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src/core/scanner.h

//------------------------------------------------------------------------------
// scanner.hpp
//------------------------------------------------------------------------------
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License
// as published by the Free Software Foundation; either version 2
// of the License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
// 02110-1301, USA.
//
//------------------------------------------------------------------------------
// Copyright (C) 2010 "Blzut3" <admin@maniacsvault.net>
//------------------------------------------------------------------------------

#ifndef __SCANNER_HPP__
#define __SCANNER_HPP__

#include <QObject>
#include <QString>

#include "global.h"

enum ETokenType
{
        TK_Identifier,          // Ex: SomeIdentifier
        TK_StringConst,         // Ex: "Some String"
        TK_IntConst,            // Ex: 27
        TK_FloatConst,          // Ex: 1.5
        TK_BoolConst,           // Ex: true
        TK_AndAnd,                      // &&
        TK_OrOr,                        // ||
        TK_EqEq,                        // ==
        TK_NotEq,                       // !=
        TK_GtrEq,                       // >=
        TK_LessEq,                      // <=
        TK_ShiftLeft,           // <<
        TK_ShiftRight,          // >>
        TK_Increment,           // ++
        TK_Decrement,           // --
        TK_PointerMember,       // ->
        TK_ScopeResolution,     // ::
        TK_MacroConcat,         // ##
        TK_AddEq,                       // +=
        TK_SubEq,                       // -=
        TK_MulEq,                       // *=
        TK_DivEq,                       // /=
        TK_ModEq,                       // %=
        TK_ShiftLeftEq,         // <<=
        TK_ShiftRightEq,        // >>=
        TK_AndEq,                       // &=
        TK_OrEq,                        // |=
        TK_XorEq,                       // ^=
        TK_Ellipsis,            // ...

        TK_NumSpecialTokens,

        TK_NoToken = -1
};

class MAIN_EXPORT Scanner
{
        public:
                struct ParserState
                {
                        QString                 str;
                        unsigned int    number;
                        double                  decimal;
                        bool                    boolean;
                        char                    token;
                        unsigned int    tokenLine;
                        unsigned int    tokenLinePosition;
                        unsigned int    scanPos;
                };

                enum MessageLevel
                {
                        ML_ERROR,
                        ML_WARNING,
                        ML_NOTICE
                };

                Scanner(const char* data, int length=-1);
                ~Scanner();

                void                    checkForMeta();
                void                    checkForWhitespace();
                bool                    checkToken(char token);
                void                    expandState();
                int                             currentLine() const { return state.tokenLine; }
                int                             currentLinePos() const { return state.tokenLinePosition; }
                int                             currentPos() const { return logicalPosition; }
                unsigned int    currentScanPos() const { return scanPos; }
                bool                    nextString();
                bool                    nextToken(bool autoExpandState=true);
                void                    mustGetToken(char token);
                void                    rewind(); 
                const char*             scriptData() const { return data; }
                void                    scriptMessage(MessageLevel level, const char* error, ...) const;
                void                    setScriptIdentifier(const QString &ident) { scriptIdentifier = ident; }
                int                             skipLine();

                bool                    tokensLeft() { return scanPos < length; }

                const ParserState &operator*() const { return state; }
                const ParserState *operator->() const { return &state; }

                static const QString& escape(QString &str);
                static const QString& unescape(QString &str);

                static void             setMessageHandler(void (*handler)(MessageLevel, const char*, va_list)) { messageHandler = handler; }

                ParserState             state;

        protected:
                void            incrementLine();

        private:
                ParserState             nextState, prevState;

                char*                   data;
                unsigned int    length;

                unsigned int    line;
                unsigned int    lineStart;
                unsigned int    logicalPosition;
                unsigned int    scanPos;

                bool                    needNext; // If checkToken returns false this will be false.

                QString                 scriptIdentifier;

                static void             (*messageHandler)(MessageLevel, const char*, va_list);
};

#endif /* __SCANNER_HPP__ */

   

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