Add type argument syntax

src/abstract_tree/as.rs

@@ -37,9 +37,9 @@ impl AbstractTree for As {
     fn validate(&self, _source: &str, context: &Context) -> Result<(), ValidationError> {
         let initial_type = self.expression.expected_type(context)?;
 
-        if let Type::List(item_type) = &self.r#type {
+        if let Type::ListOf(item_type) = &self.r#type {
             match &initial_type {
-                Type::List(expected_item_type) => {
+                Type::ListOf(expected_item_type) => {
                     if !item_type.accepts(&expected_item_type) {
                         return Err(ValidationError::TypeCheck {
                             expected: self.r#type.clone(),
@@ -77,7 +77,7 @@ impl AbstractTree for As {
 
     fn run(&self, source: &str, context: &Context) -> Result<Value, RuntimeError> {
         let value = self.expression.run(source, context)?;
-        let converted_value = if let Type::List(_) = self.r#type {
+        let converted_value = if let Type::ListOf(_) = self.r#type {
             match value {
                 Value::List(list) => Value::List(list),
                 Value::String(string) => {

src/abstract_tree/assignment.rs

@@ -78,7 +78,7 @@ impl AbstractTree for Assignment {
                     }
                 }
                 AssignmentOperator::PlusEqual => {
-                    if let Type::List(expected) = type_specification.inner() {
+                    if let Type::ListOf(expected) = type_specification.inner() {
                         let actual = self.identifier.expected_type(context)?;
 
                         if !expected.accepts(&actual) {
@@ -107,7 +107,7 @@ impl AbstractTree for Assignment {
             match self.operator {
                 AssignmentOperator::Equal => {}
                 AssignmentOperator::PlusEqual => {
-                    if let Type::List(expected) = self.identifier.expected_type(context)? {
+                    if let Type::ListOf(expected) = self.identifier.expected_type(context)? {
                         let actual = self.statement.expected_type(context)?;
 
                         if !expected.accepts(&actual) {

src/abstract_tree/enum_defintion.rs

@@ -9,11 +9,11 @@ use crate::{
 #[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
 pub struct EnumDefinition {
     identifier: Identifier,
-    variants: Vec<(Identifier, Option<Type>)>,
+    variants: Vec<(Identifier, Vec<Type>)>,
 }
 
 impl EnumDefinition {
-    pub fn new(identifier: Identifier, variants: Vec<(Identifier, Option<Type>)>) -> Self {
+    pub fn new(identifier: Identifier, variants: Vec<(Identifier, Vec<Type>)>) -> Self {
         Self {
             identifier,
             variants,
@@ -27,6 +27,10 @@ impl EnumDefinition {
     pub fn identifier(&self) -> &Identifier {
         &self.identifier
     }
+
+    pub fn variants(&self) -> &Vec<(Identifier, Vec<Type>)> {
+        &self.variants
+    }
 }
 
 impl AbstractTree for EnumDefinition {
@@ -37,21 +41,25 @@ impl AbstractTree for EnumDefinition {
         let identifier = Identifier::from_syntax(identifier_node, source, context)?;
 
         let mut variants = Vec::new();
-        let mut current_identifier = None;
+        let mut current_identifier: Option<Identifier> = None;
+        let mut types = Vec::new();
 
         for index in 3..node.child_count() - 1 {
             let child = node.child(index).unwrap();
 
             if child.kind() == "identifier" {
+                if let Some(identifier) = &current_identifier {
+                    variants.push((identifier.clone(), types));
+                }
+
                 current_identifier = Some(Identifier::from_syntax(child, source, context)?);
+                types = Vec::new();
             }
 
-            if let Some(identifier) = &current_identifier {
+            if child.kind() == "type" {
-                if child.kind() == "type" {
+                let r#type = Type::from_syntax(child, source, context)?;
-                    let r#type = Type::from_syntax(child, source, context)?;
 
-                    variants.push((identifier.clone(), Some(r#type)));
+                types.push(r#type);
-                }
             }
         }
 
@@ -65,13 +73,14 @@ impl AbstractTree for EnumDefinition {
         Ok(Type::None)
     }
 
