Parsing refactor pt4

src/main.rs

@@ -13,7 +13,6 @@ mod lexic;
 mod semantic;
 // Transforms an AST to JS
 mod codegen;
-mod utils;
 
 mod error_handling;
 

src/syntax/binding.rs

@@ -3,7 +3,6 @@ use super::utils::{parse_token_type, try_operator};
 use super::{expression, ParseResult, ParsingError};
 use crate::error_handling::SyntaxError;
 use crate::lexic::token::{Token, TokenType};
-use crate::utils::Result3;
 
 pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Binding> {
     let mut current_pos = pos;
@@ -64,8 +63,8 @@ pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Binding>
      * Equal (=) operator
      */
     let equal_operator = match try_operator(tokens, current_pos, String::from("=")) {
-        Result3::Ok(t) => t,
-        Result3::Err(t) => {
+        Ok((t, _)) => t,
+        Err(ParsingError::Mismatch(t)) => {
             // The parser found a token, but it's not the `=` operator
             return ParseResult::Err(SyntaxError {
                 reason: format!("There should be an equal sign `=` after the identifier"),
@@ -73,7 +72,7 @@ pub fn try_parse<'a>(tokens: &'a Vec<Token>, pos: usize) -> ParseResult<Binding>
                 error_end: t.get_end_position(),
             });
         }
-        Result3::None => {
+        _ => {
             // The parser didn't find the `=` operator after the identifier
             return ParseResult::Err(SyntaxError {
                 reason: format!("There should be an equal sign `=` after the identifier",),
@@ -141,7 +140,7 @@ mod tests {
     #[test]
     fn should_parse_operator() {
         let tokens = get_tokens(&String::from("=")).unwrap();
-        let token = *try_operator(&tokens, 0, String::from("=")).unwrap();
+        let (token, _) = try_operator(&tokens, 0, String::from("=")).unwrap();
 
         assert_eq!("=", token.value);
     }

src/syntax/utils.rs

@@ -1,7 +1,4 @@
-use crate::{
-    lexic::token::{Token, TokenType},
-    utils::Result3,
-};
+use crate::lexic::token::{Token, TokenType};
 
 use super::{ParsingError, ParsingResult};
 
@@ -34,14 +31,14 @@ impl Tokenizer for Vec<Token> {
 }
 
 /// Expects the token at `pos` to be an operator of value `operator`. Doesn't ignore whitespace or newlines
-pub fn try_operator(tokens: &Vec<Token>, pos: usize, operator: String) -> Result3<&Token> {
+pub fn try_operator(tokens: &Vec<Token>, pos: usize, operator: String) -> ParsingResult<&Token> {
     match tokens.get(pos) {
-        Some(t) if t.token_type == TokenType::Operator && t.value == operator => Result3::Ok(t),
+        Some(t) if t.token_type == TokenType::Operator && t.value == operator => Ok((t, pos + 1)),
         Some(t) if t.token_type == TokenType::NewLine || t.token_type == TokenType::EOF => {
-            Result3::None
+            Err(ParsingError::Unmatched)
         }
-        Some(t) => Result3::Err(t),
-        None => Result3::None,
+        Some(t) => Err(ParsingError::Mismatch(t)),
+        None => Err(ParsingError::Unmatched),
     }
 }
 

src/utils/mod.rs

@@ -1,15 +0,0 @@
-pub enum Result3<T> {
-    Ok(T),
-    Err(T),
-    None,
-}
-
-#[allow(dead_code)]
-impl<T> Result3<T> {
-    pub fn unwrap(&self) -> &T {
-        match self {
-            Result3::Ok(t) => t,
-            _ => panic!(""),
-        }
-    }
-}