From ea723d6548ac8944a21f6f038eb5c0fd511e8507 Mon Sep 17 00:00:00 2001
From: "chenyee.cy.huang" <eric.cy.huang@linecorp.com>
Date: Sat, 11 Jan 2025 18:38:49 +0800
Subject: [PATCH] adopt peak to return next optional item

---
 src/format/parse.rs | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/src/format/parse.rs b/src/format/parse.rs
index 6fac97b6f..be088fa75 100644
--- a/src/format/parse.rs
+++ b/src/format/parse.rs
@@ -317,17 +317,10 @@ where
         }};
     }
 
-    // convert items to a pair (current, Option(next_item))
-    // so we can have information about the next item
-    let items: Vec<B> = items.collect::<Vec<_>>();
-    let last_item = items.last();
-    let mut items: Vec<(&B, Option<&B>)> =
-        items.windows(2).map(|arr| (&arr[0], Some(&arr[1]))).collect::<Vec<_>>();
-    if let Some(last_item) = last_item {
-        items.push((last_item, None));
-    }
+    let mut items_iter = items.peekable();
 
-    for (item, next_item) in items {
+    while let Some(item) = items_iter.next() {
+        let next_item = items_iter.peek();
         match *item.borrow() {
             Item::Literal(prefix) => {
                 if s.len() < prefix.len() {