diff options
Diffstat (limited to 'src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs')
| -rw-r--r-- | src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs | 87 |
1 files changed, 58 insertions, 29 deletions
diff --git a/src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs b/src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs index cfa3a6baa..c85a11db6 100644 --- a/src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs +++ b/src/tools/rust-analyzer/crates/hir-def/src/path/lower.rs @@ -1,9 +1,12 @@ //! Transforms syntax into `Path` objects, ideally with accounting for hygiene -use crate::{intern::Interned, type_ref::ConstScalarOrPath}; +use std::iter; + +use crate::type_ref::ConstScalarOrPath; use either::Either; use hir_expand::name::{name, AsName}; +use intern::Interned; use syntax::ast::{self, AstNode, HasTypeBounds}; use super::AssociatedTypeBinding; @@ -44,8 +47,11 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx<'_>) -> Option<Path ) }) .map(Interned::new); + if let Some(_) = args { + generic_args.resize(segments.len(), None); + generic_args.push(args); + } segments.push(name); - generic_args.push(args) } Either::Right(crate_id) => { kind = PathKind::DollarCrate(crate_id); @@ -55,7 +61,6 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx<'_>) -> Option<Path } ast::PathSegmentKind::SelfTypeKw => { segments.push(name![Self]); - generic_args.push(None) } ast::PathSegmentKind::Type { type_ref, trait_ref } => { assert!(path.qualifier().is_none()); // this can only occur at the first segment @@ -76,18 +81,33 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx<'_>) -> Option<Path kind = mod_path.kind; segments.extend(mod_path.segments().iter().cloned().rev()); - generic_args.extend(Vec::from(path_generic_args).into_iter().rev()); + if let Some(path_generic_args) = path_generic_args { + generic_args.resize(segments.len() - num_segments, None); + generic_args.extend(Vec::from(path_generic_args).into_iter().rev()); + } else { + generic_args.resize(segments.len(), None); + } + + let self_type = GenericArg::Type(self_type); // Insert the type reference (T in the above example) as Self parameter for the trait - let last_segment = - generic_args.iter_mut().rev().nth(num_segments.saturating_sub(1))?; - let mut args_inner = match last_segment { - Some(it) => it.as_ref().clone(), - None => GenericArgs::empty(), - }; - args_inner.has_self_type = true; - args_inner.args.insert(0, GenericArg::Type(self_type)); - *last_segment = Some(Interned::new(args_inner)); + let last_segment = generic_args.get_mut(segments.len() - num_segments)?; + *last_segment = Some(Interned::new(match last_segment.take() { + Some(it) => GenericArgs { + args: iter::once(self_type) + .chain(it.args.iter().cloned()) + .collect(), + + has_self_type: true, + bindings: it.bindings.clone(), + desugared_from_fn: it.desugared_from_fn, + }, + None => GenericArgs { + args: Box::new([self_type]), + has_self_type: true, + ..GenericArgs::empty() + }, + })); } } } @@ -114,7 +134,10 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx<'_>) -> Option<Path }; } segments.reverse(); - generic_args.reverse(); + if !generic_args.is_empty() { + generic_args.resize(segments.len(), None); + generic_args.reverse(); + } if segments.is_empty() && kind == PathKind::Plain && type_anchor.is_none() { // plain empty paths don't exist, this means we got a single `self` segment as our path @@ -134,7 +157,11 @@ pub(super) fn lower_path(mut path: ast::Path, ctx: &LowerCtx<'_>) -> Option<Path } let mod_path = Interned::new(ModPath::from_segments(kind, segments)); - return Some(Path { type_anchor, mod_path, generic_args: generic_args.into() }); + return Some(Path { + type_anchor, + mod_path, + generic_args: if generic_args.is_empty() { None } else { Some(generic_args.into()) }, + }); fn qualifier(path: &ast::Path) -> Option<ast::Path> { if let Some(q) = path.qualifier() { @@ -173,7 +200,7 @@ pub(super) fn lower_generic_args( .map(|it| Interned::new(TypeBound::from_ast(lower_ctx, it))) .collect() } else { - Vec::new() + Box::default() }; bindings.push(AssociatedTypeBinding { name, args, type_ref, bounds }); } @@ -194,7 +221,12 @@ pub(super) fn lower_generic_args( if args.is_empty() && bindings.is_empty() { return None; } - Some(GenericArgs { args, has_self_type: false, bindings, desugared_from_fn: false }) + Some(GenericArgs { + args: args.into_boxed_slice(), + has_self_type: false, + bindings: bindings.into_boxed_slice(), + desugared_from_fn: false, + }) } /// Collect `GenericArgs` from the parts of a fn-like path, i.e. `Fn(X, Y) @@ -204,33 +236,30 @@ fn lower_generic_args_from_fn_path( params: Option<ast::ParamList>, ret_type: Option<ast::RetType>, ) -> Option<GenericArgs> { - let mut args = Vec::new(); - let mut bindings = Vec::new(); let params = params?; let mut param_types = Vec::new(); for param in params.params() { let type_ref = TypeRef::from_ast_opt(ctx, param.ty()); param_types.push(type_ref); } - let arg = GenericArg::Type(TypeRef::Tuple(param_types)); - args.push(arg); - if let Some(ret_type) = ret_type { + let args = Box::new([GenericArg::Type(TypeRef::Tuple(param_types))]); + let bindings = if let Some(ret_type) = ret_type { let type_ref = TypeRef::from_ast_opt(ctx, ret_type.ty()); - bindings.push(AssociatedTypeBinding { + Box::new([AssociatedTypeBinding { name: name![Output], args: None, type_ref: Some(type_ref), - bounds: Vec::new(), - }); + bounds: Box::default(), + }]) } else { // -> () let type_ref = TypeRef::Tuple(Vec::new()); - bindings.push(AssociatedTypeBinding { + Box::new([AssociatedTypeBinding { name: name![Output], args: None, type_ref: Some(type_ref), - bounds: Vec::new(), - }); - } + bounds: Box::default(), + }]) + }; Some(GenericArgs { args, has_self_type: false, bindings, desugared_from_fn: true }) } |