diff options
Diffstat (limited to 'src/tools/rust-analyzer/crates/ide/src/signature_help.rs')
| -rw-r--r-- | src/tools/rust-analyzer/crates/ide/src/signature_help.rs | 299 |
1 files changed, 231 insertions, 68 deletions
diff --git a/src/tools/rust-analyzer/crates/ide/src/signature_help.rs b/src/tools/rust-analyzer/crates/ide/src/signature_help.rs index f807ba30f..f70ca55a5 100644 --- a/src/tools/rust-analyzer/crates/ide/src/signature_help.rs +++ b/src/tools/rust-analyzer/crates/ide/src/signature_help.rs @@ -4,8 +4,14 @@ use std::collections::BTreeSet; use either::Either; -use hir::{AssocItem, GenericParam, HasAttrs, HirDisplay, Semantics, Trait}; -use ide_db::{active_parameter::callable_for_node, base_db::FilePosition}; +use hir::{ + AssocItem, GenericParam, HasAttrs, HirDisplay, ModuleDef, PathResolution, Semantics, Trait, +}; +use ide_db::{ + active_parameter::{callable_for_node, generic_def_for_node}, + base_db::FilePosition, + FxIndexMap, +}; use stdx::format_to; use syntax::{ algo, @@ -37,14 +43,18 @@ impl SignatureHelp { } fn push_call_param(&mut self, param: &str) { - self.push_param('(', param); + self.push_param("(", param); } fn push_generic_param(&mut self, param: &str) { - self.push_param('<', param); + self.push_param("<", param); } - fn push_param(&mut self, opening_delim: char, param: &str) { + fn push_record_field(&mut self, param: &str) { + self.push_param("{ ", param); + } + + fn push_param(&mut self, opening_delim: &str, param: &str) { if !self.signature.ends_with(opening_delim) { self.signature.push_str(", "); } @@ -85,6 +95,13 @@ pub(crate) fn signature_help(db: &RootDatabase, position: FilePosition) -> Optio } return signature_help_for_generics(&sema, garg_list, token); }, + ast::RecordExpr(record) => { + let cursor_outside = record.record_expr_field_list().and_then(|list| list.r_curly_token()).as_ref() == Some(&token); + if cursor_outside { + continue; + } + return signature_help_for_record_lit(&sema, record, token); + }, _ => (), } } @@ -92,8 +109,10 @@ pub(crate) fn signature_help(db: &RootDatabase, position: FilePosition) -> Optio // Stop at multi-line expressions, since the signature of the outer call is not very // helpful inside them. if let Some(expr) = ast::Expr::cast(node.clone()) { - if expr.syntax().text().contains_char('\n') { - return None; + if !matches!(expr, ast::Expr::RecordExpr(..)) + && expr.syntax().text().contains_char('\n') + { + break; } } } @@ -107,18 +126,16 @@ fn signature_help_for_call( token: SyntaxToken, ) -> Option<SignatureHelp> { // Find the calling expression and its NameRef - let mut node = arg_list.syntax().parent()?; + let mut nodes = arg_list.syntax().ancestors().skip(1); let calling_node = loop { - if let Some(callable) = ast::CallableExpr::cast(node.clone()) { - if callable + if let Some(callable) = ast::CallableExpr::cast(nodes.next()?) { + let inside_callable = callable .arg_list() - .map_or(false, |it| it.syntax().text_range().contains(token.text_range().start())) - { + .map_or(false, |it| it.syntax().text_range().contains(token.text_range().start())); + if inside_callable { break callable; } } - - node = node.parent()?; }; let (callable, active_parameter) = callable_for_node(sema, &calling_node, &token)?; @@ -201,59 +218,11 @@ fn signature_help_for_call( fn signature_help_for_generics( sema: &Semantics<'_, RootDatabase>, - garg_list: ast::GenericArgList, + arg_list: ast::GenericArgList, token: SyntaxToken, ) -> Option<SignatureHelp> { - let arg_list = garg_list - .syntax() - .ancestors() - .filter_map(ast::GenericArgList::cast) - .find(|list| list.syntax().text_range().contains(token.text_range().start()))?; - - let mut active_parameter = arg_list - .generic_args() - .take_while(|arg| arg.syntax().text_range().end() <= token.text_range().start()) - .count(); - - let first_arg_is_non_lifetime = arg_list - .generic_args() - .next() - .map_or(false, |arg| !matches!(arg, ast::GenericArg::LifetimeArg(_))); - - let mut generics_def = if let Some(path) = - arg_list.syntax().ancestors().find_map(ast::Path::cast) - { - let res = sema.resolve_path(&path)?; - let generic_def: hir::GenericDef = match res { - hir::PathResolution::Def(hir::ModuleDef::Adt(it)) => it.into(), - hir::PathResolution::Def(hir::ModuleDef::Function(it)) => it.into(), - hir::PathResolution::Def(hir::ModuleDef::Trait(it)) => it.into(), - hir::PathResolution::Def(hir::ModuleDef::TypeAlias(it)) => it.into(), - hir::PathResolution::Def(hir::ModuleDef::Variant(it)) => it.into(), - hir::PathResolution::Def(hir::ModuleDef::BuiltinType(_)) - | hir::PathResolution::Def(hir::ModuleDef::Const(_)) - | hir::PathResolution::Def(hir::ModuleDef::Macro(_)) - | hir::PathResolution::Def(hir::ModuleDef::Module(_)) - | hir::PathResolution::Def(hir::ModuleDef::Static(_)) => return