/*

 * Licensed to the Apache Software Foundation (ASF) under one or more

 * contributor license agreements.  See the NOTICE file distributed with

 * this work for additional information regarding copyright ownership.

 * The ASF licenses this file to You under the Apache License, Version 2.0

 * (the "License"); you may not use this file except in compliance with

 * the License.  You may obtain a copy of the License at

 * 

 *      http://www.apache.org/licenses/LICENSE-2.0

 * 

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

/*

 * $Id: RegxUtil.hpp 568078 2007-08-21 11:43:25Z amassari $

 */

#if !defined(REGXUTIL_HPP)

#define REGXUTIL_HPP

// ---------------------------------------------------------------------------

//  Includes

// ---------------------------------------------------------------------------

#include <xercesc/util/XMLUniDefs.hpp>

XERCES_CPP_NAMESPACE_BEGIN

class MemoryManager;

class XMLUTIL_EXPORT RegxUtil {

public:

	// -----------------------------------------------------------------------

    //  Constructors and destructors

    // -----------------------------------------------------------------------

	~RegxUtil() {}

	static XMLInt32 composeFromSurrogate(const XMLCh high, const XMLCh low);

	static bool isEOLChar(const XMLCh);

	static bool isWordChar(const XMLCh);

	static bool isLowSurrogate(const XMLCh ch);

	static bool isHighSurrogate(const XMLCh ch);

	static void decomposeToSurrogates(XMLInt32 ch, XMLCh& high, XMLCh& low);

	static XMLCh* decomposeToSurrogates(XMLInt32 ch,

                                        MemoryManager* const manager);

	static XMLCh* stripExtendedComment(const XMLCh* const expression,

                                       MemoryManager* const manager = 0);

private:

	// -----------------------------------------------------------------------

    //  Unimplemented constructors and operators

    // -----------------------------------------------------------------------

    RegxUtil();

};

inline bool RegxUtil::isEOLChar(const XMLCh ch) {

	return (ch == chLF || ch == chCR || ch == chLineSeparator

           || ch == chParagraphSeparator);

}

inline XMLInt32 RegxUtil::composeFromSurrogate(const XMLCh high, const XMLCh low) {

	return 0x10000 + ((high - 0xD800) << 10) + (low - 0xDC00);

}

inline bool RegxUtil::isLowSurrogate(const XMLCh ch) {

	return (ch & 0xFC00) == 0xDC00;

}

inline bool RegxUtil::isHighSurrogate(const XMLCh ch) {

	return (ch & 0xFC00) == 0xD800;

}

inline void RegxUtil::decomposeToSurrogates(XMLInt32 ch, XMLCh& high, XMLCh& low) {

    ch -= 0x10000;

	high = XMLCh((ch >> 10) + 0xD800);

	low = XMLCh((ch & 0x03FF) + 0xDC00);

}

inline bool RegxUtil::isWordChar(const XMLCh ch) {

	if ((ch == chUnderscore)

		|| (ch >= chDigit_0 && ch <= chDigit_9)

		|| (ch >= chLatin_A && ch <= chLatin_Z)

		|| (ch >= chLatin_a && ch <= chLatin_z))

		return true;

	return false;

}

XERCES_CPP_NAMESPACE_END

#endif

/**

  * End of file RegxUtil.hpp

  */