<?php
declare(strict_types=1);
namespace GitList\SCM\Diff;
class Parse
{
private const TOKENS = [
'/^diff --c\s/' => 'start',
'/^diff --cc\s/' => 'start',
'/^diff --git\s/' => 'start',
'/^diff -r\s/' => 'start',
'/^new file mode \d+$/' => 'newFile',
'/^deleted file mode \d+$/' => 'deletedFile',
'/^index\s[\da-zA-Z]+\.\.[\da-zA-Z]+(\s(\d+))?$/' => 'index',
'/^index\s([\da-zA-Z]+,)([\da-zA-Z]+\.\.[\da-zA-Z]+)(\s(\d+))?$/' => 'mergeIndex',
'/^---\s/' => 'fromFile',
'/^\+\+\+\s/' => 'toFile',
'/^@@\s+(\-(\d+),?(\d+)?\s+)+(\+(\d+),?(\d+)?\s)+@@/' => 'hunk',
'/^@@@\s+(\-(\d+),?(\d+)?\s+)+(\+(\d+),?(\d+)?\s)+@@@/' => 'hunk',
'/^-/' => 'deletedLine',
'/^\+/' => 'addedLine',
];
protected array $files = [];
protected ?File $currentFile = null;
protected ?Hunk $currentHunk = null;
protected int $oldCounter = 0;
protected int $newCounter = 0;
protected int $deletedLines = 0;
protected int $addedLines = 0;
public function fromRawBlock(string $rawBlock)
{
$rawLines = explode(PHP_EOL, $rawBlock);
$this->files = [];
foreach ($rawLines as $rawLine) {
$matched = false;
foreach (self::TOKENS as $pattern => $action) {
$matches = [];
if (preg_match($pattern, $rawLine, $matches)) {
$this->$action($rawLine, $matches);
$matched = true;
break;
}
}
if (!$matched) {
$this->line($rawLine);
}
}
$this->clearAccumulator();
return $this->files;
}
protected function start(string $line, array $context): void
{
$this->clearAccumulator();
$line = str_replace($context[0], '', $line);
$files = explode(' ', $line);
$filename = str_replace('a/', '', $files[0]);
$this->currentFile = new File($filename);
}
protected function newFile(string $line, array $context): void
{
$this->currentFile->setType(File::TYPE_NEW);
}
protected function deletedFile(string $line, array $context): void
{
$this->currentFile->setType(File::TYPE_DELETED);
}
protected function index(string $line, array $context): void
{
$headerParts = explode(' ', $line);
$this->currentFile->setIndex($headerParts[1]);
}
protected function mergeIndex(string $line, array $context): void
{
$this->currentFile->setIndex($context[2]);
}
protected function fromFile(string $line, array $context): void
{
$this->currentFile->setFrom(trim($line, '- '));
}
protected function toFile(string $line, array $context): void
{
$this->currentFile->setTo(trim($line, '+ '));
}
protected function hunk(string $line, array $context): void
{
if ($this->currentHunk) {
$this->currentFile->addHunk($this->currentHunk);
}
$oldStart = (int) ($context[2] ?? 0);
$oldCount = (int) ($context[3] ?? 0);
$newStart = (int) ($context[5] ?? 0);
$newCount = (int) ($context[6] ?? 0);
$this->oldCounter = $oldStart;
$this->newCounter = $newStart;
$this->deletedLines = 0;
$this->addedLines = 0;
$this->currentHunk = new Hunk($line, $oldStart, $oldCount, $newStart, $newCount);
}
protected function deletedLine(string $line, array $context): void
{
$oldNumber = $this->oldCounter + $this->deletedLines;
$newNumber = $this->newCounter;
$this->currentHunk->addLine(new Line($line, Line::TYPE_DELETE, $oldNumber, $newNumber));
$this->currentFile->increaseDeletions();
$this->deletedLines++;
}
protected function addedLine(string $line, array $context): void
{
$oldNumber = $this->oldCounter;
$newNumber = $this->newCounter + $this->addedLines;
$this->currentHunk->addLine(new Line($line, Line::TYPE_ADD, $oldNumber, $newNumber));
$this->currentFile->increaseAdditions();
$this->addedLines++;
}
protected function line(string $line): void
{
if (!$this->currentHunk || !$this->currentFile) {
return;
}
$oldNumber = $this->oldCounter + $this->deletedLines;
$newNumber = $this->newCounter + $this->addedLines;
$this->currentHunk->addLine(new Line($line, Line::TYPE_NO_CHANGE, $oldNumber, $newNumber));
$this->oldCounter++;
$this->newCounter++;
}
protected function clearAccumulator(): void
{
if ($this->currentFile) {
if ($this->currentHunk) {
$this->currentFile->addHunk($this->currentHunk);
}
$this->files[] = $this->currentFile;
}
$this->currentFile = $this->currentHunk = null;
}
}
