typle access expression added

corpus/test.langexp

@@ -98,6 +98,10 @@ func_2 = {
     =: Fruit @banana () -> "banana";
 
   %z := ( + ) 1 2;
+
+  // tuple access
+  %t := 1 & 2 & 3;
+  print t.0;
 }
 
 test.something = {
@@ -559,7 +563,23 @@ arg_deduction_example 'name 'duration : <- String <- Float -> Task = Task 'name
           (name_expression
             (operator)
             (number_literal)
-            (number_literal))))))
+            (number_literal))))
+      (match
+        (name_definition
+          (simple_name_identifier))
+        (case
+          (operator_expression
+            (operator_expression
+              (number_literal)
+              (operator)
+              (number_literal))
+            (operator)
+            (number_literal))))
+      (name_expression
+        (simple_name_identifier)
+        (tuple_access
+          (simple_name_identifier)
+          (number_literal)))))
   (function_definition
     (simple_name_identifier)
     (block

grammar.g4

@@ -64,6 +64,8 @@ name_definition: (('%' | 'let') | ('$' | 'var')) (SIMPLE_NAME_IDENTIFIER | PLACE
 
 access: scoped_expression '[' super_expression ']' ;
 
+tuple_access: scoped_expression, '.' NUMBER_LITERAL
+
 reference:  /* prec -1 ?? */ (('<>' | 'ref') | ('<-' | 'in')) scoped_expression ;
 
 suffix_expression: scoped_expression ('?' | '!')
@@ -111,6 +113,7 @@ scoped_expression: name_identifier
 not_name_scoped_expression: PLACEHOLDER
                           | name_definition
                           | access
+                          | tuple_access
                           | loop_control
                           | array
                           | literal

grammar.js

@@ -141,6 +141,8 @@ module.exports = grammar({
 
     access: $ => seq($._scoped_expression, '[', $._super_expression, ']'),
 
+    tuple_access: $ => seq($._scoped_expression, '.', $.number_literal),
+
     loop_control: $ => choice('break', 'continue'),
 
     reference: $ => prec(-1, seq(choice(choice('<>', 'ref'), choice('<-', 'in')), $._scoped_expression)),
@@ -204,6 +206,7 @@ module.exports = grammar({
       $.placeholder,
       $.name_definition,
       $.access,
+      $.tuple_access,
       $.loop_control,
       $.reference,
       $.suffix_expression,