Metadata-Version: 1.0
Name: parcon
Version: 0.1.24
Summary: A parser/formatter library that's easy to use and that provides informative error messages.
Home-page: http://www.opengroove.org/parcon/
Author: Alexander Boyd
Author-email: alex@opengroove.org
License: UNKNOWN
Description: 
        **Parcon** is a parser library. It can be used for parsing both normal
        text and binary data. It's designed to be easy to use and to provide informative
        error messages.
        
        **Pargen**, which is provided as a submodule of Parcon, is a formatter
        library. It's much the opposite of Parcon: while Parcon is used to parse text
        into various objects, Pargen is used to format objects into text. As an
        example, if you wanted to reimplement Python's json module, you would use
        Parcon to implement json.loads and Pargen to implement json.dumps.
        
        **Static**, which is also provided as a submodule of Parcon, is a static typing
        library and Python object pattern library. It lets you build patterns that
        match Python objects based on their type, their attributes, certain properties
        such as whether or not the object is a sequence, the types that make up the
        object's values if the object is a sequence, and so on.
        
        All of the classes, and most of the functions, in Parcon are comprehensively
        documented. The best place to look for help is in Parcon's module documentation.
        Pargen's classes and functions and Static's classes and functions are also 
        documented, though not quite as well as Parcon's are at present.
        
        Parcon grammars are written as Python expressions, so there's no need to learn
        a separate language for writing grammars or anything like that.
        
        Here's an example of a simple expression evaluator written using Parcon::
        
            from parcon import number, Forward, InfixExpr
            import operator
            expr = Forward()
            term = number[float] | "(" + expr + ")"
            term = InfixExpr(term, [("*", operator.mul), ("/", operator.truediv)])
            term = InfixExpr(term, [("+", operator.add), ("-", operator.sub)])
            expr << term(name="expr")
        
        This expression evaluator can be used thus::
        
            print expr.parse_string("1+2") # prints 3
            print expr.parse_string("1+2+3") # prints 6
            print expr.parse_string("1+2+3+4") # prints 10
            print expr.parse_string("3*4") # prints 12
            print expr.parse_string("5+3*4") # prints 17
            print expr.parse_string("(5+3)*4") # prints 32
            print expr.parse_string("10/4") # prints 2.5
        
        A syntax diagram can then be generated from it like this::
        
            expr.draw_productions_to_png({}, "syntax-expr.png")
        
        which would draw `this image <http://www.opengroove.org/syntax-expr.png>`_ to syntax-expr.png.
        
        More examples can be found on `Parcon's blog <http://blog.parcon.opengroove.org>`_,
        and more information in general can be found at `Parcon's website <http://parcon.opengroove.org>`_.
        But reports should be submitted to `the GitHub issue tracker <https://github.com/javawizard/parcon/issues>`_.
        
        Parcon is currently much more comprehensively documented than Pargen and Static
        are. Improved documentation for Pargen and Static will come soon.
        
Platform: UNKNOWN
Classifier: Programming Language :: Python
Classifier: Programming Language :: Python :: 2.6
Classifier: Programming Language :: Python :: 2.7
Classifier: License :: OSI Approved :: GNU Library or Lesser General Public License (LGPL)
Classifier: Operating System :: OS Independent
Classifier: Development Status :: 4 - Beta
Classifier: Intended Audience :: Developers
Classifier: Topic :: Software Development :: Libraries :: Python Modules
Classifier: Topic :: Text Processing
