2 * Copyright (c) 2009, 2010 Petri Lehtinen <petri@digip.org>
4 * Jansson is free software; you can redistribute it and/or modify
5 * it under the terms of the MIT license. See LICENSE for details.
15 #include "jansson_private.h"
16 #include "strbuffer.h"
19 #define MAX_INTEGER_STR_LENGTH 100
20 #define MAX_REAL_STR_LENGTH 100
22 typedef int (*dump_func)(const char *buffer, int size, void *data);
31 static int dump_to_strbuffer(const char *buffer, int size, void *data)
33 return strbuffer_append_bytes((strbuffer_t *)data, buffer, size);
36 static int dump_to_file(const char *buffer, int size, void *data)
38 FILE *dest = (FILE *)data;
39 if(fwrite(buffer, size, 1, dest) != 1)
44 /* 256 spaces (the maximum indentation size) */
45 static char whitespace[] = " ";
47 static int dump_indent(unsigned long flags, int depth, int space, dump_func dump, void *data)
49 if(JSON_INDENT(flags) > 0)
51 int i, ws_count = JSON_INDENT(flags);
53 if(dump("\n", 1, data))
56 for(i = 0; i < depth; i++)
58 if(dump(whitespace, ws_count, data))
62 else if(space && !(flags & JSON_COMPACT))
64 return dump(" ", 1, data);
69 static int dump_string(const char *str, int ascii, dump_func dump, void *data)
71 const char *pos, *end;
74 if(dump("\"", 1, data))
86 end = utf8_iterate(pos, &codepoint);
90 /* mandatory escape or control char */
91 if(codepoint == '\\' || codepoint == '"' || codepoint < 0x20)
95 if(ascii && codepoint > 0x7F)
102 if(dump(str, pos - str, data))
109 /* handle \, ", and control codes */
113 case '\\': text = "\\\\"; break;
114 case '\"': text = "\\\""; break;
115 case '\b': text = "\\b"; break;
116 case '\f': text = "\\f"; break;
117 case '\n': text = "\\n"; break;
118 case '\r': text = "\\r"; break;
119 case '\t': text = "\\t"; break;
122 /* codepoint is in BMP */
123 if(codepoint < 0x10000)
125 sprintf(seq, "\\u%04x", codepoint);
129 /* not in BMP -> construct a UTF-16 surrogate pair */
134 codepoint -= 0x10000;
135 first = 0xD800 | ((codepoint & 0xffc00) >> 10);
136 last = 0xDC00 | (codepoint & 0x003ff);
138 sprintf(seq, "\\u%04x\\u%04x", first, last);
147 if(dump(text, length, data))
153 return dump("\"", 1, data);
156 static int object_key_cmp(const void *key1, const void *key2)
158 return strcmp(*(const char **)key1, *(const char **)key2);
161 static int do_dump(const json_t *json, unsigned long flags, int depth,
162 dump_func dump, void *data)
164 int ascii = flags & JSON_ENSURE_ASCII ? 1 : 0;
166 switch(json_typeof(json)) {
168 return dump("null", 4, data);
171 return dump("true", 4, data);
174 return dump("false", 5, data);
178 char buffer[MAX_INTEGER_STR_LENGTH];
181 size = snprintf(buffer, MAX_INTEGER_STR_LENGTH, "%d", json_integer_value(json));
182 if(size >= MAX_INTEGER_STR_LENGTH)
185 return dump(buffer, size, data);
190 char buffer[MAX_REAL_STR_LENGTH];
193 size = snprintf(buffer, MAX_REAL_STR_LENGTH, "%.17g",
194 json_real_value(json));
195 if(size >= MAX_REAL_STR_LENGTH)
198 /* Make sure there's a dot or 'e' in the output. Otherwise
199 a real is converted to an integer when decoding */
200 if(strchr(buffer, '.') == NULL &&
201 strchr(buffer, 'e') == NULL)
203 if(size + 2 >= MAX_REAL_STR_LENGTH) {
204 /* No space to append ".0" */
208 buffer[size + 1] = '0';
212 return dump(buffer, size, data);
216 return dump_string(json_string_value(json), ascii, dump, data);
224 /* detect circular references */
225 array = json_to_array(json);
230 n = json_array_size(json);
232 if(dump("[", 1, data))
235 return dump("]", 1, data);
236 if(dump_indent(flags, depth + 1, 0, dump, data))
239 for(i = 0; i < n; ++i) {
240 if(do_dump(json_array_get(json, i), flags, depth + 1,
246 if(dump(",", 1, data) ||
247 dump_indent(flags, depth + 1, 1, dump, data))
252 if(dump_indent(flags, depth, 0, dump, data))
258 return dump("]", 1, data);
263 json_object_t *object;
265 const char *separator;
266 int separator_length;
268 if(flags & JSON_COMPACT) {
270 separator_length = 1;
274 separator_length = 2;
277 /* detect circular references */
278 object = json_to_object(json);
283 iter = json_object_iter((json_t *)json);
285 if(dump("{", 1, data))
288 return dump("}", 1, data);
289 if(dump_indent(flags, depth + 1, 0, dump, data))
292 if(flags & JSON_SORT_KEYS)
300 size = json_object_size(json);
301 keys = malloc(size * sizeof(const char *));
308 keys[i] = json_object_iter_key(iter);
309 iter = json_object_iter_next((json_t *)json, iter);
314 qsort(keys, size, sizeof(const char *), object_key_cmp);
316 for(i = 0; i < size; i++)
322 value = json_object_get(json, key);
325 dump_string(key, ascii, dump, data);
326 if(dump(separator, separator_length, data) ||
327 do_dump(value, flags, depth + 1, dump, data))
335 if(dump(",", 1, data) ||
336 dump_indent(flags, depth + 1, 1, dump, data))
344 if(dump_indent(flags, depth, 0, dump, data))
356 /* Don't sort keys */
360 void *next = json_object_iter_next((json_t *)json, iter);
362 dump_string(json_object_iter_key(iter), ascii, dump, data);
363 if(dump(separator, separator_length, data) ||
364 do_dump(json_object_iter_value(iter), flags, depth + 1,
370 if(dump(",", 1, data) ||
371 dump_indent(flags, depth + 1, 1, dump, data))
376 if(dump_indent(flags, depth, 0, dump, data))
385 return dump("}", 1, data);
395 char *json_dumps(const json_t *json, unsigned long flags)
400 if(!json_is_array(json) && !json_is_object(json))
403 if(strbuffer_init(&strbuff))
406 if(do_dump(json, flags, 0, dump_to_strbuffer, (void *)&strbuff)) {
407 strbuffer_close(&strbuff);
411 result = strdup(strbuffer_value(&strbuff));
412 strbuffer_close(&strbuff);
417 int json_dumpf(const json_t *json, FILE *output, unsigned long flags)
419 if(!json_is_array(json) && !json_is_object(json))
422 return do_dump(json, flags, 0, dump_to_file, (void *)output);
425 int json_dump_file(const json_t *json, const char *path, unsigned long flags)
429 FILE *output = fopen(path, "w");
433 result = json_dumpf(json, output, flags);