remove workflow

.github/workflows/notify-bot-updated.yml

@@ -1,19 +0,0 @@
-name: Trigger Bot Build
-
-on:
-  push:
-    branches:
-      - dev
-
-jobs:
-  trigger-bot-build:
-    runs-on: ubuntu-latest
-    steps:
-      - name: Send repository dispatch
-        env:
-          GITHUB_TOKEN: ${{ secrets.LAMM_TOKEN }}
-        run: |
-          curl -X POST -H "Accept: application/vnd.github.everest-preview+json" \
-          -H "Authorization: token $GITHUB_TOKEN" \
-          https://api.github.com/repos/minneelyyyy/bot/dispatches \
-          -d '{"event_type": "lamm-updated"}'

Cargo.lock

@@ -1,6 +1,6 @@
 # This file is automatically @generated by Cargo.
 # It is not intended for manual editing.
-version = 4
+version = 3
 
 [[package]]
 name = "aho-corasick"
@@ -13,7 +13,7 @@ dependencies = [
 
 [[package]]
 name = "lamm"
-version = "0.1.0"
+version = "0.4.0"
 dependencies = [
  "regex",
 ]
@@ -26,9 +26,9 @@ checksum = "78ca9ab1a0babb1e7d5695e3530886289c18cf2f87ec19a575a0abdce112e3a3"
 
 [[package]]
 name = "regex"
-version = "1.11.0"
+version = "1.11.1"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "38200e5ee88914975b69f657f0801b6f6dccafd44fd9326302a4aaeecfacb1d8"
+checksum = "b544ef1b4eac5dc2db33ea63606ae9ffcfac26c1416a2806ae0bf5f56b201191"
 dependencies = [
  "aho-corasick",
  "memchr",

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "lamm"
-version = "0.3.0"
+version = "0.4.0"
 edition = "2021"
 license = "MIT"
 description = "a simple, functional paradigm programming language which uses Polish notation"

README.md

@@ -64,12 +64,12 @@ You can introduce a variable to global scope using the `export` builtin function
 ```
 # A very useful constant
 = pi 3.1415926
-export ["pi"]
+export pi
 
 # Some more useful constants
 = e 2.71828
 = phi 1.6180339887
-export ["e" "phi"]
+export (e phi)
 ```
 
 ## Functions
@@ -77,43 +77,53 @@ export ["e" "phi"]
 All functions in Lamm are **scoped** similarly to variables. Functions are declared using the `:` operator, which can be extended with more `:` and `.` characters to let Lamm know how many arguments the function takes.
 
 ```
-: inc x + x 1
-	inc 24  # => 25
+: inc x
+	+ x 1
+(inc 24)  # => 25
 
-:. pythag a b sqrt + ** a 2.0 ** b 2.0
-	pythag 3 4  # => 5
+: sqrt x
+	** x 0.5
+
+:. pythag a b
+	(sqrt + ** a 2.0 ** b 2.0)
+(pythag 3 4)  # => 5
 
 :::::. ten'args a b c d e f g h i j
 	[a b c d e f g h i j]
 ```
 
 The parameter types and return type of functions can be declared using a special syntax unique to function and lambda definitions.
+Calling a function requires parenthises around the call.
 
 ```
 # Takes an x of `Any` type
-: inc x + x 1
-	inc 12  # => 13
+: inc x
+	+ x 1
+(inc 12)  # => 13
 
 # Takes an x of `Int` and returns an `Int`
-: inc ?. x Int -> Int + x 1
-	inc 9  # => 10
+: inc ?. x Int -> Int
+	+ x 1
+(inc 9)  # => 10
 ```
 
 The `?.` operator is unique to function declarations and is used to specify the type of an argument. There are also first class functions, here is the syntax for it.
 
 ```
 # Applies a function to any value
-:. apply : f x f x
-	apply \sqrt 9  # => 3
+:. apply : f x
+	(f x)
+(apply sqrt 9)  # => 3
 
 # Applies a function f which maps an Int to an Int to x
-:. apply'int ?: f Int -> Int ?. x Int -> Int f x
-	apply'int \sqrt 36  # => 6
+:. apply'int ?: f Int -> Int ?. x Int -> Int
+	(f x)
+(apply'int sqrt 36)  # => 6
 ```
 
-The `:` operator inside of a function prototype tells Lamm that this argument must be a function where every argument and it's return type are all `Any`. This means that `: f` is essentially syntactic sugar for `?: f Any -> Any`. Also, in order to pass a function to a function, you must use the `\` operator, which tells Lamm not to call the function.
+The `:` operator inside of a function prototype tells Lamm that this argument must be a function where every argument and it's return type are all `Any`. This means that `: f` is essentially syntactic sugar for `?: f Any -> Any`. You can pass a function with just it's identifier.
 
-And off course, `:` and `?:` in function prototypes can also be extended depending on the number of arguments the function must take.
+And of course, `:` and `?:` in function prototypes can also be extended depending on the number of arguments the function must take.
 
 ## Branching
 
@@ -172,27 +182,27 @@ Using these, you can build a lot of fundamental functional paradigm functions.
 ```
 :. map : f ?. x [] -> []
   ?? bool x
-		+ f head x map \f tail x
+    [+ (f head x) (map f tail x)
     empty
-map ;x ** x 2 [1 2 3 4 5 6 7 8 9 10]  # => [1 4 9 16 25 36 49 64 81 100]
+(map ;x ** x 2 [1 2 3 4 5 6 7 8 9 10])  # => [1 4 9 16 25 36 49 64 81 100]
 
 :: iterate : f i count -> []
   ?? > count 0
-		+ i iterate \f f i - count 1
+    [+ i (iterate f (f i) - count 1)
     empty
-iterate (+ 1) 0 10  # => [0 1 2 3 4 5 6 7 8 9]
+(iterate (+ 1) 0 10)  # => [0 1 2 3 4 5 6 7 8 9]
 
 :. take ?. n Int ?. x [] -> []
 	?? > n 0
-		+ head x take - n 1 tail x
+		[+ head x (take - n 1 tail x)
 		empty
-take 3 [1 2 3 4 5]  # => [1 2 3]
+(take 3 [1 2 3 4 5])  # => [1 2 3]
 
 :. take'while ?: pred Any -> Bool ?. x [] -> []
-	?? && bool x pred head x
-		+ head x take'while \pred tail x
+	?? && bool x (pred head x)
+		[+ head x (take'while pred tail x)
 		empty
-take'while (> 10) [1 3 5 7 9 11 13 15 16]  # => [1 3 5 7 9]
+(take'while (> 10) [1 3 5 7 9 11 13 15 16])  # => [1 3 5 7 9]
 ```
 
