/*

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

 */

/*

 *	A regular expression parser

 */

#if !defined(REGXPARSER_HPP)

#define REGXPARSER_HPP

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

//  Includes

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

#include <xercesc/util/RefVectorOf.hpp>

#include <xercesc/util/XMLUniDefs.hpp>

XERCES_CPP_NAMESPACE_BEGIN

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

//  Forward Declaration

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

class Token;

class RangeToken;

class TokenFactory;

class XMLUTIL_EXPORT RegxParser : public XMemory

{

public:

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

    //  Public constant data

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

    // Parse tokens

	enum {

		REGX_T_CHAR                     = 0,

		REGX_T_EOF                      = 1,

		REGX_T_OR                       = 2,

		REGX_T_STAR                     = 3,

		REGX_T_PLUS                     = 4,

		REGX_T_QUESTION                 = 5,

		REGX_T_LPAREN                   = 6,

		REGX_T_RPAREN                   = 7,

		REGX_T_DOT                      = 8,

		REGX_T_LBRACKET                 = 9,

		REGX_T_BACKSOLIDUS              = 10,

		REGX_T_CARET                    = 11,

		REGX_T_DOLLAR                   = 12,

		REGX_T_LPAREN2                  = 13,

		REGX_T_LOOKAHEAD                = 14,

		REGX_T_NEGATIVELOOKAHEAD        = 15,

		REGX_T_LOOKBEHIND               = 16,

		REGX_T_NEGATIVELOOKBEHIND       = 17,

		REGX_T_INDEPENDENT              = 18,

		REGX_T_SET_OPERATIONS           = 19,

		REGX_T_POSIX_CHARCLASS_START    = 20,

		REGX_T_COMMENT                  = 21,

		REGX_T_MODIFIERS                = 22,

		REGX_T_CONDITION                = 23,

		REGX_T_XMLSCHEMA_CC_SUBTRACTION	= 24

	};

	static const unsigned short S_NORMAL;

	static const unsigned short S_INBRACKETS;

	static const unsigned short S_INXBRACKETS;

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

    //  Public Constructors and Destructor

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

	RegxParser(MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

	virtual ~RegxParser();

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

    //  Getter methods

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

    unsigned short getParseContext() const;

    unsigned short getState() const;

    XMLInt32       getCharData() const;

    int            getNoParen() const;

	int            getOffset() const;

	bool           hasBackReferences() const;

    TokenFactory*  getTokenFactory() const;

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

    //  Setter methods

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

	void setParseContext(const unsigned short value);

    void setTokenFactory(TokenFactory* const tokFactory);

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

    //  Public Parsing methods

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

	Token* parse(const XMLCh* const regxStr, const int options);

protected:

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

    //  Protected Helper methods

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

    virtual bool        checkQuestion(const int off);

	virtual XMLInt32    decodeEscaped();

    MemoryManager*      getMemoryManager() const;

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

    //  Protected Parsing/Processing methods

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

	void                processNext();

	Token*              parseRegx(const bool matchingRParen = false);

	virtual Token*      processCaret();

    virtual Token*      processDollar();

	virtual Token*      processLook(const unsigned short tokType);

    virtual Token*      processBacksolidus_A();

    virtual Token*      processBacksolidus_z();

    virtual Token*      processBacksolidus_Z();

    virtual Token*      processBacksolidus_b();

    virtual Token*      processBacksolidus_B();

    virtual Token*      processBacksolidus_lt();

    virtual Token*      processBacksolidus_gt();

    virtual Token*      processBacksolidus_c();

    virtual Token*      processBacksolidus_C();

    virtual Token*      processBacksolidus_i();

    virtual Token*      processBacksolidus_I();

    virtual Token*      processBacksolidus_g();

    virtual Token*      processBacksolidus_X();

    virtual Token*      processBackReference();

	virtual Token*      processStar(Token* const tok);

	virtual Token*      processPlus(Token* const tok);

	virtual Token*      processQuestion(Token* const tok);

    virtual Token*      processParen();

    virtual Token*      processParen2();

    virtual Token*      processCondition();

    virtual Token*      processModifiers();

    virtual Token*      processIndependent();

    virtual RangeToken* parseCharacterClass(const bool useNRange);

    virtual RangeToken* parseSetOperations();

	virtual XMLInt32    processCInCharacterClass(RangeToken* const tok,

                                                 const XMLInt32 ch);

    RangeToken*         processBacksolidus_pP(const XMLInt32 ch);

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

    //  Protected PreCreated RangeToken access methods

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

	virtual Token*      getTokenForShorthand(const XMLInt32 ch);

private:

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

    //  Private parsing/processing methods

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

    Token* parseTerm(const bool matchingRParen = false);

	Token* parseFactor();

	Token* parseAtom();

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

    //  Unimplemented constructors and operators

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

    RegxParser(const RegxParser&);

    RegxParser& operator=(const RegxParser&);

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

    //  Private data types

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

    class ReferencePosition : public XMemory

    {

        public :

            ReferencePosition(const int refNo, const int position);

            int	fReferenceNo;

			int	fPosition;

    };

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

    //  Private Helper methods

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

    bool isSet(const int flag);

	int hexChar(const XMLInt32 ch);

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

    //  Private data members

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

    MemoryManager*                  fMemoryManager;

	bool                            fHasBackReferences;

	int                             fOptions;

	int                             fOffset;

	int                             fNoGroups;

	unsigned short                  fParseContext;

	int                             fStringLen;

	unsigned short                  fState;

	XMLInt32                        fCharData;

	XMLCh*                          fString;

	RefVectorOf<ReferencePosition>* fReferences;

    TokenFactory*                   fTokenFactory;

};

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

//  RegxParser: Getter Methods

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

inline unsigned short RegxParser::getParseContext() const {

    return fParseContext;

}

inline unsigned short RegxParser::getState() const {

	return fState;

}

inline XMLInt32 RegxParser::getCharData() const {

    return fCharData;

}

inline int RegxParser::getNoParen() const {

    return fNoGroups;

}

inline int RegxParser::getOffset() const {

	return fOffset;

}

inline bool RegxParser::hasBackReferences() const {

	return fHasBackReferences;

}

inline TokenFactory* RegxParser::getTokenFactory() const {

    return fTokenFactory;

}

inline MemoryManager* RegxParser::getMemoryManager() const {

    return fMemoryManager;

}

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

//  RegxParser: Setter Methods

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

inline void RegxParser::setParseContext(const unsigned short value) {

	fParseContext = value;

}

inline void RegxParser::setTokenFactory(TokenFactory* const tokFactory) {

    fTokenFactory = tokFactory;

}

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

//  RegxParser: Helper Methods

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

inline bool RegxParser::isSet(const int flag) {

    return (fOptions & flag) == flag;

}

inline int RegxParser::hexChar(const XMLInt32 ch) {

	if (ch < chDigit_0 || ch > chLatin_f)

		return -1;

	if (ch <= chDigit_9)

		return ch - chDigit_0;

	if (ch < chLatin_A)

		return -1;

	if (ch <= chLatin_F)

		return ch - chLatin_A + 10;

	if (ch < chLatin_a)

		return -1;

	return ch - chLatin_a + 10;

}

XERCES_CPP_NAMESPACE_END

#endif

/**

  *	End file RegxParser.hpp

  */