-    fn validate(&self, _source: &str, _context: &Context) -> Result<(), ValidationError> {
+    fn validate(&self, _source: &str, context: &Context) -> Result<(), ValidationError> {
+        context.set_definition(self.identifier.clone(), TypeDefinition::Enum(self.clone()))?;
+        self.identifier.validate(_source, context)?;
+
         Ok(())
     }
 
-    fn run(&self, _source: &str, context: &Context) -> Result<Value, RuntimeError> {
+    fn run(&self, _source: &str, _context: &Context) -> Result<Value, RuntimeError> {
-        context.set_definition(self.identifier.clone(), TypeDefinition::Enum(self.clone()))?;
-
         Ok(Value::none())
     }
 }

src/abstract_tree/for.rs

@@ -66,7 +66,7 @@ impl AbstractTree for For {
         self.collection.validate(_source, context)?;
 
         let collection_type = self.collection.expected_type(context)?;
-        let item_type = if let Type::List(item_type) = collection_type {
+        let item_type = if let Type::ListOf(item_type) = collection_type {
             item_type.as_ref().clone()
         } else if let Type::Range = collection_type {
             Type::Integer

src/abstract_tree/index.rs

@@ -35,7 +35,7 @@ impl AbstractTree for Index {
 
     fn expected_type(&self, context: &Context) -> Result<Type, ValidationError> {
         match self.collection.expected_type(context)? {
-            Type::List(item_type) => Ok(*item_type.clone()),
+            Type::ListOf(item_type) => Ok(*item_type.clone()),
             Type::Map(map_types_option) => {
                 if let (Some(map_type), IndexExpression::Identifier(identifier)) =
                     (map_types_option, &self.index)

src/abstract_tree/type.rs

@@ -19,7 +19,7 @@ pub enum Type {
     Collection,
     Custom {
         name: Identifier,
-        argument: Option<Box<Type>>,
+        arguments: Vec<Type>,
     },
     Float,
     Function {
@@ -27,20 +27,19 @@ pub enum Type {
         return_type: Box<Type>,
     },
     Integer,
-    List(Box<Type>),
+    List,
+    ListOf(Box<Type>),
+    ListExact(Vec<Type>),
     Map(Option<BTreeMap<Identifier, Type>>),
+    None,
     Number,
     String,
     Range,
-    None,
 }
 
 impl Type {
-    pub fn custom(name: Identifier, argument: Option<Type>) -> Self {
+    pub fn custom(name: Identifier, arguments: Vec<Type>) -> Self {
-        Type::Custom {
+        Type::Custom { name, arguments }
-            name,
-            argument: argument.map(|r#type| Box::new(r#type)),
-        }
     }
 
     pub fn option(inner_type: Option<Type>) -> Self {
@@ -48,7 +47,7 @@ impl Type {
     }
 
     pub fn list(item_type: Type) -> Self {
-        Type::List(Box::new(item_type))
+        Type::ListOf(Box::new(item_type))
     }
 
     pub fn function(parameter_types: Vec<Type>, return_type: Type) -> Self {
@@ -70,14 +69,15 @@ impl Type {
             | (_, Type::Any)
             | (Type::Boolean, Type::Boolean)
             | (Type::Collection, Type::Collection)
-            | (Type::Collection, Type::List(_))
+            | (Type::Collection, Type::ListOf(_))
-            | (Type::List(_), Type::Collection)
+            | (Type::ListOf(_), Type::Collection)
             | (Type::Collection, Type::Map(_))
             | (Type::Map(_), Type::Collection)
             | (Type::Collection, Type::String)
             | (Type::String, Type::Collection)
             | (Type::Float, Type::Float)
             | (Type::Integer, Type::Integer)
+            | (Type::List, Type::List)
             | (Type::Map(None), Type::Map(None))
             | (Type::Number, Type::Number)
             | (Type::Number, Type::Integer)
@@ -90,22 +90,25 @@ impl Type {
             (
                 Type::Custom {
                     name: left_name,
-                    argument: left_argument,
+                    arguments: left_arguments,
                 },
                 Type::Custom {
                     name: right_name,
-                    argument: right_argument,
+                    arguments: right_arguments,
                 },
-            ) => {
+            ) => left_name == right_name && left_arguments == right_arguments,
-                if left_name != right_name {
+            (Type::ListOf(self_item_type), Type::ListOf(other_item_type)) => {
-                    false
-                } else {
-                    left_argument == right_argument
-                }
-            }
-            (Type::List(self_item_type), Type::List(other_item_type)) => {
                 self_item_type.accepts(&other_item_type)
             }
+            (Type::ListExact(self_types), Type::ListExact(other_types)) => {
+                for (left, right) in self_types.iter().zip(other_types.iter()) {
+                    if !left.accepts(right) {
+                        return false;
+                    }
+                }
+
+                true
+            }
             (
                 Type::Function {
                     parameter_types: self_parameter_types,
@@ -137,7 +140,7 @@ impl Type {
     }
 