 ## Lambdas

TODO.md

@@ -9,14 +9,10 @@
 - tuples
 - `extern "C"` functions
 - modules (`import` function)
+- a standard library
 - structs
 - data types (need an IO object for stateful functions to return)
 - unpacking type parameters (`(x:xs)` in Haskell for example)
 - type variables in function parameters and data types
 - automatic Int to Float casting if a parameter expects a float
 - `[x..y]` array generators
-- `(+)` = `;.x y + x y`
-
-## Maybe Add
-
-- `/` for float division and `//` for integer division

src/error.rs

@@ -54,17 +54,21 @@ impl fmt::Display for Error {
 
             if let Some(code) = &self.code {
                 let mut lines = code.lines();
-                let linect = match lines.nth(*line) {
+                let linect = match lines.nth(*line - 1) {
                     Some(l) => l,
                     None => return Ok(()), // there should probably be an error if the line number is somehow out of range
                 };
 
-                write!(f, "\n| --> {filename}:{line}:{}\n| {linect}\n", loc.start)?;
+                let numspaces = " ".repeat((*line as f64).log10() as usize + 1);
+
+                write!(f, "\n --> {filename}:{line}:{}\n", loc.start)?;
+                write!(f, "{numspaces} |\n")?;
+                write!(f, "{line} | {linect}\n")?;
 
                 let spaces = " ".repeat(loc.start);
                 let pointers: String = loc.clone().map(|_| '^').collect();
 
-                write!(f, "|{spaces}{pointers}")?;
+                write!(f, "{numspaces} |{spaces}{pointers}")?;
 
                 if let Some(note) = &self.note {
                     write!(f, " {note}")?;

src/executor.rs

@@ -20,7 +20,7 @@ impl Executor {
         }
     }
 
-    pub(crate) fn values<I>(mut self, iter: I) -> impl Iterator<Item = Result<Value, Error>>
+    pub(crate) fn _values<I>(mut self, iter: I) -> impl Iterator<Item = Result<Value, Error>>
     where
         I: Iterator<Item = Result<ParseTree, Error>>
     {
@@ -46,6 +46,11 @@ impl Executor {
         self
     }
 
+    pub(crate) fn add_local_mut(&mut self, k: String, v: Arc<Mutex<Object>>) -> &mut Self {
+        self.locals.insert(k, v);
+        self
+    }
+
     fn _get_object(&self, ident: &String) -> Result<&Arc<Mutex<Object>>, Error> {
         self.locals.get(ident).or(self.globals.get(ident))
             .ok_or(Error::new(format!("undefined identifier {}", ident.clone())))
@@ -84,227 +89,217 @@ impl Executor {
         locals
     }
 
+    fn op_error(op: &Op, args: &[Value]) -> Error {
+        Error::new(format!("no overload of {op} matches the arguments {}",
+                           args.iter().map(|x| format!("{x}")).collect::<Vec<_>>().join(", ")))
+    }
+
     pub(crate) fn exec(&mut self, tree: ParseTree) -> Result<Value, Error> {
         match tree {
             ParseTree::Operator(op, args) => {
                 let args: Vec<Value> = args.into_iter()
                     .map(|x| self.exec(x)).collect::<Result<_, _>>()?;
 
