package PPIx::EditorTools::FindVariableDeclaration;

# ABSTRACT: Finds where a variable was declared using PPI

use 5.008;
use strict;
use warnings;
use Carp;

use base 'PPIx::EditorTools';
use Class::XSAccessor accessors => { 'location' => 'location' };

our $VERSION = '0.18';

=pod

=head1 SYNOPSIS

  # finds declaration of variable at cursor
  my $declaration = PPIx::EditorTools::FindVariableDeclaration->new->find(
    code =>
      "package TestPackage;\nuse strict;\nBEGIN {
	$^W = 1;
}\nmy \$x=1;\n\$x++;"
    line => 5,
    column => 2,
  );
  my $location = $declaration->element->location;

=head1 DESCRIPTION

Finds the location of a variable declaration.

=head1 METHODS

=over 4

=item new()

Constructor. Generally shouldn't be called with any arguments.

=item find( ppi => PPI::Document $ppi, line => $line, column => $column )
=item find( code => Str $code, line => $line, column => $column )

Accepts either a C<PPI::Document> to process or a string containing
the code (which will be converted into a C<PPI::Document>) to process.
Searches for the variable declaration and returns a
C<PPIx::EditorTools::ReturnObject> with the declaration
(C<PPI::Statement::Variable>) available via the C<element> accessor.

Croaks with a "no token" exception if no token is found at the location.
Croaks with a "no declaration" exception if unable to find the declaration.

=back

=cut

sub find {
	my ( $self, %args ) = @_;
	$self->process_doc(%args);
	my $column = $args{column} or croak "column required";
	my $line   = $args{line}   or croak "line required";
	my $location = [ $line, $column ];

	my $ppi = $self->ppi;
	$ppi->flush_locations;

	my $token = PPIx::EditorTools::find_token_at_location( $ppi, $location );
	croak "no token" unless $token;

	my $declaration = PPIx::EditorTools::find_variable_declaration($token);
	croak "no declaration" unless $declaration;

	return PPIx::EditorTools::ReturnObject->new(
		ppi     => $ppi,
		element => $declaration,
	);
}

1;

__END__

=head1 SEE ALSO

This class inherits from C<PPIx::EditorTools>.
Also see L<App::EditorTools>, L<Padre>, and L<PPI>.

=cut

# Copyright 2008-2009 The Padre development team as listed in Padre.pm.
# LICENSE
# This program is free software; you can redistribute it and/or
# modify it under the same terms as Perl 5 itself.
