Implement specific map types

src/abstract_tree/map_node.rs

@@ -58,6 +58,10 @@ impl AbstractTree for MapNode {
     }
 
     fn expected_type(&self, _context: &Context) -> Result<Type, ValidationError> {
+        if self.properties.is_empty() {
+            return Ok(Type::Map(None));
+        }
+
         let mut type_map = BTreeMap::new();
 
         for (identifier, (statement, r#type_option)) in &self.properties {

src/abstract_tree/type.rs

@@ -9,7 +9,7 @@ use tree_sitter::Node as SyntaxNode;
 use crate::{
     built_in_types::BuiltInType,
     error::{RuntimeError, SyntaxError, ValidationError},
-    AbstractTree, Context, Format, Identifier, Value,
+    AbstractTree, Context, Format, Identifier, TypeSpecification, Value,
 };
 
 #[derive(Debug, Clone, Serialize, Deserialize, Eq, PartialEq, PartialOrd, Ord)]
@@ -78,7 +78,7 @@ impl Type {
             | (Type::String, Type::Collection)
             | (Type::Float, Type::Float)
             | (Type::Integer, Type::Integer)
-            | (Type::Map(_), Type::Map(_))
+            | (Type::Map(None), Type::Map(None))
             | (Type::Number, Type::Number)
             | (Type::Number, Type::Integer)
             | (Type::Number, Type::Float)
@@ -86,6 +86,7 @@ impl Type {
             | (Type::Float, Type::Number)
             | (Type::String, Type::String)
             | (Type::None, Type::None) => true,
+            (Type::Map(left_types), Type::Map(right_types)) => left_types == right_types,
             (
                 Type::Custom {
                     name: left_name,
@@ -165,6 +166,27 @@ impl AbstractTree for Type {
 
                 Type::custom(name, argument)
             }
+            "{" => {
+                let mut type_map = BTreeMap::new();
+                let mut previous_identifier = None;
+
+                for index in 1..node.child_count() - 1 {
+                    let child = node.child(index).unwrap();
+
+                    if let Some(identifier) = previous_identifier {
+                        let type_specification =
+                            TypeSpecification::from_syntax(child, _source, context)?;
+
+                        type_map.insert(identifier, type_specification.take_inner());
+                        previous_identifier = None;
+                    } else {
+                        previous_identifier =
+                            Some(Identifier::from_syntax(child, _source, context)?)
+                    }
+                }
+
+                Type::Map(Some(type_map))
+            }
             "[" => {
                 let item_type_node = node.child(1).unwrap();
                 let item_type = Type::from_syntax(item_type_node, _source, context)?;

src/error/syntax_error.rs

@@ -77,7 +77,18 @@ impl From<RwLockError> for SyntaxError {
 }
 
 impl Display for SyntaxError {
-    fn fmt(&self, _f: &mut Formatter<'_>) -> fmt::Result {
+    fn fmt(&self, f: &mut Formatter<'_>) -> fmt::Result {
-        todo!()
+        match self {
+            SyntaxError::InvalidSource { position } => write!(f, "Invalid syntax at {position:?}."),
+            SyntaxError::RwLock(_) => todo!(),
+            SyntaxError::UnexpectedSyntaxNode {
+                expected,
+                actual,
+                position,
+            } => write!(
+                f,
+                "Unexpected syntax node. Expected {expected} but got {actual} at {position:?}."
+            ),
+        }
     }
 }

src/value/mod.rs

@@ -95,6 +95,9 @@ impl Value {
                 }
             }
             Value::Map(map) => {
+                if map.inner().is_empty() {
+                    Type::Map(None)
+                } else {
                     let mut type_map = BTreeMap::new();
 
                     for (identifier, value) in map.inner() {
@@ -103,6 +106,7 @@ impl Value {
 
                     Type::Map(Some(type_map))
                 }
+            }
             Value::Function(function) => function.r#type().clone(),
             Value::String(_) => Type::String,
             Value::Float(_) => Type::Float,

tree-sitter-dust/corpus/types.txt

@@ -6,3 +6,25 @@ x <{ y <int> }> = { y = 2 }
 
 --------------------------------------------------------------------------------
 
+(root
+  (statement
+    (statement_kind
+      (assignment
+        (identifier)
+        (type_specification
+          (type
+            (identifier)
+            (type_specification
+              (type))))
+        (assignment_operator)
+        (statement
+          (statement_kind
+            (expression
+              (value
+                (map
+                  (identifier)
+                  (statement
+                    (statement_kind
+                      (expression
+                        (value
+                          (integer))))))))))))))

tree-sitter-dust/grammar.js

@@ -356,7 +356,6 @@ module.exports = grammar({
           'int',
           'map',
           seq(
-            'map',
             '{',
             repeat1(
               seq(

tree-sitter-dust/src/grammar.json

@@ -1079,10 +1079,6 @@
           {
             "type": "SEQ",
             "members": [
-              {
-                "type": "STRING",
-                "value": "map"
-              },
               {
                 "type": "STRING",
                 "value": "{"