Reader::__call() - Code Metrics - Inspection of "Merge pull request #353 from thephpleague/feature/..." - thephpleague/csv - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Push — master ( 6a3d0e...4c67e5 )

by ignace nyamagana

created 2019-08-29 08:08 UTC

Reader::__call() A

↳ Parent: Reader

Complexity

Conditions	2
Paths	2

Size

Total Lines

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	5
CRAP Score	2

Importance

Changes

Metric	Value
cc	2
nc	2
nop	2
dl	0
loc	9
ccs	5
cts	5
cp	1
crap	2
rs	9.9666
c	0
b	0
f	0

<?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 BadMethodCallException;
use CallbackFilterIterator;
use Countable;
use Generator;
use Iterator;
use IteratorAggregate;
use JsonSerializable;
use League\Csv\Polyfill\EmptyEscapeParser;
use SplFileObject;
use TypeError;
use function array_combine;
use function array_filter;
use function array_pad;
use function array_slice;
use function array_unique;
use function gettype;
use function is_array;
use function iterator_count;
use function iterator_to_array;
use function mb_strlen;
use function mb_substr;
use function sprintf;
use function strlen;
use function substr;
use const PHP_VERSION_ID;
use const STREAM_FILTER_READ;

/**
 * A class to parse and read records from a CSV document.
 *
 * @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', $context = null)
    {
        return parent::createFromPath($path, $open_mode, $context);
    }

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

    /**
     * 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 ([] !== $this->header) {
            return $this->header;
        }

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

        return $this->header;
    }

    /**
     * Determine the CSV record header.
     *
     * @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 (false === $header || [] === $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.
     *
     * @return array|false
     */
    protected function seekRow(int $offset)
    {
        foreach ($this->getDocument() as $index => $record) {
            if ($offset === $index) {
                return $record;
            }
        }

        return false;
    }

    /**
     * Returns the document as an Iterator.
     */
    protected function getDocument(): Iterator
    {
        if (70400 > PHP_VERSION_ID && '' === $this->escape) {
            $this->document->setCsvControl($this->delimiter, $this->enclosure);

            return EmptyEscapeParser::parse($this->document);
        }

        $this->document->setFlags(SplFileObject::READ_CSV | SplFileObject::READ_AHEAD | SplFileObject::SKIP_EMPTY);
        $this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
        $this->document->rewind();

        return $this->document;
    }

    /**
     * Strip the BOM sequence from a record.
     *
     * @param string[] $record
     *
     * @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', static::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 containing 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
     */
    public function getRecords(array $header = []): Iterator
    {
        $header = $this->computeHeader($header);
        $normalized = static function ($record): bool {
            return is_array($record) && $record != [null];
        };

        $bom = '';
        if ($this->is_input_bom_skipped) {
            $bom = $this->getInputBOM();
        }

        $document = $this->getDocument();
        $records = $this->stripBOM(new CallbackFilterIterator($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 ([] === $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 string[] $header
     */
    protected function combineHeader(Iterator $iterator, array $header): Iterator
    {
        if ([] === $header) {
            return $iterator;
        }

        $field_count = count($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);
            }

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

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

    /**
     * Strip the BOM sequence from the returned records if necessary.
     */
    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;
    }
}


