wip:

Add type system and refator for having only epression

src/frontend/lexer.rs

@@ -16,7 +16,7 @@ pub struct Lexer {
 fn get_keyword_token(word: &str) -> Option<TokenType> {
     match word {
         "and" => Some(TokenType::And),
-        "class" => Some(TokenType::Class),
+        "struct" => Some(TokenType::Struct),
         "do" => Some(TokenType::StartBlock),
         "end" => Some(TokenType::EndBlock),
         "false" => Some(TokenType::False),
@@ -514,4 +514,32 @@ mod tests {
         assert_eq!(tokens[1].source_slice.start_position.line, 1);
         assert_eq!(tokens[1].source_slice.start_position.column, 0);
     }
+
+    #[test]
+    fn handle_struct() {
+        let tokens = lex("Cosa :: struct {field1: Number, field2: String}");
+        let tokens_tyepe: Vec<TokenType> = tokens.iter().map(|x| x.token_type.clone()).collect();
+        let tokent_for_check = vec![
+            TokenType::Identifier,
+            TokenType::Colon,
+            TokenType::Colon,
+            TokenType::Struct,
+            TokenType::LeftBrace,
+            TokenType::Identifier,
+            TokenType::Colon,
+            TokenType::Identifier,
+            TokenType::Comma,
+            TokenType::Identifier,
+            TokenType::Colon,
+            TokenType::Identifier,
+            TokenType::RightBrace,
+            TokenType::Eof,
+        ];
+        assert_eq!(tokens_tyepe, tokent_for_check);
+        assert_eq!(tokens[0].lexeme, "Cosa");
+        assert_eq!(tokens[5].lexeme, "field1");
+        assert_eq!(tokens[7].lexeme, "Number");
+        assert_eq!(tokens[9].lexeme, "field2");
+        assert_eq!(tokens[11].lexeme, "String");
+    }
 }

src/frontend/source_registry.rs

@@ -121,6 +121,14 @@ impl SourceSlice {
             end_position,
         }
     }
+
+    pub fn from_source_slices(start_point: SourceSlice, end_point: SourceSlice) -> Self {
+        Self {
+            source_id: start_point.source_id,
+            start_position: start_point.start_position,
+            end_position: end_point.end_position,
+        }
+    }
     pub fn tree_point(
         source_id: SourceId,
         column_start: usize,

src/frontend/tokens.rs

@@ -35,11 +35,12 @@ pub enum TokenType {
     Identifier,
     String,
     Number,
+    Atom,
 
     // Keywords
     Fn,
     And,
-    Class,
+    Struct,
     StartBlock,
     EndBlock,
     False,
@@ -80,8 +81,9 @@ impl fmt::Display for TokenType {
             TokenType::Identifier => write!(f, "IDENTIFIER"),
             TokenType::String => write!(f, "STRING"),
             TokenType::Number => write!(f, "NUMBER"),
+            TokenType::Atom => write!(f, "ATOM"),
             TokenType::And => write!(f, "and"),
-            TokenType::Class => write!(f, "class"),
+            TokenType::Struct => write!(f, "struct"),
             TokenType::Else => write!(f, "else"),
             TokenType::False => write!(f, "false"),
             TokenType::True => write!(f, "true"),