Merge #2406

2406: Add hygiene information to SourceAnalyzer r=matklad a=edwin0cheng

This should fix https://github.com/rust-analyzer/rust-analyzer/pull/2392#issuecomment-557964686

Co-authored-by: Edwin Cheng <edwin0cheng@gmail.com>

crates/ra_hir/src/source_binder.rs

@@ -14,7 +14,8 @@ use hir_def::{
     DefWithBodyId,
 };
 use hir_expand::{
-    name::AsName, AstId, HirFileId, MacroCallId, MacroCallLoc, MacroFileKind, Source,
+    hygiene::Hygiene, name::AsName, AstId, HirFileId, MacroCallId, MacroCallLoc, MacroFileKind,
+    Source,
 };
 use ra_syntax::{
     ast::{self, AstNode},
@@ -240,10 +241,10 @@ impl SourceAnalyzer {
     pub fn resolve_macro_call(
         &self,
         db: &impl HirDatabase,
-        macro_call: &ast::MacroCall,
+        macro_call: Source<&ast::MacroCall>,
     ) -> Option<MacroDef> {
-        // This must be a normal source file rather than macro file.
-        let path = macro_call.path().and_then(Path::from_ast)?;
+        let hygiene = Hygiene::new(db, macro_call.file_id);
+        let path = macro_call.value.path().and_then(|ast| Path::from_src(ast, &hygiene))?;
         self.resolver.resolve_path_as_macro(db, &path).map(|it| it.into())
     }
 
@@ -445,7 +446,7 @@ impl SourceAnalyzer {
         db: &impl HirDatabase,
         macro_call: Source<&ast::MacroCall>,
     ) -> Option<Expansion> {
-        let def = self.resolve_macro_call(db, macro_call.value)?.id;
+        let def = self.resolve_macro_call(db, macro_call)?.id;
         let ast_id = AstId::new(
             macro_call.file_id,
             db.ast_id_map(macro_call.file_id).ast_id(macro_call.value),

crates/ra_hir_def/src/path.rs

@@ -97,7 +97,7 @@ impl Path {
 
     /// Converts an `ast::Path` to `Path`. Works with use trees.
     /// It correctly handles `$crate` based path from macro call.
-    pub(crate) fn from_src(mut path: ast::Path, hygiene: &Hygiene) -> Option<Path> {
+    pub fn from_src(mut path: ast::Path, hygiene: &Hygiene) -> Option<Path> {
         let mut kind = PathKind::Plain;
         let mut segments = Vec::new();
         loop {

crates/ra_ide_api/src/call_info.rs

@@ -18,12 +18,9 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
     // Find the calling expression and it's NameRef
     let calling_node = FnCallNode::with_node(&syntax, position.offset)?;
     let name_ref = calling_node.name_ref()?;
+    let name_ref = hir::Source::new(position.file_id.into(), name_ref.syntax());
 
-    let analyzer = hir::SourceAnalyzer::new(
-        db,
-        hir::Source::new(position.file_id.into(), name_ref.syntax()),
-        None,
-    );
+    let analyzer = hir::SourceAnalyzer::new(db, name_ref, None);
     let (mut call_info, has_self) = match &calling_node {
         FnCallNode::CallExpr(expr) => {
             //FIXME: Type::as_callable is broken
@@ -44,7 +41,7 @@ pub(crate) fn call_info(db: &RootDatabase, position: FilePosition) -> Option<Cal
             (CallInfo::with_fn(db, function), function.has_self_param(db))
         }
         FnCallNode::MacroCallExpr(expr) => {
-            let macro_def = analyzer.resolve_macro_call(db, &expr)?;
+            let macro_def = analyzer.resolve_macro_call(db, name_ref.with_value(&expr))?;
             (CallInfo::with_macro(db, macro_def)?, false)
         }
     };

crates/ra_ide_api/src/expand_macro.rs

@@ -269,4 +269,27 @@ fn some_thing() -> u32 {
         assert_eq!(res.name, "foo");
         assert_snapshot!(res.expansion, @r###"bar!()"###);
     }
+
+    #[test]
+    fn macro_expand_with_dollar_crate() {
+        let res = check_expand_macro(
+            r#"
+        //- /lib.rs
+        #[macro_export]
+        macro_rules! bar {
+            () => {0};
+        }
+        macro_rules! foo {
+            () => {$crate::bar!()};
+        }        
+
+        fn main() {        
+            let res = fo<|>o!();
+        }
+        "#,
+        );
+
+        assert_eq!(res.name, "foo");
+        assert_snapshot!(res.expansion, @r###"0"###);
+    }
 }

crates/ra_ide_api/src/references/classify.rs

@@ -152,7 +152,7 @@ pub(crate) fn classify_name_ref(
 
     if let Some(macro_call) = parent.ancestors().find_map(ast::MacroCall::cast) {
         tested_by!(goto_definition_works_for_macros);
-        if let Some(macro_def) = analyzer.resolve_macro_call(db, &macro_call) {
+        if let Some(macro_def) = analyzer.resolve_macro_call(db, name_ref.with_value(&macro_call)) {
             let kind = NameKind::Macro(macro_def);
             return Some(NameDefinition { kind, container, visibility });
         }