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|
use ra_db::{Cancelable, SyntaxDatabase};
use ra_syntax::{ast, AstNode};
use crate::{db::RootDatabase, RangeInfo, FilePosition, FileRange};
pub(crate) fn hover(
db: &RootDatabase,
position: FilePosition,
) -> Cancelable<Option<RangeInfo<String>>> {
let mut res = Vec::new();
let range = if let Some(rr) = db.approximately_resolve_symbol(position)? {
for nav in rr.resolves_to {
res.extend(db.doc_text_for(nav)?)
}
rr.reference_range
} else {
let file = db.source_file(position.file_id);
let expr: ast::Expr = ctry!(ra_editor::find_node_at_offset(
file.syntax(),
position.offset
));
let frange = FileRange {
file_id: position.file_id,
range: expr.syntax().range(),
};
res.extend(db.type_of(frange)?);
expr.syntax().range()
};
if res.is_empty() {
return Ok(None);
}
let res = RangeInfo::new(range, res.join("\n\n---\n"));
Ok(Some(res))
}
#[cfg(test)]
mod tests {
use ra_syntax::TextRange;
use crate::mock_analysis::single_file_with_position;
#[test]
fn hover_shows_type_of_an_expression() {
let (analysis, position) = single_file_with_position(
"
pub fn foo() -> u32 { 1 }
fn main() {
let foo_test = foo()<|>;
}
",
);
let hover = analysis.hover(position).unwrap().unwrap();
assert_eq!(hover.range, TextRange::from_to(95.into(), 100.into()));
assert_eq!(hover.info, "u32");
}
}
|
