JsonPatchParser.h

Go to the documentation of this file.

/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * JsonPatchParser.h
 * Create a JsonPatchSet from a string.
 * Copyright (C) 2014 Simon Newton
 */

#ifndef INCLUDE_OLA_WEB_JSONPATCHPARSER_H_
#define INCLUDE_OLA_WEB_JSONPATCHPARSER_H_

#include <ola/base/Macro.h>
#include <ola/web/JsonLexer.h>
#include <ola/web/JsonPatch.h>
#include <ola/web/JsonParser.h>
#include <ola/web/OptionalItem.h>
#include <memory>
#include <stack>
#include <string>

namespace ola {
namespace web {

class JsonPatchParser : public JsonParserInterface {
 public:
 explicit JsonPatchParser(JsonPatchSet *patch_set)
 : JsonParserInterface(),
 m_patch_set(patch_set),
 m_parser_depth(0),
 m_state(TOP) {
 }

 void Begin();
 void End();

 void String(const std::string &value);
 void Number(uint32_t value);
 void Number(int32_t value);
 void Number(uint64_t value);
 void Number(int64_t value);
 void Number(const JsonDouble::DoubleRepresentation &rep);
 void Number(double value);
 void Bool(bool value);
 void Null();
 void OpenArray();
 void CloseArray();
 void OpenObject();
 void ObjectKey(const std::string &key);
 void CloseObject();

 void SetError(const std::string &error);

 std::string GetError() const;

 bool IsValid() const;

 static bool Parse(const std::string &input,
 JsonPatchSet *patch_set,
 std::string *error);

 private:
 enum State {
 TOP,
 PATCH_LIST,
 PATCH,
 VALUE,
 };

 std::string m_error;
 JsonPatchSet *m_patch_set;
 std::string m_key;

 JsonParser m_parser;
 unsigned int m_parser_depth;
 State m_state;

 // Patch members;
 std::string m_op;
 OptionalItem<std::string> m_path;
 OptionalItem<std::string> m_from;
 std::auto_ptr<JsonValue> m_value;

 template <typename T>
 void HandleNumber(const T &value);

 void HandlePatchString(const std::string &value);
 void HandlePatch();

 static const char kFromKey[];
 static const char kMissingFrom[];
 static const char kMissingPath[];
 static const char kMissingValue[];
 static const char kOpKey[];
 static const char kPatchElementError[];
 static const char kPatchListError[];
 static const char kPathKey[];
 static const char kValueKey[];
 static const char kAddOp[];
 static const char kRemoveOp[];
 static const char kReplaceOp[];
 static const char kMoveOp[];
 static const char kCopyOp[];
 static const char kTestOp[];

 DISALLOW_COPY_AND_ASSIGN(JsonPatchParser);
};
} // namespace web
} // namespace ola
#endif // INCLUDE_OLA_WEB_JSONPATCHPARSER_H_