b38dea0597
Share Gaia assets and adapters, keep private profiles and development documents local, and update both public READMEs.
146 lines
3.2 KiB
JavaScript
Executable file
146 lines
3.2 KiB
JavaScript
Executable file
/* exported Playlist */
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/* m3u parsing. */
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/*
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* http://tools.ietf.org/html/draft-pantos-http-live-streaming-14
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* http://en.wikipedia.org/wiki/M3U
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* http://forums.winamp.com/showthread.php?threadid=65772
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* http://schworak.com/blog/e39/m3u-play-list-specification/
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*/
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'use strict';
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/*
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* API defined:
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* Playlist a class that encapsulate a playlist as well as its serialisation
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*
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* Constructor Playlist(path)
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*
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* Playlist.parse(path): contruct and parse a playlist from file.
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* Return a promise for it.
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*/
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function Playlist(path) {
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this._songs = [];
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this._directory = null;
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if (path) {
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this._directory = path;
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var idx = this._directory.lastIndexOf('/');
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if (idx !== -1) {
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this._directory = this._directory.slice(0, idx + 1);
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}
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}
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}
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Playlist.parse = function(path) {
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var promise = new Promise(
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function(resolve, reject) {
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var storage = navigator.getDeviceStorage('music');
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var request = storage.get(path);
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request.onsuccess = function() {
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var reader = new FileReader();
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var file = request.result;
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reader.readAsText(file);
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reader.onerror = function() {
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reject(new Error('Error reading: ' + path + ': ' + this.error));
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};
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reader.onload = function() {
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var pl = new Playlist(path);
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pl.fromString(reader.result);
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resolve(pl);
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};
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};
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request.onerror = function() {
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reject(new Error('Couldn\'t get path: ' + path + ': ' + this.error));
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};
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});
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return promise;
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};
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Playlist.isUrl = function(path) {
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var re = /^(https?|ftp|file|mms|rtmp):\//;
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return re.test(path);
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};
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Playlist.prototype = {
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get songs() {
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return this._songs;
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},
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get directory() {
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return this._directory;
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},
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// m3u state that path is either absolute or relative to the playlist
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_makeAbsolutePath: function(path) {
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if (!this._directory || Playlist.isUrl(path)) {
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return path;
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}
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if (path[0] === '/') {
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return path;
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}
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return this._directory + path;
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},
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/*
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* song is a path string.
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* index is the index to insert the song at. If -1 or undefined
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* song is added at the end if the array.
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*/
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addSong: function(song, index) {
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if (!song) {
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throw new Error('invalid');
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}
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var absPath = this._makeAbsolutePath(song);
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if (index === undefined || index === -1 || index >= this._songs.length) {
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this._songs.push(absPath);
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} else {
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this._songs.splice(index, 0, absPath);
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}
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},
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removeSong: function(path) {
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var absPath = this._makeAbsolutePath(path);
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var idx = this._songs.indexOf(absPath);
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if (idx != -1) {
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this._songs.splice(idx, 1);
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}
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},
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removeSongAt: function(index) {
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this._songs.splice(index, 1);
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},
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toString: function() {
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var content = '';
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content += '#EXTM3U\n';
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var entry;
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for (entry of this._songs) {
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content += entry + '\n';
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}
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return content;
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},
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fromString: function(content) {
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var lines = content.toString().split('\n');
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for (var i = 0; i < lines.length; i++){
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var line = lines[i].trim();
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if (line === '' || line.startsWith('#')) {
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continue;
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}
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this._songs.push(this._makeAbsolutePath(line));
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}
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}
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};
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