From e4de2c8d7f5ced7a24d0a76213ab113218c99d30 Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Thu, 27 Dec 2018 17:33:52 +0300
Subject: add function to completion ctx

---
 crates/ra_analysis/src/completion/complete_dot.rs       | 17 +++--------------
 crates/ra_analysis/src/completion/complete_keyword.rs   |  2 +-
 crates/ra_analysis/src/completion/complete_scope.rs     |  3 +--
 crates/ra_analysis/src/completion/complete_snippet.rs   |  2 +-
 crates/ra_analysis/src/completion/completion_context.rs | 15 ++++++++++++---
 crates/ra_hir/src/function.rs                           |  1 +
 6 files changed, 19 insertions(+), 21 deletions(-)

diff --git a/crates/ra_analysis/src/completion/complete_dot.rs b/crates/ra_analysis/src/completion/complete_dot.rs
index 93d657576..f24835d17 100644
--- a/crates/ra_analysis/src/completion/complete_dot.rs
+++ b/crates/ra_analysis/src/completion/complete_dot.rs
@@ -6,20 +6,9 @@ use crate::completion::{CompletionContext, Completions, CompletionKind, Completi
 
 /// Complete dot accesses, i.e. fields or methods (currently only fields).
 pub(super) fn complete_dot(acc: &mut Completions, ctx: &CompletionContext) -> Cancelable<()> {
-    let module = if let Some(module) = &ctx.module {
-        module
-    } else {
-        return Ok(());
-    };
-    let function = if let Some(fn_def) = ctx.enclosing_fn {
-        hir::source_binder::function_from_module(ctx.db, module, fn_def)
-    } else {
-        return Ok(());
-    };
-    let receiver = if let Some(receiver) = ctx.dot_receiver {
-        receiver
-    } else {
-        return Ok(());
+    let (function, receiver) = match (&ctx.function, ctx.dot_receiver) {
+        (Some(function), Some(receiver)) => (function, receiver),
+        _ => return Ok(()),
     };
     let infer_result = function.infer(ctx.db)?;
     let receiver_ty = if let Some(ty) = infer_result.type_of_node(receiver.syntax()) {
diff --git a/crates/ra_analysis/src/completion/complete_keyword.rs b/crates/ra_analysis/src/completion/complete_keyword.rs
index 5427fcb11..d1e0a20a8 100644
--- a/crates/ra_analysis/src/completion/complete_keyword.rs
+++ b/crates/ra_analysis/src/completion/complete_keyword.rs
@@ -18,7 +18,7 @@ pub(super) fn complete_expr_keyword(acc: &mut Completions, ctx: &CompletionConte
     if !ctx.is_trivial_path {
         return;
     }
-    let fn_def = match ctx.enclosing_fn {
+    let fn_def = match ctx.function_syntax {
         Some(it) => it,
         None => return,
     };
diff --git a/crates/ra_analysis/src/completion/complete_scope.rs b/crates/ra_analysis/src/completion/complete_scope.rs
index a57670e3b..514fd2f88 100644
--- a/crates/ra_analysis/src/completion/complete_scope.rs
+++ b/crates/ra_analysis/src/completion/complete_scope.rs
@@ -14,8 +14,7 @@ pub(super) fn complete_scope(acc: &mut Completions, ctx: &CompletionContext) ->
         Some(it) => it,
         None => return Ok(()),
     };
-    if let Some(fn_def) = ctx.enclosing_fn {
-        let function = hir::source_binder::function_from_module(ctx.db, module, fn_def);
+    if let Some(function) = &ctx.function {
         let scopes = function.scopes(ctx.db);
         complete_fn(acc, &scopes, ctx.offset);
     }
diff --git a/crates/ra_analysis/src/completion/complete_snippet.rs b/crates/ra_analysis/src/completion/complete_snippet.rs
index fb9da0a4f..a495751dd 100644
--- a/crates/ra_analysis/src/completion/complete_snippet.rs
+++ b/crates/ra_analysis/src/completion/complete_snippet.rs
@@ -7,7 +7,7 @@ fn snippet(label: &str, snippet: &str) -> Builder {
 }
 
 pub(super) fn complete_expr_snippet(acc: &mut Completions, ctx: &CompletionContext) {
-    if !(ctx.is_trivial_path && ctx.enclosing_fn.is_some()) {
+    if !(ctx.is_trivial_path && ctx.function_syntax.is_some()) {
         return;
     }
     snippet("pd", "eprintln!(\"$0 = {:?}\", $0);").add_to(acc);
diff --git a/crates/ra_analysis/src/completion/completion_context.rs b/crates/ra_analysis/src/completion/completion_context.rs
index 978772fd4..71bf7fd32 100644
--- a/crates/ra_analysis/src/completion/completion_context.rs
+++ b/crates/ra_analysis/src/completion/completion_context.rs
@@ -22,7 +22,8 @@ pub(super) struct CompletionContext<'a> {
     pub(super) offset: TextUnit,
     pub(super) leaf: SyntaxNodeRef<'a>,
     pub(super) module: Option<hir::Module>,
-    pub(super) enclosing_fn: Option<ast::FnDef<'a>>,
+    pub(super) function: Option<hir::Function>,
+    pub(super) function_syntax: Option<ast::FnDef<'a>>,
     pub(super) is_param: bool,
     /// A single-indent path, like `foo`.
     pub(super) is_trivial_path: bool,
@@ -52,7 +53,8 @@ impl<'a> CompletionContext<'a> {
             leaf,
             offset: position.offset,
             module,
-            enclosing_fn: None,
+            function: None,
+            function_syntax: None,
             is_param: false,
             is_trivial_path: false,
             path_prefix: None,
@@ -112,11 +114,18 @@ impl<'a> CompletionContext<'a> {
             _ => (),
         }
 
-        self.enclosing_fn = self
+        self.function_syntax = self
             .leaf
             .ancestors()
             .take_while(|it| it.kind() != SOURCE_FILE && it.kind() != MODULE)
             .find_map(ast::FnDef::cast);
+        match (&self.module, self.function_syntax) {
+            (Some(module), Some(fn_def)) => {
+                let function = source_binder::function_from_module(self.db, module, fn_def);
+                self.function = Some(function);
+            }
+            _ => (),
+        }
 
         let parent = match name_ref.syntax().parent() {
             Some(it) => it,
diff --git a/crates/ra_hir/src/function.rs b/crates/ra_hir/src/function.rs
index 01f0f3a66..d4159cee2 100644
--- a/crates/ra_hir/src/function.rs
+++ b/crates/ra_hir/src/function.rs
@@ -18,6 +18,7 @@ pub use self::scope::FnScopes;
 #[derive(Clone, Copy, Debug, PartialEq, Eq, Hash)]
 pub struct FnId(pub(crate) DefId);
 
+#[derive(Debug)]
 pub struct Function {
     pub(crate) fn_id: FnId,
 }
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