CsvReader::getFields() - Code Metrics - ddeboer/data-import - Measure and Improve Code Quality continuously with Scrutinizer

CsvReader::getFields() A
last analyzed 2017-08-31 09:23 UTC

↳ Parent: CsvReader

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
dl	0
loc	4
rs	10
c	0
b	0
f	0
ccs	2
cts	2
cp	1
cc	1
eloc	2
nc	1
nop	0
crap	1

<?php

namespace Ddeboer\DataImport\Reader;

use Ddeboer\DataImport\Exception\DuplicateHeadersException;

/**
 * Reads a CSV file, using as little memory as possible
 *
 * @author David de Boer <[email protected]>
 */
class CsvReader implements CountableReader, \SeekableIterator
{
    const DUPLICATE_HEADERS_INCREMENT = 1;
    const DUPLICATE_HEADERS_MERGE     = 2;

    /**
     * Number of the row that contains the column names
     *
     * @var integer
     */
    protected $headerRowNumber;

    /**
     * CSV file
     *
     * @var \SplFileObject
     */
    protected $file;

    /**
     * Column headers as read from the CSV file
     *
     * @var array
     */
    protected $columnHeaders = [];

    /**
     * Number of column headers, stored and re-used for performance
     *
     * In case of duplicate headers, this is always the number of unmerged headers.
     *
     * @var integer
     */
    protected $headersCount;

    /**
     * Total number of rows in the CSV file
     *
     * @var integer
     */
    protected $count;

    /**
     * Faulty CSV rows
     *
     * @var array
     */
    protected $errors = [];

    /**
     * Strict parsing - skip any lines mismatching header length
     *
     * @var boolean
     */
    protected $strict = true;

    /**
     * How to handle duplicate headers
     *
     * @var integer
     */
    protected $duplicateHeadersFlag;

    /**
     * @param \SplFileObject $file
     * @param string         $delimiter
     * @param string         $enclosure
     * @param string         $escape
     */
    public function __construct(\SplFileObject $file, $delimiter = ',', $enclosure = '"', $escape = '\\')
    {
        ini_set('auto_detect_line_endings', true);

        $this->file = $file;
        $this->file->setFlags(
            \SplFileObject::READ_CSV |
            \SplFileObject::SKIP_EMPTY |
            \SplFileObject::READ_AHEAD |
            \SplFileObject::DROP_NEW_LINE
        );
        $this->file->setCsvControl(
            $delimiter,
            $enclosure,
            $escape
        );
    }

    /**
     * Return the current row as an array
     *
     * If a header row has been set, an associative array will be returned
     *
     * @return array
     */
    public function current()
    {
        // If the CSV has no column headers just return the line
        if (empty($this->columnHeaders)) {
            return $this->file->current();
        }

        // Since the CSV has column headers use them to construct an associative array for the columns in this line
        do {
            $line = $this->file->current();

            // In non-strict mode pad/slice the line to match the column headers
            if (!$this->isStrict()) {
                if ($this->headersCount > count($line)) {
                    $line = array_pad($line, $this->headersCount, null); // Line too short
                } else {
                    $line = array_slice($line, 0, $this->headersCount); // Line too long
                }
            }

            // See if values for duplicate headers should be merged
            if (self::DUPLICATE_HEADERS_MERGE === $this->duplicateHeadersFlag) {
                $line = $this->mergeDuplicates($line);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
            }

            // Count the number of elements in both: they must be equal.
            if (count($this->columnHeaders) === count($line)) {
                return array_combine(array_keys($this->columnHeaders), $line);
            }

            // They are not equal, so log the row as error and skip it.
            if ($this->valid()) {
                $this->errors[$this->key()] = $line;
                $this->next();
            }
        } while($this->valid());

        return null;
    }

    /**
     * Get column headers
     *
     * @return array
     */
    public function getColumnHeaders()
    {
        return array_keys($this->columnHeaders);
    }

    /**
     * Set column headers
     *
     * @param array $columnHeaders
     */
    public function setColumnHeaders(array $columnHeaders)
    {
        $this->columnHeaders = array_count_values($columnHeaders);
        $this->headersCount = count($columnHeaders);
    }

