test: Add option to pass a file to bench.php for ad-hoc micro benching

Change-Id: If86b1806e6f56b1fd3509c509bb73812d060564e

Author: Krinkle

test/CSSJanusBenchmark.php

@@ -1,9 +1,17 @@
 <?php
 
 class CSSJanusBenchmark {
+	private $fixtures;
+
+	/**
+	 * @param null|array<string,string> $fixtures Map from label to input CSS
+	 */
+	public function __construct(array $fixtures = null) {
+		$this->fixtures = $fixtures ?? self::getFixtures();
+	}
 
 	public function run() {
-		foreach (self::getFixtures() as $name => $data) {
+		foreach ($this->fixtures as $name => $data) {
 			$iterations = 10_000;
 			$total = 0;
 			$max = -INF;

test/bench.php

@@ -3,4 +3,11 @@
 require_once __DIR__ . '/../vendor/autoload.php';
 require_once __DIR__ . '/CSSJanusBenchmark.php';
 
-( new CSSJanusBenchmark )->run();
+$fixtures = null;
+if (isset($argv[1])) {
+	$name = basename($argv[1]);
+	$data = file_get_contents($argv[1]);
+	$fixtures = [ $name => $data ];
+}
+
+( new CSSJanusBenchmark($fixtures) )->run();