Method parseInternal

java/com/google/re2j/Parser.java:792–986

()

  }

  private Regexp parseInternal() throws PatternSyntaxException {
    if ((flags & RE2.LITERAL) != 0) {
      // Trivial parser for literal string.
      return literalRegexp(wholeRegexp, flags);
    }

    // Otherwise, must do real work.
    int lastRepeatPos = -1, min = -1, max = -1;
    StringIterator t = new StringIterator(wholeRegexp);
    while (t.more()) {
      int repeatPos = -1;
      bigswitch:
      switch (t.peek()) {
        default:
          literal(t.pop());
          break;

        case '(':
          if ((flags & RE2.PERL_X) != 0 && t.lookingAt("(?")) {
            // Flag changes and non-capturing groups.
            parsePerlFlags(t);
            break;
          }
          op(Regexp.Op.LEFT_PAREN).cap = ++numCap;
          t.skip(1); // '('
          break;

        case '|':
          parseVerticalBar();
          t.skip(1); // '|'
          break;

        case ')':
          parseRightParen();
          t.skip(1); // ')'
          break;

        case '^':
          if ((flags & RE2.ONE_LINE) != 0) {
            op(Regexp.Op.BEGIN_TEXT);
          } else {
            op(Regexp.Op.BEGIN_LINE);
          }
          t.skip(1); // '^'
          break;

        case '$':
          if ((flags & RE2.ONE_LINE) != 0) {
            op(Regexp.Op.END_TEXT).flags |= RE2.WAS_DOLLAR;
          } else {
            op(Regexp.Op.END_LINE);
          }
          t.skip(1); // '$'
          break;

        case '.':
          if ((flags & RE2.DOT_NL) != 0) {
            op(Regexp.Op.ANY_CHAR);