/*

 * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved.

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This code is free software; you can redistribute it and/or modify it

 * under the terms of the GNU General Public License version 2 only, as

 * published by the Free Software Foundation.

 *

 * This code 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 General Public License

 * version 2 for more details (a copy is included in the LICENSE file that

 * accompanied this code).

 *

 * You should have received a copy of the GNU General Public License version

 * 2 along with this work; if not, write to the Free Software Foundation,

 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

 *

 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

 * or visit www.oracle.com if you need additional information or have any

 * questions.

 *

 */

#ifndef SHARE_VM_UTILITIES_JSON_HPP

#define SHARE_VM_UTILITIES_JSON_HPP

#include "memory/allocation.hpp"

#include "utilities/globalDefinitions.hpp"

#include "utilities/ostream.hpp"

class JSON : public ResourceObj {

 protected:

  JSON(const char* text, bool silent, outputStream* st);

  void parse();

  bool valid();

  typedef enum {

    JSON_NONE,

    JSON_OBJECT_BEGIN,

    JSON_OBJECT_END,

    JSON_ARRAY_BEGIN,

    JSON_ARRAY_END,

    JSON_KEY,

    JSON_STRING,

    JSON_NUMBER_INT,

    JSON_NUMBER_FLOAT,

    JSON_TRUE,

    JSON_FALSE,

    JSON_NULL

  } JSON_TYPE;

  typedef union {

    int64_t int_value;

    uint64_t uint_value;

    double double_value;

    struct {

      const char* start;

      size_t length;

    } str;

  } JSON_VAL;

  typedef enum {

    INTERNAL_ERROR,

    SYNTAX_ERROR,

    KEY_ERROR,

    VALUE_ERROR

  } JSON_ERROR;

  void error(JSON_ERROR e, const char* format, ...) ATTRIBUTE_PRINTF(3, 4);

  outputStream* _st;

 private:

  const char* start;

  const char* pos;

  // For error printing

  const char* mark; // Error marker

  uint level;

  uint line;

  uint column;

  bool silent;

  bool _valid;

  bool parse_json_value();

  bool parse_json_object();

  bool parse_json_array();

  bool parse_json_string(bool key = false);

  bool parse_json_key();

  bool parse_json_number();

  bool parse_json_symbol(const char* name, JSON_TYPE symbol);

  virtual bool callback(JSON_TYPE t, JSON_VAL* v, uint level) = 0;

  void mark_pos();

  u_char next();

  u_char peek();

  u_char peek(size_t i);

  int expect_any(const char* valid_chars, const char* error_msg, JSON_ERROR e = SYNTAX_ERROR);

  bool expect_string(const char* expected_string, const char* error_msg = "", JSON_ERROR e = SYNTAX_ERROR);

  size_t skip(size_t i);

  int skip_to_token();

  u_char skip_to(u_char want);

  u_char skip_line_comment();

  int skip_block_comment();

  const char* strerror(JSON_ERROR e);

};

#endif // SHARE_VM_UTILITIES_JSON_HPP