1 files changed, 13 insertions, 3 deletions
diff --git a/src/spans.rs b/src/spans.rs
index 4333bd1..c3d269d 100644
--- a/src/spans.rs
+++ b/src/spans.rs
@@ -12,7 +12,7 @@
 
 use std::ops::Range;
 
-use crate::Reader;
+use crate::{IntoReader, Reader};
 
 /// A trait to be implemented by readers that track their own position.
 pub trait GetPos {
@@ -23,9 +23,19 @@ pub trait GetPos {
 /// Wraps a [`Reader`] so that it implements [`GetPos`].
 pub struct PosTrackingReader<R> {
     /// The wrapped reader.
-    pub reader: R,
+    reader: R,
     /// The current position.
-    pub position: usize,
+    position: usize,
+}
+
+impl<R> PosTrackingReader<R> {
+    /// Wraps the given [`Reader`] so that it implements [`GetPos`] with the position starting from 0.
+    pub fn new<'a>(into_reader: impl IntoReader<'a, Reader = R>) -> Self {
+        Self {
+            reader: into_reader.into_reader(),
+            position: 0,
+        }
+    }
 }
 
 impl<R> GetPos for PosTrackingReader<R> {