Function parseBetween

docs/tests/v2/es6/js/sanddance.js:133147–133183

(s)

}

function parseBetween(s) {
  var n = s.length,
      i = 1,
      b,
      stream;
  i = find(s, i, RBRACK, LBRACK, RBRACK);

  if (i === n) {
    throw 'Empty between selector: ' + s;
  }

  b = parseMerge(s.substring(1, i));

  if (b.length !== 2) {
    throw 'Between selector must have two elements: ' + s;
  }

  s = s.slice(i + 1).trim();

  if (s[0] !== GT) {
    throw 'Expected \'>\' after between selector: ' + s;
  }

  b = b.map(parseSelector);
  stream = parseSelector(s.slice(1).trim());

  if (stream.between) {
    return {
      between: b,
      stream: stream
    };
  } else {
    stream.between = b;
  }

  return stream;
}

function parseStream(s) {
  var stream = {