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|
use base_db::{semantics::Span, Document, DocumentData};
use rowan::{ast::AstNode, TextRange, TextSize};
use syntax::latex;
#[derive(Debug, PartialEq, Eq, Clone)]
pub struct EnvironmentMatch {
pub name: Span,
pub full_range: TextRange,
}
pub fn find_environments(document: &Document, offset: TextSize) -> Vec<EnvironmentMatch> {
let DocumentData::Tex(data) = &document.data else {
return Vec::new();
};
let root = latex::SyntaxNode::new_root(data.green.clone());
let Some(token) = root.token_at_offset(offset).right_biased() else {
return Vec::new();
};
let mut results = Vec::new();
for environment in token
.parent_ancestors()
.filter_map(latex::Environment::cast)
{
let Some(name) = environment
.begin()
.and_then(|begin| begin.name())
.and_then(|group| group.key())
.map(|name| Span::from(&name))
else {
continue;
};
let full_range = latex::small_range(&environment);
results.push(EnvironmentMatch { name, full_range });
}
results.reverse();
results
}
#[cfg(test)]
mod tests {
use expect_test::{expect, Expect};
use test_utils::fixture::Fixture;
use crate::find_environments;
fn check(fixture: &str, expect: Expect) {
let fixture = Fixture::parse(fixture);
let workspace = fixture.workspace;
let document = workspace.iter().next().unwrap();
let offset = fixture.documents[0].cursor.unwrap();
let results = find_environments(&document, offset);
expect.assert_debug_eq(&results);
}
#[test]
fn test_simple() {
check(
r#"
%! main.tex
\begin{a}
|
\end{a}
"#,
expect![[r#"
[
EnvironmentMatch {
name: Span(
"a",
7..8,
),
full_range: 0..17,
},
]
"#]],
);
}
#[test]
fn test_nested() {
check(
r#"
%! main.tex
\begin{a}
\begin{b}
\begin{c}
|
\end{c}
\end{b}
\begin{d}
\end{d}
\end{a}"#,
expect![[r#"
[
EnvironmentMatch {
name: Span(
"a",
7..8,
),
full_range: 0..103,
},
EnvironmentMatch {
name: Span(
"b",
21..22,
),
full_range: 14..69,
},
EnvironmentMatch {
name: Span(
"c",
39..40,
),
full_range: 32..57,
},
]
"#]],
);
}
}
|
