/usr/include/KF5/kjs/value.h is in libkf5kjs-dev 5.18.0-0ubuntu1.
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* This file is part of the KDE libraries
* Copyright (C) 1999-2001 Harri Porten (porten@kde.org)
* Copyright (C) 2001 Peter Kelly (pmk@post.com)
* Copyright (C) 2003, 2004, 2005, 2007 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.
*
*/
#ifndef KJS_VALUE_H
#define KJS_VALUE_H
#include "JSImmediate.h"
#include "ustring.h"
#include "collector.h"
#include <wtf/Noncopyable.h>
#include <stddef.h> // for size_t
#ifndef NDEBUG // protection against problems if committing with KJS_VERBOSE on
// Uncomment this to enable very verbose output from KJS
//#define KJS_VERBOSE
// Uncomment this to debug memory allocation and garbage collection
//#define KJS_DEBUG_MEM
#endif
namespace KJS
{
struct ClassInfo;
class ExecState;
class JSObject;
class JSCell;
/**
* JSValue is the base type for all primitives (Undefined, Null, Boolean,
* String, Number) and objects in ECMAScript.
*
* Note: you should never inherit from JSValue as it is for primitive types
* only (all of which are provided internally by KJS). Instead, inherit from
* JSObject.
*/
class KJS_EXPORT JSValue : Noncopyable
{
friend class JSCell; // so it can derive from this class
friend class Collector; // so it can call asCell()
private:
JSValue();
virtual ~JSValue();
public:
// Querying the type.
JSType type() const;
bool isUndefined() const;
bool isNull() const;
bool isUndefinedOrNull() const;
bool isBoolean() const;
bool isNumber() const;
bool isString() const;
bool isObject() const;
bool isObject(const ClassInfo *) const;
// Extracting the value.
bool getBoolean(bool &) const;
bool getBoolean() const; // false if not a boolean
bool getNumber(double &) const;
double getNumber() const; // NaN if not a number
bool getString(UString &) const;
UString getString() const; // null string if not a string
JSObject *getObject(); // NULL if not an object
const JSObject *getObject() const; // NULL if not an object
// Extracting integer values.
bool getUInt32(uint32_t &) const;
bool getTruncatedInt32(int32_t &) const;
bool getTruncatedUInt32(uint32_t &) const;
JSValue *getByIndex(ExecState *exec, unsigned propertyName) const;
// Basic conversions.
JSValue *toPrimitive(ExecState *exec, JSType preferredType = UnspecifiedType) const;
bool getPrimitiveNumber(ExecState *exec, double &number, JSValue *&value);
bool toBoolean(ExecState *exec) const;
double toNumber(ExecState *exec) const;
JSValue *toJSNumber(ExecState *) const; // Fast path for when you expect that the value is an immediate number.
UString toString(ExecState *exec) const;
JSObject *toObject(ExecState *exec) 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;
uint16_t toUInt16(ExecState *exec) const;
// These are identical logic to above, and faster than jsNumber(number)->toInt32(exec)
static int32_t toInt32(double);
static int32_t toUInt32(double);
// Floating point conversions.
float toFloat(ExecState *) const;
// Object-level properties...
/**
* Whether or not the value implements the call() method. If it does, this also
* implies this is an object, and hence it can be cast to a JSObject
* and the call method can be invoked
*
* @return true if this is an object implementing the call() method, otherwise
* false
*/
bool implementsCall() const;
// Garbage collection.
void mark();
bool marked() const;
static int32_t toInt32SlowCase(double, bool &ok);
static uint32_t toUInt32SlowCase(double, bool &ok);
private:
int32_t toInt32SlowCase(ExecState *, bool &ok) const;
uint32_t toUInt32SlowCase(ExecState *, bool &ok) const;
// Implementation details.
JSCell *asCell();
const JSCell *asCell() const;
// emulate Q_DISABLE_COPY to avoid msvc linker errors
#if !defined(_MSC_VER) || !defined(MAKE_KJS_LIB)
// Give a compile time error if we try to copy one of these.
JSValue(const JSValue &);
JSValue &operator=(const JSValue &);
#endif
};
class KJS_EXPORT JSCell : public JSValue
{
friend class Collector;
friend class NumberImp;
friend class StringImp;
friend class JSObject;
friend class GetterSetterImp;
private:
explicit JSCell();
virtual ~JSCell();
public:
// Querying the type.
virtual JSType type() const = 0;
bool isNumber() const;
bool isString() const;
bool isObject() const;
bool isObject(const ClassInfo *) const;
// Extracting the value.
bool getNumber(double &) const;
double getNumber() const; // NaN if not a number
bool getString(UString &) const;
UString getString() const; // null string if not a string
JSObject *getObject(); // NULL if not an object
const JSObject *getObject() const; // NULL if not an object
// Extracting integer values.
