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@ -41,11 +41,26 @@ impl ChangeSet {
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// TODO: from iter
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#[must_use]
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fn len_after(&self) -> usize {
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use Operation::*;
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let mut len = 0;
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for change in &self.changes {
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match change {
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Retain(i) => len += i,
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Insert(s) => len += s.chars().count(),
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Delete(_) => (),
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}
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}
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len
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}
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/// Combine two changesets together.
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/// In other words, If `this` goes `docA` → `docB` and `other` represents `docB` → `docC`, the
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/// returned value will represent the change `docA` → `docC`.
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pub fn compose(self, other: ChangeSet) -> Result<Self, ()> {
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// TODO: len before b should match len after a
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debug_assert!(self.len_after() == other.len);
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let len = self.changes.len();
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@ -182,10 +197,7 @@ impl ChangeSet {
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/// Returns a new changeset that reverts this one. Useful for `undo` implementation.
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/// The document parameter expects the original document before this change was applied.
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pub fn invert(&self, original_doc: &Rope) -> Self {
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if original_doc.len_chars() != self.len {
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panic!("Document length mismatch");
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// return false;
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}
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assert!(original_doc.len_chars() == self.len);
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let mut changes = Vec::with_capacity(self.changes.len());
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let mut pos = 0;
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