Reader::__call() - Code Metrics - Inspection of "adding Reader::__call to reduce BC break" - thephpleague/csv - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#230)

by ignace nyamagana

created 2017-05-28 11:11 UTC

Reader::__call() A

↳ Parent: Reader

Complexity

Conditions	1
Paths	1

Size

Total Lines	4
Code Lines	2

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	2
CRAP Score	1

Importance

Changes

Metric	Value
cc	1
eloc	2
nc	1
nop	2
dl	0
loc	4
ccs	2
cts	2
cp	1
crap	1
rs	10
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 9.0.0
* @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 CallbackFilterIterator;
use Iterator;
use IteratorAggregate;
use League\Csv\Exception\RuntimeException;
use LimitIterator;
use SplFileObject;

/**
 * A class to manage records selection from a CSV document
 *
 * @package League.csv
 * @since  3.0.0
 *
 * @method int count()
 * @method array fetchAll()
 * @method array fetchOne(int $offset = 0)
 * @method Generator fetchPairs(string|int $offset_index, string|int $value_index)
 * @method Generator fetchColumn(string|int $column_index)
 * @method ResultSet preserveRecordOffset(bool $status)
 * @method bool isRecordOffsetPreserved()
 * @method array getColumnNames()
 */
class Reader extends AbstractCsv implements IteratorAggregate
{
    /**
     * @inheritdoc
     */
    protected $stream_filter_mode = STREAM_FILTER_READ;

    /**
     * CSV Document header offset
     *
     * @var int|null
     */
    protected $header_offset;

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

    /**
     * Tell whether the header needs to be re-generated
     *
     * @var bool
     */
    protected $is_header_loaded = false;

    /**
     * The value to pad if the record is less than header size.
     *
     * @var mixed
     */
    protected $record_padding_value;

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

    /**
     * Returns wether the selected header can be combine to each record
     *
     * A valid header must be empty or contains unique string field names
     *
     * @return bool
     */
    public function supportsHeaderAsRecordKeys(): bool
    {
        $header = $this->getHeader();

        return empty($header) || $header === array_unique(array_filter($header, 'is_string'));
    }

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

        $this->is_header_loaded = true;
        $this->header = [];
        if (null !== $this->header_offset) {
            $this->header = $this->setHeader($this->header_offset);
        }

        return $this->header;
    }

    /**
     * Determine the CSV record header
     *
     * @param int $offset
     *
     * @throws RuntimeException If the header offset is an integer
     *                          and the corresponding record is missing
     *                          or is an empty array
     *
     * @return string[]
     */
    protected function setHeader(int $offset): array
    {
        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
        $this->document->seek($offset);
        $header = $this->document->current();
        if (empty($header)) {
            throw new RuntimeException(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;
    }

    /**
     * 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 == mb_substr($record[0], 0, 1) && $enclosure == mb_substr($record[0], -1, 1)) {
            $record[0] = mb_substr($record[0], 1, -1);
        }

        return $record;
    }

    /**
     * Returns the record padding value
     *
     * @return mixed
     */
    public function getRecordPaddingValue()
    {
        return $this->record_padding_value;
    }

    /**
     * Returns a CSV records collection
     *
     * @param Statement $stmt
     *
     * @return ResultSet
     */
    public function select(Statement $stmt): ResultSet
    {
        return $stmt->process($this);
    }

    /**
     * @inheritdoc
     */
    public function __call($method, array $arguments)
    {
        return (new Statement())->process($this)->$method(...$arguments);
    }

    /**
     * Detect Delimiters occurences in the CSV
     *
     * Returns a associative array where each key represents
     * a valid delimiter and each value the number of occurences
     *
     * @param string[] $delimiters the delimiters to consider
     * @param int      $nb_records Detection is made using $nb_records of the CSV
     *
     * @return array
     */
    public function fetchDelimitersOccurrence(array $delimiters, int $nb_records = 1): array
    {
        $filter = function ($value): bool {
            return 1 == strlen($value);
        };

        $nb_records = $this->filterMinRange($nb_records, 1, 'The number of records to consider must be a valid positive integer');
        $delimiters = array_unique(array_filter($delimiters, $filter));
        $reducer = function (array $res, string $delimiter) use ($nb_records): array {
            $res[$delimiter] = $this->getCellCount($delimiter, $nb_records);

            return $res;
        };

