7 files changed, 200 insertions, 177 deletions

diff --git a/crates/ra_ide_api/src/display.rs b/crates/ra_ide_api/src/display.rs
index a980c56bc..30617412a 100644
--- a/crates/ra_ide_api/src/display.rs
+++ b/crates/ra_ide_api/src/display.rs
@@ -15,7 +15,7 @@ pub use function_signature::FunctionSignature;
 pub use navigation_target::NavigationTarget;
 pub use structure::{file_structure, StructureNode};
 
-pub(crate) use navigation_target::{description_from_symbol, docs_from_symbol};
+pub(crate) use navigation_target::{description_from_symbol, docs_from_symbol, ToNav};
 pub(crate) use short_label::ShortLabel;
 
 pub(crate) fn function_label(node: &ast::FnDef) -> String {
diff --git a/crates/ra_ide_api/src/display/navigation_target.rs b/crates/ra_ide_api/src/display/navigation_target.rs
index 1bf81e7d5..41d467564 100644
--- a/crates/ra_ide_api/src/display/navigation_target.rs
+++ b/crates/ra_ide_api/src/display/navigation_target.rs
@@ -29,19 +29,8 @@ pub struct NavigationTarget {
     docs: Option<String>,
 }
 
-fn find_range_from_node(
-    db: &RootDatabase,
-    src: hir::HirFileId,
-    node: &SyntaxNode,
-) -> (FileId, TextRange) {
-    let text_range = node.text_range();
-    let (file_id, text_range) = src
-        .expansion_info(db)
-        .and_then(|expansion_info| expansion_info.find_range(text_range))
-        .unwrap_or((src, text_range));
-
-    // FIXME: handle recursive macro generated macro
-    (file_id.original_file(db), text_range)
+pub(crate) trait ToNav {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget;
 }
 
 impl NavigationTarget {
@@ -95,19 +84,6 @@ impl NavigationTarget {
         NavigationTarget::from_named(db, file_id.into(), pat, None, None)
     }
 
-    pub(crate) fn from_symbol(db: &RootDatabase, symbol: FileSymbol) -> NavigationTarget {
-        NavigationTarget {
-            file_id: symbol.file_id,
-            name: symbol.name.clone(),
-            kind: symbol.ptr.kind(),
-            full_range: symbol.ptr.range(),
-            focus_range: symbol.name_range,
-            container_name: symbol.container_name.clone(),
-            description: description_from_symbol(db, &symbol),
-            docs: docs_from_symbol(db, &symbol),
-        }
-    }
-
     pub(crate) fn from_pat(
         db: &RootDatabase,
         file_id: FileId,
@@ -136,39 +112,6 @@ impl NavigationTarget {
         }
     }
 
-    pub(crate) fn from_module(db: &RootDatabase, module: hir::Module) -> NavigationTarget {
-        let src = module.definition_source(db);
-        let name = module.name(db).map(|it| it.to_string().into()).unwrap_or_default();
-        match src.ast {
-            ModuleSource::SourceFile(node) => {
-                let (file_id, text_range) = find_range_from_node(db, src.file_id, node.syntax());
-
-                NavigationTarget::from_syntax(
-                    file_id,
-                    name,
-                    None,
-                    text_range,
-                    node.syntax(),
-                    None,
-                    None,
-                )
-            }
-            ModuleSource::Module(node) => {
-                let (file_id, text_range) = find_range_from_node(db, src.file_id, node.syntax());
-
-                NavigationTarget::from_syntax(
-                    file_id,
-                    name,
-                    None,
-                    text_range,
-                    node.syntax(),
-                    node.doc_comment_text(),
-                    node.short_label(),
-                )
-            }
-        }
-    }
-
     pub(crate) fn from_module_to_decl(db: &RootDatabase, module: hir::Module) -> NavigationTarget {
         let name = module.name(db).map(|it| it.to_string().into()).unwrap_or_default();
         if let Some(src) = module.declaration_source(db) {
@@ -183,55 +126,7 @@ impl NavigationTarget {
                 src.ast.short_label(),
             );
         }
-        NavigationTarget::from_module(db, module)
-    }
-
-    pub(crate) fn from_field(db: &RootDatabase, field: hir::StructField) -> NavigationTarget {
-        let src = field.source(db);
-        match src.ast {
-            FieldSource::Named(it) => NavigationTarget::from_named(
-                db,
-                src.file_id,
-                &it,
-                it.doc_comment_text(),
-                it.short_label(),
-            ),
-            FieldSource::Pos(it) => {
-                let (file_id, text_range) = find_range_from_node(db, src.file_id, it.syntax());
-                NavigationTarget::from_syntax(
-                    file_id,
-                    "".into(),
-                    None,
-                    text_range,
-                    it.syntax(),
-                    None,
-                    None,
-                )
-            }
-        }
-    }
-
-    pub(crate) fn from_def_source<A, D>(db: &RootDatabase, def: D) -> NavigationTarget
-    where
-        D: HasSource<Ast = A>,
-        A: ast::DocCommentsOwner + ast::NameOwner + ShortLabel,
-    {
-        let src = def.source(db);
-        NavigationTarget::from_named(
-            db,
-            src.file_id,
-            &src.ast,
-            src.ast.doc_comment_text(),
-            src.ast.short_label(),
-        )
-    }
-
-    pub(crate) fn from_adt_def(db: &RootDatabase, adt_def: hir::Adt) -> NavigationTarget {
-        match adt_def {
-            hir::Adt::Struct(it) => NavigationTarget::from_def_source(db, it),
-            hir::Adt::Union(it) => NavigationTarget::from_def_source(db, it),
-            hir::Adt::Enum(it) => NavigationTarget::from_def_source(db, it),
-        }
+        module.to_nav(db)
     }
 
