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<?php |
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/** |
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* This file is part of graze/console-diff-renderer. |
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* |
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* Copyright (c) 2017 Nature Delivered Ltd. <https://www.graze.com> |
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* |
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* For the full copyright and license information, please view the LICENSE |
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* file that was distributed with this source code. |
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* |
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* @license https://github.com/graze/console-diff-renderer/blob/master/LICENSE.md |
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* @link https://github.com/graze/console-diff-renderer |
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*/ |
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namespace Graze\DiffRenderer\Diff; |
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class FirstDiff |
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{ |
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/** |
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* Loop through each line, and produce a difference report of what to write out to the terminal |
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* |
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* Assumes the beginning of old and new are the same line |
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* |
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* @param string[] $old |
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* @param string[] $new |
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* |
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* @return array [[:col, :str]] |
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*/ |
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public function lines(array $old, array $new) |
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{ |
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$out = []; |
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$newLen = count($new); |
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$oldLen = count($old); |
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for ($i = 0; $i < $oldLen || $i < $newLen; $i++) { |
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if ($i >= $oldLen) { |
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$out[] = ['col' => 0, 'str' => $new[$i]]; // write out the entire line for extra lines |
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} elseif ($i >= $newLen) { |
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$out[] = ['col' => 0, 'str' => '']; // clear the line if the new array has less entries than the old one |
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} else { |
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$col = $this->firstDifference($old[$i], $new[$i]); |
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if ($col === -1) { |
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$out[] = null; |
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} else { |
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$out[] = ['col' => $col, 'str' => mb_substr($new[$i], $col)]; |
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} |
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} |
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} |
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return $out; |
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} |
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/** |
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* Looks through a line to find the character to of the first difference between the 2 strings. |
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* |
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* If no difference is found, returns -1 |
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* |
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* @param string $old |
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* @param string $new |
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* |
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* @return int |
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*/ |
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public function firstDifference($old, $new) |
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{ |
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// loop through old and new character by character and compare |
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$oldLen = mb_strlen($old); |
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$newLen = mb_strlen($new); |
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if ($oldLen === 0) { |
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return 0; |
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} |
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for ($i = 0; $i < $oldLen && $i < $newLen; $i++) { |
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if (mb_substr($old, $i, 1) !== mb_substr($new, $i, 1)) { |
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return $i; |
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} |
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} |
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if ($i < $oldLen || $i < $newLen) { |
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return $i; |
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} |
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return -1; |
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} |
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} |
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graze /
console-diff-renderer