     pub fn is_list(&self) -> bool {
-        matches!(self, Type::List(_))
+        matches!(self, Type::ListOf(_))
     }
 
     pub fn is_map(&self) -> bool {
@@ -158,13 +161,19 @@ impl AbstractTree for Type {
         let r#type = match type_node.kind() {
             "identifier" => {
                 let name = Identifier::from_syntax(type_node, _source, context)?;
-                let argument = if let Some(child) = node.child(2) {
+                let mut arguments = Vec::new();
-                    Some(Type::from_syntax(child, _source, context)?)
-                } else {
-                    None
-                };
 
-                Type::custom(name, argument)
+                for index in 2..node.child_count() - 1 {
+                    let child = node.child(index).unwrap();
+
+                    if child.is_named() {
+                        let r#type = Type::from_syntax(child, _source, context)?;
+
+                        arguments.push(r#type);
+                    }
+                }
+
+                Type::custom(name, arguments)
             }
             "{" => {
                 let mut type_map = BTreeMap::new();
@@ -191,7 +200,7 @@ impl AbstractTree for Type {
                 let item_type_node = node.child(1).unwrap();
                 let item_type = Type::from_syntax(item_type_node, _source, context)?;
 
-                Type::List(Box::new(item_type))
+                Type::ListOf(Box::new(item_type))
             }
             "any" => Type::Any,
             "bool" => Type::Boolean,
@@ -261,7 +270,7 @@ impl Format for Type {
             Type::Collection => output.push_str("collection"),
             Type::Custom {
                 name: _,
-                argument: _,
+                arguments: _,
             } => todo!(),
             Type::Float => output.push_str("float"),
             Type::Function {
@@ -282,11 +291,13 @@ impl Format for Type {
                 return_type.format(output, indent_level);
             }
             Type::Integer => output.push_str("int"),
-            Type::List(item_type) => {
+            Type::List => todo!(),
+            Type::ListOf(item_type) => {
                 output.push('[');
                 item_type.format(output, indent_level);
                 output.push(']');
             }
+            Type::ListExact(_) => todo!(),
             Type::Map(_) => {
                 output.push_str("map");
             }
@@ -304,9 +315,19 @@ impl Display for Type {
             Type::Any => write!(f, "any"),
             Type::Boolean => write!(f, "bool"),
             Type::Collection => write!(f, "collection"),
-            Type::Custom { name, argument } => {
+            Type::Custom { name, arguments } => {
-                if let Some(argument) = argument {
+                if !arguments.is_empty() {
-                    write!(f, "{name}<{argument}>")
+                    write!(f, "<")?;
+
+                    for (index, r#type) in arguments.into_iter().enumerate() {
+                        if index == arguments.len() - 1 {
+                            write!(f, "{}", r#type)?;
+                        } else {
+                            write!(f, "{}, ", r#type)?;
+                        }
+                    }
+
+                    write!(f, ">")
                 } else {
                     write!(f, "{name}")
                 }
@@ -330,7 +351,21 @@ impl Display for Type {
                 write!(f, " -> {return_type}")
             }
             Type::Integer => write!(f, "int"),
-            Type::List(item_type) => write!(f, "[{item_type}]"),
+            Type::List => write!(f, "list"),
+            Type::ListOf(item_type) => write!(f, "[{item_type}]"),
+            Type::ListExact(types) => {
+                write!(f, "[")?;
+
+                for (index, r#type) in types.into_iter().enumerate() {
+                    if index == types.len() - 1 {
+                        write!(f, "{}", r#type)?;
+                    } else {
+                        write!(f, "{}, ", r#type)?;
+                    }
+                }
+
+                write!(f, "]")
+            }
             Type::Map(_) => write!(f, "map"),
             Type::Number => write!(f, "num"),
             Type::None => write!(f, "none"),

