<?php

namespace PHPCensor\Helper;

/**

* Provides some basic diff processing functionality.

*/

class Diff

{

/**

* Take a diff

* @param string $diff

* @return array

*/

public function getLinePositions($diff)

{

if (empty($diff)) {

return null;

}

$rtn = [];

$diffLines = explode(PHP_EOL, $diff);

while (count($diffLines)) {

$line = array_shift($diffLines);

if (substr($line, 0, 2) == '@@') {

array_unshift($diffLines, $line);

break;

}

}

$lineNumber = 0;

$position = 0;

foreach ($diffLines as $diffLine) {

if (preg_match('/@@\s+\-[0-9]+\,[0-9]+\s+\+([0-9]+)\,([0-9]+)/', $diffLine, $matches)) {

$lineNumber = (int)$matches[1] - 1;

}

$rtn[$lineNumber] = $position;

$lineNumber++;

$position++;

}

return $rtn;

}

}