add lookup_ident in tokenizer

Author: martcpp

src/lexericals/lexer.rs

@@ -70,9 +70,9 @@ mod test {
             Token::new (Tokenkind::Rparen, String::from(")")),
             Token::new (Tokenkind::Lbrace, String::from("{")),
             Token::new (Tokenkind::Rbrace, String::from("}")),
-            Token::new(Tokenkind::Comma, String::from(",")),
+            Token::new (Tokenkind::Comma, String::from(",")),
             Token::new (Tokenkind::Semicolon,String::from(";")),
-            Token::new(Tokenkind::Eof, String::new()), // Eof token
+            Token::new (Tokenkind::Eof, String::new()), // Eof token
         ];
         let mut lexer = Lexer::new(input);
         for (idx,exp_token) in expect_token.iter().enumerate() {

src/lexericals/tokenizer.rs

@@ -83,7 +83,18 @@ impl Display for Tokenkind {
     }
 }
 
-
+impl Tokenkind{
+    pub fn lookup_ident(ident: &String) -> Self{
+        match ident as &str {
+            "fn" => Self::Function,
+            "let" => Self::Let,
+            "if" => Self::If,
+            "else" => Self::Else,
+            "return" => Self::Return,
+            _ => Self::Ident,
+        }
+    }
+}
 
 #[cfg(test)]
 mod test{
@@ -109,4 +120,6 @@ mod test{
         let token_kind = Tokenkind::Eof;
         assert_eq!(token_kind.to_string(), "Eof");
    }
+
+   
 }

src/main.rs

@@ -22,6 +22,6 @@ fn main() {
     }
 
     // println!(" last Current character: {:?}", lexer.next_token());
-
 
-}
+}
+