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lib/Iterator/Flex/Sequence.pm  view on Meta::CPAN

package Iterator::Flex::Sequence;

# ABSTRACT: Numeric Sequence Iterator Class

use v5.28;
use strict;
use warnings;
use experimental 'signatures', 'postderef';

our $VERSION = '0.34';

use Scalar::Util;
use List::Util;

use parent 'Iterator::Flex::Base';
use Iterator::Flex::Utils qw( STATE :IterAttrs throw_failure );

use namespace::clean;


































sub new ( $class, @args ) {

    my $pars = Ref::Util::is_hashref( $args[-1] ) ? pop @args : {};

    throw_failure( parameter => q{incorrect number of arguments for sequence} )
      if @args < 1 || @args > 3;

    my %state;
    $state{step}  = pop @args if @args == 3;
    $state{end}   = pop @args;
    $state{begin} = pop @args;


    $class->SUPER::new( \%state, $pars );
}

sub construct ( $class, $state ) {

    throw_failure( parameter => "$class: arguments must be numbers\n" )
      unless List::Util::all { Scalar::Util::looks_like_number( $_ ) };

    my ( $begin, $end, $step, $iter, $next, $current, $prev )
      = @{$state}{qw[ begin end step iter next current prev ]};

    my $self;
    my $iterator_state;

    my %params;

    if ( !defined $step ) {

        $begin = 0      unless defined $begin;
        $next  = $begin unless defined $next;

        %params = (
            ( +NEXT ) => sub {
                if ( $next > $end ) {
                    $prev = $current
                      unless $self->is_exhausted;
                    return $current = $self->signal_exhaustion;
                }
                $prev    = $current;
                $current = $next++;
                return $current;
            },
            ( +FREEZE ) => sub {
                return [
                    $class,
                    {
                        begin   => $begin,
                        end     => $end,
                        prev    => $prev,
                        current => $current,
                        next    => $next,
                    },
                ];
            },
        );
    }

    else {

        throw_failure(