virtual bool getUInt32(uint32_t &) const;
virtual bool getTruncatedInt32(int32_t &) const;
virtual bool getTruncatedUInt32(uint32_t &) const;
// Basic conversions.
virtual JSValue *toPrimitive(ExecState *exec, JSType preferredType = UnspecifiedType) const = 0;
virtual bool getPrimitiveNumber(ExecState *exec, double &number, JSValue *&value) = 0;
virtual bool toBoolean(ExecState *exec) const = 0;
virtual double toNumber(ExecState *exec) const = 0;
virtual UString toString(ExecState *exec) const = 0;
virtual JSObject *toObject(ExecState *exec) const = 0;
// Higher-level (object-like) properties:
virtual bool implementsCall() const;
// Garbage collection.
void *operator new(size_t);
virtual void mark();
bool marked() const;
};
KJS_EXPORT JSValue *jsNumberCell(double);
KJS_EXPORT JSCell *jsString(); // returns empty string
KJS_EXPORT JSCell *jsString(const UString &); // returns empty string if passed null string
KJS_EXPORT JSCell *jsString(const char * = ""); // returns empty string if passed 0
KJS_EXPORT JSCell *jsString(const char *s, int len);
// should be used for strings that are owned by an object that will
// likely outlive the JSValue this makes, such as the parse tree or a
// DOM object that contains a UString
JSCell *jsOwnedString(const UString &);
inline JSValue *jsUndefined()
{
return JSImmediate::undefinedImmediate();
}
inline JSValue *jsNull()
{
return JSImmediate::nullImmediate();
}
inline JSValue *jsNaN()
{
static const union {
uint64_t bits;
double d;
} nan = { 0x7ff80000ULL << 32 };
return jsNumberCell(nan.d);
}
inline JSValue *jsBoolean(bool b)
{
return b ? JSImmediate::trueImmediate() : JSImmediate::falseImmediate();
}
ALWAYS_INLINE JSValue *jsNumber(double d)
{
JSValue *v = JSImmediate::from(d);
return v ? v : jsNumberCell(d);
}
ALWAYS_INLINE JSValue *jsNumber(int i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(i);
}
ALWAYS_INLINE JSValue *jsNumber(unsigned i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(i);
}
ALWAYS_INLINE JSValue *jsNumber(long i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(i);
}
ALWAYS_INLINE JSValue *jsNumber(unsigned long i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(i);
}
ALWAYS_INLINE JSValue *jsNumber(long long i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(static_cast<double>(i));
}
ALWAYS_INLINE JSValue *jsNumber(unsigned long long i)
{
JSValue *v = JSImmediate::from(i);
return v ? v : jsNumberCell(static_cast<double>(i));
}
ALWAYS_INLINE JSValue *jsNumberFromAnd(ExecState *exec, JSValue *v1, JSValue *v2)
{
if (JSImmediate::areBothImmediateNumbers(v1, v2)) {
return JSImmediate::andImmediateNumbers(v1, v2);
}
return jsNumber(v1->toInt32(exec) & v2->toInt32(exec));
}
inline JSValue::JSValue()
{
}
inline JSValue::~JSValue()
{
}
inline JSCell::JSCell()
{
}
inline JSCell::~JSCell()
{
}
inline bool JSCell::isNumber() const
{
return type() == NumberType;
}
inline bool JSCell::isString() const
{
return type() == StringType;
}
inline bool JSCell::isObject() const
{
return type() == ObjectType;
}
inline bool JSCell::marked() const
{
return Collector::isCellMarked(this);
}
inline void JSCell::mark()
{
return Collector::markCell(this);
}
ALWAYS_INLINE JSCell *JSValue::asCell()
{
ASSERT(!JSImmediate::isImmediate(this));
return static_cast<JSCell *>(this);
}
ALWAYS_INLINE const JSCell *JSValue::asCell() const
{
ASSERT(!JSImmediate::isImmediate(this));
return static_cast<const JSCell *>(this);
}
inline bool JSValue::isUndefined() const
{
return this == jsUndefined();
}
inline bool JSValue::isNull() const
{
return this == jsNull();
}
inline bool JSValue::isUndefinedOrNull() const
{
return JSImmediate::isUndefinedOrNull(this);
}
inline bool JSValue::isBoolean() const
{
return JSImmediate::isBoolean(this);
}
inline bool JSValue::isNumber() const
{
return JSImmediate::isNumber(this) ||
(!JSImmediate::isImmediate(this) && asCell()->isNumber());
}
inline bool JSValue::isString() const
{
return !JSImmediate::isImmediate(this) && asCell()->isString();
}
inline bool JSValue::isObject() const
{
return !JSImmediate::isImmediate(this) && asCell()->isObject();
}
inline bool JSValue::getBoolean(bool &v) const
{
if (JSImmediate::isBoolean(this)) {
v = JSImmediate::toBoolean(this);
return true;
}
return false;
}
inline bool JSValue::getBoolean() const
