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#ifndef PARSER_H

#define PARSER_H

#include <QStack>

#include "symbols.h"

QT_BEGIN_NAMESPACE

class Parser

{

public:

    Parser():index(0), displayWarnings(true){}

    Symbols symbols;

    int index;

    bool displayWarnings;

    QStack<QByteArray> currentFilenames;

    inline bool hasNext() const { return (index < symbols.size()); }

    inline Token next() { if (index >= symbols.size()) return NOTOKEN; return symbols.at(index++).token; }

    bool test(Token);

    void next(Token);

    void next(Token, const char *msg);

    inline void prev() {--index;}

    inline Token lookup(int k = 1);

    inline const Symbol &symbol_lookup(int k = 1) { return symbols.at(index-1+k);}

    inline Token token() { return symbols.at(index-1).token;}

    inline QByteArray lexem() { return symbols.at(index-1).lexem();}

    inline QByteArray unquotedLexem() { return symbols.at(index-1).unquotedLexem();}

    inline const Symbol &symbol() { return symbols.at(index-1);}

    void error(int rollback);

    void error(const char *msg = 0);

    void warning(const char * = 0);

};

inline bool Parser::test(Token token)

{

    if (index < symbols.size() && symbols.at(index).token == token) {

        ++index;

        return true;

    }

    return false;

}

inline Token Parser::lookup(int k)

{

    const int l = index - 1 + k;

    return l < symbols.size() ? symbols.at(l).token : NOTOKEN;

}

inline void Parser::next(Token token)

{

    if (!test(token))

        error();

}

inline void Parser::next(Token token, const char *msg)

{

    if (!test(token))

        error(msg);

}

QT_END_NAMESPACE

#endif