From 05cdc87158ef99d1f59784372ce893596f8a5a80 Mon Sep 17 00:00:00 2001 From: Aleksey Kladov Date: Sun, 26 Apr 2020 10:54:08 +0200 Subject: Precompute expected type during completion --- .../src/completion/complete_unqualified_path.rs | 44 +++++++++++----------- crates/ra_ide/src/completion/completion_context.rs | 33 ++++++++++------ crates/ra_ide/src/completion/presentation.rs | 2 +- 3 files changed, 44 insertions(+), 35 deletions(-) (limited to 'crates/ra_ide/src') diff --git a/crates/ra_ide/src/completion/complete_unqualified_path.rs b/crates/ra_ide/src/completion/complete_unqualified_path.rs index 56cd086c6..f559f2b97 100644 --- a/crates/ra_ide/src/completion/complete_unqualified_path.rs +++ b/crates/ra_ide/src/completion/complete_unqualified_path.rs @@ -4,7 +4,7 @@ use hir::ScopeDef; use test_utils::tested_by; use crate::completion::{CompletionContext, Completions}; -use hir::{Adt, ModuleDef}; +use hir::{Adt, ModuleDef, Type}; use ra_syntax::AstNode; pub(super) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionContext) { @@ -15,7 +15,9 @@ pub(super) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC return; } - complete_enum_variants(acc, ctx); + if let Some(ty) = &ctx.expected_type { + complete_enum_variants(acc, ctx, ty); + } if ctx.is_pat_binding_or_const { return; @@ -34,26 +36,24 @@ pub(super) fn complete_unqualified_path(acc: &mut Completions, ctx: &CompletionC }); } -fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext) { - if let Some(ty) = ctx.expected_type_of(&ctx.token.parent()) { - if let Some(Adt::Enum(enum_data)) = ty.as_adt() { - let variants = enum_data.variants(ctx.db); - - let module = if let Some(module) = ctx.scope().module() { - // Compute path from the completion site if available. - module - } else { - // Otherwise fall back to the enum's definition site. - enum_data.module(ctx.db) - }; - - for variant in variants { - if let Some(path) = module.find_use_path(ctx.db, ModuleDef::from(variant)) { - // Variants with trivial paths are already added by the existing completion logic, - // so we should avoid adding these twice - if path.segments.len() > 1 { - acc.add_enum_variant(ctx, variant, Some(path.to_string())); - } +fn complete_enum_variants(acc: &mut Completions, ctx: &CompletionContext, ty: &Type) { + if let Some(Adt::Enum(enum_data)) = ty.as_adt() { + let variants = enum_data.variants(ctx.db); + + let module = if let Some(module) = ctx.scope().module() { + // Compute path from the completion site if available. + module + } else { + // Otherwise fall back to the enum's definition site. + enum_data.module(ctx.db) + }; + + for variant in variants { + if let Some(path) = module.find_use_path(ctx.db, ModuleDef::from(variant)) { + // Variants with trivial paths are already added by the existing completion logic, + // so we should avoid adding these twice + if path.segments.len() > 1 { + acc.add_enum_variant(ctx, variant, Some(path.to_string())); } } } diff --git a/crates/ra_ide/src/completion/completion_context.rs b/crates/ra_ide/src/completion/completion_context.rs index 5f2797e41..118fceb2e 100644 --- a/crates/ra_ide/src/completion/completion_context.rs +++ b/crates/ra_ide/src/completion/completion_context.rs @@ -5,7 +5,7 @@ use ra_db::SourceDatabase; use ra_ide_db::RootDatabase; use ra_syntax::{ algo::{find_covering_element, find_node_at_offset}, - ast, AstNode, + ast, match_ast, AstNode, SyntaxKind::*, SyntaxNode, SyntaxToken, TextRange, TextSize, }; @@ -26,6 +26,7 @@ pub(crate) struct CompletionContext<'a> { /// The token before the cursor, in the macro-expanded file. pub(super) token: SyntaxToken, pub(super) krate: Option, + pub(super) expected_type: Option, pub(super) name_ref_syntax: Option, pub(super) function_syntax: Option, pub(super) use_item_syntax: Option, @@ -93,6 +94,7 @@ impl<'a> CompletionContext<'a> { token, offset: position.offset, krate, + expected_type: None, name_ref_syntax: None, function_syntax: None, use_item_syntax: None, @@ -175,23 +177,30 @@ impl<'a> CompletionContext<'a> { self.sema.scope_at_offset(&self.token.parent(), self.offset) } - pub(crate) fn expected_type_of(&self, node: &SyntaxNode) -> Option { - for ancestor in node.ancestors() { - if let Some(pat) = ast::Pat::cast(ancestor.clone()) { - return self.sema.type_of_pat(&pat); - } else if let Some(expr) = ast::Expr::cast(ancestor) { - return self.sema.type_of_expr(&expr); - } - } - None - } - fn fill( &mut self, original_file: &SyntaxNode, file_with_fake_ident: SyntaxNode, offset: TextSize, ) { + // FIXME: this is wrong in at least two cases: + // * when there's no token `foo(<|>)` + // * when there is a token, but it happens to have type of it's own + self.expected_type = self + .token + .ancestors() + .find_map(|node| { + let ty = match_ast! { + match node { + ast::Pat(it) => self.sema.type_of_pat(&it), + ast::Expr(it) => self.sema.type_of_expr(&it), + _ => return None, + } + }; + Some(ty) + }) + .flatten(); + // First, let's try to complete a reference to some declaration. if let Some(name_ref) = find_node_at_offset::(&file_with_fake_ident, offset) { // Special case, `trait T { fn foo(i_am_a_name_ref) {} }`. diff --git a/crates/ra_ide/src/completion/presentation.rs b/crates/ra_ide/src/completion/presentation.rs index f5b074461..77d354376 100644 --- a/crates/ra_ide/src/completion/presentation.rs +++ b/crates/ra_ide/src/completion/presentation.rs @@ -351,7 +351,7 @@ impl Builder { } // Don't add parentheses if the expected type is some function reference. - if let Some(ty) = ctx.expected_type_of(&ctx.token.parent()) { + if let Some(ty) = &ctx.expected_type { if ty.is_fn() { return self; } -- cgit v1.2.3