summaryrefslogtreecommitdiff
path: root/yajl/yajl_gen.c
blob: 17ce0032ec3c8548854a8954ca13b99ab8c28e70 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/*
 * Copyright (c) 2007-2014, Lloyd Hilaiel <me@lloyd.io>
 *
 * Permission to use, copy, modify, and/or distribute this software for any
 * purpose with or without fee is hereby granted, provided that the above
 * copyright notice and this permission notice appear in all copies.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 */

#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <math.h>
#include <stdarg.h>

#include "yajl_gen.h"
#include "yajl_buf.h"
#include "yajl_encode.h"

typedef enum {
    yajl_gen_start,
    yajl_gen_map_start,
    yajl_gen_map_key,
    yajl_gen_map_val,
    yajl_gen_array_start,
    yajl_gen_in_array,
    yajl_gen_complete,
    yajl_gen_error
} yajl_gen_state;

struct yajl_gen_t
{
    unsigned int flags;
    unsigned int depth;
    const char * indentString;
    yajl_gen_state state[YAJL_MAX_DEPTH];
    yajl_print_t print;
    void * ctx; /* yajl_buf */
    unsigned char *pendingComment;
    unsigned int pendingLen;            /* Length of pending comment */
    int pendingCpp;                     /* NZ if comment is C++ style, Z if C */
    /* memory allocation routines */
    yajl_alloc_funcs alloc;
};

int
yajl_gen_config(yajl_gen g, yajl_gen_option opt, ...)
{
    int rv = 1;
    va_list ap;
    va_start(ap, opt);

    switch(opt) {
        case yajl_gen_beautify:
        case yajl_gen_validate_utf8:
        case yajl_gen_escape_solidus:
            if (va_arg(ap, int)) g->flags |= opt;
            else g->flags &= ~opt;
            break;
        case yajl_gen_indent_string: {
            const char *indent = va_arg(ap, const char *);
            g->indentString = indent;
            for (; *indent; indent++) {
                if (*indent != '\n'
                    && *indent != '\v'
                    && *indent != '\f'
                    && *indent != '\t'
                    && *indent != '\r'
                    && *indent != ' ')
                {
                    g->indentString = NULL;
                    rv = 0;
                }
            }
            break;
        }
        case yajl_gen_print_callback:
            yajl_buf_free(g->ctx);
            g->print = va_arg(ap, const yajl_print_t);
            g->ctx = va_arg(ap, void *);
            break;
        default:
            rv = 0;
    }

    va_end(ap);

    return rv;
}



yajl_gen
yajl_gen_alloc(const yajl_alloc_funcs * afs)
{
    yajl_gen g = NULL;
    yajl_alloc_funcs afsBuffer;

    /* first order of business is to set up memory allocation routines */
    if (afs != NULL) {
        if (afs->malloc == NULL || afs->realloc == NULL || afs->free == NULL)
        {
            return NULL;
        }
    } else {
        yajl_set_default_alloc_funcs(&afsBuffer);
        afs = &afsBuffer;
    }

    g = (yajl_gen) YA_MALLOC(afs, sizeof(struct yajl_gen_t));
    if (!g) return NULL;

    memset((void *) g, 0, sizeof(struct yajl_gen_t));
    /* copy in pointers to allocation routines */
    memcpy((void *) &(g->alloc), (void *) afs, sizeof(yajl_alloc_funcs));

    g->print = (yajl_print_t)&yajl_buf_append;
    g->ctx = yajl_buf_alloc(&(g->alloc));
    g->indentString = "    ";

    return g;
}

void
yajl_gen_reset(yajl_gen g, const char * sep)
{
    g->depth = 0;
    memset((void *) &(g->state), 0, sizeof(g->state));
    if (sep != NULL) g->print(g->ctx, sep, strlen(sep));
}

void
yajl_gen_free(yajl_gen g)
{
    if (g->print == (yajl_print_t)&yajl_buf_append) yajl_buf_free((yajl_buf)g->ctx);
    YA_FREE(&(g->alloc), g);
}

#define INSERT_EOL                                                          \
    if ((g->flags & yajl_gen_beautify) || g->pendingComment != NULL)        \
        yajl_insert_eol(g);

#define INSERT_SEP \
    if (g->state[g->depth] == yajl_gen_map_key ||               \
        g->state[g->depth] == yajl_gen_in_array) {              \
        g->print(g->ctx, ",", 1);                               \
		INSERT_EOL;                                             \
    } else if (g->state[g->depth] == yajl_gen_map_val) {        \
        g->print(g->ctx, ":", 1);                               \
        if ((g->flags & yajl_gen_beautify)) g->print(g->ctx, " ", 1); \
   }

