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var Marker = require('../tokenizer/marker');

function split(value, separator) {
  var openLevel = Marker.OPEN_ROUND_BRACKET;
  var closeLevel = Marker.CLOSE_ROUND_BRACKET;
  var level = 0;
  var cursor = 0;
  var lastStart = 0;
  var lastValue;
  var lastCharacter;
  var len = value.length;
  var parts = [];

  if (value.indexOf(separator) == -1) {
    return [value];
  }

  if (value.indexOf(openLevel) == -1) {
    return value.split(separator);
  }

  while (cursor < len) {
    if (value[cursor] == openLevel) {
      level++;
    } else if (value[cursor] == closeLevel) {
      level--;
    }

    if (level === 0 && cursor > 0 && cursor + 1 < len && value[cursor] == separator) {
      parts.push(value.substring(lastStart, cursor));
      lastStart = cursor + 1;
    }

    cursor++;
  }

  if (lastStart < cursor + 1) {
    lastValue = value.substring(lastStart);
    lastCharacter = lastValue[lastValue.length - 1];
    if (lastCharacter == separator) {
      lastValue = lastValue.substring(0, lastValue.length - 1);
    }

    parts.push(lastValue);
  }

  return parts;
}

module.exports = split;