Added phpbench for benchmarking

benchmarks/LexerBench.php

@@ -0,0 +1,35 @@
+<?php
+namespace GraphQL\Benchmarks;
+
+use GraphQL\Language\Lexer;
+use GraphQL\Language\Source;
+use GraphQL\Language\Token;
+use GraphQL\Type\Introspection;
+
+/**
+ * @BeforeMethods({"setUp"})
+ * @OutputTimeUnit("milliseconds", precision=3)
+ */
+class LexerBench
+{
+    private $introQuery;
+
+    public function setUp()
+    {
+        $this->introQuery = new Source(Introspection::getIntrospectionQuery());
+    }
+
+    /**
+     * @Warmup(2)
+     * @Revs(100)
+     * @Iterations(5)
+     */
+    public function benchIntrospectionQuery()
+    {
+        $lexer = new Lexer($this->introQuery);
+
+        do {
+            $token = $lexer->nextToken();
+        } while ($token->kind !== Token::EOF);
+    }
+}

composer.json

@@ -24,7 +24,8 @@
   },
   "autoload-dev": {
     "psr-4": {
-      "GraphQL\\Tests\\": "tests/"
+      "GraphQL\\Tests\\": "tests/",
+      "GraphQL\\Benchmarks\\": "benchmarks/"
     }
   }
 }

phpbench.json

@@ -0,0 +1,6 @@
+{
+  "bootstrap": "vendor/autoload.php",
+  "path": "benchmarks",
+  "retry_threshold": 5,
+  "time_unit": "milliseconds"
+}