From eef6d3fdd53b850ca00868b39c343e0417ae554b Mon Sep 17 00:00:00 2001
From: Alireza6677 <alireza6677@gmail.com>
Date: Sun, 10 May 2020 15:36:44 +0430
Subject: [PATCH] Now it should be really fixed

---
 source/calcool/parser.d | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/source/calcool/parser.d b/source/calcool/parser.d
index 76348cd..7bb9a5d 100644
--- a/source/calcool/parser.d
+++ b/source/calcool/parser.d
@@ -67,7 +67,11 @@ public:
         return inside;
     }
 
-    Expression parseExpression(Precedence precedence = Precedence.START) {
+    Expression parseExpression() {
+        return parseExpression(Precedence.START, true);
+    }
+
+    Expression parseExpression(Precedence precedence = Precedence.START, bool start = false) {
         auto token = consume();
         if (auto parselet = token.type in prefixParselets) {
             auto left = parselet.parse(this, token);
@@ -77,6 +81,11 @@ public:
                 InfixParselet infix = infixParselets[token.type];
                 left = infix.parse(this, left, token);
             }
+
+            if (start && input.length > 0 && input.front().type != TokenType.EOL) {
+                input.length = 0;
+                throw new ParseException("Syntax error");
+            }
             return left;
 
         } else {
@@ -119,7 +128,7 @@ public:
         import std.conv : to;
 
         input = lexer.nextLine(exp);
-        return parseExpression().evaluate().to!string;
+        return parseExpression(Precedence.START, true).evaluate().to!string;
     }
 
 }