Method ParseCCCharacter

extern/re2/re2/parse.cc:1858–1874

Parses a character inside a character class. There are fewer special characters here than in the rest of the regexp. Sets *s to span the remainder of the string. Sets *rp to the character.

// Sets *s to span the remainder of the string.
// Sets *rp to the character.
bool Regexp::ParseState::ParseCCCharacter(StringPiece* s, Rune *rp,
                                          const StringPiece& whole_class,
                                          RegexpStatus* status) {
  if (s->empty()) {
    status->set_code(kRegexpMissingBracket);
    status->set_error_arg(whole_class);
    return false;
  }

  // Allow regular escape sequences even though
  // many need not be escaped in this context.
  if ((*s)[0] == '\\')
    return ParseEscape(s, rp, status, rune_max_);

  // Otherwise take the next rune.
  return StringPieceToRune(rp, s, status) >= 0;
}

// Parses a character class character, or, if the character
// is followed by a hyphen, parses a character class range.