Zig 0.17.0-dev (Split by item)

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testUtf8Peeking

unicode.testUtf8Peeking

fn testUtf8Peeking() !void

File

lib/std/unicode.zig:773

Code

fn testUtf8Peeking() !void {
    const s = Utf8View.initComptime("noël");
    var it = s.iterator();

    try testing.expect(mem.eql(u8, "n", it.nextCodepointSlice().?));

    try testing.expect(mem.eql(u8, "o", it.peek(1)));
    try testing.expect(mem.eql(u8, "oë", it.peek(2)));
    try testing.expect(mem.eql(u8, "oël", it.peek(3)));
    try testing.expect(mem.eql(u8, "oël", it.peek(4)));
    try testing.expect(mem.eql(u8, "oël", it.peek(10)));

    try testing.expect(mem.eql(u8, "o", it.nextCodepointSlice().?));
    try testing.expect(mem.eql(u8, "ë", it.nextCodepointSlice().?));
    try testing.expect(mem.eql(u8, "l", it.nextCodepointSlice().?));
    try testing.expect(it.nextCodepointSlice() == null);

    try testing.expect(mem.eql(u8, &[_]u8{}, it.peek(1)));
}