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