        $res = array_reduce($delimiters, $reducer, []);
        arsort($res, SORT_NUMERIC);

        return $res;
    }

    /**
     * Returns the cell count for a specified delimiter
     * and a specified number of records
     *
     * @param string $delimiter  CSV delimiter
     * @param int    $nb_records CSV records to consider
     *
     * @return int
     */
    protected function getCellCount(string $delimiter, int $nb_records): int
    {
        $filter = function ($record): bool {
            return is_array($record) && count($record) > 1;
        };

        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($delimiter, $this->enclosure, $this->escape);
        $iterator = new CallbackFilterIterator(new LimitIterator($this->document, 0, $nb_records), $filter);

        return count(iterator_to_array($iterator, false), COUNT_RECURSIVE);
    }

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

    /**
     * Returns the CSV records in an iterator object.
     *
     * Each CSV record is represented as a simple array of string or null values.
     *
     * If the CSV document has a header record then each record is combined
     * to each 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.
     *
     * @throws RuntimeException If the header contains non unique column name
     *
     * @return Iterator
     */
    public function getRecords(): Iterator
    {
        if (!$this->supportsHeaderAsRecordKeys()) {
            throw new RuntimeException('The header record must be empty or a flat array with unique string values');
        }

        $normalized = function ($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);

        return $this->combineHeader($this->stripBOM(new CallbackFilterIterator($this->document, $normalized), $bom));
    }

    /**
     * Add the CSV header if present and valid
     *
     * @param Iterator $iterator
     *
     * @return Iterator
     */
    protected function combineHeader(Iterator $iterator): Iterator
    {
        if (null === $this->header_offset) {
            return $iterator;
        }

        $iterator = new CallbackFilterIterator($iterator, function (array $record, int $offset): bool {
            return $offset != $this->header_offset;
        });

        $header = $this->getHeader();
        $field_count = count($header);
        $mapper = function (array $record) use ($header, $field_count): array {
            if (count($record) != $field_count) {
                $record = array_slice(array_pad($record, $field_count, $this->record_padding_value), 0, $field_count);
            }

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

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

    /**
     * Strip the BOM sequence if present
     *
     * @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 of the header is represented as an array, to be valid
     * a header MUST contain only unique string value.
     *
     * @param int|null $offset the header record offset
     *
     * @return static
     */
    public function setHeaderOffset($offset): self
    {
        if (null !== $offset) {
            $offset = $this->filterMinRange($offset, 0, 'The header offset index must be a positive integer or 0');
        }

        if ($offset !== $this->header_offset) {
            $this->header_offset = $offset;
            $this->resetProperties();
        }

        return $this;
    }

    /**
     * Set the record padding value
     *
     * @param mixed $record_padding_value
     *
     * @return static
     */
    public function setRecordPaddingValue($record_padding_value): self
    {
        $this->record_padding_value = $record_padding_value;

        return $this;
    }

    /**
     * @inheritdoc
     */
    protected function resetProperties()
    {
        return $this->is_header_loaded = false;
    }
}


