Add operator soft keyword as simple identifier

Author: punchagan

grammar.js

@@ -74,6 +74,8 @@ module.exports = grammar({
     [$.class_modifier, $.simple_identifier],
     // "internal" as visibility modifier conflicts with internal as an identifier
     [$.visibility_modifier, $.simple_identifier],
+    // "operator" as visibility modifier conflicts with operator as an identifier
+    [$.function_modifier, $.simple_identifier],
 
     // "<x>.<y> = z assignment conflicts with <x>.<y>() function call"
     [$._postfix_unary_expression, $._expression],
@@ -1113,6 +1115,7 @@ module.exports = grammar({
       "enum",
       "annotation",
       "internal",
+      "operator",
       // TODO: More soft keywords
     ),
 

test/corpus/expressions.txt

@@ -160,6 +160,8 @@ annotations.filter { annotation -> true }
 
 availability.associate { internal -> false }.toMap()
 
+operators.filter { operator -> true }
+
 --------------------------------------------------------------------------------
 
 (source_file
@@ -209,7 +211,20 @@ availability.associate { internal -> false }.toMap()
       (navigation_suffix
         (simple_identifier)))
     (call_suffix
-      (value_arguments))))
+      (value_arguments)))
+  (call_expression
+    (navigation_expression
+      (simple_identifier)
+      (navigation_suffix
+        (simple_identifier)))
+    (call_suffix
+      (annotated_lambda
+        (lambda_literal
+          (lambda_parameters
+            (variable_declaration
+              (simple_identifier)))
+          (statements
+            (boolean_literal)))))))
 
 ================================================================================
 Value declaration with receiver type

test/corpus/functions.txt

@@ -3,12 +3,20 @@ Top-level functions
 ==================
 
 fun main() {}
+operator fun main() {}
 
 ---
 
 (source_file
   (function_declaration
-    (simple_identifier) (function_value_parameters)
+    (simple_identifier)
+    (function_value_parameters)
+    (function_body))
+  (function_declaration
+    (modifiers
+      (function_modifier))
+    (simple_identifier)
+    (function_value_parameters)
     (function_body)))
 
 ==================