Add structure errors

src/abstract_tree/type.rs

@@ -48,15 +48,10 @@ impl Type {
             | (Type::Map, Type::Map)
             | (Type::None, Type::None)
             | (Type::Range, Type::Range)
-            | (Type::String, Type::String) => Ok(()),
+            | (Type::String, Type::String) => return Ok(()),
             (Type::ListOf(left), Type::ListOf(right)) => {
                 if let Ok(()) = left.check(right) {
-                    Ok(())
-                } else {
-                    Err(TypeConflict {
-                        actual: left.as_ref().clone(),
-                        expected: right.as_ref().clone(),
-                    })
+                    return Ok(());
                 }
             }
             (Type::ListOf(list_of), Type::ListExact(list_exact)) => {
@@ -64,27 +59,50 @@ impl Type {
                     list_of.check(r#type)?;
                 }
 
-                Ok(())
+                return Ok(());
             }
             (Type::ListExact(list_exact), Type::ListOf(list_of)) => {
                 for r#type in list_exact {
                     r#type.check(&list_of)?;
                 }
 
-                Ok(())
+                return Ok(());
             }
             (Type::ListExact(left), Type::ListExact(right)) => {
                 for (left, right) in left.iter().zip(right.iter()) {
                     left.check(right)?;
                 }
 
-                Ok(())
+                return Ok(());
             }
-            _ => Err(TypeConflict {
+            (Type::Named(left), Type::Named(right)) => {
+                if left == right {
+                    return Ok(());
+                }
+            }
+            (
+                Type::Named(named),
+                Type::Structure {
+                    name: struct_name, ..
+                },
+            )
+            | (
+                Type::Structure {
+                    name: struct_name, ..
+                },
+                Type::Named(named),
+            ) => {
+                if named == struct_name {
+                    return Ok(());
+                }
+            }
+            _ => {}
+        }
+
+        Err(TypeConflict {
             actual: other.clone(),
             expected: self.clone(),
-            }),
-        }
+        })
     }
 }
 

src/abstract_tree/value_node.rs

@@ -1,5 +1,7 @@
 use std::{cmp::Ordering, collections::BTreeMap, ops::Range};
 
+use chumsky::container::Container;
+
 use crate::{
     context::Context,
     error::{RuntimeError, ValidationError},
@@ -63,7 +65,29 @@ impl AbstractNode for ValueNode {
                     .collect(),
                 return_type: Box::new(return_type.node.clone()),
             },
-            ValueNode::Structure { name, fields } => todo!(),
+            ValueNode::Structure {
+                name,
+                fields: expressions,
+            } => {
+                let mut types = Vec::with_capacity(expressions.len());
+
+                for (identifier, expression) in expressions {
+                    let r#type = expression.node.expected_type(_context)?;
+
+                    types.push((
+                        identifier.clone(),
+                        WithPosition {
+                            node: r#type,
+                            position: expression.position,
+                        },
+                    ));
+                }
+
+                Type::Structure {
+                    name: name.clone(),
+                    fields: types,
+                }
+            }
         };
 
         Ok(r#type)
@@ -114,12 +138,36 @@ impl AbstractNode for ValueNode {
                 })?;
         }
 
-        if let ValueNode::Structure { name, fields } = self {
-            let r#type = if let Some(r#type) = context.get_type(name)? {
-                r#type
+        if let ValueNode::Structure {
+            name,
+            fields: expressions,
+        } = self
+        {
+            let types = if let Some(r#type) = context.get_type(name)? {
+                if let Type::Structure {
+                    name,
+                    fields: types,
+                } = r#type
+                {
+                    types
+                } else {
+                    todo!()
+                }
             } else {
                 return Err(ValidationError::TypeNotFound(name.clone()));
             };
+
+            for ((_, expression), (_, expected_type)) in expressions.iter().zip(types.iter()) {
+                let actual_type = expression.node.expected_type(context)?;
+
+                expected_type.node.check(&actual_type).map_err(|conflict| {
+                    ValidationError::TypeCheck {
+                        conflict,
+                        actual_position: expression.position,
+                        expected_position: expected_type.position,
+                    }
+                })?
+            }
         }
 