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 9.0.0
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 CallbackFilterIterator;
18		use Iterator;
19		use IteratorAggregate;
20		use League\Csv\Exception\RuntimeException;
21		use LimitIterator;
22		use SplFileObject;
23
24		/**
25		* A class to manage records selection from a CSV document
26		*
27		* @package League.csv
28		* @since 3.0.0
29		*
30		* @method int count()
31		* @method array fetchAll()
32		* @method array fetchOne(int $offset = 0)
33		* @method Generator fetchPairs(string\|int $offset_index, string\|int $value_index)
34		* @method Generator fetchColumn(string\|int $column_index)
35		* @method ResultSet preserveRecordOffset(bool $status)
36		* @method bool isRecordOffsetPreserved()
37		* @method array getColumnNames()
38		*/
39		class Reader extends AbstractCsv implements IteratorAggregate
40		{
41		/**
42		* @inheritdoc
43		*/
44		protected $stream_filter_mode = STREAM_FILTER_READ;
45
46		/**
47		* CSV Document header offset
48		*
49		* @var int\|null
50		*/
51		protected $header_offset;
52
53		/**
54		* CSV Document Header record
55		*
56		* @var string[]
57		*/
58		protected $header = [];
59
60		/**
61		* Tell whether the header needs to be re-generated
62		*
63		* @var bool
64		*/
65		protected $is_header_loaded = false;
66
67		/**
68		* The value to pad if the record is less than header size.
69		*
70		* @var mixed
71		*/
72		protected $record_padding_value;
73
74		/**
75		* Returns the record offset used as header
76		*
77		* If no CSV record is used this method MUST return null
78		*
79		* @return int\|null
80		*/
81	2	public function getHeaderOffset()
82		{
83	2	return $this->header_offset;
84		}
85
86		/**
87		* Returns wether the selected header can be combine to each record
88		*
89		* A valid header must be empty or contains unique string field names
90		*
91		* @return bool
92		*/
93	2	public function supportsHeaderAsRecordKeys(): bool
94		{
95	2	$header = $this->getHeader();
96
97	2	return empty($header) \|\| $header === array_unique(array_filter($header, 'is_string'));
98		}
99
100		/**
101		* Returns the CSV record header
102		*
103		* The returned header is represented as an array of string values
104		*
105		* @return string[]
106		*/
107	4	public function getHeader(): array
108		{
109	4	if ($this->is_header_loaded) {
110	2	return $this->header;
111		}
112
113	4	$this->is_header_loaded = true;
114	4	$this->header = [];
115	4	if (null !== $this->header_offset) {
116	4	$this->header = $this->setHeader($this->header_offset);
117		}
118
119	4	return $this->header;
120		}
121
122		/**
123		* Determine the CSV record header
124		*
125		* @param int $offset
126		*
127		* @throws RuntimeException If the header offset is an integer
128		* and the corresponding record is missing
129		* or is an empty array
130		*
131		* @return string[]
132		*/
133	6	protected function setHeader(int $offset): array
134		{
135	6	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
136	6	$this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
137	6	$this->document->seek($offset);
138	6	$header = $this->document->current();
139	6	if (empty($header)) {
140	2	throw new RuntimeException(sprintf('The header record does not exist or is empty at offset: `%s`', $offset));
141		}
142
143	4	if (0 === $offset) {
144	2	return $this->removeBOM($header, mb_strlen($this->getInputBOM()), $this->enclosure);
145		}
146
147	2	return $header;
148		}
149
150		/**
151		* Strip the BOM sequence from a record
152		*
153		* @param string[] $record
154		* @param int $bom_length
155		* @param string $enclosure
156		*
157		* @return string[]
158		*/
159	8	protected function removeBOM(array $record, int $bom_length, string $enclosure): array
160		{
161	8	if (0 == $bom_length) {
162	2	return $record;
163		}
164
165	6	$record[0] = mb_substr($record[0], $bom_length);
166	6	if ($enclosure == mb_substr($record[0], 0, 1) && $enclosure == mb_substr($record[0], -1, 1)) {
167	2	$record[0] = mb_substr($record[0], 1, -1);
168		}
169
170	6	return $record;
171		}
172
173		/**
174		* Returns the record padding value
175		*
176		* @return mixed
177		*/
178	2	public function getRecordPaddingValue()
179		{
180	2	return $this->record_padding_value;
181		}
182
183		/**
184		* Returns a CSV records collection
185		*
186		* @param Statement $stmt
187		*
188		* @return ResultSet
189		*/
190	2	public function select(Statement $stmt): ResultSet
191		{
192	2	return $stmt->process($this);
193		}
194
195		/**
196		* @inheritdoc
197		*/
198	2	public function __call($method, array $arguments)
199		{
200	2	return (new Statement())->process($this)->$method(...$arguments);
201		}
202
203		/**
204		* Detect Delimiters occurences in the CSV
205		*
206		* Returns a associative array where each key represents
207		* a valid delimiter and each value the number of occurences
208		*
209		* @param string[] $delimiters the delimiters to consider
210		* @param int $nb_records Detection is made using $nb_records of the CSV
211		*
212		* @return array
213		*/
214	6	public function fetchDelimitersOccurrence(array $delimiters, int $nb_records = 1): array
215		{
216		$filter = function ($value): bool {
217	4	return 1 == strlen($value);
218	3	};
219
220	6	$nb_records = $this->filterMinRange($nb_records, 1, 'The number of records to consider must be a valid positive integer');
