py27-grako-3.99.9.tgz


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Description

py27-grako - Grammar compiler

Property Value
Distribution NetBSD 7.0
Repository NetBSD i386
Package filename py27-grako-3.99.9.tgz
Package name py27-grako
Package version 3.99.9
Package release -
Package architecture i386
Package type tgz
Category devel python
Homepage https://bitbucket.org/neogeny/grako/
License modified-bsd
Maintainer -
Download size 1.30 MB
Installed size 6.99 MB
Grako (for grammar compiler) is a tool that takes grammars in a variation of
EBNF as input, and outputs memoizing (Packrat) PEG parsers in Python.
Grako can also compile a grammar stored in a string into a Grammar object that
can be used to parse any given input, much like the re module does with
regular expressions.
Grako is different from other PEG parser generators:
* Generated parsers use Python's very efficient exception-handling system to
backtrack. Grako generated parsers simply assert what must be parsed. There
are no complicated if-then-else sequences for decision making or
backtracking. Memoization allows going over the same input sequence several
times in linear time.
* Positive and negative lookaheads, and the cut element (with its cleaning of
the memoization cache) allow for additional, hand-crafted optimizations at
the grammar level.
* Delegation to Python's re module for lexemes allows for (Perl-like) powerful
and efficient lexical analysis.
* The use of Python's context managers considerably reduces the size of the
generated parsers for code clarity, and enhanced CPU-cache hits.
* Include files, rule inheritance, and rule inclusion give Grako grammars
considerable expressive power.
* Automatic generation of Abstract Syntax Trees and Object Models, along with
Model Walkers and Code Generators make analysis and translation approachable.

Alternatives

Package Version Architecture Repository
py27-grako-3.99.9.tgz 3.99.9 amd64 NetBSD
py27-grako - - -

Requires

Name Value
py27-cython >= 0.12.1
py27-setuptools >= 0.8
python27 >= 2.7.1nb2

Download

Type URL
Mirror ftp.netbsd.org
Binary Package py27-grako-3.99.9.tgz
Source Package py27-grako

Install Howto

Install py27-grako tgz package:

# pkg_add py27-grako

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