-                match op {
-                    Op::Add => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Int(x + y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x + *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float(*x as f64 + y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x + y)),
-                        [Value::String(x), Value::String(y)] => Ok(Value::String(format!("{x}{y}"))),
-                        [Value::Array(xtype, x), Value::Array(ytype, y)] => {
+                match (&op, &args[..]) {
+                    (Op::Add, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Int(x + y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x + *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float(*x as f64 + y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x + y)),
+                        (Value::String(x), Value::String(y)) => Ok(Value::String(format!("{x}{y}"))),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Neg, [x]) => match x {
+                        Value::Int(x) => Ok(Value::Int(-x)),
+                        Value::Float(x) => Ok(Value::Float(-x)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Concat, [x, y]) => match (x, y) {
+                        (Value::Array(xtype, x), Value::Nil) => Ok(Value::Array(xtype.clone(), x.clone())),
+                        (Value::Nil, Value::Array(xtype, x)) => Ok(Value::Array(xtype.clone(), x.clone())),
+                        (Value::Array(xtype, x), Value::Array(ytype, y)) =>
                             if xtype != ytype {
-                                return Err(Error::new(format!("expected type {} but found {}", xtype, ytype)));
-                            }
-
+                                Err(Error::new(format!("expected type {} but found {}", xtype, ytype)))
+                            } else {
                                 Ok(Value::Array(xtype.clone(), [x.clone(), y.clone()].concat()))
                             },
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        [Value::Array(t, x), y] => {
-                            let ytype = y.get_type();
-
-                            if *t != ytype {
-                                return Err(Error::new(format!("expected type {} but found {}", t, ytype)));
-                            }
-
-                            // NOTE: use y's type instead of the arrays type.
-                            // an `empty` array has Any type, but any value will have a fixed type.
-                            // this converts the empty array into a typed array.
-                            Ok(Value::Array(ytype, [x.clone(), vec![y.clone()]].concat()))
+                        _ => Err(Self::op_error(&op, &args)),
                     },
-                        [x, Value::Array(t, y)] => {
+                    (Op::Prepend, [x, y]) => match (x, y) {
+                        (Value::Nil, Value::Array(xtype, x)) => Ok(Value::Array(xtype.clone(), x.clone())),
+                        (x, Value::Array(t, y)) => {
                             let xtype = x.get_type();
-
                             if *t != xtype {
-                                return Err(Error::new(format!("expected type {} but found {}", t, xtype)));
-                            }
-
-                            // NOTE: read above
+                                Err(Error::new(format!("expected type {} but found {}", t, xtype)))
+                            } else {
                                 Ok(Value::Array(xtype, [vec![x.clone()], y.clone()].concat()))
+                            }
                         },
-                        _ => Err(Error::new("todo: add".into())),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Append, [x, y]) => match (x, y) {
+                        (Value::Array(xtype, x), Value::Nil) => Ok(Value::Array(xtype.clone(), x.clone())),
+                        (Value::Array(t, y), x) => {
+                            let xtype = x.get_type();
+                            if *t != xtype {
+                                Err(Error::new(format!("expected type {} but found {}", t, xtype)))
+                            } else {
+                                Ok(Value::Array(xtype, [y.clone(), vec![x.clone()]].concat()))
                             }
-                    Op::Sub => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Int(x - y)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float(*x as f64 - y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x - *y as f64)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x - y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
+                        },
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Insert, [Value::Int(idx), x, Value::Array(t, y)]) => {
+                        let mut y = y.clone();
+                        let xtype = x.get_type();
+                        if *t != xtype {
+                            Err(Error::new(format!("expected type {} but found {}", t, xtype)))
+                        } else if *idx as usize > y.len() {
+                            Err(Error::new("attempt to insert out of array len".into()))
+                        } else {
+                            y.insert(*idx as usize, x.clone());
+                            Ok(Value::Array(t.clone(), y))
                         }
-                    Op::Mul => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Int(x * y)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float(*x as f64 * y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x * *y as f64)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x * y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Div => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Float(*x as f64 / *y as f64)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x / *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float(*x as f64 / y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x / y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::FloorDiv => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Int(x / y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Int(*x as i64 / y)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Int(x / *y as i64)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Int(*x as i64 / *y as i64)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Exp => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Float((*x as f64).powf(*y as f64))),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x.powf(*y as f64))),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float((*x as f64).powf(*y))),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x.powf(*y))),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: fsadfdsf".into())),
-                    }
-                    Op::Mod => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Int(x % y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Float(x % *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Float(*x as f64 % y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Float(x % y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::GreaterThan => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x > y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x > *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool(*x as f64 > *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x > y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::GreaterThanOrEqualTo => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x >= y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x >= *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool(*x as f64 >= *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x >= y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::LessThan => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x < y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x < *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool((*x as f64) < *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x < y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::LessThanOrEqualTo => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x <= y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x <= *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool(*x as f64 <= *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x <= y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::EqualTo => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x == y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x == *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool(*x as f64 == *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x == y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::NotEqualTo => match &args[..] {
-                        [Value::Int(x), Value::Int(y)] => Ok(Value::Bool(x != y)),
-                        [Value::Float(x), Value::Int(y)] => Ok(Value::Bool(*x != *y as f64)),
-                        [Value::Int(x), Value::Float(y)] => Ok(Value::Bool(*x as f64 != *y)),
-                        [Value::Float(x), Value::Float(y)] => Ok(Value::Bool(x != y)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Not => match &args[0] {
-                        Value::Bool(b) => Ok(Value::Bool(!b)),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Or => match &args[..] {
-                        [Value::Bool(x), Value::Bool(y)] => Ok(Value::Bool(*x || *y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::And => match &args[..] {
-                        [Value::Bool(x), Value::Bool(y)] => Ok(Value::Bool(*x && *y)),
-                        [Value::Nil, x] => Ok(x.clone()),
-                        [x, Value::Nil] => Ok(x.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Compose => match &args[..] {
-                        [_, v] => Ok(v.clone()),
-                        _ => Err(Error::new("todo: actual error output".into())),
-                    }
-                    Op::Head => match &args[0] {
-                        Value::Array(_, x) => Ok(x.first().ok_or(Error::new(format!("passed an empty array to head")))?.clone()),
-                        _ => Err(Error::new("head".into())),
-                    }
-                    Op::Tail => match &args[0] {
-                        Value::Array(t, x) => Ok(Value::Array(t.clone(), if x.len() > 0 { x[1..].to_vec() } else { vec![] })),
-                        _ => Err(Error::new("tail".into())),
-                    }
-                    Op::Init => match &args[0] {
-                        Value::Array(t, x) => Ok(Value::Array(t.clone(), if x.len() > 0 { x[..x.len() - 1].to_vec() } else { vec![] })),
-                        _ => Err(Error::new("init".into())),
-                    }
-                    Op::Fini => match &args[0] {
-                        Value::Array(_, x) => Ok(x.last().ok_or(Error::new(format!("passed an empty array to fini")))?.clone()),
-                        _ => Err(Error::new("fini".into())),
-                    }
-                    Op::Id => match &args[0] {
-                        x => Ok(x.clone()),
-                    }
-                    Op::IntCast => match &args[0] {
+                    },
+                    (Op::Sub, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Int(x - y)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float(*x as f64 - y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x - *y as f64)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x - y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Mul, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Int(x * y)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float(*x as f64 * y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x * *y as f64)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x * y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Div, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Float(*x as f64 / *y as f64)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x / *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float(*x as f64 / y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x / y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::FloorDiv, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Int(x / y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Int(*x as i64 / y)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Int(x / *y as i64)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Int(*x as i64 / *y as i64)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Exp, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Float((*x as f64).powf(*y as f64))),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x.powf(*y as f64))),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float((*x as f64).powf(*y))),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x.powf(*y))),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Mod, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Int(x % y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Float(x % *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Float(*x as f64 % y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Float(x % y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::GreaterThan, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x > y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x > *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool(*x as f64 > *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x > y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::GreaterThanOrEqualTo, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x >= y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x >= *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool(*x as f64 >= *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x >= y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::LessThan, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x < y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x < *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool((*x as f64) < *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x < y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::LessThanOrEqualTo, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x <= y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x <= *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool(*x as f64 <= *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x <= y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::EqualTo, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x == y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x == *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool(*x as f64 == *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x == y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::NotEqualTo, [x, y]) => match (x, y) {
+                        (Value::Int(x), Value::Int(y)) => Ok(Value::Bool(x != y)),
+                        (Value::Float(x), Value::Int(y)) => Ok(Value::Bool(*x != *y as f64)),
+                        (Value::Int(x), Value::Float(y)) => Ok(Value::Bool(*x as f64 != *y)),
+                        (Value::Float(x), Value::Float(y)) => Ok(Value::Bool(x != y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Not, [Value::Bool(b)]) => Ok(Value::Bool(!b)),
+                    (Op::Or, [x, y]) => match (x, y) {
+                        (Value::Bool(x), Value::Bool(y)) => Ok(Value::Bool(*x || *y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::And, [x, y]) => match (x, y) {
+                        (Value::Bool(x), Value::Bool(y)) => Ok(Value::Bool(*x && *y)),
+                        _ => Err(Self::op_error(&op, &args)),
+                    },
+                    (Op::Compose, [_, v]) => Ok(v.clone()),
+                    (Op::Head, [Value::Array(_, x)]) => Ok(x.first().ok_or(Error::new("passed an empty array to head".into()))?.clone()),
+                    (Op::Tail, [Value::Array(t, x)]) => Ok(Value::Array(t.clone(), if x.len() > 0 { x[1..].to_vec() } else { vec![] })),
+                    (Op::Init, [Value::Array(t, x)]) => Ok(Value::Array(t.clone(), if x.len() > 0 { x[..x.len() - 1].to_vec() } else { vec![] })),
+                    (Op::Fini, [Value::Array(_, x)]) => Ok(x.last().ok_or(Error::new("passed an empty array to fini".into()))?.clone()),
+                    (Op::Id, [x]) => Ok(x.clone()),
+                    (Op::IntCast, [x]) => match x {
                         Value::Int(x) => Ok(Value::Int(*x)),
                         Value::Float(x) => Ok(Value::Int(*x as i64)),
                         Value::Bool(x) => Ok(Value::Int(if *x { 1 } else { 0 })),
                         Value::String(x) => {
                             let r: i64 = x.parse().map_err(|_| Error::new(format!("failed to parse {} into {}", x, Type::Int)))?;
                             Ok(Value::Int(r))
-                        }
-                            x => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Int))),
-                    }
-                    Op::FloatCast => match &args[0] {
+                        },
+                        _ => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Int))),
+                    },
+                    (Op::FloatCast, [x]) => match x {
                         Value::Int(x) => Ok(Value::Float(*x as f64)),
                         Value::Float(x) => Ok(Value::Float(*x)),
                         Value::Bool(x) => Ok(Value::Float(if *x { 1.0 } else { 0.0 })),
                         Value::String(x) => {
                             let r: f64 = x.parse().map_err(|_| Error::new(format!("failed to parse {} into {}", x, Type::Float)))?;
                             Ok(Value::Float(r))
-                        }
-                        x => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Float))),
-                    }
-                    Op::BoolCast => match &args[0] {
+                        },
+                        _ => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Float))),
+                    },
+                    (Op::BoolCast, [x]) => match x {
                         Value::Int(x) => Ok(Value::Bool(*x != 0)),
                         Value::Float(x) => Ok(Value::Bool(*x != 0.0)),
                         Value::Bool(x) => Ok(Value::Bool(*x)),
                         Value::String(x) => Ok(Value::Bool(!x.is_empty())),
                         Value::Array(_, vec) => Ok(Value::Bool(!vec.is_empty())),
-                        x => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Bool))),
-                    }
-                    Op::StringCast => Ok(Value::String(format!("{}", &args[0]))),
-                    Op::Print => match &args[0] {
+                        _ => Err(Error::new(format!("no possible conversion from {} into {}", x, Type::Bool))),
+                    },
+                    (Op::StringCast, [x]) => Ok(Value::String(format!("{}", x))),
+                    (Op::Print, [x]) => match x {
                         Value::String(s) => {
                             println!("{s}");
                             Ok(Value::Nil)
                         }
-                        x => {
+                        _ => {
                             println!("{x}");
                             Ok(Value::Nil)
                         }
-                    }
-                    _ => unreachable!(),
+                    },
+                    _ => Err(Self::op_error(&op, &args)),
                 }
             }
             ParseTree::Equ(ident, body, scope) => {
@@ -314,10 +309,14 @@ impl Executor {
                     let value = self.exec(*body)?;
                     let g = self.globals.clone();
 
