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use crate::{
feature::{FeatureProvider, FeatureRequest},
protocol::{FoldingRange, FoldingRangeKind, FoldingRangeParams},
syntax::SyntaxNode,
workspace::DocumentContent,
};
use async_trait::async_trait;
#[derive(Debug, PartialEq, Eq, Clone, Copy, Default)]
pub struct LatexSectionFoldingProvider;
#[async_trait]
impl FeatureProvider for LatexSectionFoldingProvider {
type Params = FoldingRangeParams;
type Output = Vec<FoldingRange>;
async fn execute<'a>(&'a self, req: &'a FeatureRequest<Self::Params>) -> Self::Output {
let mut foldings = Vec::new();
if let DocumentContent::Latex(table) = &req.current().content {
let sections = &table.sections;
for i in 0..sections.len() {
let current = §ions[i];
if let Some(next) = sections
.iter()
.skip(i + 1)
.find(|sec| current.level >= sec.level)
{
let next_node = &table[next.parent];
if next_node.start().line > 0 {
let current_node = &table[current.parent];
let folding = FoldingRange {
start_line: current_node.end().line,
start_character: Some(current_node.end().character),
end_line: next_node.start().line - 1,
end_character: Some(0),
kind: Some(FoldingRangeKind::Region),
};
foldings.push(folding);
}
}
}
}
foldings
}
}
#[cfg(test)]
mod tests {
use super::*;
use crate::feature::FeatureTester;
use indoc::indoc;
#[tokio::test]
async fn nested() {
let actual_foldings = FeatureTester::new()
.file(
"main.tex",
indoc!(
r#"
\section{Foo}
foo
\subsection{Bar}
bar
\section{Baz}
baz
\section{Qux}
"#
),
)
.main("main.tex")
.test_folding(LatexSectionFoldingProvider)
.await;
let expected_foldings = vec![
FoldingRange {
start_line: 0,
start_character: Some(13),
end_line: 3,
end_character: Some(0),
kind: Some(FoldingRangeKind::Region),
},
FoldingRange {
start_line: 2,
start_character: Some(16),
end_line: 3,
end_character: Some(0),
kind: Some(FoldingRangeKind::Region),
},
FoldingRange {
start_line: 4,
start_character: Some(13),
end_line: 5,
end_character: Some(0),
kind: Some(FoldingRangeKind::Region),
},
];
assert_eq!(actual_foldings, expected_foldings);
}
#[tokio::test]
async fn bibtex() {
let actual_foldings = FeatureTester::new()
.file("main.bib", "")
.main("main.bib")
.test_folding(LatexSectionFoldingProvider)
.await;
assert!(actual_foldings.is_empty());
}
}
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