/****************************************************************************
**
** Copyright (C) 2015 The Qt Company Ltd.
** Contact: http://www.qt.io/licensing/
**
** This file is part of the QtQml module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL21$
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 or version 3 as published by the Free
** Software Foundation and appearing in the file LICENSE.LGPLv21 and
** LICENSE.LGPLv3 included in the packaging of this file. Please review the
** following information to ensure the GNU Lesser General Public License
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** As a special exception, The Qt Company gives you certain additional
** rights. These rights are described in The Qt Company LGPL Exception
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****************************************************************************/

#include "qqmljsengine_p.h"
#include "qqmljsglobal_p.h"

#include <QtCore/qnumeric.h>
#include <QtCore/qhash.h>
#include <QtCore/qdebug.h>

QT_QML_BEGIN_NAMESPACE

namespace QQmlJS {

static inline int toDigit(char c)
{
    if ((c >= '0') && (c <= '9'))
        return c - '0';
    else if ((c >= 'a') && (c <= 'z'))
        return 10 + c - 'a';
    else if ((c >= 'A') && (c <= 'Z'))
        return 10 + c - 'A';
    return -1;
}

double integerFromString(const char *buf, int size, int radix)
{
    if (size == 0)
        return qSNaN();

    double sign = 1.0;
    int i = 0;
    if (buf[0] == '+') {
        ++i;
    } else if (buf[0] == '-') {
        sign = -1.0;
        ++i;
    }

    if (((size-i) >= 2) && (buf[i] == '0')) {
        if (((buf[i+1] == 'x') || (buf[i+1] == 'X'))
            && (radix < 34)) {
            if ((radix != 0) && (radix != 16))
                return 0;
            radix = 16;
            i += 2;
        } else {
            if (radix == 0) {
                radix = 8;
                ++i;
            }
        }
    } else if (radix == 0) {
        radix = 10;
    }

    int j = i;
    for ( ; i < size; ++i) {
        int d = toDigit(buf[i]);
        if ((d == -1) || (d >= radix))
            break;
    }
    double result;
    if (j == i) {
        if (!qstrcmp(buf, "Infinity"))
            result = qInf();
        else
            result = qSNaN();
    } else {
        result = 0;
        double multiplier = 1;
        for (--i ; i >= j; --i, multiplier *= radix)
            result += toDigit(buf[i]) * multiplier;
    }
    result *= sign;
    return result;
}

double integerFromString(const QString &str, int radix)
{
    QByteArray ba = str.trimmed().toLatin1();
    return integerFromString(ba.constData(), ba.size(), radix);
}


Engine::Engine()
    : _lexer(0), _directives(0)
{ }

Engine::~Engine()
{ }

void Engine::setCode(const QString &code)
{ _code = code; }

void Engine::addComment(int pos, int len, int line, int col)
{ if (len > 0) _comments.append(QQmlJS::AST::SourceLocation(pos, len, line, col)); }

QList<QQmlJS::AST::SourceLocation> Engine::comments() const
{ return _comments; }

Lexer *Engine::lexer() const
{ return _lexer; }

void Engine::setLexer(Lexer *lexer)
{ _lexer = lexer; }

Directives *Engine::directives() const
{ return _directives; }

void Engine::setDirectives(Directives *directives)
{ _directives = directives; }

MemoryPool *Engine::pool()
{ return &_pool; }

QStringRef Engine::newStringRef(const QString &text)
{
    const int pos = _extraCode.length();
    _extraCode += text;
    return _extraCode.midRef(pos, text.length());
}

QStringRef Engine::newStringRef(const QChar *chars, int size)
{ return newStringRef(QString(chars, size)); }

} // end of namespace QQmlJS

QT_QML_END_NAMESPACE
