From 8e08b86304f8cf91e06f64855c8de306ad7efaa4 Mon Sep 17 00:00:00 2001 From: rdambrosio Date: Thu, 17 Jun 2021 19:54:28 -0400 Subject: Feat: inline generics in const and func trait completions --- crates/ide_assists/src/lib.rs | 1 - crates/ide_assists/src/path_transform.rs | 160 ------------------------------- crates/ide_assists/src/utils.rs | 6 +- 3 files changed, 2 insertions(+), 165 deletions(-) delete mode 100644 crates/ide_assists/src/path_transform.rs (limited to 'crates/ide_assists/src') diff --git a/crates/ide_assists/src/lib.rs b/crates/ide_assists/src/lib.rs index fa378a622..86a57ce5d 100644 --- a/crates/ide_assists/src/lib.rs +++ b/crates/ide_assists/src/lib.rs @@ -15,7 +15,6 @@ mod assist_context; #[cfg(test)] mod tests; pub mod utils; -pub mod path_transform; use hir::Semantics; use ide_db::{base_db::FileRange, RootDatabase}; diff --git a/crates/ide_assists/src/path_transform.rs b/crates/ide_assists/src/path_transform.rs deleted file mode 100644 index 48a7fa06a..000000000 --- a/crates/ide_assists/src/path_transform.rs +++ /dev/null @@ -1,160 +0,0 @@ -//! See [`PathTransform`]. - -use hir::{HirDisplay, SemanticsScope}; -use ide_db::helpers::mod_path_to_ast; -use rustc_hash::FxHashMap; -use syntax::{ - ast::{self, AstNode}, - ted, -}; - -/// `PathTransform` substitutes path in SyntaxNodes in bulk. -/// -/// This is mostly useful for IDE code generation. If you paste some existing -/// code into a new context (for example, to add method overrides to an `impl` -/// block), you generally want to appropriately qualify the names, and sometimes -/// you might want to substitute generic parameters as well: -/// -/// ``` -/// mod x { -/// pub struct A; -/// pub trait T { fn foo(&self, _: U) -> A; } -/// } -/// -/// mod y { -/// use x::T; -/// -/// impl T<()> for () { -/// // If we invoke **Add Missing Members** here, we want to copy-paste `foo`. -/// // But we want a slightly-modified version of it: -/// fn foo(&self, _: ()) -> x::A<()> {} -/// } -/// } -/// ``` -pub(crate) struct PathTransform<'a> { - pub(crate) subst: (hir::Trait, ast::Impl), - pub(crate) target_scope: &'a SemanticsScope<'a>, - pub(crate) source_scope: &'a SemanticsScope<'a>, -} - -impl<'a> PathTransform<'a> { - pub(crate) fn apply(&self, item: ast::AssocItem) { - if let Some(ctx) = self.build_ctx() { - ctx.apply(item) - } - } - fn build_ctx(&self) -> Option> { - let db = self.source_scope.db; - let target_module = self.target_scope.module()?; - let source_module = self.source_scope.module()?; - - let substs = get_syntactic_substs(self.subst.1.clone()).unwrap_or_default(); - let generic_def: hir::GenericDef = self.subst.0.into(); - let substs_by_param: FxHashMap<_, _> = generic_def - .type_params(db) - .into_iter() - // this is a trait impl, so we need to skip the first type parameter -- this is a bit hacky - .skip(1) - // The actual list of trait type parameters may be longer than the one - // used in the `impl` block due to trailing default type parameters. - // For that case we extend the `substs` with an empty iterator so we - // can still hit those trailing values and check if they actually have - // a default type. If they do, go for that type from `hir` to `ast` so - // the resulting change can be applied correctly. - .zip(substs.into_iter().map(Some).chain(std::iter::repeat(None))) - .filter_map(|(k, v)| match v { - Some(v) => Some((k, v)), - None => { - let default = k.default(db)?; - Some(( - k, - ast::make::ty(&default.display_source_code(db, source_module.into()).ok()?), - )) - } - }) - .collect(); - - let res = Ctx { substs: substs_by_param, target_module, source_scope: self.source_scope }; - Some(res) - } -} - -struct Ctx<'a> { - substs: FxHashMap, - target_module: hir::Module, - source_scope: &'a SemanticsScope<'a>, -} - -impl<'a> Ctx<'a> { - fn apply(&self, item: ast::AssocItem) { - for event in item.syntax().preorder() { - let node = match event { - syntax::WalkEvent::Enter(_) => continue, - syntax::WalkEvent::Leave(it) => it, - }; - if let Some(path) = ast::Path::cast(node.clone()) { - self.transform_path(path); - } - } - } - fn transform_path(&self, path: ast::Path) -> Option<()> { - if path.qualifier().is_some() { - return None; - } - if path.segment().and_then(|s| s.param_list()).is_some() { - // don't try to qualify `Fn(Foo) -> Bar` paths, they are in prelude anyway - return None; - } - - let resolution = self.source_scope.speculative_resolve(&path)?; - - match resolution { - hir::PathResolution::TypeParam(tp) => { - if let Some(subst) = self.substs.get(&tp) { - ted::replace(path.syntax(), subst.clone_subtree().clone_for_update().syntax()) - } - } - hir::PathResolution::Def(def) => { - let found_path = - self.target_module.find_use_path(self.source_scope.db.upcast(), def)?; - let res = mod_path_to_ast(&found_path).clone_for_update(); - if let Some(args) = path.segment().and_then(|it| it.generic_arg_list()) { - if let Some(segment) = res.segment() { - let old = segment.get_or_create_generic_arg_list(); - ted::replace(old.syntax(), args.clone_subtree().syntax().clone_for_update()) - } - } - ted::replace(path.syntax(), res.syntax()) - } - hir::PathResolution::Local(_) - | hir::PathResolution::ConstParam(_) - | hir::PathResolution::SelfType(_) - | hir::PathResolution::Macro(_) - | hir::PathResolution::AssocItem(_) => (), - } - Some(()) - } -} - -// FIXME: It would probably be nicer if we could get this via HIR (i.e. get the -// trait ref, and then go from the types in the substs back to the syntax). -fn get_syntactic_substs(impl_def: ast::Impl) -> Option> { - let target_trait = impl_def.trait_()?; - let path_type = match target_trait { - ast::Type::PathType(path) => path, - _ => return None, - }; - let generic_arg_list = path_type.path()?.segment()?.generic_arg_list()?; - - let mut result = Vec::new(); - for generic_arg in generic_arg_list.generic_args() { - match generic_arg { - ast::GenericArg::TypeArg(type_arg) => result.push(type_arg.ty()?), - ast::GenericArg::AssocTypeArg(_) - | ast::GenericArg::LifetimeArg(_) - | ast::GenericArg::ConstArg(_) => (), - } - } - - Some(result) -} diff --git a/crates/ide_assists/src/utils.rs b/crates/ide_assists/src/utils.rs index 068df005b..0ec236aa0 100644 --- a/crates/ide_assists/src/utils.rs +++ b/crates/ide_assists/src/utils.rs @@ -8,6 +8,7 @@ use ast::TypeBoundsOwner; use hir::{Adt, HasSource, Semantics}; use ide_db::{ helpers::{FamousDefs, SnippetCap}, + path_transform::PathTransform, RootDatabase, }; use itertools::Itertools; @@ -22,10 +23,7 @@ use syntax::{ SyntaxNode, TextSize, T, }; -use crate::{ - assist_context::{AssistBuilder, AssistContext}, - path_transform::PathTransform, -}; +use crate::assist_context::{AssistBuilder, AssistContext}; pub(crate) fn unwrap_trivial_block(block: ast::BlockExpr) -> ast::Expr { extract_trivial_expression(&block) -- cgit v1.2.3