src/third_party/mozjs-45/js/src/builtin/WeakSet.js

/* 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/. */

// 23.4.3.1
function WeakSet_add(value) {
    // Steps 1-3.
    var S = this;
    if (!IsObject(S) || !IsWeakSet(S))
        return callFunction(CallWeakSetMethodIfWrapped, this, value, "WeakSet_add");

    // Step 4.,6.
    let entries = UnsafeGetReservedSlot(this, WEAKSET_MAP_SLOT);
    if (!entries)
        ThrowTypeError(JSMSG_INCOMPATIBLE_PROTO, "WeakSet", "add", typeof S);

    // Step 5.
    if (!IsObject(value))
        ThrowTypeError(JSMSG_NOT_NONNULL_OBJECT, DecompileArg(0, value));

    // Steps 7-8.
    callFunction(std_WeakMap_set, entries, value, true);

    // Step 8.
    return S;
}

// 23.4.3.2
function WeakSet_clear() {
    // Step 1-3.
    var S = this;
    if (!IsObject(S) || !IsWeakSet(S))
        return callFunction(CallWeakSetMethodIfWrapped, this, "WeakSet_clear");

    // Step 4.
    let entries = UnsafeGetReservedSlot(this, WEAKSET_MAP_SLOT);
    if (!entries)
        ThrowTypeError(JSMSG_INCOMPATIBLE_PROTO, "WeakSet", "clear", typeof S);

    // Step 5.
    callFunction(std_WeakMap_clear, entries);

    // Step 6.
    return undefined;
}

// 23.4.3.4
function WeakSet_delete(value) {
    // Steps 1-3.
    var S = this;
    if (!IsObject(S) || !IsWeakSet(S))
        return callFunction(CallWeakSetMethodIfWrapped, this, value, "WeakSet_delete");

    // Step 4.,6.
    let entries = UnsafeGetReservedSlot(this, WEAKSET_MAP_SLOT);
    if (!entries)
        ThrowTypeError(JSMSG_INCOMPATIBLE_PROTO, "WeakSet", "delete", typeof S);

    // Step 5.
    if (!IsObject(value))
        return false;

    // Steps 7-8.
    return callFunction(std_WeakMap_delete, entries, value);
}

// 23.4.3.5
function WeakSet_has(value) {
    // Steps 1-3.
    var S = this;
    if (!IsObject(S) || !IsWeakSet(S))
        return callFunction(CallWeakSetMethodIfWrapped, this, value, "WeakSet_has");

    // Step 4-5.
    let entries = UnsafeGetReservedSlot(this, WEAKSET_MAP_SLOT);
    if (!entries)
        ThrowTypeError(JSMSG_INCOMPATIBLE_PROTO, "WeakSet", "has", typeof S);

    // Step 6.
    if (!IsObject(value))
        return false;

    // Steps 7-8.
    return callFunction(std_WeakMap_has, entries, value);
}