Statement::computeHeader() - Code Metrics - Inspection of "Implementing 9.0 Public API" - thephpleague/csv - Measure and Improve Code Quality continuously with Scrutinizer

Completed

Pull Request — master (#210)

by ignace nyamagana

created 2017-02-03 14:37 UTC

Statement::computeHeader() B

↳ Parent: Statement

Complexity

Conditions	4
Paths	4

Size

Total Lines	24
Code Lines	15

Duplication

Lines	0
Ratio	0 %

Code Coverage

Tests	15
CRAP Score	4

Importance

Changes

Metric	Value
dl	0
loc	24
ccs	15
cts	15
cp	1
rs	8.6845
c	0
b	0
f	0
cc	4
eloc	15
nc	4
nop	1
crap	4

<?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 ArrayIterator;
use CallbackFilterIterator;
use Iterator;
use League\Csv\Config\ValidatorTrait;
use LimitIterator;

/**
 *  A trait to manage filtering a CSV
 *
 * @package League.csv
 * @since  9.0.0
 *
 */
class Statement
{
    use ValidatorTrait;

    /**
     * Callables to filter the iterator
     *
     * @var callable[]
     */
    protected $where = [];

    /**
     * Callables to sort the iterator
     *
     * @var callable[]
     */
    protected $order_by = [];

    /**
     * iterator Offset
     *
     * @var int
     */
    protected $offset = 0;

    /**
     * iterator maximum length
     *
     * @var int
     */
    protected $limit = -1;

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

    /**
     * Set LimitIterator Offset
     *
     * @param $offset
     *
     * @return self
     */
    public function offset(int $offset = 0): self
    {
        $offset = $this->filterInteger($offset, 0, 'the offset must be a positive integer or 0');
        if ($offset === $this->offset) {
            return $this;
        }

        $clone = clone $this;
        $clone->offset = $offset;

        return $clone;
    }

    /**
     * Set LimitIterator Count
     *
     * @param int $limit
     *
     * @return self
     */
    public function limit(int $limit = -1): self
    {
        $limit = $this->filterInteger($limit, -1, 'the limit must an integer greater or equals to -1');
        if ($limit === $this->limit) {
            return $this;
        }

        $clone = clone $this;
        $clone->limit = $limit;

        return $clone;
    }

    /**
     * Set an Iterator sorting callable function
     *
     * @param callable $callable
     *
     * @return self
     */
    public function orderBy(callable $callable): self
    {
        $clone = clone $this;
        $clone->order_by[] = $callable;

        return $clone;
    }

    /**
     * Set the Iterator filter method
     *
     * @param callable $callable
     *
     * @return self
     */
    public function where(callable $callable): self
    {
        $clone = clone $this;
        $clone->where[] = $callable;

        return $clone;
    }

    /**
     * Set the headers to be used by the RecordSet object
     *
     * @param string[] $header
     *
     * @return self
     */
    public function header(array $header): self
    {
        $header = $this->filterHeader($header);
        if ($header === $this->header) {
            return $this;
        }

        $clone = clone $this;
        $clone->header = $header;

        return $clone;
    }

    /**
     * Returns the inner CSV Document Iterator object
     *
     * @return RecordSet
     */
    public function process(Reader $reader)
    {
        $header = $this->header;
        if (empty($header)) {
            $header = $this->computeHeader($reader);
        }

        $normalized = function ($row) {
            return is_array($row) && $row != [null];
        };

        $iterator = $this->stripBOM(
            new CallbackFilterIterator($reader->getIterator(), $normalized),
            $reader->getInputBOM(),
            $reader->getEnclosure()
        );
        $iterator = $this->combineHeader($iterator, $header);
        $iterator = $this->filterRecords($iterator);
        $iterator = $this->orderRecords($iterator);

        return new RecordSet(new LimitIterator($iterator, $this->offset, $this->limit), $header);
    }

    /**
     * Set the computed RecordSet headers
     *
     * @param Reader $reader The CSV document Reader object
     *
     * @throws Exception If the header is not found
     *
     * @return string[]
     */
    protected function computeHeader(Reader $reader)
    {
        $offset = $reader->getHeaderOffset();
        if (null === $offset) {
            return [];
        }

        $csv = $reader->getIterator();
        $csv->seek($offset);
        $header = $csv->current();
        if (empty($header)) {
            throw new Exception('The header record specified by `Reader::setHeaderOffset` does not exist or is empty');
        }

        if (0 === $offset) {
            $header = $this->removeBOM($header, mb_strlen($reader->getInputBOM()), $reader->getEnclosure());
        }
        $header = $this->filterHeader($header);
        array_unshift($this->where, function ($row, $index) use ($offset) {
            return $index !== $offset;
        });

        return $header;
    }

    /**
     * Remove the BOM sequence from the CSV
     *
     * @param Iterator $iterator
     *
     * @return Iterator
     */
    protected function stripBOM(Iterator $iterator, string $bom, string $enclosure): Iterator
    {
        if ('' == $bom) {
            return $iterator;
        }

