1 /* GRAPHITE2 LICENSING
2
3 Copyright 2011, SIL International
4 All rights reserved.
5
6 This library is free software; you can redistribute it and/or modify
7 it under the terms of the GNU Lesser General Public License as published
8 by the Free Software Foundation; either version 2.1 of License, or
9 (at your option) any later version.
10
11 This program is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 Lesser General Public License for more details.
15
16 You should also have received a copy of the GNU Lesser General Public
17 License along with this library in the file named "LICENSE".
18 If not, write to the Free Software Foundation, 51 Franklin Street,
19 Suite 500, Boston, MA 02110-1335, USA or visit their web page on the
20 internet at http://www.fsf.org/licenses/lgpl.html.
21
22 Alternatively, the contents of this file may be used under the terms of the
23 Mozilla Public License (http://mozilla.org/MPL) or the GNU General Public
24 License, as published by the Free Software Foundation, either version 2
25 of the License or (at your option) any later version.
26 */
27 // JSON pretty printer for graphite font debug output logging.
28 // Created on: 15 Dec 2011
29 // Author: Tim Eves
30
31 #pragma once
32
33 #include "inc/Main.h"
34 #include <cassert>
35 #include <cstdio>
36 #include <cstdint>
37 #include "inc/List.h"
38
39 namespace graphite2 {
40
41 class json
42 {
43 // Prevent copying
44 json(const json &);
45 json & operator = (const json &);
46
47 typedef void (*_context_t)(json &);
48
49 FILE * const _stream;
50 char _contexts[128], // context stack
51 * _context, // current context (top of stack)
52 * _flatten; // if !0 points to context above which
53 // pretty printed output should occur.
54 Vector<void *> _env;
55
56 void context(const char current) throw();
57 void indent(const int d=0) throw();
58 void push_context(const char, const char) throw();
59 void pop_context() throw();
60
61 public:
62 class closer;
63
64 using string = const char *;
65 using number = double;
66 enum class integer : std::intmax_t {};
67 enum class integer_u : std::uintmax_t {};
68 using boolean = bool;
69 static const std::nullptr_t null;
70
setenv(unsigned int index,void * val)71 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; }
getenv(unsigned int index)72 void *getenv(unsigned int index) const { return _env[index]; }
getenvs()73 const Vector<void *> &getenvs() const { return _env; }
74
75 static void flat(json &) throw();
76 static void close(json &) throw();
77 static void object(json &) throw();
78 static void array(json &) throw();
79 static void item(json &) throw();
80
81 json(FILE * stream) throw();
82 ~json() throw ();
83
84 FILE * stream() const throw();
85
86 json & operator << (string) throw();
87 json & operator << (number) throw();
88 json & operator << (integer) throw();
89 json & operator << (integer_u) throw();
90 json & operator << (boolean) throw();
91 json & operator << (std::nullptr_t) throw();
92 json & operator << (_context_t) throw();
93
94 operator bool() const throw();
95 bool good() const throw();
96 bool eof() const throw();
97
98 CLASS_NEW_DELETE;
99 };
100
101 class json::closer
102 {
103 // Prevent copying.
104 closer(const closer &);
105 closer & operator = (const closer &);
106
107 json * const _j;
108 public:
closer(json * const j)109 closer(json * const j) : _j(j) {}
throw()110 ~closer() throw() { if (_j) *_j << close; }
111 };
112
113 inline
json(FILE * s)114 json::json(FILE * s) throw()
115 : _stream(s), _context(_contexts), _flatten(0)
116 {
117 if (good())
118 fflush(s);
119 }
120
121
122 inline
~json()123 json::~json() throw ()
124 {
125 while (_context > _contexts) pop_context();
126 }
127
128 inline
stream()129 FILE * json::stream() const throw() { return _stream; }
130
131
132 inline
133 json & json::operator << (json::_context_t ctxt) throw()
134 {
135 ctxt(*this);
136 return *this;
137 }
138
139 inline
140 json & operator << (json & j, signed char d) throw() { return j << json::integer(d); }
141
142 inline
143 json & operator << (json & j, unsigned char d) throw() { return j << json::integer_u(d); }
144
145 inline
146 json & operator << (json & j, short int d) throw() { return j << json::integer(d); }
147
148 inline
149 json & operator << (json & j, unsigned short int d) throw() { return j << json::integer_u(d); }
150
151 inline
152 json & operator << (json & j, int d) throw() { return j << json::integer(d); }
153
154 inline
155 json & operator << (json & j, unsigned int d) throw() { return j << json::integer_u(d); }
156
157 inline
158 json & operator << (json & j, long int d) throw() { return j << json::integer(d); }
159
160 inline
161 json & operator << (json & j, unsigned long int d) throw() { return j << json::integer_u(d); }
162
163 inline
164 json & operator << (json & j, long long int d) throw() { return j << json::integer(d); }
165
166 inline
167 json & operator << (json & j, unsigned long long int d) throw() { return j << json::integer_u(d); }
168
169 inline
throw()170 json::operator bool() const throw() { return good(); }
171
172 inline
good()173 bool json::good() const throw() { return _stream && ferror(_stream) == 0; }
174
175 inline
eof()176 bool json::eof() const throw() { return feof(_stream) != 0; }
177
178 } // namespace graphite2
179