Method cleanAlt

java/com/google/re2j/Parser.java:297–312

(Regexp re)

  // cleanAlt cleans re for eventual inclusion in an alternation.
  private void cleanAlt(Regexp re) {
    if (re.op == Regexp.Op.CHAR_CLASS) {
      re.runes = new CharClass(re.runes).cleanClass().toArray();
      if (re.runes.length == 2 && re.runes[0] == 0 && re.runes[1] == Unicode.MAX_RUNE) {
        re.runes = null;
        re.op = Regexp.Op.ANY_CHAR;
      } else if (re.runes.length == 4
          && re.runes[0] == 0
          && re.runes[1] == '\n' - 1
          && re.runes[2] == '\n' + 1
          && re.runes[3] == Unicode.MAX_RUNE) {
        re.runes = null;
        re.op = Regexp.Op.ANY_CHAR_NOT_NL;
      }
    }
  }

  // collapse returns the result of applying op to subs[start:end].
  // If (sub contains op nodes, they all get hoisted up