JsonPointer.h

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/*
 * 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
 *
 * JsonPointer.h
 * An implementation of RFC 6901.
 * Copyright (C) 2014 Simon Newton
 */

#ifndef INCLUDE_OLA_WEB_JSONPOINTER_H_
#define INCLUDE_OLA_WEB_JSONPOINTER_H_

#include <ola/base/Macro.h>
#include <sstream>
#include <string>
#include <vector>

namespace ola {
namespace web {

class JsonPointer {
 public:
 class Iterator {
 public:
 explicit Iterator(const JsonPointer *pointer)
 : m_pointer(pointer),
 m_index(0) {
 }

 bool IsValid() const {
 return m_index < m_pointer->TokenCount();
 }

 bool AtEnd() const {
 return m_index + 1 == m_pointer->TokenCount();
 }

 Iterator& operator++() {
 m_index++;
 return *this;
 }

 Iterator& operator++(int) {
 m_index++;
 return *this;
 }

 std::string operator*() const {
 return m_pointer->TokenAt(m_index);
 }

 private:
 const JsonPointer *m_pointer;
 unsigned int m_index;
 };

 JsonPointer();
 JsonPointer(const JsonPointer &other);

 explicit JsonPointer(const std::string &path);

 bool operator==(const JsonPointer &other) const;

 bool IsValid() const { return m_is_valid; }

 Iterator begin() const {
 return Iterator(this);
 }

 unsigned int TokenCount() const {
 return m_tokens.size() + 1;
 }

 std::string TokenAt(unsigned int i) const {
 if (i >= m_tokens.size()) {
 return "";
 } else {
 return m_tokens[i];
 }
 }

 void Push(const std::string &token);

 void Pop();

 std::string ToString() const;

 bool IsPrefixOf(const JsonPointer &other) const;

 private:
 typedef std::vector<std::string> Tokens;

 bool m_is_valid;
 Tokens m_tokens;

 static std::string EscapeString(const std::string &input);
 static std::string UnEscapeString(const std::string &input);

 void operator=(const JsonPointer&);
};
} // namespace web
} // namespace ola
#endif // INCLUDE_OLA_WEB_JSONPOINTER_H_