NAME

Perl::ToPerl6::Theme - Construct thematic sets of transformers.

DESCRIPTION

This is a helper class for evaluating theme expressions into sets of Transformer objects. There are no user-serviceable parts here.

INTERFACE SUPPORT

This is considered to be a non-public class. Its interface is subject to change without notice.

METHODS

new( -rule => $rule_expression )

Returns a reference to a new Perl::ToPerl6::Theme object. -rule is a string expression that evaluates to true or false for each Transformer.. See "THEME RULES" for more information.

policy_is_thematic( -policy => $policy )

Given a reference to a Perl::ToPerl6::Transformer object, this method returns evaluates the rule against the themes that are associated with the Transformer. Returns 1 if the Transformer satisfies the rule, 0 otherwise.

rule()

Returns the rule expression that was used to construct this Theme. The rule may have been translated into a normalized expression. See "THEME RULES" for more information.

THEME RULES

A theme rule is a simple boolean expression, where the operands are the names of any of the themes associated with the Perl::ToPerl6::Polices.

Theme names can be combined with logical operators to form arbitrarily complex expressions. Precedence is the same as normal mathematics, but you can use parentheses to enforce precedence as well. Supported operators are:

Operator    Altertative    Example
----------------------------------------------------------------
&&          and            'pbp && core'
||          or             'pbp || (bugs && security)'
!           not            'pbp && ! (portability || complexity)

See "CONFIGURATION" in Perl::ToPerl6 for more information about customizing the themes for each Transformer.

SUBROUTINES

cook_rule( $rule )

Standardize a rule into a almost executable Perl code. The "almost" comes from the fact that theme names are left as is.

CONSTANTS

$RULE_INVALID_CHARACTER_REGEX

A regular expression that will return the first character in the matched expression that is not valid in a rule.

AUTHOR

Jeffrey Ryan Thalhammer <jeff@imaginative-software.com>

COPYRIGHT

Copyright (c) 2006-2011 Imaginative Software Systems

This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. The full text of this license can be found in the LICENSE file included with this module.