Reader::seekRow() - Code Metrics - Inspection of "Improve PHPStan integration" - thephpleague/csv - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 3c5025...207be7 )

by ignace nyamagana

created 2018-02-23 12:57 UTC

Reader::seekRow() B

↳ Parent: Reader

Complexity

Conditions	5
Paths	3

Size

Total Lines	19
Code Lines	10

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	10
CRAP Score	5

Importance

Changes

Metric	Value
cc	5
eloc	10
nc	3
nop	1
dl	0
loc	19
ccs	10
cts	10
cp	1
crap	5
rs	8.8571
c	0
b	0
f	0

<?php
/**
* This file is part of the League.csv library
*
* @license http://opensource.org/licenses/MIT
* @link https://github.com/thephpleague/csv/
* @version 9.1.2
* @package League.csv
*
* 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 BadMethodCallException;
use CallbackFilterIterator;
use Countable;
use Iterator;
use IteratorAggregate;
use JsonSerializable;
use SplFileObject;
use TypeError;

/**
 * A class to select records from a CSV document
 *
 * @package League.csv
 * @since  3.0.0
 *
 * @method array fetchOne(int $nth_record = 0) Returns a single record from the CSV
 * @method Generator fetchColumn(string|int $column_index) Returns the next value from a single CSV record field
 * @method Generator fetchPairs(string|int $offset_index = 0, string|int $value_index = 1) Fetches the next key-value pairs from the CSV document
 */
class Reader extends AbstractCsv implements Countable, IteratorAggregate, JsonSerializable
{
    /**
     * header offset
     *
     * @var int|null
     */
    protected $header_offset;

    /**
     * header record
     *
     * @var string[]
     */
    protected $header = [];

    /**
     * records count
     *
     * @var int
     */
    protected $nb_records = -1;

    /**
     * {@inheritdoc}
     */
    protected $stream_filter_mode = STREAM_FILTER_READ;

    /**
     * {@inheritdoc}
     */
    public static function createFromPath(string $path, string $open_mode = 'r', $context = null): AbstractCsv
    {
        return new static(Stream::createFromPath($path, $open_mode, $context));
    }

    /**
     * Returns the header offset
     *
     * If no CSV header offset is set this method MUST return null
     *
     * @return int|null
     */
    public function getHeaderOffset()
    {
        return $this->header_offset;
    }

    /**
     * Returns the CSV record used as header
     *
     * The returned header is represented as an array of string values
     *
     * @return string[]
     */
    public function getHeader(): array
    {
        if (null === $this->header_offset) {
            return $this->header;
        }

        if (!empty($this->header)) {
            return $this->header;
        }

        $this->header = $this->setHeader($this->header_offset);

        return $this->header;
    }

    /**
     * Determine the CSV record header
     *
     * @param int $offset
     *
     * @throws Exception If the header offset is set and no record is found or is the empty array
     *
     * @return string[]
     */
    protected function setHeader(int $offset): array
    {
        $header = $this->seekRow($offset);
        if (empty($header)) {
            throw new Exception(sprintf('The header record does not exist or is empty at offset: `%s`', $offset));
        }

        if (0 === $offset) {
            return $this->removeBOM($header, mb_strlen($this->getInputBOM()), $this->enclosure);
        }

        return $header;
    }

    /**
     * Returns the row at a given offset
     *
     * @param int $offset
     *
     * @return mixed
     */
    protected function seekRow(int $offset)
    {
        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
        $this->document->rewind();

        //Workaround for SplFileObject::seek bug in PHP7.2+ see https://bugs.php.net/bug.php?id=75917
        if (PHP_VERSION_ID >= 70200 && !$this->document instanceof Stream) {
            while ($offset !== $this->document->key() && $this->document->valid()) {
                $this->document->next();
            }

            return $this->document->current();
        }

        $this->document->seek($offset);

        return $this->document->current();
    }

    /**
     * Strip the BOM sequence from a record
     *
     * @param string[] $record
     * @param int      $bom_length
     * @param string   $enclosure
     *
     * @return string[]
     */
    protected function removeBOM(array $record, int $bom_length, string $enclosure): array
    {
        if (0 == $bom_length) {
            return $record;
        }

        $record[0] = mb_substr($record[0], $bom_length);
        if ($enclosure.$enclosure != substr($record[0].$record[0], strlen($record[0]) - 1, 2)) {
            return $record;
        }

        $record[0] = substr($record[0], 1, -1);

        return $record;
    }

    /**
     * {@inheritdoc}
     */
    public function __call($method, array $arguments)
    {
        static $whitelisted = ['fetchColumn' => 1, 'fetchOne' => 1, 'fetchPairs' => 1];
        if (isset($whitelisted[$method])) {
            return (new ResultSet($this->getRecords(), $this->getHeader()))->$method(...$arguments);
        }

        throw new BadMethodCallException(sprintf('%s::%s() method does not exist', __CLASS__, $method));
    }