     pub(crate) fn from_def(
@@ -239,14 +134,14 @@ impl NavigationTarget {
         module_def: hir::ModuleDef,
     ) -> Option<NavigationTarget> {
         let nav = match module_def {
-            hir::ModuleDef::Module(module) => NavigationTarget::from_module(db, module),
-            hir::ModuleDef::Function(func) => NavigationTarget::from_def_source(db, func),
-            hir::ModuleDef::Adt(it) => NavigationTarget::from_adt_def(db, it),
-            hir::ModuleDef::Const(it) => NavigationTarget::from_def_source(db, it),
-            hir::ModuleDef::Static(it) => NavigationTarget::from_def_source(db, it),
-            hir::ModuleDef::EnumVariant(it) => NavigationTarget::from_def_source(db, it),
-            hir::ModuleDef::Trait(it) => NavigationTarget::from_def_source(db, it),
-            hir::ModuleDef::TypeAlias(it) => NavigationTarget::from_def_source(db, it),
+            hir::ModuleDef::Module(module) => module.to_nav(db),
+            hir::ModuleDef::Function(it) => it.to_nav(db),
+            hir::ModuleDef::Adt(it) => it.to_nav(db),
+            hir::ModuleDef::Const(it) => it.to_nav(db),
+            hir::ModuleDef::Static(it) => it.to_nav(db),
+            hir::ModuleDef::EnumVariant(it) => it.to_nav(db),
+            hir::ModuleDef::Trait(it) => it.to_nav(db),
+            hir::ModuleDef::TypeAlias(it) => it.to_nav(db),
             hir::ModuleDef::BuiltinType(..) => {
                 return None;
             }
@@ -254,41 +149,6 @@ impl NavigationTarget {
         Some(nav)
     }
 
-    pub(crate) fn from_impl_block(
-        db: &RootDatabase,
-        impl_block: hir::ImplBlock,
-    ) -> NavigationTarget {
-        let src = impl_block.source(db);
-        let (file_id, text_range) = find_range_from_node(db, src.file_id, src.ast.syntax());
-
-        NavigationTarget::from_syntax(
-            file_id,
-            "impl".into(),
-            None,
-            text_range,
-            src.ast.syntax(),
-            None,
-            None,
-        )
-    }
-
-    pub(crate) fn from_assoc_item(
-        db: &RootDatabase,
-        assoc_item: hir::AssocItem,
-    ) -> NavigationTarget {
-        match assoc_item {
-            AssocItem::Function(it) => NavigationTarget::from_def_source(db, it),
-            AssocItem::Const(it) => NavigationTarget::from_def_source(db, it),
-            AssocItem::TypeAlias(it) => NavigationTarget::from_def_source(db, it),
-        }
-    }
-
-    pub(crate) fn from_macro_def(db: &RootDatabase, macro_call: hir::MacroDef) -> NavigationTarget {
-        let src = macro_call.source(db);
-        log::debug!("nav target {:#?}", src.ast.syntax());
-        NavigationTarget::from_named(db, src.file_id, &src.ast, src.ast.doc_comment_text(), None)
-    }
-
     #[cfg(test)]
     pub(crate) fn assert_match(&self, expected: &str) {
         let actual = self.debug_render();
@@ -359,6 +219,172 @@ impl NavigationTarget {
     }
 }
 
