regularexpression.hpp

基于属性证书的访问控制源代码,由c++编写,包括openssl,xercesc等

/*
 * The Apache Software License, Version 1.1
 *
 * Copyright (c) 2001-2003 The Apache Software Foundation.  All rights
 * reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *       "This product includes software developed by the
 *        Apache Software Foundation (http://www.apache.org/)."
 *    Alternately, this acknowledgment may appear in the software itself,
 *    if and wherever such third-party acknowledgments normally appear.
 *
 * 4. The names "Xerces" and "Apache Software Foundation" must
 *    not be used to endorse or promote products derived from this
 *    software without prior written permission. For written
 *    permission, please contact apache\@apache.org.
 *
 * 5. Products derived from this software may not be called "Apache",
 *    nor may "Apache" appear in their name, without prior written
 *    permission of the Apache Software Foundation.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the Apache Software Foundation, and was
 * originally based on software copyright (c) 2001, International
 * Business Machines, Inc., http://www.ibm.com .  For more information
 * on the Apache Software Foundation, please see
 * <http://www.apache.org/>.
 */

/*
 * $Id: RegularExpression.hpp,v 1.17 2004/01/13 20:05:00 peiyongz Exp $
 */

#if !defined(REGULAREXPRESSION_HPP)
#define REGULAREXPRESSION_HPP

// ---------------------------------------------------------------------------
//  Includes
// ---------------------------------------------------------------------------
#include <xercesc/util/RefArrayVectorOf.hpp>
#include <xercesc/util/XMLString.hpp>
#include <xercesc/util/Janitor.hpp>
#include <xercesc/util/Mutexes.hpp>
#include <xercesc/util/regx/Op.hpp>
#include <xercesc/util/regx/TokenFactory.hpp>
#include <xercesc/util/regx/BMPattern.hpp>
#include <xercesc/util/regx/ModifierToken.hpp>
#include <xercesc/util/regx/ConditionToken.hpp>
#include <xercesc/util/regx/OpFactory.hpp>

XERCES_CPP_NAMESPACE_BEGIN

// ---------------------------------------------------------------------------
//  Forward Declaration
// ---------------------------------------------------------------------------
class RangeToken;
class Match;

class XMLUTIL_EXPORT RegularExpression : public XMemory
{
public:
    // -----------------------------------------------------------------------
    //  Public Constructors and Destructor
    // -----------------------------------------------------------------------
    RegularExpression
    (
        const char* const pattern
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
    RegularExpression
    (
        const char* const pattern
        , const char* const options
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
    RegularExpression
    (
        const XMLCh* const pattern
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
    RegularExpression
    (
        const XMLCh* const pattern
        , const XMLCh* const options
        , MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager
    );
    ~RegularExpression();

    // -----------------------------------------------------------------------
    //  Public Constants
    // -----------------------------------------------------------------------
    static const unsigned int   MARK_PARENS;
    static const unsigned int   IGNORE_CASE;
    static const unsigned int   SINGLE_LINE;
    static const unsigned int   MULTIPLE_LINE;
    static const unsigned int   EXTENDED_COMMENT;
    static const unsigned int   USE_UNICODE_CATEGORY;
    static const unsigned int   UNICODE_WORD_BOUNDARY;
    static const unsigned int   PROHIBIT_HEAD_CHARACTER_OPTIMIZATION;
    static const unsigned int   PROHIBIT_FIXED_STRING_OPTIMIZATION;
    static const unsigned int   XMLSCHEMA_MODE;
    static const unsigned int   SPECIAL_COMMA;
    static const unsigned short WT_IGNORE;
    static const unsigned short WT_LETTER;
    static const unsigned short WT_OTHER;

    // -----------------------------------------------------------------------
    //  Public Helper methods
    // -----------------------------------------------------------------------
    static int getOptionValue(const XMLCh ch);

    // -----------------------------------------------------------------------
    //  Matching methods
    // -----------------------------------------------------------------------
    bool matches(const char* const matchString, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const char* const matchString, const int start,
                 const int end, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const char* const matchString, Match* const pMatch, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const char* const matchString, const int start,
                 const int end, Match* const pMatch, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    bool matches(const XMLCh* const matchString, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const XMLCh* const matchString, const int start,
                 const int end, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const XMLCh* const matchString, Match* const pMatch, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
    bool matches(const XMLCh* const matchString, const int start,
                 const int end, Match* const pMatch, MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);

    // -----------------------------------------------------------------------
    //  Tokenize methods
    // -----------------------------------------------------------------------
    // Note: The caller owns the string vector that is returned, and is responsible
    //       for deleting it.
    RefArrayVectorOf<XMLCh> *tokenize(const char* const matchString);
    RefArrayVectorOf<XMLCh> *tokenize(const char* const matchString, const int start,
                                      const int end);

    RefArrayVectorOf<XMLCh> *tokenize(const XMLCh* const matchString);
    RefArrayVectorOf<XMLCh> *tokenize(const XMLCh* const matchString,
                                      const int start, const int end);

    // -----------------------------------------------------------------------
    //  Replace methods
    // -----------------------------------------------------------------------
    // Note: The caller owns the XMLCh* that is returned, and is responsible for
    //       deleting it.
    XMLCh *replace(const char* const matchString, const char* const replaceString);
    XMLCh *replace(const char* const matchString, const char* const replaceString,
                   const int start, const int end);

