1 | /* |
2 | Copyright (C) 2011 Joseph A. Adams (joeyadams3.14159@gmail.com) |
3 | All rights reserved. |
4 | |
5 | Permission is hereby granted, free of charge, to any person obtaining a copy |
6 | of this software and associated documentation files (the "Software"), to deal |
7 | in the Software without restriction, including without limitation the rights |
8 | to use, copy, modify, merge, publish, distribute, sublicense, and/or sell |
9 | copies of the Software, and to permit persons to whom the Software is |
10 | furnished to do so, subject to the following conditions: |
11 | |
12 | The above copyright notice and this permission notice shall be included in |
13 | all copies or substantial portions of the Software. |
14 | |
15 | THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
16 | IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
17 | FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE |
18 | AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER |
19 | LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, |
20 | OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN |
21 | THE SOFTWARE. |
22 | */ |
23 | |
24 | #ifndef CCAN_JSON_H |
25 | #define CCAN_JSON_H |
26 | |
27 | #include <stdbool.h> |
28 | #include <stddef.h> |
29 | |
30 | typedef enum { |
31 | JSON_NULL, |
32 | JSON_BOOL, |
33 | JSON_STRING, |
34 | JSON_NUMBER, |
35 | JSON_ARRAY, |
36 | JSON_OBJECT, |
37 | } JsonTag; |
38 | |
39 | typedef struct JsonNode JsonNode; |
40 | |
41 | struct JsonNode |
42 | { |
43 | /* only if parent is an object or array (NULL otherwise) */ |
44 | JsonNode *parent; |
45 | JsonNode *prev, *next; |
46 | |
47 | /* only if parent is an object (NULL otherwise) */ |
48 | char *key; /* Must be valid UTF-8. */ |
49 | |
50 | JsonTag tag; |
51 | union { |
52 | /* JSON_BOOL */ |
53 | bool bool_; |
54 | |
55 | /* JSON_STRING */ |
56 | char *string_; /* Must be valid UTF-8. */ |
57 | |
58 | /* JSON_NUMBER */ |
59 | double number_; |
60 | |
61 | /* JSON_ARRAY */ |
62 | /* JSON_OBJECT */ |
63 | struct { |
64 | JsonNode *head, *tail; |
65 | } children; |
66 | }; |
67 | }; |
68 | |
69 | /*** Encoding, decoding, and validation ***/ |
70 | |
71 | JsonNode *json_decode (const char *json); |
72 | char *json_encode (const JsonNode *node); |
73 | char *json_encode_string (const char *str); |
74 | char *json_stringify (const JsonNode *node, const char *space); |
75 | void json_delete (JsonNode *node); |
76 | |
77 | bool json_validate (const char *json); |
78 | |
79 | /*** Lookup and traversal ***/ |
80 | |
81 | JsonNode *json_find_element (JsonNode *array, int index); |
82 | JsonNode *json_find_member (JsonNode *object, const char *key); |
83 | |
84 | JsonNode *json_first_child (const JsonNode *node); |
85 | |
86 | #define json_foreach(i, object_or_array) \ |
87 | for ((i) = json_first_child(object_or_array); \ |
88 | (i) != NULL; \ |
89 | (i) = (i)->next) |
90 | |
91 | /*** Construction and manipulation ***/ |
92 | |
93 | JsonNode *json_mknull(void); |
94 | JsonNode *json_mkbool(bool b); |
95 | JsonNode *json_mkstring(const char *s); |
96 | JsonNode *json_mknumber(double n); |
97 | JsonNode *json_mkarray(void); |
98 | JsonNode *json_mkobject(void); |
99 | |
100 | void json_append_element(JsonNode *array, JsonNode *element); |
101 | void json_prepend_element(JsonNode *array, JsonNode *element); |
102 | void json_append_member(JsonNode *object, const char *key, JsonNode *value); |
103 | void json_prepend_member(JsonNode *object, const char *key, JsonNode *value); |
104 | |
105 | void json_remove_from_parent(JsonNode *node); |
106 | |
107 | /*** Debugging ***/ |
108 | |
109 | /* |
110 | * Look for structure and encoding problems in a JsonNode or its descendents. |
111 | * |
112 | * If a problem is detected, return false, writing a description of the problem |
113 | * to errmsg (unless errmsg is NULL). |
114 | */ |
115 | bool json_check(const JsonNode *node, char errmsg[256]); |
116 | |
117 | #endif |
118 | |