add private fields

Author: pfgithub

lib/std/zig/tokenizer.zig

@@ -437,7 +437,7 @@ pub const Tokenizer = struct {
                     result.tag = .char_literal;
                     continue :state .char_literal;
                 },
-                'a'...'z', 'A'...'Z', '_' => {
+                'a'...'z', 'A'...'Z', '_', '#' => {
                     result.tag = .identifier;
                     continue :state .identifier;
                 },

src/Sema.zig

@@ -28567,6 +28567,21 @@ fn structFieldPtr(
     const field_index = struct_type.nameIndex(ip, field_name) orelse
         return sema.failWithBadStructFieldAccess(block, struct_ty, struct_type, field_name_src, field_name);
 
+    const field_name_slice = field_name.toSlice(ip);
+    if (std.mem.startsWith(u8, field_name_slice, "#")) {
+        // Get the file scope of the struct
+        const struct_namespace = struct_ty.getNamespace(zcu).unwrap().?;
+        const struct_file_scope = zcu.namespacePtr(struct_namespace).file_scope;
+
+        // Get the current file scope
+        const current_file_scope = block.getFileScopeIndex(zcu);
+
+        // If not in the same file, deny access
+        if (struct_file_scope != current_file_scope) {
+            return sema.fail(block, field_name_src, "field '{}' is private and cannot be accessed outside its defining file", .{field_name.fmt(ip)});
+        }
+    }
+
     return sema.structFieldPtrByIndex(block, src, struct_ptr, field_index, struct_ty);
 }
 
@@ -28681,6 +28696,23 @@ fn structFieldVal(
 
             const field_index = struct_type.nameIndex(ip, field_name) orelse
                 return sema.failWithBadStructFieldAccess(block, struct_ty, struct_type, field_name_src, field_name);
+
+            // Check if field is private (starts with '#')
+            const field_name_slice = field_name.toSlice(ip);
+            if (std.mem.startsWith(u8, field_name_slice, "#")) {
+                // Get the file scope of the struct
+                const struct_namespace = struct_ty.getNamespace(zcu).unwrap().?;
+                const struct_file_scope = zcu.namespacePtr(struct_namespace).file_scope;
+
+                // Get the current file scope
+                const current_file_scope = block.getFileScopeIndex(zcu);
+
+                // If not in the same file, deny access
+                if (struct_file_scope != current_file_scope) {
+                    return sema.fail(block, field_name_src, "field '{}' is private and cannot be accessed outside its defining file", .{field_name.fmt(ip)});
+                }
+            }
+
             if (struct_type.fieldIsComptime(ip, field_index)) {
                 try struct_ty.resolveStructFieldInits(pt);
                 return Air.internedToRef(struct_type.field_inits.get(ip)[field_index]);