protocolkit/poc-generators-2/hls.js

"use strict";

const { either, oneOrMore, EndOfInput } = require("./operations");
const Newline = require("./simple/lines/newline").LF;
const RestOfLine = require("./simple/lines/rest-of-line").LF;
const Integer = require("./simple/numeric/integer");
const Decimal = require("./simple/numeric/decimal");

function lastItem(array) {
	return array[array.length - 1];
}

function line(strings, ... parsers) {
	return function* () {
		let parserResults = [];
	
		for (let i = 0; i < strings.length - 1; i++) {
			yield strings[i];
			parserResults.push(yield parsers[i]);
		}
	
		yield lastItem(strings);
		yield Newline;
	
		return parserResults;
	}
}

function* Playlist() {
	return yield either([ MediaPlaylist ]);
}

function* MediaPlaylist() {
	yield line`#EXTM3U`;
	let [ targetDuration] = yield line`#EXT-X-TARGETDURATION:${Integer}`;
	yield Newline;

	let items = yield oneOrMore(function* () {
		let [ duration ] = yield line`#EXTINF:${Decimal},`;
		let url = yield RestOfLine;

		return { url, duration };
	});

	return { targetDuration, items };
}

module.exports = { Playlist };