src/abstract_tree/value_node.rs

@@ -124,43 +124,47 @@ impl AbstractTree for ValueNode {
             ValueNode::Integer(_) => Type::Integer,
             ValueNode::String(_) => Type::String,
             ValueNode::List(expressions) => {
-                let mut previous_type = None;
+                let mut item_types = Vec::new();
 
                 for expression in expressions {
                     let expression_type = expression.expected_type(context)?;
 
-                    if let Some(previous) = previous_type {
+                    item_types.push(expression_type);
-                        if expression_type != previous {
-                            return Ok(Type::List(Box::new(Type::Any)));
-                        }
-                    }
-
-                    previous_type = Some(expression_type);
                 }
 
-                if let Some(previous) = previous_type {
+                Type::ListExact(item_types)
-                    Type::List(Box::new(previous))
-                } else {
-                    Type::List(Box::new(Type::Any))
-                }
             }
             ValueNode::Map(map_node) => map_node.expected_type(context)?,
             ValueNode::Struct { name, .. }  => {
-                Type::Custom { name: name.clone(), argument: None }
+                Type::custom(name.clone(), Vec::with_capacity(0))
             }
             ValueNode::Range(_) => Type::Range,
-            ValueNode::Enum { name, variant: _, expression } => {
+            ValueNode::Enum { name, variant, expression: _ } => {
-                if let Some(expression) = expression {
+                let types: Vec<Type> = if let Some(type_definition) = context.get_definition(name)? {
-                    Type::Custom {
+                    if let TypeDefinition::Enum(enum_definition) = type_definition {
-                        name: name.clone(),
+                        let types = enum_definition.variants().into_iter().find_map(|(identifier, types)| {
-                        argument: Some(Box::new(expression.expected_type(context)?))
+                            if identifier == variant {
+                                Some(types.clone())
+                            } else {
+                                None
+                            }
+                        });
+
+                        if let Some(types) = types {
+                            types 
+                        } else {
+                            return Err(ValidationError::VariableIdentifierNotFound(variant.clone()));
+                        }
+                         
+                    } else {
+                        return Err(ValidationError::ExpectedEnumDefintion { actual: type_definition.clone() });
                     }
                 } else {
-                    Type::Custom{
+                     return Err(ValidationError::VariableIdentifierNotFound(name.clone()));
-                        name: name.clone(),
+                };
-                        argument: None,
+
-                    }
+                Type::custom(name.clone(), types.clone())
-                }
+                
             },
         };
 

src/built_in_functions/mod.rs

@@ -73,13 +73,7 @@ impl Callable for BuiltInFunction {
 
     fn r#type(&self) -> Type {
         match self {
-            BuiltInFunction::AssertEqual => Type::function(
+            BuiltInFunction::AssertEqual => Type::function(vec![Type::Any, Type::Any], Type::None),
-                vec![Type::Any, Type::Any],
-                Type::Custom {
-                    name: Identifier::new("Result"),
-                    argument: None,
-                },
-            ),
             BuiltInFunction::Fs(fs_function) => fs_function.r#type(),
             BuiltInFunction::Json(json_function) => json_function.r#type(),
             BuiltInFunction::Length => Type::function(vec![Type::Collection], Type::Integer),

src/built_in_type_definitions.rs

@@ -33,8 +33,8 @@ impl BuiltInTypeDefinition {
                 let definition = TypeDefinition::Enum(EnumDefinition::new(
                     Identifier::new(self.name()),
                     vec![
-                        (Identifier::new("Some"), Some(Type::Any)),
+                        (Identifier::new("Some"), vec![Type::Any]),
-                        (Identifier::new("None"), None),
+                        (Identifier::new("None"), Vec::with_capacity(0)),
                     ],
                 ));
 
