operations.cpp

linux下开源浏览器WebKit的源码,市面上的很多商用浏览器都是移植自WebKit

/*
 * Copyright (C) 1999-2000 Harri Porten ([e-mail])
 * Copyright (C) 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 Library 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
 *  Library General Public License for more details.
 *
 *  You should have received a copy of the GNU Library General Public License
 *  along with this library; see the file COPYING.LIB.  If not, write to
 *  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 *  Boston, MA 02110-1301, USA.
 *
 */

#include "config.h"
#include "Operations.h"

#include "Error.h"
#include "JSObject.h"
#include "JSString.h"
#include <math.h>
#include <stdio.h>
#include <wtf/MathExtras.h>

#if HAVE(FLOAT_H)
#include <float.h>
#endif

namespace JSC {

bool JSValuePtr::equalSlowCase(ExecState* exec, JSValuePtr v1, JSValuePtr v2)
{
    return equalSlowCaseInline(exec, v1, v2);
}

bool JSValuePtr::strictEqualSlowCase(JSValuePtr v1, JSValuePtr v2)
{
    return strictEqualSlowCaseInline(v1, v2);
}

NEVER_INLINE JSValuePtr throwOutOfMemoryError(ExecState* exec)
{
    JSObject* error = Error::create(exec, GeneralError, "Out of memory");
    exec->setException(error);
    return error;
}

NEVER_INLINE JSValuePtr jsAddSlowCase(CallFrame* callFrame, JSValuePtr v1, JSValuePtr v2)
{
    // exception for the Date exception in defaultValue()
    JSValuePtr p1 = v1.toPrimitive(callFrame);
    JSValuePtr p2 = v2.toPrimitive(callFrame);

    if (p1.isString() || p2.isString()) {
        RefPtr<UString::Rep> value = concatenate(p1.toString(callFrame).rep(), p2.toString(callFrame).rep());
        if (!value)
            return throwOutOfMemoryError(callFrame);
        return jsString(callFrame, value.release());
    }

    return jsNumber(callFrame, p1.toNumber(callFrame) + p2.toNumber(callFrame));
}

JSValuePtr jsTypeStringForValue(CallFrame* callFrame, JSValuePtr v)
{
    if (v.isUndefined())
        return jsNontrivialString(callFrame, "undefined");
    if (v.isBoolean())
        return jsNontrivialString(callFrame, "boolean");
    if (v.isNumber())
        return jsNontrivialString(callFrame, "number");
    if (v.isString())
        return jsNontrivialString(callFrame, "string");
    if (v.isObject()) {
        // Return "undefined" for objects that should be treated
        // as null when doing comparisons.
        if (asObject(v)->structure()->typeInfo().masqueradesAsUndefined())
            return jsNontrivialString(callFrame, "undefined");
        CallData callData;
        if (asObject(v)->getCallData(callData) != CallTypeNone)
            return jsNontrivialString(callFrame, "function");
    }
    return jsNontrivialString(callFrame, "object");
}

bool jsIsObjectType(JSValuePtr v)
{
    if (!v.isCell())
        return v.isNull();

    JSType type = asCell(v)->structure()->typeInfo().type();
    if (type == NumberType || type == StringType)
        return false;
    if (type == ObjectType) {
        if (asObject(v)->structure()->typeInfo().masqueradesAsUndefined())
            return false;
        CallData callData;
        if (asObject(v)->getCallData(callData) != CallTypeNone)
            return false;
    }
    return true;
}

bool jsIsFunctionType(JSValuePtr v)
{
    if (v.isObject()) {
        CallData callData;
        if (asObject(v)->getCallData(callData) != CallTypeNone)
            return true;
    }
    return false;
}

} // namespace JSC