s9e\RegexpBuilder\Passes\MergeSuffix

Complexity

Total Complexity

11

Size/Duplication

Total Lines	79
Duplicated Lines	0 %

Coupling/Cohesion

Components	1
Dependencies	1

Test Coverage

Coverage

100%

Importance

Changes

0

4 Methods

Rating	Name	Duplication	Size	Complexity
A	processStrings()	0	17	3
A	hasMatchingSuffix()	0	13	3
A	isEligible()	0	4	2
A	pop()	0	18	3

<?php

/**
* @package   s9e\RegexpBuilder
* @copyright Copyright (c) 2016 The s9e Authors
* @license   http://www.opensource.org/licenses/mit-license.php The MIT License
*/
namespace s9e\RegexpBuilder\Passes;

class MergeSuffix extends AbstractPass
{
	/**
	* {@inheritdoc}
	*/
	protected function processStrings(array $strings)
	{
		if (!$this->isEligible($strings))
		{
			return $strings;
		}

		$newString = [];
		while ($this->hasMatchingSuffix($strings))
		{
			array_unshift($newString, end($strings[0]));
			$strings = $this->pop($strings);
		}
		array_unshift($newString, $strings);

		return [$newString];
	}

	/**
	* Test whether all given strings have the same last element
	*
	* @param  array[] $strings
	* @return bool
	*/
	protected function hasMatchingSuffix(array $strings)
	{
		$suffix = end($strings[1]);
		foreach ($strings as $string)
		{
			if (end($string) !== $suffix)
			{
				return false;
			}
		}

		return ($suffix !== false);
	}

	/**
	* Test whether this pass can be run on given list of strings
	*
	* @param  array[] $strings
	* @return bool
	*/
	protected function isEligible(array $strings)
	{
		return (count($strings) > 1 && $this->hasMatchingSuffix($strings));
	}

	/**
	* Remove the last element of every string
	*
	* @param  array[] $strings Original strings
	* @return array[]          Processed strings
	*/
	protected function pop(array $strings)
	{
		$cnt = count($strings);
		$i   = $cnt;
		while (--$i >= 0)
		{
			array_pop($strings[$i]);
		}

		// Remove empty elements then prepend one back at the start of the array if applicable
		$strings = array_filter($strings);
		if (count($strings) < $cnt)
		{
			array_unshift($strings, []);
		}

		return $strings;
	}
}