redox_core/
lib.rs

1//! Core editor primitives.
2//!
3//! This crate provides a rope-based text buffer (via `ropey`) and small, focused
4//! navigation utilities suitable for implementing a Vim-like editor.
5//!
6//! Notes on indexing
7//! - `ropey::Rope` is UTF-8 text stored as a rope.
8//! - Most editing operations are most naturally expressed in **char indices**
9//!   (`usize` counts of Unicode scalar values), because `ropey` exposes many APIs
10//!   in terms of `char` offsets.
11//! - The UI may need **byte indices** for interoperability with external data,
12//!   but those are not used as the primary index type in this crate.
13
14pub mod buffer;
15pub mod io;
16pub mod logic;
17pub mod motion;
18pub mod session;
19pub mod text;
20
21// Prefer using the rope-backed buffer implementation from `buffer`.
22// Re-export the common types here for ergonomic access by downstream crates.
23pub use buffer::{Edit, Pos, Selection, TextBuffer};
24pub use session::{BufferId, BufferKind, BufferMeta, BufferSummary, EditorSession};
25
26#[cfg(test)]
27mod tests {
28    use super::*;
29
30    #[test]
31    fn empty_buffer_has_one_line() {
32        let b = TextBuffer::new();
33        assert_eq!(b.len_lines(), 1);
34        assert_eq!(b.len_chars(), 0);
35    }
36
37    #[test]
38    fn insert_and_delete_selection_smoke() {
39        let mut b = TextBuffer::from_str("ab");
40
41        let sel = Selection::empty(Pos::new(0, 2));
42        let new_cursor = b.insert(sel.cursor, "c");
43        assert_eq!(b.to_string(), "abc");
44        assert_eq!(new_cursor, Pos::new(0, 3));
45
46        let sel2 = Selection::new(Pos::new(0, 1), Pos::new(0, 2));
47        let (cur, did) = b.delete_selection(sel2);
48        assert!(did);
49        assert_eq!(cur, Pos::new(0, 1));
50        assert_eq!(b.to_string(), "ac");
51    }
52}
redox_core/lib.rs

redox_core/
lib.rs