@@ -44,8 +44,8 @@ impl BuiltInTypeDefinition {
                 let definition = TypeDefinition::Enum(EnumDefinition::new(
                     Identifier::new(self.name()),
                     vec![
-                        (Identifier::new("Ok"), Some(Type::Any)),
+                        (Identifier::new("Ok"), vec![Type::Any]),
-                        (Identifier::new("Err"), Some(Type::Any)),
+                        (Identifier::new("Error"), vec![Type::Any]),
                     ],
                 ));
 

src/built_in_types.rs

@@ -19,15 +19,9 @@ impl BuiltInType {
         match self {
             BuiltInType::Option(content_type) => OPTION.get_or_init(|| {
                 if let Some(content_type) = content_type {
-                    Type::Custom {
+                    Type::custom(Identifier::new("Option"), vec![content_type.clone()])
-                        name: Identifier::new("Option"),
-                        argument: Some(Box::new(content_type.clone())),
-                    }
                 } else {
-                    Type::Custom {
+                    Type::custom(Identifier::new("Option"), Vec::with_capacity(0))
-                        name: Identifier::new("Option"),
-                        argument: None,
-                    }
                 }
             }),
         }

src/context/mod.rs

@@ -270,7 +270,7 @@ impl Context {
         let old_data = map.remove(&key);
 
         if let Some((_, old_counter)) = old_data {
-            map.insert(key, (ValueData::Value(value), old_counter.clone()));
+            map.insert(key, (ValueData::Value(value), old_counter));
         } else {
             map.insert(key, (ValueData::Value(value), UsageCounter::new()));
         }

src/error/mod.rs

@@ -16,7 +16,7 @@ use tree_sitter::LanguageError;
 
 use std::fmt::{self, Formatter};
 
-#[derive(PartialEq)]
+#[derive(Debug, PartialEq)]
 pub enum Error {
     Syntax(SyntaxError),
 
@@ -95,12 +95,6 @@ impl From<LanguageError> for Error {
 
 impl std::error::Error for Error {}
 
-impl fmt::Debug for Error {
-    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        write!(f, "{self}")
-    }
-}
-
 impl fmt::Display for Error {
     fn fmt(&self, f: &mut Formatter) -> fmt::Result {
         use Error::*;

src/value/mod.rs

@@ -74,25 +74,15 @@ impl Value {
     pub fn r#type(&self) -> Result<Type, RwLockError> {
         let r#type = match self {
             Value::List(list) => {
-                let mut previous_type = None;
+                let mut item_types = Vec::new();
 
                 for value in list.items()?.iter() {
-                    let value_type = value.r#type();
+                    let r#type = value.r#type()?;
 
-                    if let Some(previous) = &previous_type {
+                    item_types.push(r#type);
-                        if &value_type != previous {
-                            return Ok(Type::List(Box::new(Type::Any)));
-                        }
-                    }
-
-                    previous_type = Some(value_type);
                 }
 
-                if let Some(previous) = previous_type {
+                Type::ListExact(item_types)
-                    Type::List(Box::new(previous?))
-                } else {
-                    Type::List(Box::new(Type::Any))
-                }
             }
             Value::Map(map) => {
                 if map.inner().is_empty() {

tests/as.rs

@@ -24,7 +24,7 @@ fn string_as_list_error() {
         interpret("'foobar' as [float]"),
         Err(Error::Validation(ValidationError::ConversionImpossible {
             initial_type: Type::String,
-            target_type: Type::List(Box::new(Type::Float))
+            target_type: Type::ListOf(Box::new(Type::Float))
         }))
     )
 }
@@ -39,7 +39,7 @@ fn conversion_runtime_error() {
         interpret(&format!("json:parse('{JSON}') as [map]")),
         Err(Error::Runtime(RuntimeError::ConversionImpossible {
             from: json_value.r#type().unwrap(),
-            to: Type::List(Box::new(Type::Map(None))),
+            to: Type::ListOf(Box::new(Type::Map(None))),
             position: SourcePosition {
                 start_byte: 0,
                 end_byte: 33,

tests/built_in_type_definitions.rs

@@ -1,5 +1,26 @@
 use dust_lang::*;
 