+impl ToNav for FileSymbol {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        NavigationTarget {
+            file_id: self.file_id,
+            name: self.name.clone(),
+            kind: self.ptr.kind(),
+            full_range: self.ptr.range(),
+            focus_range: self.name_range,
+            container_name: self.container_name.clone(),
+            description: description_from_symbol(db, self),
+            docs: docs_from_symbol(db, self),
+        }
+    }
+}
+
+pub(crate) trait ToNavFromAst {}
+impl ToNavFromAst for hir::Function {}
+impl ToNavFromAst for hir::Const {}
+impl ToNavFromAst for hir::Static {}
+impl ToNavFromAst for hir::Struct {}
+impl ToNavFromAst for hir::Enum {}
+impl ToNavFromAst for hir::EnumVariant {}
+impl ToNavFromAst for hir::Union {}
+impl ToNavFromAst for hir::TypeAlias {}
+impl ToNavFromAst for hir::Trait {}
+
+impl<D> ToNav for D
+where
+    D: HasSource + ToNavFromAst + Copy,
+    D::Ast: ast::DocCommentsOwner + ast::NameOwner + ShortLabel,
+{
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        let src = self.source(db);
+        NavigationTarget::from_named(
+            db,
+            src.file_id,
+            &src.ast,
+            src.ast.doc_comment_text(),
+            src.ast.short_label(),
+        )
+    }
+}
+
+impl ToNav for hir::Module {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        let src = self.definition_source(db);
+        let name = self.name(db).map(|it| it.to_string().into()).unwrap_or_default();
+        match src.ast {
+            ModuleSource::SourceFile(node) => {
+                let (file_id, text_range) = find_range_from_node(db, src.file_id, node.syntax());
+
+                NavigationTarget::from_syntax(
+                    file_id,
+                    name,
+                    None,
+                    text_range,
+                    node.syntax(),
+                    None,
+                    None,
+                )
+            }
+            ModuleSource::Module(node) => {
+                let (file_id, text_range) = find_range_from_node(db, src.file_id, node.syntax());
+
+                NavigationTarget::from_syntax(
+                    file_id,
+                    name,
+                    None,
+                    text_range,
+                    node.syntax(),
+                    node.doc_comment_text(),
+                    node.short_label(),
+                )
+            }
+        }
+    }
+}
+
+impl ToNav for hir::ImplBlock {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        let src = self.source(db);
+        let (file_id, text_range) = find_range_from_node(db, src.file_id, src.ast.syntax());
+
+        NavigationTarget::from_syntax(
+            file_id,
+            "impl".into(),
+            None,
+            text_range,
+            src.ast.syntax(),
+            None,
+            None,
+        )
+    }
+}
+
+impl ToNav for hir::StructField {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        let src = self.source(db);
+
+        match src.ast {
+            FieldSource::Named(it) => NavigationTarget::from_named(
+                db,
+                src.file_id,
+                &it,
+                it.doc_comment_text(),
+                it.short_label(),
+            ),
+            FieldSource::Pos(it) => {
+                let (file_id, text_range) = find_range_from_node(db, src.file_id, it.syntax());
+                NavigationTarget::from_syntax(
+                    file_id,
+                    "".into(),
+                    None,
+                    text_range,
+                    it.syntax(),
+                    None,
+                    None,
+                )
+            }
+        }
+    }
+}
+
+impl ToNav for hir::MacroDef {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        let src = self.source(db);
+        log::debug!("nav target {:#?}", src.ast.syntax());
+        NavigationTarget::from_named(db, src.file_id, &src.ast, src.ast.doc_comment_text(), None)
+    }
+}
+
+impl ToNav for hir::Adt {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        match self {
+            hir::Adt::Struct(it) => it.to_nav(db),
+            hir::Adt::Union(it) => it.to_nav(db),
+            hir::Adt::Enum(it) => it.to_nav(db),
+        }
+    }
+}
+
+impl ToNav for hir::AssocItem {
+    fn to_nav(&self, db: &RootDatabase) -> NavigationTarget {
+        match self {
+            AssocItem::Function(it) => it.to_nav(db),
+            AssocItem::Const(it) => it.to_nav(db),
+            AssocItem::TypeAlias(it) => it.to_nav(db),
+        }
+    }
+}
+
+fn find_range_from_node(
+    db: &RootDatabase,
+    src: hir::HirFileId,
+    node: &SyntaxNode,
+) -> (FileId, TextRange) {
+    let text_range = node.text_range();
+    let (file_id, text_range) = src
+        .expansion_info(db)
+        .and_then(|expansion_info| expansion_info.find_range(text_range))
+        .unwrap_or((src, text_range));
+
+    // FIXME: handle recursive macro generated macro
+    (file_id.original_file(db), text_range)
+}
+
 pub(crate) fn docs_from_symbol(db: &RootDatabase, symbol: &FileSymbol) -> Option<String> {
     let parse = db.parse(symbol.file_id);
     let node = symbol.ptr.to_node(parse.tree().syntax());
diff --git a/crates/ra_ide_api/src/goto_definition.rs b/crates/ra_ide_api/src/goto_definition.rs
index afa59cbe3..713b61d5e 100644
--- a/crates/ra_ide_api/src/goto_definition.rs
+++ b/crates/ra_ide_api/src/goto_definition.rs
@@ -9,7 +9,7 @@ use ra_syntax::{
 
