Method parseRightParen

java/com/google/re2j/Parser.java:1305–1331

()

  // parseRightParen handles a ')' in the input.
  private void parseRightParen() throws PatternSyntaxException {
    concat();
    if (swapVerticalBar()) {
      pop(); // pop vertical bar
    }
    alternate();

    int n = stack.size();
    if (n < 2) {
      throw new PatternSyntaxException(ERR_INTERNAL_ERROR, "stack underflow");
    }
    Regexp re1 = pop();
    Regexp re2 = pop();
    if (re2.op != Regexp.Op.LEFT_PAREN) {
      throw new PatternSyntaxException(ERR_MISSING_PAREN, wholeRegexp);
    }
    // Restore flags at time of paren.
    this.flags = re2.flags;
    if (re2.cap == 0) {
      // Just for grouping.
      push(re1);
    } else {
      re2.op = Regexp.Op.CAPTURE;
      re2.subs = new Regexp[] {re1};
      push(re2);
    }
  }

  // parseEscape parses an escape sequence at the beginning of s
  // and returns the rune.