File: jsbool.cpp

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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 "jstypes.h"

#include "jit/InlinableNatives.h"
#include "util/StringBuffer.h"
#include "vm/GlobalObject.h"
#include "vm/JSAtom.h"
#include "vm/JSContext.h"
#include "vm/JSObject.h"
#include "vm/ProxyObject.h"

#include "vm/BooleanObject-inl.h"

using namespace js;

const Class BooleanObject::class_ = {
    "Boolean",
    JSCLASS_HAS_RESERVED_SLOTS(1) | JSCLASS_HAS_CACHED_PROTO(JSProto_Boolean)};

MOZ_ALWAYS_INLINE bool IsBoolean(HandleValue v) {
  return v.isBoolean() || (v.isObject() && v.toObject().is<BooleanObject>());
}

MOZ_ALWAYS_INLINE bool bool_toSource_impl(JSContext* cx, const CallArgs& args) {
  HandleValue thisv = args.thisv();
  MOZ_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);
}

MOZ_ALWAYS_INLINE bool bool_toString_impl(JSContext* cx, const CallArgs& args) {
  HandleValue thisv = args.thisv();
  MOZ_ASSERT(IsBoolean(thisv));

  bool b = thisv.isBoolean() ? thisv.toBoolean()
                             : thisv.toObject().as<BooleanObject>().unbox();
  args.rval().setString(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, const CallArgs& args) {
  HandleValue thisv = args.thisv();
  MOZ_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[] = {
    JS_FN(js_toSource_str, bool_toSource, 0, 0),
    JS_FN(js_toString_str, bool_toString, 0, 0),
    JS_FN(js_valueOf_str, bool_valueOf, 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()) {
    RootedObject proto(cx);
    if (!GetPrototypeFromBuiltinConstructor(cx, args, &proto)) return false;

    JSObject* obj = BooleanObject::create(cx, b, proto);
    if (!obj) return false;
    args.rval().setObject(*obj);
  } else {
    args.rval().setBoolean(b);
  }
  return true;
}

JSObject* js::InitBooleanClass(JSContext* cx, HandleObject obj) {
  MOZ_ASSERT(obj->isNative());

  Handle<GlobalObject*> global = obj.as<GlobalObject>();

  Rooted<BooleanObject*> booleanProto(
      cx, GlobalObject::createBlankPrototype<BooleanObject>(cx, global));
  if (!booleanProto) return nullptr;
  booleanProto->setFixedSlot(BooleanObject::PRIMITIVE_VALUE_SLOT,
                             BooleanValue(false));

  RootedFunction ctor(cx, GlobalObject::createConstructor(
                              cx, Boolean, cx->names().Boolean, 1,
                              gc::AllocKind::FUNCTION, &jit::JitInfo_Boolean));
  if (!ctor) return nullptr;

  if (!LinkConstructorAndPrototype(cx, ctor, booleanProto)) return nullptr;

  if (!DefinePropertiesAndFunctions(cx, booleanProto, nullptr, boolean_methods))
    return nullptr;

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

  return booleanProto;
}

JSString* js::BooleanToString(JSContext* 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;

  MOZ_ASSERT(v.isObject());
  return !EmulatesUndefined(&v.toObject());
}