Added backtrace formatter class.

src/Formatter/Backtrace_Formatter.php

@@ -0,0 +1,55 @@
+<?php
+
+namespace Rarst\Laps\Formatter;
+
+/**
+ * Formatter to adjust WP backtrace output to be more short and concise.
+ */
+class Backtrace_Formatter {
+
+	/** @var array $skip String matches to omit. */
+	protected static $skip = [
+		'wp-blog-header.php',
+		'wp-load.php',
+		'wp-config.php',
+		'admin.php',
+		'locate_template',
+		'load_template',
+		'_wp_get_current_user',
+		'WP_Hook',
+	];
+
+	/**
+	 * @param array|string $backtrace Backtrace input as produced by WP.
+	 *
+	 * @return array
+	 */
+	public function format( $backtrace ) {
+
+		if ( is_string( $backtrace ) ) {
+			$backtrace = explode( ', ', $backtrace );
+		}
+
+		// TODO shorten includes.
+
+		$backtrace = array_filter( $backtrace, [ $this, 'filter' ] );
+
+		return $backtrace;
+	}
+
+	/**
+	 * @param string $item Backtrace item.
+	 *
+	 * @return bool Keep or drop.
+	 */
+	protected function filter( $item ) {
+
+		foreach ( self::$skip as $match ) {
+			if ( false !== strpos( $item, $match ) ) {
+				return false;
+			}
+		}
+
+		return true;
+	}
+}