pub struct Change { /* private fields */ }Expand description
The outcome of a committed transaction, an undo, or a redo.
A consumer holding a derived cache — a parse, a layout — is told what moved and re-does that much. Nothing has to compare two buffers to find out, which is the cost this type exists to remove, and nothing has to guess how far the damage spread, which is the correctness problem underneath that cost.
Implementations§
Source§impl Change
impl Change
Sourcepub fn edits(&self) -> Option<&[Edit]>
pub fn edits(&self) -> Option<&[Edit]>
The replaced regions, in the new text’s coordinates.
None when the change cannot be described that precisely: undoing or
redoing a group that several transactions were folded into means several
coordinate spaces, and a list of ranges that were each correct at a
different moment is worse than no list at all. A committed transaction
always reports its edits; only a coalesced group’s undo declines to.
Self::rows is always populated.
Sourcepub fn rows(&self) -> Range<usize> ⓘ
pub fn rows(&self) -> Range<usize> ⓘ
Rows of the new text whose content is not what it was, so a consumer
holding a derived cache re-derives that much. Rows after it are
unchanged in content but have moved by Self::line_delta.
Exact for a single transaction. Widened, never narrowed, for a coalesced group — over-reporting costs work, under-reporting costs correctness.
Sourcepub fn line_delta(&self) -> isize
pub fn line_delta(&self) -> isize
How the text’s row count changed. Positive when rows were added.
Trait Implementations§
impl Eq for Change
impl StructuralPartialEq for Change
Auto Trait Implementations§
impl Freeze for Change
impl RefUnwindSafe for Change
impl Send for Change
impl Sync for Change
impl Unpin for Change
impl UnsafeUnpin for Change
impl UnwindSafe for Change
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