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Reorganize Document::apply_impl (#11304)
These changes are ported from <https://redirect.github.com/helix-editor/helix/pull/9801>. It's a cleanup of `Document::apply_impl` that uses some early returns to reduce nesting and some reordering of the steps. The early returns bail out of `apply_impl` early if the transaction fails to apply or if the changes are empty (in which case we emit the SelectionDidChange event). It's a somewhat cosmetic refactor that makes the function easier to reason about but it also makes it harder to introduce bugs by mapping positions through empty changesets for example. Co-authored-by: Pascal Kuthe <pascalkuthe@pm.me>
This commit is contained in:
Michael Davis
GitHub
parent
9b65448f53
commit
a1e20a3426
@ -1222,34 +1222,12 @@ fn apply_impl(
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use helix_core::Assoc;
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let old_doc = self.text().clone();
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let changes = transaction.changes();
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if !changes.apply(&mut self.text) {
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return false;
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}
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let success = transaction.changes().apply(&mut self.text);
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if success {
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if emit_lsp_notification {
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helix_event::dispatch(DocumentDidChange {
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doc: self,
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view: view_id,
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old_text: &old_doc,
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});
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}
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for selection in self.selections.values_mut() {
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*selection = selection
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.clone()
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// Map through changes
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.map(transaction.changes())
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// Ensure all selections across all views still adhere to invariants.
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.ensure_invariants(self.text.slice(..));
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}
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for view_data in self.view_data.values_mut() {
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view_data.view_position.anchor = transaction
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.changes()
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.map_pos(view_data.view_position.anchor, Assoc::Before);
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}
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// if specified, the current selection should instead be replaced by transaction.selection
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if changes.is_empty() {
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if let Some(selection) = transaction.selection() {
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self.selections.insert(
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view_id,
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@ -1260,129 +1238,160 @@ fn apply_impl(
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view: view_id,
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});
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}
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self.modified_since_accessed = true;
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return true;
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}
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if !transaction.changes().is_empty() {
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self.version += 1;
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// start computing the diff in parallel
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if let Some(diff_handle) = &self.diff_handle {
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diff_handle.update_document(self.text.clone(), false);
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}
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self.modified_since_accessed = true;
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self.version += 1;
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// generate revert to savepoint
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if !self.savepoints.is_empty() {
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let revert = transaction.invert(&old_doc);
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self.savepoints
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.retain_mut(|save_point| match save_point.upgrade() {
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Some(savepoint) => {
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let mut revert_to_savepoint = savepoint.revert.lock();
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*revert_to_savepoint =
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revert.clone().compose(mem::take(&mut revert_to_savepoint));
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true
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}
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None => false,
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})
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}
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for selection in self.selections.values_mut() {
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*selection = selection
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.clone()
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// Map through changes
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.map(transaction.changes())
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// Ensure all selections across all views still adhere to invariants.
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.ensure_invariants(self.text.slice(..));
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}
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// update tree-sitter syntax tree
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if let Some(syntax) = &mut self.syntax {
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// TODO: no unwrap
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let res = syntax.update(
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old_doc.slice(..),
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self.text.slice(..),
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transaction.changes(),
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);
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if res.is_err() {
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log::error!("TS parser failed, disabling TS for the current buffer: {res:?}");
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self.syntax = None;
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}
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}
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for view_data in self.view_data.values_mut() {
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view_data.view_position.anchor = transaction
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.changes()
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.map_pos(view_data.view_position.anchor, Assoc::Before);
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}
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let changes = transaction.changes();
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// map diagnostics over changes too
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changes.update_positions(self.diagnostics.iter_mut().map(|diagnostic| {
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let assoc = if diagnostic.starts_at_word {
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Assoc::BeforeWord
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} else {
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Assoc::After
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};
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(&mut diagnostic.range.start, assoc)
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}));
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changes.update_positions(self.diagnostics.iter_mut().filter_map(|diagnostic| {
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if diagnostic.zero_width {
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// for zero width diagnostics treat the diagnostic as a point
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// rather than a range
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return None;
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}
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let assoc = if diagnostic.ends_at_word {
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Assoc::AfterWord
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} else {
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Assoc::Before
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};
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Some((&mut diagnostic.range.end, assoc))
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}));
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self.diagnostics.retain_mut(|diagnostic| {
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if diagnostic.zero_width {
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diagnostic.range.end = diagnostic.range.start
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} else if diagnostic.range.start >= diagnostic.range.end {
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return false;
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}
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diagnostic.line = self.text.char_to_line(diagnostic.range.start);
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true
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});
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self.diagnostics.sort_by_key(|diagnostic| {
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(diagnostic.range, diagnostic.severity, diagnostic.provider)
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});
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// Update the inlay hint annotations' positions, helping ensure they are displayed in the proper place
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let apply_inlay_hint_changes = |annotations: &mut Vec<InlineAnnotation>| {
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changes.update_positions(
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annotations
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.iter_mut()
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.map(|annotation| (&mut annotation.char_idx, Assoc::After)),
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);
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};
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self.inlay_hints_oudated = true;
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for text_annotation in self.inlay_hints.values_mut() {
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let DocumentInlayHints {
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id: _,
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type_inlay_hints,
