Method match

ext/src/llvm/Regex.cpp:83–131

}

bool Regex::match(StringRef String, SmallVectorImpl<StringRef> *Matches,
                  std::string *Error) const {
  // Reset error, if given.
  if (Error && !Error->empty())
    *Error = "";

  // Check if the regex itself didn't successfully compile.
  if (Error ? !isValid(*Error) : !isValid())
    return false;

  unsigned nmatch = Matches ? preg->re_nsub+1 : 0;

  // pmatch needs to have at least one element.
  SmallVector<llvm_regmatch_t, 8> pm;
  pm.resize(nmatch > 0 ? nmatch : 1);
  pm[0].rm_so = 0;
  pm[0].rm_eo = String.size();

  int rc = llvm_regexec(preg, String.data(), nmatch, pm.data(), REG_STARTEND);

  // Failure to match is not an error, it's just a normal return value.
  // Any other error code is considered abnormal, and is logged in the Error.
  if (rc == REG_NOMATCH)
    return false;
  if (rc != 0) {
    if (Error)
      RegexErrorToString(error, preg, *Error);
    return false;
  }

  // There was a match.

  if (Matches) { // match position requested
    Matches->clear();

    for (unsigned i = 0; i != nmatch; ++i) {
      if (pm[i].rm_so == -1) {
        // this group didn't match
        Matches->push_back(StringRef());
        continue;
      }
      assert(pm[i].rm_eo >= pm[i].rm_so);
      Matches->push_back(StringRef(String.data()+pm[i].rm_so,
                                   pm[i].rm_eo-pm[i].rm_so));
    }
  }

  return true;
}

std::string Regex::sub(StringRef Repl, StringRef String,
                       std::string *Error) const {