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make diagnostics stick to word boundaries

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Diagnostics are currently extended if text is inserted at their end. This is
desirable when inserting text after an identifier. For example consider:

let foo = 2;
    --- unused variable

Renaming the identifier should extend the diagnostic:

let foobar = 2;
    ------ unused variable

This is currently implemented in helix but as a consequence adding whitespaces
or a type hint also extends the diagnostic:

let foo      = 2;
    -------- unused variable
let foo: Bar = 2;
    -------- unused variable

In these cases the diagnostic should remain unchanged:

let foo      = 2;
    --- unused variable
let foo: Bar = 2;
    --- unused variable

As a heuristic helix will now only extend diagnostics that end on a word char
if new chars are appended to the word (so not for punctuation/ whitespace).
The idea for this mapping was inspired for the word level tracking vscode uses
for many positions. While VSCode doesn't currently update diagnostics after
receiving publishDiagnostic it does use this system for inlay hints for example.
Similarly, the new association mechanism implemented here can be used for word
level tracking of inlay hints.

A similar mapping function is implemented for word starts. Together
these can be used to make a diagnostic stick to a word. If that word
is removed that diagnostic is automatically removed too. This is the exact
same behavior VSCode inlay hints eixibit.
This commit is contained in:
Pascal Kuthe 2023-03-26 18:14:42 +02:00 • committed by Blaž Hrastnik
parent 8653e1b02f
commit 515ef17207
4 changed files with 112 additions and 28 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
helix-core/src/diagnostic.rs
View file

@ -39,6 +39,10 @@ pub enum DiagnosticTag {
#[derive(Debug, Clone)]
pub struct Diagnostic {
pub range: Range,
// whether this diagnostic ends at the end of(or inside) a word
pub ends_at_word: bool,
pub starts_at_word: bool,
pub zero_width: bool,
pub line: usize,
pub message: String,
pub severity: Option<Severity>,

87
helix-core/src/transaction.rs
View file

@ -1,7 +1,7 @@
use ropey::RopeSlice;
use smallvec::SmallVec;
use crate::{Range, Rope, Selection, Tendril};
use crate::{chars::char_is_word, Range, Rope, Selection, Tendril};
use std::{borrow::Cow, iter::once};
/// (from, to, replacement)
@ -23,6 +23,30 @@ pub enum Operation {
pub enum Assoc {
Before,
After,
/// Acts like `After` if a word character is inserted
/// after the position, otherwise acts like `Before`
AfterWord,
/// Acts like `Before` if a word character is inserted
/// before the position, otherwise acts like `After`
BeforeWord,
}
impl Assoc {
/// Whether to stick to gaps
fn stay_at_gaps(self) -> bool {
!matches!(self, Self::BeforeWord | Self::AfterWord)
}
fn insert_offset(self, s: &str) -> usize {
let chars = s.chars().count();
match self {
Assoc::After => chars,
Assoc::AfterWord => s.chars().take_while(|&c| char_is_word(c)).count(),
// return position before inserted text
Assoc::Before => 0,
Assoc::BeforeWord => chars - s.chars().rev().take_while(|&c| char_is_word(c)).count(),
}
}
}
#[derive(Debug, Default, Clone, PartialEq, Eq)]
@ -415,8 +439,6 @@ impl ChangeSet {
map!(|pos, _| (old_end > pos).then_some(new_pos), i);
}
Insert(s) => {
let ins = s.chars().count();
// a subsequent delete means a replace, consume it
if let Some((_, Delete(len))) = iter.peek() {
iter.next();
@ -424,13 +446,13 @@ impl ChangeSet {
old_end = old_pos + len;
// in range of replaced text
map!(
|pos, assoc| (old_end > pos).then(|| {
|pos, assoc: Assoc| (old_end > pos).then(|| {
// at point or tracking before
if pos == old_pos || assoc == Assoc::Before {
if pos == old_pos && assoc.stay_at_gaps() {
new_pos
} else {
// place to end of insert
new_pos + ins
new_pos + assoc.insert_offset(s)
}
}),
i
@ -438,20 +460,15 @@ impl ChangeSet {
} else {
// at insert point
map!(
|pos, assoc| (old_pos == pos).then(|| {
|pos, assoc: Assoc| (old_pos == pos).then(|| {
// return position before inserted text
if assoc == Assoc::Before {
new_pos
} else {
// after text
new_pos + ins
}
new_pos + assoc.insert_offset(s)
}),
i
);
}
new_pos += ins;
new_pos += s.chars().count();
}
}
old_pos = old_end;
@ -884,6 +901,48 @@ mod test {
let mut positions = [4, 2];
cs.update_positions(positions.iter_mut().map(|pos| (pos, Assoc::After)));
assert_eq!(positions, [4, 2]);
// stays at word boundary
let cs = ChangeSet {
changes: vec![
Retain(2), // <space><space>
Insert(" ab".into()),
Retain(2), // cd
Insert("de ".into()),
],
len: 4,
len_after: 10,
};
assert_eq!(cs.map_pos(2, Assoc::BeforeWord), 3);
assert_eq!(cs.map_pos(4, Assoc::AfterWord), 9);
let cs = ChangeSet {
changes: vec![
Retain(1), // <space>
Insert(" b".into()),
Delete(1), // c
Retain(1), // d
Insert("e ".into()),
Delete(1), // <space>
],
len: 5,
len_after: 7,
};
assert_eq!(cs.map_pos(1, Assoc::BeforeWord), 2);
assert_eq!(cs.map_pos(3, Assoc::AfterWord), 5);
let cs = ChangeSet {
changes: vec![
Retain(1), // <space>
Insert("a".into()),
Delete(2), // <space>b
Retain(1), // d
Insert("e".into()),
Delete(1), // f
Retain(1), // <space>
],
len: 5,
len_after: 7,
};
assert_eq!(cs.map_pos(2, Assoc::BeforeWord), 1);
assert_eq!(cs.map_pos(4, Assoc::AfterWord), 4);
}
#[test]