None, - hir::PathResolution::BuiltinAttr(_) - | hir::PathResolution::ToolModule(_) - | hir::PathResolution::Local(_) - | hir::PathResolution::TypeParam(_) - | hir::PathResolution::ConstParam(_) - | hir::PathResolution::SelfType(_) - | hir::PathResolution::DeriveHelper(_) => return None, - }; - - generic_def - } else if let Some(method_call) = arg_list.syntax().parent().and_then(ast::MethodCallExpr::cast) - { - // recv.method::<$0>() - let method = sema.resolve_method_call(&method_call)?; - method.into() - } else { - return None; - }; - + let (mut generics_def, mut active_parameter, first_arg_is_non_lifetime) = + generic_def_for_node(sema, &arg_list, &token)?; let mut res = SignatureHelp { doc: None, signature: String::new(), @@ -292,9 +261,9 @@ fn signature_help_for_generics( // eg. `None::<u8>` // We'll use the signature of the enum, but include the docs of the variant. res.doc = it.docs(db).map(|it| it.into()); - let it = it.parent_enum(db); - format_to!(res.signature, "enum {}", it.name(db)); - generics_def = it.into(); + let enum_ = it.parent_enum(db); + format_to!(res.signature, "enum {}", enum_.name(db)); + generics_def = enum_.into(); } // These don't have generic args that can be specified hir::GenericDef::Impl(_) | hir::GenericDef::Const(_) => return None, @@ -368,6 +337,83 @@ fn add_assoc_type_bindings( } } +fn signature_help_for_record_lit( + sema: &Semantics<'_, RootDatabase>, + record: ast::RecordExpr, + token: SyntaxToken, +) -> Option<SignatureHelp> { + let active_parameter = record + .record_expr_field_list()? + .syntax() + .children_with_tokens() + .filter_map(syntax::NodeOrToken::into_token) + .filter(|t| t.kind() == syntax::T![,]) + .take_while(|t| t.text_range().start() <= token.text_range().start()) + .count(); + + let mut res = SignatureHelp { + doc: None, + signature: String::new(), + parameters: vec![], + active_parameter: Some(active_parameter), + }; + + let fields; + + let db = sema.db; + let path_res = sema.resolve_path(&record.path()?)?; + if let PathResolution::Def(ModuleDef::Variant(variant)) = path_res { + fields = variant.fields(db); + let en = variant.parent_enum(db); + + res.doc = en.docs(db).map(|it| it.into()); + format_to!(res.signature, "enum {}::{} {{ ", en.name(db), variant.name(db)); + } else { + let adt = match path_res { + PathResolution::SelfType(imp) => imp.self_ty(db).as_adt()?, + PathResolution::Def(ModuleDef::Adt(adt)) => adt, + _ => return None, + }; + + match adt { + hir::Adt::Struct(it) => { + fields = it.fields(db); + res.doc = it.docs(db).map(|it| it.into()); + format_to!(res.signature, "struct {} {{ ", it.name(db)); + } + hir::Adt::Union(it) => { + fields = it.fields(db); + res.doc = it.docs(db).map(|it| it.into()); + format_to!(res.signature, "union {} {{ ", it.name(db)); + } + _ => return None, + } + } + + let mut fields = + fields.into_iter().map(|field| (field.name(db), Some(field))).collect::<FxIndexMap<_, _>>(); + let mut buf = String::new(); + for field in record.record_expr_field_list()?.fields() { + let Some((field, _, ty)) = sema.resolve_record_field(&field) else { continue }; + let name = field.name(db); + format_to!(buf, "{name}: {}", ty.display_truncated(db, Some(20))); + res.push_record_field(&buf); + buf.clear(); + + if let Some(field) = fields.get_mut(&name) { + *field = None; + } + } + for (name, field) in fields { + let Some(field) = field else { continue }; + format_to!(buf, "{name}: {}", field.ty(db).display_truncated(db, Some(20))); + res.push_record_field(&buf); + buf.clear(); + } + res.signature.push_str(" }"); + Some(res) +} + #[cfg(test)] mod tests { use std::iter; @@ -1405,4 +1451,121 @@ fn take<C, Error>( "#]], ); } + + #[test] + fn record_literal() { + check( + r#" +struct Strukt<T, U = ()> { + t: T, + u: U, + unit: (), +} +fn f() { + Strukt { + u: 0, + $0 + } +} +"#, + expect![[r#" + struct Strukt { u: i32, t: T, unit: () } + ------ ^^^^ -------- + "#]], + ); + } + + #[test] + fn record_literal_nonexistent_field() { + check( + r#" +struct Strukt { + a: u8, +} +fn f() { + Strukt { + b: 8, + $0 + } +} +"#, + expect![[r#" + struct Strukt { a: u8 } + ----- + "#]], + ); + } + + #[test] + fn tuple_variant_record_literal() { + check( + r#" +enum Opt { + Some(u8), +} +fn f() { + Opt::Some {$0} +} +"#, + expect![[r#" + enum Opt::Some { 0: u8 } + ^^^^^ + "#]], + ); + check( + r#" +enum Opt { + Some(u8), +} +fn f() { + Opt::Some {0:0,$0} +} +"#, + expect![[r#" + enum Opt::Some { 0: u8 } + ----- + "#]], + ); + } + + #[test] + fn record_literal_self() { + check( + r#" +struct S { t: u8 } +impl S { + fn new() -> Self { + Self { $0 } + } +} + "#, + expect![[r#" + struct S { t: u8 } + ^^^^^ + "#]], + ); + } + + #[test] + fn test_enum_in_nested_method_in_lambda() { + check( + r#" +enum A { + A, + B +} + +fn bar(_: A) { } + +fn main() { + let foo = Foo; + std::thread::spawn(move || { bar(A:$0) } ); +} +"#, + expect![[r#" + fn bar(_: A) + ^^^^ + "#]], + ); + } } |