"""Simple API for XML (SAX) implementation for Python.

This module provides an implementation of the SAX 2 interface;

information about the Java version of the interface can be found at

http://www.megginson.com/SAX/.  The Python version of the interface is

documented at <...>.

This package contains the following modules:

handler -- Base classes and constants which define the SAX 2 API for

           the 'client-side' of SAX for Python.

saxutils -- Implementation of the convenience classes commonly used to

            work with SAX.

xmlreader -- Base classes and constants which define the SAX 2 API for

             the parsers used with SAX for Python.

expatreader -- Driver that allows use of the Expat parser with SAX.

"""

from xmlreader import InputSource

from handler import ContentHandler, ErrorHandler

from _exceptions import SAXException, SAXNotRecognizedException, \

                        SAXParseException, SAXNotSupportedException, \

                        SAXReaderNotAvailable

def parse(source, handler, errorHandler=ErrorHandler()):

    parser = make_parser()

    parser.setContentHandler(handler)

    parser.setErrorHandler(errorHandler)

    parser.parse(source)

def parseString(string, handler, errorHandler=ErrorHandler()):

    try:

        from cStringIO import StringIO

    except ImportError:

        from StringIO import StringIO

    if errorHandler is None:

        errorHandler = ErrorHandler()

    parser = make_parser()

    parser.setContentHandler(handler)

    parser.setErrorHandler(errorHandler)

    inpsrc = InputSource()

    inpsrc.setByteStream(StringIO(string))

    parser.parse(inpsrc)

# this is the parser list used by the make_parser function if no

# alternatives are given as parameters to the function

default_parser_list = ["xml.sax.expatreader"]

# tell modulefinder that importing sax potentially imports expatreader

_false = 0

if _false:

    import xml.sax.expatreader

import os, sys

if os.environ.has_key("PY_SAX_PARSER"):

    default_parser_list = os.environ["PY_SAX_PARSER"].split(",")

del os

_key = "python.xml.sax.parser"

if sys.platform[:4] == "java" and sys.registry.containsKey(_key):

    default_parser_list = sys.registry.getProperty(_key).split(",")

def make_parser(parser_list = []):

    """Creates and returns a SAX parser.

    Creates the first parser it is able to instantiate of the ones

    given in the list created by doing parser_list +

    default_parser_list.  The lists must contain the names of Python

    modules containing both a SAX parser and a create_parser function."""

    for parser_name in parser_list + default_parser_list:

        try:

            return _create_parser(parser_name)

        except ImportError,e:

            import sys

            if parser_name in sys.modules:

                # The parser module was found, but importing it

                # failed unexpectedly, pass this exception through

                raise

        except SAXReaderNotAvailable:

            # The parser module detected that it won't work properly,

            # so try the next one

            pass

    raise SAXReaderNotAvailable("No parsers found", None)

# --- Internal utility methods used by make_parser

if sys.platform[ : 4] == "java":

    def _create_parser(parser_name):

        from org.python.core import imp

        drv_module = imp.importName(parser_name, 0, globals())

        return drv_module.create_parser()

else:

    def _create_parser(parser_name):

        drv_module = __import__(parser_name,{},{},['create_parser'])

        return drv_module.create_parser()

del sys