##############################################################################
#
# Copyright (c) 2001, 2002 Zope Foundation and Contributors.
# All Rights Reserved.
#
# This software is subject to the provisions of the Zope Public License,
# Version 2.1 (ZPL). A copy of the ZPL should accompany this distribution.
# THIS SOFTWARE IS PROVIDED "AS IS" AND ANY AND ALL EXPRESS OR IMPLIED
# WARRANTIES ARE DISCLAIMED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
# WARRANTIES OF TITLE, MERCHANTABILITY, AGAINST INFRINGEMENT, AND FITNESS
# FOR A PARTICULAR PURPOSE.
#
##############################################################################
"""
Parse XML and compile to :class:`~.TALInterpreter` intermediate code,
using a :class:`~.TALGenerator`.
"""
from zope.tal.taldefs import XML_NS, ZOPE_I18N_NS, ZOPE_METAL_NS, ZOPE_TAL_NS
from zope.tal.talgenerator import TALGenerator
from zope.tal.xmlparser import XMLParser
[docs]class TALParser(XMLParser):
"""
Parser for XML.
After parsing with :meth:`~.XMLParser.parseFile`,
:meth:`~.XMLParser.parseString`, :meth:`~.XMLParser.parseURL` or
:meth:`~.XMLParser.parseStream`, you can call :meth:`getCode` to
retrieve the parsed program and macros.
"""
ordered_attributes = 1
def __init__(self, gen=None, encoding=None): # Override
"""
:keyword TALGenerator gen: The configured (with an expression compiler)
code generator to use. If one is not given, a default will be used.
"""
XMLParser.__init__(self, encoding)
if gen is None:
gen = TALGenerator()
self.gen = gen
self.nsStack = []
self.nsDict = {XML_NS: 'xml'}
self.nsNew = []
[docs] def getCode(self):
"""Return the compiled program and macros after parsing."""
return self.gen.getCode()
def StartNamespaceDeclHandler(self, prefix, uri):
self.nsStack.append(self.nsDict.copy())
self.nsDict[uri] = prefix
self.nsNew.append((prefix, uri))
def EndNamespaceDeclHandler(self, prefix):
self.nsDict = self.nsStack.pop()
def StartElementHandler(self, name, attrs):
if self.ordered_attributes:
# attrs is a list of alternating names and values
attrlist = []
for i in range(0, len(attrs), 2):
key = attrs[i]
value = attrs[i + 1]
attrlist.append((key, value))
else:
# attrs is a dict of {name: value}
attrlist = sorted(attrs.items()) # sort for definiteness
name, attrlist, taldict, metaldict, i18ndict \
= self.process_ns(name, attrlist)
attrlist = self.xmlnsattrs() + attrlist
self.gen.emitStartElement(name, attrlist, taldict, metaldict, i18ndict,
self.getpos())
def process_ns(self, name, attrlist):
taldict = {}
metaldict = {}
i18ndict = {}
fixedattrlist = []
name, namebase, namens = self.fixname(name)
for key, value in attrlist:
key, keybase, keyns = self.fixname(key)
ns = keyns or namens # default to tag namespace
item = key, value
if ns == 'metal':
metaldict[keybase] = value
item = item + ("metal",)
elif ns == 'tal':
taldict[keybase] = value
item = item + ("tal",)
elif ns == 'i18n':
i18ndict[keybase] = value
item = item + ('i18n',)
fixedattrlist.append(item)
if namens in ('metal', 'tal', 'i18n'):
taldict['tal tag'] = namens
return name, fixedattrlist, taldict, metaldict, i18ndict
_namespaces = {
ZOPE_TAL_NS: "tal",
ZOPE_METAL_NS: "metal",
ZOPE_I18N_NS: "i18n",
}
def xmlnsattrs(self):
newlist = []
for prefix, uri in self.nsNew:
if prefix:
key = "xmlns:" + prefix
else:
key = "xmlns"
if uri in self._namespaces:
item = (key, uri, "xmlns")
else:
item = (key, uri)
newlist.append(item)
self.nsNew = []
return newlist
def fixname(self, name):
if ' ' in name:
uri, name = name.split(' ', 1)
prefix = self.nsDict[uri]
prefixed = name
if prefix:
prefixed = "%s:%s" % (prefix, name)
ns = self._namespaces.get(uri, "x")
return (prefixed, name, ns)
return (name, name, None)
def EndElementHandler(self, name):
name = self.fixname(name)[0]
self.gen.emitEndElement(name, position=self.getpos())
def DefaultHandler(self, text):
self.gen.emitRawText(text)
def test():
import sys
p = TALParser()
file = "tests/input/test01.xml"
if sys.argv[1:]:
file = sys.argv[1]
p.parseFile(file)
program, macros = p.getCode()
from zope.tal.talinterpreter import TALInterpreter
from zope.tal.dummyengine import DummyEngine
engine = DummyEngine(macros)
TALInterpreter(program, macros, engine, sys.stdout, wrap=0)()
if __name__ == "__main__":
test()