From a16571acf286b4c7609fb3a8af4406b843597e21 Mon Sep 17 00:00:00 2001
From: me <me@alloca.space>
Date: Wed, 17 Dec 2025 01:01:56 +0200
Subject: [PATCH] assign

---
 src/ast/types.rs           |  1 -
 src/interpret/interpret.rs | 25 ++++++++++++++++++++++---
 src/interpret/types.rs     | 27 +++++++++++++++++----------
 3 files changed, 39 insertions(+), 14 deletions(-)

diff --git a/src/ast/types.rs b/src/ast/types.rs
index e693840..5119c01 100644
--- a/src/ast/types.rs
+++ b/src/ast/types.rs
@@ -39,7 +39,6 @@ pub enum Expr {
 #[derive(PartialEq, PartialOrd, Debug, Clone)]
 pub enum Op {
     Assign,
-    Dot,
     //	Equals,
 }
 
diff --git a/src/interpret/interpret.rs b/src/interpret/interpret.rs
index c4057fa..48cd8c0 100644
--- a/src/interpret/interpret.rs
+++ b/src/interpret/interpret.rs
@@ -116,7 +116,7 @@ fn eval_expr(expr_env: &Env, state: &mut State, expr: &ast::Expr) -> Result<ast:
 
                     for (arg, e) in func.args.into_iter().zip(args.iter()) {
                         let evalled = eval_expr(&closure_env, state, e)?;
-                        closure_env.0.insert(arg.name, evalled);
+                        closure_env.insert(arg.name, evalled);
                     }
                     eval_expr(&closure_env, state, &func.body)
                 }
@@ -131,7 +131,26 @@ fn eval_expr(expr_env: &Env, state: &mut State, expr: &ast::Expr) -> Result<ast:
             }
             _ => Ok(v.clone()),
         },
-        ast::Expr::Op { .. } => todo!("Implement bin op"),
+        ast::Expr::Op { lhs, rhs, op } => match op {
+            ast::Op::Assign => match &**lhs {
+                ast::Expr::Var(name) => {
+                    let rhs = eval_expr(expr_env, state, rhs)?;
+                    state
+                        .envs
+                        .get_mut(&expr_env.name)
+                        .unwrap()
+                        .insert(name.clone(), rhs);
+                    eval_expr(expr_env, state, &ast::UNIT)
+                }
+                // access via labels
+                _ => todo!(),
+            },
+            _ => {
+                let _lhs = eval_expr(expr_env, state, lhs)?;
+                let _rhs = eval_expr(expr_env, state, rhs)?;
+                todo!()
+            }
+        },
     }
 }
 
@@ -140,7 +159,7 @@ fn defs_to_env(
     env_name: &ast::EnvName,
     envs: &mut Envs,
 ) -> Result<(), Error> {
-    let mut env = Env::new();
+    let mut env = Env::new(env_name.clone());
 
     for def in defs {
         let (name, closure) = match def {
diff --git a/src/interpret/types.rs b/src/interpret/types.rs
index 1d13a63..73c59c8 100644
--- a/src/interpret/types.rs
+++ b/src/interpret/types.rs
@@ -71,24 +71,26 @@ impl State {
 }
 
 #[derive(PartialEq, Debug, Clone)]
-pub struct Env(pub BTreeMap<ast::Name, ast::Value>);
-impl Default for Env {
-    fn default() -> Env {
-        Env::new()
-    }
+pub struct Env {
+    env: BTreeMap<ast::Name, ast::Value>,
+    pub name: ast::EnvName,
 }
+
 impl Env {
-    pub fn new() -> Env {
-        Env(BTreeMap::new())
+    pub fn new(name: ast::EnvName) -> Env {
+        Env {
+            env: BTreeMap::new(),
+            name,
+        }
     }
     pub fn get(&self, name: &ast::Name) -> Result<&ast::Value, Error> {
-        self.0.get(name).ok_or(Error::NameNotFound(name.clone()))
+        self.env.get(name).ok_or(Error::NameNotFound(name.clone()))
     }
     pub fn insert(&mut self, name: ast::Name, value: ast::Value) {
-        self.0.insert(name.clone(), value);
+        self.env.insert(name.clone(), value);
     }
     pub fn insert_nodup(&mut self, name: &ast::Name, value: ast::Value) -> Result<(), Error> {
-        if self.0.insert(name.clone(), value).is_some() {
+        if self.env.insert(name.clone(), value).is_some() {
             Err(Error::DuplicateNames(name.clone()))
         } else {
             Ok(())
@@ -105,6 +107,11 @@ impl Envs {
             .get(env_name)
             .ok_or(Error::EnvNotFound(env_name.clone()))
     }
+    pub fn get_mut(&mut self, env_name: &ast::EnvName) -> Result<&mut Env, Error> {
+        self.0
+            .get_mut(env_name)
+            .ok_or(Error::EnvNotFound(env_name.clone()))
+    }
     pub fn insert(&mut self, name: &ast::EnvName, env: Env) -> Result<(), Error> {
         if self.0.insert(name.clone(), env).is_some() {
             Err(Error::DuplicateEnvNames(name.clone()))