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