From 23ca1189832b3613e71ebc081aff52ef55d2e4c3 Mon Sep 17 00:00:00 2001
From: Victor <melnikukr@mail.ru>
Date: Thu, 16 Apr 2015 13:51:13 +0300
Subject: [PATCH] =?UTF-8?q?=D0=9F=D0=BE=D0=B4=D0=B4=D0=B5=D1=80=D0=B6?=
 =?UTF-8?q?=D0=BA=D0=B0=20=D1=83=D0=BD=D0=B0=D1=80=D0=BD=D1=8B=D1=85=20?=
 =?UTF-8?q?=D0=BE=D0=BF=D0=B5=D1=80=D0=B0=D1=86=D0=B8=D0=B9?=
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---
 src/com/annimon/everlastingsummer/Parser.java | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/src/com/annimon/everlastingsummer/Parser.java b/src/com/annimon/everlastingsummer/Parser.java
index 87ed8f9..5a3683d 100644
--- a/src/com/annimon/everlastingsummer/Parser.java
+++ b/src/com/annimon/everlastingsummer/Parser.java
@@ -411,6 +411,16 @@ public final class Parser {
     }
     
     private Expression expression() {
+        return unary();
+    }
+    
+    private Expression unary() {
+        if (match(TokenType.MINUS)) {
+            return new ValueExpression( -primary().eval() );
+        }
+        if (match(TokenType.PLUS)) {
+            return primary();
+        }
         return primary();
     }