#define INSERT_WHITESPACE                                               \
    if ((g->flags & yajl_gen_beautify)) {                               \
        if (g->state[g->depth] != yajl_gen_map_val) {                   \
            unsigned int _i;                                            \
            for (_i=0;_i<g->depth;_i++)                                 \
                g->print(g->ctx,                                        \
                         g->indentString,                               \
                         (unsigned int)strlen(g->indentString));        \
        }                                                               \
    }

#define INSERT_SOME_WHITESPACE                                          \
    if ((g->flags & yajl_gen_beautify)) {                               \
        if (g->state[g->depth] != yajl_gen_map_val) {                   \
            g->print(g->ctx,                                            \
                     g->indentString,                                   \
                     (unsigned int)strlen(g->indentString));            \
        }                                                               \
    }

#define ENSURE_NOT_KEY \
    if (g->state[g->depth] == yajl_gen_map_key ||       \
        g->state[g->depth] == yajl_gen_map_start)  {    \
        return yajl_gen_keys_must_be_strings;           \
    }                                                   \

/* check that we're not complete, or in error state.  in a valid state
 * to be generating */
#define ENSURE_VALID_STATE \
    if (g->state[g->depth] == yajl_gen_error) {   \
        return yajl_gen_in_error_state;\
    } else if (g->state[g->depth] == yajl_gen_complete) {   \
        return yajl_gen_generation_complete;                \
    }

#define INCREMENT_DEPTH \
    if (++(g->depth) >= YAJL_MAX_DEPTH) return yajl_max_depth_exceeded;

#define DECREMENT_DEPTH \
  if (--(g->depth) >= YAJL_MAX_DEPTH) return yajl_gen_generation_complete;

#define APPENDED_ATOM \
    switch (g->state[g->depth]) {                   \
        case yajl_gen_start:                        \
            g->state[g->depth] = yajl_gen_complete; \
            break;                                  \
        case yajl_gen_map_start:                    \
        case yajl_gen_map_key:                      \
            g->state[g->depth] = yajl_gen_map_val;  \
            break;                                  \
        case yajl_gen_array_start:                  \
            g->state[g->depth] = yajl_gen_in_array; \
            break;                                  \
        case yajl_gen_map_val:                      \
            g->state[g->depth] = yajl_gen_map_key;  \
            break;                                  \
        default:                                    \
            break;                                  \
    }                                               \

#define FINAL_NEWLINE                               \
    if (g->state[g->depth] == yajl_gen_complete)    \
		INSERT_EOL

/* Insert an end of line, and take care of any */
/* pending comments */
static void yajl_insert_eol(yajl_gen g) {
    if (g->pendingComment != NULL) {
        INSERT_SOME_WHITESPACE;
        if (g->pendingCpp)
            g->print(g->ctx, "//", 2);
        else
            g->print(g->ctx, "/*", 2);
        yajl_string_encode(g->print, g->ctx, g->pendingComment, g->pendingLen,
		                                   g->flags & yajl_gen_escape_solidus);
        if (!g->pendingCpp)
            g->print(g->ctx, "*/", 2);
        free(g->pendingComment);
        g->pendingComment = NULL;
        g->pendingLen = 0;
        g->pendingCpp = 0;
    }
    g->print(g->ctx, "\n", 1);
}

/* Insert a comment at the end of the line. Append if there is already */
/* one pending. */
static void yajl_insert_pending_comment(
yajl_gen g, const unsigned char * str, unsigned int len, int cpp) {
    if (g->pendingComment != NULL) {
        unsigned int tlen = g->pendingLen + 0 + len;
        unsigned char *pendingComment;
        pendingComment = (unsigned char *) realloc(g->pendingComment, sizeof(char) * tlen);
        memcpy(pendingComment + g->pendingLen + 0, str, len);
        g->pendingComment = pendingComment;
        g->pendingLen = tlen;
    } else {
        g->pendingComment = (unsigned char *) malloc(sizeof(char) * len);
        memcpy(g->pendingComment, str, len);
        g->pendingLen = len;
    }
    g->pendingCpp = cpp;
}

yajl_gen_status
yajl_gen_integer(yajl_gen g, longlong number)
{
    char i[32];
    ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    sprintf(i, "%lld", number);
    g->print(g->ctx, i, (unsigned int)strlen(i));
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

