split method Null safety
Split lines
into individual lines.
If start
and end
are provided, only split the contents of
lines.substring(start, end)
. The start
and end
values must
specify a valid sub-range of lines
(0 <= start <= end <= lines.length
).
Implementation
static Iterable<String> split(String lines, [int start = 0, int? end]) sync* {
end = RangeError.checkValidRange(start, end, lines.length);
var sliceStart = start;
var char = 0;
for (var i = start; i < end; i++) {
var previousChar = char;
char = lines.codeUnitAt(i);
if (char != _CR) {
if (char != _LF) continue;
if (previousChar == _CR) {
sliceStart = i + 1;
continue;
}
}
yield lines.substring(sliceStart, i);
sliceStart = i + 1;
}
if (sliceStart < end) {
yield lines.substring(sliceStart, end);
}
}