/*

 *  Copyright (C) 1999-2000 Harri Porten (porten@kde.org)

 *  Copyright (C) 2007, 2008 Apple Inc. All Rights Reserved.

 *

 *  This library is free software; you can redistribute it and/or

 *  modify it under the terms of the GNU Lesser General Public

 *  License as published by the Free Software Foundation; either

 *  version 2 of the License, or (at your option) any later version.

 *

 *  This library is distributed in the hope that it will be useful,

 *  but WITHOUT ANY WARRANTY; without even the implied warranty of

 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 *  Lesser General Public License for more details.

 *

 *  You should have received a copy of the GNU Lesser General Public

 *  License along with this library; if not, write to the Free Software

 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

 *

 */

#include "config.h"

#include "MathObject.h"

#include "Lookup.h"

#include "ObjectPrototype.h"

#include "Operations.h"

#include <time.h>

#include <wtf/Assertions.h>

#include <wtf/MathExtras.h>

#include <wtf/RandomNumber.h>

#include <wtf/RandomNumberSeed.h>

namespace JSC {

ASSERT_CLASS_FITS_IN_CELL(MathObject);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState*);

static EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState*);

}

#include "MathObject.lut.h"

namespace JSC {

// ------------------------------ MathObject --------------------------------

const ClassInfo MathObject::info = { "Math", 0, 0, ExecState::mathTable };

/* Source for MathObject.lut.h

@begin mathTable

  abs           mathProtoFuncAbs               DontEnum|Function 1

  acos          mathProtoFuncACos              DontEnum|Function 1

  asin          mathProtoFuncASin              DontEnum|Function 1

  atan          mathProtoFuncATan              DontEnum|Function 1

  atan2         mathProtoFuncATan2             DontEnum|Function 2

  ceil          mathProtoFuncCeil              DontEnum|Function 1

  cos           mathProtoFuncCos               DontEnum|Function 1

  exp           mathProtoFuncExp               DontEnum|Function 1

  floor         mathProtoFuncFloor             DontEnum|Function 1

  log           mathProtoFuncLog               DontEnum|Function 1

  max           mathProtoFuncMax               DontEnum|Function 2

  min           mathProtoFuncMin               DontEnum|Function 2

  pow           mathProtoFuncPow               DontEnum|Function 2

  random        mathProtoFuncRandom            DontEnum|Function 0 

  round         mathProtoFuncRound             DontEnum|Function 1

  sin           mathProtoFuncSin               DontEnum|Function 1

  sqrt          mathProtoFuncSqrt              DontEnum|Function 1

  tan           mathProtoFuncTan               DontEnum|Function 1

@end

*/

MathObject::MathObject(ExecState* exec, JSGlobalObject* globalObject, NonNullPassRefPtr<Structure> structure)

    : JSObjectWithGlobalObject(globalObject, structure)

{

    putDirectWithoutTransition(Identifier(exec, "E"), jsNumber(exec, exp(1.0)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "LN2"), jsNumber(exec, log(2.0)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "LN10"), jsNumber(exec, log(10.0)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "LOG2E"), jsNumber(exec, 1.0 / log(2.0)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "LOG10E"), jsNumber(exec, 1.0 / log(10.0)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "PI"), jsNumber(exec, piDouble), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "SQRT1_2"), jsNumber(exec, sqrt(0.5)), DontDelete | DontEnum | ReadOnly);

    putDirectWithoutTransition(Identifier(exec, "SQRT2"), jsNumber(exec, sqrt(2.0)), DontDelete | DontEnum | ReadOnly);

}

// ECMA 15.8

bool MathObject::getOwnPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot &slot)

{

    return getStaticFunctionSlot<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, slot);

}

bool MathObject::getOwnPropertyDescriptor(ExecState* exec, const Identifier& propertyName, PropertyDescriptor& descriptor)

{

    return getStaticFunctionDescriptor<JSObject>(exec, ExecState::mathTable(exec), this, propertyName, descriptor);

}

// ------------------------------ Functions --------------------------------

EncodedJSValue JSC_HOST_CALL mathProtoFuncAbs(ExecState* exec)

{

    return JSValue::encode(jsNumber(exec, fabs(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncACos(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, acos(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncASin(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, asin(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncATan(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, atan(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncATan2(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, atan2(exec->argument(0).toNumber(exec), exec->argument(1).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncCeil(ExecState* exec)

{

    return JSValue::encode(jsNumber(exec, ceil(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncCos(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, cos(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncExp(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, exp(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncFloor(ExecState* exec)

{

    return JSValue::encode(jsNumber(exec, floor(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncLog(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, log(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncMax(ExecState* exec)

{

    unsigned argsCount = exec->argumentCount();

    double result = -Inf;

    for (unsigned k = 0; k < argsCount; ++k) {

        double val = exec->argument(k).toNumber(exec);

        if (isnan(val)) {

            result = NaN;

            break;

        }

        if (val > result || (val == 0 && result == 0 && !signbit(val)))

            result = val;

    }

    return JSValue::encode(jsNumber(exec, result));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncMin(ExecState* exec)

{

    unsigned argsCount = exec->argumentCount();

    double result = +Inf;

    for (unsigned k = 0; k < argsCount; ++k) {

        double val = exec->argument(k).toNumber(exec);

        if (isnan(val)) {

            result = NaN;

            break;

        }

        if (val < result || (val == 0 && result == 0 && signbit(val)))

            result = val;

    }

    return JSValue::encode(jsNumber(exec, result));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncPow(ExecState* exec)

{

    // ECMA 15.8.2.1.13

    double arg = exec->argument(0).toNumber(exec);

    double arg2 = exec->argument(1).toNumber(exec);

    if (isnan(arg2))

        return JSValue::encode(jsNaN(exec));

    if (isinf(arg2) && fabs(arg) == 1)

        return JSValue::encode(jsNaN(exec));

    return JSValue::encode(jsNumber(exec, pow(arg, arg2)));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncRandom(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, exec->globalData().weakRandom.get()));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncRound(ExecState* exec)

{

    double arg = exec->argument(0).toNumber(exec);

    double integer = ceil(arg);

    return JSValue::encode(jsNumber(exec, integer - (integer - arg > 0.5)));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncSin(ExecState* exec)

{

    return JSValue::encode(exec->globalData().cachedSin(exec, exec->argument(0).toNumber(exec)));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncSqrt(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, sqrt(exec->argument(0).toNumber(exec))));

}

EncodedJSValue JSC_HOST_CALL mathProtoFuncTan(ExecState* exec)

{

    return JSValue::encode(jsDoubleNumber(exec, tan(exec->argument(0).toNumber(exec))));

}

} // namespace JSC