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Declare::Constraints::Simple::Library::Scalar(3pm) User Contributed Perl Documentation Declare::Constraints::Simple::Library::Scalar(3pm)

NAME

Declare::Constraints::Simple::Library::Scalar - Scalar Constraints

SYNOPSIS

  # match one of a set of regexes
  my $some_regexes = Matches(qr/foo/, qr/bar/);
  # allow only defined values
  my $is_defined = IsDefined;
  # between 5 and 50 chars
  my $five_to_fifty = HasLength(5, 50);
  # match against a set of values
  my $command_constraint = IsOneOf(qw(create update delete));
  # check for trueness
  my $is_true = IsTrue;
  # simple equality
  my $is_foo = IsEq('foo');

DESCRIPTION

This library contains all constraints to validate scalar values.

CONSTRAINTS

Matches(@regex)

  my $c = Matches(qr/foo/, qr/bar/);

If one of the parameters matches the expression, this is true.

IsDefined()

True if the value is defined.

HasLength([$min, [$max]])

Is true if the value has a length above $min (which defaults to 1> and, if supplied, under the value of $max. A simple

  my $c = HasLength;

checks if the value has a length of at least 1.

IsOneOf(@values)

True if one of the @values equals the passed value. "undef" values work with this too, so

  my $c = IsOneOf(1, 2, undef);

will return true on an undefined value.

IsTrue()

True if the value evulates to true in boolean context.

IsEq($comparator)

Valid if the value is "eq" the $comparator.

SEE ALSO

Declare::Constraints::Simple, Declare::Constraints::Simple::Library

AUTHOR

Robert 'phaylon' Sedlacek "<phaylon@dunkelheit.at>"

LICENSE AND COPYRIGHT

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

2021-01-09 perl v5.32.0