func initTestLog(t *testing.T, entries []testEntry) *log {
l := newLog()
for _, e := range entries {
r := runes.StringReader(e.str)
if err := l.append(e.seq, e.at, r); err != nil {
t.Fatalf("l.append(%v, %v, %q)=%v", e.seq, e.at, e.str, err)
}
}
return l
}
func (e change) do(ed *Editor, _ io.Writer) (addr, error) {
switch e.op {
case 'a':
e.a = e.a.Plus(Rune(0))
case 'i':
e.a = e.a.Minus(Rune(0))
}
at, err := e.a.where(ed)
if err != nil {
return addr{}, err
}
return at, pend(ed, at, runes.StringReader(e.str))
}