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#include "TokenUnderCursor.h"
#include <Token.h>

#include <QTextCursor>
#include <QTextBlock>
#include <climits>

using namespace CPlusPlus;

TokenUnderCursor::TokenUnderCursor()
{ }

TokenUnderCursor::~TokenUnderCursor()
{ }

SimpleToken TokenUnderCursor::operator()(const QTextCursor &cursor) const
{
    SimpleLexer tokenize;
    QTextBlock block = cursor.block();
    int column = cursor.columnNumber();

    QList<SimpleToken> tokens = tokenize(block.text(), previousBlockState(block));
    for (int index = tokens.size() - 1; index != -1; --index) {
        const SimpleToken &tk = tokens.at(index);
        if (tk.position() < column)
            return tk;
    }

    return SimpleToken();
}

int TokenUnderCursor::previousBlockState(const QTextBlock &block) const
{
    const QTextBlock prevBlock = block.previous();
    if (prevBlock.isValid()) {
        int state = prevBlock.userState();

        if (state != -1)
            return state;
    }
    return 0;
}