Viewing file:  __init__.py (3.95 KB) -rw-r--r--
Select action/file-type:
 (+) |  (+) |  (+) | Code (+) | Session (+) |  (+) | SDB (+) |  (+) |  (+) |  (+) |  (+) |  (+) |
########################################################################
# $Header: /var/local/cvsroot/4Suite/Ft/Xml/XPath/__init__.py,v 1.29 2005/04/03 04:14:15 jkloth Exp $
"""
4XPath initialization and principal functions
Copyright 2005 Fourthought, Inc. (USA).
Detailed license and copyright information: http://4suite.org/COPYRIGHT
Project home, documentation, distributions: http://4suite.org/
"""
# From DOM Level 3 XPath
XPATH_NAMESPACE_NODE = NAMESPACE_NODE = 13
FT_EXT_NAMESPACE = 'http://xmlns.4suite.org/ext'
__all__ = [# global constants:
'XPATH_NAMESPACE_NODE', 'NAMESPACE_NODE', 'FT_EXT_NAMESPACE',
# exception classes:
'XPathException', 'CompiletimeException', 'RuntimeException',
# XPath expression parser:
'g_parser', 'parser',
# XPath context API:
'Context', #the module; is this necessary to expose?
# XPath expression processing:
'Compile', 'Evaluate', 'SimpleEvaluate',
# DOM preparation for XPath processing:
'NormalizeNode',
]
# -- XPath exceptions --------------------------------------------------------
from Ft import FtException
class XPathException(FtException):
"""
Base class for exceptions specific to XPath processing
"""
def __init__(self, errorCode, messages, args):
FtException.__init__(self, errorCode, messages, args)
class CompiletimeException(XPathException):
"""
The exception raised when an error is encountered during the
parsing or compilation of an XPath expression.
"""
#errorCodes:
# internal/unexpected errors
INTERNAL = 1
# other expression compile-time errors
SYNTAX = 2
def __init__(self, errorCode, *args):
# import here to avoid circularity
import MessageSource
XPathException.__init__(self, errorCode,
MessageSource.ERROR_COMPILETIME, args)
return
class RuntimeException(XPathException):
"""
The exception raised when an error is encountered during the
parsing or evaluation of an XPath expression.
"""
#errorCodes:
# internal/unexpected errors
INTERNAL = 1
# other expression evaluation (run-time) errors
NO_CONTEXT = 10
UNDEFINED_VARIABLE = 100
UNDEFINED_PREFIX = 101
UNDEFINED_FUNCTION = 102
WRONG_ARGUMENTS = 200
ARGCOUNT_NONE = 201
ARGCOUNT_ATLEAST = 202
ARGCOUNT_EXACT = 203
ARGCOUNT_ATMOST = 204
def __init__(self, errorCode, *args):
# import here to avoid circularity
import MessageSource
XPathException.__init__(self, errorCode,
MessageSource.ERROR_RUNTIME, args)
return
# -- Additional setup --------------------------------------------------------
# This occurs near the end because we want to avoid circular import
# problems when the parser imports the expression token classes.
import XPathParserc as XPathParser
parser = XPathParser
# 2004-09-07 - uogbuji:
# Name module global properly. Leave "parser" alone for now for
# backwards-compat. Name "parser" is deprecated.
# 2004-10-15 - jkloth:
# "parser" is not really a global variable, it is a module alias. The
# aliasing appears here instead of in XPathParser.py as that file takes a
# long time to import and allows the ability of testing both versions by
# importing each separately.
# The name was chosen as lowercase to aid in merging with the PyXML codebase.
# However, the XPath codebase has diverged greatly (Domlette/minidom
# differences) so a new name is acceptible/appropriate, keeping in mind that
# this name refers to a module. I suggest simply "Parser".
g_parser = parser
# -- Core XPath API ----------------------------------------------------------
import Context
from Util import Evaluate, SimpleEvaluate, Compile
#Allow access to the NormalizeNode function
from Util import NormalizeNode
Util.XPathParser = g_parser
Util.Context = Context
|