fix(tolk): don't show private fields in completion (#231)

Author: i582

server/src/e2e/tolk/testcases/completion/fields.test

@@ -177,3 +177,21 @@ struct Foo {
 ------------------------------------------------------------------------
 13 private
 13 readonly
+
+========================================================================
+Struct fields completion with private
+========================================================================
+struct Foo {
+    first: int,
+    private second: slice,
+}
+
+fun main() {
+    val foo = Foo {};
+    foo.<caret>;
+}
+------------------------------------------------------------------------
+9  first: int   of Foo
+1  forceLoadLazyObject(self): slice
+1  stackMoveToTop(mutate self): void
+1  toCell(self, options: PackOptions = {}): Cell<T>

server/src/languages/tolk/completion/ReferenceCompletionProcessor.ts

@@ -71,6 +71,11 @@ export class ReferenceCompletionProcessor implements ScopeProcessor {
         // since structs can be created like `Foo{}` we allow them
         if (node instanceof Struct) return true
         if (node instanceof Enum) return true // for Color.Red
+
+        if (node instanceof Field) {
+            if (node.isPrivate()) return false
+        }
+
         return true
     }
 

server/src/languages/tolk/psi/Decls.ts

@@ -491,6 +491,12 @@ export class Field extends NamedNode {
         return new Struct(ownerNode, this.file)
     }
 
+    public isPrivate(): boolean {
+        const modifiers = this.node.childForFieldName("modifiers")
+        if (!modifiers) return false
+        return modifiers.children.some(it => it?.text === "private")
+    }
+
     public modifiers(): string[] {
         const modifiers = this.node.childForFieldName("modifiers")
         if (!modifiers) return []