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Current File : //usr/share/perl5/vendor_perl/Data/OptList.pm
use strict;
use warnings;
package Data::OptList;
BEGIN {
  $Data::OptList::VERSION = '0.107';
}
# ABSTRACT: parse and validate simple name/value option pairs

use List::Util ();
use Params::Util ();
use Sub::Install 0.921 ();


my %test_for;
BEGIN {
  %test_for = (
    CODE   => \&Params::Util::_CODELIKE,  ## no critic
    HASH   => \&Params::Util::_HASHLIKE,  ## no critic
    ARRAY  => \&Params::Util::_ARRAYLIKE, ## no critic
    SCALAR => \&Params::Util::_SCALAR0,   ## no critic
  );
}

sub __is_a {
  my ($got, $expected) = @_;

  return List::Util::first { __is_a($got, $_) } @$expected if ref $expected;

  return defined (
    exists($test_for{$expected})
    ? $test_for{$expected}->($got)
    : Params::Util::_INSTANCE($got, $expected) ## no critic
  );
}

sub mkopt {
  my ($opt_list) = shift;

  my ($moniker, $require_unique, $must_be); # the old positional args
  my $name_test;

  if (@_ == 1 and Params::Util::_HASHLIKE($_[0])) {
    my $arg = $_[0];
    ($moniker, $require_unique, $must_be, $name_test)
      = @$arg{ qw(moniker require_unique must_be name_test) };
  } else {
    ($moniker, $require_unique, $must_be) = @_;
  }

  $moniker = 'unnamed' unless defined $moniker;

  return [] unless $opt_list;

  $name_test ||= sub { ! ref $_[0] };

  $opt_list = [
    map { $_ => (ref $opt_list->{$_} ? $opt_list->{$_} : ()) } keys %$opt_list
  ] if ref $opt_list eq 'HASH';

  my @return;
  my %seen;

  for (my $i = 0; $i < @$opt_list; $i++) { ## no critic
    my $name = $opt_list->[$i];
    my $value;

    if ($require_unique) {
      Carp::croak "multiple definitions provided for $name" if $seen{$name}++;
    }

    if    ($i == $#$opt_list)               { $value = undef;            }
    elsif (not defined $opt_list->[$i+1])   { $value = undef; $i++       }
    elsif ($name_test->($opt_list->[$i+1])) { $value = undef;            }
    else                                    { $value = $opt_list->[++$i] }

    if ($must_be and defined $value) {
      unless (__is_a($value, $must_be)) {
        my $ref = ref $value;
        Carp::croak "$ref-ref values are not valid in $moniker opt list";
      }
    }

    push @return, [ $name => $value ];
  }

  return \@return;
}


sub mkopt_hash {
  my ($opt_list, $moniker, $must_be) = @_;
  return {} unless $opt_list;

  $opt_list = mkopt($opt_list, $moniker, 1, $must_be);
  my %hash = map { $_->[0] => $_->[1] } @$opt_list;
  return \%hash;
}


BEGIN {
  *import = Sub::Install::exporter {
    exports => [qw(mkopt mkopt_hash)],
  };
}

1;

__END__
=pod

=head1 NAME

Data::OptList - parse and validate simple name/value option pairs

=head1 VERSION

version 0.107

=head1 SYNOPSIS

  use Data::OptList;

  my $options = Data::OptList::mkopt([
    qw(key1 key2 key3 key4),
    key5 => { ... },
    key6 => [ ... ],
    key7 => sub { ... },
    key8 => { ... },
    key8 => [ ... ],
  ]);

...is the same thing, more or less, as:

  my $options = [
    [ key1 => undef,        ],
    [ key2 => undef,        ],
    [ key3 => undef,        ],
    [ key4 => undef,        ],
    [ key5 => { ... },      ],
    [ key6 => [ ... ],      ],
    [ key7 => sub { ... },  ],
    [ key8 => { ... },      ],
    [ key8 => [ ... ],      ],
  ]);

=head1 DESCRIPTION

Hashes are great for storing named data, but if you want more than one entry
for a name, you have to use a list of pairs.  Even then, this is really boring
to write:

  $values = [
    foo => undef,
    bar => undef,
    baz => undef,
    xyz => { ... },
  ];

Just look at all those undefs!  Don't worry, we can get rid of those:

  $values = [
    map { $_ => undef } qw(foo bar baz),
    xyz => { ... },
  ];

Aaaauuugh!  We've saved a little typing, but now it requires thought to read,
and thinking is even worse than typing... and it's got a bug!  It looked right,
didn't it?  Well, the C<< xyz => { ... } >> gets consumed by the map, and we
don't get the data we wanted.

With Data::OptList, you can do this instead:

  $values = Data::OptList::mkopt([
    qw(foo bar baz),
    xyz => { ... },
  ]);

This works by assuming that any defined scalar is a name and any reference
following a name is its value.

=head1 FUNCTIONS

=head2 mkopt

  my $opt_list = Data::OptList::mkopt($input, \%arg);

Valid arguments are:

  moniker        - a word used in errors to describe the opt list; encouraged
  require_unique - if true, no name may appear more than once
  must_be        - types to which opt list values are limited (described below)
  name_test      - a coderef used to test whether a value can be a name
                   (described below, but you probably don't want this)

This produces an array of arrays; the inner arrays are name/value pairs.
Values will be either "undef" or a reference.

Positional parameters may be used for compability with the old C<mkopt>
interface:

  my $opt_list = Data::OptList::mkopt($input, $moniker, $req_uni, $must_be);

Valid values for C<$input>:

 undef    -> []
 hashref  -> [ [ key1 => value1 ] ... ] # non-ref values become undef
 arrayref -> every name followed by a non-name becomes a pair: [ name => ref ]
             every name followed by undef becomes a pair: [ name => undef ]
             otherwise, it becomes [ name => undef ] like so:
             [ "a", "b", [ 1, 2 ] ] -> [ [ a => undef ], [ b => [ 1, 2 ] ] ]

By default, a I<name> is any defined non-reference.  The C<name_test> parameter
can be a code ref that tests whether the argument passed it is a name or not.
This should be used rarely.  Interactions between C<require_unique> and
C<name_test> are not yet particularly elegant, as C<require_unique> just tests
string equality.  B<This may change.>

The C<must_be> parameter is either a scalar or array of scalars; it defines
what kind(s) of refs may be values.  If an invalid value is found, an exception
is thrown.  If no value is passed for this argument, any reference is valid.
If C<must_be> specifies that values must be CODE, HASH, ARRAY, or SCALAR, then
Params::Util is used to check whether the given value can provide that
interface.  Otherwise, it checks that the given value is an object of the kind.

In other words:

  [ qw(SCALAR HASH Object::Known) ]

Means:

  _SCALAR0($value) or _HASH($value) or _INSTANCE($value, 'Object::Known')

=head2 mkopt_hash

  my $opt_hash = Data::OptList::mkopt_hash($input, $moniker, $must_be);

Given valid C<L</mkopt>> input, this routine returns a reference to a hash.  It
will throw an exception if any name has more than one value.

=head1 EXPORTS

Both C<mkopt> and C<mkopt_hash> may be exported on request.

=head1 AUTHOR

Ricardo Signes <rjbs@cpan.org>

=head1 COPYRIGHT AND LICENSE

This software is copyright (c) 2006 by Ricardo Signes.

This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.

=cut
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