1 files changed, 5 insertions, 72 deletions

diff --git a/src/mdast.rs b/src/mdast.rs
index 79a39dd..8b5b74d 100644
--- a/src/mdast.rs
+++ b/src/mdast.rs
@@ -1,83 +1,14 @@
-//! [mdast][] syntax tree.
+//! markdown syntax tree: [mdast][].
 //!
 //! [mdast]: https://github.com/syntax-tree/mdast
 
+use crate::unist::Position;
 use alloc::{
     fmt,
     string::{String, ToString},
     vec::Vec,
 };
 
-/// One place in a source file.
-#[derive(Clone, Eq, PartialEq)]
-pub struct Point {
-    /// 1-indexed integer representing a line in a source file.
-    pub line: usize,
-    /// 1-indexed integer representing a column in a source file.
-    pub column: usize,
-    /// 0-indexed integer representing a character in a source file.
-    pub offset: usize,
-}
-
-impl Point {
-    #[must_use]
-    pub fn new(line: usize, column: usize, offset: usize) -> Point {
-        Point {
-            line,
-            column,
-            offset,
-        }
-    }
-}
-
-impl fmt::Debug for Point {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{}:{} ({})", self.line, self.column, self.offset)
-    }
-}
-
-/// Location of a node in a source file.
-#[derive(Clone, Eq, PartialEq)]
-pub struct Position {
-    /// Represents the place of the first character of the parsed source region.
-    pub start: Point,
-    /// Represents the place of the first character after the parsed source
-    /// region, whether it exists or not.
-    pub end: Point,
-}
-
-impl Position {
-    #[must_use]
-    pub fn new(
-        start_line: usize,
-        start_column: usize,
-        start_offset: usize,
-        end_line: usize,
-        end_column: usize,
-        end_offset: usize,
-    ) -> Position {
-        Position {
-            start: Point::new(start_line, start_column, start_offset),
-            end: Point::new(end_line, end_column, end_offset),
-        }
-    }
-}
-
-impl fmt::Debug for Position {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(
-            f,
-            "{}:{}-{}:{} ({}-{})",
-            self.start.line,
-            self.start.column,
-            self.end.line,
-            self.end.column,
-            self.start.offset,
-            self.end.offset
-        )
-    }
-}
-
 /// Explicitness of a reference.
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum ReferenceKind {
@@ -370,7 +301,8 @@ impl Node {
         }
     }
 
-    pub fn position(&mut self) -> Option<&Position> {
+    #[must_use]
+    pub fn position(&self) -> Option<&Position> {
         match self {
             Node::Root(x) => x.position.as_ref(),
             Node::BlockQuote(x) => x.position.as_ref(),
@@ -1204,6 +1136,7 @@ pub struct MdxJsxAttribute {
 #[cfg(test)]
 mod tests {
     use super::*;
+    use crate::unist::{Point, Position};
     use alloc::{string::ToString, vec};
 
     #[test]