initial version

lib/BackTraceFormatter.php

@@ -0,0 +1,66 @@
+<?php
+
+declare(strict_types=1);
+/**
+ * @copyright Copyright (c) 2022 Robin Appelman <robin@icewind.nl>
+ *
+ * @license GNU AGPL version 3 or any later version
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ */
+
+namespace OCA\LockPick;
+
+
+class BackTraceFormatter {
+	private function filePrefix(array $backtrace): string {
+		$files = array_map(function (array $item) {
+			return $item['file'] ?? '';
+		}, $backtrace);
+		if (count($files) < 2) {
+			return $files[0] ?? '';
+		}
+		$i = 0;
+		while (isset($files[0][$i]) && array_reduce($files, function ($every, $item) use ($files, $i) {
+				return $every && $item[$i] == $files[0][$i];
+			}, true)) {
+			$i++;
+		}
+		return substr($files[0], 0, $i);
+	}
+
+	public function format(array $backtrace, string $indent = ""): string {
+		$prefixLength = strlen($this->filePrefix($backtrace));
+		$backtrace = array_map(function ($trace) use ($prefixLength) {
+			return [
+				'line' => isset($trace['file']) ? (substr($trace['file'], $prefixLength) . ' ' . $trace['line']) : '--',
+				'call' => isset($trace['class']) ? ($trace['class'] . $trace['type'] . $trace['function']) : $trace['function'],
+			];
+		}, $backtrace);
+		$callLength = max(array_map(function ($item) {
+			return strlen($item['call']);
+		}, $backtrace));
+
+		$output = "";
+		foreach ($backtrace as $trace) {
+			if ($output !== "") {
+				$output .= "\n";
+			}
+			$output .= $indent . str_pad($trace['call'], $callLength) . ' - ' . $trace['line'];
+		}
+
+		return $output;
+	}
+}