Rust: use macro to inject extraction functions for detached properties

Author: aibaars

rust/ast-generator/src/main.rs

@@ -419,8 +419,9 @@ fn write_extractor(grammar: &AstSrc) -> std::io::Result<String> {
         "//! Generated by `ast-generator`, do not edit by hand.\n
 #![cfg_attr(any(), rustfmt::skip)]
 
-use crate::generated;
 use super::base::{{TextValue, Translator}};
+use crate::emit_detached;
+use crate::generated;
 use crate::trap::{{Label, TrapId}};
 use ra_ap_syntax::ast::{{
     HasArgList, HasAttrs, HasGenericArgs, HasGenericParams, HasLoopBody, HasModuleItem, HasName,
@@ -520,6 +521,11 @@ impl Translator<'_> {{
         }
         writeln!(buf, "        }});")?;
         writeln!(buf, "        self.emit_location(label, &node);")?;
+        writeln!(
+            buf,
+            "        emit_detached!({}, self, node, label);",
+            class_name
+        )?;
         writeln!(
             buf,
             "        self.emit_tokens(&node, label.into(), node.syntax().children_with_tokens());"

rust/extractor/src/translate/base.rs

@@ -14,6 +14,15 @@ use ra_ap_syntax::ast::RangeItem;
 use ra_ap_syntax::{
     ast, AstNode, NodeOrToken, SyntaxElementChildren, SyntaxError, SyntaxToken, TextRange,
 };
+
+#[macro_export]
+macro_rules! emit_detached {
+    (MacroCall, $self:ident, $node:ident, $label:ident) => {
+        $self.extract_macro_call_expanded(&$node, $label.into());
+    };
+    ($($_:tt)*) => {};
+}
+
 pub trait TextValue {
     fn try_get_text(&self) -> Option<String>;
 }