2 * Copyright (c) 2009 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.
16 #include "jansson_private.h"
17 #include "strbuffer.h"
20 #define MAX_INTEGER_STR_LENGTH 100
21 #define MAX_REAL_STR_LENGTH 100
23 typedef int (*dump_func)(const char *buffer, int size, void *data);
32 static int dump_to_strbuffer(const char *buffer, int size, void *data)
34 return strbuffer_append_bytes((strbuffer_t *)data, buffer, size);
37 static int dump_to_file(const char *buffer, int size, void *data)
39 FILE *dest = (FILE *)data;
40 if(fwrite(buffer, size, 1, dest) != 1)
45 /* 256 spaces (the maximum indentation size) */
46 static char whitespace[] = " ";
48 static int dump_indent(unsigned long flags, int depth, int space, dump_func dump, void *data)
50 if(JSON_INDENT(flags) > 0)
52 int i, ws_count = JSON_INDENT(flags);
54 if(dump("\n", 1, data))
57 for(i = 0; i < depth; i++)
59 if(dump(whitespace, ws_count, data))
63 else if(space && !(flags & JSON_COMPACT))
65 return dump(" ", 1, data);
70 static int dump_string(const char *str, int ascii, dump_func dump, void *data)
72 const char *pos, *end;
75 if(dump("\"", 1, data))
87 end = utf8_iterate(pos, &codepoint);
91 /* mandatory escape or control char */
92 if(codepoint == '\\' || codepoint == '"' || codepoint < 0x20)
96 if(ascii && codepoint > 0x7F)
103 if(dump(str, pos - str, data))
110 /* handle \, ", and control codes */
114 case '\\': text = "\\\\"; break;
115 case '\"': text = "\\\""; break;
116 case '\b': text = "\\b"; break;
117 case '\f': text = "\\f"; break;
118 case '\n': text = "\\n"; break;
119 case '\r': text = "\\r"; break;
120 case '\t': text = "\\t"; break;
123 /* codepoint is in BMP */
124 if(codepoint < 0x10000)
126 sprintf(seq, "\\u%04x", codepoint);
130 /* not in BMP -> construct a UTF-16 surrogate pair */
135 codepoint -= 0x10000;
136 first = 0xD800 | ((codepoint & 0xffc00) >> 10);
137 last = 0xDC00 | (codepoint & 0x003ff);
139 sprintf(seq, "\\u%04x\\u%04x", first, last);
148 if(dump(text, length, data))
154 return dump("\"", 1, data);
157 static int object_key_cmp(const void *key1, const void *key2)
159 return strcmp(*(const char **)key1, *(const char **)key2);
162 static int do_dump(const json_t *json, unsigned long flags, int depth,
163 dump_func dump, void *data)
165 int ascii = flags & JSON_ENSURE_ASCII ? 1 : 0;
167 switch(json_typeof(json)) {
169 return dump("null", 4, data);
172 return dump("true", 4, data);
175 return dump("false", 5, data);
179 char buffer[MAX_INTEGER_STR_LENGTH];
182 size = snprintf(buffer, MAX_INTEGER_STR_LENGTH, "%d", json_integer_value(json));
183 if(size >= MAX_INTEGER_STR_LENGTH)
186 return dump(buffer, size, data);
191 char buffer[MAX_REAL_STR_LENGTH];
194 size = snprintf(buffer, MAX_REAL_STR_LENGTH, "%.17g",
195 json_real_value(json));
196 if(size >= MAX_REAL_STR_LENGTH)
199 /* Make sure there's a dot or 'e' in the output. Otherwise
200 a real is converted to an integer when decoding */
201 if(strchr(buffer, '.') == NULL &&
202 strchr(buffer, 'e') == NULL)
204 if(size + 2 >= MAX_REAL_STR_LENGTH) {
205 /* No space to append ".0" */
209 buffer[size + 1] = '0';
213 return dump(buffer, size, data);
217 return dump_string(json_string_value(json), ascii, dump, data);
225 /* detect circular references */
226 array = json_to_array(json);
231 n = json_array_size(json);
233 if(dump("[", 1, data))
236 return dump("]", 1, data);
237 if(dump_indent(flags, depth + 1, 0, dump, data))
240 for(i = 0; i < n; ++i) {
241 if(do_dump(json_array_get(json, i), flags, depth + 1,
247 if(dump(",", 1, data) ||
248 dump_indent(flags, depth + 1, 1, dump, data))
253 if(dump_indent(flags, depth, 0, dump, data))
259 return dump("]", 1, data);
264 json_object_t *object;
266 const char *separator;
267 int separator_length;
269 if(flags & JSON_COMPACT) {
271 separator_length = 1;
275 separator_length = 2;
278 /* detect circular references */
279 object = json_to_object(json);
284 iter = json_object_iter((json_t *)json);
286 if(dump("{", 1, data))
289 return dump("}", 1, data);
290 if(dump_indent(flags, depth + 1, 0, dump, data))
293 if(flags & JSON_SORT_KEYS)
301 size = json_object_size(json);
302 keys = malloc(size * sizeof(const char *));
309 keys[i] = json_object_iter_key(iter);
310 iter = json_object_iter_next((json_t *)json, iter);
315 qsort(keys, size, sizeof(const char *), object_key_cmp);
317 for(i = 0; i < size; i++)
323 value = json_object_get(json, key);
326 dump_string(key, ascii, dump, data);
327 if(dump(separator, separator_length, data) ||
328 do_dump(value, flags, depth + 1, dump, data))
336 if(dump(",", 1, data) ||
337 dump_indent(flags, depth + 1, 1, dump, data))
345 if(dump_indent(flags, depth, 0, dump, data))
357 /* Don't sort keys */
361 void *next = json_object_iter_next((json_t *)json, iter);
363 dump_string(json_object_iter_key(iter), ascii, dump, data);
364 if(dump(separator, separator_length, data) ||
365 do_dump(json_object_iter_value(iter), flags, depth + 1,
371 if(dump(",", 1, data) ||
372 dump_indent(flags, depth + 1, 1, dump, data))
377 if(dump_indent(flags, depth, 0, dump, data))
386 return dump("}", 1, data);
396 char *json_dumps(const json_t *json, unsigned long flags)
401 if(!json_is_array(json) && !json_is_object(json))
404 if(strbuffer_init(&strbuff))
407 if(do_dump(json, flags, 0, dump_to_strbuffer, (void *)&strbuff)) {
408 strbuffer_close(&strbuff);
412 result = strdup(strbuffer_value(&strbuff));
413 strbuffer_close(&strbuff);
418 int json_dumpf(const json_t *json, FILE *output, unsigned long flags)
420 if(!json_is_array(json) && !json_is_object(json))
423 return do_dump(json, flags, 0, dump_to_file, (void *)output);
426 int json_dump_file(const json_t *json, const char *path, unsigned long flags)
430 FILE *output = fopen(path, "w");
434 result = json_dumpf(json, output, flags);