+#[test]
+fn override_built_ins() {
+    assert_eq!(
+        interpret(
+            "
+            enum Option {
+                Some<str>
+                None
+            }
+            
+            my_option <Option> = Option::Some('foo')
+            "
+        ),
+        Ok(Value::Enum(EnumInstance::new(
+            Identifier::new("Option"),
+            Identifier::new("Some"),
+            Some(Value::String("foo".to_string())),
+        )))
+    );
+}
+
 #[test]
 fn option() {
     assert_eq!(
@@ -13,14 +34,12 @@ fn option() {
     assert_eq!(
         interpret(
             "
-            opt <Option<int>> = Option::Some(1);
+            Option::Some(1)
-
-            opt
             "
         ),
         Ok(Value::Enum(EnumInstance::new(
             Identifier::new("Option"),
-            Identifier::new("None"),
+            Identifier::new("Some"),
             Some(Value::Integer(1)),
         )))
     );
@@ -39,8 +58,7 @@ fn result() {
     assert_eq!(
         interpret(
             "
-            result <Result<int, str>> = Result::Error('uh-oh!')
+            Result::Error('uh-oh!')
-            result
             "
         ),
         Ok(Value::Enum(EnumInstance::new(

tests/built_in_values.rs

@@ -1,4 +1,4 @@
-use dust_lang::*;
+use dust_lang::{error::RuntimeError, *};
 
 #[test]
 fn args() {
@@ -23,10 +23,9 @@ fn assert_equal() {
     );
     assert_eq!(
         interpret("assert_equal(true, false)"),
-        Ok(Value::Enum(EnumInstance::new(
+        Err(Error::Runtime(RuntimeError::AssertEqualFailed {
-            Identifier::new("Result"),
+            left: true.into(),
-            Identifier::new("Error"),
+            right: false.into()
-            Some(Value::none()),
+        }))
-        )))
     );
 }

tree-sitter-dust/corpus/enums.txt

@@ -19,15 +19,12 @@ enum Foobar {
           (identifier))))))
 
 ================================================================================
-Nested Enum
+Enum with Arguments
 ================================================================================
 
-enum Foobar {
+enum Foobar<T, U> {
-  Foo(str),
+  Foo<T>,
-  Bar(enum BazBuff {
+  Bar<U>,
-    Baz,
-    Buff,
-  })
 }
 
 --------------------------------------------------------------------------------
@@ -38,15 +35,56 @@ enum Foobar {
       (type_definition
         (enum_definition
           (identifier)
+          (type_arguments
+            (type
+              (identifier))
+            (type
+              (identifier)))
           (identifier)
-          (type)
+          (type_arguments
+            (type
+              (identifier)))
           (identifier)
-          (type_definition
+          (type_arguments
-            (enum_definition
+            (type
-              (identifier)
-              (identifier)
               (identifier))))))))
 
+================================================================================
+Complex Enum
+================================================================================
+
+enum Foobar<T> {
+  Foo<Foo>,
+  Bar<int, float>,
+  Baz<Option<T>>
+}
+
+--------------------------------------------------------------------------------
+
+(root
+  (statement
+    (statement_kind
+      (type_definition
+        (enum_definition
+          (identifier)
+          (type_arguments
+            (type
+              (identifier)))
+          (identifier)
+          (type_arguments
+            (type
+              (identifier)))
+          (identifier)
+          (type_arguments
+            (type)
+            (type))
+          (identifier)
+          (type_arguments
+            (type
+              (identifier)
+              (type
+                (identifier)))))))))
+
 ================================================================================
 Simple Enum Instance
 ================================================================================

