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88 lines
2.1 KiB
JavaScript
88 lines
2.1 KiB
JavaScript
"use strict";
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const util = require("util");
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const errors = require("../errors");
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const createWrapper = require("../util/function-wrapper");
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const getValueType = require("../util/get-value-type");
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let proto = {
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_source: null,
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description: null,
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size: 0,
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add: null,
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[Symbol.iterator]: createWrapper(Symbol.iterator),
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[util.inspect.custom]: function () {
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return this.valueOf();
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},
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clear: function () {
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this._source.clear();
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this.size = 0;
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},
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entries: createWrapper("entries"),
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forEach: createWrapper("forEach"), /* FIXME: Prevent mutation from the third argument to forEach (which is the original set); maybe also needed for Map? */
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has: createWrapper("has"),
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keys: createWrapper("keys"),
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values: createWrapper("values"),
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toString: createWrapper("toString"),
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valueOf: createWrapper("valueOf"),
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delete: function (value) {
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let deleted = this._source.delete(value);
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this.size = this._source.size;
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if (deleted === false) {
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throw new errors.ValidationError("Tried to delete non-existent value from guarded set", {
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value: value,
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set: this._source
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});
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}
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}
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};
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module.exports = function createGuardedSet(set, guard, _, parent) {
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function generateSetSignatureError() {
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let wantedSignature = {
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_guardedCollectionType: "set",
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_itemType: guard._rule
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};
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return new errors.ValidationError(`Expected a Set or ${getValueType(wantedSignature)}, got ${getValueType(set)} instead`);
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}
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if (set._guardedCollectionType === "set") {
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if (guard === set._itemType) {
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return set;
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} else {
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throw generateSetSignatureError();
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}
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} else if (set instanceof Set) {
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function check(value) {
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let guardResult = guard.call(parent, value);
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if (guardResult === true) {
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return true;
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} else {
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throw guardResult;
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}
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}
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for (let value of set.values()) {
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check(value);
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}
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return Object.assign(Object.create(proto), {
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_source: set,
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_guardedCollectionType: "set",
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_itemType: guard,
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add: function (value) {
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if (check(value) === true) {
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this._source.add(value);
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this.size = this._source.size;
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}
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}
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});
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} else {
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throw generateSetSignatureError();
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}
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};
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