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<?php
/**
* League.Csv (https://csv.thephpleague.com)
*
* (c) Ignace Nyamagana Butera <[email protected]>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
declare(strict_types=1);
namespace League\Csv;
use CallbackFilterIterator;
use Generator;
use Iterator;
use JsonSerializable;
use LimitIterator;
use function array_flip;
use function array_search;
use function is_string;
use function iterator_count;
use function iterator_to_array;
/**
* Represents the result set of a {@link Reader} processed by a {@link Statement}.
*/
class ResultSet implements TabularDataReader, JsonSerializable
{
/** The CSV records collection. */
protected Iterator $records;
/** @var array<string> The CSV records collection header. */
protected array $header = [];
public function __construct(Iterator $records, array $header)
{
$this->validateHeader($header);
$this->records = $records;
$this->header = $header;
}
/**
* @throws SyntaxError if the header syntax is invalid
*/
protected function validateHeader(array $header): void
{
if ($header !== ($filtered_header = array_filter($header, 'is_string'))) {
throw SyntaxError::dueToInvalidHeaderColumnNames();
}
if ($header !== array_unique($filtered_header)) {
throw SyntaxError::dueToDuplicateHeaderColumnNames($header);
}
}
public function __destruct()
{
unset($this->records);
}
/**
* Returns a new instance from an object implementing the TabularDataReader interface.
*/
public static function createFromTabularDataReader(TabularDataReader $reader): self
{
return new self($reader->getRecords(), $reader->getHeader());
}
/**
* Returns the header associated with the result set.
*
* @return array<string>
*/
public function getHeader(): array
{
return $this->header;
}
public function getIterator(): Iterator
{
return $this->getRecords();
}
public function getRecords(array $header = []): Iterator
{
$this->validateHeader($header);
$records = $this->combineHeader($header);
foreach ($records as $offset => $value) {
yield $offset => $value;
}
}
/**
* Combine the header to each record if present.
*/
protected function combineHeader(array $header): Iterator
{
if ($header === $this->header || [] === $header) {
return $this->records;
}
$field_count = count($header);
$mapper = static function (array $record) use ($header, $field_count): array {
if (count($record) != $field_count) {
$record = array_slice(array_pad($record, $field_count, null), 0, $field_count);
}
/** @var array<string|null> $assocRecord */
$assocRecord = array_combine($header, $record);
return $assocRecord;
};
return new MapIterator($this->records, $mapper);
}
public function count(): int
{
return iterator_count($this->records);
}
public function jsonSerialize(): array
{
return iterator_to_array($this->records, false);
}
public function fetchOne(int $nth_record = 0): array
{
if ($nth_record < 0) {
throw InvalidArgument::dueToInvalidRecordOffset($nth_record, __METHOD__);
}
$iterator = new LimitIterator($this->records, $nth_record, 1);
$iterator->rewind();
$result = $iterator->current();
if (!is_array($result)) {
return [];
}
return $result;
}
/**
* @throws Exception
*/
public function fetchColumnByName(string $name): Iterator
{
return $this->yieldColumn(
$this->getColumnIndexByValue($name, 'name', __METHOD__)
);
}
/**
* @throws Exception
*/
public function fetchColumnByOffset(int $offset): Iterator
{
return $this->yieldColumn(
$this->getColumnIndexByKey($offset, 'offset', __METHOD__)
);
}
public function fetchColumn($index = 0): Iterator
{
return $this->yieldColumn(
$this->getColumnIndex($index, 'offset', __METHOD__)
);
}
/**
* @param string|int $offset
*/
protected function yieldColumn($offset): Generator
{
$iterator = new MapIterator(
new CallbackFilterIterator($this->records, fn (array $record): bool => isset($record[$offset])),
fn (array $record): string => $record[$offset]
);
foreach ($iterator as $key => $value) {
yield $key => $value;
}
}
/**
* Filter a column name against the header if any.
*
* @param string|int $field the field name or the field index
*
* @throws InvalidArgument if the field is invalid or not found
*
* @return string|int
*/
protected function getColumnIndex($field, string $type, string $method)
{
if (is_string($field)) {
return $this->getColumnIndexByValue($field, $type, $method);
}
return $this->getColumnIndexByKey($field, $type, $method);
}
/**
* Returns the selected column name.
*
* @throws InvalidArgument if the column is not found
*/
protected function getColumnIndexByValue(string $value, string $type, string $method): string
{
if (false === array_search($value, $this->header, true)) {
throw InvalidArgument::dueToInvalidColumnIndex($value, $type, $method);
}
return $value;
}
/**
* Returns the selected column name according to its offset.
*
* @throws InvalidArgument if the field is invalid or not found
*
* @return int|string
*/
protected function getColumnIndexByKey(int $index, string $type, string $method)
{
if ($index < 0) {
throw InvalidArgument::dueToInvalidColumnIndex($index, $type, $method);
}
if ([] === $this->header) {
return $index;
}
$value = array_search($index, array_flip($this->header), true);
if (false === $value) {
throw InvalidArgument::dueToInvalidColumnIndex($index, $type, $method);
}
return $value;
}
public function fetchPairs($offset_index = 0, $value_index = 1): Iterator
{
$offset = $this->getColumnIndex($offset_index, 'offset', __METHOD__);
$value = $this->getColumnIndex($value_index, 'value', __METHOD__);
$iterator = new MapIterator(
new CallbackFilterIterator($this->records, fn (array $record): bool => isset($record[$offset])),
fn (array $record): array => [$record[$offset], $record[$value] ?? null]
);
/** @var array{0:int|string, 1:string|null} $pair */
foreach ($iterator as $pair) {
yield $pair[0] => $pair[1];
}
}
}