rust/src/test/run-pass/utf8_chars.rs

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Rust
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use std;
import str;
import vec;
fn main() {
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// Chars of 1, 2, 3, and 4 bytes
let chs: [char] = ['e', 'é', '€', 0x10000 as char];
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let s: str = str::from_chars(chs);
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assert (str::len(s) == 10u);
assert (str::char_len(s) == 4u);
assert (vec::len(str::chars(s)) == 4u);
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assert (str::eq(str::from_chars(str::chars(s)), s));
assert (str::char_at(s, 0u) == 'e');
assert (str::char_at(s, 1u) == 'é');
assert (str::is_utf8(str::bytes(s)));
assert (!str::is_utf8([0x80_u8]));
assert (!str::is_utf8([0xc0_u8]));
assert (!str::is_utf8([0xc0_u8, 0x10_u8]));
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let stack = "a×c€";
assert (str::pop_char(stack) == '€');
assert (str::pop_char(stack) == 'c');
str::push_char(stack, 'u');
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assert (str::eq(stack, "a×u"));
assert (str::shift_char(stack) == 'a');
assert (str::shift_char(stack) == '×');
str::unshift_char(stack, 'ß');
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assert (str::eq(stack, "ßu"));
}