From 4768e5fb23c058eba90f0a1dcd6e9d5c0ecdee1b Mon Sep 17 00:00:00 2001
From: Aleksey Kladov <aleksey.kladov@gmail.com>
Date: Mon, 14 Jun 2021 19:32:39 +0300
Subject: internal: document diagnostics crate

---
 .../src/handlers/unresolved_macro_call.rs          | 84 ++++++++++++++++++++++
 1 file changed, 84 insertions(+)
 create mode 100644 crates/ide_diagnostics/src/handlers/unresolved_macro_call.rs

(limited to 'crates/ide_diagnostics/src/handlers/unresolved_macro_call.rs')

diff --git a/crates/ide_diagnostics/src/handlers/unresolved_macro_call.rs b/crates/ide_diagnostics/src/handlers/unresolved_macro_call.rs
new file mode 100644
index 000000000..4c3c1c19a
--- /dev/null
+++ b/crates/ide_diagnostics/src/handlers/unresolved_macro_call.rs
@@ -0,0 +1,84 @@
+use hir::{db::AstDatabase, InFile};
+use syntax::{AstNode, SyntaxNodePtr};
+
+use crate::{Diagnostic, DiagnosticsContext};
+
+// Diagnostic: unresolved-macro-call
+//
+// This diagnostic is triggered if rust-analyzer is unable to resolve the path
+// to a macro in a macro invocation.
+pub(crate) fn unresolved_macro_call(
+    ctx: &DiagnosticsContext<'_>,
+    d: &hir::UnresolvedMacroCall,
+) -> Diagnostic {
+    let last_path_segment = ctx.sema.db.parse_or_expand(d.macro_call.file_id).and_then(|root| {
+        d.macro_call
+            .value
+            .to_node(&root)
+            .path()
+            .and_then(|it| it.segment())
+            .and_then(|it| it.name_ref())
+            .map(|it| InFile::new(d.macro_call.file_id, SyntaxNodePtr::new(it.syntax())))
+    });
+    let diagnostics = last_path_segment.unwrap_or_else(|| d.macro_call.clone().map(|it| it.into()));
+
+    Diagnostic::new(
+        "unresolved-macro-call",
+        format!("unresolved macro `{}!`", d.path),
+        ctx.sema.diagnostics_display_range(diagnostics).range,
+    )
+    .experimental()
+}
+
+#[cfg(test)]
+mod tests {
+    use crate::tests::check_diagnostics;
+
+    #[test]
+    fn unresolved_macro_diag() {
+        check_diagnostics(
+            r#"
+fn f() {
+    m!();
+} //^ unresolved macro `m!`
+
+"#,
+        );
+    }
+
+    #[test]
+    fn test_unresolved_macro_range() {
+        check_diagnostics(
+            r#"
+foo::bar!(92);
+   //^^^ unresolved macro `foo::bar!`
+"#,
+        );
+    }
+
+    #[test]
+    fn unresolved_legacy_scope_macro() {
+        check_diagnostics(
+            r#"
+macro_rules! m { () => {} }
+
+m!(); m2!();
+    //^^ unresolved macro `self::m2!`
+"#,
+        );
+    }
+
+    #[test]
+    fn unresolved_module_scope_macro() {
+        check_diagnostics(
+            r#"
+mod mac {
+#[macro_export]
+macro_rules! m { () => {} } }
+
+self::m!(); self::m2!();
+                //^^ unresolved macro `self::m2!`
+"#,
+        );
+    }
+}
-- 
cgit v1.2.3