    /**
     * Set header row number
     *
     * @param integer $rowNumber  Number of the row that contains column header names
     * @param integer $duplicates How to handle duplicates (optional). One of:
     *                        - CsvReader::DUPLICATE_HEADERS_INCREMENT;
     *                        increments duplicates (dup, dup1, dup2 etc.)
     *                        - CsvReader::DUPLICATE_HEADERS_MERGE; merges
     *                        values for duplicate headers into an array
     *                        (dup => [value1, value2, value3])
     *
     * @throws DuplicateHeadersException If duplicate headers are encountered
     *                                   and no duplicate handling has been
     *                                   specified
     */
    public function setHeaderRowNumber($rowNumber, $duplicates = null)
    {
        $this->duplicateHeadersFlag = $duplicates;
        $this->headerRowNumber = $rowNumber;
        $headers = $this->readHeaderRow($rowNumber);

        $this->setColumnHeaders($headers);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
    }

    /**
     * Rewind the file pointer
     *
     * If a header row has been set, the pointer is set just below the header
     * row. That way, when you iterate over the rows, that header row is
     * skipped.
     */
    public function rewind()
    {
        $this->file->rewind();
        if (null !== $this->headerRowNumber) {
            $this->file->seek($this->headerRowNumber + 1);
        }
    }

    /**
     * {@inheritdoc}
     */
    public function count()
    {
        if (null === $this->count) {
            $position = $this->key();

            $this->count = iterator_count($this);

            $this->seek($position);
        }

        return $this->count;
    }

    /**
     * {@inheritdoc}
     */
    public function next()
    {
        $this->file->next();
    }

    /**
     * {@inheritdoc}
     */
    public function valid()
    {
        return $this->file->valid();
    }

    /**
     * {@inheritdoc}
     */
    public function key()
    {
        return $this->file->key();
    }

    /**
     * {@inheritdoc}
     */
    public function seek($pointer)
    {
        $this->file->seek($pointer);
    }

    /**
     * {@inheritdoc}
     */
    public function getFields()
    {
        return $this->getColumnHeaders();
    }

    /**
     * Get a row
     *
     * @param integer $number Row number
     *
     * @return array
     */
    public function getRow($number)
    {
        $this->seek($number);

        return $this->current();
    }

    /**
     * Get rows that have an invalid number of columns
     *
     * @return array
     */
    public function getErrors()
    {
        if (0 === $this->key()) {
            // Iterator has not yet been processed, so do that now
            foreach ($this as $row) { /* noop */ }

        }

        return $this->errors;
    }

    /**
     * Does the reader contain any invalid rows?
     *
     * @return boolean
     */
    public function hasErrors()
    {
        return count($this->getErrors()) > 0;
    }

    /**
     * Should the reader use strict parsing?
     *
     * @return boolean
     */
    public function isStrict()
    {
        return $this->strict;
    }

    /**
     * Set strict parsing
     *
     * @param boolean $strict
     */
    public function setStrict($strict)
    {
        $this->strict = $strict;
    }

    /**
     * Read header row from CSV file
     *
     * @param integer $rowNumber Row number
     *
     * @return array
     *
     * @throws DuplicateHeadersException
     */
    protected function readHeaderRow($rowNumber)
    {
        $this->file->seek($rowNumber);
        $headers = $this->file->current();

        // Test for duplicate column headers
        $diff = array_diff_assoc($headers, array_unique($headers));
        if (count($diff) > 0) {
            switch ($this->duplicateHeadersFlag) {
                case self::DUPLICATE_HEADERS_INCREMENT:
                    $headers = $this->incrementHeaders($headers);
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
                    // Fall through
                case self::DUPLICATE_HEADERS_MERGE:
                    break;
                default:
                    throw new DuplicateHeadersException($diff);
            }
        }

        return $headers;
    }

    /**
     * Add an increment to duplicate headers
     *
     * So the following line:
     * |duplicate|duplicate|duplicate|
     * |first    |second   |third    |
     *
     * Yields value:
     * $duplicate => 'first', $duplicate1 => 'second', $duplicate2 => 'third'
     *
     * @param array $headers
     *
     * @return array
     */
    protected function incrementHeaders(array $headers)
    {
        $incrementedHeaders = [];
        foreach (array_count_values($headers) as $header => $count) {
            if ($count > 1) {
                $incrementedHeaders[] = $header;
                for ($i = 1; $i < $count; $i++) {
                    $incrementedHeaders[] = $header . $i;
                }
            } else {
                $incrementedHeaders[] = $header;
            }
        }

        return $incrementedHeaders;
    }

    /**
     * Merges values for duplicate headers into an array
     *
     * So the following line:
     * |duplicate|duplicate|duplicate|
     * |first    |second   |third    |
     *
     * Yields value:
     * $duplicate => ['first', 'second', 'third']
     *
     * @param array $line
     *
     * @return array
     */
    protected function mergeDuplicates(array $line)
    {
        $values = [];

