// file      : tests/regex/driver.cxx -*- C++ -*-
// license   : MIT; see accompanying LICENSE file

#include <regex>
#include <string>
#include <utility>   // pair
#include <iostream>
#include <stdexcept> // invalid_argument
#include <exception>

#include <libbutl/regex.hxx>
#include <libbutl/utility.hxx> // operator<<(ostream, exception)

#undef NDEBUG
#include <cassert>

using namespace std;
using namespace butl;

// Usage: argv[0] [-ffo] [-fnc] [-m] <string> "/<regex>/<format>/"
//
// Perform substitution of matched substrings with formatted replacement
// strings using regex_replace_*() functions. If the string matches the regex
// then print the replacement to STDOUT and exit with zero code. Exit with
// code one if it doesn't match, and with code two on failure (print error
// description to STDERR).
//
// -ffo
//    Use format_first_only replacement flag.
//
// -fnc
//    Use format_no_copy replacement flag.
//
// -m
//    Match the entire string, rather than its sub-strings.
//
int
main (int argc, const char* argv[])
try
{
  regex_constants::match_flag_type fl (regex_constants::match_default);

  int i (1);
  bool match (false);
  for (; i != argc; ++i)
  {
    string op (argv[i]);

    if (op == "-ffo")
      fl |= regex_constants::format_first_only;
    else if (op == "-fnc")
      fl |= regex_constants::format_no_copy;
    else if (op == "-m")
      match = true;
    else
      break;
  }

  assert (i + 2 == argc);

  string s (argv[i++]);
  pair<regex, string> rf (regex_replace_parse (argv[i]));

  const regex&  re  (rf.first);
  const string& fmt (rf.second);

  auto r (match
          ? regex_replace_match (s, re, fmt)
          : regex_replace_search (s, re, fmt, fl));

  if (r.second)
    cout << r.first << endl;

  return r.second ? 0 : 1;
}
catch (const regex_error& e)
{
  cerr << "invalid regex" << e << endl; // Print sanitized.
  return 2;
}
catch (const invalid_argument& e)
{
  cerr << e << endl;
  return 2;
}
catch (const exception&)
{
  assert (false);
  return 2;
}