michael@0: /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*-
michael@0:  * vim: set ts=8 sts=4 et sw=4 tw=99:
michael@0:  * This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: /*
michael@0:  * JS boolean implementation.
michael@0:  */
michael@0: 
michael@0: #include "jsboolinlines.h"
michael@0: 
michael@0: #include "jsapi.h"
michael@0: #include "jsatom.h"
michael@0: #include "jscntxt.h"
michael@0: #include "jsobj.h"
michael@0: #include "jstypes.h"
michael@0: 
michael@0: #include "vm/GlobalObject.h"
michael@0: #include "vm/ProxyObject.h"
michael@0: #include "vm/StringBuffer.h"
michael@0: 
michael@0: #include "vm/BooleanObject-inl.h"
michael@0: 
michael@0: using namespace js;
michael@0: using namespace js::types;
michael@0: 
michael@0: const Class BooleanObject::class_ = {
michael@0:     "Boolean",
michael@0:     JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean),
michael@0:     JS_PropertyStub,         /* addProperty */
michael@0:     JS_DeletePropertyStub,   /* delProperty */
michael@0:     JS_PropertyStub,         /* getProperty */
michael@0:     JS_StrictPropertyStub,   /* setProperty */
michael@0:     JS_EnumerateStub,
michael@0:     JS_ResolveStub,
michael@0:     JS_ConvertStub
michael@0: };
michael@0: 
michael@0: MOZ_ALWAYS_INLINE bool
michael@0: IsBoolean(HandleValue v)
michael@0: {
michael@0:     return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());
michael@0: }
michael@0: 
michael@0: #if JS_HAS_TOSOURCE
michael@0: MOZ_ALWAYS_INLINE bool
michael@0: bool_toSource_impl(JSContext *cx, CallArgs args)
michael@0: {
michael@0:     HandleValue thisv = args.thisv();
michael@0:     JS_ASSERT(IsBoolean(thisv));
michael@0: 
michael@0:     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
michael@0: 
michael@0:     StringBuffer sb(cx);
michael@0:     if (!sb.append("(new Boolean(") || !BooleanToStringBuffer(b, sb) || !sb.append("))"))
michael@0:         return false;
michael@0: 
michael@0:     JSString *str = sb.finishString();
michael@0:     if (!str)
michael@0:         return false;
michael@0:     args.rval().setString(str);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: bool_toSource(JSContext *cx, unsigned argc, Value *vp)
michael@0: {
michael@0:     CallArgs args = CallArgsFromVp(argc, vp);
michael@0:     return CallNonGenericMethod<IsBoolean, bool_toSource_impl>(cx, args);
michael@0: }
michael@0: #endif
michael@0: 
michael@0: MOZ_ALWAYS_INLINE bool
michael@0: bool_toString_impl(JSContext *cx, CallArgs args)
michael@0: {
michael@0:     HandleValue thisv = args.thisv();
michael@0:     JS_ASSERT(IsBoolean(thisv));
michael@0: 
michael@0:     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
michael@0:     args.rval().setString(js_BooleanToString(cx, b));
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: bool_toString(JSContext *cx, unsigned argc, Value *vp)
michael@0: {
michael@0:     CallArgs args = CallArgsFromVp(argc, vp);
michael@0:     return CallNonGenericMethod<IsBoolean, bool_toString_impl>(cx, args);
michael@0: }
michael@0: 
michael@0: MOZ_ALWAYS_INLINE bool
michael@0: bool_valueOf_impl(JSContext *cx, CallArgs args)
michael@0: {
michael@0:     HandleValue thisv = args.thisv();
michael@0:     JS_ASSERT(IsBoolean(thisv));
michael@0: 
michael@0:     bool b = thisv.isBoolean() ? thisv.toBoolean() : thisv.toObject().as<BooleanObject>().unbox();
michael@0:     args.rval().setBoolean(b);
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: static bool
michael@0: bool_valueOf(JSContext *cx, unsigned argc, Value *vp)
michael@0: {
michael@0:     CallArgs args = CallArgsFromVp(argc, vp);
michael@0:     return CallNonGenericMethod<IsBoolean, bool_valueOf_impl>(cx, args);
michael@0: }
