1// SPDX-License-Identifier: MIT OR MPL-2.0 OR LGPL-2.1-or-later OR GPL-2.0-or-later
2// Copyright 2011, SIL International, All rights reserved.
3
4// JSON pretty printer for graphite font debug output logging.
5// Created on: 15 Dec 2011
6// Author: Tim Eves
7
8#pragma once
9
10#include "inc/Main.h"
11#include <cassert>
12#include <cstdio>
13#include <cstdint>
14#include "inc/List.h"
15
16namespace graphite2 {
17
18class json
19{
20 // Prevent copying
21 json(const json &);
22 json & operator = (const json &);
23
24 typedef void (*_context_t)(json &);
25
26 FILE * const _stream;
27 char _contexts[128], // context stack
28 * _context, // current context (top of stack)
29 * _flatten; // if !0 points to context above which
30 // pretty printed output should occur.
31 Vector<void *> _env;
32
33 void context(const char current) throw();
34 void indent(const int d=0) throw();
35 void push_context(const char, const char) throw();
36 void pop_context() throw();
37
38public:
39 class closer;
40
41 using string = const char *;
42 using number = double;
43 enum class integer : std::intmax_t {};
44 enum class integer_u : std::uintmax_t {};
45 using boolean = bool;
46 static const std::nullptr_t null;
47
48 void setenv(unsigned int index, void *val) { _env.reserve(index + 1); if (index >= _env.size()) _env.insert(_env.end(), _env.size() - index + 1, 0); _env[index] = val; }
49 void *getenv(unsigned int index) const { return _env[index]; }
50 const Vector<void *> &getenvs() const { return _env; }
51
52 static void flat(json &) throw();
53 static void close(json &) throw();
54 static void object(json &) throw();
55 static void array(json &) throw();
56 static void item(json &) throw();
57
58 json(FILE * stream) throw();
59 ~json() throw ();
60
61 FILE * stream() const throw();
62
63 json & operator << (string) throw();
64 json & operator << (number) throw();
65 json & operator << (integer) throw();
66 json & operator << (integer_u) throw();
67 json & operator << (boolean) throw();
68 json & operator << (std::nullptr_t) throw();
69 json & operator << (_context_t) throw();
70
71 operator bool() const throw();
72 bool good() const throw();
73 bool eof() const throw();
74
75 CLASS_NEW_DELETE;
76};
77
78class json::closer
79{
80 // Prevent copying.
81 closer(const closer &);
82 closer & operator = (const closer &);
83
84 json * const _j;
85public:
86 closer(json * const j) : _j(j) {}
87 ~closer() throw() { if (_j) *_j << close; }
88};
89
90inline
91json::json(FILE * s) throw()
92: _stream(s), _context(_contexts), _flatten(0)
93{
94 if (good())
95 fflush(s);
96}
97
98
99inline
100json::~json() throw ()
101{
102 while (_context > _contexts) pop_context();
103}
104
105inline
106FILE * json::stream() const throw() { return _stream; }
107
108
109inline
110json & json::operator << (json::_context_t ctxt) throw()
111{
112 ctxt(*this);
113 return *this;
114}
115
116inline
117json & operator << (json & j, signed char d) throw() { return j << json::integer(d); }
118
119inline
120json & operator << (json & j, unsigned char d) throw() { return j << json::integer_u(d); }
121
122inline
123json & operator << (json & j, short int d) throw() { return j << json::integer(d); }
124
125inline
126json & operator << (json & j, unsigned short int d) throw() { return j << json::integer_u(d); }
127
128inline
129json & operator << (json & j, int d) throw() { return j << json::integer(d); }
130
131inline
132json & operator << (json & j, unsigned int d) throw() { return j << json::integer_u(d); }
133
134inline
135json & operator << (json & j, long int d) throw() { return j << json::integer(d); }
136
137inline
138json & operator << (json & j, unsigned long int d) throw() { return j << json::integer_u(d); }
139
140inline
141json & operator << (json & j, long long int d) throw() { return j << json::integer(d); }
142
143inline
144json & operator << (json & j, unsigned long long int d) throw() { return j << json::integer_u(d); }
145
146inline
147json::operator bool() const throw() { return good(); }
148
149inline
150bool json::good() const throw() { return _stream && ferror(_stream) == 0; }
151
152inline
153bool json::eof() const throw() { return feof(_stream) != 0; }
154
155} // namespace graphite2
156