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Man Pages


Manual Reference Pages  -  MOOSEX::ROLE::MATCHER (3)

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NAME

MooseX::Role::Matcher - generic object matching based on attributes and methods

CONTENTS

VERSION

version 0.05

SYNOPSIS



  package Person;
  use Moose;
  with MooseX::Role::Matcher => { default_match => name };

  has name  => (is => ro, isa => Str);
  has age   => (is => ro, isa => Num);
  has phone => (is => ro, isa => Str);

  package main;
  my @people = (
      Person->new(name => James, age => 22, phone => 555-1914),
      Person->new(name => Jesse, age => 22, phone => 555-6287),
      Person->new(name => Eric,  age => 21, phone => 555-7634),
  );

  # is James 22?
  $people[0]->match(age => 22);

  # which people are not 22?
  my @not_twenty_two = Person->grep_matches([@people], !age => 22);

  # do any of the 22-year-olds have a phone number ending in 4?
  Person->any_match([@people], age => 22, phone => qr/4$/);

  # does everyones name start with either J or E?
  Person->all_match([@people], name => [qr/^J/, qr/^E/]);

  # find the first person whose name is 4 characters long (using the
  # default_match of name)
  my $four = Person->first_match([@people], sub { length == 4 });



DESCRIPTION

This role adds flexible matching and searching capabilities to your Moose class. It provides a match method, which tests attributes and methods of your object against strings, regexes, or coderefs, and also provides several class methods for using match on lists of objects.

PARAMETERS

MooseX::Role::Matcher is a parameterized role (see MooseX::Role::Parameterized). The parameters it takes are:
default_match Which attribute/method to test against by default, if none are specified explicitly. Setting default_match to ’foo’ allows using $obj->match(bar) rather than $obj->match(foo => bar).
allow_missing_methods If set to true, matching against a method that doesn’t exist is treated as though matching against undef. Otherwise, the match call dies.

METHODS

    first_match



  my $four = Person->first_match([@people], sub { length == 4 });



Class method which takes an arrayref of objects in the class that consumed this role, and calls match on each object in the arrayref, passing it the remaining arguments, and returns the first object for which match returns true.

    grep_matches



  my @not_twenty_two = Person->grep_matches([@people], !age => 22);



Class method which takes an arrayref of objects in the class that consumed this role, and calls match on each object in the arrayref, passing it the remaining arguments, and returns the each object for which match returns true.

    any_match



  Person->any_match([@people], age => 22, number => qr/4$/);



Class method which takes an arrayref of objects in the class that consumed this role, and calls match on each object in the arrayref, passing it the remaining arguments, and returns true if any match calls return true, otherwise returns false.

    all_match



  Person->all_match([@people], name => [qr/^J/, qr/^E/]);



Class method which takes an arrayref of objects in the class that consumed this role, and calls match on each object in the arrayref, passing it the remaining arguments, and returns false if any match calls return false, otherwise returns true.

    match



  $person->match(age => 22);



This method provides the majority of the functionality of this role. It accepts a hash of arguments, with keys being the methods (usually attributes) of the object to be tested, and values being things to test against them. Possible types of values are:
SCALAR Returns true if the result of the method is equal to (eq) the value of the scalar, otherwise returns false.
REGEXP Returns true if the result of the method matches the regexp, otherwise returns false.
CODEREF Calls the coderef with $_ set to the result of the method, returning true if the coderef returns true, and false otherwise.
UNDEF Returns true if the method returns undef, or if the object doesn’t have a method by this name, otherwise returns false.
ARRAYREF Matches the result of the method against each element in the arrayref as described above, returning true if any of the submatches return true, and false otherwise.
HASHREF If the method does not return an object which does MooseX::Role::Matcher, returns false. Otherwise, returns the result of calling match on the returned object, with the contents of the hashref as arguments.
Method names can also be given with a leading ’!’, which inverts that test. The first key can be omitted from the argument list if it is the method name passed to the default_match parameter when composing this role.

AUTHOR



  Jesse Luehrs <doy at tozt dot net>



COPYRIGHT AND LICENSE

This software is copyright (c) 2008-2009 by Jesse Luehrs.

This is free software; you can redistribute it and/or modify it under the same terms as perl itself.

TODO

Better error handling/reporting

SEE ALSO

Moose

MooseX::Role::Parameterized

BUGS

No known bugs.

Please report any bugs through RT: email bug-moosex-role-matcher at rt.cpan.org, or browse to <http://rt.cpan.org/NoAuth/ReportBug.html?Queue=MooseX-Role-Matcher>.

SUPPORT

You can find this documentation for this module with the perldoc command.



    perldoc MooseX::Role::Matcher



You can also look for information at:
o AnnoCPAN: Annotated CPAN documentation

<http://annocpan.org/dist/MooseX-Role-Matcher>

o CPAN Ratings

<http://cpanratings.perl.org/d/MooseX-Role-Matcher>

o RT: CPAN’s request tracker

<http://rt.cpan.org/NoAuth/Bugs.html?Dist=MooseX-Role-Matcher>

o Search CPAN

<http://search.cpan.org/dist/MooseX-Role-Matcher>

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perl v5.20.3 MOOSEX::ROLE::MATCHER (3) 2009-02-04

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