 use crate::{
     db::RootDatabase,
-    display::ShortLabel,
+    display::{ShortLabel, ToNav},
     references::{classify_name_ref, NameKind::*},
     FilePosition, NavigationTarget, RangeInfo,
 };
@@ -56,16 +56,16 @@ pub(crate) fn reference_definition(
 
     let name_kind = classify_name_ref(db, file_id, &name_ref).map(|d| d.kind);
     match name_kind {
-        Some(Macro(mac)) => return Exact(NavigationTarget::from_macro_def(db, mac)),
-        Some(Field(field)) => return Exact(NavigationTarget::from_field(db, field)),
-        Some(AssocItem(assoc)) => return Exact(NavigationTarget::from_assoc_item(db, assoc)),
+        Some(Macro(mac)) => return Exact(mac.to_nav(db)),
+        Some(Field(field)) => return Exact(field.to_nav(db)),
+        Some(AssocItem(assoc)) => return Exact(assoc.to_nav(db)),
         Some(Def(def)) => match NavigationTarget::from_def(db, def) {
             Some(nav) => return Exact(nav),
             None => return Approximate(vec![]),
         },
         Some(SelfType(ty)) => {
-            if let Some((def_id, _)) = ty.as_adt() {
-                return Exact(NavigationTarget::from_adt_def(db, def_id));
+            if let Some((adt, _)) = ty.as_adt() {
+                return Exact(adt.to_nav(db));
             }
         }
         Some(Pat((_, pat))) => return Exact(NavigationTarget::from_pat(db, file_id, pat)),
@@ -79,7 +79,7 @@ pub(crate) fn reference_definition(
     // Fallback index based approach:
     let navs = crate::symbol_index::index_resolve(db, name_ref)
         .into_iter()
-        .map(|s| NavigationTarget::from_symbol(db, s))
+        .map(|s| s.to_nav(db))
         .collect();
     Approximate(navs)
 }
@@ -95,7 +95,7 @@ pub(crate) fn name_definition(
         if module.has_semi() {
             let src = hir::Source { file_id: file_id.into(), ast: module };
             if let Some(child_module) = hir::Module::from_declaration(db, src) {
-                let nav = NavigationTarget::from_module(db, child_module);
+                let nav = child_module.to_nav(db);
                 return Some(vec![nav]);
             }
         }
diff --git a/crates/ra_ide_api/src/goto_type_definition.rs b/crates/ra_ide_api/src/goto_type_definition.rs
index 059d80524..71146591d 100644
--- a/crates/ra_ide_api/src/goto_type_definition.rs
+++ b/crates/ra_ide_api/src/goto_type_definition.rs
@@ -3,7 +3,7 @@
 use ra_db::SourceDatabase;
 use ra_syntax::{ast, AstNode};
 
-use crate::{db::RootDatabase, FilePosition, NavigationTarget, RangeInfo};
+use crate::{db::RootDatabase, display::ToNav, FilePosition, NavigationTarget, RangeInfo};
 
 pub(crate) fn goto_type_definition(
     db: &RootDatabase,
@@ -33,7 +33,7 @@ pub(crate) fn goto_type_definition(
 
     let adt_def = analyzer.autoderef(db, ty).find_map(|ty| ty.as_adt().map(|adt| adt.0))?;
 
-    let nav = NavigationTarget::from_adt_def(db, adt_def);
+    let nav = adt_def.to_nav(db);
     Some(RangeInfo::new(node.text_range(), vec![nav]))
 }
 
diff --git a/crates/ra_ide_api/src/impls.rs b/crates/ra_ide_api/src/impls.rs
index b899ed3a5..bc9b66550 100644
--- a/crates/ra_ide_api/src/impls.rs
+++ b/crates/ra_ide_api/src/impls.rs
@@ -4,7 +4,7 @@ use hir::{db::HirDatabase, ApplicationTy, FromSource, Ty, TypeCtor};
 use ra_db::SourceDatabase;
 use ra_syntax::{algo::find_node_at_offset, ast, AstNode};
 
