Viewing file:  XPtrPart.py (2.49 KB) -rw-r--r--
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########################################################################
#
# File Name: XPtrPart.py
#
# Docs: http://docs.4suite.org/XPointer/XPtrPart.py.html
#
"""
A Parsed Token that represents a list of XPointers
WWW: http://4suite.org/XPointer e-mail: support@4suite.org
Copyright (c) 2000-2001 Fourthought Inc, USA. All Rights Reserved.
See http://4suite.org/COPYRIGHT for license and copyright information
"""
import re
from Ft.Xml.XPointer import XPtrContext, XPtrException
from Ft.Xml.Lib.XmlString import XmlStrStrip
import XPtrExprParserc as _exprParser
_replacer = re.compile("\^(.)")
def Scheme(name, expr):
scheme = Schemes.get(name, UnknownScheme)
expr = u''.join(expr)
expr = _replacer.sub(lambda match: match.group(1), expr)
return scheme(name, expr)
class XPtrExpr:
def __init__(self, name, expr):
self.expr = _exprParser.new().parse(expr)
def evaluate(self, context):
return self.expr.evaluate(context)
def pprint(self, indent=''):
print indent + str(self)
self.expr.pprint(indent+' ')
def __str__(self):
return '<XPtrExpr at %x: %s>' % (id(self), repr(self))
def __repr__(self):
return 'xpointer(%s)' % repr(self.expr)
class XPtrNsDecl:
def __init__(self, name, decl):
equals = decl.index('=')
if equals == -1:
raise SyntaxError('parse error, expected =')
self.prefix = XmlStrStrip(decl[:equals])
if not self.prefix:
raise SyntaxError('parse error, expected NCName')
self.uri = XmlStrStrip(decl[equals+1:])
if not self.uri:
raise SyntaxError('parse error, expected XPtrNsUri')
def evaluate(self, context):
if self.prefix != 'xml':
context.processorNss[self.prefix] = self.uri
return []
def pprint(self, indent=''):
print indent + str(self)
def __str__(self):
return '<XPtrNsDecl at %x: %s>' % (id(self), repr(self))
def __repr__(self):
return 'xmlns(%s=%s)' % (self.prefix, self.uri)
class UnknownScheme:
def __init__(self, name, expr):
self.name = name
self.expr = expr
def evaluate(self, context):
return []
def pprint(self, indent=''):
print indent + str(self)
def __str__(self):
return '<UnknownScheme at %x: %s>' % (id(self), repr(self))
def __repr__(self):
return '%s(%s)' % (self.name, self.expr)
Schemes = {
'xpointer' : XPtrExpr,
'xmlns' : XPtrNsDecl,
}
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