objcdt/json.h

   1 /*
   2 * Copyright (c) 2019 Apple Inc.  All Rights Reserved.
   3 *
   4 * @APPLE_LICENSE_HEADER_START@
   5 *
   6 * This file contains Original Code and/or Modifications of Original Code
   7 * as defined in and that are subject to the Apple Public Source License
   8 * Version 2.0 (the 'License'). You may not use this file except in
   9 * compliance with the License. Please obtain a copy of the License at
  10 * http://www.opensource.apple.com/apsl/ and read it before using this
  11 * file.
  12 *
  13 * The Original Code and all software distributed under the License are
  14 * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15 * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16 * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17 * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18 * Please see the License for the specific language governing rights and
  19 * limitations under the License.
  20 *
  21 * @APPLE_LICENSE_HEADER_END@
  22 */
  23
  24 #ifndef _OBJC_OBJCDT_JSON_H_
  25 #define _OBJC_OBJCDT_JSON_H_
  26
  27 #include <cstdint>
  28 #include <cstdbool>
  29 #include <stdio.h>
  30 #include <functional>
  31
  32 namespace json {
  33
  34 enum context: uint8_t {
  35     root,
  36     array_value,
  37     object_value,
  38     object_key,
  39     done,
  40 };
  41
  42 class writer {
  43 private:
  44     FILE *_file;
  45     context _context;
  46     int _depth;
  47     bool _needs_comma;
  48
  49     void begin_value(int sep = '\0');
  50     void advance(context old);
  51     void key(const char *key);
  52
  53 public:
  54
  55     writer(FILE *f);
  56     ~writer();
  57
  58     void object(std::function<void()>);
  59     void object(const char *key, std::function<void()>);
  60
  61     void array(std::function<void()>);
  62     void array(const char *key, std::function<void()>);
  63
  64     void boolean(bool value);
  65     void boolean(const char *key, bool value);
  66
  67     void number(uint64_t value);
  68     void number(const char *key, uint64_t value);
  69
  70     void string(const char *s);
  71     void string(const char *key, const char *s);
  72
  73     __printflike(2, 3)
  74     void stringf(const char *fmt, ...);
  75
  76     __printflike(3, 4)
  77     void stringf(const char *key, const char *fmt, ...);
  78 };
  79
  80 }
  81
  82 #endif /* _OBJC_OBJCDT_JSON_H_ */