-use crate::{db::RootDatabase, FilePosition, NavigationTarget, RangeInfo};
+use crate::{db::RootDatabase, display::ToNav, FilePosition, NavigationTarget, RangeInfo};
 
 pub(crate) fn goto_implementation(
     db: &RootDatabase,
@@ -58,7 +58,7 @@ fn impls_for_def(
         impls
             .all_impls()
             .filter(|impl_block| is_equal_for_find_impls(&ty, &impl_block.target_ty(db)))
-            .map(|imp| NavigationTarget::from_impl_block(db, imp))
+            .map(|imp| imp.to_nav(db))
             .collect(),
     )
 }
@@ -75,12 +75,7 @@ fn impls_for_trait(
     let krate = module.krate();
     let impls = db.impls_in_crate(krate);
 
-    Some(
-        impls
-            .lookup_impl_blocks_for_trait(tr)
-            .map(|imp| NavigationTarget::from_impl_block(db, imp))
-            .collect(),
-    )
+    Some(impls.lookup_impl_blocks_for_trait(tr).map(|imp| imp.to_nav(db)).collect())
 }
 
 fn is_equal_for_find_impls(original_ty: &Ty, impl_ty: &Ty) -> bool {
diff --git a/crates/ra_ide_api/src/lib.rs b/crates/ra_ide_api/src/lib.rs
index d0188da44..484fbcc82 100644
--- a/crates/ra_ide_api/src/lib.rs
+++ b/crates/ra_ide_api/src/lib.rs
@@ -56,7 +56,7 @@ use ra_db::{
 };
 use ra_syntax::{SourceFile, TextRange, TextUnit};
 
-use crate::{db::LineIndexDatabase, symbol_index::FileSymbol};
+use crate::{db::LineIndexDatabase, display::ToNav, symbol_index::FileSymbol};
 
 pub use crate::{
     assists::{Assist, AssistId},
@@ -351,7 +351,7 @@ impl Analysis {
         self.with_db(|db| {
             symbol_index::world_symbols(db, query)
                 .into_iter()
-                .map(|s| NavigationTarget::from_symbol(db, s))
+                .map(|s| s.to_nav(db))
                 .collect::<Vec<_>>()
         })
     }
diff --git a/crates/ra_ide_api/src/references.rs b/crates/ra_ide_api/src/references.rs
index b5b1c9a16..0a76bf484 100644
--- a/crates/ra_ide_api/src/references.rs
+++ b/crates/ra_ide_api/src/references.rs
@@ -19,7 +19,9 @@ use ra_db::{SourceDatabase, SourceDatabaseExt};
 use ra_prof::profile;
 use ra_syntax::{algo::find_node_at_offset, ast, AstNode, SourceFile, SyntaxNode, TextUnit};
 
-use crate::{db::RootDatabase, FilePosition, FileRange, NavigationTarget, RangeInfo};
+use crate::{
+    db::RootDatabase, display::ToNav, FilePosition, FileRange, NavigationTarget, RangeInfo,
+};
 
 pub(crate) use self::{
     classify::{classify_name, classify_name_ref},
@@ -76,12 +78,12 @@ pub(crate) fn find_all_refs(
     let RangeInfo { range, info: (name, def) } = find_name(db, &syntax, position)?;
 
     let declaration = match def.kind {
-        NameKind::Macro(mac) => NavigationTarget::from_macro_def(db, mac),
-        NameKind::Field(field) => NavigationTarget::from_field(db, field),
-        NameKind::AssocItem(assoc) => NavigationTarget::from_assoc_item(db, assoc),
+        NameKind::Macro(mac) => mac.to_nav(db),
+        NameKind::Field(field) => field.to_nav(db),
+        NameKind::AssocItem(assoc) => assoc.to_nav(db),
         NameKind::Def(def) => NavigationTarget::from_def(db, def)?,
         NameKind::SelfType(ref ty) => match ty.as_adt() {
-            Some((def_id, _)) => NavigationTarget::from_adt_def(db, def_id),
+            Some((adt, _)) => adt.to_nav(db),
             None => return None,
         },
         NameKind::Pat((_, pat)) => NavigationTarget::from_pat(db, position.file_id, pat),