1 files changed, 71 insertions, 19 deletions

diff --git a/crates/ide_completion/src/context.rs b/crates/ide_completion/src/context.rs
index 6d57da06a..32f81aec1 100644
--- a/crates/ide_completion/src/context.rs
+++ b/crates/ide_completion/src/context.rs
@@ -4,8 +4,11 @@ use hir::{Local, ScopeDef, Semantics, SemanticsScope, Type};
 use ide_db::base_db::{FilePosition, SourceDatabase};
 use ide_db::{call_info::ActiveParameter, RootDatabase};
 use syntax::{
-    algo::find_node_at_offset, ast, match_ast, AstNode, NodeOrToken, SyntaxKind::*, SyntaxNode,
-    SyntaxToken, TextRange, TextSize,
+    algo::find_node_at_offset,
+    ast::{self, NameOrNameRef, NameOwner},
+    match_ast, AstNode, NodeOrToken,
+    SyntaxKind::*,
+    SyntaxNode, SyntaxToken, TextRange, TextSize,
 };
 
 use text_edit::Indel;
@@ -35,18 +38,22 @@ pub(crate) struct CompletionContext<'a> {
     /// The token before the cursor, in the macro-expanded file.
     pub(super) token: SyntaxToken,
     pub(super) krate: Option<hir::Crate>,
-    pub(super) expected_name: Option<String>,
+    pub(super) expected_name: Option<NameOrNameRef>,
     pub(super) expected_type: Option<Type>,
     pub(super) name_ref_syntax: Option<ast::NameRef>,
+    pub(super) lifetime_syntax: Option<ast::Lifetime>,
+    pub(super) lifetime_param_syntax: Option<ast::LifetimeParam>,
     pub(super) function_syntax: Option<ast::Fn>,
     pub(super) use_item_syntax: Option<ast::Use>,
     pub(super) record_lit_syntax: Option<ast::RecordExpr>,
     pub(super) record_pat_syntax: Option<ast::RecordPat>,
     pub(super) record_field_syntax: Option<ast::RecordExprField>,
     pub(super) impl_def: Option<ast::Impl>,
+    pub(super) lifetime_allowed: bool,
     /// FIXME: `ActiveParameter` is string-based, which is very very wrong
     pub(super) active_parameter: Option<ActiveParameter>,
     pub(super) is_param: bool,
+    pub(super) is_label_ref: bool,
     /// If a name-binding or reference to a const in a pattern.
     /// Irrefutable patterns (like let) are excluded.
     pub(super) is_pat_binding_or_const: bool,
@@ -136,9 +143,12 @@ impl<'a> CompletionContext<'a> {
             original_token,
             token,
             krate,
+            lifetime_allowed: false,
             expected_name: None,
             expected_type: None,
             name_ref_syntax: None,
+            lifetime_syntax: None,
+            lifetime_param_syntax: None,
             function_syntax: None,
             use_item_syntax: None,
             record_lit_syntax: None,
@@ -146,6 +156,7 @@ impl<'a> CompletionContext<'a> {
             record_field_syntax: None,
             impl_def: None,
             active_parameter: ActiveParameter::at(db, position),
+            is_label_ref: false,
             is_param: false,
             is_pat_binding_or_const: false,
             is_irrefutable_pat_binding: false,
@@ -241,9 +252,13 @@ impl<'a> CompletionContext<'a> {
     pub(crate) fn source_range(&self) -> TextRange {
         // check kind of macro-expanded token, but use range of original token
         let kind = self.token.kind();
-        if kind == IDENT || kind == UNDERSCORE || kind.is_keyword() {
+        if kind == IDENT || kind == LIFETIME_IDENT || kind == UNDERSCORE || kind.is_keyword() {
             cov_mark::hit!(completes_if_prefix_is_keyword);
             self.original_token.text_range()
+        } else if kind == CHAR {
+            // assume we are completing a lifetime but the user has only typed the '
+            cov_mark::hit!(completes_if_lifetime_without_idents);
+            TextRange::at(self.original_token.text_range().start(), TextSize::from(1))
         } else {
             TextRange::empty(self.position.offset)
         }
@@ -292,13 +307,13 @@ impl<'a> CompletionContext<'a> {
         file_with_fake_ident: SyntaxNode,
         offset: TextSize,
     ) {
-        let expected = {
+        let (expected_type, expected_name) = {
             let mut node = match self.token.parent() {
                 Some(it) => it,
                 None => return,
             };
             loop {
-                let ret = match_ast! {
+                break match_ast! {
                     match node {
                         ast::LetStmt(it) => {
                             cov_mark::hit!(expected_type_let_with_leading_char);
@@ -306,7 +321,7 @@ impl<'a> CompletionContext<'a> {
                             let ty = it.pat()
                                 .and_then(|pat| self.sema.type_of_pat(&pat));
                             let name = if let Some(ast::Pat::IdentPat(ident)) = it.pat() {
-                                Some(ident.syntax().text().to_string())
+                                ident.name().map(NameOrNameRef::Name)
                             } else {
                                 None
                             };
@@ -319,7 +334,10 @@ impl<'a> CompletionContext<'a> {
                             ActiveParameter::at_token(
                                 &self.sema,
                                 self.token.clone(),
-                            ).map(|ap| (Some(ap.ty), Some(ap.name)))
+                            ).map(|ap| {
+                                let name = ap.ident().map(NameOrNameRef::Name);
+                                (Some(ap.ty), name)
+                            })
                             .unwrap_or((None, None))
                         },
                         ast::RecordExprFieldList(_it) => {
@@ -327,10 +345,10 @@ impl<'a> CompletionContext<'a> {
                             self.token.prev_sibling_or_token()
                                 .and_then(|se| se.into_node())
                                 .and_then(|node| ast::RecordExprField::cast(node))
-                                .and_then(|rf| self.sema.resolve_record_field(&rf))
-                                .map(|f|(
+                                .and_then(|rf| self.sema.resolve_record_field(&rf).zip(Some(rf)))
+                                .map(|(f, rf)|(
                                     Some(f.0.signature_ty(self.db)),
-                                    Some(f.0.name(self.db).to_string()),
+                                    rf.field_name().map(NameOrNameRef::NameRef),
                                 ))
                                 .unwrap_or((None, None))
                         },
@@ -340,7 +358,7 @@ impl<'a> CompletionContext<'a> {
                                 .resolve_record_field(&it)
                                 .map(|f|(
                                     Some(f.0.signature_ty(self.db)),
-                                    Some(f.0.name(self.db).to_string()),
+                                    it.field_name().map(NameOrNameRef::NameRef),
                                 ))
                                 .unwrap_or((None, None))
                         },
@@ -378,14 +396,17 @@ impl<'a> CompletionContext<'a> {
                         },
                     }
                 };
-
-                break ret;
             }
         };
-        self.expected_type = expected.0;
-        self.expected_name = expected.1;
+        self.expected_type = expected_type;
+        self.expected_name = expected_name;
         self.attribute_under_caret = find_node_at_offset(&file_with_fake_ident, offset);
 