tree-sitter-dust/corpus/types.txt

@@ -28,3 +28,69 @@ x <{ y <int> }> = { y = 2 }
                       (expression
                         (value
                           (integer))))))))))))))
+
+================================================================================
+List Of
+================================================================================
+
+x <list<str>> = ['foo', 'bar', 'baz']
+
+--------------------------------------------------------------------------------
+
+(root
+  (statement
+    (statement_kind
+      (assignment
+        (identifier)
+        (type_specification
+          (type
+            (type)))
+        (assignment_operator)
+        (statement
+          (statement_kind
+            (expression
+              (value
+                (list
+                  (expression
+                    (value
+                      (string)))
+                  (expression
+                    (value
+                      (string)))
+                  (expression
+                    (value
+                      (string))))))))))))
+
+================================================================================
+Exact List
+================================================================================
+
+foo <[int, float, int]> = [1, 2.0, 3]
+
+--------------------------------------------------------------------------------
+
+(root
+  (statement
+    (statement_kind
+      (assignment
+        (identifier)
+        (type_specification
+          (type
+            (type)
+            (type)
+            (type)))
+        (assignment_operator)
+        (statement
+          (statement_kind
+            (expression
+              (value
+                (list
+                  (expression
+                    (value
+                      (integer)))
+                  (expression
+                    (value
+                      (float)))
+                  (expression
+                    (value
+                      (integer))))))))))))

tree-sitter-dust/grammar.js

@@ -354,21 +354,15 @@ module.exports = grammar({
           'collection',
           'float',
           'int',
+          'list',
           'map',
-          seq(
-            '{',
-            repeat1(
-              seq(
-                $.identifier,
-                $.type_specification,
-              ),
-            ),
-            '}',
-          ),
           'none',
           'num',
           'str',
+          // Custom type
           $.identifier,
+
+          // Custom type with arguments
           seq(
             $.identifier,
             '<',
@@ -380,7 +374,35 @@ module.exports = grammar({
             ),
             '>',
           ),
-          seq('[', $.type, ']'),
+
+          // Map with exact fields
+          seq(
+            '{',
+            repeat1(
+              seq(
+                $.identifier,
+                $.type_specification,
+              ),
+            ),
+            '}',
+          ),
+
+          // List of
+          seq('list', '<', $.type, '>'),
+
+          // Exact list
+          seq(
+            '[',
+            repeat(
+              seq(
+                $.type,
+                optional(','),
+              ),
+            ),
+            ']',
+          ),
+
+          // Function
           seq(
             '(',
             repeat(
@@ -447,27 +469,31 @@ module.exports = grammar({
         $.struct_definition,
       ),
 
+    type_arguments: $ =>
+      seq(
+        '<',
+        repeat1(
+          seq(
+            $.type,
+            optional(','),
+          ),
+        ),
+        '>',
+      ),
+
     enum_definition: $ =>
       prec.right(
         seq(
           'enum',
           $.identifier,
+          optional($.type_arguments),
           repeat(
             seq(
               '{',
               repeat1(
                 seq(
                   $.identifier,
-                  optional(
+                  optional($.type_arguments),
-                    seq(
-                      '(',
-                      choice(
-                        $.type,
-                        $.type_definition,
-                      ),
-                      ')',
-                    ),
-                  ),
                   optional(','),
                 ),
               ),

