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package TM::Literal;
=pod
=head1 NAME
TM::Literal - Topic Maps, simple values (literals)
=head2 SYNOPSIS
use TM::Literal;
my $l = new TM::Literal (42, 'xsd:integer');
print $l->[0]; # prints 42
print $l->[1]; # prints http://www.w3.org/2001/XMLSchema#integer
$l = new TM::Literal (42); # default is xsd:string
=head1 DESCRIPTION
This packages will eventually handle all literal handling, i.e. not only a way to create and
retrieve information about simple values used inside topic maps, but also all necessary operations
such as I<integer addition>, I<string manipulation>.
This is quite a chore, especially since the data types adopted here are the XML Schema Data Types.
=head2 Constants
XSD http://www.w3.org/2001/XMLSchema#
INTEGER http://www.w3.org/2001/XMLSchema#integer
DECIMAL http://www.w3.org/2001/XMLSchema#decimal
FLOAT http://www.w3.org/2001/XMLSchema#float
DOUBLE http://www.w3.org/2001/XMLSchema#double
STRING http://www.w3.org/2001/XMLSchema#string
URI http://www.w3.org/2001/XMLSchema#anyURI
ANY http://www.w3.org/2001/XMLSchema#anyType
=head2 Grammar
TODO
=head2 Operations
TODO
=cut
use constant XSD => "http://www.w3.org/2001/XMLSchema#";
use constant {
INTEGER => XSD.'integer',
DECIMAL => XSD.'decimal',
FLOAT => XSD.'float',
DOUBLE => XSD.'double',
BOOLEAN => XSD.'boolean',
STRING => XSD.'string',
URI => XSD.'anyURI',
ANY => XSD.'anyType',
};
sub new {
my ($class, $val, $type) = @_;
$type ||= STRING;
$type =~ s/^xsd:/XSD/e;
return bless [ $val, $type ],$class;
}
our $grammar = q{
literal : decimal { $return = new TM::Literal ($item[1], TM::Literal->DECIMAL); }
| integer { $return = new TM::Literal ($item[1], TM::Literal->INTEGER); }
| boolean { $return = new TM::Literal ($item[1], TM::Literal->BOOLEAN); }
| wuri { $return = new TM::Literal ($item[1], TM::Literal->URI); }
| string
# TODO | date
integer : /-?\d+/
decimal : /-?\d+\.\d+/
# TODO: optional .234?)
string : /\"{3}(.*?)\"{3}/s ('^^' iri)(?) { $return = new TM::Literal ($1, $item[2]->[0] || TM::Literal->STRING); }
| /\"([^\n]*?)\"/ ('^^' iri)(?) { $return = new TM::Literal ($1, $item[2]->[0] || TM::Literal->STRING); }
# string : quoted_string
# | triple_quoted_string
#
# quoted_string : '"' /[^\"]*/ '"' { $return = $item[2]; }
#
# triple_quoted_string : '"""' /([^\"]|\"(?!""))*/ '"""' { $return = $item[2]; }
boolean : 'true' | 'false'
wuri : '<' iri '>' { $item[2] }
uri : /(\w+:[^\"\s)\]\>]+)/
iri : /\w[\w\d\+\-\.]+:\/([^\.\s:;]|\.(?!\s)|:(?!\s)|;(?!\s))+/
# | '<' ... '>'
| qname # other implementation has to provide this!