1		<?php
2
3		/**
4		* League.Csv (https://csv.thephpleague.com)
5		*
6		* (c) Ignace Nyamagana Butera <[email protected]>
7		*
8		* For the full copyright and license information, please view the LICENSE
9		* file that was distributed with this source code.
10		*/
11
12		declare(strict_types=1);
13
14		namespace League\Csv;
15
16		use BadMethodCallException;
17		use CallbackFilterIterator;
18		use Countable;
19		use Generator;
20		use Iterator;
21		use IteratorAggregate;
22		use JsonSerializable;
23		use League\Csv\Polyfill\EmptyEscapeParser;
24		use SplFileObject;
25		use TypeError;
26		use function array_combine;
27		use function array_filter;
28		use function array_pad;
29		use function array_slice;
30		use function array_unique;
31		use function gettype;
32		use function is_array;
33		use function iterator_count;
34		use function iterator_to_array;
35		use function mb_strlen;
36		use function mb_substr;
37		use function sprintf;
38		use function strlen;
39		use function substr;
40		use const PHP_VERSION_ID;
41		use const STREAM_FILTER_READ;
42
43		/**
44		* A class to parse and read records from a CSV document.
45		*
46		* @method array fetchOne(int $nth_record = 0) Returns a single record from the CSV
47		* @method Generator fetchColumn(string\|int $column_index) Returns the next value from a single CSV record field
48		* @method Generator fetchPairs(string\|int $offset_index = 0, string\|int $value_index = 1) Fetches the next key-value pairs from the CSV document
49		*/
50		class Reader extends AbstractCsv implements Countable, IteratorAggregate, JsonSerializable
51		{
52		/**
53		* header offset.
54		*
55		* @var int\|null
56		*/
57		protected $header_offset;
58
59		/**
60		* header record.
61		*
62		* @var string[]
63		*/
64		protected $header = [];
65
66		/**
67		* records count.
68		*
69		* @var int
70		*/
71		protected $nb_records = -1;
72
73		/**
74		* {@inheritdoc}
75		*/
76		protected $stream_filter_mode = STREAM_FILTER_READ;
77
78		/**
79		* {@inheritdoc}
80		*/
81	3	public static function createFromPath(string $path, string $open_mode = 'r', $context = null)
82		{
83	3	return parent::createFromPath($path, $open_mode, $context);
84		}
85
86		/**
87		* {@inheritdoc}
88		*/
89	27	protected function resetProperties()
90		{
91	27	parent::resetProperties();
92	27	$this->nb_records = -1;
93	27	$this->header = [];
94	27	}
95
96		/**
97		* Returns the header offset.
98		*
99		* If no CSV header offset is set this method MUST return null
100		*
101		* @return int\|null
102		*/
103	15	public function getHeaderOffset()
104		{
105	15	return $this->header_offset;
106		}
107
108		/**
109		* Returns the CSV record used as header.
110		*
111		* The returned header is represented as an array of string values
112		*
113		* @return string[]
114		*/
115	21	public function getHeader(): array
116		{
117	21	if (null === $this->header_offset) {
118	15	return $this->header;
119		}
120
121	9	if ([] !== $this->header) {
122	3	return $this->header;
123		}
124
125	9	$this->header = $this->setHeader($this->header_offset);
126
127	6	return $this->header;
128		}
129
130		/**
131		* Determine the CSV record header.
132		*
133		* @throws Exception If the header offset is set and no record is found or is the empty array
134		*
135		* @return string[]
136		*/
137	12	protected function setHeader(int $offset): array
138		{
139	12	$header = $this->seekRow($offset);
140	12	if (false === $header \|\| [] === $header) {
141	6	throw new Exception(sprintf('The header record does not exist or is empty at offset: `%s`', $offset));
142		}
143
144	6	if (0 === $offset) {
145	3	return $this->removeBOM($header, mb_strlen($this->getInputBOM()), $this->enclosure);
146		}
147
148	3	return $header;
149		}
150
151		/**
152		* Returns the row at a given offset.
153		*
154		* @return array\|false
155		*/
156	12	protected function seekRow(int $offset)
157		{
158	12	foreach ($this->getDocument() as $index => $record) {
159	12	if ($offset === $index) {
160	9	return $record;
161		}
162		}
163
164	9	return false;
165		}
166
167		/**
168		* Returns the document as an Iterator.
169		*/
170	18	protected function getDocument(): Iterator
171		{
172	18	if (70400 > PHP_VERSION_ID && '' === $this->escape) {
173	6	$this->document->setCsvControl($this->delimiter, $this->enclosure);
174
175	6	return EmptyEscapeParser::parse($this->document);
176		}
177
178	12	$this->document->setFlags(SplFileObject::READ_CSV \| SplFileObject::READ_AHEAD \| SplFileObject::SKIP_EMPTY);
179	12	$this->document->setCsvControl($this->delimiter, $this->enclosure, $this->escape);
180	12	$this->document->rewind();
181
182	12	return $this->document;
183		}
184
185		/**
186		* Strip the BOM sequence from a record.
187		*
188		* @param string[] $record
189		*
190		* @return string[]
191		*/
192	12	protected function removeBOM(array $record, int $bom_length, string $enclosure): array
193		{
194	12	if (0 === $bom_length) {
195	3	return $record;
196		}
197
198	9	$record[0] = mb_substr($record[0], $bom_length);
199	9	if ($enclosure.$enclosure != substr($record[0].$record[0], strlen($record[0]) - 1, 2)) {
200	6	return $record;
201		}
202
203	3	$record[0] = substr($record[0], 1, -1);
204
205	3	return $record;
206		}
207
