Add more errors

src/abstract_tree/expression.rs

@@ -23,7 +23,11 @@ impl<'src> AbstractTree for Expression<'src> {
     }
 
     fn validate(&self, _context: &Context) -> Result<(), ValidationError> {
-        todo!()
+        match self {
+            Expression::Identifier(identifier) => identifier.validate(_context),
+            Expression::Logic(logic) => logic.validate(_context),
+            Expression::Value(value_node) => value_node.validate(_context),
+        }
     }
 
     fn run(self, context: &Context) -> Result<Value, RuntimeError> {

src/abstract_tree/identifier.rs

@@ -1,4 +1,7 @@
-use std::sync::Arc;
+use std::{
+    fmt::{self, Display, Formatter},
+    sync::Arc,
+};
 
 use crate::{
     context::Context,
@@ -22,18 +25,31 @@ impl Identifier {
 }
 
 impl AbstractTree for Identifier {
-    fn expected_type(&self, _context: &Context) -> Result<Type, ValidationError> {
-        todo!()
+    fn expected_type(&self, context: &Context) -> Result<Type, ValidationError> {
+        if let Some(value) = context.get(self)? {
+            Ok(value.r#type())
+        } else {
+            Err(ValidationError::VariableNotFound(self.clone()))
+        }
     }
 
-    fn validate(&self, _context: &Context) -> Result<(), ValidationError> {
-        todo!()
+    fn validate(&self, context: &Context) -> Result<(), ValidationError> {
+        if let Some(_) = context.get(self)? {
+            Ok(())
+        } else {
+            Err(ValidationError::VariableNotFound(self.clone()))
+        }
     }
 
-    fn run(self, _context: &Context) -> Result<Value, RuntimeError> {
-        todo!()
-        // let value = context.get(&self)?.unwrap_or_else(Value::none).clone();
+    fn run(self, context: &Context) -> Result<Value, RuntimeError> {
+        let value = context.get(&self)?.unwrap_or_else(Value::none).clone();
 
-        // Ok(value)
+        Ok(value)
+    }
+}
+
+impl Display for Identifier {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        write!(f, "{}", self.0)
     }
 }

src/abstract_tree/statement.rs

@@ -24,7 +24,12 @@ impl<'src> AbstractTree for Statement<'src> {
     }
 
     fn validate(&self, _context: &Context) -> Result<(), ValidationError> {
-        todo!()
+        match self {
+            Statement::Assignment(assignment) => assignment.validate(_context),
+            Statement::Block(_) => todo!(),
+            Statement::Expression(expression) => expression.validate(_context),
+            Statement::Loop(_) => todo!(),
+        }
     }
 
     fn run(self, _context: &Context) -> Result<Value, RuntimeError> {

src/error.rs

@@ -3,14 +3,26 @@ use std::sync::PoisonError;
 use ariadne::{Label, Report, ReportKind};
 use chumsky::{prelude::Rich, span::SimpleSpan};
 
-use crate::{abstract_tree::Type, lexer::Token};
+use crate::{
+    abstract_tree::{Identifier, Type},
+    lexer::Token,
+};
 
 #[derive(Debug, PartialEq)]
 pub enum Error {
-    Parse { expected: String, span: SimpleSpan },
-    Lex { expected: String, span: SimpleSpan },
+    Parse {
+        expected: String,
+        span: SimpleSpan,
+    },
+    Lex {
+        expected: String,
+        span: SimpleSpan,
+    },
     Runtime(RuntimeError),
-    Validation(ValidationError),
+    Validation {
+        error: ValidationError,
+        span: SimpleSpan,
+    },
 }
 
 impl From<Rich<'_, char>> for Error {
@@ -60,6 +72,7 @@ pub enum ValidationError {
     ExpectedBoolean,
     RwLockPoison(RwLockPoisonError),
     TypeCheck(TypeCheckError),
+    VariableNotFound(Identifier),
 }
 
 impl From<RwLockPoisonError> for ValidationError {
@@ -110,7 +123,18 @@ pub fn create_report<'a>(errors: &'a [Error]) -> Report<'a> {
                 );
             }
             Error::Runtime(_) => todo!(),
-            Error::Validation(_) => todo!(),
+            Error::Validation { error, span } => match error {
+                ValidationError::ExpectedBoolean => todo!(),
+                ValidationError::RwLockPoison(_) => todo!(),
+                ValidationError::TypeCheck(_) => todo!(),
+                ValidationError::VariableNotFound(identifier) => {
+                    report =
+                        report
+                            .with_label(Label::new(span.start..span.end).with_message(format!(
+                                "The variable {identifier} does not exist."
+                            )));
+                }
+            },
         }
     }
 

src/lib.rs

@@ -26,12 +26,14 @@ impl Interpreter {
         let statements = parse(&tokens)?;
         let errors = statements
             .iter()
-            .filter_map(|(statement, _span)| {
-                if let Some(error) = statement.validate(&self.context).err() {
-                    Some(Error::Validation(error))
-                } else {
-                    None
-                }
+            .filter_map(|(statement, span)| {
+                statement
+                    .validate(&self.context)
+                    .map_err(|validation_error| Error::Validation {
+                        error: validation_error,
+                        span: span.clone(),
+                    })
+                    .err()
             })
             .collect::<Vec<Error>>();
 

src/value.rs

@@ -6,7 +6,10 @@ use std::{
     sync::{Arc, OnceLock},
 };
 
-use crate::{abstract_tree::Identifier, error::ValidationError};
+use crate::{
+    abstract_tree::{Identifier, Type},
+    error::ValidationError,
+};
 
 pub static NONE: OnceLock<Value> = OnceLock::new();
 
@@ -63,6 +66,27 @@ impl Value {
         Value(Arc::new(ValueInner::Enum(name, variant)))
     }
 
+    pub fn r#type(&self) -> Type {
+        match self.0.as_ref() {
+            ValueInner::Boolean(_) => Type::Boolean,
+            ValueInner::Float(_) => Type::Float,
+            ValueInner::Integer(_) => Type::Integer,
+            ValueInner::List(values) => {
+                let mut types = Vec::with_capacity(values.len());
+
+                for value in values {
+                    types.push(value.r#type());
+                }
+
+                Type::ListExact(types)
+            }
+            ValueInner::Map(_) => Type::Map,
+            ValueInner::Range(_) => Type::Range,
+            ValueInner::String(_) => Type::String,
+            ValueInner::Enum(name, _) => Type::Custom(name.clone()),
+        }
+    }
+
     pub fn as_boolean(&self) -> Result<bool, ValidationError> {
         if let ValueInner::Boolean(boolean) = self.0.as_ref() {
             return Ok(*boolean);