Parse::Eyapp::TokenGen(3)

NAME
Parse::Eyapp::TokenGen - Support for Using Parse::Eyapp as a Data Generator

INTRODUCTION
For a introduction to data generation using Parse::Eyapp see Parse::Eyapp::datagenerationtut.

METHODS

  set_tokengens
Receives the parser object and the pairs

    token => generator

Sets the generator attribute of the tokens. Though not strictly necessary, the generator is a Test::LectroTest::Generator object.

  set_weights
Receives the parser object and the pairs

    token => weight

Sets the weight attribute of the tokens. The weight is a floating number.

  set_tokenweightsandgenerators
Receives the parser object and the pairs

    token => [weight, generator]

or

    token => weight

and sets the weight and generator attributes of the tokens. An example can be found in "examples/generator/GenSupport.pm":

  $parser->set_tokenweightsandgenerators(
    NUM => [ 2, Int(range=>[0, 9], sized=>0)],
    VAR => [
              0,  # At the beginning, no variables are defined
              Gen {
                return  Elements(keys %st)->generate if keys %st;
                return Int(range=>[0, 9], sized=>0)->generate;
              },
            ],
    VARDEF => [
                2,
                String( length=>[1,2], charset=>"A-NP-Z", size => 100 )
              ],
    '=' => 2, '-' => 1, '+' => 2,
    '*' => 4, '/' => 2, '^' => 0.5,
    ';' => 1, '(' => 1, ')' => 2,
    ''  => 2, 'error' => 0,
  );

  token_weight
Receives the parser object and the token and returns the weight. If an additional weight is provided the weight for the token is set.

  token_generator
Receives the parser object and the token and returns the generator. If an additional generator is provided the generator for the token is set.

  deltaweight
Has the syntax:

  $parser->deltaweight(TOKEN1 => deltaweight1, TOKEN2 => deltaweight2, ...)

increases the weight of the respective token by the associated amount.

  pushdeltaweight
As "deltaweight" but the current weights of the involved tokens are saved in a stack

  popweight
Restores the weights of the tokens that were previously saved with "pushdeltaweight"

SEE ALSO

•   Parse::Eyapp::datagenerationtut

•   Test::LectroTest::Generator by Tom Moertel

•   The Design and Implementation of a Grammar-based Data Generator (1992) by Peter M. Maurer, Software Practice and Experience <http://www.cs.ubc.ca/local/reading/proceedings/spe91-95/spe/./vol22/issue3/spe756pm.pdf>

•   yagg: an easy-to-use generator for structured test inputs by David Coppit and Jiexin Lian. ASE '05: Proceedings of the 20th IEEE/ACM international Conference on Automated software engineering. 2005, pages 356-359.

    •   <http://search.cpan.org/perldoc?yagg::Tutorial>,

    •   <http://www.cs.wm.edu/~coppit/wiki/images/4/4e/yagg_short.pdf>,

    •   <http://www.cs.wm.edu/~coppit/wiki/images/6/69/wm-cs-2005-13.pdf>

•   Writing Randomly by Randall Schwartz. Linux Magazine Column 04 (Sep 1999). <http://www.stonehenge.com/merlyn/LinuxMag/col04.html>

•   Generating Test Data with Enhanced Context Free Grammars by Peter M. Maurer <http://cs.baylor.edu/~maurer/aida/dgl-source/documentation/gen_tst.pdf>

•   Modules as Programs by Brian d Foy <http://www252.pair.com/comdog/mastering_perl/Chapters/18.modulinos.html>

•   How a Script Becomes a Module by Brian d Foy. On Perlmonks: <http://www.perlmonks.org/index.pl?node_id=396759>.

CONTRIBUTORS

•   Hal Finkel <http://www.halssoftware.com/>

•   G. Williams <http://kasei.us/>

•   Thomas L. Shinnick <http://search.cpan.org/~tshinnic/>

•   Frank Leray

AUTHOR
Casiano Rodriguez-Leon (casiano@ull.es)

ACKNOWLEDGMENTS
This work has been supported by CEE (FEDER) and the Spanish Ministry of Educacion y Ciencia through Plan Nacional I+D+I number TIN2005-08818-C04-04 (ULL::OPLINK project <http://www.oplink.ull.es/>). Support from Gobierno de Canarias was through GC02210601 (Grupos Consolidados). The University of La Laguna has also supported my work in many ways and for many years.

A large percentage of code is verbatim taken from Parse::Yapp 1.05. The author of Parse::Yapp is Francois Desarmenien.

I wish to thank Francois Desarmenien for his Parse::Yapp module, to my students at La Laguna and to the Perl Community. Thanks to the people who have contributed to improve the module (see "CONTRIBUTORS" in Parse::Eyapp). Thanks to Larry Wall for giving us Perl. Special thanks to Juana.

LICENCE AND COPYRIGHT
Copyright (c) 2006-2008 Casiano Rodriguez-Leon (casiano@ull.es). All rights reserved.

Parse::Yapp copyright is of Francois Desarmenien, all rights reserved. 1998-2001

These modules are free software; you can redistribute it and/or modify it under the same terms as Perl itself. See perlartistic.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.