        $i = 0;
        foreach ($this->columnHeaders as $count) {
            if (1 === $count) {
                $values[] = $line[$i];
            } else {
                $values[] = array_slice($line, $i, $count);
            }

            $i += $count;
        }

        return $values;
    }
}


1		<?php
2
3		namespace Ddeboer\DataImport\Reader;
4
5		use Ddeboer\DataImport\Exception\DuplicateHeadersException;
6
7		/**
8		* Reads a CSV file, using as little memory as possible
9		*
10		* @author David de Boer <[email protected]>
11		*/
12		class CsvReader implements CountableReader, \SeekableIterator
13		{
14		const DUPLICATE_HEADERS_INCREMENT = 1;
15		const DUPLICATE_HEADERS_MERGE = 2;
16
17		/**
18		* Number of the row that contains the column names
19		*
20		* @var integer
21		*/
22		protected $headerRowNumber;
23
24		/**
25		* CSV file
26		*
27		* @var \SplFileObject
28		*/
29		protected $file;
30
31		/**
32		* Column headers as read from the CSV file
33		*
34		* @var array
35		*/
36		protected $columnHeaders = [];
37
38		/**
39		* Number of column headers, stored and re-used for performance
40		*
41		* In case of duplicate headers, this is always the number of unmerged headers.
42		*
43		* @var integer
44		*/
45		protected $headersCount;
46
47		/**
48		* Total number of rows in the CSV file
49		*
50		* @var integer
51		*/
52		protected $count;
53
54		/**
55		* Faulty CSV rows
56		*
57		* @var array
58		*/
59		protected $errors = [];
60
61		/**
62		* Strict parsing - skip any lines mismatching header length
63		*
64		* @var boolean
65		*/
66		protected $strict = true;
67
68		/**
69		* How to handle duplicate headers
70		*
71		* @var integer
72		*/
73		protected $duplicateHeadersFlag;
74
75		/**
76		* @param \SplFileObject $file
77		* @param string $delimiter
78		* @param string $enclosure
79		* @param string $escape
80		*/
81	19	public function __construct(\SplFileObject $file, $delimiter = ',', $enclosure = '"', $escape = '\\')
82		{
83	19	ini_set('auto_detect_line_endings', true);
84
85	19	$this->file = $file;
86	19	$this->file->setFlags(
87	19	\SplFileObject::READ_CSV \|
88	19	\SplFileObject::SKIP_EMPTY \|
89	19	\SplFileObject::READ_AHEAD \|
90		\SplFileObject::DROP_NEW_LINE
91	19	);
92	19	$this->file->setCsvControl(
93	19	$delimiter,
94	19	$enclosure,
95		$escape
96	19	);
97	19	}
98
99		/**
100		* Return the current row as an array
101		*
102		* If a header row has been set, an associative array will be returned
103		*
104		* @return array
105		*/
106	11	public function current()
107		{
108		// If the CSV has no column headers just return the line
109	11	if (empty($this->columnHeaders)) {
110		return $this->file->current();
111		}
112
113		// Since the CSV has column headers use them to construct an associative array for the columns in this line
114		do {
115	11	$line = $this->file->current();
116
117		// In non-strict mode pad/slice the line to match the column headers
118	11	if (!$this->isStrict()) {
119	3	if ($this->headersCount > count($line)) {
120	2	$line = array_pad($line, $this->headersCount, null); // Line too short
121	2	} else {
122	3	$line = array_slice($line, 0, $this->headersCount); // Line too long
123		}
124	3	}
125
126		// See if values for duplicate headers should be merged
127	11	if (self::DUPLICATE_HEADERS_MERGE === $this->duplicateHeadersFlag) {
128	1	$line = $this->mergeDuplicates($line);
		0 ignored issues – show Bug introduced 2015-12-09 23:34 UTC by Report Bug Copy Issue Report It seems like `$line` can also be of type `string`; however, `Ddeboer\DataImport\Reade...ader::mergeDuplicates()` does only seem to accept `array`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
129	1	}
130
131		// Count the number of elements in both: they must be equal.
132	11	if (count($this->columnHeaders) === count($line)) {
133	10	return array_combine(array_keys($this->columnHeaders), $line);
134		}
135
136		// They are not equal, so log the row as error and skip it.
