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61 lines
2.3 KiB
Rust
61 lines
2.3 KiB
Rust
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use crate::{
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editable_line::{Edit, EditableLine},
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wchar::prelude::*,
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};
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#[test]
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fn test_undo() {
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let mut line = EditableLine::default();
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let insert = |line: &EditableLine| line.position()..line.position();
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assert!(!line.undo()); // nothing to undo
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assert!(line.text().is_empty());
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assert_eq!(line.position(), 0);
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line.push_edit(Edit::new(0..0, L!("a b c").to_owned()), true);
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assert_eq!(line.text(), L!("a b c").to_owned());
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assert_eq!(line.position(), 5);
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line.set_position(2);
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line.push_edit(Edit::new(2..3, L!("B").to_owned()), true); // replacement right of cursor
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assert_eq!(line.text(), L!("a B c").to_owned());
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line.undo();
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assert_eq!(line.text(), L!("a b c").to_owned());
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assert_eq!(line.position(), 2);
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line.redo();
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assert_eq!(line.text(), L!("a B c").to_owned());
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assert_eq!(line.position(), 3);
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assert!(!line.redo()); // nothing to redo
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line.push_edit(Edit::new(0..2, L!("").to_owned()), true); // deletion left of cursor
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assert_eq!(line.text(), L!("B c").to_owned());
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assert_eq!(line.position(), 1);
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line.undo();
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assert_eq!(line.text(), L!("a B c").to_owned());
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assert_eq!(line.position(), 3);
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line.redo();
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assert_eq!(line.text(), L!("B c").to_owned());
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assert_eq!(line.position(), 1);
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line.push_edit(Edit::new(0..line.len(), L!("a b c").to_owned()), true); // replacement left and right of cursor
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assert_eq!(line.text(), L!("a b c").to_owned());
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assert_eq!(line.position(), 5);
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// Undo coalesced edits
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line.clear();
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line.push_edit(Edit::new(insert(&line), L!("a").to_owned()), true);
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line.push_edit(Edit::new(insert(&line), L!("b").to_owned()), true);
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line.push_edit(Edit::new(insert(&line), L!("c").to_owned()), true);
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line.push_edit(Edit::new(insert(&line), L!(" ").to_owned()), true);
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line.undo();
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line.undo();
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line.redo();
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assert_eq!(line.text(), L!("abc").to_owned());
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// This removes the space insertion from the history, but does not coalesce with the first edit.
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line.push_edit(Edit::new(insert(&line), L!("d").to_owned()), true);
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line.push_edit(Edit::new(insert(&line), L!("e").to_owned()), true);
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assert_eq!(line.text(), L!("abcde").to_owned());
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line.undo();
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assert_eq!(line.text(), L!("abc").to_owned());
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}
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