/*
 * Copyright 2008, Haiku.
 * Distributed under the terms of the MIT license.
 *
 * Authors:
 *              Michael Pfeiffer <laplace@users.sourceforge.net>
 */

#ifndef _SCANNER_H
#define _SCANNER_H

#include "CharacterClasses.h"
#include "PPDFile.h"

class Scanner {
private:        
        PPDFile* fCurrentFile;
        BString  fLastError;
        BString  fWarnings;
        
        BString* Scan(bool (cond)(int ch));
        bool ScanHexadecimalSubstring(BString* literal);
        BString* ScanLiteral(bool quotedValue, int separator);
        
public:
        Scanner(const char* file);
        virtual ~Scanner();
        
        status_t InitCheck();
        
        // Returns the current character or -1 if on EOF.
        int GetCurrentChar();
        // Reads the next character. Use GetChar to read the current 
        void NextChar();
        // Returns the position of the current character
        Position GetPosition();
        // Returns the file name of the current character
        const char* GetFileName();
        
        BString* ScanIdent()            { return Scan(IsIdentChar); }
        BString* ScanOption()           { return Scan(IsOptionChar); }
        BString* ScanSymbolValue()      { return Scan(IsPrintableWithoutWhitespaces); }
        BString* ScanInvocationValue()  { return Scan(IsPrintableWithWhitespaces); }
        BString* ScanStringValue()      { return Scan(IsStringChar); }
        BString* ScanTranslationValue(int separator = kEof) 
                                                                        { return ScanLiteral(false, separator); }
        BString* ScanQuotedValue()      { return ScanLiteral(true, kEof); }
        
        // Include the file at the current position and read the first char.
        bool Include(const char* file);

        void Warning(const char* message);
        const char* GetWarningMessage();
        bool HasWarning();
        
        void Error(const char* message);        
        const char* GetErrorMessage();
        bool HasError();
};

#endif