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#ifndef SYMBOLS_H

#define SYMBOLS_H

#include "token.h"

#include <QString>

#include <QHash>

#include <QVector>

#include <QDebug>

QT_BEGIN_NAMESPACE

//#define USE_LEXEM_STORE

struct SubArray

{

    inline SubArray():from(0),len(-1){}

    inline SubArray(const QByteArray &a):array(a),from(0), len(a.size()){}

    inline SubArray(const char *s):array(s),from(0) { len = array.size(); }

    inline SubArray(const QByteArray &a, int from, int len):array(a), from(from), len(len){}

    QByteArray array;

    int from, len;

    inline bool operator==(const SubArray &other) const {

        if (len != other.len)

            return false;

        for (int i = 0; i < len; ++i)

            if (array.at(from + i) != other.array.at(other.from + i))

                return false;

        return true;

    }

};

inline uint qHash(const SubArray &key)

{

    const uchar *p = reinterpret_cast<const uchar *>(key.array.data() + key.from);

    int n = key.len;

    uint h = 0;

    uint g;

    while (n--) {

        h = (h << 4) + *p++;

        if ((g = (h & 0xf0000000)) != 0)

            h ^= g >> 23;

        h &= ~g;

    }

    return h;

}

struct Symbol

{

#ifdef USE_LEXEM_STORE

    typedef QHash<SubArray, QHashDummyValue> LexemStore;

    static LexemStore lexemStore;

    inline Symbol() : lineNum(-1),token(NOTOKEN){}

    inline Symbol(int lineNum, Token token):

        lineNum(lineNum), token(token){}

    inline Symbol(int lineNum, Token token, const QByteArray &lexem):

        lineNum(lineNum), token(token),lex(lexem){}

    inline Symbol(int lineNum, Token token, const QByteArray &lexem, int from, int len):

        lineNum(lineNum), token(token){

        LexemStore::const_iterator it = lexemStore.constFind(SubArray(lexem, from, len));

        if (it != lexemStore.constEnd()) {

            lex = it.key().array;

        } else {

            lex = lexem.mid(from, len);

            lexemStore.insert(lex, QHashDummyValue());

        }

    }

    int lineNum;

    Token token;

    inline QByteArray unquotedLexem() const { return lex.mid(1, lex.length()-2); }

    inline QByteArray lexem() const { return lex; }

    inline operator QByteArray() const { return lex; }

    QByteArray lex;

#else

    inline Symbol() : lineNum(-1),token(NOTOKEN), from(0),len(-1) {}

    inline Symbol(int lineNum, Token token):

        lineNum(lineNum), token(token), from(0), len(-1) {}

    inline Symbol(int lineNum, Token token, const QByteArray &lexem):

        lineNum(lineNum), token(token), lex(lexem), from(0) { len = lex.size(); }

    inline Symbol(int lineNum, Token token, const QByteArray &lexem, int from, int len):

        lineNum(lineNum), token(token),lex(lexem),from(from), len(len){}

    int lineNum;

    Token token;

    inline QByteArray lexem() const { return lex.mid(from, len); }

    inline QByteArray unquotedLexem() const { return lex.mid(from+1, len-2); }

    inline operator QByteArray() const { return lex.mid(from, len); }

    inline operator SubArray() const { return SubArray(lex, from, len); }

    QByteArray lex;

    int from, len;

#endif

};

Q_DECLARE_TYPEINFO(Symbol, Q_MOVABLE_TYPE);

typedef QVector<Symbol> Symbols;

QT_END_NAMESPACE

#endif // SYMBOLS_H