 return self._name, self._expr
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284 def __repr__(self):
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285 return '<SimpleExpr %s %s>' % (self._name, `self._expr`)
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286
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