    XMLCh *replace(const XMLCh* const matchString, const XMLCh* const replaceString);
    XMLCh *replace(const XMLCh* const matchString, const XMLCh* const replaceString,
                   const int start, const int end);

private:
    // -----------------------------------------------------------------------
    //  Private data types
    // -----------------------------------------------------------------------
    class XMLUTIL_EXPORT Context : public XMemory
    {
        public :
            Context(MemoryManager* const manager = XMLPlatformUtils::fgMemoryManager);
            ~Context();

            inline const XMLCh* getString() const { return fString; }
            void reset(const XMLCh* const string, const int stringLen,
                       const int start, const int limit, const int noClosures);
            bool nextCh(XMLInt32& ch, int& offset, const short direction);
            
            bool      fAdoptMatch;
            int       fStart;
            int       fLimit;
            int       fLength;    // fLimit - fStart
            int       fSize;
            int       fStringMaxLen;
            int*      fOffsets;
            Match*    fMatch;
            XMLCh*    fString;
            MemoryManager* fMemoryManager;

            friend class Janitor<Context>;
    };

    // -----------------------------------------------------------------------
    //  Unimplemented constructors and operators
    // -----------------------------------------------------------------------
    RegularExpression(const RegularExpression&);
    RegularExpression& operator=(const RegularExpression&);

    // -----------------------------------------------------------------------
    //  Cleanup methods
    // -----------------------------------------------------------------------
    void cleanUp();

    // -----------------------------------------------------------------------
    //  Setter methods
    // -----------------------------------------------------------------------
    void setPattern(const XMLCh* const pattern, const XMLCh* const options=0);

    // -----------------------------------------------------------------------
    //  Private Helper methods
    // -----------------------------------------------------------------------
    void prepare();
    int parseOptions(const XMLCh* const options);
    bool isSet(const int options, const int flag);
    unsigned short getWordType(const XMLCh* const target, const int begin,
                               const int end, const int offset);
    unsigned short getCharType(const XMLCh ch);
    unsigned short getPreviousWordType(const XMLCh* const target,
                                       const int start, const int end,
                                       int offset);

    /**
      *    Matching helpers
      */
    int match(Context* const context, const Op* const operations, int offset,
              const short direction);
    bool matchIgnoreCase(const XMLInt32 ch1, const XMLInt32 ch2);

    /**
      *    Helper methods used by match(Context* ...)
      */
    bool matchChar(Context* const context, const XMLInt32 ch, int& offset,
                   const short direction, const bool ignoreCase);
    bool matchDot(Context* const context, int& offset, const short direction);
    bool matchRange(Context* const context, const Op* const op,
                    int& offset, const short direction, const bool ignoreCase);
    bool matchAnchor(Context* const context, const XMLInt32 ch,
                     const int offset);
    bool matchBackReference(Context* const context, const XMLInt32 ch,
                            int& offset, const short direction,
                            const bool ignoreCase);
    bool matchString(Context* const context, const XMLCh* const literal,
                     int& offset, const short direction, const bool ignoreCase);
    int  matchUnion(Context* const context, const Op* const op, int offset,
                    const short direction);
    int matchCapture(Context* const context, const Op* const op, int offset,
                     const short direction);
    bool matchCondition(Context* const context, const Op* const op, int offset,
                        const short direction);
    int matchModifier(Context* const context, const Op* const op, int offset,
                      const short direction);

    /**
     *    Tokenize helper
     *
     *    This overloaded tokenize is for internal use only. It provides a way to
     *    keep track of the sub-expressions in each match of the pattern.
     *
     *    It is called by the other tokenize methods, and by the replace method.
     *    The caller is responsible for the deletion of the returned
     *    RefArrayVectorOf<XMLCh*>
     */
    RefArrayVectorOf<XMLCh> *tokenize(const XMLCh* const matchString,
                                      const int start, const int end,
                                      RefVectorOf<Match> *subEx);
    /**
     *    Replace helpers
     *
     *    Note: the caller owns the XMLCh* that is returned
     */
    const XMLCh *subInExp(const XMLCh* const repString,
                          const XMLCh* const origString,
                          const Match* subEx);
    /**
     *    Converts a token tree into an operation tree
     */
    void compile(const Token* const token);
    Op*  compile(const Token* const token, Op* const next,
                 const bool reverse);
    /**
      *    Helper methods used by compile
      */
    Op* compileSingle(const Token* const token, Op* const next,
                      const unsigned short tokType);
    Op* compileUnion(const Token* const token, Op* const next,
                     const bool reverse);
    Op* compileCondition(const Token* const token, Op* const next,
                         const bool reverse);
    Op* compileParenthesis(const Token* const token, Op* const next,
                           const bool reverse);
    Op* compileLook(const Token* const token, const Op* const next,
                    const bool reverse, const unsigned short tokType);
    Op* compileConcat(const Token* const token, Op* const next,
                      const bool reverse);
    Op* compileClosure(const Token* const token, Op* const next,
                       const bool reverse, const unsigned short tokType);

    // -----------------------------------------------------------------------
    //  Private data members
    // -----------------------------------------------------------------------
    bool               fHasBackReferences;
    bool               fFixedStringOnly;
    int                fNoGroups;
    int                fMinLength;
    int                fNoClosures;
    unsigned int       fOptions;
    BMPattern*         fBMPattern;