diff --git a/src/helper.rs b/src/helper.rs
index 6c99dd4..cc08c9a 100644
--- a/src/helper.rs
+++ b/src/helper.rs
@@ -81,3 +81,45 @@
         tap!($i, $name: call!($f) => $e);
     };
 }
+
+macro_rules! separated_list {
+    ($i:expr, punct!($sep:expr), $f:expr) => {
+        $crate::helper::separated_list($i, $sep, $f)
+    };
+}
+
+pub fn separated_list<'a, T>(mut input: &'a str, sep: &'static str, f: fn(&'a str) -> IResult<&'a str, T>) -> IResult<&'a str, Vec<T>> {
+    let mut res = Vec::new();
+
+    // get the first element
+    match f(input) {
+        IResult::Error => IResult::Done(input, Vec::new()),
+        IResult::Done(i, o) => {
+            if i.len() == input.len() {
+                IResult::Error
+            } else {
+                res.push(o);
+                input = i;
+
+                // get the separator first
+                while let IResult::Done(i2, _) = punct(input, sep) {
+                    if i2.len() == input.len() {
+                        break;
+                    }
+
+                    // get the element next
+                    if let IResult::Done(i3, o3) = f(i2) {
+                        if i3.len() == i2.len() {
+                            break;
+                        }
+                        res.push(o3);
+                        input = i3;
+                    } else {
+                        break;
+                    }
+                }
+                IResult::Done(input, res)
+            }
+        }
+    }
+}
diff --git a/src/nom.rs b/src/nom.rs
index cc372ec..a79eade 100644
--- a/src/nom.rs
+++ b/src/nom.rs
@@ -301,57 +301,6 @@
     };
 }
 
-macro_rules! separated_list {
-    ($i:expr, $sep:ident!( $($args:tt)* ), $submac:ident!( $($args2:tt)* )) => {{
-        let mut res = ::std::vec::Vec::new();
-        let mut input = $i;
-
-// get the first element
-        match $submac!(input, $($args2)*) {
-            $crate::nom::IResult::Error => $crate::nom::IResult::Done(input, ::std::vec::Vec::new()),
-            $crate::nom::IResult::Done(i, o) => {
-                if i.len() == input.len() {
-                    $crate::nom::IResult::Error
-                } else {
-                    res.push(o);
-                    input = i;
-
-// get the separator first
-                    while let $crate::nom::IResult::Done(i2, _) = $sep!(input, $($args)*) {
-                        if i2.len() == input.len() {
-                            break;
-                        }
-
-// get the element next
-                        if let $crate::nom::IResult::Done(i3, o3) = $submac!(i2, $($args2)*) {
-                            if i3.len() == i2.len() {
-                                break;
-                            }
-                            res.push(o3);
-                            input = i3;
-                        } else {
-                            break;
-                        }
-                    }
-                    $crate::nom::IResult::Done(input, res)
-                }
-            }
-        }
-    }};
-
-    ($i:expr, $submac:ident!( $($args:tt)* ), $g:expr) => {
-        separated_list!($i, $submac!($($args)*), call!($g));
-    };
-
-    ($i:expr, $f:expr, $submac:ident!( $($args:tt)* )) => {
-        separated_list!($i, call!($f), $submac!($($args)*));
-    };
-
-    ($i:expr, $f:expr, $g:expr) => {
-        separated_list!($i, call!($f), call!($g));
-    };
-}
-
 macro_rules! separated_nonempty_list {
     ($i:expr, $sep:ident!( $($args:tt)* ), $submac:ident!( $($args2:tt)* )) => {{
         let mut res   = ::std::vec::Vec::new();