From 13735d91a78ba51fb202cb7dde1dfe25420afe9a Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Sat, 2 Nov 2019 23:42:38 +0300
Subject: Move diagnostics to hir_expand

---
 crates/ra_hir/src/diagnostics.rs | 81 +++-------------------------------------
 1 file changed, 6 insertions(+), 75 deletions(-)

(limited to 'crates/ra_hir/src/diagnostics.rs')

diff --git a/crates/ra_hir/src/diagnostics.rs b/crates/ra_hir/src/diagnostics.rs
index 9acdaf8ed..a33af8f46 100644
--- a/crates/ra_hir/src/diagnostics.rs
+++ b/crates/ra_hir/src/diagnostics.rs
@@ -1,82 +1,13 @@
 //! FIXME: write short doc here
 
-use std::{any::Any, fmt};
+use std::any::Any;
 
-use ra_syntax::{ast, AstNode, AstPtr, SyntaxNode, SyntaxNodePtr, TextRange};
+use ra_syntax::{ast, AstNode, AstPtr, SyntaxNodePtr};
 use relative_path::RelativePathBuf;
 
-use crate::{db::HirDatabase, HirFileId, Name, Source};
-
-/// Diagnostic defines hir API for errors and warnings.
-///
-/// It is used as a `dyn` object, which you can downcast to a concrete
-/// diagnostic. DiagnosticSink are structured, meaning that they include rich
-/// information which can be used by IDE to create fixes. DiagnosticSink are
-/// expressed in terms of macro-expanded syntax tree nodes (so, it's a bad idea
-/// to diagnostic in a salsa value).
-///
-/// Internally, various subsystems of hir produce diagnostics specific to a
-/// subsystem (typically, an `enum`), which are safe to store in salsa but do not
-/// include source locations. Such internal diagnostic are transformed into an
-/// instance of `Diagnostic` on demand.
-pub trait Diagnostic: Any + Send + Sync + fmt::Debug + 'static {
-    fn message(&self) -> String;
-    fn source(&self) -> Source<SyntaxNodePtr>;
-    fn highlight_range(&self) -> TextRange {
-        self.source().ast.range()
-    }
-    fn as_any(&self) -> &(dyn Any + Send + 'static);
-}
-
-pub trait AstDiagnostic {
-    type AST;
-    fn ast(&self, db: &impl HirDatabase) -> Self::AST;
-}
-
-impl dyn Diagnostic {
-    pub fn syntax_node(&self, db: &impl HirDatabase) -> SyntaxNode {
-        let node = db.parse_or_expand(self.source().file_id).unwrap();
-        self.source().ast.to_node(&node)
-    }
-
-    pub fn downcast_ref<D: Diagnostic>(&self) -> Option<&D> {
-        self.as_any().downcast_ref()
-    }
-}
+use crate::{db::AstDatabase, HirFileId, Name, Source};
 
-pub struct DiagnosticSink<'a> {
-    callbacks: Vec<Box<dyn FnMut(&dyn Diagnostic) -> Result<(), ()> + 'a>>,
-    default_callback: Box<dyn FnMut(&dyn Diagnostic) + 'a>,
-}
-
-impl<'a> DiagnosticSink<'a> {
-    pub fn new(cb: impl FnMut(&dyn Diagnostic) + 'a) -> DiagnosticSink<'a> {
-        DiagnosticSink { callbacks: Vec::new(), default_callback: Box::new(cb) }
-    }
-
-    pub fn on<D: Diagnostic, F: FnMut(&D) + 'a>(mut self, mut cb: F) -> DiagnosticSink<'a> {
-        let cb = move |diag: &dyn Diagnostic| match diag.downcast_ref::<D>() {
-            Some(d) => {
-                cb(d);
-                Ok(())
-            }
-            None => Err(()),
-        };
-        self.callbacks.push(Box::new(cb));
-        self
-    }
-
-    pub(crate) fn push(&mut self, d: impl Diagnostic) {
-        let d: &dyn Diagnostic = &d;
-        for cb in self.callbacks.iter_mut() {
-            match cb(d) {
-                Ok(()) => return,
-                Err(()) => (),
-            }
-        }
-        (self.default_callback)(d)
-    }
-}
+pub use hir_expand::diagnostics::{AstDiagnostic, Diagnostic, DiagnosticSink};
 
 #[derive(Debug)]
 pub struct NoSuchField {
@@ -139,7 +70,7 @@ impl Diagnostic for MissingFields {
 impl AstDiagnostic for MissingFields {
     type AST = ast::RecordFieldList;
 
-    fn ast(&self, db: &impl HirDatabase) -> Self::AST {
+    fn ast(&self, db: &impl AstDatabase) -> Self::AST {
         let root = db.parse_or_expand(self.source().file_id).unwrap();
         let node = self.source().ast.to_node(&root);
         ast::RecordFieldList::cast(node).unwrap()
@@ -167,7 +98,7 @@ impl Diagnostic for MissingOkInTailExpr {
 impl AstDiagnostic for MissingOkInTailExpr {
     type AST = ast::Expr;
 
-    fn ast(&self, db: &impl HirDatabase) -> Self::AST {
+    fn ast(&self, db: &impl AstDatabase) -> Self::AST {
         let root = db.parse_or_expand(self.file).unwrap();
         let node = self.source().ast.to_node(&root);
         ast::Expr::cast(node).unwrap()
-- 
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