-                    Executor::new()
-                        .locals(self.locals.clone())
-                        .add_local(ident, Arc::new(Mutex::new(Object::value(value, g, self.locals.to_owned()))))
-                        .exec(*scope)
+                    let r = self.add_local_mut(
+                        ident.clone(),
+                        Arc::new(Mutex::new(Object::value(value, g, self.locals.to_owned()))))
+                        .exec(*scope);
+
+                    self.locals.remove(&ident);
+
+                    r
                 }
             },
             ParseTree::LazyEqu(ident, body, scope) => {
@@ -325,22 +324,27 @@ impl Executor {
                     Err(Error::new(format!("attempt to override value of variable {ident}")))
                 } else {
                     let g = self.globals.clone();
-                    Executor::new()
-                        .locals(self.locals.clone())
-                        .add_local(ident, Arc::new(Mutex::new(Object::variable(*body, g, self.locals.to_owned()))))
-                        .exec(*scope)
+                    let r = self.add_local_mut(ident.clone(), Arc::new(Mutex::new(Object::variable(*body, g, self.locals.to_owned()))))
+                        .exec(*scope);
+
+                    self.locals.remove(&ident);
+
+                    r
                 }
             },
             ParseTree::FunctionDefinition(func, scope) => {
+                let name = func.name().unwrap().to_string();
                 let g = self.globals.clone();
-                Executor::new()
-                    .locals(self.locals.clone())
-                    .add_local(func.name().unwrap().to_string(),
+                let r = self.add_local_mut(name.clone(),
                         Arc::new(Mutex::new(Object::function(
                             func
                                 .globals(g)
                                 .locals(self.locals.clone()), HashMap::new(), HashMap::new()))))
-                    .exec(*scope)
+                    .exec(*scope);
+
+                self.locals.remove(&name);
+
+                r
             },
             ParseTree::FunctionCall(ident, args) => {
                 let obj = self.get_object_mut(&ident)?;
@@ -406,13 +410,6 @@ impl Executor {
 
                 Ok(Value::Nil)
             }
-            ParseTree::NonCall(name) => {
-                let obj = self.get_object_mut(&name)?;
-
-                let v = obj.lock().unwrap().eval()?;
-
-                Ok(v)
-            }
             ParseTree::_Local(_idx) => todo!(),
             ParseTree::GeneratedFunction(function) => Ok(Value::Function(function.globals(self.globals.clone()).locals(self.locals.clone()))),
         }

src/function.rs

@@ -119,12 +119,6 @@ impl Function {
                 ParseTree::Value(_) => body,
                 ParseTree::Nop => body,
                 ParseTree::Export(_) => body,
-                ParseTree::NonCall(ref var) => if let Some(idx) =
-                    args.into_iter().position(|r| *r == *var) {
-                        Box::new(ParseTree::_Local(idx))
-                    } else {
-                        body
-                    }
                 ParseTree::GeneratedFunction(_) => todo!(),
             }
         }

src/lib.rs

@@ -196,7 +196,7 @@ impl<R: BufRead> CodeIter<R> {
             reader,
             code: String::new(),
             pos: 0,
-            line: 0,
+            line: 1,
             column: 0,
         }
     }
@@ -246,7 +246,7 @@ impl<R: BufRead> Iterator for CodeIter<R> {
                     self.column = 0;
                     self.pos += 1;
 
-                    None
+                    Some('\n')
                 },
                 c => {
                     self.column += 1;
@@ -305,27 +305,18 @@ impl<R: BufRead> Runtime<R> {
 
         self
     }
-}
 
-impl<R: BufRead> Iterator for Runtime<R> {
-    type Item = Result<Value, Error>;
+    pub fn add_globals<Globals: IntoIterator<Item = (String, Value)>>(self, globals: Globals) -> Self {
+        globals.into_iter().fold(self, |acc, (key, value)| acc.add_global(&key, value))
+    }
 
-    fn next(&mut self) -> Option<Self::Item> {
+    pub fn values(&self) -> impl Iterator<Item = Result<Value, Error>> + use<'_, R> {
         let tokenizer = Tokenizer::new(self.reader.clone());
+        let parser = Parser::new().add_globals(self.global_types.clone());
 
