s
at position pos
var b = new Buffer
b.append "美しい世界"
b.insert(" nit ", 3)
assert b == "美しい nit 世界"
redef fun insert(s, pos) do
assert pos >= 0 and pos <= length
if pos == length then
append s
return
end
var slen = s.byte_length
enlarge(byte_length + slen)
var it = _items
var shpos = it.char_to_byte_index(pos)
rshift_bytes(shpos, slen)
s.copy_to_native(it, slen, 0, shpos)
length += s.length
byte_length += slen
end
lib/core/text/flat.nit:937,2--951,4