50 lines
1.7 KiB
TypeScript
50 lines
1.7 KiB
TypeScript
/*
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Copyright 2020, 2021 The Matrix.org Foundation C.I.C.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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/**
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* Get the values for an enum.
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* @param e The enum.
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* @returns The enum values.
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*/
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export function getEnumValues(e: any): (string | number)[] {
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// String-based enums will simply be objects ({Key: "value"}), but number-based
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// enums will instead map themselves twice: in one direction for {Key: 12} and
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// the reverse for easy lookup, presumably ({12: Key}). In the reverse mapping,
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// the key is a string, not a number.
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//
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// For this reason, we try to determine what kind of enum we're dealing with.
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const keys = Object.keys(e);
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const values: (string | number)[] = [];
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for (const key of keys) {
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const value = e[key];
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if (Number.isFinite(value) || e[value.toString()] !== Number(key)) {
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values.push(value);
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}
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}
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return values;
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}
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/**
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* Determines if a given value is a valid value for the provided enum.
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* @param e The enum to check against.
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* @param val The value to search for.
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* @returns True if the enum contains the value.
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*/
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export function isEnumValue<T>(e: T, val: string | number): boolean {
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return getEnumValues(e).includes(val);
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}
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