{
return JSImmediate::isBoolean(this) ? JSImmediate::toBoolean(this) : false;
}
inline bool JSValue::getNumber(double &v) const
{
if (JSImmediate::isImmediate(this)) {
return JSImmediate::getNumber(this, v);
}
return asCell()->getNumber(v);
}
inline double JSValue::getNumber() const
{
return JSImmediate::isImmediate(this) ? JSImmediate::getNumber(this) : asCell()->getNumber();
}
inline bool JSValue::getString(UString &s) const
{
return !JSImmediate::isImmediate(this) && asCell()->getString(s);
}
inline UString JSValue::getString() const
{
return JSImmediate::isImmediate(this) ? UString() : asCell()->getString();
}
inline JSObject *JSValue::getObject()
{
return JSImmediate::isImmediate(this) ? 0 : asCell()->getObject();
}
inline const JSObject *JSValue::getObject() const
{
return JSImmediate::isImmediate(this) ? 0 : asCell()->getObject();
}
ALWAYS_INLINE bool JSValue::getUInt32(uint32_t &v) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::getUInt32(this, v) : asCell()->getUInt32(v);
}
ALWAYS_INLINE bool JSValue::getTruncatedInt32(int32_t &v) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::getTruncatedInt32(this, v) : asCell()->getTruncatedInt32(v);
}
inline bool JSValue::getTruncatedUInt32(uint32_t &v) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::getTruncatedUInt32(this, v) : asCell()->getTruncatedUInt32(v);
}
inline void JSValue::mark()
{
ASSERT(!JSImmediate::isImmediate(this)); // callers should check !marked() before calling mark()
asCell()->mark();
}
inline bool JSValue::marked() const
{
return JSImmediate::isImmediate(this) || asCell()->marked();
}
inline JSType JSValue::type() const
{
return JSImmediate::isImmediate(this) ? JSImmediate::type(this) : asCell()->type();
}
inline JSValue *JSValue::toPrimitive(ExecState *exec, JSType preferredType) const
{
return JSImmediate::isImmediate(this) ? const_cast<JSValue *>(this) : asCell()->toPrimitive(exec, preferredType);
}
inline bool JSValue::getPrimitiveNumber(ExecState *exec, double &number, JSValue *&value)
{
if (JSImmediate::isImmediate(this)) {
number = JSImmediate::toDouble(this);
value = this;
return true;
}
return asCell()->getPrimitiveNumber(exec, number, value);
}
inline bool JSValue::toBoolean(ExecState *exec) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::toBoolean(this) : asCell()->toBoolean(exec);
}
ALWAYS_INLINE double JSValue::toNumber(ExecState *exec) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::toDouble(this) : asCell()->toNumber(exec);
}
ALWAYS_INLINE JSValue *JSValue::toJSNumber(ExecState *exec) const
{
return JSImmediate::isNumber(this) ? const_cast<JSValue *>(this) : jsNumber(this->toNumber(exec));
}
inline UString JSValue::toString(ExecState *exec) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::toString(this) : asCell()->toString(exec);
}
inline JSObject *JSValue::toObject(ExecState *exec) const
{
return JSImmediate::isImmediate(this) ? JSImmediate::toObject(this, exec) : asCell()->toObject(exec);
}
ALWAYS_INLINE int32_t JSValue::toInt32(ExecState *exec) const
{
int32_t i;
if (getTruncatedInt32(i)) {
return i;
}
bool ok;
return toInt32SlowCase(exec, ok);
}
inline uint32_t JSValue::toUInt32(ExecState *exec) const
{
uint32_t i;
if (getTruncatedUInt32(i)) {
return i;
}
bool ok;
return toUInt32SlowCase(exec, ok);
}
inline int32_t JSValue::toInt32(double val)
{
if (!(val >= -2147483648.0 && val < 2147483648.0)) {
bool ignored;
return toInt32SlowCase(val, ignored);
}
return static_cast<int32_t>(val);
}
inline int32_t JSValue::toUInt32(double val)
{
if (!(val >= 0.0 && val < 4294967296.0)) {
bool ignored;
return toUInt32SlowCase(val, ignored);
}
return static_cast<uint32_t>(val);
}
inline int32_t JSValue::toInt32(ExecState *exec, bool &ok) const
{
int32_t i;
if (getTruncatedInt32(i)) {
ok = true;
return i;
}
return toInt32SlowCase(exec, ok);
}
inline uint32_t JSValue::toUInt32(ExecState *exec, bool &ok) const
{
uint32_t i;
if (getTruncatedUInt32(i)) {
ok = true;
return i;
}
return toUInt32SlowCase(exec, ok);
}
inline bool JSValue::implementsCall() const
{
if (JSImmediate::isImmediate(this)) {
return false; // immediate values are never calleable.
} else {
return asCell()->implementsCall();
}
}
} // namespace
#endif // KJS_VALUE_H
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