func (a *Action) insert(buf *Buffer) {
var data_chunk []byte
nline := 0
offset := a.Cursor.Boffset
line := a.Cursor.Line
utils.IterLines(a.Data, func(data []byte) {
if data[0] == '\n' {
buf.numBytes++
if offset < line.Len() {
// a case where we insert at the middle of the
// line, need to save that chunk for later
// insertion at the end of the operation
data_chunk = line.Data[offset:]
line.Data = line.Data[:offset]
}
// insert a line
buf.InsertLine(a.Lines[nline], line)
line = a.Lines[nline]
nline++
offset = 0
} else {
buf.numBytes += len(data)
// insert a chunk of data
line.Data = utils.InsertBytes(line.Data, offset, data)
offset += len(data)
}
})
if data_chunk != nil {
line.Data = append(line.Data, data_chunk...)
}
buf.Emit(BufferEvent{Type: BufferEventInsert, Action: a})
}
func (a *Action) delete(buf *Buffer) {
nline := 0
offset := a.Cursor.Boffset
line := a.Cursor.Line
utils.IterLines(a.Data, func(data []byte) {
if data[0] == '\n' {
buf.numBytes--
// append the contents of the deleted line the current line
line.Data = append(line.Data, a.Lines[nline].Data...)
// delete a line
buf.DeleteLine(a.Lines[nline])
nline++
} else {
buf.numBytes -= len(data)
// delete a chunk of data
copy(line.Data[offset:], line.Data[offset+len(data):])
line.Data = line.Data[:line.Len()-len(data)]
}
})
buf.Emit(BufferEvent{Type: BufferEventDelete, Action: a})
}