Repeated structure

src/combinators.rs

@@ -1,15 +1,44 @@
-use crate::Parser;
+use std::marker::PhantomData;
+
+use crate::{ParseResult, Parser};
 
 pub fn repeated<P, I, O, E>(parser: P) -> impl Parser<I, Vec<O>, E>
 where
     P: Parser<I, O, E>,
 {
-    move |input: I| {
+    Repeated::new(parser)
+}
+
+struct Repeated<P, I, O, E>
+where
+    P: Parser<I, O, E>,
+{
+    inner_parser: P,
+    phantom: PhantomData<(I, O, E)>,
+}
+
+impl<P, I, O, E> Repeated<P, I, O, E>
+where
+    P: Parser<I, O, E>,
+{
+    fn new(inner_parser: P) -> Self {
+        Self {
+            inner_parser,
+            phantom: PhantomData,
+        }
+    }
+}
+
+impl<P, I, O, E> Parser<I, Vec<O>, E> for Repeated<P, I, O, E>
+where
+    P: Parser<I, O, E>,
+{
+    fn parse(&self, input: I) -> ParseResult<I, Vec<O>, E> {
         let mut acc = input;
         let mut results = vec![];
 
         loop {
-            match parser.parse(acc) {
+            match self.inner_parser.parse(acc) {
                 Ok((item, rest)) => {
                     results.push(item);
                     acc = rest;