Method CClass

extern/re2/re2/prefilter.cc:452–481

// Constructs Prefilter::Info for a character class.
typedef CharClass::iterator CCIter;
Prefilter::Info* Prefilter::Info::CClass(CharClass *cc,
                                         bool latin1) {
  if (ExtraDebug) {
    LOG(ERROR) << "CharClassInfo:";
    for (CCIter i = cc->begin(); i != cc->end(); ++i)
      LOG(ERROR) << "  " << i->lo << "-" << i->hi;
  }

  // If the class is too large, it's okay to overestimate.
  if (cc->size() > 10)
    return AnyCharOrAnyByte();

  Prefilter::Info *a = new Prefilter::Info();
  for (CCIter i = cc->begin(); i != cc->end(); ++i)
    for (Rune r = i->lo; r <= i->hi; r++) {
      if (latin1) {
        a->exact_.insert(RuneToStringLatin1(ToLowerRuneLatin1(r)));
      } else {
        a->exact_.insert(RuneToString(ToLowerRune(r)));
      }
    }


  a->is_exact_ = true;

  if (ExtraDebug)
    LOG(ERROR) << " = " << a->ToString();

  return a;
}

class Prefilter::Info::Walker : public Regexp::Walker<Prefilter::Info*> {
 public: