=head1 NAME

Whatpm::WebIDL - A WebIDL Parser and Conformance Checker

=head1 SYNOPSIS

  use Whatpm::WebIDL;
  
  my $parser = Whatpm::WebIDL::Parser->new;
  my $onerror = sub {
    my %arg = @_;
    warn join "\t",
        $arg{line}, $arg{column}, $arg{level},
        $arg{type}, $arg{text} // '', $arg{value} // '';
  };
  
  my $webidl_doc = $parser->parse_char_string ($webidl_string, $onerror);
  $webidl_doc->check ($onerror);

=head1 DESCRIPTION

The C<Whatpm::WebIDL> module provides a WebIDL parser, as well as a
conformance checker that can be invoked once an IDL fragment has been
parsed.

This is an implementation of W3C Web IDL specification.

=head1 METHODS

The C<Whatpm::WebIDL> package itself provides no functionality.  It
contains various packages including C<Whatpm::WebIDL::Parser>.

=head2 C<Whatpm::WebIDL::Parser>

The C<Whatpm::WebIDL::Parser> package, which is contained in the
C<Whatpm::WebIDL> module, defines a class method and an instance
method:

=over 4

=item I<$parser> = Whatpm::WebIDL::Parser->new;

This class method creates a new instance of the WebIDL parser.

=item I<$webidl_doc> = I<$parser>->parse_char_string (I<$webidl_fragment>, [I<$onerror>]);

This instance method of the I<$parser> method parses a WebIDL fragment
and returns its in-memory representation.

The first argument, I<$webidl_fragment>, is the IDL fragment to be
parsed.  It must be a string of characters (not bytes).

As the second argument, I<$onerror>, a C<CODE> reference may be
specified.  If specified, whenever a parse error is found, or a
warning message is raised, the C<CODE> is invoked with arguments
describing the error. @@ TODO: ref to degtailed description

Note that the W3C WebIDL specification does not define how invalid
WebIDL fragments are parsed.  This parse implements a foward
compatible parsing rule that is similar to the CSS parsing rule; once
a parse error is found, everything until the next C<;> character (or
the end-of-file, if there is no C<;> character) is ignored, taking
pairs of C<{> and C<}> characters into account.  If a fragment
prematurely ends inside a block, then a C<};> sequence that closes the
block is implied.  Any error that does not violate the grammer, e.g.
any reference to an undefined interface, does not stop the parser; to
detect such errors, the C<checker> has to be invoked later.

The returned object, C<$webidl_doc>, is an in-memory representation of
the prased IDL fragment.  It is an instance of the
C<Whatpm::WebIDL::Definitions> class.

=back

=head2 C<Whatpm::WebIDL::Definitions>

An object of the C<Whatpm::WebIDL::Definitions> class represents a
WebIDL fragment (or C<Definitions> production in the WebIDL
specification).

=over 4

=item I<$webidl_doc>->check (I<$onerror>, [I<$levels>]);

This method checks the conformance of the WebIDL objects,
I<$webidl_docs>.

@@ TODO: documentation for I<$onerror> and I<$levels>.

=back

=head1 SEE ALSO

WebIDL Editor's Draft
<http://dev.w3.org/cvsweb/~checkout~/2006/webapi/WebIDL/Overview.html?content-type=text/html;%20charset=utf-8>

C<WebHACC::Language::WebIDL> module, as an example of the usage of
this module
<http://suika.fam.cx/gate/cvs/webroot/gate/2007/html/WebHACC/Language/WebIDL.pm>

=head1 AUTHOR

Wakaba <w@suika.fam.cx>

=head1 LICENSE

Copyright 2008 Wakaba <w@suika.fam.cx>

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

=cut

# $Date: 2008/09/16 14:41:38 $