feat: added signal to replace primitive result

Author: raphael-goetz

src/context/context.rs

@@ -0,0 +1,3 @@
+pub struct Context {
+    
+}

src/context/mod.rs

@@ -1,3 +1,6 @@
+pub mod signal;
+pub mod context;
+
 use crate::error::RuntimeError;
 use std::{
     collections::{HashMap, VecDeque},

src/context/signal.rs

@@ -0,0 +1,22 @@
+use tucana::shared::Value;
+use crate::error::RuntimeError;
+
+#[derive(Debug)]
+pub enum Signal {
+    Success(Value),
+    Failure(RuntimeError),
+    Return(Value),
+    Stop
+}
+
+impl PartialEq for Signal {
+    fn eq(&self, other: &Self) -> bool {
+        matches!(
+            (self, other),
+            (Signal::Success(_), Signal::Success(_))
+                | (Signal::Failure(_), Signal::Failure(_))
+                | (Signal::Return(_), Signal::Return(_))
+                | (Signal::Stop, Signal::Stop)
+        )
+    }
+}

src/registry/mod.rs

@@ -1,8 +1,9 @@
-use crate::{context::Context, error::RuntimeError};
+use crate::{context::Context};
 use std::collections::HashMap;
 use tucana::shared::Value;
+use crate::context::signal::Signal;
 
-pub type HandlerFn = fn(&[Value], &mut Context) -> Result<Value, RuntimeError>;
+pub type HandlerFn = fn(&[Value], &mut Context) -> Signal;
 
 /// Holds all registered handlers.
 pub struct FunctionStore {