]>
Commit | Line | Data |
---|---|---|
4a4412b9 | 1 | /* JSON trees |
aeee4812 | 2 | Copyright (C) 2017-2023 Free Software Foundation, Inc. |
4a4412b9 DM |
3 | Contributed by David Malcolm <dmalcolm@redhat.com>. |
4 | ||
5 | This file is part of GCC. | |
6 | ||
7 | GCC is free software; you can redistribute it and/or modify it under | |
8 | the terms of the GNU General Public License as published by the Free | |
9 | Software Foundation; either version 3, or (at your option) any later | |
10 | version. | |
11 | ||
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
15 | for more details. | |
16 | ||
17 | You should have received a copy of the GNU General Public License | |
18 | along with GCC; see the file COPYING3. If not see | |
19 | <http://www.gnu.org/licenses/>. */ | |
20 | ||
21 | #ifndef GCC_JSON_H | |
22 | #define GCC_JSON_H | |
23 | ||
24 | /* Implementation of JSON, a lightweight data-interchange format. | |
25 | ||
26 | See http://www.json.org/ | |
27 | and http://www.ecma-international.org/publications/files/ECMA-ST/ECMA-404.pdf | |
28 | and https://tools.ietf.org/html/rfc7159 | |
29 | ||
30 | Supports creating a DOM-like tree of json::value *, and then dumping | |
31 | json::value * to text. */ | |
32 | ||
33 | namespace json | |
34 | { | |
35 | ||
36 | /* Forward decls of json::value and its subclasses (using indentation | |
37 | to denote inheritance. */ | |
38 | ||
39 | class value; | |
40 | class object; | |
41 | class array; | |
07622278 ML |
42 | class float_number; |
43 | class integer_number; | |
4a4412b9 DM |
44 | class string; |
45 | class literal; | |
46 | ||
47 | /* An enum for discriminating the subclasses of json::value. */ | |
48 | ||
49 | enum kind | |
50 | { | |
51 | /* class json::object. */ | |
52 | JSON_OBJECT, | |
53 | ||
54 | /* class json::array. */ | |
55 | JSON_ARRAY, | |
56 | ||
07622278 ML |
57 | /* class json::integer_number. */ |
58 | JSON_INTEGER, | |
59 | ||
60 | /* class json::float_number. */ | |
61 | JSON_FLOAT, | |
4a4412b9 DM |
62 | |
63 | /* class json::string. */ | |
64 | JSON_STRING, | |
65 | ||
66 | /* class json::literal uses these three values to identify the | |
67 | particular literal. */ | |
68 | JSON_TRUE, | |
69 | JSON_FALSE, | |
70 | JSON_NULL | |
71 | }; | |
72 | ||
73 | /* Base class of JSON value. */ | |
74 | ||
75 | class value | |
76 | { | |
77 | public: | |
78 | virtual ~value () {} | |
79 | virtual enum kind get_kind () const = 0; | |
80 | virtual void print (pretty_printer *pp) const = 0; | |
81 | ||
82 | void dump (FILE *) const; | |
83 | }; | |
84 | ||
7f1e15f7 DM |
85 | /* Subclass of value for objects: a collection of key/value pairs |
86 | preserving the ordering in which keys were inserted. | |
87 | ||
88 | Preserving the order eliminates non-determinism in the output, | |
89 | making it easier for the user to compare repeated invocations. */ | |
4a4412b9 DM |
90 | |
91 | class object : public value | |
92 | { | |
93 | public: | |
94 | ~object (); | |
95 | ||
ff171cb1 DM |
96 | enum kind get_kind () const final override { return JSON_OBJECT; } |
97 | void print (pretty_printer *pp) const final override; | |
4a4412b9 DM |
98 | |
99 | void set (const char *key, value *v); | |
30d3ba51 | 100 | value *get (const char *key) const; |
4a4412b9 DM |
101 | |
102 | private: | |
