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// Copyright 2021 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package ascii
import (
"strings"
"unicode"
)
// EqualFold is [strings.EqualFold], ASCII only. It reports whether s and t
// are equal, ASCII-case-insensitively.
func EqualFold(s, t string) bool {
if len(s) != len(t) {
return false
}
for i := 0; i < len(s); i++ {
if lower(s[i]) != lower(t[i]) {
return false
}
}
return true
}
// lower returns the ASCII lowercase version of b.
func lower(b byte) byte {
if 'A' <= b && b <= 'Z' {
return b + ('a' - 'A')
}
return b
}
// IsPrint returns whether s is ASCII and printable according to
// https://tools.ietf.org/html/rfc20#section-4.2.
func IsPrint(s string) bool {
for i := 0; i < len(s); i++ {
if s[i] < ' ' || s[i] > '~' {
return false
}
}
return true
}
// Is returns whether s is ASCII.
func Is(s string) bool {
for i := 0; i < len(s); i++ {
if s[i] > unicode.MaxASCII {
return false
}
}
return true
}
// ToLower returns the lowercase version of s if s is ASCII and printable.
func ToLower(s string) (lower string, ok bool) {
if !IsPrint(s) {
return "", false
}
return strings.ToLower(s), true
}