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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, 2006, 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.
*
*/
#ifndef JSString_h
#define JSString_h
#include "CommonIdentifiers.h"
#include "CallFrame.h"
#include "Identifier.h"
#include "JSNumberCell.h"
#include "PropertySlot.h"
namespace JSC {
class JSString;
JSString* jsEmptyString(JSGlobalData*);
JSString* jsEmptyString(ExecState*);
JSString* jsString(JSGlobalData*, const UString&); // returns empty string if passed null string
JSString* jsString(ExecState*, const UString&); // returns empty string if passed null string
JSString* jsSingleCharacterString(JSGlobalData*, UChar);
JSString* jsSingleCharacterString(ExecState*, UChar);
JSString* jsSingleCharacterSubstring(JSGlobalData*, const UString&, unsigned offset);
JSString* jsSingleCharacterSubstring(ExecState*, const UString&, unsigned offset);
JSString* jsSubstring(JSGlobalData*, const UString&, unsigned offset, unsigned length);
JSString* jsSubstring(ExecState*, const UString&, unsigned offset, unsigned length);
// Non-trivial strings are two or more characters long.
// These functions are faster than just calling jsString.
JSString* jsNontrivialString(JSGlobalData*, const UString&);
JSString* jsNontrivialString(ExecState*, const UString&);
JSString* jsNontrivialString(JSGlobalData*, const char*);
JSString* jsNontrivialString(ExecState*, const char*);
// 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
JSString* jsOwnedString(JSGlobalData*, const UString&);
JSString* jsOwnedString(ExecState*, const UString&);
class JSString : public JSCell {
friend class JIT;
friend class VPtrSet;
public:
JSString(JSGlobalData* globalData, const UString& value)
: JSCell(globalData->stringStructure.get())
, m_value(value)
{
Heap::heap(this)->reportExtraMemoryCost(value.cost());
}
enum HasOtherOwnerType { HasOtherOwner };
JSString(JSGlobalData* globalData, const UString& value, HasOtherOwnerType)
: JSCell(globalData->stringStructure.get())
, m_value(value)
{
}
JSString(JSGlobalData* globalData, PassRefPtr<UString::Rep> value, HasOtherOwnerType)
: JSCell(globalData->stringStructure.get())
, m_value(value)
{
}
const UString& value() const { return m_value; }
bool getStringPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
bool getStringPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
bool getStringPropertyAttributes(ExecState*, const Identifier& propertyName, unsigned&) const;
bool canGetIndex(unsigned i) { return i < static_cast<unsigned>(m_value.size()); }
JSString* getIndex(JSGlobalData*, unsigned);
static PassRefPtr<Structure> createStructure(JSValue proto) { return Structure::create(proto, TypeInfo(StringType, NeedsThisConversion)); }
private:
enum VPtrStealingHackType { VPtrStealingHack };
JSString(VPtrStealingHackType)
: JSCell(0)
{
}
virtual JSValue toPrimitive(ExecState*, PreferredPrimitiveType) const;
virtual bool getPrimitiveNumber(ExecState*, double& number, JSValue& value);
virtual bool toBoolean(ExecState*) const;
virtual double toNumber(ExecState*) const;
virtual JSObject* toObject(ExecState*) const;
virtual UString toString(ExecState*) const;
virtual JSObject* toThisObject(ExecState*) const;
virtual UString toThisString(ExecState*) const;
virtual JSString* toThisJSString(ExecState*);
// Actually getPropertySlot, not getOwnPropertySlot (see JSCell).
virtual bool getOwnPropertySlot(ExecState*, const Identifier& propertyName, PropertySlot&);
virtual bool getOwnPropertySlot(ExecState*, unsigned propertyName, PropertySlot&);
UString m_value;
};
JSString* asString(JSValue);
inline JSString* asString(JSValue value)
{
ASSERT(asCell(value)->isString());
return static_cast<JSString*>(asCell(value));
}
inline JSString* jsEmptyString(JSGlobalData* globalData)
{
return globalData->smallStrings.emptyString(globalData);
}
inline JSString* jsSingleCharacterString(JSGlobalData* globalData, UChar c)
{
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
return new (globalData) JSString(globalData, UString(&c, 1));
}
inline JSString* jsSingleCharacterSubstring(JSGlobalData* globalData, const UString& s, unsigned offset)
{
ASSERT(offset < static_cast<unsigned>(s.size()));
UChar c = s.data()[offset];
if (c <= 0xFF)
return globalData->smallStrings.singleCharacterString(globalData, c);
return new (globalData) JSString(globalData, UString::Rep::create(s.rep(), offset, 1));
}
inline JSString* jsNontrivialString(JSGlobalData* globalData, const char* s)
{
ASSERT(s);
ASSERT(s[0]);
ASSERT(s[1]);
return new (globalData) JSString(globalData, s);
}
inline JSString* jsNontrivialString(JSGlobalData* globalData, const UString& s)
{
ASSERT(s.size() > 1);
return new (globalData) JSString(globalData, s);
}
inline JSString* JSString::getIndex(JSGlobalData* globalData, unsigned i)
{
ASSERT(canGetIndex(i));
return jsSingleCharacterSubstring(globalData, m_value, i);
}
inline JSString* jsEmptyString(ExecState* exec) { return jsEmptyString(&exec->globalData()); }
inline JSString* jsString(ExecState* exec, const UString& s) { return jsString(&exec->globalData(), s); }
inline JSString* jsSingleCharacterString(ExecState* exec, UChar c) { return jsSingleCharacterString(&exec->globalData(), c); }
inline JSString* jsSingleCharacterSubstring(ExecState* exec, const UString& s, unsigned offset) { return jsSingleCharacterSubstring(&exec->globalData(), s, offset); }
inline JSString* jsSubstring(ExecState* exec, const UString& s, unsigned offset, unsigned length) { return jsSubstring(&exec->globalData(), s, offset, length); }
inline JSString* jsNontrivialString(ExecState* exec, const UString& s) { return jsNontrivialString(&exec->globalData(), s); }
inline JSString* jsNontrivialString(ExecState* exec, const char* s) { return jsNontrivialString(&exec->globalData(), s); }
inline JSString* jsOwnedString(ExecState* exec, const UString& s) { return jsOwnedString(&exec->globalData(), s); }
ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, const Identifier& propertyName, PropertySlot& slot)
{
if (propertyName == exec->propertyNames().length) {
slot.setValue(jsNumber(exec, m_value.size()));
return true;
}
bool isStrictUInt32;
unsigned i = propertyName.toStrictUInt32(&isStrictUInt32);
if (isStrictUInt32 && i < static_cast<unsigned>(m_value.size())) {
slot.setValue(jsSingleCharacterSubstring(exec, m_value, i));
return true;
}
return false;
}
ALWAYS_INLINE bool JSString::getStringPropertySlot(ExecState* exec, unsigned propertyName, PropertySlot& slot)
{
if (propertyName < static_cast<unsigned>(m_value.size())) {
slot.setValue(jsSingleCharacterSubstring(exec, m_value, propertyName));
return true;
}
return false;
}
inline bool isJSString(JSGlobalData* globalData, JSValue v) { return v.isCell() && v.asCell()->vptr() == globalData->jsStringVPtr; }
// --- JSValue inlines ----------------------------
inline JSString* JSValue::toThisJSString(ExecState* exec)
{
return JSImmediate::isImmediate(asValue()) ? jsString(exec, JSImmediate::toString(asValue())) : asCell()->toThisJSString(exec);
}
} // namespace JSC
#endif // JSString_h
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