import { Hash } from "@siteimprove/alfa-hash" ; import { Parser } from "@siteimprove/alfa-parser" ; import { Slice } from "@siteimprove/alfa-slice" ; import { Token } from "../syntax/token" ; import { Value } from "../value" ; const { map , right , either , left , delimited , option } = Parser ; /**
 *  https public export class URL extends Value < "url" > { public static of ( url ) { return new URL ( url ) ; } private readonly _url : string ; private constructor ( url ) { super ( ) ; this . _url = url ; } public get type ( ) : "url" { return "url" ; } public get url ( ) : string { return this . _url ; } public equals ( value ) { return value instanceof URL && value . _url === this . _url ; } public hash ( hash ) { hash . writeString ( this . _url ) ; } public toJSON ( ) { return { type : "url" , url : this . _url , } ; } public toString ( ) { return `url(${ this . _url })` ; } } public export namespace URL { export interface JSON extends Value . JSON < "url" > { url : string ; } export function isURL ( value ) { return value instanceof URL ; } /**
     *  https export const parse = map ( either ( Token . parseURL ( ) , right ( Token . parseFunction ( "url" ) , left ( delimited ( option ( Token . parseWhitespace ) , Token . parseString ( ) ) , Token . parseCloseParenthesis ) ) ) , ( url ) => URL . of ( url . value ) ) ; }