.

src/language_frontend/abstract_syntax_tree/ast.rs

@@ -22,10 +22,7 @@ pub enum Expr {
 
     Err,    // todo
 
-    Call {
-        callee: Box<Expr>,
-        arguments: Vec<Expr>,
-    },
+    Call(Call),
 
     Unary {
         operator: UnaryOp,
@@ -42,5 +39,8 @@ pub enum Expr {
         target: Box<Expr>,
         value: Box<Expr>,
     },
+
+    Function(Function),
+
     Error,
 }

src/language_frontend/abstract_syntax_tree/definitions.rs

@@ -50,8 +50,8 @@ pub enum Literal {
 
 #[derive(Clone, Debug, PartialEq)]
 pub enum Type {
-    UnsignedInteger,
-    SignedInteger,
+    Integer,
+    Float,
     Bool,
     Char,
     String,
@@ -59,8 +59,8 @@ pub enum Type {
 
 #[derive(Clone, Debug, PartialEq)]
 pub enum Value {
-    UnsignedInteger(u32),
-    SignedInteger(i32),
+    Integer(i64),
+    Float(f64),
     Bool(bool),
     Char(char),
     String(String),
@@ -71,8 +71,8 @@ impl Value {
         match (ty, self) {
             (Type::Bool, Value::Bool(_)) => true,
             (Type::Char, Value::Char(_)) => true,
-            (Type::SignedInteger, Value::SignedInteger(_)) => true,
-            (Type::UnsignedInteger, Value::UnsignedInteger(_)) => true,
+            (Type::Integer, Value::Integer(_)) => true,
+            (Type::Float, Value::Float(_)) => true,
             (Type::String, Value::String(_)) => true,
             _ => false,
         }
@@ -86,7 +86,6 @@ impl Value {
 #[derive(Clone, Debug, PartialEq)]
 pub struct Ident(pub Rc<str>);
 
-
 #[derive(Clone, Debug, PartialEq)]
 pub struct While {
     pub condition: Expr,
@@ -100,11 +99,33 @@ pub struct Condition {
     pub else_body: Option<BlockStatement>,
 }
 
+/// Represents the Structure of a `Function` in AkaiLang
+/// 
+/// Examples:
+///```AkaiLang
+///fun helloWorld() {
+///    print("Hello World")
+///}
+///``` 
+/// <br>
+/// 
+///```AkaiLang
+///fun returnsIntPlusOne(i: i32): i32 {
+///    -> i + 1
+///}
+///``` 
 #[derive(Clone, Debug, PartialEq)]
 pub struct Function {
     pub name: Rc<str>,
     pub params: Vec<(Ident, Type)>,
     pub return_type: Option<Type>,
     pub body: Vec<Statement>,
+    pub body_expr: Option<Type>
 }
 
+
+#[derive(Clone, Debug, PartialEq)]
+pub struct Call {
+    callee: Box<Expr>,
+    arguments: Vec<Expr>,
+}

src/language_frontend/abstract_syntax_tree/parser.rs

@@ -9,7 +9,6 @@ use crate::language_frontend::{abstract_syntax_tree::{ast::Expr, definitions::*}
 
 pub fn parse(source: &str) ->Result<Vec<Expr>, Vec<Rich<'_, Token>>> {
     let token_iter = Token::lexer(source).spanned().map(|(token, span)| (token.unwrap_or(Token::Error), span.into()));
-
     let end_of_input: SimpleSpan = (0..source.len()).into();
     let token_stream = Stream::from_iter(token_iter)
         // Tell chumsky to split the (Token, SimpleSpan) stream into its parts so that it can handle the spans for us
@@ -86,6 +85,18 @@ where
                 target: Box::new(Expr::Ident(name)), 
                 value: Box::new(rhs), 
             });
+        /*
+        let fun = just(Token::Fun)
+            .ignore_then(ident.clone())
+            .then_ignore(just(Token::LParen))
+            .then_ignore(just(Token::RParen))
+            .map(|(((name, args), ret), (body, body_expr))| Expr::Function(Function { 
+                name,
+                params: args, 
+                return_type: ret, 
+                body, 
+                body_expr 
+            })); */
         var.or(expr)
     });
 
@@ -93,6 +104,11 @@ where
 
 }
 
+pub fn lex(source: &str) -> Vec<Token> {
+    Token::lexer(&source)
+        .filter_map(|t| t.ok()).collect()
+}
+
 #[cfg(test)]
 mod tests {
     use super::*;

src/main.rs

@@ -4,6 +4,7 @@ use logos::Logos;
 
 mod language_frontend;
 
+use crate::language_frontend::abstract_syntax_tree::parser::lex;
 use crate::{
     language_frontend::lexer::tokens::Token, language_frontend::abstract_syntax_tree::parser::parse};
 
@@ -26,25 +27,8 @@ fn main() {
 
     println!("{:?}", sourcecode);
 
-    
-    let lexer =  Token::lexer(&sourcecode)
-        .spanned()
-        .collect::<Vec<_>>();
-    
-    for token in lexer {
-        println!("{:?}", token);
-    } 
-    
-    let token_iter = Token::lexer(&sourcecode).spanned().map(|(tok, span)| tok.map(|t| (t, span))).filter_map(Result::ok);
-
-    let token_stream = Stream::from_iter(token_iter)
-        // Tell chumsky to split the (Token, SimpleSpan) stream into its parts so that it can handle the spans for us
-        // This involves giving chumsky an 'end of input' span: we just use a zero-width span at the end of the string
-        .map((0..sourcecode.len()).into(), |(t, s): (_, _)| (t, s));
-
-
     match parse(&sourcecode)  {
-        Ok(res) => println!("{:?}", res),
+        Ok(res) => println!("{:#?}", res),
         Err(e) => {
             panic!("{:#?}", e)
         }