/**
* Compress a chain down to a single collection.
*
* @param bool $preserveKeys
*
* @return CollectionInterface
*/
public function compress($preserveKeys = true)
{
$compressed = new Collection();
foreach ($this->items as $item) {
$compressed->merge($item, $preserveKeys);
}
return $compressed;
}
public function pluck($offset, $count = 0)
{
$rows = new Collection();
foreach ($this->rows as $row) {
$counter = 0;
$newRow = [];
foreach ($row as $index => $cell) {
if ($index >= $offset && $index < $count + $offset) {
$newRow[] = $cell;
}
$counter++;
}
$rows->push($newRow);
}
return $rows;
}
public function read($offset = 0, $count = 0, $delimiter = null)
{
if (!$this->handle) {
throw new FileNotOpenException();
}
if (!$delimiter) {
$delimiter = $this->testDelimiters();
}
$rows = new Collection();
$counter = 0;
rewind($this->handle);
while (($data = fgetcsv($this->handle, self::READ_LENGTH, $delimiter, Komma::CSV_ENCLOSURE, Komma::CSV_ESCAPE)) !== false && (!$count || $counter < $count + $offset)) {
$counter++;
if ($counter >= $offset) {
$rows->push($data);
}
}
$this->rows = new Rows($rows);
return $this->rows;
}