208		/**
209		* {@inheritdoc}
210		*/
211	9	public function __call($method, array $arguments)
212		{
213	9	static $whitelisted = ['fetchColumn' => 1, 'fetchOne' => 1, 'fetchPairs' => 1];
214	9	if (isset($whitelisted[$method])) {
215	3	return (new ResultSet($this->getRecords(), $this->getHeader()))->$method(...$arguments);
216		}
217
218	6	throw new BadMethodCallException(sprintf('%s::%s() method does not exist', static::class, $method));
219		}
220
221		/**
222		* {@inheritdoc}
223		*/
224	3	public function count(): int
225		{
226	3	if (-1 === $this->nb_records) {
227	3	$this->nb_records = iterator_count($this->getRecords());
228		}
229
230	3	return $this->nb_records;
231		}
232
233		/**
234		* {@inheritdoc}
235		*/
236	6	public function getIterator(): Iterator
237		{
238	6	return $this->getRecords();
239		}
240
241		/**
242		* {@inheritdoc}
243		*/
244	3	public function jsonSerialize(): array
245		{
246	3	return iterator_to_array($this->getRecords(), false);
247		}
248
249		/**
250		* Returns the CSV records as an iterator object.
251		*
252		* Each CSV record is represented as a simple array containing strings or null values.
253		*
254		* If the CSV document has a header record then each record is combined
255		* to the header record and the header record is removed from the iterator.
256		*
257		* If the CSV document is inconsistent. Missing record fields are
258		* filled with null values while extra record fields are strip from
259		* the returned object.
260		*
261		* @param string[] $header an optional header to use instead of the CSV document header
262		*/
263	21	public function getRecords(array $header = []): Iterator
264		{
265	21	$header = $this->computeHeader($header);
266	18	$normalized = static function ($record): bool {
267	18	return is_array($record) && $record != [null];
268	18	};
269
270	18	$bom = '';
271	18	if ($this->is_input_bom_skipped) {
272	15	$bom = $this->getInputBOM();
273		}
274
275	18	$document = $this->getDocument();
276	18	$records = $this->stripBOM(new CallbackFilterIterator($document, $normalized), $bom);
277	18	if (null !== $this->header_offset) {
278	6	$records = new CallbackFilterIterator($records, function (array $record, int $offset): bool {
279	6	return $offset !== $this->header_offset;
280	6	});
281		}
282
283	18	return $this->combineHeader($records, $header);
284		}
285
286		/**
287		* Returns the header to be used for iteration.
288		*
289		* @param string[] $header
290		*
291		* @throws Exception If the header contains non unique column name
292		*
293		* @return string[]
294		*/
295	27	protected function computeHeader(array $header)
296		{
297	27	if ([] === $header) {
298	24	$header = $this->getHeader();
299		}
300
301	27	if ($header === array_unique(array_filter($header, 'is_string'))) {
302	24	return $header;
303		}
304
305	3	throw new Exception('The header record must be empty or a flat array with unique string values');
306		}
307
308		/**
309		* Combine the CSV header to each record if present.
310		*
311		* @param string[] $header
312		*/
313	33	protected function combineHeader(Iterator $iterator, array $header): Iterator
314		{
315	33	if ([] === $header) {
316	24	return $iterator;
317		}
318
319	12	$field_count = count($header);
320	12	$mapper = static function (array $record) use ($header, $field_count): array {
321	12	if (count($record) != $field_count) {
322	6	$record = array_slice(array_pad($record, $field_count, null), 0, $field_count);
323		}
324
325	12	return array_combine($header, $record);
326	12	};
327
328	12	return new MapIterator($iterator, $mapper);
329		}
330
331		/**
332		* Strip the BOM sequence from the returned records if necessary.
333		*/
334	27	protected function stripBOM(Iterator $iterator, string $bom): Iterator
335		{
336	27	if ('' === $bom) {
337	18	return $iterator;
338		}
339
340	9	$bom_length = mb_strlen($bom);
341	9	$mapper = function (array $record, int $index) use ($bom_length): array {
342	9	if (0 !== $index) {
343	3	return $record;
344		}
345
346	9	return $this->removeBOM($record, $bom_length, $this->enclosure);
347	9	};
348
349	9	return new MapIterator($iterator, $mapper);
350		}
351
352		/**
353		* Selects the record to be used as the CSV header.
354		*
355		* Because the header is represented as an array, to be valid
356		* a header MUST contain only unique string value.
357		*
358		* @param int\|null $offset the header record offset
359		*
360		* @throws Exception if the offset is a negative integer
361		*
362		* @return static
363		*/
364	24	public function setHeaderOffset($offset): self
365		{
366	24	if ($offset === $this->header_offset) {
367	12	return $this;
368		}
369
370	12	if (!is_nullable_int($offset)) {
371	3	throw new TypeError(sprintf(__METHOD__.'() expects 1 Argument to be null or an integer %s given', gettype($offset)));
372		}
373
374	9	if (null !== $offset && 0 > $offset) {
375	3	throw new Exception(__METHOD__.'() expects 1 Argument to be greater or equal to 0');
376		}
377
378	6	$this->header_offset = $offset;
379	6	$this->resetProperties();
380
381	6	return $this;
382		}
383		}
384

thephpleague / csv

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Reader::__call() A

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