76 lines
2.2 KiB
TypeScript
76 lines
2.2 KiB
TypeScript
type Entries = { [name: string]: string };
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export type SearchJSON = {
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default: string;
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engines: { [key: string]: string };
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};
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export default class Search {
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constructor(
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public defaultEngine: string,
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public engines: Entries,
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) {
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}
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static fromJSON(json: any): Search {
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let defaultEngine = Search.getStringField(json, 'default');
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let engines = Search.getObjectField(json, 'engines');
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for (let [name, url] of Object.entries(engines)) {
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if ((/\s/).test(name)) {
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throw new TypeError(
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`While space in the search engine not allowed: "${name}"`);
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}
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if (typeof url !== 'string') {
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throw new TypeError(
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`Invalid type of value in filed "engines": ${JSON.stringify(json)}`);
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}
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let matches = url.match(/{}/g);
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if (matches === null) {
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throw new TypeError(`No {}-placeholders in URL of "${name}"`);
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} else if (matches.length > 1) {
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throw new TypeError(`Multiple {}-placeholders in URL of "${name}"`);
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}
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}
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if (!Object.keys(engines).includes(defaultEngine)) {
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throw new TypeError(`Default engine "${defaultEngine}" not found`);
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}
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return new Search(
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json.default as string,
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json.engines,
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);
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}
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toJSON(): SearchJSON {
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return {
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default: this.defaultEngine,
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engines: this.engines,
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};
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}
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private static getStringField(json: any, name: string): string {
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if (!Object.prototype.hasOwnProperty.call(json, name)) {
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throw new TypeError(
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`missing field "${name}" on search: ${JSON.stringify(json)}`);
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}
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if (typeof json[name] !== 'string') {
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throw new TypeError(
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`invalid type of filed "${name}" on search: ${JSON.stringify(json)}`);
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}
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return json[name];
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}
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private static getObjectField(json: any, name: string): Object {
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if (!Object.prototype.hasOwnProperty.call(json, name)) {
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throw new TypeError(
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`missing field "${name}" on search: ${JSON.stringify(json)}`);
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}
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if (typeof json[name] !== 'object' || json[name] === null) {
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throw new TypeError(
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`invalid type of filed "${name}" on search: ${JSON.stringify(json)}`);
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}
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return json[name];
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}
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}
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