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-rw-r--r--src/spans.rs16
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> {