tree-sitter-dust/src/grammar.json

@@ -1074,36 +1074,11 @@
           },
           {
             "type": "STRING",
-            "value": "map"
+            "value": "list"
           },
           {
-            "type": "SEQ",
+            "type": "STRING",
-            "members": [
+            "value": "map"
-              {
-                "type": "STRING",
-                "value": "{"
-              },
-              {
-                "type": "REPEAT1",
-                "content": {
-                  "type": "SEQ",
-                  "members": [
-                    {
-                      "type": "SYMBOL",
-                      "name": "identifier"
-                    },
-                    {
-                      "type": "SYMBOL",
-                      "name": "type_specification"
-                    }
-                  ]
-                }
-              },
-              {
-                "type": "STRING",
-                "value": "}"
-              }
-            ]
           },
           {
             "type": "STRING",
@@ -1167,12 +1142,82 @@
             "members": [
               {
                 "type": "STRING",
-                "value": "["
+                "value": "{"
+              },
+              {
+                "type": "REPEAT1",
+                "content": {
+                  "type": "SEQ",
+                  "members": [
+                    {
+                      "type": "SYMBOL",
+                      "name": "identifier"
+                    },
+                    {
+                      "type": "SYMBOL",
+                      "name": "type_specification"
+                    }
+                  ]
+                }
+              },
+              {
+                "type": "STRING",
+                "value": "}"
+              }
+            ]
+          },
+          {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "STRING",
+                "value": "list"
+              },
+              {
+                "type": "STRING",
+                "value": "<"
               },
               {
                 "type": "SYMBOL",
                 "name": "type"
               },
+              {
+                "type": "STRING",
+                "value": ">"
+              }
+            ]
+          },
+          {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "STRING",
+                "value": "["
+              },
+              {
+                "type": "REPEAT",
+                "content": {
+                  "type": "SEQ",
+                  "members": [
+                    {
+                      "type": "SYMBOL",
+                      "name": "type"
+                    },
+                    {
+                      "type": "CHOICE",
+                      "members": [
+                        {
+                          "type": "STRING",
+                          "value": ","
+                        },
+                        {
+                          "type": "BLANK"
+                        }
+                      ]
+                    }
+                  ]
+                }
+              },
               {
                 "type": "STRING",
                 "value": "]"
@@ -1386,6 +1431,43 @@
         }
       ]
     },
+    "type_arguments": {
+      "type": "SEQ",
+      "members": [
+        {
+          "type": "STRING",
+          "value": "<"
+        },
+        {
+          "type": "REPEAT1",
+          "content": {
+            "type": "SEQ",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "type"
+              },
+              {
+                "type": "CHOICE",
+                "members": [
+                  {
+                    "type": "STRING",
+                    "value": ","
+                  },
+                  {
+                    "type": "BLANK"
+                  }
+                ]
+              }
+            ]
+          }
+        },
+        {
+          "type": "STRING",
+          "value": ">"
+        }
+      ]
+    },
     "enum_definition": {
       "type": "PREC_RIGHT",
       "value": 0,
@@ -1400,6 +1482,18 @@
             "type": "SYMBOL",
             "name": "identifier"
           },
+          {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "type_arguments"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          },
           {
             "type": "REPEAT",
             "content": {
@@ -1422,30 +1516,8 @@
                         "type": "CHOICE",
                         "members": [
                           {
-                            "type": "SEQ",
+                            "type": "SYMBOL",
-                            "members": [
+                            "name": "type_arguments"
-                              {
-                                "type": "STRING",
-                                "value": "("
-                              },
-                              {
-                                "type": "CHOICE",
-                                "members": [
-                                  {
-                                    "type": "SYMBOL",
-                                    "name": "type"
-                                  },
-                                  {
-                                    "type": "SYMBOL",
-                                    "name": "type_definition"
-                                  }
-                                ]
-                              },
-                              {
-                                "type": "STRING",
-                                "value": ")"
-                              }
-                            ]
                           },
                           {
                             "type": "BLANK"

tree-sitter-dust/src/node-types.json

@@ -141,11 +141,7 @@
           "named": true
         },
         {
-          "type": "type",
+          "type": "type_arguments",
-          "named": true
-        },
-        {
-          "type": "type_definition",
           "named": true
         }
       ]
@@ -738,6 +734,21 @@
       ]
     }
   },
+  {
+    "type": "type_arguments",
+    "named": true,
+    "fields": {},
+    "children": {
+      "multiple": true,
+      "required": true,
+      "types": [
+        {
+          "type": "type",
+          "named": true
+        }
+      ]
+    }
+  },
   {
     "type": "type_definition",
     "named": true,
@@ -1030,6 +1041,10 @@
     "type": "integer",
     "named": true
   },
+  {
+    "type": "list",
+    "named": false
+  },
   {
     "type": "map",
     "named": false