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=head1 NAME |
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Declare::Constraints::Simple::Library::Scalar - Scalar Constraints |
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=cut |
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package Declare::Constraints::Simple::Library::Scalar; |
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use warnings; |
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use strict; |
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use Declare::Constraints::Simple-Library; |
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use Carp::Clan qw(^Declare::Constraints::Simple); |
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=head1 SYNOPSIS |
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# match one of a set of regexes |
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my $some_regexes = Matches(qr/foo/, qr/bar/); |
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# allow only defined values |
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my $is_defined = IsDefined; |
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# between 5 and 50 chars |
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my $five_to_fifty = HasLength(5, 50); |
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# match against a set of values |
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my $command_constraint = IsOneOf(qw(create update delete)); |
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# check for trueness |
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my $is_true = IsTrue; |
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# simple equality |
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my $is_foo = IsEq('foo'); |
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=head1 DESCRIPTION |
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This library contains all constraints to validate scalar values. |
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=head1 CONSTRAINTS |
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=head2 Matches(@regex) |
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my $c = Matches(qr/foo/, qr/bar/); |
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If one of the parameters matches the expression, this is true. |
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=cut |
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constraint 'Matches', |
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sub { |
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my @rx = @_; |
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croak 'Matches needs at least one Regexp as argument' |
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unless @rx; |
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for (@rx) { |
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croak 'Matches only takes Regexps as arguments' |
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unless ref($_) eq 'Regexp'; |
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} |
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return sub { |
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return _false('Undefined Value') unless defined $_[0]; |
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for (@rx) { |
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return _true if $_[0] =~ /$_/; |
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} |
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return _false('Regex does not match'); |
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}; |
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}; |
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=head2 IsDefined() |
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True if the value is defined. |
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=cut |
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constraint 'IsDefined', |
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sub { |
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return sub { |
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return _result((defined($_[0]) ? 1 : 0), 'Undefined Value'); |
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}; |
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}; |
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=head2 HasLength([$min, [$max]]) |
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Is true if the value has a length above C<$min> (which defaults to 1> and, |
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if supplied, under the value of C<$max>. A simple |
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my $c = HasLength; |
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checks if the value has a length of at least 1. |
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=cut |
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constraint 'HasLength', |
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sub { |
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my ($min, $max) = @_; |
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$min = 1 unless defined $min; |
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$max = 0 unless defined $max; |
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return sub { |
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my ($val) = @_; |
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return _false('Undefined Value') unless defined $val; |
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return _false('Value too short') unless $min <= length($val); |
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return _true unless $max; |
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return _result(((length($val) <= $max) ? 1 : 0), |
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'Value too long'); |
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}; |
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}; |
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=head2 IsOneOf(@values) |
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True if one of the C<@values> equals the passed value. C values |
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work with this too, so |
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my $c = IsOneOf(1, 2, undef); |
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will return true on an undefined value. |
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=cut |
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constraint 'IsOneOf', |
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sub { |
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my @vals = @_; |
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return sub { |
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for (@vals) { |
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unless (defined $_) { |
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return _true unless defined $_[0]; |
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next; |
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} |
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next unless defined $_[0]; |
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return _true if $_[0] eq $_; |
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} |
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return _false('No Value matches'); |
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}; |
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}; |
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=head2 IsTrue() |
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True if the value evulates to true in boolean context. |
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=cut |
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constraint 'IsTrue', |
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sub { |
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return sub { $_[0] ? _true : _false('Value evaluates to False') }; |
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}; |
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=head2 IsEq($comparator) |
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Valid if the value is C the C<$comparator>. |
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=cut |
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constraint 'IsEq', |
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sub { |
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my ($compare) = @_; |
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return sub { |
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return _result( |
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($compare eq $_[0]), |
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"'$_[0]' does not equal '$compare'" |
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); |
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}; |
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}; |
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=head1 SEE ALSO |
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L, L |
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=head1 AUTHOR |
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Robert 'phaylon' Sedlacek Cphaylon@dunkelheit.atE> |
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=head1 LICENSE AND COPYRIGHT |
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This module is free software, you can redistribute it and/or modify it |
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under the same terms as perl itself. |
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=cut |
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1; |