Move set point spec validation into Regulator

app-proto/src/assembly.rs

@@ -120,6 +120,19 @@ pub struct Regulator {
     pub set_point_spec: Signal<String>
 }
 
+impl Regulator {
+    pub fn try_specify_set_point(&self, spec: String) -> bool {
+        match spec.parse::<f64>() {
+            Err(_) if !spec.is_empty() => false,
+            set_pt => {
+                self.set_point.set(set_pt.ok());
+                self.set_point_spec.set(spec);
+                true
+            }
+        }
+    }
+}
+
 // the velocity is expressed in uniform coordinates
 pub struct ElementMotion<'a> {
     pub key: ElementKey,