Accept entry families with no parameters

(entry_body): directly parse entry_body_formal_part

In Ada grammar the entry_body_formal_part both the
entry_index_specification and the parameter_profile are optional
(because they describe both simple entries and entry families,
both with and without parameters). However, tree-sitter does not
allow rules that match empty strings.

The simplest solution is to directly encode entry_body_formal_part
within the entry_body.

add test.

grammar.js

@@ -1362,7 +1362,12 @@ module.exports = grammar({
       entry_body: $ => seq(
          reservedWord('entry'),
          $.identifier,
-         optional($.non_empty_entry_body_formal_part),
+         optional(seq(
+            '(',
+            $.entry_index_specification,
+            ')',
+         )),
+         field('parameter_profile', optional($.formal_part)),
          optional($.aspect_specification),
          $.entry_barrier,
          reservedWord('is'),
@@ -1793,14 +1798,6 @@ module.exports = grammar({
          )),
          ';',
       ),
-      non_empty_entry_body_formal_part: $ => seq(
-         optional(seq(
-            '(',
-            $.entry_index_specification,
-            ')',
-         )),
-         field('parameter_profile', $.formal_part),
-      ),
       entry_declaration: $ => seq(
          optional($.overriding_indicator),
          reservedWord('entry'),

src/grammar.json

@@ -8041,15 +8041,44 @@
         {
           "type": "CHOICE",
           "members": [
+            {
+              "type": "SEQ",
+              "members": [
+                {
+                  "type": "STRING",
+                  "value": "("
+                },
                 {
                   "type": "SYMBOL",
-              "name": "non_empty_entry_body_formal_part"
+                  "name": "entry_index_specification"
+                },
+                {
+                  "type": "STRING",
+                  "value": ")"
+                }
+              ]
             },
             {
               "type": "BLANK"
             }
           ]
         },
+        {
+          "type": "FIELD",
+          "name": "parameter_profile",
+          "content": {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "SYMBOL",
+                "name": "formal_part"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          }
+        },
         {
           "type": "CHOICE",
           "members": [
@@ -10891,44 +10920,6 @@
         }
       ]
     },
-    "non_empty_entry_body_formal_part": {
-      "type": "SEQ",
-      "members": [
-        {
-          "type": "CHOICE",
-          "members": [
-            {
-              "type": "SEQ",
-              "members": [
-                {
-                  "type": "STRING",
-                  "value": "("
-                },
-                {
-                  "type": "SYMBOL",
-                  "name": "entry_index_specification"
-                },
-                {
-                  "type": "STRING",
-                  "value": ")"
-                }
-              ]
-            },
-            {
-              "type": "BLANK"
-            }
-          ]
-        },
-        {
-          "type": "FIELD",
-          "name": "parameter_profile",
-          "content": {
-            "type": "SYMBOL",
-            "name": "formal_part"
-          }
-        }
-      ]
-    },
     "_task_item": {
       "type": "CHOICE",
       "members": [

src/node-types.json

@@ -2883,7 +2883,18 @@
   {
     "type": "entry_body",
     "named": true,
-    "fields": {},
+    "fields": {
+      "parameter_profile": {
+        "multiple": false,
+        "required": false,
+        "types": [
+          {
+            "type": "formal_part",
+            "named": true
+          }
+        ]
+      }
+    },
     "children": {
       "multiple": true,
       "required": true,
@@ -2896,6 +2907,10 @@
           "type": "entry_barrier",
           "named": true
         },
+        {
+          "type": "entry_index_specification",
+          "named": true
+        },
         {
           "type": "handled_sequence_of_statements",
           "named": true
@@ -2907,10 +2922,6 @@
         {
           "type": "non_empty_declarative_part",
           "named": true
-        },
-        {
-          "type": "non_empty_entry_body_formal_part",
-          "named": true
         }
       ]
     }
@@ -7791,32 +7802,6 @@
       ]
     }
   },
-  {
-    "type": "non_empty_entry_body_formal_part",
-    "named": true,
-    "fields": {
-      "parameter_profile": {
-        "multiple": false,
-        "required": true,
-        "types": [
-          {
-            "type": "formal_part",
-            "named": true
-          }
-        ]
-      }
-    },
-    "children": {
-      "multiple": false,
-      "required": false,
-      "types": [
-        {
-          "type": "entry_index_specification",
-          "named": true
-        }
-      ]
-    }
-  },
   {
     "type": "non_empty_mode",
     "named": true,

test/corpus/protected.txt

@@ -8,6 +8,7 @@ package body P is
       function Func return Boolean;
       entry E;
       entry E2 (Color)(A : Integer);
+      entry E3 (1 .. 1);
    private
       Field : Integer;
    end Obj;
@@ -23,6 +24,10 @@ package body P is
       begin
          null;
       end E2;
+      entry E3 (for I in 1 .. 1) when True is
+      begin
+         null;
+      end E3;
    end Obj;
 end;
 
@@ -54,6 +59,13 @@ end;
                   (parameter_specification
                     (identifier)
                     (identifier))))
+              (entry_declaration
+                (identifier)
+                (range_g
+                  (term
+                    (numeric_literal))
+                  (term
+                    (numeric_literal))))
               (component_declaration
                 (identifier)
                 (component_definition
@@ -92,14 +104,29 @@ end;
             (identifier))
           (entry_body
             (identifier)
-            (non_empty_entry_body_formal_part
             (entry_index_specification
               (identifier)
               (identifier))
             (formal_part
               (parameter_specification
                 (identifier)
+                (identifier)))
+            (entry_barrier
+              (expression
+                (term
                   (identifier))))
+            (handled_sequence_of_statements
+              (null_statement))
+            (identifier))
+          (entry_body
+            (identifier)
+            (entry_index_specification
+              (identifier)
+              (range_g
+                (term
+                  (numeric_literal))
+                (term
+                  (numeric_literal))))
             (entry_barrier
               (expression
                 (term