-        let tree = Parser::new()
-            .add_globals(self.global_types.clone())
-            .parse(&mut tokenizer.peekable());
-
-        let tree = match tree.map_err(|e| e
-            .code(self.code())
-            .file(self.filename.clone()))
-        {
-            Ok(Some(tree)) => tree,
-            Ok(None) => return None,
-            Err(e) => return Some(Err(e))
-        };
-
-        Some(Executor::new().add_globals(self.globals.clone()).exec(tree))
+        Executor::new()
+            .add_globals(self.globals.clone())
+            ._values(parser.trees(tokenizer.peekable()))
+                .map(|r| r.map_err(|e| e.code(self.code()).file(self.filename.clone())))
     }
 }

src/main.rs

@@ -3,7 +3,7 @@ use std::io::{self, BufReader};
 fn main() {
 	let runtime = lamm::Runtime::new(BufReader::new(io::stdin()), "<stdin>");
 
-	for value in runtime {
+	for value in runtime.values() {
 		match value {
 			Ok(v) => println!("=> {v}"),
 			Err(e) => eprintln!("error: {e}"),

src/parser.rs

@@ -1,10 +1,10 @@
-
 use super::{Value, Type, Function, FunctionType};
 use super::tokenizer::{Token, TokenType, Op};
 use super::error::Error;
 
 use std::collections::HashMap;
 use std::iter::Peekable;
+use std::cmp::Ordering;
 
 #[derive(Clone, Debug)]
 pub(crate) enum ParseTree {
@@ -29,7 +29,6 @@ pub(crate) enum ParseTree {
     GeneratedFunction(Function),
 
     Nop,
-    NonCall(String),
     Export(Vec<String>),
 }
 
@@ -67,20 +66,25 @@ impl Parser {
         items.into_iter().fold(self, |acc, (k, v)| acc.add_global(k, v))
     }
 
-    pub(crate) fn locals(mut self, locals: HashMap<String, Type>) -> Self {
-        self.locals = locals;
-        self
-    }
-
-    pub(crate) fn add_local(mut self, k: String, v: Type) -> Self {
+    pub(crate) fn _add_local(mut self, k: String, v: Type) -> Self {
         self.locals.insert(k, v);
         self
     }
 
-    pub(crate) fn _add_locals<Items: Iterator<Item = (String, Type)>>(mut self, items: Items) -> Self {
-        items.for_each(|(name, t)| {
+    pub(crate) fn _add_locals<Items: Iterator<Item = (String, Type)>>(self, items: Items) -> Self {
+        items.fold(self, |acc, (key, value)| acc._add_local(key, value))
+    }
+
+    fn add_local_mut(&mut self, k: String, v: Type) -> &mut Self {
+        self.locals.insert(k, v);
+        self
+    }
+
+    fn add_locals_mut<Items: IntoIterator<Item = (String, Type)>>(&mut self, items: Items) -> &mut Self {
+        for (name, t) in items {
             self.locals.insert(name, t);
-        });
+        }
+
         self
     }
 
@@ -105,6 +109,7 @@ impl Parser {
         let operators: HashMap<Op, FunctionType> = HashMap::from([
             (Op::Add, FunctionType(Box::new(Type::Any), vec![Type::Any, Type::Any])),
             (Op::Sub, FunctionType(Box::new(Type::Any), vec![Type::Any, Type::Any])),
+            (Op::Neg, FunctionType(Box::new(Type::Any), vec![Type::Any])),
             (Op::Mul, FunctionType(Box::new(Type::Any), vec![Type::Any, Type::Any])),
             (Op::Div, FunctionType(Box::new(Type::Float), vec![Type::Any, Type::Any])),
             (Op::FloorDiv, FunctionType(Box::new(Type::Int), vec![Type::Any, Type::Any])),
@@ -121,6 +126,10 @@ impl Parser {
             (Op::And, FunctionType(Box::new(Type::Bool), vec![Type::Bool, Type::Bool])),
             (Op::Or, FunctionType(Box::new(Type::Bool), vec![Type::Bool, Type::Bool])),
             (Op::Head, FunctionType(Box::new(Type::Any), vec![Type::Array(Box::new(Type::Any))])),
+            (Op::Concat, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Array(Box::new(Type::Any)), Type::Array(Box::new(Type::Any))])),
+            (Op::Prepend, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Any, Type::Array(Box::new(Type::Any))])),
+            (Op::Append, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Array(Box::new(Type::Any)), Type::Any])),
+            (Op::Insert, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Int, Type::Any, Type::Array(Box::new(Type::Any))])),
             (Op::Tail, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Array(Box::new(Type::Any))])),
             (Op::Init, FunctionType(Box::new(Type::Array(Box::new(Type::Any))), vec![Type::Array(Box::new(Type::Any))])),
             (Op::Fini, FunctionType(Box::new(Type::Any), vec![Type::Array(Box::new(Type::Any))])),
@@ -167,40 +176,7 @@ impl Parser {
 
         match token.token() {
             TokenType::Constant(c) => Ok(Some(ParseTree::Value(c))),
-            TokenType::Identifier(ident) => {
-                match self.get_object_type(&ident).ok_or(
-                        Error::new(format!("undefined identifier {ident}"))
-                            .location(token.line, token.location))? {
-                    Type::Function(f) => {
-                        let f = f.clone();
-                        let args = self.get_args(tokens, f.1.len())?;
-
-                        if args.len() < f.1.len() {
-                            let mut counter = 0;
-                            let func_args: Vec<Type> = f.1.iter().skip(args.len()).cloned().collect();
-                            let (names, types): (Vec<String>, Vec<Type>) = func_args
-                                .into_iter()
-                                .map(|t| {
-                                    counter += 1;
-                                    (format!("{counter}"), t)
-                                }).unzip();
-                            let function_type = FunctionType(f.0.clone(), types);
-
-                            Ok(Some(ParseTree::Value(Value::Function(Function::lambda(
-                                function_type,
-                                names.clone(),
-                                Box::new(ParseTree::FunctionCall(ident,
-                                    vec![
-                                        args,
-                                        names.into_iter().map(|x| ParseTree::Variable(x)).collect()
-                                    ].concat())))))))
-                        } else {
-                            Ok(Some(ParseTree::FunctionCall(ident, args)))
-                        }
-                    }
-                    _ => Ok(Some(ParseTree::Variable(ident))),
-                }
-            },
+            TokenType::Identifier(ident) => Ok(Some(ParseTree::Variable(ident))),
             TokenType::Operator(op) => match op {
                 Op::OpenArray => {
                     let mut depth = 1;
@@ -229,14 +205,12 @@ impl Parser {
                         .into_iter()
                         .peekable();
 
-                    let trees: Vec<ParseTree> = Parser::new()
-                        .locals(self.locals.to_owned())
-                        .trees(array_tokens)
+                    let trees: Vec<ParseTree> = self.clone().trees(array_tokens)
                         .collect::<Result<_, Error>>()?;
 
                     let tree = trees.into_iter().fold(
                         ParseTree::Value(Value::Array(Type::Any, vec![])),
-                        |acc, x| ParseTree::Operator(Op::Add, vec![acc, x.clone()]),
+                        |acc, x| ParseTree::Operator(Op::Append, vec![acc, x.clone()]),
                     );
 