michael@0: 
michael@0: static const JSFunctionSpec boolean_methods[] = {
michael@0: #if JS_HAS_TOSOURCE
michael@0:     JS_FN(js_toSource_str,  bool_toSource,  0, 0),
michael@0: #endif
michael@0:     JS_FN(js_toString_str,  bool_toString,  0, 0),
michael@0:     JS_FS_END
michael@0: };
michael@0: 
michael@0: static bool
michael@0: Boolean(JSContext *cx, unsigned argc, Value *vp)
michael@0: {
michael@0:     CallArgs args = CallArgsFromVp(argc, vp);
michael@0: 
michael@0:     bool b = args.length() != 0 ? JS::ToBoolean(args[0]) : false;
michael@0: 
michael@0:     if (args.isConstructing()) {
michael@0:         JSObject *obj = BooleanObject::create(cx, b);
michael@0:         if (!obj)
michael@0:             return false;
michael@0:         args.rval().setObject(*obj);
michael@0:     } else {
michael@0:         args.rval().setBoolean(b);
michael@0:     }
michael@0:     return true;
michael@0: }
michael@0: 
michael@0: JSObject *
michael@0: js_InitBooleanClass(JSContext *cx, HandleObject obj)
michael@0: {
michael@0:     JS_ASSERT(obj->isNative());
michael@0: 
michael@0:     Rooted<GlobalObject*> global(cx, &obj->as<GlobalObject>());
michael@0: 
michael@0:     RootedObject booleanProto (cx, global->createBlankPrototype(cx, &BooleanObject::class_));
michael@0:     if (!booleanProto)
michael@0:         return nullptr;
michael@0:     booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT, BooleanValue(false));
michael@0: 
michael@0:     RootedFunction ctor(cx, global->createConstructor(cx, Boolean, cx->names().Boolean, 1));
michael@0:     if (!ctor)
michael@0:         return nullptr;
michael@0: 
michael@0:     if (!LinkConstructorAndPrototype(cx, ctor, booleanProto))
michael@0:         return nullptr;
michael@0: 
michael@0:     if (!DefinePropertiesAndBrand(cx, booleanProto, nullptr, boolean_methods))
michael@0:         return nullptr;
michael@0: 
michael@0:     Handle<PropertyName*> valueOfName = cx->names().valueOf;
michael@0:     RootedFunction
michael@0:         valueOf(cx, NewFunction(cx, NullPtr(), bool_valueOf, 0, JSFunction::NATIVE_FUN,
michael@0:                                 global, valueOfName));
michael@0:     if (!valueOf)
michael@0:         return nullptr;
michael@0: 
michael@0:     RootedValue value(cx, ObjectValue(*valueOf));
michael@0:     if (!JSObject::defineProperty(cx, booleanProto, valueOfName, value,
michael@0:                                   JS_PropertyStub, JS_StrictPropertyStub, 0))
michael@0:     {
michael@0:         return nullptr;
michael@0:     }
michael@0: 
michael@0:     if (!GlobalObject::initBuiltinConstructor(cx, global, JSProto_Boolean, ctor, booleanProto))
michael@0:         return nullptr;
michael@0: 
michael@0:     return booleanProto;
michael@0: }
michael@0: 
michael@0: JSString *
michael@0: js_BooleanToString(ExclusiveContext *cx, bool b)
michael@0: {
michael@0:     return b ? cx->names().true_ : cx->names().false_;
michael@0: }
michael@0: 
michael@0: JS_PUBLIC_API(bool)
michael@0: js::ToBooleanSlow(HandleValue v)
michael@0: {
michael@0:     if (v.isString())
michael@0:         return v.toString()->length() != 0;
michael@0: 
michael@0:     JS_ASSERT(v.isObject());
michael@0:     return !EmulatesUndefined(&v.toObject());
michael@0: }
michael@0: 
michael@0: /*
michael@0:  * This slow path is only ever taken for proxies wrapping Boolean objects
michael@0:  * The only caller of the fast path, JSON's PreprocessValue, ensures that.
michael@0:  */
michael@0: bool
michael@0: js::BooleanGetPrimitiveValueSlow(HandleObject wrappedBool)
michael@0: {
michael@0:     JSObject *obj = wrappedBool->as<ProxyObject>().target();
michael@0:     JS_ASSERT(obj);
michael@0:     return obj->as<BooleanObject>().unbox();
michael@0: }