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"""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()):
import io
if errorHandler is None:
errorHandler = ErrorHandler()
parser = make_parser()
parser.setContentHandler(handler)
parser.setErrorHandler(errorHandler)
inpsrc = InputSource()
if isinstance(string, str):
inpsrc.setCharacterStream(io.StringIO(string))
else:
inpsrc.setByteStream(io.BytesIO(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 not sys.flags.ignore_environment and "PY_SAX_PARSER" in os.environ:
default_parser_list = os.environ["PY_SAX_PARSER"].split(",")
del os, sys
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 iterable created by chaining parser_list and
default_parser_list. The iterables must contain the names of Python
modules containing both a SAX parser and a create_parser function."""
for parser_name in list(parser_list) + default_parser_list:
try:
return _create_parser(parser_name)
except ImportError:
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
def _create_parser(parser_name):
drv_module = __import__(parser_name,{},{},['create_parser'])
return drv_module.create_parser()