ANN: pyparsing-1.3.1 released

Discussion in 'Python' started by Paul McGuire, Jun 13, 2005.

  1. Paul McGuire

    Paul McGuire Guest

    Pyparsing is a pure-Python class library for quickly and easily
    constructing recursive-descent parsers. Pyparsing takes a
    "building-block" approach to parser construction, as opposed to code
    generation methods (such as lex/yacc) or pattern definition strings
    (such as regular expressions).

    Version 1.3.1 includes some minor enhancements, plus some performance
    improvements that can really improve performance for grammars that use
    the Combine class (often used in specifying floating point numbers).

    The 1.3.1 change notes are listed below. Download pyparsing at
    http://pyparsing.sourceforge.net.

    -- Paul McGuire


    Version 1.3.1 - June 12, 2005
    -----------------------------
    - Added markInputline() method to ParseException, to display the input
    text line location of the parsing exception. (Thanks, Stefan Behnel!)

    - Added setDefaultKeywordChars(), so that Keyword definitions using a
    custom keyword character set do not all need to add the keywordChars
    constructor argument (similar to setDefaultWhitespaceChars()).
    (suggested
    by rzhanka on the SourceForge pyparsing forum.)

    - Simplified passing debug actions to setDebugAction(). You can now
    pass 'None' for a debug action if you want to take the default
    debug behavior. To suppress a particular debug action, you can pass
    the pyparsing method nullDebugAction.

    - Refactored parse exception classes, moved all behavior to
    ParseBaseException, and the former ParseException is now a subclass
    of
    ParseBaseException. Added a second subclass, ParseFatalException, as
    a subclass of ParseBaseException. User-defined parse actions can
    raise
    ParseFatalException if a data inconsistency is detected (such as a
    begin-tag/end-tag mismatch), and this will stop all parsing
    immediately.
    (Inspired by e-mail thread with Michele Petrazzo - thanks, Michelle!)

    - Added helper methods makeXMLTags and makeHTMLTags, that simplify the
    definition of XML or HTML tag parse expressions for a given tagname.

    Both functions return a pair of parse expressions, one for the
    opening
    tag (that is, '<tagname>') and one for the closing tag
    ('</tagname>').
    The opening tagame also recognizes any attribute definitions that
    have
    been included in the opening tag, as well as an empty tag (one with a
    trailing '/', as in '<BODY/>' which is equivalent to
    '<BODY></BODY>').
    makeXMLTags uses stricter XML syntax for attributes, requiring that
    they
    be enclosed in double quote characters - makeHTMLTags is more
    lenient,
    and accepts single-quoted strings or any contiguous string of
    characters
    up to the next whitespace character or '>' character. Attributes can
    be retrieved as dictionary or attribute values of the returned
    results
    from the opening tag.

    - Added example SimpleCalc.py, a refinement on fourFn.py that adds
    an interactive session and support for variables. (Thanks, Steven
    Siew!)

    - Added performance improvement, up to 20% reduction! (Found while
    working
    with Wolfgang Borgert on performance tuning of his TTCN3 parser.)

    - And another performance improvement, up to 25%, when using
    scanString!
    (Found while working with Henrik Westlund on his C header file
    scanner.)

    - Updated UML diagrams to reflect latest class/method changes.
     
    Paul McGuire, Jun 13, 2005
    #1
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