Add function return type check; Clean up

Cargo.toml

@@ -17,8 +17,16 @@ opt-level = 1
 opt-level = 3
 
 [dependencies]
+ansi_term = "0.12.1"
 clap = { version = "4.4.4", features = ["derive"] }
 csv = "1.2.2"
+egui = "0.24.1"
+eframe = { version = "0.24.1", default-features = false, features = [
+    "accesskit",
+    "default_fonts", 
+    "glow",   
+    "persistence",
+] }
 libc = "0.2.148"
 log = "0.4.20"
 rand = "0.8.5"
@@ -29,13 +37,6 @@ serde = { version = "1.0.188", features = ["derive"] }
 serde_json = "1.0.107"
 toml = "0.8.1"
 tree-sitter = "0.20.10"
-egui = "0.24.1"
-eframe = { version = "0.24.1", default-features = false, features = [
-    "default_fonts", # Embed the default egui fonts.
-    "glow",          # Use the glow rendering backend. Alternative: "wgpu".
-    "persistence",   # Enable restoring app state when restarting the app.
-] }
-ansi_term = "0.12.1"
 
 [target.'cfg(not(target_arch = "wasm32"))'.dependencies]
 env_logger = "0.10"

src/abstract_tree/block.rs

@@ -100,6 +100,10 @@ impl AbstractTree for Block {
     }
 
     fn expected_type(&self, context: &Map) -> Result<Type> {
-        self.statements.last().unwrap().expected_type(context)
+        if let Some(statement) = self.statements.last() {
+            statement.expected_type(context)
+        } else {
+            Ok(Type::None)
+        }
     }
 }

src/abstract_tree/value_node.rs

@@ -69,6 +69,8 @@ impl AbstractTree for ValueNode {
                 let body_node = child.child(child_count - 1).unwrap();
                 let body = Block::from_syntax_node(source, body_node, &function_context)?;
 
+                return_type.inner().check(&body.expected_type(context)?)?;
+
                 let r#type = Type::Function {
                     parameter_types,
                     return_type: Box::new(return_type.take_inner()),

src/bin/gui/app.rs

@@ -1,7 +1,7 @@
 use std::{fs::read_to_string, path::PathBuf};
 
 use dust_lang::{Interpreter, Map, Result, Value};
-use egui::{Align, Layout};
+use egui::{Align, Color32, Layout, RichText};
 use serde::{Deserialize, Serialize};
 
 #[derive(Deserialize, Serialize)]
@@ -36,6 +36,8 @@ impl App {
             }
         }
 
+        cc.egui_ctx.set_zoom_factor(1.2);
+
         if path.is_file() {
             create_app(path)
         } else {
@@ -62,6 +64,7 @@ impl eframe::App for App {
                 if ui.button("Quit").clicked() {
                     ctx.send_viewport_cmd(egui::ViewportCommand::Close);
                 }
+
                 ui.add_space(16.0);
 
                 egui::widgets::global_dark_light_mode_buttons(ui);
@@ -90,13 +93,44 @@ impl eframe::App for App {
                     ui.code_editor(&mut self.source);
                 });
 
-                let output_text = match &self.output {
-                    Ok(value) => value.to_string(),
-                    Err(error) => error.to_string(),
-                };
+                match &self.output {
+                    Ok(value) => {
+                        display_value(value, ui);
+                    }
+                    Err(error) => {
+                        ui.label(error.to_string());
+                    }
+                }
+            });
+        });
+    }
+}
 
-                ui.label(output_text);
-            });
+fn display_value(value: &Value, ui: &mut egui::Ui) {
+    match value {
+        Value::List(list) => {
+            ui.collapsing("list", |ui| {
+                for value in list.items().iter() {
+                    display_value(value, ui);
+                }
             });
         }
+        Value::Map(_) => todo!(),
+        Value::Function(function) => {
+            ui.label(function.to_string());
+        }
+        Value::String(string) => {
+            ui.label(RichText::new(string).color(Color32::GREEN));
+        }
+        Value::Float(float) => {
+            ui.label(float.to_string());
+        }
+        Value::Integer(integer) => {
+            ui.label(RichText::new(integer.to_string()).color(Color32::BLUE));
+        }
+        Value::Boolean(boolean) => {
+            ui.label(RichText::new(boolean.to_string()).color(Color32::RED));
+        }
+        Value::Option(_) => todo!(),
+    }
 }

src/value/map.rs

@@ -1,8 +1,13 @@
-use serde::{ser::SerializeMap, Deserialize, Deserializer, Serialize};
+use serde::{
+    de::{MapAccess, Visitor},
+    ser::SerializeMap,
+    Deserialize, Serialize,
+};
 use std::{
     cmp::Ordering,
     collections::BTreeMap,
     fmt::{self, Display, Formatter},
+    marker::PhantomData,
     sync::{Arc, RwLock, RwLockReadGuard},
 };
 
@@ -132,11 +137,46 @@ impl Serialize for Map {
     }
 }
 
-impl<'de> Deserialize<'de> for Map {
-    fn deserialize<D>(_deserializer: D) -> std::result::Result<Self, D::Error>
+struct MapVisitor {
+    marker: PhantomData<fn() -> Map>,
+}
+
+impl MapVisitor {
+    fn new() -> Self {
+        MapVisitor {
+            marker: PhantomData,
+        }
+    }
+}
+
+impl<'de> Visitor<'de> for MapVisitor {
+    type Value = Map;
+
+    fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
+        formatter.write_str("Any valid whale data.")
+    }
+
+    fn visit_map<M>(self, mut access: M) -> std::result::Result<Map, M::Error>
     where
-        D: Deserializer<'de>,
+        M: MapAccess<'de>,
     {
-        todo!()
+        let map = Map::new();
+
+        {
+            while let Some((key, value)) = access.next_entry::<String, Value>()? {
+                map.set(key, value, None).unwrap();
+            }
+        }
+
+        Ok(map)
+    }
+}
+
+impl<'de> Deserialize<'de> for Map {
+    fn deserialize<D>(deserializer: D) -> std::result::Result<Self, D::Error>
+    where
+        D: serde::Deserializer<'de>,
+    {
+        deserializer.deserialize_any(MapVisitor::new())
     }
 }

src/value/mod.rs

@@ -614,7 +614,7 @@ impl<'de> Visitor<'de> for ValueVisitor {
     type Value = Value;
 
     fn expecting(&self, formatter: &mut Formatter) -> fmt::Result {
-        formatter.write_str("Any valid whale data.")
+        formatter.write_str("Dust-compatible data format.")
     }
 
     fn visit_bool<E>(self, v: bool) -> std::result::Result<Self::Value, E>
@@ -776,11 +776,9 @@ impl<'de> Visitor<'de> for ValueVisitor {
     where
         D: serde::Deserializer<'de>,
     {
-        let _ = deserializer;
-        Err(serde::de::Error::invalid_type(
-            serde::de::Unexpected::Option,
-            &self,
-        ))
+        Ok(Value::Option(Some(Box::new(Value::deserialize(
+            deserializer,
+        )?))))
     }
 
     fn visit_unit<E>(self) -> std::result::Result<Self::Value, E>
@@ -820,11 +818,9 @@ impl<'de> Visitor<'de> for ValueVisitor {
     {
         let map = Map::new();
 
-        {
         while let Some((key, value)) = access.next_entry::<String, Value>()? {
             map.set(key, value, None).unwrap();
         }
-        }
 
         Ok(Value::Map(map))
     }