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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 | 1x 1x 1x 1x 1x | /* * Source: https://github.com/mozilla/vtt.js/blob/master/dist/vtt.js#L1716 */ import VTTCue from './vttcue'; const StringDecoder = function StringDecoder () { return { decode: function (data) { if (!data) return ''; if (typeof data !== 'string') throw new Error('Error - expected string data.'); return decodeURIComponent(encodeURIComponent(data)); } }; }; function VTTParser () { this.window = window; this.state = 'INITIAL'; this.buffer = ''; this.decoder = new StringDecoder(); this.regionList = []; } // Try to parse input as a time stamp. function parseTimeStamp (input) { function computeSeconds (h, m, s, f) { return (h | 0) * 3600 + (m | 0) * 60 + (s | 0) + (f | 0) / 1000; } let m = input.match(/^(\d+):(\d{2})(:\d{2})?\.(\d{3})/); if (!m) return null; if (m[3]) { // Timestamp takes the form of [hours]:[minutes]:[seconds].[milliseconds] return computeSeconds(m[1], m[2], m[3].replace(':', ''), m[4]); } else if (m[1] > 59) { // Timestamp takes the form of [hours]:[minutes].[milliseconds] // First position is hours as it's over 59. return computeSeconds(m[1], m[2], 0, m[4]); } else { // Timestamp takes the form of [minutes]:[seconds].[milliseconds] return computeSeconds(0, m[1], m[2], m[4]); } } // A settings object holds key/value pairs and will ignore anything but the first // assignment to a specific key. function Settings () { this.values = Object.create(null); } Settings.prototype = { // Only accept the first assignment to any key. set: function (k, v) { if (!this.get(k) && v !== '') this.values[k] = v; }, // Return the value for a key, or a default value. // If 'defaultKey' is passed then 'dflt' is assumed to be an object with // a number of possible default values as properties where 'defaultKey' is // the key of the property that will be chosen; otherwise it's assumed to be // a single value. get: function (k, dflt, defaultKey) { if (defaultKey) return this.has(k) ? this.values[k] : dflt[defaultKey]; return this.has(k) ? this.values[k] : dflt; }, // Check whether we have a value for a key. has: function (k) { return k in this.values; }, // Accept a setting if its one of the given alternatives. alt: function (k, v, a) { for (let n = 0; n < a.length; ++n) { if (v === a[n]) { this.set(k, v); break; } } }, // Accept a setting if its a valid (signed) integer. integer: function (k, v) { if (/^-?\d+$/.test(v)) { // integer this.set(k, parseInt(v, 10)); } }, // Accept a setting if its a valid percentage. percent: function (k, v) { let m; if ((m = v.match(/^([\d]{1,3})(\.[\d]*)?%$/))) { v = parseFloat(v); if (v >= 0 && v <= 100) { this.set(k, v); return true; } } return false; } }; // Helper function to parse input into groups separated by 'groupDelim', and // interprete each group as a key/value pair separated by 'keyValueDelim'. function parseOptions (input, callback, keyValueDelim, groupDelim) { let groups = groupDelim ? input.split(groupDelim) : [input]; for (let i in groups) { if (typeof groups[i] !== 'string') continue; let kv = groups[i].split(keyValueDelim); if (kv.length !== 2) continue; let k = kv[0]; let v = kv[1]; callback(k, v); } } let defaults = new VTTCue(0, 0, 0); // 'middle' was changed to 'center' in the spec: https://github.com/w3c/webvtt/pull/244 // Safari doesn't yet support this change, but FF and Chrome do. let center = defaults.align === 'middle' ? 'middle' : 'center'; function parseCue (input, cue, regionList) { // Remember the original input if we need to throw an error. let oInput = input; // 4.1 WebVTT timestamp function consumeTimeStamp () { let ts = parseTimeStamp(input); if (ts === null) throw new Error('Malformed timestamp: ' + oInput); // Remove time stamp from input. input = input.replace(/^[^\sa-zA-Z-]+/, ''); return ts; } // 4.4.2 WebVTT cue settings function consumeCueSettings (input, cue) { let settings = new Settings(); parseOptions(input, function (k, v) { switch (k) { case 'region': // Find the last region we parsed with the same region id. for (let i = regionList.length - 1; i >= 0; i--) { if (regionList[i].id === v) { settings.set(k, regionList[i].region); break; } } break; case 'vertical': settings.alt(k, v, ['rl', 'lr']); break; case 'line': var vals = v.split(','), vals0 = vals[0]; settings.integer(k, vals0); if (settings.percent(k, vals0)) settings.set('snapToLines', false); settings.alt(k, vals0, ['auto']); if (vals.length === 2) settings.alt('lineAlign', vals[1], ['start', center, 'end']); break; case 'position': vals = v.split(','); settings.percent(k, vals[0]); if (vals.length === 2) settings.alt('positionAlign', vals[1], ['start', center, 'end', 'line-left', 'line-right', 'auto']); break; case 'size': settings.percent(k, v); break; case 'align': settings.alt(k, v, ['start', center, 'end', 'left', 'right']); break; } }, /:/, /\s/); // Apply default values for any missing fields. cue.region = settings.get('region', null); cue.vertical = settings.get('vertical', ''); let line = settings.get('line', 'auto'); if (line === 'auto' && defaults.line === -1) { // set numeric line number for Safari line = -1; } cue.line = line; cue.lineAlign = settings.get('lineAlign', 'start'); cue.snapToLines = settings.get('snapToLines', true); cue.size = settings.get('size', 100); cue.align = settings.get('align', center); let position = settings.get('position', 'auto'); if (position === 'auto' && defaults.position === 50) { // set numeric position for Safari position = cue.align === 'start' || cue.align === 'left' ? 