package Weed::Parse::Concept;
use Weed::Perl;
our $VERSION = '0.011';
use Carp (); $Carp::CarpLevel = 1;
use Weed::Tie::WeakHash;
use Weed::RegularExpressions;
use Weed::Parse::Id qw.RestrictedIds RestrictedId.;
use Weed::Parse::String 'string';
use Weed::Parse::Double 'double';
sub parse {
        my ($string) = @_;
        return unless defined $string;
        my $statement = eval { &conceptStatement( \$string ) };
        #die "Error Parse::Concept: '$string'\n", $@ if $@;
        return $statement;
}
sub conceptStatement {
        my ($string) = @_;
        my $name = &RestrictedId($string);
        if ( defined $name ) {
                my $supertypes;
                if ( $$string =~ m.$_colon_test.gc ) {
                        $supertypes = &RestrictedIds($string);
                        die "No supertypes after ':'" unless @$supertypes;
                }
                else {
                        $supertypes = [];
                        die "Expected ' : '" if $$string =~ m.$_colon.gc;
                }
                if ( $$string =~ m.$_open_brace.gc ) {
                        my $body = &body($string);
                        if ( $$string =~ m.$_close_brace.gc ) {
                                return {
                                        typeName   => $name,
                                        supertypes => $supertypes,
                                        new        => sub { bless {}, $_[0] },
                                        body       => $body,
                                };
                        }
                        else {
                                die "Expected '}'";
                        }
                }
                elsif ( $$string =~ m.$_open_bracket.gc ) {
                        #my $body = &body($string);
                        if ( $$string =~ m.$_close_bracket.gc ) {
                                return {
                                        typeName   => $name,
                                        supertypes => $supertypes,
                                        new        => sub { bless $_[1] || [], $_[0] },
                                        #body       => $body,
                                };
                        }
                        else {
                                die "Expected ']'";
                        }
                }
                elsif ( $$string =~ m.$_open_parenthesis.gc ) {
                        my $value;
                        $value = string($string);
                        $value = double($string) unless defined $value;
                        #$value = Weed::Parse::FieldValue::null( \"$$string" ) unless defined $value;
                        if ( $$string =~ m.$_close_parenthesis.gc ) {
                                return {
                                        typeName   => $name,
                                        supertypes => $supertypes,
                                        new        => sub { bless \$value, $_[0] },
                                        #body     => $body,
                                };
                        }
                        else {
                                die "Expected ')'";
                        }
                }
                return {
                        typeName   => $name,
                        supertypes => $supertypes,
                        new        => sub () { die "Package 'does not have a default value"; },
                        #body     => $body,
                } unless $@;
                #               else {
                #                       die "Expected '{' or '['";
                #               }
        }
        else {
                die "Expected a package name\n";
        }
        return;
}
sub body {
        my ($string) = @_;
        return '' if $$string =~ m.$_close_brace_test.gc;
        return $1 if $$string =~ m.$_ConceptBody.gc;
        die "Expected '{ ... }'";
        #die "Expected '}'";
        return;
}
1;
__END__
#use Data::Validate::URI qw(is_http_uri);
#use URI2::Heuristic qw(uf_urlstr); ???
#use LWP::Simple;