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=head1 NAME

ABNF::Validator - class to verify strings based on ABNF-grammars

=head1 DESCRIPTION

=head1 METHODS

=cut

use 5.014;

use strict;
use warnings;
use re 'eval';

use Carp;
use Readonly;
use Method::Signatures;
use Data::Dumper;

use Parse::ABNF;

use ABNF::Grammar qw(splitRule $BASIC_RULES);

use base qw(Exporter);

our @EXPORT_OK = qw(Validator);

Readonly my $ARGUMENTS_RULES => "generic_arguments_rule_for_";

Readonly my $CLASS_MAP => {
	Choice => \&_choice,
	Group => \&_group,
	Range => \&_range,
	Reference => \&_reference,
	Repetition => \&_repetition,
	Rule => \&_rule,
	String => \&_string,
	Literal => \&_literal,
	ProseValue => \&_proseValue
};

=pod

=head1 ABNF::Validator->C<new>($grammar)

Creates a new B<ABNF::Validator> object.

$grammar isa B<ABNF::Grammar>.

=cut

method new(ABNF::Grammar $grammar) {

	my $class = ref($self) || $self;

	$self = { _grammar => $grammar };

	bless($self, $class);

	$self->_init();

	return $self;
}

method _init() {
	my $commands = $self->{_grammar}->commands();
	$self->{_commandsPattern} = do {
		my $pattern = join(" | ", @$commands);
		qr/\A (?: $pattern ) \Z/ix;
	};

	$self->{_rules} = _value([
		values($self->{_grammar}->rules()),
		values($BASIC_RULES)
	]);

	$self->{_regexps} = do {
		use Regexp::Grammars;

		my %res = ();
		foreach my $token ( @$commands ) {
			# command
			my $str = "
					#<logfile: /dev/null>

					^ <" . _fixRulename($token) . "> \$

					$self->{_rules}
			";
			$res{$token} = qr{$str }ixs;

			# arguments
			my $value = $self->{_grammar}->rule($token);
			my $name = _fixRulename($ARGUMENTS_RULES . $token);
			my $rule = {class => "Rule", name => $name};
			my $val = (splitRule($value))[-1];

			if ( $value->{value} != $val ) {
				$rule->{value} = $val;
				my $converted = _value($rule);
				$res{$name} = qr{
					^ <$name> $

					$converted

					$self->{_rules}
				}xis;
			}
		}

		\%res;
	};
}

func _value($val, $dent = 0) {

	if ( UNIVERSAL::isa($val, 'ARRAY') ) {
		return join('', map { _value($_ , $dent) } @$val);