From 46c0fe87e6ef3322a1f044d0aeeea9da63fd3088 Mon Sep 17 00:00:00 2001
From: Bob Nystrom <robert@stuffwithstuff.com>
Date: Thu, 31 Oct 2013 21:49:15 -0700
Subject: [PATCH] Parentheses for grouping.

---
 src/compiler.c    | 8 ++++++++
 test/grammar.wren | 9 +++++++++
 2 files changed, 17 insertions(+)
 create mode 100644 test/grammar.wren

diff --git a/src/compiler.c b/src/compiler.c
index 47f1adee..4d615441 100644
--- a/src/compiler.c
+++ b/src/compiler.c
@@ -583,6 +583,14 @@ void primary(Compiler* compiler)
     string(compiler);
     return;
   }
+
+  // Parentheses.
+  if (match(compiler, TOKEN_LEFT_PAREN))
+  {
+    expression(compiler);
+    consume(compiler, TOKEN_RIGHT_PAREN);
+    return;
+  }
 }
 
 void number(Compiler* compiler)
diff --git a/test/grammar.wren b/test/grammar.wren
new file mode 100644
index 00000000..344b8995
--- /dev/null
+++ b/test/grammar.wren
@@ -0,0 +1,9 @@
+
+// * has higher precedence than +.
+io.write(2 + 3 * 4) // expect: 14
+
+// * has higher precedence than -.
+io.write(20 - 3 * 4) // expect: 8
+
+// Using () for grouping.
+io.write((2 * (6 - (2 + 2)))) // expect: 4