+        if let Some(lifetime) = find_node_at_offset::<ast::Lifetime>(&file_with_fake_ident, offset)
+        {
+            self.classify_lifetime(original_file, lifetime, offset);
+        }
+
         // First, let's try to complete a reference to some declaration.
         if let Some(name_ref) = find_node_at_offset::<ast::NameRef>(&file_with_fake_ident, offset) {
             // Special case, `trait T { fn foo(i_am_a_name_ref) {} }`.
@@ -445,6 +466,35 @@ impl<'a> CompletionContext<'a> {
         }
     }
 
+    fn classify_lifetime(
+        &mut self,
+        original_file: &SyntaxNode,
+        lifetime: ast::Lifetime,
+        offset: TextSize,
+    ) {
+        self.lifetime_syntax =
+            find_node_at_offset(original_file, lifetime.syntax().text_range().start());
+        if let Some(parent) = lifetime.syntax().parent() {
+            if parent.kind() == ERROR {
+                return;
+            }
+
+            match_ast! {
+                match parent {
+                    ast::LifetimeParam(_it) => {
+                        self.lifetime_allowed = true;
+                        self.lifetime_param_syntax =
+                            self.sema.find_node_at_offset_with_macros(original_file, offset);
+                    },
+                    ast::BreakExpr(_it) => self.is_label_ref = true,
+                    ast::ContinueExpr(_it) => self.is_label_ref = true,
+                    ast::Label(_it) => (),
+                    _ => self.lifetime_allowed = true,
+                }
+            }
+        }
+    }
+
     fn classify_name_ref(
         &mut self,
         original_file: &SyntaxNode,
@@ -452,11 +502,11 @@ impl<'a> CompletionContext<'a> {
         offset: TextSize,
     ) {
         self.name_ref_syntax =
-            find_node_at_offset(&original_file, name_ref.syntax().text_range().start());
+            find_node_at_offset(original_file, name_ref.syntax().text_range().start());
         let name_range = name_ref.syntax().text_range();
         if ast::RecordExprField::for_field_name(&name_ref).is_some() {
             self.record_lit_syntax =
-                self.sema.find_node_at_offset_with_macros(&original_file, offset);
+                self.sema.find_node_at_offset_with_macros(original_file, offset);
         }
 
         self.fill_impl_def();
@@ -631,7 +681,9 @@ mod tests {
             .map(|t| t.display_test(&db).to_string())
             .unwrap_or("?".to_owned());
 
-        let name = completion_context.expected_name.unwrap_or("?".to_owned());
+        let name = completion_context
+            .expected_name
+            .map_or_else(|| "?".to_owned(), |name| name.to_string());
 
         expect.assert_eq(&format!("ty: {}, name: {}", ty, name));
     }