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/*
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 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 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 <stddef.h> // for size_t
#include <stdint.h>
#ifndef JSValue_h
#define JSValue_h
#include "CallData.h"
#include "ConstructData.h"
#include <wtf/Noncopyable.h>
namespace JSC {
class Identifier;
class JSCell;
class JSObject;
class JSString;
class PropertySlot;
class PutPropertySlot;
class UString;
struct ClassInfo;
struct Instruction;
enum PreferredPrimitiveType { NoPreference, PreferNumber, PreferString };
class JSValue : Noncopyable {
protected:
JSValue() { }
virtual ~JSValue() { }
public:
// Querying the type.
bool isUndefined() const;
bool isNull() const;
bool isUndefinedOrNull() const;
bool isBoolean() const;
bool isNumber() const;
bool isString() const;
bool isGetterSetter() const;
bool isObject() const;
bool isObject(const ClassInfo*) const;
// Extracting the value.
bool getBoolean(bool&) const;
bool getBoolean() const; // false if not a boolean
double getNumber() const; // NaN if not a number
double uncheckedGetNumber() const;
bool getString(UString&) const;
UString getString() const; // null string if not a string
JSObject* getObject() const; // 0 if not an object
CallType getCallData(CallData&);
ConstructType getConstructData(ConstructData&);
// Extracting integer values.
bool getUInt32(uint32_t&) const;
bool getTruncatedInt32(int32_t&) const;
bool getTruncatedUInt32(uint32_t&) const;
// Basic conversions.
JSValuePtr toPrimitive(ExecState*, PreferredPrimitiveType = NoPreference) const;
bool getPrimitiveNumber(ExecState*, double& number, JSValuePtr&);
bool toBoolean(ExecState*) const;
// toNumber conversion is expected to be side effect free if an exception has
// been set in the ExecState already.
double toNumber(ExecState*) const;
JSValuePtr toJSNumber(ExecState*) const; // Fast path for when you expect that the value is an immediate number.
UString toString(ExecState*) const;
JSObject* toObject(ExecState*) const;
// Integer conversions.
double toInteger(ExecState*) const;
double toIntegerPreserveNaN(ExecState*) const;
int32_t toInt32(ExecState*) const;
int32_t toInt32(ExecState*, bool& ok) const;
uint32_t toUInt32(ExecState*) const;
uint32_t toUInt32(ExecState*, bool& ok) const;
// Floating point conversions.
float toFloat(ExecState*) const;
// Garbage collection.
void mark();
bool marked() const;
// Object operations, with the toObject operation included.
JSValuePtr get(ExecState*, const Identifier& propertyName) const;
JSValuePtr get(ExecState*, const Identifier& propertyName, PropertySlot&) const;
JSValuePtr get(ExecState*, unsigned propertyName) const;
JSValuePtr get(ExecState*, unsigned propertyName, PropertySlot&) const;
void put(ExecState*, const Identifier& propertyName, JSValuePtr, PutPropertySlot&);
void put(ExecState*, unsigned propertyName, JSValuePtr);
bool deleteProperty(ExecState*, const Identifier& propertyName);
bool deleteProperty(ExecState*, unsigned propertyName);
bool needsThisConversion() const;
JSObject* toThisObject(ExecState*) const;
UString toThisString(ExecState*) const;
JSString* toThisJSString(ExecState*);
JSValuePtr getJSNumber(); // 0 if this is not a JSNumber or number object
JSValuePtr asValue() const;
JSCell* asCell() const;
private:
bool getPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
bool getPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
int32_t toInt32SlowCase(ExecState*, bool& ok) const;
uint32_t toUInt32SlowCase(ExecState*, bool& ok) const;
};
class JSImmediate;
class JSValueEncodedAsPointer;
class JSValuePtr {
friend class JSImmediate;
static JSValuePtr makeImmediate(intptr_t value)
{
return JSValuePtr(reinterpret_cast<JSValue*>(value));
}
intptr_t immediateValue()
{
return reinterpret_cast<intptr_t>(m_ptr);
}
public:
JSValuePtr()
: m_ptr(0)
{
}
JSValuePtr(JSValue* ptr)
: m_ptr(ptr)
{
}
JSValuePtr(const JSValue* ptr)
: m_ptr(const_cast<JSValue*>(ptr))
{
}
JSValue* operator->() const
{
return m_ptr;
}
operator bool() const
{
return m_ptr;
}
bool operator==(const JSValuePtr other) const
{
return m_ptr == other.m_ptr;
}
bool operator!=(const JSValuePtr other) const
{
return m_ptr != other.m_ptr;
}
static JSValueEncodedAsPointer* encode(JSValuePtr value)
{
return reinterpret_cast<JSValueEncodedAsPointer*>(value.m_ptr);
}
static JSValuePtr decode(JSValueEncodedAsPointer* ptr)
{
return JSValuePtr(reinterpret_cast<JSValue*>(ptr));
}
private:
JSValue* m_ptr;
};
inline JSValuePtr JSValue::asValue() const
{
return JSValuePtr(this);
}
inline JSValuePtr noValue()
{
return JSValuePtr();
}
inline bool operator==(const JSValuePtr a, const JSValue* b) { return a == JSValuePtr(b); }
inline bool operator==(const JSValue* a, const JSValuePtr b) { return JSValuePtr(a) == b; }
inline bool operator!=(const JSValuePtr a, const JSValue* b) { return a != JSValuePtr(b); }
inline bool operator!=(const JSValue* a, const JSValuePtr b) { return JSValuePtr(a) != b; }
} // namespace JSC
#endif // JSValue_h
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