dot and return

src/parser/parser.rs

@@ -14,6 +14,10 @@ pub fn parse<T>(tokens: &mut Tokens, parser: Parser<T>) -> Result<T, Error> {
     }
 }
 
+pub fn parse_program(tokens: &mut Tokens) -> ParseResult<ast::Program> {
+    Ok(parse_definitions(tokens)?.map(ast::Program))
+}
+
 fn parse_definitions(tokens: &mut Tokens) -> ParseResult<Vec<ast::Definition>> {
     tokens.many(parse_definition)
 }
@@ -40,6 +44,26 @@ fn parse_set(tokens: &mut Tokens) -> ParseResult<ast::Expr> {
     }
 }
 
+fn parse_dot(tokens: &mut Tokens, expr: ast::Expr) -> Result<ast::Expr, Error> {
+    if let Some(_dot) = tokens.next_if(&Token::Dot) {
+        if let Some(labels) = tokens.many_sep_by(&Token::Dot, parse_identifier_label)? {
+            Ok(labels
+                .into_iter()
+                .fold(expr, |acc, label| ast::Expr::Access {
+                    expr: Box::new(acc),
+                    field: label,
+                }))
+        } else {
+            Err(Error::UnexpectedToken {
+                expected: Token::Dot,
+                got: tokens.next(),
+            })
+        }
+    } else {
+        Ok(expr)
+    }
+}
+
 fn parse_definition(tokens: &mut Tokens) -> ParseResult<ast::Definition> {
     if let Some(_) = tokens.next_if(&Token::Let) {
         if let Some(name) = parse_identifier_name(tokens)? {
@@ -64,12 +88,13 @@ fn parse_definition(tokens: &mut Tokens) -> ParseResult<ast::Definition> {
 
 fn parse_expr(tokens: &mut Tokens) -> ParseResult<ast::Expr> {
     if let Some(expr1) = parse_simple_expr(tokens)? {
+        let expr1 = parse_dot(tokens, expr1)?;
         if let Some(args) = tokens.between(&Token::OpenParen, &Token::CloseParen, |ts| {
             ts.many_sep_by(&Token::Comma, parse_expr)
         })? {
             Ok(Some(ast::Expr::FunCall {
                 func: Box::new(expr1),
-                args: args,
+                args,
             }))
         } else {
             Ok(parse_set(tokens)?
@@ -131,7 +156,20 @@ fn parse_block(tokens: &mut Tokens) -> ParseResult<Vec<ast::Statement>> {
 
 fn parse_statement(tokens: &mut Tokens) -> ParseResult<ast::Statement> {
     tokens.one_of(vec![
-        |tokens| Ok(parse_expr(tokens)?.map(ast::Statement::Expr)),
+        |tokens| {
+            if let Some(expr) = parse_expr(tokens)?.map(ast::Statement::Expr) {
+                if let Some(_) = tokens.next_if(&Token::Semicolon) {
+                    Ok(Some(expr))
+                } else {
+                    Err(Error::UnexpectedToken {
+                        expected: Token::Semicolon,
+                        got: tokens.next(),
+                    })
+                }
+            } else {
+                Ok(None)
+            }
+        },
         |tokens| Ok(parse_definition(tokens)?.map(ast::Statement::Let)),
         |tokens| {
             if let Some(_) = tokens.next_if(&Token::Return) {
@@ -321,7 +359,7 @@ mod tests {
     }
     #[test]
     fn fn_def() {
-        let program = "fn(a1, boco, c_c) { 108 }".to_string();
+        let program = "fn(a1, boco, c_c) { return 108; }".to_string();
         let result = parse(&mut scan(program), parse_expr);
         insta::assert_debug_snapshot!(result);
     }
@@ -333,7 +371,7 @@ mod tests {
     }
     #[test]
     fn paren_fncall() {
-        let program = "(fn(a1, boco, c_c) { 108 })()".to_string();
+        let program = "(fn(a1, boco, c_c) { return 108; })()".to_string();
         let result = parse(&mut scan(program), parse_expr);
         insta::assert_debug_snapshot!(result);
     }

src/parser/snapshots/ayin__parser__parser__tests__fn_def.snap

@@ -24,10 +24,12 @@ Ok(
             ],
             body: Block(
                 [
-                    Expr(
+                    Return(
-                        Value(
+                        Some(
-                            Int(
+                            Value(
-                                108,
+                                Int(
+                                    108,
+                                ),
                             ),
                         ),
                     ),

src/parser/snapshots/ayin__parser__parser__tests__paren_fncall.snap

@@ -25,10 +25,12 @@ Ok(
                 ],
                 body: Block(
                     [
-                        Expr(
+                        Return(
-                            Value(
+                            Some(
-                                Int(
+                                Value(
-                                    108,
+                                    Int(
+                                        108,
+                                    ),
                                 ),
                             ),
                         ),