103 | typedef hash_map <char *, value *, | |
104 | simple_hashmap_traits<nofree_string_hash, value *> > map_t; | |
105 | map_t m_map; | |
7f1e15f7 DM |
106 | |
107 | /* Keep track of order in which keys were inserted. */ | |
108 | auto_vec <const char *> m_keys; | |
4a4412b9 DM |
109 | }; |
110 | ||
111 | /* Subclass of value for arrays. */ | |
112 | ||
113 | class array : public value | |
114 | { | |
115 | public: | |
116 | ~array (); | |
117 | ||
ff171cb1 DM |
118 | enum kind get_kind () const final override { return JSON_ARRAY; } |
119 | void print (pretty_printer *pp) const final override; | |
4a4412b9 | 120 | |
dad2580c | 121 | void append (value *v); |
4a4412b9 DM |
122 | |
123 | private: | |
124 | auto_vec<value *> m_elements; | |
125 | }; | |
126 | ||
07622278 | 127 | /* Subclass of value for floating-point numbers. */ |
4a4412b9 | 128 | |
07622278 | 129 | class float_number : public value |
4a4412b9 DM |
130 | { |
131 | public: | |
07622278 | 132 | float_number (double value) : m_value (value) {} |
4a4412b9 | 133 | |
ff171cb1 DM |
134 | enum kind get_kind () const final override { return JSON_FLOAT; } |
135 | void print (pretty_printer *pp) const final override; | |
4a4412b9 DM |
136 | |
137 | double get () const { return m_value; } | |
138 | ||
139 | private: | |
140 | double m_value; | |
141 | }; | |
142 | ||
07622278 ML |
143 | /* Subclass of value for integer-valued numbers. */ |
144 | ||
145 | class integer_number : public value | |
146 | { | |
147 | public: | |
148 | integer_number (long value) : m_value (value) {} | |
149 | ||
ff171cb1 DM |
150 | enum kind get_kind () const final override { return JSON_INTEGER; } |
151 | void print (pretty_printer *pp) const final override; | |
07622278 ML |
152 | |
153 | long get () const { return m_value; } | |
154 | ||
155 | private: | |
156 | long m_value; | |
157 | }; | |
158 | ||
159 | ||
4a4412b9 DM |
160 | /* Subclass of value for strings. */ |
161 | ||
162 | class string : public value | |
163 | { | |
164 | public: | |
ee08aa9a LH |
165 | explicit string (const char *utf8); |
166 | string (const char *utf8, size_t len); | |
4a4412b9 DM |
167 | ~string () { free (m_utf8); } |
168 | ||
ff171cb1 DM |
169 | enum kind get_kind () const final override { return JSON_STRING; } |
170 | void print (pretty_printer *pp) const final override; | |
4a4412b9 DM |
171 | |
172 | const char *get_string () const { return m_utf8; } | |
ee08aa9a | 173 | size_t get_length () const { return m_len; } |
4a4412b9 DM |
174 | |
175 | private: | |
176 | char *m_utf8; | |
ee08aa9a | 177 | size_t m_len; |
4a4412b9 DM |
178 | }; |
179 | ||
180 | /* Subclass of value for the three JSON literals "true", "false", | |
181 | and "null". */ | |
182 | ||
183 | class literal : public value | |
184 | { | |
185 | public: | |
186 | literal (enum kind kind) : m_kind (kind) {} | |
187 | ||
c8fda30f ML |
188 | /* Construct literal for a boolean value. */ |
189 | literal (bool value): m_kind (value ? JSON_TRUE : JSON_FALSE) {} | |
190 | ||
ff171cb1 DM |
191 | enum kind get_kind () const final override { return m_kind; } |
192 | void print (pretty_printer *pp) const final override; | |
4a4412b9 DM |
193 | |
194 | private: | |
195 | enum kind m_kind; | |
196 | }; | |
197 | ||
198 | } // namespace json | |
199 | ||
200 | #endif /* GCC_JSON_H */ |