        $bom_length = mb_strlen($bom);
        $strip_bom = function ($row, $index) use ($bom_length, $enclosure) {
            if (0 != $index || !is_array($row)) {
                return $row;
            }

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

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

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

        $header_count = count($header);
        $combine = function (array $row) use ($header_count, $header) {
            if ($header_count != count($row)) {
                $row = array_slice(array_pad($row, $header_count, null), 0, $header_count);
            }

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

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

    /**
    * Filter the Iterator
    *
    * @param Iterator $iterator
    *
    * @return Iterator
    */
    protected function filterRecords(Iterator $iterator): Iterator
    {
        $reducer = function ($iterator, $callable) {
            return new CallbackFilterIterator($iterator, $callable);
        };

        return array_reduce($this->where, $reducer, $iterator);
    }

    /**
    * Sort the Iterator
    *
    * @param Iterator $iterator
    *
    * @return Iterator
    */
    protected function orderRecords(Iterator $iterator): Iterator
    {
        if (empty($this->order_by)) {
            return $iterator;
        }

        $obj = new ArrayIterator(iterator_to_array($iterator));
        $obj->uasort(function ($row_a, $row_b) {
            $res = 0;
            foreach ($this->order_by as $compare) {
                if (0 !== ($res = $compare($row_a, $row_b))) {
                    break;
                }
            }

            return $res;
        });