    /**
     * {@inheritdoc}
     */
    public function count(): int
    {
        if (-1 === $this->nb_records) {
            $this->nb_records = iterator_count($this->getRecords());
        }

        return $this->nb_records;
    }

    /**
     * {@inheritdoc}
     */
    public function getIterator(): Iterator
    {
        return $this->getRecords();
    }

    /**
     * {@inheritdoc}
     */
    public function jsonSerialize(): array
    {
        return iterator_to_array($this->getRecords(), false);
    }

    /**
     * Returns the CSV records as an iterator object.
     *
     * Each CSV record is represented as a simple array containig strings or null values.
     *
     * If the CSV document has a header record then each record is combined
     * to the header record and the header record is removed from the iterator.
     *
     * If the CSV document is inconsistent. Missing record fields are
     * filled with null values while extra record fields are strip from
     * the returned object.
     *
     * @param string[] $header an optional header to use instead of the CSV document header
     *
     * @return Iterator
     */
    public function getRecords(array $header = []): Iterator
    {
        $header = $this->computeHeader($header);
        $normalized = function ($record): bool {
            return is_array($record) && $record != [null];
        };
        $bom = $this->getInputBOM();
        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);

        $records = $this->stripBOM(new CallbackFilterIterator($this->document, $normalized), $bom);
        if (null !== $this->header_offset) {
            $records = new CallbackFilterIterator($records, function (array $record, int $offset): bool {
                return $offset !== $this->header_offset;
            });
        }

        return $this->combineHeader($records, $header);
    }

    /**
     * Returns the header to be used for iteration
     *
     * @param string[] $header
     *
     * @throws Exception If the header contains non unique column name
     *
     * @return string[]
     */
    protected function computeHeader(array $header)
    {
        if (empty($header)) {
            $header = $this->getHeader();
        }

        if ($header === array_unique(array_filter($header, 'is_string'))) {
            return $header;
        }

        throw new Exception('The header record must be empty or a flat array with unique string values');
    }

    /**
     * Combine the CSV header to each record if present
     *
     * @param Iterator $iterator
     * @param string[] $header
     *
     * @return Iterator
     */
    protected function combineHeader(Iterator $iterator, array $header): Iterator
    {
        if (empty($header)) {
            return $iterator;
        }

        $field_count = count($header);
        $mapper = 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);
            }

            return array_combine($header, $record);
        };

        return new MapIterator($iterator, $mapper);
    }

    /**
     * Strip the BOM sequence from the returned records if necessary
     *
     * @param Iterator $iterator
     * @param string   $bom
     *
     * @return Iterator
     */
    protected function stripBOM(Iterator $iterator, string $bom): Iterator
    {
        if ('' === $bom) {
            return $iterator;
        }

        $bom_length = mb_strlen($bom);
        $mapper = function (array $record, int $index) use ($bom_length): array {
            if (0 != $index) {
                return $record;
            }

            return $this->removeBOM($record, $bom_length, $this->enclosure);
        };

        return new MapIterator($iterator, $mapper);
    }

    /**
     * Selects the record to be used as the CSV header
     *
     * Because the header is represented as an array, to be valid
     * a header MUST contain only unique string value.
     *
     * @param int|null $offset the header record offset
     *
     * @throws Exception if the offset is a negative integer
     *
     * @return static
     */
    public function setHeaderOffset($offset): self
    {
        if ($offset === $this->header_offset) {
            return $this;
        }

        if (!is_nullable_int($offset)) {
            throw new TypeError(sprintf(__METHOD__.'() expects 1 Argument to be null or an integer %s given', gettype($offset)));
        }

        if (null !== $offset && 0 > $offset) {
            throw new Exception(__METHOD__.'() expects 1 Argument to be greater or equal to 0');
        }

        $this->header_offset = $offset;
        $this->resetProperties();

        return $this;
    }

    /**
     * {@inheritdoc}
     */
    protected function resetProperties()
    {
        $this->nb_records = -1;
        $this->header = [];
    }
}