         Ok(())

src/context.rs

@@ -73,7 +73,13 @@ impl Context {
     pub fn get_type(&self, identifier: &Identifier) -> Result<Option<Type>, ValidationError> {
         if let Some(value_data) = self.inner.read()?.get(identifier) {
             let r#type = match value_data {
-                ValueData::Type(r#type) => r#type.clone(),
+                ValueData::Type(r#type) => {
+                    if let Type::Named(name) = r#type {
+                        return self.get_type(name);
+                    }
+
+                    r#type.clone()
+                }
                 ValueData::Value(value) => value.r#type(self)?,
             };
 

src/error.rs

@@ -33,7 +33,7 @@ impl Error {
         let (mut builder, validation_error, error_position) = match self {
             Error::Parse { expected, span } => {
                 let message = if expected.is_empty() {
-                    "Invalid token.".to_string()
+                    "Invalid character.".to_string()
                 } else {
                     format!("Expected {expected}.")
                 };
@@ -77,7 +77,7 @@ impl Error {
             }
             Error::Runtime { error, position } => (
                 Report::build(
-                    ReportKind::Custom("Dust Error", Color::White),
+                    ReportKind::Custom("Runtime Error", Color::White),
                     "input",
                     position.1,
                 ),
@@ -90,10 +90,11 @@ impl Error {
             ),
             Error::Validation { error, position } => (
                 Report::build(
-                    ReportKind::Custom("Dust Error", Color::White),
+                    ReportKind::Custom("Validation Error", Color::White),
                     "input",
                     position.1,
-                ),
+                )
+                .with_note("This error was detected by the interpreter before running the code."),
                 Some(error),
                 position,
             ),
@@ -130,6 +131,8 @@ impl Error {
                 } => {
                     let TypeConflict { actual, expected } = conflict;
 
+                    builder = builder.with_message("A type conflict was found.");
+
                     builder.add_labels([
                         Label::new(("input", expected_postion.0..expected_postion.1)).with_message(
                             format!("Type {} established here.", expected.fg(type_color)),

src/parser.rs

@@ -106,7 +106,7 @@ pub fn parser<'src>() -> impl Parser<
             just(Token::Keyword("range")).to(Type::Range),
             just(Token::Keyword("str")).to(Type::String),
             just(Token::Keyword("list")).to(Type::List),
-            identifier.clone().map(|name| Type::Named(name)),
+            identifier.clone().map(|identifier| Type::Named(identifier)),
         ))
     })
     .map_with(|r#type, state| r#type.with_position(state.span()));

tests/structs.rs

@@ -1,4 +1,8 @@
-use dust_lang::{abstract_tree::Identifier, error::Error, *};
+use dust_lang::{
+    abstract_tree::{Identifier, Type},
+    error::{Error, TypeConflict, ValidationError},
+    *,
+};
 
 #[test]
 fn simple_structure() {
@@ -26,6 +30,34 @@ fn simple_structure() {
     )
 }
 
+#[test]
+fn field_type_error() {
+    assert_eq!(
+        interpret(
+            "
+                struct Foo {
+                    bar : int,
+                }
+
+                Foo {
+                    bar = 'hiya',
+                }
+            "
+        ),
+        Err(vec![Error::Validation {
+            error: ValidationError::TypeCheck {
+                conflict: TypeConflict {
+                    actual: Type::String,
+                    expected: Type::Integer
+                },
+                actual_position: (128, 134).into(),
+                expected_position: (56, 59).into()
+            },
+            position: (96, 166).into()
+        }])
+    )
+}
+
 #[test]
 fn nested_structure() {
     assert_eq!(