#if (defined(_WIN32) || defined(WIN32)) && !defined(__GNUC__)
#include <float.h>
#define isnan _isnan
#define isinf !_finite
#endif

yajl_gen_status
yajl_gen_double(yajl_gen g, double number)
{
    char i[32];
    ENSURE_VALID_STATE; ENSURE_NOT_KEY;
    if (isnan(number) || isinf(number)) return yajl_gen_invalid_number;
    INSERT_SEP; INSERT_WHITESPACE;
    sprintf(i, "%.20g", number);
    if (strspn(i, "0123456789-") == strlen(i)) {
        strcat(i, ".0");
    }
    g->print(g->ctx, i, (unsigned int)strlen(i));
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_number(yajl_gen g, const char * s, size_t l)
{
    ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    g->print(g->ctx, s, l);
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_string(yajl_gen g, const unsigned char * str,
                size_t len)
{
    // if validation is enabled, check that the string is valid utf8
    // XXX: This checking could be done a little faster, in the same pass as
    // the string encoding
    if (g->flags & yajl_gen_validate_utf8) {
        if (!yajl_string_validate_utf8(str, len)) {
            return yajl_gen_invalid_string;
        }
    }
    ENSURE_VALID_STATE; INSERT_SEP; INSERT_WHITESPACE;
    g->print(g->ctx, "\"", 1);
    yajl_string_encode(g->print, g->ctx, str, len, g->flags & yajl_gen_escape_solidus);
    g->print(g->ctx, "\"", 1);
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_null(yajl_gen g)
{
    ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    g->print(g->ctx, "null", strlen("null"));
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_bool(yajl_gen g, int boolean)
{
    const char * val = boolean ? "true" : "false";

	ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    g->print(g->ctx, val, (unsigned int)strlen(val));
    APPENDED_ATOM;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_map_open(yajl_gen g)
{
    ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    INCREMENT_DEPTH;

    g->state[g->depth] = yajl_gen_map_start;
    g->print(g->ctx, "{", 1);
	INSERT_EOL;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_map_close(yajl_gen g)
{
    ENSURE_VALID_STATE;
    DECREMENT_DEPTH;

	INSERT_EOL;
    APPENDED_ATOM;
    INSERT_WHITESPACE;
    g->print(g->ctx, "}", 1);
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_array_open(yajl_gen g)
{
    ENSURE_VALID_STATE; ENSURE_NOT_KEY; INSERT_SEP; INSERT_WHITESPACE;
    INCREMENT_DEPTH;
    g->state[g->depth] = yajl_gen_array_start;
    g->print(g->ctx, "[", 1);
	INSERT_EOL;
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_array_close(yajl_gen g)
{
    ENSURE_VALID_STATE;
    DECREMENT_DEPTH;
	INSERT_EOL;
    APPENDED_ATOM;
    INSERT_WHITESPACE;
    g->print(g->ctx, "]", 1);
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_c_comment(yajl_gen g, const unsigned char * str,
                unsigned int len, int dlytoeol)
{
    ENSURE_VALID_STATE;
    if (dlytoeol) {
        yajl_insert_pending_comment(g, str, len, 0);
    } else {
        if ((g->flags & yajl_gen_beautify))
            g->print(g->ctx, " /*", 3);
        else
            g->print(g->ctx, "/*", 2);
        yajl_string_encode(g->print, g->ctx, str, len, g->flags & yajl_gen_escape_solidus);
        if ((g->flags & yajl_gen_beautify))
            g->print(g->ctx, "*/ ", 3);
        else
            g->print(g->ctx, "*/", 2);
    }
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_cpp_comment(yajl_gen g, const unsigned char * str,
                unsigned int len)
{
    ENSURE_VALID_STATE;
    yajl_insert_pending_comment(g, str, len, 1);
    FINAL_NEWLINE;
    return yajl_gen_status_ok;
}

yajl_gen_status
yajl_gen_get_buf(yajl_gen g, const unsigned char ** buf,
                 size_t * len)
{
    if (g->print != (yajl_print_t)&yajl_buf_append) return yajl_gen_no_buf;
    *buf = yajl_buf_data((yajl_buf)g->ctx);
    *len = yajl_buf_len((yajl_buf)g->ctx);
    return yajl_gen_status_ok;
}

void
yajl_gen_clear(yajl_gen g)
{
    if (g->print == (yajl_print_t)&yajl_buf_append) yajl_buf_clear((yajl_buf)g->ctx);
}