one or more

src/lib.rs

@@ -49,6 +49,30 @@ where
     }
 }
 
+fn one_or_more<P, I, O>(parser: P) -> impl Parser<I, Vec<O>, I>
+where
+    P: Parser<I, O, I>,
+    I: Copy,
+{
+    move |mut input| {
+        let mut results = Vec::new();
+
+        if let Ok((result, rest)) = parser.parse(input) {
+            results.push(result);
+            input = rest;
+        } else {
+            return Err(input);
+        }
+
+        while let Ok((item, rest)) = parser.parse(input) {
+            results.push(item);
+            input = rest;
+        }
+
+        Ok((results, input))
+    }
+}
+
 /// Parses a standard identifier in a programming language
 fn identifier(input: &str) -> ParseResult<&str, String, &str> {
     let mut chars = input.chars();
@@ -100,4 +124,11 @@ mod tests {
         let p = seq(identifier, seq(literal(" "), literal("ruts")));
         assert_matches!(p.parse("fort1 ruts"), Ok((r, "")) if r.0 == "fort1" && r.1 == (" ", "ruts") );
     }
+
+    #[test]
+    fn test_one_or_more() {
+        let p = one_or_more(literal("bongo "));
+        let input = "bongo bongo bongo bongo bongo ";
+        assert_matches!(p.parse(input), Ok((v, "")) if v.len() == 5);
+    }
 }