// development first.

package unicode

var TurkishCase SpecialCase = _TurkishCase
var _TurkishCase = SpecialCase{
	CaseRange{0x0049, 0x0049, d{0, 0x131 - 0x49, 0}},
	CaseRange{0x0069, 0x0069, d{0x130 - 0x69, 0, 0x130 - 0x69}},
	CaseRange{0x0130, 0x0130, d{0, 0x69 - 0x130, 0}},
	CaseRange{0x0131, 0x0131, d{0x49 - 0x131, 0, 0x49 - 0x131}},
}

// The constant UpperLower has an otherwise impossible delta value.
type CaseRange struct {
	Lo    uint32
	Hi    uint32
	Delta d
}

// SpecialCase represents language-specific case mappings such as Turkish.
// Methods of SpecialCase customize (by overriding) the standard mappings.
type SpecialCase []CaseRange

// BUG(r): There is no mechanism for full case folding, that is, for
// characters that involve multiple runes in the input or output.

var Adlam <type 1>;
var Ahom <type 1>;
var Anatolian_Hieroglyphs <type 1>;
var Arabic <type 1>;
var Armenian <type 1>;
var Avestan <type 1>;
var AzeriCase <type 10 "SpecialCase" <type 11 [] <type 12 "CaseRange" <type 13 struct { Lo <type -7>; Hi <type -7>; Delta <type 14 ".unicode.d" <type 15 [3 ] <type -21>>>; }>>>
 func (special <type 10>) ToUpper (r <type -21>) <type -21>;

// upper case using the case mapping specified by c.
func ToUpperSpecial(c unicode.SpecialCase, s string) string {
	return Map(c.ToUpper, s)
}

// ToLowerSpecial returns a copy of the string s with all Unicode letters mapped to their
// lower case using the case mapping specified by c.
func ToLowerSpecial(c unicode.SpecialCase, s string) string {
	return Map(c.ToLower, s)
}

	// Issue 25636
	// no change for rune 'A', zero delta, under upper/lower/title case change.
	var noChangeForCapitalA = CaseRange{'A', 'A', [MaxCase]rune{0, 0, 0}}
	got := strings.ToLowerSpecial(SpecialCase([]CaseRange{noChangeForCapitalA}), "ABC")
	want := "Abc"
	if got != want {
		t.Errorf("got %q; want %q", got, want)
	}
}

func TestNegativeRune(t *testing.T) {
	// Issue 43254

		{"UnixMilli", Func, 17},
		{"Until", Func, 8},
		{"Wednesday", Const, 0},
		{"Weekday", Type, 0},
	},
	"unicode": {
		{"(SpecialCase).ToLower", Method, 0},
		{"(SpecialCase).ToTitle", Method, 0},
		{"(SpecialCase).ToUpper", Method, 0},
		{"ASCII_Hex_Digit", Var, 0},
		{"Adlam", Var, 7},
		{"Ahom", Var, 5},
		{"Anatolian_Hieroglyphs", Var, 5},
		{"Arabic", Var, 0},

pkg bytes, func ToLower([]uint8) []uint8
pkg bytes, func ToLowerSpecial(unicode.SpecialCase, []uint8) []uint8
pkg bytes, func ToTitle([]uint8) []uint8
pkg bytes, func ToTitleSpecial(unicode.SpecialCase, []uint8) []uint8
pkg bytes, func ToUpper([]uint8) []uint8
pkg bytes, func ToUpperSpecial(unicode.SpecialCase, []uint8) []uint8
pkg bytes, func Trim([]uint8, string) []uint8