From a5227dab205915d45bc1f1b90ea7a3fe996346a4 Mon Sep 17 00:00:00 2001
From: CreepySkeleton <50968528+CreepySkeleton@users.noreply.github.com>
Date: Fri, 24 May 2019 07:44:28 +0300
Subject: [PATCH] Simplify is_ident function (#104)

It's a way over-complicated
---
 src/runtime.rs | 19 ++++---------------
 1 file changed, 4 insertions(+), 15 deletions(-)

diff --git a/src/runtime.rs b/src/runtime.rs
index 715a877..75337c9 100644
--- a/src/runtime.rs
+++ b/src/runtime.rs
@@ -10,21 +10,10 @@ fn is_ident_continue(c: u8) -> bool {
 }
 
 fn is_ident(token: &str) -> bool {
-    if token.bytes().all(|digit| digit >= b'0' && digit <= b'9') {
-        return false;
-    }
-
-    let mut bytes = token.bytes();
-    let first = bytes.next().unwrap();
-    if !is_ident_start(first) {
-        return false;
-    }
-    for ch in bytes {
-        if !is_ident_continue(ch) {
-            return false;
-        }
-    }
-    true
+    let mut iter = token.bytes();
+    let first_ok = iter.next().map(is_ident_start).unwrap_or(false);
+    
+    first_ok && iter.all(is_ident_continue)
 }
 
 pub fn parse(tokens: &mut TokenStream, span: Span, s: &str) {