| 1 | """Simple API for XML (SAX) implementation for Python. |
| 2 | |
| 3 | This module provides an implementation of the SAX 2 interface; |
| 4 | information about the Java version of the interface can be found at |
| 5 | http://www.megginson.com/SAX/. The Python version of the interface is |
| 6 | documented at <...>. |
| 7 | |
| 8 | This package contains the following modules: |
| 9 | |
| 10 | handler -- Base classes and constants which define the SAX 2 API for |
| 11 | the 'client-side' of SAX for Python. |
| 12 | |
| 13 | saxutils -- Implementation of the convenience classes commonly used to |
| 14 | work with SAX. |
| 15 | |
| 16 | xmlreader -- Base classes and constants which define the SAX 2 API for |
| 17 | the parsers used with SAX for Python. |
| 18 | |
| 19 | expatreader -- Driver that allows use of the Expat parser with SAX. |
| 20 | """ |
| 21 | |
| 22 | from xmlreader import InputSource |
| 23 | from handler import ContentHandler, ErrorHandler |
| 24 | from _exceptions import SAXException, SAXNotRecognizedException, \ |
| 25 | SAXParseException, SAXNotSupportedException, \ |
| 26 | SAXReaderNotAvailable |
| 27 | |
| 28 | |
| 29 | def parse(source, handler, errorHandler=ErrorHandler()): |
| 30 | parser = make_parser() |
| 31 | parser.setContentHandler(handler) |
| 32 | parser.setErrorHandler(errorHandler) |
| 33 | parser.parse(source) |
| 34 | |
| 35 | def parseString(string, handler, errorHandler=ErrorHandler()): |
| 36 | try: |
| 37 | from cStringIO import StringIO |
| 38 | except ImportError: |
| 39 | from StringIO import StringIO |
| 40 | |
| 41 | if errorHandler is None: |
| 42 | errorHandler = ErrorHandler() |
| 43 | parser = make_parser() |
| 44 | parser.setContentHandler(handler) |
| 45 | parser.setErrorHandler(errorHandler) |
| 46 | |
| 47 | inpsrc = InputSource() |
| 48 | inpsrc.setByteStream(StringIO(string)) |
| 49 | parser.parse(inpsrc) |
| 50 | |
| 51 | # this is the parser list used by the make_parser function if no |
| 52 | # alternatives are given as parameters to the function |
| 53 | |
| 54 | default_parser_list = ["xml.sax.expatreader"] |
| 55 | |
| 56 | # tell modulefinder that importing sax potentially imports expatreader |
| 57 | _false = 0 |
| 58 | if _false: |
| 59 | import xml.sax.expatreader |
| 60 | |
| 61 | import os, sys |
| 62 | if os.environ.has_key("PY_SAX_PARSER"): |
| 63 | default_parser_list = os.environ["PY_SAX_PARSER"].split(",") |
| 64 | del os |
| 65 | |
| 66 | _key = "python.xml.sax.parser" |
| 67 | if sys.platform[:4] == "java" and sys.registry.containsKey(_key): |
| 68 | default_parser_list = sys.registry.getProperty(_key).split(",") |
| 69 | |
| 70 | |
| 71 | def make_parser(parser_list = []): |
| 72 | """Creates and returns a SAX parser. |
| 73 | |
| 74 | Creates the first parser it is able to instantiate of the ones |
| 75 | given in the list created by doing parser_list + |
| 76 | default_parser_list. The lists must contain the names of Python |
| 77 | modules containing both a SAX parser and a create_parser function.""" |
| 78 | |
| 79 | for parser_name in parser_list + default_parser_list: |
| 80 | try: |
| 81 | return _create_parser(parser_name) |
| 82 | except ImportError,e: |
| 83 | import sys |
| 84 | if sys.modules.has_key(parser_name): |
| 85 | # The parser module was found, but importing it |
| 86 | # failed unexpectedly, pass this exception through |
| 87 | raise |
| 88 | except SAXReaderNotAvailable: |
| 89 | # The parser module detected that it won't work properly, |
| 90 | # so try the next one |
| 91 | pass |
| 92 | |
| 93 | raise SAXReaderNotAvailable("No parsers found", None) |
| 94 | |
| 95 | # --- Internal utility methods used by make_parser |
| 96 | |
| 97 | if sys.platform[ : 4] == "java": |
| 98 | def _create_parser(parser_name): |
| 99 | from org.python.core import imp |
| 100 | drv_module = imp.importName(parser_name, 0, globals()) |
| 101 | return drv_module.create_parser() |
| 102 | |
| 103 | else: |
| 104 | def _create_parser(parser_name): |
| 105 | drv_module = __import__(parser_name,{},{},['create_parser']) |
| 106 | return drv_module.create_parser() |
| 107 | |
| 108 | del sys |