Clean up

dust-lang/src/abstract_tree/built_in_function.rs

@@ -1,4 +1,10 @@
-use std::{fs::read_to_string, io::stdin, thread::sleep, time::Duration};
+use std::{
+    fmt::{self, Display, Formatter},
+    fs::read_to_string,
+    io::stdin,
+    thread::sleep,
+    time::Duration,
+};
 
 use serde::{Deserialize, Serialize};
 use serde_json::from_str;
@@ -51,6 +57,21 @@ impl BuiltInFunction {
     }
 }
 
+impl Display for BuiltInFunction {
+    fn fmt(&self, f: &mut Formatter) -> fmt::Result {
+        let display = match self {
+            BuiltInFunction::Length => "__LENGTH__",
+            BuiltInFunction::ReadLine => "__READ_LINE__",
+            BuiltInFunction::ReadFile => "__READ_FILE__",
+            BuiltInFunction::Sleep => "__SLEEP__",
+            BuiltInFunction::WriteLine => "__WRITE_LINE__",
+            BuiltInFunction::JsonParse => "__JSON_PARSE__",
+        };
+
+        write!(f, "{display}")
+    }
+}
+
 trait FunctionLogic {
     fn r#type() -> Type;
     fn call(context: &Context, manage_memory: bool) -> Result<Option<Value>, RuntimeError>;

dust-lang/src/abstract_tree/expression.rs

@@ -40,8 +40,6 @@ impl Expression {
 
 impl AbstractNode for Expression {
     fn define_types(&self, _context: &Context) -> Result<(), ValidationError> {
-        log::trace!("Defining types for expression at {}", self.position());
-
         match self {
             Expression::As(inner) => inner.node.define_types(_context),
             Expression::FunctionCall(inner) => inner.node.define_types(_context),
@@ -55,8 +53,6 @@ impl AbstractNode for Expression {
     }
 
     fn validate(&self, context: &Context, manage_memory: bool) -> Result<(), ValidationError> {
-        log::trace!("Validating expression at {}", self.position());
-
         match self {
             Expression::As(r#as) => r#as.node.validate(context, manage_memory),
             Expression::FunctionCall(function_call) => {
@@ -87,8 +83,6 @@ impl AbstractNode for Expression {
         context: &Context,
         manage_memory: bool,
     ) -> Result<Option<Evaluation>, RuntimeError> {
-        log::trace!("Evaluating expression at {}", self.position());
-
         match self {
             Expression::As(r#as) => r#as.node.evaluate(context, manage_memory),
             Expression::FunctionCall(function_call) => {

dust-lang/src/abstract_tree/function_call.rs

@@ -8,7 +8,7 @@ use crate::{
     value::ValueInner,
 };
 
-use super::{AbstractNode, Evaluation, Expression, Type, TypeConstructor, ValueNode, WithPosition};
+use super::{AbstractNode, Evaluation, Expression, Type, TypeConstructor};
 
 #[derive(Debug, Clone, Serialize, Deserialize)]
 pub struct FunctionCall {
@@ -143,16 +143,6 @@ impl AbstractNode for FunctionCall {
         context: &Context,
         manage_memory: bool,
     ) -> Result<Option<Evaluation>, RuntimeError> {
-        if let Expression::Value(WithPosition {
-            node: ValueNode::BuiltInFunction(function),
-            ..
-        }) = *self.function_expression
-        {
-            return function
-                .call(context, manage_memory)
-                .map(|value_option| value_option.map(|value| Evaluation::Return(value)));
-        }
-
         let function_position = self.function_expression.position();
         let evaluation = self.function_expression.evaluate(context, manage_memory)?;
         let value = if let Some(Evaluation::Return(value)) = evaluation {
@@ -162,17 +152,8 @@ impl AbstractNode for FunctionCall {
                 ValidationError::ExpectedExpression(function_position),
             ));
         };
-        let function = if let ValueInner::Function(function) = value.inner().as_ref() {
-            function.clone()
-        } else {
-            return Err(RuntimeError::ValidationFailure(
-                ValidationError::ExpectedFunction {
-                    actual: value.r#type(context)?,
-                    position: function_position,
-                },
-            ));
-        };
 
+        if let ValueInner::Function(function) = value.inner().as_ref() {
             if let (Some(type_parameters), Some(type_arguments)) =
                 (function.type_parameters(), self.type_arguments)
             {
@@ -188,7 +169,9 @@ impl AbstractNode for FunctionCall {
             if let (Some(parameters), Some(arguments)) =
                 (function.value_parameters(), self.value_arguments)
             {
-            for ((identifier, _), expression) in parameters.into_iter().zip(arguments.into_iter()) {
+                for ((identifier, _), expression) in
+                    parameters.into_iter().zip(arguments.into_iter())
+                {
                     let position = expression.position();
                     let evaluation = expression.evaluate(context, manage_memory)?;
                     let value = if let Some(Evaluation::Return(value)) = evaluation {
@@ -203,7 +186,67 @@ impl AbstractNode for FunctionCall {
                 }
             }
 
