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annotate roundup/cgi/TAL/TALParser.py @ 2002:b046b65e51db

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if you're going to enforce class-level permissions... ...then enforce them at the class level
author Richard Jones <richard@users.sourceforge.net>
date Wed, 11 Feb 2004 00:22:20 +0000
parents b9988e118055
children fc52d57c6c3e
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, 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 """
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15 Parse XML and compile to TALInterpreter intermediate code.
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16 """
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17
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18 import string
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19 from XMLParser import XMLParser
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20 from TALDefs import *
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21 from TALGenerator import TALGenerator
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22
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23 class TALParser(XMLParser):
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24
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25 ordered_attributes = 1
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26
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27 def __init__(self, gen=None): # Override
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28 XMLParser.__init__(self)
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29 if gen is None:
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30 gen = TALGenerator()
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31 self.gen = gen
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32 self.nsStack = []
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33 self.nsDict = {XML_NS: 'xml'}
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34 self.nsNew = []
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35
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36 def getCode(self):
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37 return self.gen.getCode()
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38
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39 def getWarnings(self):
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40 return ()
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41
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42 def StartNamespaceDeclHandler(self, prefix, uri):
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43 self.nsStack.append(self.nsDict.copy())
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44 self.nsDict[uri] = prefix
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45 self.nsNew.append((prefix, uri))
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46
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47 def EndNamespaceDeclHandler(self, prefix):
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48 self.nsDict = self.nsStack.pop()
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49
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50 def StartElementHandler(self, name, attrs):
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51 if self.ordered_attributes:
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52 # attrs is a list of alternating names and values
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53 attrlist = []
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54 for i in range(0, len(attrs), 2):
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55 key = attrs[i]
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56 value = attrs[i+1]
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57 attrlist.append((key, value))
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58 else:
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59 # attrs is a dict of {name: value}
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60 attrlist = attrs.items()
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61 attrlist.sort() # For definiteness
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62 name, attrlist, taldict, metaldict = self.process_ns(name, attrlist)
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63 attrlist = self.xmlnsattrs() + attrlist
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64 self.gen.emitStartElement(name, attrlist, taldict, metaldict)
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65
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66 def process_ns(self, name, attrlist):
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67 taldict = {}
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68 metaldict = {}
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69 fixedattrlist = []
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70 name, namebase, namens = self.fixname(name)
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71 for key, value in attrlist:
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72 key, keybase, keyns = self.fixname(key)
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73 ns = keyns or namens # default to tag namespace
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74 item = key, value
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75 if ns == 'metal':
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76 metaldict[keybase] = value
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77 item = item + ("metal",)
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78 elif ns == 'tal':
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79 taldict[keybase] = value
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80 item = item + ("tal",)
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81 fixedattrlist.append(item)
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82 if namens in ('metal', 'tal'):
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83 taldict['tal tag'] = namens
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84 return name, fixedattrlist, taldict, metaldict
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85
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86 def xmlnsattrs(self):
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87 newlist = []
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88 for prefix, uri in self.nsNew:
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89 if prefix:
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90 key = "xmlns:" + prefix
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91 else:
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92 key = "xmlns"
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93 if uri in (ZOPE_METAL_NS, ZOPE_TAL_NS):
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94 item = (key, uri, "xmlns")
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95 else:
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96 item = (key, uri)
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97 newlist.append(item)
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98 self.nsNew = []
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99 return newlist
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100
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101 def fixname(self, name):
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102 if ' ' in name:
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103 uri, name = string.split(name, ' ')
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104 prefix = self.nsDict[uri]
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105 prefixed = name
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106 if prefix:
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107 prefixed = "%s:%s" % (prefix, name)
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108 ns = 'x'
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109 if uri == ZOPE_TAL_NS:
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110 ns = 'tal'
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111 elif uri == ZOPE_METAL_NS:
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112 ns = 'metal'
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113 return (prefixed, name, ns)
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114 return (name, name, None)
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115
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116 def EndElementHandler(self, name):
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117 name = self.fixname(name)[0]
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118 self.gen.emitEndElement(name)
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119
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120 def DefaultHandler(self, text):
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121 self.gen.emitRawText(text)
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122
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123 def test():
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124 import sys
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125 p = TALParser()
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126 file = "tests/input/test01.xml"
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127 if sys.argv[1:]:
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128 file = sys.argv[1]
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129 p.parseFile(file)
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130 program, macros = p.getCode()
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131 from TALInterpreter import TALInterpreter
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132 from DummyEngine import DummyEngine
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133 engine = DummyEngine(macros)
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134 TALInterpreter(program, macros, engine, sys.stdout, wrap=0)()
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135
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136 if __name__ == "__main__":
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137 test()
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