1 files changed, 31 insertions, 0 deletions
diff --git a/third_party/rust/jsparagus-emitter/src/expression_emitter.rs b/third_party/rust/jsparagus-emitter/src/expression_emitter.rs
new file mode 100644
index 0000000000..45f0e10664
--- /dev/null
+++ b/third_party/rust/jsparagus-emitter/src/expression_emitter.rs
@@ -0,0 +1,31 @@
+use crate::ast_emitter::AstEmitter;
+use crate::emitter::EmitError;
+
+pub struct ExpressionEmitter<F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub expr: F,
+}
+
+impl<F> ExpressionEmitter<F>
+where
+    F: Fn(&mut AstEmitter) -> Result<(), EmitError>,
+{
+    pub fn emit(self, emitter: &mut AstEmitter) -> Result<(), EmitError> {
+        //              [stack]
+
+        (self.expr)(emitter)?;
+        //              [stack] VAL
+
+        if emitter.options.no_script_rval {
+            emitter.emit.pop();
+        //          [stack]
+        } else {
+            emitter.emit.set_rval();
+            //          [stack]
+        }
+
+        Ok(())
+    }
+}