Refactor primary IDE API

This introduces the new type -- Semantics.
Semantics maps SyntaxNodes to various semantic info, such as type,
name resolution or macro expansions.

To do so, Semantics maintains a HashMap which maps every node it saw
to the file from which the node originated. This is enough to get all
the necessary hir bits just from syntax.

2 files changed, 27 insertions, 49 deletions

diff --git a/crates/ra_ide_db/src/defs.rs b/crates/ra_ide_db/src/defs.rs
index 04c214624..e10e72f71 100644
--- a/crates/ra_ide_db/src/defs.rs
+++ b/crates/ra_ide_db/src/defs.rs
@@ -6,8 +6,8 @@
 // FIXME: this badly needs rename/rewrite (matklad, 2020-02-06).
 
 use hir::{
-    Adt, FieldSource, HasSource, ImplBlock, InFile, Local, MacroDef, Module, ModuleDef,
-    SourceBinder, StructField, TypeParam,
+    Adt, FieldSource, HasSource, ImplBlock, Local, MacroDef, Module, ModuleDef, Semantics,
+    StructField, TypeParam,
 };
 use ra_prof::profile;
 use ra_syntax::{
@@ -68,78 +68,62 @@ impl NameDefinition {
     }
 }
 
-pub fn classify_name(
-    sb: &mut SourceBinder<RootDatabase>,
-    name: InFile<&ast::Name>,
-) -> Option<NameDefinition> {
+pub fn classify_name(sema: &Semantics<RootDatabase>, name: &ast::Name) -> Option<NameDefinition> {
     let _p = profile("classify_name");
-    let parent = name.value.syntax().parent()?;
+    let parent = name.syntax().parent()?;
 
     match_ast! {
         match parent {
             ast::BindPat(it) => {
-                let src = name.with_value(it);
-                let local = sb.to_def(src)?;
+                let local = sema.to_def(&it)?;
                 Some(NameDefinition::Local(local))
             },
             ast::RecordFieldDef(it) => {
-                let src = name.with_value(it);
-                let field: hir::StructField = sb.to_def(src)?;
+                let field: hir::StructField = sema.to_def(&it)?;
                 Some(from_struct_field(field))
             },
             ast::Module(it) => {
-                let def = sb.to_def(name.with_value(it))?;
+                let def = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::StructDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Struct = sb.to_def(src)?;
+                let def: hir::Struct = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::EnumDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Enum = sb.to_def(src)?;
+                let def: hir::Enum = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::TraitDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Trait = sb.to_def(src)?;
+                let def: hir::Trait = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::StaticDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Static = sb.to_def(src)?;
+                let def: hir::Static = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::EnumVariant(it) => {
-                let src = name.with_value(it);
-                let def: hir::EnumVariant = sb.to_def(src)?;
+                let def: hir::EnumVariant = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::FnDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Function = sb.to_def(src)?;
+                let def: hir::Function = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::ConstDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::Const = sb.to_def(src)?;
+                let def: hir::Const = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::TypeAliasDef(it) => {
-                let src = name.with_value(it);
-                let def: hir::TypeAlias = sb.to_def(src)?;
+                let def: hir::TypeAlias = sema.to_def(&it)?;
                 Some(from_module_def(def.into()))
             },
             ast::MacroCall(it) => {
-                let src = name.with_value(it);
-                let def = sb.to_def(src.clone())?;
-
+                let def = sema.to_def(&it)?;
                 Some(NameDefinition::Macro(def))
             },
             ast::TypeParam(it) => {
-                let src = name.with_value(it);
-                let def = sb.to_def(src)?;
+                let def = sema.to_def(&it)?;
                 Some(NameDefinition::TypeParam(def))
             },
             _ => None,
diff --git a/crates/ra_ide_db/src/imports_locator.rs b/crates/ra_ide_db/src/imports_locator.rs
index b8dd358a9..e590d2a5c 100644
--- a/crates/ra_ide_db/src/imports_locator.rs
+++ b/crates/ra_ide_db/src/imports_locator.rs
@@ -1,7 +1,7 @@
 //! This module contains an import search funcionality that is provided to the ra_assists module.
 //! Later, this should be moved away to a separate crate that is accessible from the ra_assists module.
 
-use hir::{db::HirDatabase, ModuleDef, SourceBinder};
+use hir::{ModuleDef, Semantics};
 use ra_prof::profile;
 use ra_syntax::{ast, AstNode, SyntaxKind::NAME};
 
@@ -12,17 +12,17 @@ use crate::{
 };
 
 pub struct ImportsLocator<'a> {
-    source_binder: SourceBinder<'a, RootDatabase>,
+    sema: Semantics<'a, RootDatabase>,
 }
 
 impl<'a> ImportsLocator<'a> {
     pub fn new(db: &'a RootDatabase) -> Self {
-        Self { source_binder: SourceBinder::new(db) }
+        Self { sema: Semantics::new(db) }
     }
 
     pub fn find_imports(&mut self, name_to_import: &str) -> Vec<ModuleDef> {
         let _p = profile("search_for_imports");
-        let db = self.source_binder.db;
+        let db = self.sema.db;
 
         let project_results = {
             let mut query = Query::new(name_to_import.to_string());
@@ -41,7 +41,7 @@ impl<'a> ImportsLocator<'a> {
         project_results
             .into_iter()
             .chain(lib_results.into_iter())
-            .filter_map(|import_candidate| self.get_name_definition(db, &import_candidate))
+            .filter_map(|import_candidate| self.get_name_definition(&import_candidate))
             .filter_map(|name_definition_to_import| match name_definition_to_import {
                 NameDefinition::ModuleDef(module_def) => Some(module_def),
                 _ => None,
@@ -49,22 +49,16 @@ impl<'a> ImportsLocator<'a> {
             .collect()
     }
 
-    fn get_name_definition(
-        &mut self,
-        db: &impl HirDatabase,
-        import_candidate: &FileSymbol,
-    ) -> Option<NameDefinition> {
+    fn get_name_definition(&mut self, import_candidate: &FileSymbol) -> Option<NameDefinition> {
         let _p = profile("get_name_definition");
-        let file_id = import_candidate.file_id.into();
-        let candidate_node = import_candidate.ptr.to_node(&db.parse_or_expand(file_id)?);
+        let file_id = import_candidate.file_id;
+
+        let candidate_node = import_candidate.ptr.to_node(self.sema.parse(file_id).syntax());
         let candidate_name_node = if candidate_node.kind() != NAME {
             candidate_node.children().find(|it| it.kind() == NAME)?
         } else {
             candidate_node
         };
-        classify_name(
-            &mut self.source_binder,
-            hir::InFile { file_id, value: &ast::Name::cast(candidate_name_node)? },
-        )
+        classify_name(&self.sema, &ast::Name::cast(candidate_name_node)?)
     }
 }