Parse empty arguments list

src/syntax/ast/functions.rs

@@ -2,5 +2,14 @@
 
 #[derive(Debug)]
 pub struct FunctionCall {
-    identifier: Box<String>
+    pub identifier: Box<String>
 }
+
+
+#[derive(Debug)]
+pub struct ArgumentsList {
+    pub arguments: Vec<Box<Argument>>
+}
+
+#[derive(Debug)]
+pub enum Argument {}

src/syntax/functions/function_call.rs

@@ -1,21 +1,42 @@
-use crate::{lexic::token::Token, syntax::{ParseResult, ast::functions::FunctionCall}};
+use crate::{lexic::token::{Token, TokenType}, syntax::{ParseResult, ast::functions::FunctionCall, utils::parse_token_type}, error_handling::SyntaxError};
 
 
 
 pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<FunctionCall, ()> {
+    let mut current_pos = pos;
 
+    // Parse identifier
+    let (identifier, next_pos) = match parse_token_type(tokens, current_pos, TokenType::Identifier)
+    {
+        ParseResult::Ok(id, next) => (id, next),
+        ParseResult::Err(err) => return ParseResult::Err(err),
+        ParseResult::Mismatch(_) => {
+            return ParseResult::Unmatched;
+        }
+        ParseResult::Unmatched => {
+            return ParseResult::Unmatched;
+        }
+    };
+    current_pos = next_pos;
 
+    // Parse arguments list
 
-    todo!()
+    ParseResult::Unmatched
 }
 
 
 #[cfg(test)]
 mod tests {
+    use crate::lexic::get_tokens;
     use super::*;
 
     #[test]
-    fn should_parse_1() {
+    fn should_not_parse_identifier_alone() {
+        let tokens = get_tokens(&String::from("function_name")).unwrap();
+        let fun_decl = try_parse(&tokens, 0);
 
+        let ParseResult::Unmatched = fun_decl else {
+            panic!("Expected an unmatched result: {:?}", fun_decl);
+        };
     }
 }

src/syntax/functions/mod.rs

@@ -1 +1,2 @@
 pub mod function_call;
+pub mod arguments_list;

src/syntax/mod.rs

@@ -30,9 +30,16 @@ pub enum SyntaxResult {
 
 #[derive(Debug)]
 pub enum ParseResult<A, B> {
+    /// The parsing was a success
     Ok(A, usize),
+    /// The parsing failed past a point of no return.
+    /// 
+    /// For example, when parsing a function declaration
+    /// the `fun` token is found, but then no identifier
     Err(SyntaxError),
+    /// A construct different from the one expected was found
     Mismatch(B),
+    /// No construct was found
     Unmatched,
 }