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VTTParser.prototype = {
  parse: function parse(data) {
    var 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() {
      var buffer = self.buffer;
      var pos = 0;

      buffer = fixLineBreaks(buffer);

      while (pos < buffer.length && buffer[pos] !== '\r' && buffer[pos] !== '\n') {
        ++pos;
      }

      var 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 {
      var line = void 0;
      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
        var m = line.match(/^()?WEBVTT([ \t].*)?$/);
        if (!m || !m[0]) {
          throw new Error('Malformed WebVTT signature.');
        }

        self.state = 'HEADER';
      }

      var 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':