Math::Symbolic::CustomUser Contributed Perl DocumentaMath::Symbolic::Custom(3)NAMEMath::Symbolic::Custom - Aggregate class for tree tests and
transformations
SYNOPSIS
# Extending the class:
package Math::Symbolic::Custom::MyTransformations;
use Math::Symbolic::Custom::Base;
BEGIN {*import = \&Math::Symbolic::Custom::Base::aggregate_import}
our $Aggregate_Export = [qw/apply_transformation1 .../];
sub apply_transformation1 {
# ...
}
# ...
# Using the custom class:
use Math::Symbolic;
use Math::Symbolic::Custom::MyTransformations;
# later...
$tree->apply_transformation1();
$tree->mod_transformation2();
die unless $tree->is_type1();
die unless $tree->test_condition1();
die if $tree->contains_something1();
print $tree->to_latex();
DESCRIPTION
This is an aggregate class for all custom modification, transformation,
testing and output extensions for Math::Symbolic trees. Some default
transformations and tests are implemented in the
Math::Symbolic::Custom::DefaultMods and
Math::Symbolic::Custom::DefaultTests packages, default output routines
in Math::Symbolic::Custom::DefaultDumpers which are automatically
loaded by the Math::Symbolic::Custom class.
Math::Symbolic::Custom imports all constants from
Math::Symbolic::ExportConstants
EXPORT
None by default.
EXTENDING THE MODULE
In order to extend the functionality of Math::Symbolic, you have to go
through the following steps: (also see the synopsis in this document.)
· Choose an appropriate namespace in the Math::Symbolic::Custom::*
hierarchy or if you desparately wish, somewhere else.
· Create a new module (probably using "h2xs -AX MODULENAME") and put
the following lines of code in it:
# To make sure we're cooperating with Math::Symbolic's idea of
# method delegation.
use Math::Symbolic::Custom::Base;
BEGIN {*import = \&Math::Symbolic::Custom::Base::aggregate_import}
our $Aggregate_Export = [
# Put the list of method names to be exported.
/];
· Think well about the naming of your exported methods. Answer the
following questions:
Does the name start with 'is_', 'test_', 'mod_', 'apply_',
'contains_', or 'to_'? If not, find a suitable name that does.
Does the name clash with any of the methods exported by
Math::Symbolic::Custom::DefaultTests,
Math::Symbolic::Custom::DefaultMods, or
Math::Symbolic::Custom::DefaultDumpers? If so, please consider
choosing a different name.
Does the name map to the idea behind the method prefix ('is_',
...)? Only methods starting with one of the prefixes listed above
can be delegated. Any others will never be called. The idea behind
delegating methods with several prefixes is to provide for a
reasonable choice for naming methods. 'is_' and 'contains_' are
meant to be used for accurate tests like "is_constant". 'test_' is
meant for all tests that either make use of heuristics or can't be
fitted into either 'is_' or 'contains_'. The prefixes 'mod_' and
'apply_' are meant for use with methods that modify the
Math::Symbolic tree. Finally, the prefix 'to_' is meant to be used
with conversion and output methods like 'to_latex' or 'to_string'.
(Though as of version 0.122, to_string is implemented in the core
Math::Symbolic modules.)
· Make sure you document exactly what your methods do. Do they modify
the Math::Symbolic tree in-place or do they clone using the new()
constructor and return a copy? Make sure you mention the behaviour
in the docs.
· Consider packaging your extensions as a CPAN distribution to help
others in their development with Math::Symbolic. If you think the
extensions are generic enough to be a worthwhile addition to the
core distribution, try sending your extensions to the
Math::Symbolic developers mailing list instead.
· Load your extension module after loading the Math::Symbolic module.
· Start using your custom enhancements as methods to the
Math::Symbolic trees (any term types).
· Send bug reports and feedback to the Math::Symbolic support mailing
list.
AUTHOR
Please send feedback, bug reports, and support requests to the
Math::Symbolic support mailing list: math-symbolic-support at lists dot
sourceforge dot net. Please consider letting us know how you use
Math::Symbolic. Thank you.
If you're interested in helping with the development or extending the
module's functionality, please contact the developers' mailing list:
math-symbolic-develop at lists dot sourceforge dot net.
List of contributors:
Steffen MA~Xller, symbolic-module at steffen-mueller dot net
Stray Toaster, mwk at users dot sourceforge dot net
Oliver EbenhA~Xh
SEE ALSO
New versions of this module can be found on http://steffen-mueller.net
or CPAN. The module development takes place on Sourceforge at
http://sourceforge.net/projects/math-symbolic/
Math::Symbolic::Custom::Base Math::Symbolic::Custom::DefaultTests
Math::Symbolic::Custom::DefaultMods
Math::Symbolic::Custom::DefaultDumpers
Math::Symbolic
perl v5.14.1 2011-07-26 Math::Symbolic::Custom(3)
