#include "cmValue.h"

#include <ostream>

#include <string>

#include <cmext/string_view>

#include "cmStringAlgorithms.h"

namespace {

std::string True{ "1" };

std::string False{ "0" };

}

cmValue cmValue::True{ ::True };

cmValue cmValue::False{ ::False };

std::string cmValue::Empty;

bool cmValue::IsOn(cm::string_view value) noexcept

{

  switch (value.size()) {

    case 1:

      return value[0] == '1' || value[0] == 'Y' || value[0] == 'y';

    case 2:

      return                                    //

        (value[0] == 'O' || value[0] == 'o') && //

        (value[1] == 'N' || value[1] == 'n');

    case 3:

      return                                    //

        (value[0] == 'Y' || value[0] == 'y') && //

        (value[1] == 'E' || value[1] == 'e') && //

        (value[2] == 'S' || value[2] == 's');

    case 4:

      return                                    //

        (value[0] == 'T' || value[0] == 't') && //

        (value[1] == 'R' || value[1] == 'r') && //

        (value[2] == 'U' || value[2] == 'u') && //

        (value[3] == 'E' || value[3] == 'e');

    default:

      break;

  }

  return false;

}

bool cmValue::IsOff(cm::string_view value) noexcept

{

  switch (value.size()) {

    case 0:

      return true;

    case 1:

      return value[0] == '0' || value[0] == 'N' || value[0] == 'n';

    case 2:

      return                                    //

        (value[0] == 'N' || value[0] == 'n') && //

        (value[1] == 'O' || value[1] == 'o');

    case 3:

      return                                    //

        (value[0] == 'O' || value[0] == 'o') && //

        (value[1] == 'F' || value[1] == 'f') && //

        (value[2] == 'F' || value[2] == 'f');

    case 5:

      return                                    //

        (value[0] == 'F' || value[0] == 'f') && //

        (value[1] == 'A' || value[1] == 'a') && //

        (value[2] == 'L' || value[2] == 'l') && //

        (value[3] == 'S' || value[3] == 's') && //

        (value[4] == 'E' || value[4] == 'e');

    case 6:

      return                                    //

        (value[0] == 'I' || value[0] == 'i') && //

        (value[1] == 'G' || value[1] == 'g') && //

        (value[2] == 'N' || value[2] == 'n') && //

        (value[3] == 'O' || value[3] == 'o') && //

        (value[4] == 'R' || value[4] == 'r') && //

        (value[5] == 'E' || value[5] == 'e');

    default:

      break;

  }

  return IsNOTFOUND(value);

}

bool cmValue::IsNOTFOUND(cm::string_view value) noexcept

{

  return (value == "NOTFOUND"_s) || cmHasSuffix(value, "-NOTFOUND"_s);

}

bool cmValue::IsInternallyOn(cm::string_view value) noexcept

{

  return (value.size() == 4) &&             //

    (value[0] == 'I' || value[0] == 'i') && //

    (value[1] == '_') &&                    //

    (value[2] == 'O' || value[2] == 'o') && //

    (value[3] == 'N' || value[3] == 'n');

}

int cmValue::Compare(cmValue value) const noexcept

{

  if (!this->Value && !value) {

    return 0;

  }

  if (!this->Value) {

    return -1;

  }

  if (!value) {

    return 1;

  }

  return this->Value->compare(*value);

}

int cmValue::Compare(cm::string_view value) const noexcept

{

  if (!this->Value && !value.data()) {

    return 0;

  }

  if (!this->Value) {

    return -1;

  }

  if (!value.data()) {

    return 1;

  }

  return cm::string_view(*this->Value).compare(value);

}

std::ostream& operator<<(std::ostream& o, cmValue v)

{

  o << *v;

  return o;

}