1		<?php
2		/**
3		* This file is part of the League.csv library
4		*
5		* @license http://opensource.org/licenses/MIT
6		* @link https://github.com/thephpleague/csv/
7		* @version 9.1.2
8		* @package League.csv
9		*
10		* For the full copyright and license information, please view the LICENSE
11		* file that was distributed with this source code.
12		*/
13		declare(strict_types=1);
14
15		namespace League\Csv;
16
17		use BadMethodCallException;
18		use CallbackFilterIterator;
19		use Countable;
20		use Iterator;
21		use IteratorAggregate;
22		use JsonSerializable;
23		use SplFileObject;
24		use TypeError;
25
26		/**
27		* A class to select records from a CSV document
28		*
29		* @package League.csv
30		* @since 3.0.0
31		*
32		* @method array fetchOne(int $nth_record = 0) Returns a single record from the CSV
33		* @method Generator fetchColumn(string\|int $column_index) Returns the next value from a single CSV record field
34		* @method Generator fetchPairs(string\|int $offset_index = 0, string\|int $value_index = 1) Fetches the next key-value pairs from the CSV document
35		*/
36		class Reader extends AbstractCsv implements Countable, IteratorAggregate, JsonSerializable
37		{
38		/**
39		* header offset
40		*
41		* @var int\|null
42		*/
43		protected $header_offset;
44
45		/**
46		* header record
47		*
48		* @var string[]
49		*/
50		protected $header = [];
51
52		/**
53		* records count
54		*
55		* @var int
56		*/
57		protected $nb_records = -1;
58
59		/**
60		* {@inheritdoc}
61		*/
62		protected $stream_filter_mode = STREAM_FILTER_READ;
63
64		/**
65		* {@inheritdoc}
66		*/
67	2	public static function createFromPath(string $path, string $open_mode = 'r', $context = null): AbstractCsv
68		{
69	2	return new static(Stream::createFromPath($path, $open_mode, $context));
70		}
71
72		/**
73		* Returns the header offset
74		*
75		* If no CSV header offset is set this method MUST return null
76		*
77		* @return int\|null
78		*/
79	10	public function getHeaderOffset()
80		{
81	10	return $this->header_offset;
82		}
83
84		/**
85		* Returns the CSV record used as header
86		*
87		* The returned header is represented as an array of string values
88		*
89		* @return string[]
90		*/
91	10	public function getHeader(): array
92		{
93	10	if (null === $this->header_offset) {
94	8	return $this->header;
95		}
96
97	4	if (!empty($this->header)) {
98	2	return $this->header;
99		}
100
101	4	$this->header = $this->setHeader($this->header_offset);
102
103	4	return $this->header;
104		}
105
106		/**
107		* Determine the CSV record header
108		*
109		* @param int $offset
110		*
111		* @throws Exception If the header offset is set and no record is found or is the empty array
112		*
113		* @return string[]
114		*/
115	8	protected function setHeader(int $offset): array
116		{
117	8	$header = $this->seekRow($offset);
118	8	if (empty($header)) {
119	4	throw new Exception(sprintf('The header record does not exist or is empty at offset: `%s`', $offset));
120		}
121
122	4	if (0 === $offset) {
123	2	return $this->removeBOM($header, mb_strlen($this->getInputBOM()), $this->enclosure);
124		}
125
126	2	return $header;
127		}
128
129		/**
130		* Returns the row at a given offset
131		*
132		* @param int $offset
133		*
134		* @return mixed
135		*/
136	4	protected function seekRow(int $offset)
137		{
138	4	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
139	4	$this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
140	4	$this->document->rewind();
141
142		//Workaround for SplFileObject::seek bug in PHP7.2+ see https://bugs.php.net/bug.php?id=75917
143	4	if (PHP_VERSION_ID >= 70200 && !$this->document instanceof Stream) {
144	1	while ($offset !== $this->document->key() && $this->document->valid()) {
145	1	$this->document->next();
146		}
147
148	1	return $this->document->current();
149		}
150
151	3	$this->document->seek($offset);
152
153	3	return $this->document->current();
154		}
155
156		/**
157		* Strip the BOM sequence from a record
158		*
159		* @param string[] $record
160		* @param int $bom_length
161		* @param string $enclosure
162		*
163		* @return string[]
164		*/
165	8	protected function removeBOM(array $record, int $bom_length, string $enclosure): array
166		{
167	8	if (0 == $bom_length) {
168	2	return $record;
169		}
170
171	6	$record[0] = mb_substr($record[0], $bom_length);
172	6	if ($enclosure.$enclosure != substr($record[0].$record[0], strlen($record[0]) - 1, 2)) {
173	4	return $record;
174		}
175
176	2	$record[0] = substr($record[0], 1, -1);
177
178	2	return $record;
179		}
180
181		/**
182		* {@inheritdoc}
183		*/
184	6	public function __call($method, array $arguments)
185		{
186	6	static $whitelisted = ['fetchColumn' => 1, 'fetchOne' => 1, 'fetchPairs' => 1];
187	6	if (isset($whitelisted[$method])) {
188	2	return (new ResultSet($this->getRecords(), $this->getHeader()))->$method(...$arguments);
189		}
190
191	4	throw new BadMethodCallException(sprintf('%s::%s() method does not exist', __CLASS__, $method));
192		}
193
194		/**