                     Ok(Some(tree))
@@ -246,7 +220,7 @@ impl Parser {
 
                     // take tokens until we reach the end of this array
                     // if we don't collect them here it causes rust to overflow computing the types
-                    let array_tokens = tokens.by_ref().take_while(|t| match t {
+                    let tokens = tokens.by_ref().take_while(|t| match t {
                         Ok(t) => match t.token() {
                             TokenType::Operator(Op::OpenStatement) => {
                                 depth += 1;
@@ -261,17 +235,51 @@ impl Parser {
                         _ => true,
                     }).collect::<Result<Vec<_>, Error>>()?;
 
-                    let array_tokens = array_tokens
+                    let mut tokens = tokens
                         .into_iter()
                         .map(|t| Ok(t))
                         .collect::<Vec<Result<Token, Error>>>()
                         .into_iter()
                         .peekable();
 
-                    let trees: Vec<ParseTree> = Parser::new()
-                        .locals(self.locals.to_owned())
-                        .trees(array_tokens)
-                        .collect::<Result<_, Error>>()?;
+                    if let Some(Ok(Some(Type::Function(f)))) = tokens.peek()
+                        .map(|t| t.clone().and_then(|t| match t.token() {
+                            TokenType::Identifier(ident) =>
+                                Ok(Some(self.get_object_type(&ident).ok_or(
+                                    Error::new(format!("undefined identifier {ident}"))
+                                        .location(token.line, token.location))?)),
+                            _ => Ok(None),
+                        }))
+                    {
+                        let token = tokens.next().unwrap().unwrap();
+                        let params: Vec<ParseTree> = self.clone().trees(tokens).collect::<Result<_, Error>>()?;
+
+                        match params.len().cmp(&f.1.len()) {
+                            Ordering::Equal => Ok(Some(ParseTree::FunctionCall(token.lexeme, params))),
+                            Ordering::Greater => Err(Error::new(format!("too many arguments to {}", token.lexeme)).location(token.line, token.location)),
+                            Ordering::Less => {
+                                let mut counter = 0;
+                                let func_args: Vec<Type> = f.1.iter().skip(params.len()).cloned().collect();
+                                let (names, types): (Vec<String>, Vec<Type>) = func_args
+                                    .into_iter()
+                                    .map(|t| {
+                                        counter += 1;
+                                        (format!("{counter}"), t)
+                                    }).unzip();
+                                let function_type = FunctionType(f.0.clone(), types);
+    
+                                Ok(Some(ParseTree::Value(Value::Function(Function::lambda(
+                                    function_type,
+                                    names.clone(),
+                                    Box::new(ParseTree::FunctionCall(token.lexeme,
+                                        vec![
+                                            params,
+                                            names.into_iter().map(|x| ParseTree::Variable(x)).collect()
+                                        ].concat())))))))
+                            }
+                        }
+                    } else {
+                        let trees: Vec<ParseTree> = self.clone().trees(tokens).collect::<Result<_, Error>>()?;
 
                         let tree = trees.into_iter().fold(
                             ParseTree::Nop,
@@ -279,6 +287,7 @@ impl Parser {
                         );
 
                         Ok(Some(tree))
+                    }
                 },
                 Op::Equ => {
                     let token = tokens.next()
@@ -287,21 +296,24 @@ impl Parser {
                             .note("expected an identifier after this token".into()))??;
 
                     if let TokenType::Identifier(ident) = token.token() {
-                        let body = Box::new(self.parse(tokens)?.ok_or(Error::new(format!("the variable `{ident}` has no value"))
+                        let body = self.parse(tokens)?.ok_or(Error::new(format!("the variable `{ident}` has no value"))
                             .location(token.line, token.location.clone())
-                            .note("expected a value after this identifier".into()))?);
+                            .note("expected a value after this identifier".into()))?;
 
-                        let scope = Parser::new()
-                            .locals(self.locals.clone())
-                            .add_local(ident.clone(), Type::Any)
+                        let scope = self.add_local_mut(ident.clone(), Type::Any)
                             .parse(tokens)?
                             .ok_or(Error::new("variable declaration requires a scope defined after it".into())
                                 .location(token.line, token.location)
                                 .note(format!("this variable {ident} has no scope")))?;
                         
+                        // temporary fix: just remove the identifier
+                        // ignore errors removing, in the case that the symbol was already exported, it won't be present in locals
+                        // this comes down to a basic architectural error. globals need to stick to the parser while locals need to be scoped.
+                        self.locals.remove(&ident);
+
                         Ok(Some(ParseTree::Equ(
                             ident.clone(),
-                            body,
+                            Box::new(body),
                             Box::new(scope))
                         ))
                     } else {
@@ -310,7 +322,7 @@ impl Parser {
                 },
                 Op::LazyEqu => {
                     let token = tokens.next()
-                        .ok_or(Error::new("no identifier given for = expression".into())
+                        .ok_or(Error::new("no identifier given for . expression".into())
                             .location(token.line, token.location)
                             .note("expected an identifier after this token".into()))??;
 
@@ -319,14 +331,16 @@ impl Parser {
                             .location(token.line, token.location.clone())
                             .note("expected a value after this identifier".into()))?);
 
-                        let scope = Parser::new()
-                            .locals(self.locals.clone())
-                            .add_local(ident.clone(), Type::Any)
+                        let scope = self.add_local_mut(ident.clone(), Type::Any)
                             .parse(tokens)?
                             .ok_or(Error::new("variable declaration requires a scope defined after it".into())
                                 .location(token.line, token.location)
                                 .note(format!("this variable {ident} has no scope")))?;
                         
+                        // temporary fix: just remove the identifier
+                        // ignore errors removing, in the case that the symbol was already exported, it won't be present in locals
+                        self.locals.remove(&ident);
+
                         Ok(Some(ParseTree::LazyEqu(
                             ident.clone(),
                             body,
@@ -339,22 +353,18 @@ impl Parser {
                 Op::FunctionDefine(arg_count) => {
                     let f = self.parse_function_definition(tokens, arg_count)?;
 
-                    let scope = Parser::new()
-                        .locals(self.locals.clone())
-                        .add_local(f.name().unwrap().to_string(), Type::Function(f.get_type()))
+                    let scope = self.add_local_mut(f.name().unwrap().to_string(), Type::Function(f.get_type()))
                         .parse(tokens)?
                             .ok_or(Error::new("function declaration requires a scope defined after it".into())
                             .location(token.line, token.location)
                             .note(format!("this function {} has no scope", f.name().unwrap())))?;
                     
