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// SPDX-License-Identifier: MPL-2.0
// (c) Hare authors <https://harelang.org>
use strings;
// Returns true if a rune is a valid ASCII character.
export fn valid(c: rune) bool = c: u32 <= 0o177;
// Returns true if all runes in a string are valid ASCII characters.
export fn validstr(s: str) bool = {
const bytes = strings::toutf8(s);
for (let byte .. bytes) {
if (byte >= 0o200) {
return false;
};
};
return true;
};
@test fn valid() void = {
assert(valid('a') && valid('\0') && valid('\x7F'));
assert(!valid('\u0080') && !valid('こ'));
assert(validstr("abc\0"));
assert(!validstr("š"));
assert(!validstr("こんにちは"));
assert(!validstr("ABCこんにちは"));
};
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