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 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-

  * vim: set ts=8 sts=4 et sw=4 tw=99:

  * This Source Code Form is subject to the terms of the Mozilla Public

  * License, v. 2.0. If a copy of the MPL was not distributed with this

  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

 /*

  * JS boolean implementation.

  */

 #include "jsboolinlines.h"

 #include "jsapi.h"

 #include "jsatom.h"

 #include "jscntxt.h"

 #include "jsobj.h"

 #include "jstypes.h"

 #include "vm/GlobalObject.h"

 #include "vm/ProxyObject.h"

 #include "vm/StringBuffer.h"

 #include "vm/BooleanObject-inl.h"

 using namespace js;

 using namespace js::types;

 const Class BooleanObject::class_ = {

     "Boolean",

     JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),

     JS_PropertyStub,         /* addProperty */

     JS_DeletePropertyStub,   /* delProperty */

     JS_PropertyStub,         /* getProperty */

     JS_StrictPropertyStub,   /* setProperty */

     JS_EnumerateStub,

     JS_ResolveStub,

     JS_ConvertStub

 };

 MOZ_ALWAYS_INLINE bool

 IsBoolean(HandleValue v)

 {

     return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());

 }

 #if JS_HAS_TOSOURCE

 MOZ_ALWAYS_INLINE bool

 bool_toSource_impl(JSContext *cx, CallArgs args)

 {

     HandleValue thisv = args.thisv();

     JS_ASSERT(IsBoolean(thisv));

     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();

     StringBuffer sb(cx);

     if (!sb.append("(new Boolean(") || !BooleanToStringBuffer(b, sb) || !sb.append("))"))

         return false;

     JSString *str = sb.finishString();

     if (!str)

         return false;

     args.rval().setString(str);

     return true;

 }

 static bool

 bool_toSource(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsBoolean, bool_toSource_impl>(cx, args);

 }

 #endif

 MOZ_ALWAYS_INLINE bool

 bool_toString_impl(JSContext *cx, CallArgs args)

 {

     HandleValue thisv = args.thisv();

     JS_ASSERT(IsBoolean(thisv));

     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();

     args.rval().setString(js_BooleanToString(cx, b));

     return true;

 }

 static bool

 bool_toString(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsBoolean, bool_toString_impl>(cx, args);

 }

 MOZ_ALWAYS_INLINE bool

 bool_valueOf_impl(JSContext *cx, CallArgs args)

 {

     HandleValue thisv = args.thisv();

     JS_ASSERT(IsBoolean(thisv));

     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();

     args.rval().setBoolean(b);

     return true;

 }

 static bool

 bool_valueOf(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     return CallNonGenericMethod<IsBoolean, bool_valueOf_impl>(cx, args);

 }

 static const JSFunctionSpec boolean_methods[] = {

 #if JS_HAS_TOSOURCE

     JS_FN(js_toSource_str,  bool_toSource,  0, 0),

 #endif

     JS_FN(js_toString_str,  bool_toString,  0, 0),

     JS_FS_END

 };

 static bool

 Boolean(JSContext *cx, unsigned argc, Value *vp)

 {

     CallArgs args = CallArgsFromVp(argc, vp);

     bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;

     if (args.isConstructing()) {

         JSObject *obj = BooleanObject::create(cx, b);

         if (!obj)

             return false;

         args.rval().setObject(*obj);

     } else {

         args.rval().setBoolean(b);

     }

     return true;

 }

 JSObject *

 js_InitBooleanClass(JSContext *cx, HandleObject obj)

 {

     JS_ASSERT(obj->isNative());

     Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());

     RootedObject booleanProto (cx, global->createBlankPrototype(cx, &BooleanObject::class_));

     if (!booleanProto)

         return nullptr;

     booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT, BooleanValue(false));

     RootedFunction ctor(cx, global->createConstructor(cx, Boolean, cx->names().Boolean, 1));

     if (!ctor)

         return nullptr;

     if (!LinkConstructorAndPrototype(cx, ctor, booleanProto))

         return nullptr;

     if (!DefinePropertiesAndBrand(cx, booleanProto, nullptr, boolean_methods))

         return nullptr;

     Handle<PropertyName*> valueOfName = cx->names().valueOf;

     RootedFunction

         valueOf(cx, NewFunction(cx, NullPtr(), bool_valueOf, 0, JSFunction::NATIVE_FUN,

                                 global, valueOfName));

     if (!valueOf)

         return nullptr;

     RootedValue value(cx, ObjectValue(*valueOf));

     if (!JSObject::defineProperty(cx, booleanProto, valueOfName, value,

                                   JS_PropertyStub, JS_StrictPropertyStub, 0))

     {

         return nullptr;

     }

     if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_Boolean, ctor, booleanProto))

         return nullptr;

     return booleanProto;

 }

 JSString *

 js_BooleanToString(ExclusiveContext *cx, bool b)

 {

     return b ? cx->names().true_ : cx->names().false_;

 }

 JS_PUBLIC_API(bool)

 js::ToBooleanSlow(HandleValue v)

 {

     if (v.isString())

         return v.toString()->length() != 0;

     JS_ASSERT(v.isObject());

     return !EmulatesUndefined(&v.toObject());

 }

 /*

  * This slow path is only ever taken for proxies wrapping Boolean objects

  * The only caller of the fast path, JSON's PreprocessValue, ensures that.

  */

 bool

 js::BooleanGetPrimitiveValueSlow(HandleObject wrappedBool)

 {

     JSObject *obj = wrappedBool->as<ProxyObject>().target();

     JS_ASSERT(obj);

     return obj->as<BooleanObject>().unbox();

 }