#include "../config/pathan_config.h"
/*
 * Copyright (c) 2001, DecisionSoft Limited All rights reserved.
 * Please see LICENSE.TXT for more information.
 */

#include <pathan/functions/FunctionLowerCase.hpp>
#include <pathan/ATStringOrDerived.hpp>
#include <pathan/DynamicContext.hpp>
#include <pathan/XPath2Utils.hpp>
#include <pathan/internal/factory/DatatypeFactory.hpp>
#include <xercesc/util/XMLUni.hpp>
#include <xercesc/util/XMLString.hpp>

const XMLCh FunctionLowerCase::name[] = {
XERCES_CPP_NAMESPACE_QUALIFIER chLatin_l, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_o, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_w, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_e, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_r, XERCES_CPP_NAMESPACE_QUALIFIER chDash, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_c, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_a, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_s, XERCES_CPP_NAMESPACE_QUALIFIER chLatin_e, XERCES_CPP_NAMESPACE_QUALIFIER chNull };

/*
 * fn:lower-case($arg as xs:string?) as xs:string
 */

FunctionLowerCase::FunctionLowerCase(const VectorOfDataItems &args, XPath2MemoryManager* memMgr)
  : ConstantFoldingFunction(name,1, 1, "string?", args, memMgr)
{
}

Sequence FunctionLowerCase::collapseTreeInternal(DynamicContext* context, int flags) const
{
	XPath2MemoryManager* memMgr = context->getMemoryManager();

  Sequence arg=getParamNumber(1,context);
  if(arg.isEmpty()) {
    return Sequence(DatatypeFactory::STR2AT::createString(memMgr, XERCES_CPP_NAMESPACE_QUALIFIER XMLUni::fgZeroLenString, context), memMgr);
  }
	const XMLCh *src = ((const ATStringOrDerived*)arg.first())->asString(context);
	const XMLCh* str = XPath2Utils::toLower(src, memMgr);

  return Sequence(DatatypeFactory::STR2AT::createString(memMgr, str, context), memMgr);
}