137	3	if ($this->valid()) {
138	3	$this->errors[$this->key()] = $line;
139	3	$this->next();
140	3	}
141	3	} while($this->valid());
142
143	2	return null;
144		}
145
146		/**
147		* Get column headers
148		*
149		* @return array
150		*/
151	4	public function getColumnHeaders()
152		{
153	4	return array_keys($this->columnHeaders);
154		}
155
156		/**
157		* Set column headers
158		*
159		* @param array $columnHeaders
160		*/
161	15	public function setColumnHeaders(array $columnHeaders)
162		{
163	15	$this->columnHeaders = array_count_values($columnHeaders);
164	15	$this->headersCount = count($columnHeaders);
165	15	}
166
167		/**
168		* Set header row number
169		*
170		* @param integer $rowNumber Number of the row that contains column header names
171		* @param integer $duplicates How to handle duplicates (optional). One of:
172		* - CsvReader::DUPLICATE_HEADERS_INCREMENT;
173		* increments duplicates (dup, dup1, dup2 etc.)
174		* - CsvReader::DUPLICATE_HEADERS_MERGE; merges
175		* values for duplicate headers into an array
176		* (dup => [value1, value2, value3])
177		*
178		* @throws DuplicateHeadersException If duplicate headers are encountered
179		* and no duplicate handling has been
180		* specified
181		*/
182	11	public function setHeaderRowNumber($rowNumber, $duplicates = null)
183		{
184	11	$this->duplicateHeadersFlag = $duplicates;
185	11	$this->headerRowNumber = $rowNumber;
186	11	$headers = $this->readHeaderRow($rowNumber);
187
188	10	$this->setColumnHeaders($headers);
		0 ignored issues – show Bug introduced 2016-02-16 14:37 UTC by Report Bug Copy Issue Report It seems like `$headers` defined by `$this->readHeaderRow($rowNumber)` on line `186` can also be of type `string`; however, `Ddeboer\DataImport\Reade...der::setColumnHeaders()` does only seem to accept `array`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
189	10	}
190
191		/**
192		* Rewind the file pointer
193		*
194		* If a header row has been set, the pointer is set just below the header
195		* row. That way, when you iterate over the rows, that header row is
196		* skipped.
197		*/
198	17	public function rewind()
199		{
200	17	$this->file->rewind();
201	17	if (null !== $this->headerRowNumber) {
202	10	$this->file->seek($this->headerRowNumber + 1);
203	10	}
204	17	}
205
206		/**
207		* {@inheritdoc}
208		*/
209	9	public function count()
210		{
211	9	if (null === $this->count) {
212	9	$position = $this->key();
213
214	9	$this->count = iterator_count($this);
215
216	9	$this->seek($position);
217	9	}
218
219	9	return $this->count;
220		}
221
222		/**
223		* {@inheritdoc}
224		*/
225	15	public function next()
226		{
227	15	$this->file->next();
228	15	}
229
230		/**
231		* {@inheritdoc}
232		*/
233	15	public function valid()
234		{
235	15	return $this->file->valid();
236		}
237
238		/**
239		* {@inheritdoc}
240		*/
241	12	public function key()
242		{
243	12	return $this->file->key();
244		}
245
246		/**
247		* {@inheritdoc}
248		*/
249	10	public function seek($pointer)
250		{
251	10	$this->file->seek($pointer);
252	10	}
253
254		/**
255		* {@inheritdoc}
256		*/
257	1	public function getFields()
258		{
259	1	return $this->getColumnHeaders();
260		}
261
262		/**
263		* Get a row
264		*
265		* @param integer $number Row number
266		*
267		* @return array
268		*/
269	2	public function getRow($number)
270		{
271	2	$this->seek($number);
272
273	2	return $this->current();
274		}
275
276		/**
277		* Get rows that have an invalid number of columns
278		*
279		* @return array
280		*/
281	5	public function getErrors()
282		{
283	5	if (0 === $this->key()) {
284		// Iterator has not yet been processed, so do that now
285	5	foreach ($this as $row) { /* noop */ }
		0 ignored issues – show Unused Code introduced 2015-12-09 23:34 UTC by Report Bug Copy Issue Report This `foreach` statement is empty and can be removed. This check looks for `foreach` loops that have no statements or where all statements have been commented out. This may be the result of changes for debugging or the code may simply be obsolete. Consider removing the loop. Loading history...
