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Add nested region folding test

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This commit is contained in:
Lukas Wirth 2021-07-15 17:02:45 +02:00
parent 658514d378
commit efea07f31c
1 changed files with 32 additions and 27 deletions
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59
crates/ide/src/folding_ranges.rs
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@ -7,6 +7,9 @@ use syntax::{
SyntaxNode, TextRange, TextSize,
};
const REGION_START: &str = "// region:";
const REGION_END: &str = "// endregion";
#[derive(Debug, PartialEq, Eq)]
pub enum FoldKind {
Comment,
@ -30,8 +33,8 @@ pub struct Fold {
// Feature: Folding
//
// Defines folding regions for curly braced blocks, runs of consecutive import
// statements, and `region` / `endregion` comment markers.
// Defines folding regions for curly braced blocks, runs of consecutive use, mod, const or static
// items, and `region` / `endregion` comment markers.
pub(crate) fn folding_ranges(file: &SourceFile) -> Vec<Fold> {
let mut res = vec![];
let mut visited_comments = FxHashSet::default();
@ -39,8 +42,9 @@ pub(crate) fn folding_ranges(file: &SourceFile) -> Vec<Fold> {
let mut visited_mods = FxHashSet::default();
let mut visited_consts = FxHashSet::default();
let mut visited_statics = FxHashSet::default();
// regions can be nested, here is a LIFO buffer
let mut regions_starts: Vec<TextSize> = vec![];
let mut region_starts: Vec<TextSize> = vec![];
for element in file.syntax().descendants_with_tokens() {
// Fold items that span multiple lines
@ -59,27 +63,23 @@ pub(crate) fn folding_ranges(file: &SourceFile) -> Vec<Fold> {
NodeOrToken::Token(token) => {
// Fold groups of comments
if let Some(comment) = ast::Comment::cast(token) {
if !visited_comments.contains(&comment) {
// regions are not real comments
if comment.text().trim().starts_with("// region:") {
regions_starts.push(comment.syntax().text_range().start());
} else if comment.text().trim().starts_with("// endregion") {
if let Some(region) = regions_starts.pop() {
res.push(Fold {
range: TextRange::new(
region,
comment.syntax().text_range().end(),
),
kind: FoldKind::Region,
})
}
} else {
if let Some(range) =
contiguous_range_for_comment(comment, &mut visited_comments)
{
res.push(Fold { range, kind: FoldKind::Comment })
}
if visited_comments.contains(&comment) {
continue;
}
let text = comment.text().trim_start();
if text.starts_with(REGION_START) {
region_starts.push(comment.syntax().text_range().start());
} else if text.starts_with(REGION_END) {
if let Some(region) = region_starts.pop() {
res.push(Fold {
range: TextRange::new(region, comment.syntax().text_range().end()),
kind: FoldKind::Region,
})
}
} else if let Some(range) =
contiguous_range_for_comment(comment, &mut visited_comments)
{
res.push(Fold { range, kind: FoldKind::Comment })
}
}
}
@ -286,7 +286,9 @@ mod tests {
let (ranges, text) = extract_tags(ra_fixture, "fold");
let parse = SourceFile::parse(&text);
let folds = folding_ranges(&parse.tree());
let mut folds = folding_ranges(&parse.tree());
folds.sort_by_key(|fold| (fold.range.start(), fold.range.end()));
assert_eq!(
folds.len(),
ranges.len(),
@ -294,8 +296,8 @@ mod tests {
);
for (fold, (range, attr)) in folds.iter().zip(ranges.into_iter()) {
assert_eq!(fold.range.start(), range.start());
assert_eq!(fold.range.end(), range.end());
assert_eq!(fold.range.start(), range.start(), "mismatched start of folding ranges");
assert_eq!(fold.range.end(), range.end(), "mismatched end of folding ranges");
let kind = match fold.kind {
FoldKind::Comment => "comment",
@ -525,7 +527,10 @@ const FOO: [usize; 4] = <fold array>[
// 1. some normal comment
<fold region>// region: test
// 2. some normal comment
calling_function(x,y);
<fold region>// region: inner
fn f() {}
// endregion</fold>
fn f2() {}
// endregion: test</fold>
"#,
)