From cc42fe2c84ce7f8af83670f85dfe9bc93d5098b3 Mon Sep 17 00:00:00 2001
From: NerdyPepper <akshayoppiliappan@gmail.com>
Date: Wed, 20 Mar 2019 22:40:26 +0530
Subject: simplify complicated construct

---
 src/main.rs | 20 +++++++++-----------
 1 file changed, 9 insertions(+), 11 deletions(-)

diff --git a/src/main.rs b/src/main.rs
index 5f75843..bff6201 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -162,16 +162,6 @@ fn lexer(input: &str) -> Result<Vec<Token>, String> {
     Ok(result)
 }
 
-fn tilt_until(operators: &mut Vec<Token>, output: &mut Vec<Token>, stop: Token) -> bool {
-    while let Some(token) = operators.pop() {
-        if token == stop {
-            return true;
-        }
-        output.push(token)
-    }
-    false
-}
-
 fn to_postfix(tokens: Vec<Token>) -> Result<Vec<Token>, String> {
     let mut postfixed: Vec<Token> = vec![];
     let mut op_stack: Vec<Token> = vec![];
@@ -212,7 +202,15 @@ fn to_postfix(tokens: Vec<Token>) -> Result<Vec<Token>, String> {
                 op_stack.push(token);
             },
             Token::RParen => {
-                if !tilt_until(&mut op_stack, &mut postfixed, Token::LParen) {
+                let mut push_until: bool = false;
+                while let Some(token) = op_stack.pop() {
+                    if token == Token::LParen {
+                        push_until = true;
+                        break;
+                    }
+                    postfixed.push(token)
+                }
+                if !push_until {
                     return Err(String::from("Mismatched ')'"));
                 }
             }
-- 
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