+                    self.locals.remove(f.name().unwrap());
+
                     Ok(Some(ParseTree::FunctionDefinition( f.clone(), Box::new(scope))))
                 },
                 Op::LambdaDefine(arg_count) => Ok(Some(ParseTree::LambdaDefinition(self.parse_lambda_definition(tokens, arg_count)?))),
                 Op::Empty => Ok(Some(ParseTree::Value(Value::Array(Type::Any, vec![])))),
-                Op::NonCall => {
-                    let name = Self::get_identifier(tokens.next())?;
-                    Ok(Some(ParseTree::NonCall(name)))
-                },
                 Op::If => {
                     let cond = self.parse(tokens)?
                         .ok_or(Error::new("? statement requires a condition".into())
@@ -379,7 +389,37 @@ impl Parser {
                     Ok(Some(ParseTree::IfElse(
                         Box::new(cond), Box::new(truebranch), Box::new(falsebranch))))
                 },
-                Op::Export => todo!(),
+                Op::Export => {
+                    let token = tokens.next()
+                        .ok_or(Error::new("export expects an identifer or multiple inside of parens".into())
+                            .location(token.line, token.location.clone()))??;
+
+                    let names = match token.token() {
+                        TokenType::Identifier(ident) => vec![ident],
+                        TokenType::Operator(Op::OpenStatement) => {
+                            tokens
+                                .take_while(|token| !matches!(token.clone().map(|token| token.token()), Ok(TokenType::Operator(Op::CloseStatement))))
+                                .map(|token| token.map(|token| match token.token() {
+                                    TokenType::Identifier(ident) => Ok(ident),
+                                    _ => Err(Error::new(format!("expected an identifier")).location(token.line, token.location))
+                                })?)
+                                .collect::<Result<_, Error>>()?
+                        }
+                        _ => return Err(Error::new("export expects one or more identifiers".into()).location(token.line, token.location)),
+                    };
+
+                    for name in &names {
+                        let (name, t) = self.locals.remove_entry(name)
+                            .ok_or(
+                                Error::new(format!("attempt to export {name}, which is not in local scope"))
+                                    .location(token.line, token.location.clone())
+                            )?;
+
+                        self.globals.insert(name, t);
+                    }
+
+                    Ok(Some(ParseTree::Export(names)))
+                },
                 op => self.parse_operator(tokens, op).map(|x| Some(x)),
             },
             _ => Err(Error::new(format!("the token {} was unexpected", token.lexeme)).location(token.line, token.location)),
@@ -396,8 +436,7 @@ impl Parser {
         }
 
         Ok(Function::lambda(t, args, Box::new(
-            Parser::new()
-                .locals(locals).parse(tokens)?.ok_or(Error::new("lambda requires a body".into()))?)))
+            self.clone().add_locals_mut(locals).parse(tokens)?.ok_or(Error::new("lambda requires a body".into()))?)))
     }
 
     fn parse_function_definition<I: Iterator<Item = Result<Token, Error>>>(&mut self, tokens: &mut Peekable<I>, arg_count: usize) -> Result<Function, Error> {
@@ -413,8 +452,7 @@ impl Parser {
         locals.insert(name.clone(), Type::Function(t.clone()));
 
         Ok(Function::named(&name, t, args, Box::new(
-            Parser::new()
-                .locals(locals).parse(tokens)?.ok_or(Error::new("function requires a body".into()))?)))
+            self.clone().add_locals_mut(locals).parse(tokens)?.ok_or(Error::new("function requires a body".into()))?)))
     }
 
     fn parse_function_declaration<I: Iterator<Item = Result<Token, Error>>>(

src/tokenizer.rs

@@ -1,4 +1,4 @@
-use std::collections::{VecDeque, HashMap};
+use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 
 use crate::{CodeIter, Type};
@@ -7,6 +7,8 @@ use crate::error::Error;
 use super::Value;
 use std::io::BufRead;
 use std::ops::Range;
+use std::fmt;
+use std::fmt::Formatter;
 
 #[derive(Debug, Clone, PartialEq, Eq, Hash)]
 pub enum Op {
@@ -17,6 +19,7 @@ pub enum Op {
     FloorDiv,
     Exp,
     Equ,
+    Neg,
     Mod,
     LazyEqu,
     TypeDeclaration,
@@ -42,6 +45,10 @@ pub enum Op {
     Print,
     OpenArray,
     CloseArray,
+    Concat,
+    Prepend,
+    Append,
+    Insert,
     OpenStatement,
     CloseStatement,
     Empty,
@@ -52,7 +59,62 @@ pub enum Op {
     Init,
     Fini,
     Export,
-    NonCall,
+}
+
+impl fmt::Display for Op {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
+        let s = match self {
+            Op::Add => "+",
+            Op::Sub => "-",
+            Op::Mul => "*",
+            Op::Div => "/",
+            Op::FloorDiv => "//",
+            Op::Exp => "**",
+            Op::Equ => "=",
+            Op::Neg => "_",
+            Op::Mod => "%",
+            Op::LazyEqu => ".",
+            Op::TypeDeclaration => "?.",
+            Op::FunctionDefine(_n) => ":",
+            Op::FunctionDeclare(_n) => "?:",
+            Op::LambdaDefine(_n) => ";",
+            Op::Arrow => "->",
+            Op::Compose => "~",
+            Op::Id => ",",
+            Op::If => "?",
+            Op::IfElse => "??",
+            Op::GreaterThan => ">",
+            Op::LessThan => "<",
+            Op::EqualTo => "==",
+            Op::NotEqualTo => "!=",
+            Op::GreaterThanOrEqualTo => ">=",
+            Op::LessThanOrEqualTo => ">=",
+            Op::Not => "!",
+            Op::IntCast => "int",
+            Op::FloatCast => "float",
+            Op::BoolCast => "bool",
+            Op::StringCast => "string",
+            Op::Print => "print",
+            Op::OpenArray => "[",
+            Op::CloseArray => "]",
+            Op::Concat => "++",
+            Op::Prepend => "[+",
+            Op::Append => "+]",
+            Op::Insert => "[+]",
+            Op::OpenStatement => "(",
+            Op::CloseStatement => ")",
+            Op::Empty => "empty",
+            Op::And => "&&",
+            Op::Or => "||",
+            Op::Head => "head",
+            Op::Tail => "tail",
+            Op::Init => "init",
+            Op::Fini => "fini",
+            Op::Export => "export",
+        };
+
+        write!(f, "{s}")
+    }
 }
 
 #[derive(Debug, Clone, PartialEq)]
@@ -83,7 +145,7 @@ impl TokenType {
             "fini" => TokenType::Operator(Op::Fini),
             "export" => TokenType::Operator(Op::Export),
 
