mirror of https://github.com/python/cpython
95 lines
3.2 KiB
Python
95 lines
3.2 KiB
Python
"""Simple API for XML (SAX) implementation for Python.
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This module provides an implementation of the SAX 2 interface;
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information about the Java version of the interface can be found at
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http://www.megginson.com/SAX/. The Python version of the interface is
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documented at <...>.
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This package contains the following modules:
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handler -- Base classes and constants which define the SAX 2 API for
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the 'client-side' of SAX for Python.
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saxutils -- Implementation of the convenience classes commonly used to
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work with SAX.
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xmlreader -- Base classes and constants which define the SAX 2 API for
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the parsers used with SAX for Python.
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expatreader -- Driver that allows use of the Expat parser with SAX.
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"""
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from .xmlreader import InputSource
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from .handler import ContentHandler, ErrorHandler
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from ._exceptions import SAXException, SAXNotRecognizedException, \
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SAXParseException, SAXNotSupportedException, \
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SAXReaderNotAvailable
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def parse(source, handler, errorHandler=ErrorHandler()):
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parser = make_parser()
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parser.setContentHandler(handler)
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parser.setErrorHandler(errorHandler)
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parser.parse(source)
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def parseString(string, handler, errorHandler=ErrorHandler()):
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import io
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if errorHandler is None:
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errorHandler = ErrorHandler()
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parser = make_parser()
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parser.setContentHandler(handler)
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parser.setErrorHandler(errorHandler)
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inpsrc = InputSource()
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if isinstance(string, str):
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inpsrc.setCharacterStream(io.StringIO(string))
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else:
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inpsrc.setByteStream(io.BytesIO(string))
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parser.parse(inpsrc)
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# this is the parser list used by the make_parser function if no
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# alternatives are given as parameters to the function
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default_parser_list = ["xml.sax.expatreader"]
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# tell modulefinder that importing sax potentially imports expatreader
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_false = 0
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if _false:
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import xml.sax.expatreader
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import os, sys
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if not sys.flags.ignore_environment and "PY_SAX_PARSER" in os.environ:
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default_parser_list = os.environ["PY_SAX_PARSER"].split(",")
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del os, sys
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def make_parser(parser_list=()):
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"""Creates and returns a SAX parser.
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Creates the first parser it is able to instantiate of the ones
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given in the iterable created by chaining parser_list and
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default_parser_list. The iterables must contain the names of Python
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modules containing both a SAX parser and a create_parser function."""
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for parser_name in list(parser_list) + default_parser_list:
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try:
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return _create_parser(parser_name)
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except ImportError:
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import sys
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if parser_name in sys.modules:
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# The parser module was found, but importing it
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# failed unexpectedly, pass this exception through
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raise
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except SAXReaderNotAvailable:
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# The parser module detected that it won't work properly,
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# so try the next one
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pass
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raise SAXReaderNotAvailable("No parsers found", None)
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# --- Internal utility methods used by make_parser
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def _create_parser(parser_name):
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drv_module = __import__(parser_name,{},{},['create_parser'])
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return drv_module.create_parser()
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