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 | |
16 | namespace graphite2 { |
17 | |
18 | class 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 | |
38 | public: |
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 | |
78 | class json::closer |
79 | { |
80 | // Prevent copying. |
81 | closer(const closer &); |
82 | closer & operator = (const closer &); |
83 | |
84 | json * const _j; |
85 | public: |
86 | closer(json * const j) : _j(j) {} |
87 | ~closer() throw() { if (_j) *_j << close; } |
88 | }; |
89 | |
90 | inline |
91 | json::json(FILE * s) throw() |
92 | : _stream(s), _context(_contexts), _flatten(0) |
93 | { |
94 | if (good()) |
95 | fflush(s); |
96 | } |
97 | |
98 | |
99 | inline |
100 | json::~json() throw () |
101 | { |
102 | while (_context > _contexts) pop_context(); |
103 | } |
104 | |
105 | inline |
106 | FILE * json::stream() const throw() { return _stream; } |
107 | |
108 | |
109 | inline |
110 | json & json::operator << (json::_context_t ctxt) throw() |
111 | { |
112 | ctxt(*this); |
113 | return *this; |
114 | } |
115 | |
116 | inline |
117 | json & operator << (json & j, signed char d) throw() { return j << json::integer(d); } |
118 | |
119 | inline |
120 | json & operator << (json & j, unsigned char d) throw() { return j << json::integer_u(d); } |
121 | |
122 | inline |
123 | json & operator << (json & j, short int d) throw() { return j << json::integer(d); } |
124 | |
125 | inline |
126 | json & operator << (json & j, unsigned short int d) throw() { return j << json::integer_u(d); } |
127 | |
128 | inline |
129 | json & operator << (json & j, int d) throw() { return j << json::integer(d); } |
130 | |
131 | inline |
132 | json & operator << (json & j, unsigned int d) throw() { return j << json::integer_u(d); } |
133 | |
134 | inline |
135 | json & operator << (json & j, long int d) throw() { return j << json::integer(d); } |
136 | |
137 | inline |
138 | json & operator << (json & j, unsigned long int d) throw() { return j << json::integer_u(d); } |
139 | |
140 | inline |
141 | json & operator << (json & j, long long int d) throw() { return j << json::integer(d); } |
142 | |
143 | inline |
144 | json & operator << (json & j, unsigned long long int d) throw() { return j << json::integer_u(d); } |
145 | |
146 | inline |
147 | json::operator bool() const throw() { return good(); } |
148 | |
149 | inline |
150 | bool json::good() const throw() { return _stream && ferror(_stream) == 0; } |
151 | |
152 | inline |
153 | bool json::eof() const throw() { return feof(_stream) != 0; } |
154 | |
155 | } // namespace graphite2 |
156 | |