From 2763f09cc4747bcfe7d73381f5c8f136dd913d75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rapha=C3=ABl=20Emourgeon?= <raphael.emourgeon@gmail.com>
Date: Sun, 12 Jul 2015 22:12:33 +0200
Subject: [PATCH 1/2] Add ^ operator for power.

---
 Arithmetic.pp           |  6 +++++-
 Test/Unit/Arithmetic.pp |  6 +++++-
 Visitor/Arithmetic.php  | 10 ++++++++++
 3 files changed, 20 insertions(+), 2 deletions(-)

diff --git a/Arithmetic.pp b/Arithmetic.pp
index 2e25e1f..fd4abf7 100644
--- a/Arithmetic.pp
+++ b/Arithmetic.pp
@@ -52,6 +52,7 @@
 %token  minus     \-|−
 %token  times     \*|×
 %token  div       /|÷
+%token  pow       \^
 %token  constant  [A-Z_]+[A-Z0-9_]+
 %token  id        \w+
 
@@ -65,7 +66,10 @@
     ternary() ( ::times:: #multiplication expression() )?
 
 ternary:
-    term() ( ::div:: #division expression() )?
+    quaternary() ( ::div:: #division expression() )?
+
+quaternary:
+    term() ( ::pow:: #power expression() )?
 
 term:
     ( ::bracket_:: expression() ::_bracket:: #group )
diff --git a/Test/Unit/Arithmetic.pp b/Test/Unit/Arithmetic.pp
index a615516..fd2743b 100644
--- a/Test/Unit/Arithmetic.pp
+++ b/Test/Unit/Arithmetic.pp
@@ -51,6 +51,7 @@
 %token  minus     \-
 %token  times     \*
 %token  div       /
+%token  pow       \^
 %token  constant  [A-Z_]+[A-Z0-9_]+
 %token  id        \w+
 
@@ -64,7 +65,10 @@
     ternary() ( ::times:: #multiplication expression() )?
 
 ternary:
-    term() ( ::div:: #division expression() )?
+    quaternary() ( ::div:: #division expression() )?
+
+quaternary:
+    term() ( ::pow:: #power expression() )?
 
 term:
     ( ::bracket_:: expression() ::_bracket:: #group )
diff --git a/Visitor/Arithmetic.php b/Visitor/Arithmetic.php
index 1534192..901da74 100644
--- a/Visitor/Arithmetic.php
+++ b/Visitor/Arithmetic.php
@@ -209,6 +209,16 @@ public function visit(
 
                 break;
 
+            case '#power':
+                $children[0]->accept($this, $a, $eldnah);
+
+                $acc = function ($b) use ($a, $acc) {
+                    return $acc(pow($a(), $b));
+                };
+
+                $children[1]->accept($this, $acc, $eldnah);
+                break;
+
             case '#fakegroup':
             case '#group':
                 $children[0]->accept($this, $a, $eldnah);

From d08ba387cf5d5ac40021585fe3e0a208d117ba7f Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Rapha=C3=ABl=20Emourgeon?= <raphael.emourgeon@gmail.com>
Date: Mon, 13 Jul 2015 09:22:52 +0200
Subject: [PATCH 2/2] Fix coding style.

---
 Visitor/Arithmetic.php | 1 +
 1 file changed, 1 insertion(+)

diff --git a/Visitor/Arithmetic.php b/Visitor/Arithmetic.php
index 901da74..e9253bc 100644
--- a/Visitor/Arithmetic.php
+++ b/Visitor/Arithmetic.php
@@ -217,6 +217,7 @@ public function visit(
                 };
 
                 $children[1]->accept($this, $acc, $eldnah);
+                
                 break;
 
             case '#fakegroup':