Why whyyyyy?!!

/* ------- parsing ------- */

/**
 * Parses "@tag {type} name description"
 * @param {string} str Raw doc string
 * @param {Array[function]} parsers Array of parsers to be applied to the source
 * @returns {object} parsed tag node
 */
function parse_tag(str, parsers) {
  if (typeof str !== 'string' || str[0] !== '@') { return null; }

  var data = parsers.reduce(function(state, parser) {
    var result;

    try {
      result = parser(state.source, merge({}, state.data));
      // console.log('----------------');
      // console.log(parser.name, ':', result);
    } catch (err) {
      // console.warn('Parser "%s" failed: %s', parser.name, err.message);
      state.data.errors = (state.data.errors || [])
        .concat(parser.name + ': ' + err.message);
    }

    if (result) {
      state.source = state.source.slice(result.source.length);
      state.data   = merge(state.data, result.data);
    }

    return state;
  }, {
    source : str,
    data   : {}
  }).data;