replace leading _ for private symbols with keyword hide

tree-sitter-brolang/grammar.js

@@ -51,6 +51,7 @@ module.exports = grammar({
     ),
 
     function_declaration: $ => seq(
+      optional('hide'),
       field('name', $.identifier),
       field('kind', choice('func', 'c_func')),
       field('parameters', $.parameter_list),
@@ -64,6 +65,7 @@ module.exports = grammar({
     ),
 
     type_declaration: $ => prec(1, seq(
+      optional('hide'),
       field('name', $.identifier),
       '::',
       repeat($._newline),
@@ -79,6 +81,7 @@ module.exports = grammar({
     )),
 
     global_constant_declaration: $ => seq(
+      optional('hide'),
       field('name', $.identifier),
       optional(field('type', $.type)),
       '::',
@@ -87,6 +90,7 @@ module.exports = grammar({
     ),
 
     global_variable_declaration: $ => seq(
+      optional('hide'),
       field('name', $.identifier),
       optional(field('type', $.type)),
       '=',

tree-sitter-brolang/queries/highlights.scm

@@ -60,6 +60,7 @@
   "distinct"
   "alias"
   "import"
+  "hide"
   "return"
   "try"
   "catch"

tree-sitter-brolang/src/grammar.json

@@ -103,6 +103,18 @@
     "function_declaration": {
       "type": "SEQ",
       "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "hide"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "FIELD",
           "name": "name",
@@ -225,6 +237,18 @@
       "content": {
         "type": "SEQ",
         "members": [
+          {
+            "type": "CHOICE",
+            "members": [
+              {
+                "type": "STRING",
+                "value": "hide"
+              },
+              {
+                "type": "BLANK"
+              }
+            ]
+          },
           {
             "type": "FIELD",
             "name": "name",
@@ -287,6 +311,18 @@
     "global_constant_declaration": {
       "type": "SEQ",
       "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "hide"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "FIELD",
           "name": "name",
@@ -335,6 +371,18 @@
     "global_variable_declaration": {
       "type": "SEQ",
       "members": [
+        {
+          "type": "CHOICE",
+          "members": [
+            {
+              "type": "STRING",
+              "value": "hide"
+            },
+            {
+              "type": "BLANK"
+            }
+          ]
+        },
         {
           "type": "FIELD",
           "name": "name",

tree-sitter-brolang/src/node-types.json

@@ -2576,6 +2576,10 @@
     "type": "func",
     "named": false
   },
+  {
+    "type": "hide",
+    "named": false
+  },
   {
     "type": "i16",
     "named": false

tree-sitter-brolang/test/corpus/syntax.txt

@@ -4,6 +4,16 @@ Core syntax
 
 io :: import "@std/io"
 
+hide private_value :: 1
+
+hide private_counter i32 = 0
+
+hide Private :: opaque
+
+hide private_sum func(a, b i32) i32 {
+	return a + b
+}
+
 Status :: enum {
 	ok
 	bad
@@ -30,6 +40,38 @@ sum func(a, b i32) i32 ! Status {
     (identifier)
     (string
       (string_content)))
+  (global_constant_declaration
+    (identifier)
+    (expression
+      (integer)))
+  (global_variable_declaration
+    (identifier)
+    (type
+      (builtin_type))
+    (expression
+      (integer)))
+  (type_declaration
+    (identifier)
+    (opaque_type))
+  (function_declaration
+    (identifier)
+    (parameter_list
+      (parameter
+        (identifier)
+        (identifier)
+        (type
+          (builtin_type))))
+    (type
+      (builtin_type))
+    (block
+      (statement
+        (return_statement
+          (expression
+            (binary_expression
+              (expression
+                (identifier))
+              (expression
+                (identifier))))))))
   (type_declaration
     (identifier)
     (enum_type

tree-sitter-brolang/test/highlight/intrinsics.bro

@@ -1,7 +1,10 @@
+hide helper func() void {}
+# <- keyword
+
 main func() void {
 	_ = sizeof!(i32)
 #	    ^^^^^^ function.builtin
-#	          ^ operator
+#	         ^ operator
 	_ = sizeof(i32)
 #	    ^^^^^^ function
 }