Function nextCodepoint [src]
Prototype
pub fn nextCodepoint(it: *Utf16LeIterator) NextCodepointError!?u21 Parameters
it: *Utf16LeIterator Possible Errors
Source
pub fn nextCodepoint(it: *Utf16LeIterator) NextCodepointError!?u21 {
assert(it.i <= it.bytes.len);
if (it.i == it.bytes.len) return null;
var code_units: [2]u16 = undefined;
code_units[0] = mem.readInt(u16, it.bytes[it.i..][0..2], .little);
it.i += 2;
if (utf16IsHighSurrogate(code_units[0])) {
// surrogate pair
if (it.i >= it.bytes.len) return error.DanglingSurrogateHalf;
code_units[1] = mem.readInt(u16, it.bytes[it.i..][0..2], .little);
const codepoint = try utf16DecodeSurrogatePair(&code_units);
it.i += 2;
return codepoint;
} else if (utf16IsLowSurrogate(code_units[0])) {
return error.UnexpectedSecondSurrogateHalf;
} else {
return code_units[0];
}
}