221	4	$delimiters = array_unique(array_filter($delimiters, $filter));
222		$reducer = function (array $res, string $delimiter) use ($nb_records): array {
223	4	$res[$delimiter] = $this->getCellCount($delimiter, $nb_records);
224
225	4	return $res;
226	4	};
227
228	4	$res = array_reduce($delimiters, $reducer, []);
229	4	arsort($res, SORT_NUMERIC);
230
231	4	return $res;
232		}
233
234		/**
235		* Returns the cell count for a specified delimiter
236		* and a specified number of records
237		*
238		* @param string $delimiter CSV delimiter
239		* @param int $nb_records CSV records to consider
240		*
241		* @return int
242		*/
243	2	protected function getCellCount(string $delimiter, int $nb_records): int
244		{
245		$filter = function ($record): bool {
246	2	return is_array($record) && count($record) > 1;
247	1	};
248
249	2	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
250	2	$this->document->setCsvControl($delimiter, $this->enclosure, $this->escape);
251	2	$iterator = new CallbackFilterIterator(new LimitIterator($this->document, 0, $nb_records), $filter);
252
253	2	return count(iterator_to_array($iterator, false), COUNT_RECURSIVE);
254		}
255
256		/**
257		* @inheritdoc
258		*/
259	18	public function getIterator(): Iterator
260		{
261	18	return $this->getRecords();
262		}
263
264		/**
265		* Returns the CSV records in an iterator object.
266		*
267		* Each CSV record is represented as a simple array of string or null values.
268		*
269		* If the CSV document has a header record then each record is combined
270		* to each header record and the header record is removed from the iterator.
271		*
272		* If the CSV document is inconsistent. Missing record fields are
273		* filled with null values while extra record fields are strip from
274		* the returned object.
275		*
276		* @throws RuntimeException If the header contains non unique column name
277		*
278		* @return Iterator
279		*/
280	4	public function getRecords(): Iterator
281		{
282	4	if (!$this->supportsHeaderAsRecordKeys()) {
283	2	throw new RuntimeException('The header record must be empty or a flat array with unique string values');
284		}
285
286		$normalized = function ($record): bool {
287	2	return is_array($record) && $record != [null];
288	1	};
289	2	$bom = $this->getInputBOM();
290	2	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
291	2	$this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
292
293	2	return $this->combineHeader($this->stripBOM(new CallbackFilterIterator($this->document, $normalized), $bom));
294		}
295
296		/**
297		* Add the CSV header if present and valid
298		*
299		* @param Iterator $iterator
300		*
301		* @return Iterator
302		*/
303	14	protected function combineHeader(Iterator $iterator): Iterator
304		{
305	14	if (null === $this->header_offset) {
306	8	return $iterator;
307		}
308
309		$iterator = new CallbackFilterIterator($iterator, function (array $record, int $offset): bool {
310	8	return $offset != $this->header_offset;
311	8	});
312
313	8	$header = $this->getHeader();
314	8	$field_count = count($header);
315		$mapper = function (array $record) use ($header, $field_count): array {
316	8	if (count($record) != $field_count) {
317	4	$record = array_slice(array_pad($record, $field_count, $this->record_padding_value), 0, $field_count);
318		}
319
320	8	return array_combine($header, $record);
321	8	};
322
323	8	return new MapIterator($iterator, $mapper);
324		}
325
326		/**
327		* Strip the BOM sequence if present
328		*
329		* @param Iterator $iterator
330		* @param string $bom
331		*
332		* @return Iterator
333		*/
334	10	protected function stripBOM(Iterator $iterator, string $bom): Iterator
335		{
336	10	if ('' === $bom) {
337	4	return $iterator;
338		}
339
340	6	$bom_length = mb_strlen($bom);
341	6	$mapper = function (array $record, int $index) use ($bom_length): array {
342	6	if (0 != $index) {
343	2	return $record;
344		}
345
346	6	return $this->removeBOM($record, $bom_length, $this->enclosure);
347	6	};
348
349	6	return new MapIterator($iterator, $mapper);
350		}
351
352
353		/**
354		* Selects the record to be used as the CSV header
355		*
356		* Because of the header is represented as an array, to be valid
357		* a header MUST contain only unique string value.
358		*
359		* @param int\|null $offset the header record offset
360		*
361		* @return static
362		*/
363	2	public function setHeaderOffset($offset): self
364		{
365	2	if (null !== $offset) {
366	2	$offset = $this->filterMinRange($offset, 0, 'The header offset index must be a positive integer or 0');
367		}
368
369	2	if ($offset !== $this->header_offset) {
370	2	$this->header_offset = $offset;
371	2	$this->resetProperties();
372		}
373
374	2	return $this;
375		}
376
377		/**
378		* Set the record padding value
379		*
380		* @param mixed $record_padding_value
381		*
382		* @return static
383		*/
384	2	public function setRecordPaddingValue($record_padding_value): self
385		{
386	2	$this->record_padding_value = $record_padding_value;
387
388	2	return $this;
389		}
390
391		/**
392		* @inheritdoc
393		*/
394	2	protected function resetProperties()
395		{
396	2	return $this->is_header_loaded = false;
397		}
398		}
399

thephpleague / csv

Pull Request — master (#230)

Reader::__call() A

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