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annotate roundup/cgi/TAL/TALParser.py @ 2077:3e0961d6d44d

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Added the "actor" property. Metakit backend not done (still not confident I know how it's supposed to work ;) Currently it will come up as NULL in the RDBMS backends for older items. The *dbm backends will look up the journal. I hope to remedy the former before 0.7's release. Fixed a bunch of migration issues in the rdbms backends while I was at it (index changes for key prop changes) and simplified the class table update code for RDBMSes that have "alter table" in their command set (ie. not sqlite) ... migration from "version 1" to "version 2" still hasn't actually been tested yet though.
author Richard Jones <richard@users.sourceforge.net>
date Mon, 15 Mar 2004 05:50:20 +0000
parents fc52d57c6c3e
children 8c2402a78bb0
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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 ##############################################################################
2005
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14 """Parse XML and compile to TALInterpreter intermediate code.
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15 """
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16 __docformat__ = 'restructuredtext'
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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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