# an option? the official pattern -> perldoc URI
# uri : m|^(?:([^:/?#]+):)?(?://([^/?#]*))?([^?#]*)(?:\?([^#]*))?(?:#(.*))?|;
};
our $comparators = {
( INTEGER ) => sub { return $_[0] == $_[1]; },
( DECIMAL ) => sub { return $_[0] == $_[1]; },
( FLOAT ) => sub { return $_[0] == $_[1]; },
( DOUBLE ) => sub { return $_[0] == $_[1]; },
( STRING ) => sub { return $_[0] eq $_[1]; },
};
our $operators = {
'+' => {
(INTEGER) => {
(INTEGER) => \&op_numeric_add,
},
(DECIMAL) => {
(DECIMAL) => \&op_numeric_add,
},
(FLOAT) => {
(FLOAT) => \&op_numeric_add,
},
(DOUBLE) => {
(DOUBLE) => \&op_numeric_add,
},
},
'-' => {
(INTEGER) => {
(INTEGER) => \&op_numeric_subtract,
},
(DECIMAL) => {
(DECIMAL) => \&op_numeric_subtract,
},
(FLOAT) => {
(FLOAT) => \&op_numeric_subtract,
},
(DOUBLE) => {
(DOUBLE) => \&op_numeric_subtract,
},
},
'*' => {
(INTEGER) => {
(INTEGER) => \&op_numeric_multiply,
},
(DECIMAL) => {
(DECIMAL) => \&op_numeric_multiply,
},
(FLOAT) => {
(FLOAT) => \&op_numeric_multiply,
},
(DOUBLE) => {
(DOUBLE) => \&op_numeric_multiply,
},
},
'div' => {
(INTEGER) => {
(INTEGER) => \&op_numeric_divide,
},
(DECIMAL) => {
(DECIMAL) => \&op_numeric_divide,
},
(FLOAT) => {
(FLOAT) => \&op_numeric_divide,
},
(DOUBLE) => {
(DOUBLE) => \&op_numeric_divide,
},
},
'==' => {
(INTEGER) => {
(INTEGER) => \&cmp_numeric_eq,
},
(DECIMAL) => {
(DECIMAL) => \&cmp_numeric_eq,
},
(FLOAT) => {
(FLOAT) => \&cmp_numeric_eq,
},
(DOUBLE) => {
(DOUBLE) => \&cmp_numeric_eq,
},
},
};
our %OPS = (
'tmql:add_int_int' => \&TM::Literal::op_numeric_add
);
sub _lub {
my $a = shift;
my $b = shift;
if ( $a eq DOUBLE || $b eq DOUBLE) {
return DOUBLE;
} elsif ($a eq FLOAT || $b eq FLOAT) {
return FLOAT;
} elsif ($a eq DECIMAL || $b eq DECIMAL) {
return DECIMAL;
} else {
return INTEGER;
}
}
sub op_numeric_add { # (A, B)
return new TM::Literal ($_[0]->[0] + $_[1]->[0], _lub ($_[0]->[1], $_[1]->[1]));
}
sub op_numeric_subtract { # (A, B)
return new TM::Literal ($_[0]->[0] - $_[1]->[0], _lub ($_[0]->[1], $_[1]->[1]));
}
sub op_numeric_multiply { # (A, B)
return new TM::Literal ($_[0]->[0] * $_[1]->[0], _lub ($_[0]->[1], $_[1]->[1]));
}
sub op_numeric_divide { # (A, B)
return new TM::Literal ($_[0]->[0] / $_[1]->[0],
$_[0]->[1] eq INTEGER && $_[1]->[1] eq INTEGER ?
INTEGER :
DECIMAL);
## @@ needs to be fixed
}
sub op_numeric_integer_divide { # (A, B)
return new TM::Literal (int ($_[0]->[0] / $_[1]->[0]), 'xsd:integer');
}
sub cmp_numeric_eq {
return $_[0]->[0] == $_[1]->[0] && $_[0]->[1] eq $_[1]->[1];
}
=pod
=head1 SEE ALSO
L<TM>
=head1 COPYRIGHT AND LICENSE
Copyright 200[6] by Robert Barta, E<lt>drrho@cpan.orgE<gt>
This library is free software; you can redistribute it and/or modify it under the same terms as Perl
itself.
=cut
our $VERSION = 0.1;
our $REVISION = '$Id: Literal.pm,v 1.10 2006/12/29 09:33:42 rho Exp $';
1;
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