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|
use crate::{db::RootDatabase, FileId};
use hir::{HirDisplay, Ty};
use ra_syntax::ast::Pat;
use ra_syntax::{
algo::visit::{visitor, Visitor},
ast::{self, PatKind, TypeAscriptionOwner},
AstNode, SmolStr, SourceFile, SyntaxNode, TextRange,
};
#[derive(Debug, PartialEq, Eq)]
pub enum InlayKind {
LetBindingType,
ClosureParameterType,
}
#[derive(Debug)]
pub struct InlayHint {
pub range: TextRange,
pub kind: InlayKind,
pub label: SmolStr,
}
pub(crate) fn inlay_hints(db: &RootDatabase, file_id: FileId, file: &SourceFile) -> Vec<InlayHint> {
file.syntax()
.descendants()
.map(|node| get_inlay_hints(db, file_id, &node).unwrap_or_default())
.flatten()
.collect()
}
fn get_inlay_hints(
db: &RootDatabase,
file_id: FileId,
node: &SyntaxNode,
) -> Option<Vec<InlayHint>> {
visitor()
.visit(|let_statement: ast::LetStmt| {
let let_syntax = let_statement.syntax();
if let_statement.ascribed_type().is_some() {
return None;
}
let let_pat = let_statement.pat()?;
let inlay_type_string = get_node_displayable_type(db, file_id, let_syntax, &let_pat)?
.display(db)
.to_string()
.into();
let pat_range = match let_pat.kind() {
PatKind::BindPat(bind_pat) => bind_pat.syntax().text_range(),
PatKind::TuplePat(tuple_pat) => tuple_pat.syntax().text_range(),
_ => return None,
};
Some(vec![InlayHint {
range: pat_range,
kind: InlayKind::LetBindingType,
label: inlay_type_string,
}])
})
.visit(|closure_parameter: ast::LambdaExpr| match closure_parameter.param_list() {
Some(param_list) => Some(
param_list
.params()
.filter(|closure_param| closure_param.ascribed_type().is_none())
.filter_map(|closure_param| {
let closure_param_syntax = closure_param.syntax();
let inlay_type_string = get_node_displayable_type(
db,
file_id,
closure_param_syntax,
&closure_param.pat()?,
)?
.display(db)
.to_string()
.into();
Some(InlayHint {
range: closure_param_syntax.text_range(),
kind: InlayKind::ClosureParameterType,
label: inlay_type_string,
})
})
.collect(),
),
None => None,
})
.accept(&node)?
}
fn get_node_displayable_type(
db: &RootDatabase,
file_id: FileId,
node_syntax: &SyntaxNode,
node_pat: &Pat,
) -> Option<Ty> {
let analyzer = hir::SourceAnalyzer::new(db, file_id, node_syntax, None);
analyzer.type_of_pat(db, node_pat).and_then(|resolved_type| {
if let Ty::Apply(_) = resolved_type {
Some(resolved_type)
} else {
None
}
})
}
#[cfg(test)]
mod tests {
use crate::mock_analysis::single_file;
use insta::assert_debug_snapshot_matches;
#[test]
fn test_inlay_hints() {
let (analysis, file_id) = single_file(
r#"
struct OuterStruct {}
fn main() {
struct InnerStruct {}
let test = 54;
let test = InnerStruct {};
let test = OuterStruct {};
let test = vec![222];
let mut test = Vec::new();
test.push(333);
let test = test.into_iter().map(|i| i * i).collect::<Vec<_>>();
let mut test = 33;
let _ = 22;
let test: Vec<_> = (0..3).collect();
let _ = (0..23).map(|i: u32| {
let i_squared = i * i;
i_squared
});
let test: i32 = 33;
let (x, c) = (42, 'a');
let test = (42, 'a');
}
"#,
);
assert_debug_snapshot_matches!(analysis.inlay_hints(file_id).unwrap(), @r#"[
InlayHint {
range: [71; 75),
kind: LetBindingType,
label: "i32",
},
InlayHint {
range: [121; 125),
kind: LetBindingType,
label: "OuterStruct",
},
InlayHint {
range: [297; 305),
kind: LetBindingType,
label: "i32",
},
InlayHint {
range: [417; 426),
kind: LetBindingType,
label: "u32",
},
InlayHint {
range: [496; 502),
kind: LetBindingType,
label: "(i32, char)",
},
InlayHint {
range: [524; 528),
kind: LetBindingType,
label: "(i32, char)",
},
]"#
);
}
}
|
