Feb 15th 2023 update

external/graphqlparser/c/GraphQLAstVisitor.cpp

@@ -0,0 +1,55 @@
+/**
+ * Copyright 2019-present, GraphQL Foundation
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+#include "c/GraphQLAstVisitor.h"
+#include "AstVisitor.h"
+
+using namespace facebook::graphql::ast; // NOLINT
+
+#include "c/GraphQLAstForEachConcreteType.h"
+
+#define DECLARE_VISIT(type, snake_type) \
+  bool visit##type(const type &node) override; \
+  void endVisit##type(const type &node) override;
+
+class CVisitorBridge : public visitor::AstVisitor {
+  const struct GraphQLAstVisitorCallbacks *callbacks_;
+  void *userData_;
+public:
+  explicit CVisitorBridge(const struct GraphQLAstVisitorCallbacks *callbacks,
+                          void *userData)
+    : callbacks_(callbacks), userData_(userData) {}
+
+  FOR_EACH_CONCRETE_TYPE(DECLARE_VISIT)
+};
+
+#define IMPLEMENT_VISIT(type, snake_type)                                \
+  bool CVisitorBridge::visit##type(const type &node) {                  \
+    if (callbacks_->visit_##snake_type) {                               \
+      return callbacks_->visit_##snake_type(                            \
+        (const struct GraphQLAst##type *)&node, userData_);             \
+    }                                                                   \
+    return true;                                                        \
+  }                                                                     \
+  void CVisitorBridge::endVisit##type(const type &node) {               \
+    if (callbacks_->end_visit_##snake_type) {                           \
+      callbacks_->end_visit_##snake_type(                               \
+        (const struct GraphQLAst##type *)&node, userData_);             \
+    }                                                                   \
+  }
+
+FOR_EACH_CONCRETE_TYPE(IMPLEMENT_VISIT)
+
+void graphql_node_visit(const struct GraphQLAstNode *node,
+                        const struct GraphQLAstVisitorCallbacks *callbacks,
+                        void *userData)
+{
+  CVisitorBridge visitor(callbacks, userData);
+  if (node) {
+    reinterpret_cast<const facebook::graphql::ast::Node *>(node)->accept(&visitor);
+  }
+}