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✏️ Editing: Controls.php

<?php
/**
* This file is part of the League.csv library
*
* @license http://opensource.org/licenses/MIT
* @link https://github.com/thephpleague/csv/
* @version 8.0.0
* @package League.csv
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace League\Csv\Config;

use CallbackFilterIterator;
use InvalidArgumentException;
use LimitIterator;
use SplFileObject;

/**
 *  A trait to configure and check CSV file and content
 *
 * @package League.csv
 * @since  6.0.0
 *
 */
trait Controls
{
    /**
     * the field delimiter (one character only)
     *
     * @var string
     */
    protected $delimiter = ',';

/**
     * the field enclosure character (one character only)
     *
     * @var string
     */
    protected $enclosure = '"';

/**
     * the field escape character (one character only)
     *
     * @var string
     */
    protected $escape = '\\';

/**
     * newline character
     *
     * @var string
     */
    protected $newline = "\n";

/**
     * Sets the field delimiter
     *
     * @param string $delimiter
     *
     * @throws InvalidArgumentException If $delimiter is not a single character
     *
     * @return $this
     */
    public function setDelimiter($delimiter)
    {
        if (!$this->isValidCsvControls($delimiter)) {
            throw new InvalidArgumentException('The delimiter must be a single character');
        }
        $this->delimiter = $delimiter;

return $this;
    }

/**
     * Tell whether the submitted string is a valid CSV Control character
     *
     * @param string $str The submitted string
     *
     * @return bool
     */
    protected function isValidCsvControls($str)
    {
        return 1 == mb_strlen($str);
    }

/**
     * Returns the current field delimiter
     *
     * @return string
     */
    public function getDelimiter()
    {
        return $this->delimiter;
    }

/**
     * 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_rows    Detection is made using $nb_rows of the CSV
     *
     * @return array
     */
    public function fetchDelimitersOccurrence(array $delimiters, $nb_rows = 1)
    {
        $nb_rows = $this->validateInteger($nb_rows, 1, 'The number of rows to consider must be a valid positive integer');
        $filterRow = function ($row) {
            return is_array($row) && count($row) > 1;
        };
        $delimiters = array_unique(array_filter($delimiters, [$this, 'isValidCsvControls']));
        $csv = $this->getIterator();
        $res = [];
        foreach ($delimiters as $delim) {
            $csv->setCsvControl($delim, $this->enclosure, $this->escape);
            $iterator = new CallbackFilterIterator(new LimitIterator($csv, 0, $nb_rows), $filterRow);
            $res[$delim] = count(iterator_to_array($iterator, false), COUNT_RECURSIVE);
        }
        arsort($res, SORT_NUMERIC);

return $res;
    }

/**
     * Validate an integer
     *
     * @param int    $int
     * @param int    $minValue
     * @param string $errorMessage
     *
     * @throws InvalidArgumentException If the value is invalid
     *
     * @return int
     */
    protected function validateInteger($int, $minValue, $errorMessage)
    {
        if (false === ($int = filter_var($int, FILTER_VALIDATE_INT, ['options' => ['min_range' => $minValue]]))) {
            throw new InvalidArgumentException($errorMessage);
        }
        return $int;
    }

/**
     * Returns the CSV Iterator
     *
     * @return SplFileObject
     */
    abstract public function getIterator();

/**
     * Sets the field enclosure
     *
     * @param string $enclosure
     *
     * @throws InvalidArgumentException If $enclosure is not a single character
     *
     * @return $this
     */
    public function setEnclosure($enclosure)
    {
        if (!$this->isValidCsvControls($enclosure)) {
            throw new InvalidArgumentException('The enclosure must be a single character');
        }
        $this->enclosure = $enclosure;

return $this;
    }

/**
     * Returns the current field enclosure
     *
     * @return string
     */
    public function getEnclosure()
    {
        return $this->enclosure;
    }

/**
     * Sets the field escape character
     *
     * @param string $escape
     *
     * @throws InvalidArgumentException If $escape is not a single character
     *
     * @return $this
     */
    public function setEscape($escape)
    {
        if (!$this->isValidCsvControls($escape)) {
            throw new InvalidArgumentException('The escape character must be a single character');
        }
        $this->escape = $escape;

return $this;
    }

/**
     * Returns the current field escape character
     *
     * @return string
     */
    public function getEscape()
    {
        return $this->escape;
    }

/**
     * Sets the newline sequence characters
     *
     * @param string $newline
     *
     * @return static
     */
    public function setNewline($newline)
    {
        $this->newline = (string) $newline;

return $this;
    }

/**
     * Returns the current newline sequence characters
     *
     * @return string
     */
    public function getNewline()
    {
        return $this->newline;
    }
}

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