| // Protocol Buffers - Google's data interchange format |
| // Copyright 2008 Google Inc. All rights reserved. |
| // |
| // Use of this source code is governed by a BSD-style |
| // license that can be found in the LICENSE file or at |
| // https://developers.google.com/open-source/licenses/bsd |
| |
| #ifndef GOOGLE_PROTOBUF_JSON_INTERNAL_MESSAGE_PATH_H__ |
| #define GOOGLE_PROTOBUF_JSON_INTERNAL_MESSAGE_PATH_H__ |
| |
| #include <string> |
| #include <vector> |
| |
| #include "absl/cleanup/cleanup.h" |
| #include "absl/strings/string_view.h" |
| #include "google/protobuf/descriptor.h" |
| |
| namespace google { |
| namespace protobuf { |
| namespace json_internal { |
| // A path in a Protobuf message, annotated specifically for producing nice |
| // errors. |
| class MessagePath { |
| public: |
| explicit MessagePath(absl::string_view message_root) |
| : components_( |
| {Component{FieldDescriptor::TYPE_MESSAGE, message_root, "", -1}}) {} |
| |
| // Pushes a new field name, along with an optional type name if it is |
| // a message or enum. |
| // |
| // Returns an RAII object that will pop the field component on scope exit. |
| auto Push(absl::string_view field_name, FieldDescriptor::Type type, |
| absl::string_view type_name = "") { |
| // -1 makes it so the first call to NextRepeated makes the index 0. |
| components_.push_back(Component{type, type_name, field_name, -1}); |
| return absl::MakeCleanup([this] { components_.pop_back(); }); |
| } |
| |
| // Increments the index of this field, indicating it is a repeated field. |
| // |
| // The first time this is called, the field will be marked as repeated and |
| // the index will become 0. |
| void NextRepeated() { ++components_.back().repeated_index; } |
| |
| // Appends a description of the current state of the path to `out`. |
| void Describe(std::string& out) const; |
| |
| private: |
| struct Component { |
| FieldDescriptor::Type type; |
| absl::string_view type_name, field_name; |
| int32_t repeated_index; |
| }; |
| std::vector<Component> components_; |
| }; |
| } // namespace json_internal |
| } // namespace protobuf |
| } // namespace google |
| |
| #endif // GOOGLE_PROTOBUF_JSON_INTERNAL_MESSAGE_PATH_H__ |