11
helix-term/src/application.rs
View file

@ -1,6 +1,7 @@
use arc_swap::{access::Map, ArcSwap};
use futures_util::Stream;
use helix_core::{
chars::char_is_word,
diagnostic::{DiagnosticTag, NumberOrString},
path::get_relative_path,
pos_at_coords, syntax, Selection,
@ -811,7 +812,6 @@ impl Application {
log::warn!("lsp position out of bounds - {:?}", diagnostic);
return None;
};
let severity =
diagnostic.severity.map(|severity| match severity {
DiagnosticSeverity::ERROR => Error,
@ -863,8 +863,17 @@ impl Application {
Vec::new()
};
let ends_at_word = start != end
&& end != 0
&& text.get_char(end - 1).map_or(false, char_is_word);
let starts_at_word = start != end
&& text.get_char(start).map_or(false, char_is_word);
Some(Diagnostic {
range: Range { start, end },
ends_at_word,
starts_at_word,
zero_width: start == end,
line: diagnostic.range.start.line as usize,
message: diagnostic.message.clone(),
severity,

38
helix-view/src/document.rs
View file

@ -1213,20 +1213,32 @@ impl Document {
let changes = transaction.changes();
changes.update_positions(
self.diagnostics
.iter_mut()
.map(|diagnostic| (&mut diagnostic.range.start, Assoc::After)),
);
changes.update_positions(
self.diagnostics
.iter_mut()
.map(|diagnostic| (&mut diagnostic.range.end, Assoc::After)),
);
// map state.diagnostics over changes::map_pos too
for diagnostic in &mut self.diagnostics {
diagnostic.line = self.text.char_to_line(diagnostic.range.start);
// map diagnostics over changes too
changes.update_positions(self.diagnostics.iter_mut().map(|diagnostic| {
let assoc = if diagnostic.starts_at_word {
Assoc::BeforeWord
} else {
Assoc::After
};
(&mut diagnostic.range.start, assoc)
}));
changes.update_positions(self.diagnostics.iter_mut().map(|diagnostic| {
let assoc = if diagnostic.ends_at_word {
Assoc::AfterWord
} else {
Assoc::Before
};
(&mut diagnostic.range.end, assoc)
}));
self.diagnostics.retain_mut(|diagnostic| {
if diagnostic.range.start > diagnostic.range.end
|| (!diagnostic.zero_width && diagnostic.range.start == diagnostic.range.end)
{
return false;
}
diagnostic.line = self.text.char_to_line(diagnostic.range.start);
true
});
self.diagnostics
.sort_unstable_by_key(|diagnostic| diagnostic.range);