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parameter_inlay_hints,
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other_inlay_hints,
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padding_before_inlay_hints,
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padding_after_inlay_hints,
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} = text_annotation;
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apply_inlay_hint_changes(padding_before_inlay_hints);
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apply_inlay_hint_changes(type_inlay_hints);
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apply_inlay_hint_changes(parameter_inlay_hints);
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apply_inlay_hint_changes(other_inlay_hints);
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apply_inlay_hint_changes(padding_after_inlay_hints);
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}
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if emit_lsp_notification {
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// TODO: move to hook
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// emit lsp notification
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for language_server in self.language_servers() {
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let notify = language_server.text_document_did_change(
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self.versioned_identifier(),
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&old_doc,
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self.text(),
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changes,
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);
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if let Some(notify) = notify {
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tokio::spawn(notify);
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// generate revert to savepoint
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if !self.savepoints.is_empty() {
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let revert = transaction.invert(&old_doc);
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self.savepoints
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.retain_mut(|save_point| match save_point.upgrade() {
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Some(savepoint) => {
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let mut revert_to_savepoint = savepoint.revert.lock();
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*revert_to_savepoint =
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revert.clone().compose(mem::take(&mut revert_to_savepoint));
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true
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}
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None => false,
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})
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}
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// update tree-sitter syntax tree
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if let Some(syntax) = &mut self.syntax {
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// TODO: no unwrap
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let res = syntax.update(
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old_doc.slice(..),
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self.text.slice(..),
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transaction.changes(),
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);
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if res.is_err() {
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log::error!("TS parser failed, disabling TS for the current buffer: {res:?}");
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self.syntax = None;
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}
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}
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// TODO: all of that should likely just be hooks
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// start computing the diff in parallel
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if let Some(diff_handle) = &self.diff_handle {
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diff_handle.update_document(self.text.clone(), false);
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}
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// map diagnostics over changes too
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changes.update_positions(self.diagnostics.iter_mut().map(|diagnostic| {
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let assoc = if diagnostic.starts_at_word {
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Assoc::BeforeWord
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} else {
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Assoc::After
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};
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(&mut diagnostic.range.start, assoc)
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}));
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changes.update_positions(self.diagnostics.iter_mut().filter_map(|diagnostic| {
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if diagnostic.zero_width {
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// for zero width diagnostics treat the diagnostic as a point
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// rather than a range
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return None;
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}
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let assoc = if diagnostic.ends_at_word {
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Assoc::AfterWord
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} else {
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Assoc::Before
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};
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Some((&mut diagnostic.range.end, assoc))
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}));
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self.diagnostics.retain_mut(|diagnostic| {
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if diagnostic.zero_width {
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diagnostic.range.end = diagnostic.range.start
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} else if diagnostic.range.start >= diagnostic.range.end {
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return false;
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}
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diagnostic.line = self.text.char_to_line(diagnostic.range.start);
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true
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});
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self.diagnostics
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.sort_by_key(|diagnostic| (diagnostic.range, diagnostic.severity, diagnostic.provider));
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// Update the inlay hint annotations' positions, helping ensure they are displayed in the proper place
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let apply_inlay_hint_changes = |annotations: &mut Vec<InlineAnnotation>| {
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changes.update_positions(
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annotations
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.iter_mut()
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.map(|annotation| (&mut annotation.char_idx, Assoc::After)),
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);
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};
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self.inlay_hints_oudated = true;
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for text_annotation in self.inlay_hints.values_mut() {
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let DocumentInlayHints {
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id: _,
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type_inlay_hints,
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parameter_inlay_hints,
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other_inlay_hints,
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padding_before_inlay_hints,
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padding_after_inlay_hints,
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} = text_annotation;
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apply_inlay_hint_changes(padding_before_inlay_hints);
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apply_inlay_hint_changes(type_inlay_hints);
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apply_inlay_hint_changes(parameter_inlay_hints);
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apply_inlay_hint_changes(other_inlay_hints);
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apply_inlay_hint_changes(padding_after_inlay_hints);
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}
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helix_event::dispatch(DocumentDidChange {
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doc: self,
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view: view_id,
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old_text: &old_doc,
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});
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// if specified, the current selection should instead be replaced by transaction.selection
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if let Some(selection) = transaction.selection() {
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self.selections.insert(
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view_id,
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selection.clone().ensure_invariants(self.text.slice(..)),
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);
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helix_event::dispatch(SelectionDidChange {
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doc: self,
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view: view_id,
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});
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}
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if emit_lsp_notification {
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// TODO: move to hook
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// emit lsp notification
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for language_server in self.language_servers() {
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let notify = language_server.text_document_did_change(
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self.versioned_identifier(),
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&old_doc,
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self.text(),
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changes,
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);
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if let Some(notify) = notify {
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tokio::spawn(notify);
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}
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}
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}
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success
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true
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}
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fn apply_inner(
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