195		* {@inheritdoc}
196		*/
197	2	public function count(): int
198		{
199	2	if (-1 === $this->nb_records) {
200	2	$this->nb_records = iterator_count($this->getRecords());
201		}
202
203	2	return $this->nb_records;
204		}
205
206		/**
207		* {@inheritdoc}
208		*/
209	2	public function getIterator(): Iterator
210		{
211	2	return $this->getRecords();
212		}
213
214		/**
215		* {@inheritdoc}
216		*/
217	2	public function jsonSerialize(): array
218		{
219	2	return iterator_to_array($this->getRecords(), false);
220		}
221
222		/**
223		* Returns the CSV records as an iterator object.
224		*
225		* Each CSV record is represented as a simple array containig strings or null values.
226		*
227		* If the CSV document has a header record then each record is combined
228		* to the header record and the header record is removed from the iterator.
229		*
230		* If the CSV document is inconsistent. Missing record fields are
231		* filled with null values while extra record fields are strip from
232		* the returned object.
233		*
234		* @param string[] $header an optional header to use instead of the CSV document header
235		*
236		* @return Iterator
237		*/
238	12	public function getRecords(array $header = []): Iterator
239		{
240	12	$header = $this->computeHeader($header);
241	10	$normalized = function ($record): bool {
242	10	return is_array($record) && $record != [null];
243	10	};
244	10	$bom = $this->getInputBOM();
245	10	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
246	10	$this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
247
248	10	$records = $this->stripBOM(new CallbackFilterIterator($this->document, $normalized), $bom);
249	10	if (null !== $this->header_offset) {
250	4	$records = new CallbackFilterIterator($records, function (array $record, int $offset): bool {
251	4	return $offset !== $this->header_offset;
252	4	});
253		}
254
255	10	return $this->combineHeader($records, $header);
256		}
257
258		/**
259		* Returns the header to be used for iteration
260		*
261		* @param string[] $header
262		*
263		* @throws Exception If the header contains non unique column name
264		*
265		* @return string[]
266		*/
267	16	protected function computeHeader(array $header)
268		{
269	16	if (empty($header)) {
270	14	$header = $this->getHeader();
271		}
272
273	16	if ($header === array_unique(array_filter($header, 'is_string'))) {
274	14	return $header;
275		}
276
277	2	throw new Exception('The header record must be empty or a flat array with unique string values');
278		}
279
280		/**
281		* Combine the CSV header to each record if present
282		*
283		* @param Iterator $iterator
284		* @param string[] $header
285		*
286		* @return Iterator
287		*/
288	20	protected function combineHeader(Iterator $iterator, array $header): Iterator
289		{
290	20	if (empty($header)) {
291	14	return $iterator;
292		}
293
294	8	$field_count = count($header);
295	8	$mapper = function (array $record) use ($header, $field_count): array {
296	8	if (count($record) != $field_count) {
297	4	$record = array_slice(array_pad($record, $field_count, null), 0, $field_count);
298		}
299
300	8	return array_combine($header, $record);
301	8	};
302
303	8	return new MapIterator($iterator, $mapper);
304		}
305
306		/**
307		* Strip the BOM sequence from the returned records if necessary
308		*
309		* @param Iterator $iterator
310		* @param string $bom
311		*
312		* @return Iterator
313		*/
314	16	protected function stripBOM(Iterator $iterator, string $bom): Iterator
315		{
316	16	if ('' === $bom) {
317	10	return $iterator;
318		}
319
320	6	$bom_length = mb_strlen($bom);
321	6	$mapper = function (array $record, int $index) use ($bom_length): array {
322	6	if (0 != $index) {
323	2	return $record;
324		}
325
326	6	return $this->removeBOM($record, $bom_length, $this->enclosure);
327	6	};
328
329	6	return new MapIterator($iterator, $mapper);
330		}
331
332		/**
333		* Selects the record to be used as the CSV header
334		*
335		* Because the header is represented as an array, to be valid
336		* a header MUST contain only unique string value.
337		*
338		* @param int\|null $offset the header record offset
339		*
340		* @throws Exception if the offset is a negative integer
341		*
342		* @return static
343		*/
344	14	public function setHeaderOffset($offset): self
345		{
346	14	if ($offset === $this->header_offset) {
347	8	return $this;
348		}
349
350	6	if (!is_nullable_int($offset)) {
351	2	throw new TypeError(sprintf(__METHOD__.'() expects 1 Argument to be null or an integer %s given', gettype($offset)));
352		}
353
354	4	if (null !== $offset && 0 > $offset) {
355	2	throw new Exception(__METHOD__.'() expects 1 Argument to be greater or equal to 0');
356		}
357
358	2	$this->header_offset = $offset;
359	2	$this->resetProperties();
360
361	2	return $this;
362		}
363
364		/**
365		* {@inheritdoc}
366		*/
367	8	protected function resetProperties()
368		{
369	8	$this->nb_records = -1;
370	8	$this->header = [];
371	8	}
372		}
373

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