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<?php
declare(strict_types=1);
/*
* FINE granularity DIFF
*
* (c) 2011 Raymond Hill (http://raymondhill.net/blog/?p=441)
* (c) 2013 Robert Crowe (http://cogpowered.com)
* (c) 2021 Christian Kuhn
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace cogpowered\FineDiff\Render;
use cogpowered\FineDiff\Parser\OpcodesInterface;
abstract class Renderer implements RendererInterface
{
/**
* Covert text based on the provided opcodes.
*
* @param string $from_text
* @param string|OpcodesInterface|mixed $opcodes Throws on non-string and non-OpcodesInterface
* @return string
*/
public function process(string $from_text, $opcodes)
{
// Validate opcodes
if (!is_string($opcodes) && !($opcodes instanceof OpcodesInterface)) {
throw new \InvalidArgumentException('Invalid opcodes type');
}
$opcodes = ($opcodes instanceof OpcodesInterface) ? $opcodes->generate() : $opcodes;
// Holds the generated string that is returned
$output = '';
$opcodes_len = mb_strlen($opcodes);
$from_offset = 0;
$opcodes_offset = 0;
while ($opcodes_offset < $opcodes_len) {
$opcode = mb_substr($opcodes, $opcodes_offset, 1);
$opcodes_offset++;
$n = (int)(mb_substr($opcodes, $opcodes_offset));
if ($n) {
$opcodes_offset += mb_strlen((string)$n);
} else {
$n = 1;
}
if ($opcode === 'c') {
// copy n characters from source
$data = $this->callback('c', $from_text, $from_offset, $n);
$from_offset += $n;
} elseif ($opcode === 'd') {
// delete n characters from source
$data = $this->callback('d', $from_text, $from_offset, $n);
$from_offset += $n;
} else /* if ( $opcode === 'i' ) */ {
// insert n characters from opcodes
$data = $this->callback('i', $opcodes, $opcodes_offset + 1, $n);
$opcodes_offset += 1 + $n;
}
$output .= $data;
}
return $output;
}
}