-        function.call(&self.context, manage_memory)
+            return function.clone().call(&self.context, manage_memory);
+        }
+
+        if let ValueInner::BuiltInFunction(function) = value.inner().as_ref() {
+            let (type_parameters, value_parameters, _) = if let Type::Function {
+                type_parameters,
+                value_parameters,
+                return_type,
+            } = function.r#type()
+            {
+                (type_parameters, value_parameters, return_type)
+            } else {
+                return Err(RuntimeError::ValidationFailure(
+                    ValidationError::ExpectedFunction {
+                        actual: function.r#type(),
+                        position: function_position,
+                    },
+                ));
+            };
+
+            if let (Some(type_parameters), Some(type_arguments)) =
+                (type_parameters, self.type_arguments)
+            {
+                for (identifier, constructor) in
+                    type_parameters.into_iter().zip(type_arguments.into_iter())
+                {
+                    let r#type = constructor.construct(context)?;
+
+                    self.context.set_type(identifier.clone(), r#type)?;
+                }
+            }
+
+            if let (Some(parameters), Some(arguments)) = (value_parameters, self.value_arguments) {
+                for ((identifier, _), expression) in
+                    parameters.into_iter().zip(arguments.into_iter())
+                {
+                    let position = expression.position();
+                    let evaluation = expression.evaluate(context, manage_memory)?;
+                    let value = if let Some(Evaluation::Return(value)) = evaluation {
+                        value
+                    } else {
+                        return Err(RuntimeError::ValidationFailure(
+                            ValidationError::ExpectedValue(position),
+                        ));
+                    };
+
+                    self.context.set_value(identifier.clone(), value)?;
+                }
+            }
+
+            return function
+                .call(&self.context, manage_memory)
+                .map(|option| option.map(|value| Evaluation::Return(value)));
+        }
+
+        return Err(RuntimeError::ValidationFailure(
+            ValidationError::ExpectedFunction {
+                actual: value.r#type(context)?,
+                position: function_position,
+            },
+        ));
     }
 
     fn expected_type(&self, context: &Context) -> Result<Option<Type>, ValidationError> {

dust-lang/src/abstract_tree/type.rs

@@ -235,10 +235,10 @@ impl Display for Type {
             }
             Type::Float => write!(f, "float"),
             Type::Generic { concrete_type, .. } => {
-                if let Some(r#type) = concrete_type {
+                match concrete_type.clone().map(|r#box| *r#box) {
-                    write!(f, "implied to be {}", r#type)
+                    Some(Type::Generic { identifier, .. }) => write!(f, "{identifier}"),
-                } else {
+                    Some(concrete_type) => write!(f, "implied to be {concrete_type}"),
-                    write!(f, "unknown")
+                    None => write!(f, "unknown"),
                 }
             }
             Type::Integer => write!(f, "int"),

dust-lang/src/value.rs

@@ -169,7 +169,7 @@ impl Display for Value {
                 write!(f, "{{ ")?;
 
                 for (index, (key, value)) in map.into_iter().enumerate() {
-                    write!(f, "{key} = {value}")?;
+                    write!(f, "{key} = {value:?}")?;
 
                     if index != map.len() - 1 {
                         write!(f, ", ")?;
@@ -178,7 +178,7 @@ impl Display for Value {
 
                 write!(f, " }}")
             }
-            ValueInner::Range(_) => todo!(),
+            ValueInner::Range(range) => write!(f, "{}..{}", range.start, range.end),
             ValueInner::String(string) => write!(f, "{string}"),
             ValueInner::Function(Function {
                 type_parameters,
@@ -187,14 +187,16 @@ impl Display for Value {
                 body,
                 ..
             }) => {
+                write!(f, "fn ")?;
+
                 if let Some(type_parameters) = type_parameters {
                     write!(f, "(")?;
 
-                    for (index, r#type) in type_parameters.into_iter().enumerate() {
+                    for (index, identifier) in type_parameters.into_iter().enumerate() {
                         if index == type_parameters.len() - 1 {
-                            write!(f, "{}", r#type)?;
+                            write!(f, "{}", identifier)?;
                         } else {
-                            write!(f, "{} ", r#type)?;
+                            write!(f, "{} ", identifier)?;
                         }
                     }
 
@@ -226,7 +228,7 @@ impl Display for Value {
 
                 write!(f, "}}")
             }
-            ValueInner::BuiltInFunction(_) => todo!(),
+            ValueInner::BuiltInFunction(built_in_function) => write!(f, "{built_in_function}"),
         }
     }
 }

examples/type_inference.ds

@@ -1,8 +1,8 @@
 // This function returns its argument.
-foo = fn |T| (x: T) -> T { x }
+foo = fn <T>(x: T) -> T { x }
 
 // Use turbofish to supply type information.
-bar = foo::(str)::("hi")
+bar = foo::<str>("hi")
 
 // Use type annotation
 baz: str = foo("hi")
@@ -10,7 +10,7 @@ baz: str = foo("hi")
 // The `json.parse` function takes a string and returns the specified type
 
 // Use turbofish
-x = json.parse::(int)::("1")
+x = json.parse::<int>("1")
 
 // Use type annotation
 x: int = json.parse("1")