#include "functionunique.h"

#include <bu/hash.h>
#include <bu/plugger.h>
PluginInterface3( pluginFunctionUnique, unique, FunctionUnique, Function,
		"Mike Buland", 0, 1 );

FunctionUnique::FunctionUnique()
{
}

FunctionUnique::~FunctionUnique()
{
}

Bu::String FunctionUnique::getName() const
{
	return "unique";
}

Variable FunctionUnique::call( Variable &input, VarList lParams )
{
	if( lParams.getSize() > 0 )
		throw Bu::ExceptionBase("Unique does not take any parameters.");
	if( input.getType() != Variable::typeList )
		throw Bu::ExceptionBase("unique does not work on non-list types.");

	Bu::Hash<Bu::String, bool> hHas;

	Variable vOut( Variable::typeList );
	for( VarList::iterator i = input.begin(); i; i++ )
	{
		if( (*i).getType() != Variable::typeString )
			continue;

		Bu::String s = (*i).getString();
		
		if( hHas.has( s ) )
			continue;

		hHas.insert( s, true );
		vOut.append( *i );
	}

	return vOut;
}