        return $obj;
    }
}


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 ArrayIterator;
18		use CallbackFilterIterator;
19		use Iterator;
20		use League\Csv\Config\ValidatorTrait;
21		use LimitIterator;
22
23		/**
24		* A trait to manage filtering a CSV
25		*
26		* @package League.csv
27		* @since 9.0.0
28		*
29		*/
30		class Statement
31		{
32		use ValidatorTrait;
33
34		/**
35		* Callables to filter the iterator
36		*
37		* @var callable[]
38		*/
39		protected $where = [];
40
41		/**
42		* Callables to sort the iterator
43		*
44		* @var callable[]
45		*/
46		protected $order_by = [];
47
48		/**
49		* iterator Offset
50		*
51		* @var int
52		*/
53		protected $offset = 0;
54
55		/**
56		* iterator maximum length
57		*
58		* @var int
59		*/
60		protected $limit = -1;
61
62		/**
63		* CSV headers
64		*
65		* @var string[]
66		*/
67		protected $header = [];
68
69		/**
70		* Set LimitIterator Offset
71		*
72		* @param $offset
73		*
74		* @return self
75		*/
76	12	public function offset(int $offset = 0): self
77		{
78	12	$offset = $this->filterInteger($offset, 0, 'the offset must be a positive integer or 0');
79	12	if ($offset === $this->offset) {
80	2	return $this;
81		}
82
83	10	$clone = clone $this;
84	10	$clone->offset = $offset;
85
86	10	return $clone;
87		}
88
89		/**
90		* Set LimitIterator Count
91		*
92		* @param int $limit
93		*
94		* @return self
95		*/
96	16	public function limit(int $limit = -1): self
97		{
98	16	$limit = $this->filterInteger($limit, -1, 'the limit must an integer greater or equals to -1');
99	14	if ($limit === $this->limit) {
100	2	return $this;
101		}
102
103	12	$clone = clone $this;
104	12	$clone->limit = $limit;
105
106	12	return $clone;
107		}
108
109		/**
110		* Set an Iterator sorting callable function
111		*
112		* @param callable $callable
113		*
114		* @return self
115		*/
116	2	public function orderBy(callable $callable): self
117		{
118	2	$clone = clone $this;
119	2	$clone->order_by[] = $callable;
120
121	2	return $clone;
122		}
123
124		/**
125		* Set the Iterator filter method
126		*
127		* @param callable $callable
128		*
129		* @return self
130		*/
131	2	public function where(callable $callable): self
132		{
133	2	$clone = clone $this;
134	2	$clone->where[] = $callable;
135
136	2	return $clone;
137		}
138
139		/**
140		* Set the headers to be used by the RecordSet object
141		*
142		* @param string[] $header
143		*
144		* @return self
145		*/
146	18	public function header(array $header): self
147		{
148	18	$header = $this->filterHeader($header);
149	16	if ($header === $this->header) {
150	2	return $this;
151		}
152
153	14	$clone = clone $this;
154	14	$clone->header = $header;
155
156	14	return $clone;
157		}
158
159		/**
160		* Returns the inner CSV Document Iterator object
161		*
162		* @return RecordSet
163		*/
164	116	public function process(Reader $reader)
165		{
166	116	$header = $this->header;
167	116	if (empty($header)) {
168	102	$header = $this->computeHeader($reader);
169		}
170
171		$normalized = function ($row) {
172	98	return is_array($row) && $row != [null];
173	114	};
174
175	114	$iterator = $this->stripBOM(
176	114	new CallbackFilterIterator($reader->getIterator(), $normalized),
177	114	$reader->getInputBOM(),
178	114	$reader->getEnclosure()
179		);
180	114	$iterator = $this->combineHeader($iterator, $header);
181	114	$iterator = $this->filterRecords($iterator);
182	114	$iterator = $this->orderRecords($iterator);
183
184	114	return new RecordSet(new LimitIterator($iterator, $this->offset, $this->limit), $header);
185		}
186
187		/**
188		* Set the computed RecordSet headers
189		*
190		* @param Reader $reader The CSV document Reader object
191		*
192		* @throws Exception If the header is not found
193		*
194		* @return string[]
195		*/
196	102	protected function computeHeader(Reader $reader)
197		{
198	102	$offset = $reader->getHeaderOffset();
199	102	if (null === $offset) {
200	88	return [];
201		}
202
203	14	$csv = $reader->getIterator();
204	14	$csv->seek($offset);
205	14	$header = $csv->current();
206	14	if (empty($header)) {
207	2	throw new Exception('The header record specified by `Reader::setHeaderOffset` does not exist or is empty');
208		}
209
210	12	if (0 === $offset) {
211	8	$header = $this->removeBOM($header, mb_strlen($reader->getInputBOM()), $reader->getEnclosure());
212		}
213	12	$header = $this->filterHeader($header);
214		array_unshift($this->where, function ($row, $index) use ($offset) {
215	8	return $index !== $offset;
216	12	});
217
218	12	return $header;
219		}
220
221		/**
222		* Remove the BOM sequence from the CSV
223		*
224		* @param Iterator $iterator
225		*
226		* @return Iterator
227		*/
228	114	protected function stripBOM(Iterator $iterator, string $bom, string $enclosure): Iterator
229		{
230	114	if ('' == $bom) {
231	96	return $iterator;
232		}
233
234	18	$bom_length = mb_strlen($bom);
235		$strip_bom = function ($row, $index) use ($bom_length, $enclosure) {
236	18	if (0 != $index \|\| !is_array($row)) {
237	14	return $row;
238		}
239
240	18	return $this->removeBOM($row, $bom_length, $enclosure);
241	18	};
242
243	18	return new MapIterator($iterator, $strip_bom);
244		}
245
246		/**
247		* Add the CSV header if present
248		*
249		* @param Iterator $iterator
250		* @param string[] $header
251		*
252		* @return Iterator
253		*/
254	114	protected function combineHeader(Iterator $iterator, array $header): Iterator
255		{
256	114	if (empty($header)) {
257	88	return $iterator;
258		}
259
260	26	$header_count = count($header);
261		$combine = function (array $row) use ($header_count, $header) {
262	18	if ($header_count != count($row)) {
263	4	$row = array_slice(array_pad($row, $header_count, null), 0, $header_count);
264		}
265
266	18	return array_combine($header, $row);
267	26	};
268
269	26	return new MapIterator($iterator, $combine);
270		}
271
272		/**
273		* Filter the Iterator
274		*
275		* @param Iterator $iterator
276		*
277		* @return Iterator
278		*/
279	114	protected function filterRecords(Iterator $iterator): Iterator
280		{
281		$reducer = function ($iterator, $callable) {
282	14	return new CallbackFilterIterator($iterator, $callable);
283	114	};
284
285	114	return array_reduce($this->where, $reducer, $iterator);
286		}
287
288		/**
289		* Sort the Iterator
290		*
291		* @param Iterator $iterator
292		*
293		* @return Iterator
294		*/
295	114	protected function orderRecords(Iterator $iterator): Iterator
296		{
297	114	if (empty($this->order_by)) {
298	112	return $iterator;
299		}
300
301	2	$obj = new ArrayIterator(iterator_to_array($iterator));
302	2	$obj->uasort(function ($row_a, $row_b) {
303	2	$res = 0;
304	2	foreach ($this->order_by as $compare) {
305	2	if (0 !== ($res = $compare($row_a, $row_b))) {
306	2	break;
307		}
308		}
309
310	2	return $res;
311	2	});
312
313	2	return $obj;
314		}
315		}
316

thephpleague / csv

Pull Request — master (#210)

Statement::computeHeader() B

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