286	5	}
287
288	5	return $this->errors;
289		}
290
291		/**
292		* Does the reader contain any invalid rows?
293		*
294		* @return boolean
295		*/
296	5	public function hasErrors()
297		{
298	5	return count($this->getErrors()) > 0;
299		}
300
301		/**
302		* Should the reader use strict parsing?
303		*
304		* @return boolean
305		*/
306	11	public function isStrict()
307		{
308	11	return $this->strict;
309		}
310
311		/**
312		* Set strict parsing
313		*
314		* @param boolean $strict
315		*/
316	6	public function setStrict($strict)
317		{
318	6	$this->strict = $strict;
319	6	}
320
321		/**
322		* Read header row from CSV file
323		*
324		* @param integer $rowNumber Row number
325		*
326		* @return array
327		*
328		* @throws DuplicateHeadersException
329		*/
330	11	protected function readHeaderRow($rowNumber)
331		{
332	11	$this->file->seek($rowNumber);
333	11	$headers = $this->file->current();
334
335		// Test for duplicate column headers
336	11	$diff = array_diff_assoc($headers, array_unique($headers));
337	11	if (count($diff) > 0) {
338	3	switch ($this->duplicateHeadersFlag) {
339	3	case self::DUPLICATE_HEADERS_INCREMENT:
340	1	$headers = $this->incrementHeaders($headers);
		0 ignored issues – show Bug introduced 2015-12-09 23:34 UTC by Report Bug Copy Issue Report It seems like `$headers` can also be of type `string`; however, `Ddeboer\DataImport\Reade...der::incrementHeaders()` does only seem to accept `array`, maybe add an additional type check? If a method or function can return multiple different values and unless you are sure that you only can receive a single value in this context, we recommend to add an additional type check: /** * @return array\|string */ function returnsDifferentValues($x) { if ($x) { return 'foo'; } return array(); } $x = returnsDifferentValues($y); if (is_array($x)) { // $x is an array. } If this a common case that PHP Analyzer should handle natively, please let us know by opening an issue. Loading history...
341		// Fall through
342	3	case self::DUPLICATE_HEADERS_MERGE:
343	2	break;
344	1	default:
345	1	throw new DuplicateHeadersException($diff);
346	3	}
347	2	}
348
349	10	return $headers;
350		}
351
352		/**
353		* Add an increment to duplicate headers
354		*
355		* So the following line:
356		* \|duplicate\|duplicate\|duplicate\|
357		* \|first \|second \|third \|
358		*
359		* Yields value:
360		* $duplicate => 'first', $duplicate1 => 'second', $duplicate2 => 'third'
361		*
362		* @param array $headers
363		*
364		* @return array
365		*/
366	1	protected function incrementHeaders(array $headers)
367		{
368	1	$incrementedHeaders = [];
369	1	foreach (array_count_values($headers) as $header => $count) {
370	1	if ($count > 1) {
371	1	$incrementedHeaders[] = $header;
372	1	for ($i = 1; $i < $count; $i++) {
373	1	$incrementedHeaders[] = $header . $i;
374	1	}
375	1	} else {
376	1	$incrementedHeaders[] = $header;
377		}
378	1	}
379
380	1	return $incrementedHeaders;
381		}
382
383		/**
384		* Merges values for duplicate headers into an array
385		*
386		* So the following line:
387		* \|duplicate\|duplicate\|duplicate\|
388		* \|first \|second \|third \|
389		*
390		* Yields value:
391		* $duplicate => ['first', 'second', 'third']
392		*
393		* @param array $line
394		*
395		* @return array
396		*/
397	1	protected function mergeDuplicates(array $line)
398		{
399	1	$values = [];
400
401	1	$i = 0;
402	1	foreach ($this->columnHeaders as $count) {
403	1	if (1 === $count) {
404	1	$values[] = $line[$i];
405	1	} else {
406	1	$values[] = array_slice($line, $i, $count);
407		}
408
409	1	$i += $count;
410	1	}
411
412	1	return $values;
413		}
414		}
415

ddeboer / data-import

CsvReader::getFields() A last analyzed 2017-08-31 09:23 UTC

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CsvReader::getFields() A
last analyzed 2017-08-31 09:23 UTC