0 : cue.align === 'end' || cue.align === 'right' ? 100 : 50; } cue.position = position; } function skipWhitespace () { input = input.replace(/^\s+/, ''); } // 4.1 WebVTT cue timings. skipWhitespace(); cue.startTime = consumeTimeStamp(); // (1) collect cue start time skipWhitespace(); if (input.substr(0, 3) !== '-->') { // (3) next characters must match '-->' throw new Error('Malformed time stamp (time stamps must be separated by \'-->\'): ' + oInput); } input = input.substr(3); skipWhitespace(); cue.endTime = consumeTimeStamp(); // (5) collect cue end time // 4.1 WebVTT cue settings list. skipWhitespace(); consumeCueSettings(input, cue); } function fixLineBreaks (input) { return input.replace(/<br(?: \/)?>/gi, '\n'); } VTTParser.prototype = { parse: function (data) { let self = this; // If there is no data then we won't decode it, but will just try to parse // whatever is in buffer already. This may occur in circumstances, for // example when flush() is called. if (data) { // Try to decode the data that we received. self.buffer += self.decoder.decode(data, { stream: true }); } function collectNextLine () { let buffer = self.buffer; let pos = 0; buffer = fixLineBreaks(buffer); while (pos < buffer.length && buffer[pos] !== '\r' && buffer[pos] !== '\n') ++pos; let line = buffer.substr(0, pos); // Advance the buffer early in case we fail below. if (buffer[pos] === '\r') ++pos; if (buffer[pos] === '\n') ++pos; self.buffer = buffer.substr(pos); return line; } // 3.2 WebVTT metadata header syntax function parseHeader (input) { parseOptions(input, function (k, v) { switch (k) { case 'Region': // 3.3 WebVTT region metadata header syntax console.log('parse region', v); // parseRegion(v); break; } }, /:/); } // 5.1 WebVTT file parsing. try { let line; if (self.state === 'INITIAL') { // We can't start parsing until we have the first line. if (!/\r\n|\n/.test(self.buffer)) return this; line = collectNextLine(); // strip of UTF-8 BOM if any // https://en.wikipedia.org/wiki/Byte_order_mark#UTF-8 let m = line.match(/^()?WEBVTT([ \t].*)?$/); if (!m || !m[0]) throw new Error('Malformed WebVTT signature.'); self.state = 'HEADER'; } let alreadyCollectedLine = false; while (self.buffer) { // We can't parse a line until we have the full line. if (!/\r\n|\n/.test(self.buffer)) return this; if (!alreadyCollectedLine) line = collectNextLine(); else alreadyCollectedLine = false; switch (self.state) { case 'HEADER': // 13-18 - Allow a header (metadata) under the WEBVTT line. if (/:/.test(line)) { parseHeader(line); } else if (!line) { // An empty line terminates the header and starts the body (cues). self.state = 'ID'; } continue; case 'NOTE': // Ignore NOTE blocks. if (!line) self.state = 'ID'; continue; case 'ID': // Check for the start of NOTE blocks. if (/^NOTE($|[ \t])/.test(line)) { self.state = 'NOTE'; break; } // 19-29 - Allow any number of line terminators, then initialize new cue values. if (!line) continue; self.cue = new VTTCue(0, 0, ''); self.state = 'CUE'; // 30-39 - Check if self line contains an optional identifier or timing data. if (line.indexOf('-->') === -1) { self.cue.id = line; continue; } // Process line as start of a cue. /* falls through */ case 'CUE': // 40 - Collect cue timings and settings. try { parseCue(line, self.cue, self.regionList); } catch (e) { // In case of an error ignore rest of the cue. self.cue = null; self.state = 'BADCUE'; continue; } self.state = 'CUETEXT'; continue; case 'CUETEXT': var hasSubstring = line.indexOf('-->') !== -1; // 34 - If we have an empty line then report the cue. // 35 - If we have the special substring '-->' then report the cue, // but do not collect the line as we need to process the current // one as a new cue. if (!line || hasSubstring && (alreadyCollectedLine = true)) { // We are done parsing self cue. if (self.oncue) self.oncue(self.cue); self.cue = null; self.state = 'ID'; continue; } if (self.cue.text) self.cue.text += '\n'; self.cue.text += line; continue; case 'BADCUE': // BADCUE // 54-62 - Collect and discard the remaining cue. if (!line) self.state = 'ID'; continue; } } } catch (e) { // If we are currently parsing a cue, report what we have. if (self.state === 'CUETEXT' && self.cue && self.oncue) self.oncue(self.cue); self.cue = null; // Enter BADWEBVTT state if header was not parsed correctly otherwise // another exception occurred so enter BADCUE state. self.state = self.state === 'INITIAL' ? 'BADWEBVTT' : 'BADCUE'; } return this; }, flush: function () { let self = this; try { // Finish decoding the stream. self.buffer += self.decoder.decode(); // Synthesize the end of the current cue or region. if (self.cue || self.state === 'HEADER') { self.buffer += '\n\n'; self.parse(); } // If we've flushed, parsed, and we're still on the INITIAL state then // that means we don't have enough of the stream to parse the first // line. if (self.state === 'INITIAL') throw new Error('Malformed WebVTT signature.'); } catch (e) { throw e; } if (self.onflush) self.onflush(); return this; } }; export { fixLineBreaks }; export default VTTParser; |