Workflow::Condition::Evaluate - Inline condition that evaluates perl code for truth
This documentation describes version 1.02 of this package
<state name="foo"> <action name="foo action"> <condition test="$context->{foo} =~ /^Pita chips$/" />
If you've got a simple test you can use Perl code inline instead of specifying a condition class. We differentiate by the 'test' attribute -- if it's present we assume it's Perl code to be evaluated.
While it's easy to abuse something like this with:
<condition> <test><![CDATA[ if ( $context->{foo} =~ /^Pita (chips|snacks|bread)$/" ) { return $context->{bar} eq 'hummus'; } else { ... } ]]> </test> </condition>
It should provide a good balance.
One of the \%params should be 'test', which contains the text to evaluate for truth.
\%params
Evaluate the text passed into the constructor: if the evaluation returns a true value then the condition passes; if it throws an exception or returns a false value, the condition fails.
We use Safe to provide a restricted compartment in which we evaluate the text. This should prevent any sneaky bastards from doing something like:
<state...> <action...> <condition test="system( 'rm -rf /' )" />
The text has access to one variable, for the moment:
A hashref of all the parameters in the Workflow::Context object
Safe - From some quick research this module seems to have been packaged with core Perl 5.004+, and that's sufficiently ancient for me to not worry about people having it. If this is a problem for you shoot me an email.
Copyright (c) 2004 Chris Winters. All rights reserved.
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.
Chris Winters <chris@cwinters.com>
To install Workflow, copy and paste the appropriate command in to your terminal.
cpanm
cpanm Workflow
CPAN shell
perl -MCPAN -e shell install Workflow
For more information on module installation, please visit the detailed CPAN module installation guide.