qscriptecmanumber.cpp

奇趣公司比较新的qt/emd版本

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#include "qscriptecmanumber_p.h"

#ifndef QT_NO_SCRIPT

#include "qscriptengine_p.h"
#include "qscriptvalueimpl_p.h"
#include "qscriptcontext_p.h"
#include "qscriptmember_p.h"
#include "qscriptobject_p.h"

#include <QtCore/QtDebug>
#include <QtCore/qnumeric.h>

namespace QScript { namespace Ecma {

Number::Number(QScriptEnginePrivate *eng):
    Core(eng)
{
    m_classInfo = eng->registerClass(QLatin1String("Number"));

    publicPrototype.invalidate();
    newNumber(&publicPrototype, 0);

    eng->newConstructor(&ctor, this, publicPrototype);

    QScriptValue::PropertyFlags flags = QScriptValue::SkipInEnumeration;

    publicPrototype.setProperty(QLatin1String("toString"),
                                eng->createFunction(method_toString, 0, m_classInfo), flags);
    publicPrototype.setProperty(QLatin1String("toLocaleString"),
                                eng->createFunction(method_toLocaleString, 0, m_classInfo), flags);
    publicPrototype.setProperty(QLatin1String("valueOf"),
                                eng->createFunction(method_valueOf, 0, m_classInfo), flags);
    publicPrototype.setProperty(QLatin1String("toFixed"),
                                eng->createFunction(method_toFixed, 0, m_classInfo), flags);
    publicPrototype.setProperty(QLatin1String("toExponential"),
                                eng->createFunction(method_toExponential, 0, m_classInfo), flags);
    publicPrototype.setProperty(QLatin1String("toPrecision"),
                                eng->createFunction(method_toPrecision, 0, m_classInfo), flags);

    flags = QScriptValue::Undeletable
            | QScriptValue::ReadOnly
            | QScriptValue::SkipInEnumeration;
    ctor.setProperty(QLatin1String("NaN"),
                     QScriptValueImpl(eng, qSNaN()), flags);
    ctor.setProperty(QLatin1String("NEGATIVE_INFINITY"),
                     QScriptValueImpl(eng, -qInf()), flags);
    ctor.setProperty(QLatin1String("POSITIVE_INFINITY"),
                     QScriptValueImpl(eng, qInf()), flags);
    ctor.setProperty(QLatin1String("MAX_VALUE"),
                     QScriptValueImpl(eng, 1.7976931348623158e+308), flags);
#ifdef __INTEL_COMPILER
# pragma warning( push )
# pragma warning(disable: 239)
#endif
    ctor.setProperty(QLatin1String("MIN_VALUE"),
                     QScriptValueImpl(eng, 5e-324), flags);
#ifdef __INTEL_COMPILER
# pragma warning( pop )
#endif
}

Number::~Number()
{
}

void Number::execute(QScriptContextPrivate *context)
{
    qsreal value;
    if (context->argumentCount() > 0)
        value = context->argument(0).toNumber();
    else
        value = 0;

    QScriptValueImpl num(engine(), value);
    if (!context->isCalledAsConstructor()) {
        context->setReturnValue(num);
    } else {
        QScriptValueImpl &obj = context->m_thisObject;
        obj.setClassInfo(classInfo());
        obj.setInternalValue(num);
        obj.setPrototype(publicPrototype);
        context->setReturnValue(obj);
    }
}

void Number::newNumber(QScriptValueImpl *result, qsreal value)
{
    engine()->newObject(result, publicPrototype, classInfo());
    result->setInternalValue(QScriptValueImpl(engine(), value));
}

QScriptValueImpl Number::method_toString(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.toString"));

    QString str = self.internalValue().toString();
    return (QScriptValueImpl(eng, str));
}

QScriptValueImpl Number::method_toLocaleString(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.toLocaleString"));

    QString str = self.internalValue().toString();
    return (QScriptValueImpl(eng, str));
}

QScriptValueImpl Number::method_valueOf(QScriptContextPrivate *context, QScriptEnginePrivate *, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.valueOf"));

    return (self.internalValue());
}

QScriptValueImpl Number::method_toFixed(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.toFixed"));

    qsreal fdigits = 0;

    if (context->argumentCount() > 0)
        fdigits = context->argument(0).toInteger();

    if (qIsNaN(fdigits))
        fdigits = 0;

    qsreal v = self.internalValue().toNumber();
    return (QScriptValueImpl(eng, QString::number(v, 'f', int (fdigits))));
}

QScriptValueImpl Number::method_toExponential(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.toExponential"));

    qsreal fdigits = 0;

    if (context->argumentCount() > 0)
        fdigits = context->argument(0).toInteger();

    qsreal v = self.internalValue().toNumber();
    QString z = QString::number(v, 'e', int (fdigits));
    return (QScriptValueImpl(eng, z));
}

QScriptValueImpl Number::method_toPrecision(QScriptContextPrivate *context, QScriptEnginePrivate *eng, QScriptClassInfo *classInfo)
{
    QScriptValueImpl self = context->thisObject();
    if (self.classInfo() != classInfo)
        return context->throwError(QScriptContext::TypeError,
                                   QLatin1String("Number.prototype.toPrecision"));

    qsreal fdigits = 0;

    if (context->argumentCount() > 0)
        fdigits = context->argument(0).toInteger();

    qsreal v = self.internalValue().toNumber();
    return (QScriptValueImpl(eng, QString::number(v, 'g', int (fdigits))));
}

} } // namespace QScript::Ecma

#endif // QT_NO_SCRIPT