-            // Types
+            // Built-in Types
             "Any" => TokenType::Type(Type::Any),
             "Int" => TokenType::Type(Type::Int),
             "Float" => TokenType::Type(Type::Float),
@@ -137,14 +199,12 @@ impl Token {
 #[derive(Clone)]
 pub(crate) struct Tokenizer<R: BufRead> {
     reader: Arc<Mutex<CodeIter<R>>>,
-    tokens: VecDeque<Token>,
 }
 
 impl<R: BufRead> Tokenizer<R> {
     pub fn new(reader: Arc<Mutex<CodeIter<R>>>) -> Self {
         Self {
             reader,
-            tokens: VecDeque::new(),
         }
     }
 
@@ -181,7 +241,7 @@ impl<R: BufRead> Tokenizer<R> {
     }
 
     /// Tokenizes more input and adds them to the internal queue
-    fn tokenize(&mut self) -> Result<(), Error> {
+    fn tokenize(&mut self) -> Result<Option<Token>, Error> {
         let operators: HashMap<&'static str, Op> = HashMap::from([
             ("+", Op::Add),
             ("-", Op::Sub),
@@ -191,6 +251,7 @@ impl<R: BufRead> Tokenizer<R> {
             ("**", Op::Exp),
             ("%", Op::Mod),
             ("=", Op::Equ),
+            ("_", Op::Neg),
             (".", Op::LazyEqu),
             ("?.", Op::TypeDeclaration),
             (":", Op::FunctionDefine(1)),
@@ -209,32 +270,33 @@ impl<R: BufRead> Tokenizer<R> {
             ("!=", Op::NotEqualTo),
             ("[", Op::OpenArray),
             ("]", Op::CloseArray),
+            ("++", Op::Concat),
+            ("[+", Op::Prepend),
+            ("+]", Op::Append),
+            ("[+]", Op::Insert),
             ("(", Op::OpenStatement),
             (")", Op::CloseStatement),
             ("!", Op::Not),
             ("&&", Op::And),
             ("||", Op::Or),
-            ("\\", Op::NonCall),
         ]);
 
         let c = if let Some(c) = self.next_char() {
             c
         } else {
-            return Ok(());
+            return Ok(None);
         };
 
         if c.is_alphanumeric() {
             let mut token = String::from(c);
 
-            while let Some(c) = self.next_char_if(|&c| c.is_alphanumeric() || c == '.' || c == '\'') {
+            while let Some(c) = self.next_char_if(|&c| c.is_alphanumeric() || c == '.' || c == '\'' || c == '_') {
                 token.push(c);
             }
 
             let (line, column) = self.getpos();
 
-            self.tokens.push_back(Token::new(TokenType::parse(&token)
-                .map_err(|e| e.location(line, column - token.len() + 1..column + 1))?, token.clone(), line, column - token.len() + 1));
-            self.tokenize()
+            Ok(Some(Token::new(TokenType::parse(&token).map_err(|e| e.location(line, column - token.len() + 1..column + 1))?, token.clone(), line, column - token.len() + 1)))
         } else if c == '#' {
             while self.next_char_if(|&c| c != '\n').is_some() {}
             self.tokenize()
@@ -244,10 +306,15 @@ impl<R: BufRead> Tokenizer<R> {
 
             while let Some(c) = self.next_char() {
                 match c {
-                    '"' => break,
+                    '"' => {
+                        let (line, col) = self.getpos();
+
+                        return Ok(Some(Token::new(TokenType::Constant(
+                            Value::String(token.clone())), token, line, col)));
+                    }
                     '\n' => return Err(
                         Error::new("Unclosed string literal".into())
-                            .location(line, col..self.getpos().1)
+                            .location(line, col..col+token.len()+1)
                             .note("newlines are not allowed in string literals (try \\n)".into())),
                     '\\' => match self.next_char() {
                         Some('\\') => token.push('\\'),
@@ -258,20 +325,16 @@ impl<R: BufRead> Tokenizer<R> {
                         Some(c) => token.push(c),
                         None => return Err(
                             Error::new("Unclosed string literal".into())
-                                .location(line, col..self.getpos().1)
+                                .location(line, col..token.len()+1)
                                 .note("end of file found before \"".into())),
                     }
                     _ => token.push(c),
-                }
+                };
             }
 
-            let (line, col) = self.getpos();
-
-            self.tokens.push_back(
-                Token::new(TokenType::Constant(
-                    Value::String(token.clone())), token, line, col));
-
-            self.tokenize()
+            Err(Error::new("Unclosed string literal".into())
+                .location(line, col..self.getpos().1+1)
+                .note("end of file found before \"".into()))
         } else if operators.keys().any(|x| x.starts_with(c)) {
             let mut token = String::from(c);
 
@@ -309,9 +372,7 @@ impl<R: BufRead> Tokenizer<R> {
 
                             let token = Token::new(t, token, line, col);
                             
-                            self.tokens.push_back(token);
-
-                            break;
+                            return Ok(Some(token));
                         } else {
                             let next = match self.next_char_if(is_expected) {
                                 Some(c) => c,
@@ -345,8 +406,7 @@ impl<R: BufRead> Tokenizer<R> {
     
                                 let token = Token::new(t, token, line, col);
 
-                                self.tokens.push_back(token);
-                                break;
+                                return Ok(Some(token))
                             }
                         };
 
@@ -354,16 +414,13 @@ impl<R: BufRead> Tokenizer<R> {
                     }
                 }
             }
-
-            self.tokenize()
         } else if c.is_whitespace() {
             self.tokenize()
         } else {
             let (line, col) = self.getpos();
 
-            return Err(
-                Error::new(format!("an unidentified character {c} was found"))
-                    .location(line, col - 1..col));
+            Err(Error::new(format!("an unidentified character {c} was found"))
+                    .location(line, col..col+1))
         }
     }
 }
@@ -372,16 +429,7 @@ impl<R: BufRead> Iterator for Tokenizer<R> {
     type Item = Result<Token, Error>;
 
     fn next(&mut self) -> Option<Self::Item> {
-        if let Some(token) = self.tokens.pop_front() {
-            return Some(Ok(token));
-        } else {
-            match self.tokenize() {
-                Ok(_) => (),
-                Err(e) => return Some(Err(e)),
-            };
-
-            self.next()
-        }
+        self.tokenize().transpose()
     }
 }
 
@@ -391,13 +439,11 @@ mod tests {
     use std::io::Cursor;
 
     #[test]
-    fn a() {
-        let program = ": f a * 12 a f 12";
+    fn meow() {
+        let program = "[+] 0 1 [2 3]";
 
-        let tokenizer = Tokenizer::new(Arc::new(Mutex::new(CodeIter::new(Cursor::new(program)))));
+        let tokens: Vec<_> = Tokenizer::new(Arc::new(Mutex::new(CodeIter::new(Cursor::new(program))))).collect();
 
-        let t: Vec<_> = tokenizer.collect();
-
-        println!("{t:#?}");
+        println!("{tokens:#?}");
     }
 }