Method GetDFA

extern/re2/re2/dfa.cc:1779–1806

}

DFA* Prog::GetDFA(MatchKind kind) {
  // For a forward DFA, half the memory goes to each DFA.
  // However, if it is a "many match" DFA, then there is
  // no counterpart with which the memory must be shared.
  //
  // For a reverse DFA, all the memory goes to the
  // "longest match" DFA, because RE2 never does reverse
  // "first match" searches.
  if (kind == kFirstMatch) {
    std::call_once(dfa_first_once_, [](Prog* prog) {
      prog->dfa_first_ = new DFA(prog, kFirstMatch, prog->dfa_mem_ / 2);
    }, this);
    return dfa_first_;
  } else if (kind == kManyMatch) {
    std::call_once(dfa_first_once_, [](Prog* prog) {
      prog->dfa_first_ = new DFA(prog, kManyMatch, prog->dfa_mem_);
    }, this);
    return dfa_first_;
  } else {
    std::call_once(dfa_longest_once_, [](Prog* prog) {
      if (!prog->reversed_)
        prog->dfa_longest_ = new DFA(prog, kLongestMatch, prog->dfa_mem_ / 2);
      else
        prog->dfa_longest_ = new DFA(prog, kLongestMatch, prog->dfa_mem_);
    }, this);
    return dfa_longest_;
  }
}

void Prog::DeleteDFA(DFA* dfa) {
  delete dfa;