feat: no constructors for expressions and statements for saccharine

pkg/saccharine/parse.go

@@ -83,7 +83,7 @@ func parseAbstraction(i *TokenIterator) (*Abstraction, error) {
 		} else if body, err := parseExpression(i); err != nil {
 			return nil, err
 		} else {
-			return NewAbstraction(parameters, body), nil
+			return &Abstraction{Parameters: parameters, Body: body}, nil
 		}
 	})
 }
@@ -97,7 +97,7 @@ func parseApplication(i *TokenIterator) (*Application, error) {
 		} else if _, err := parseToken(i, TokenCloseParen, true); err != nil {
 			return nil, fmt.Errorf("no closing brackets (col %d): %w", i.MustGet().Column, err)
 		} else {
-			return NewApplication(expressions[0], expressions[1:]), nil
+			return &Application{Abstraction: expressions[0], Arguments: expressions[1:]}, nil
 		}
 	})
 }
@@ -106,7 +106,7 @@ func parseAtom(i *TokenIterator) (*Atom, error) {
 	if tok, err := parseToken(i, TokenAtom, true); err != nil {
 		return nil, fmt.Errorf("no variable (col %d): %w", i.Index(), err)
 	} else {
-		return NewAtom(tok.Value), nil
+		return &Atom{Name: tok.Value}, nil
 	}
 }
 
@@ -155,7 +155,7 @@ func parseClause(i *TokenIterator, braces bool) (*Clause, error) {
 		}
 	}
 
-	return NewClause(stmts[:len(stmts)-1], last.Value), nil
+	return &Clause{Statements: stmts[:len(stmts)-1], Returns: last.Value}, nil
 }
 
 func parseExpression(i *TokenIterator) (Expression, error) {
@@ -186,7 +186,7 @@ func parseLet(i *TokenIterator) (*LetStatement, error) {
 		} else if body, err := parseExpression(i); err != nil {
 			return nil, err
 		} else {
-			return NewLet(parameters[0], parameters[1:], body), nil
+			return &LetStatement{Name: parameters[0], Parameters: parameters[1:], Body: body}, nil
 		}
 	})
 }
@@ -195,7 +195,7 @@ func parseDeclare(i *TokenIterator) (*DeclareStatement, error) {
 	if value, err := parseExpression(i); err != nil {
 		return nil, err
 	} else {
-		return NewDeclare(value), nil
+		return &DeclareStatement{Value: value}, nil
 	}
 }