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
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
|
/*
Copyright (C) 2016-2017 Alexander Borisov
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
Author: lex.borisov@gmail.com (Alexander Borisov)
Author: https://github.com/EmielBruijntjes (Emiel Bruijntjes)
*/
#include "myhtml/serialization.h"
/**
* Forward declaration of all the functions that are used inside this module
*/
static mystatus_t myhtml_serialization_append(const char* str, size_t size, mycore_callback_serialize_f callback, void *ptr);
static mystatus_t myhtml_serialization_append_attr(const char* str, size_t length, mycore_callback_serialize_f callback, void *ptr);
static mystatus_t myhtml_serialization_attributes(myhtml_tree_t* tree, myhtml_tree_attr_t* attr, mycore_callback_serialize_f callback, void *ptr);
static mystatus_t myhtml_serialization_node_append_text_node(myhtml_tree_node_t* node, mycore_callback_serialize_f callback, void *ptr);
static mystatus_t myhtml_serialization_node_append_close(myhtml_tree_node_t* node, mycore_callback_serialize_f callback, void *ptr);
/**
* See the function myhtml_serialization_tree_buffer
*/
mystatus_t myhtml_serialization(myhtml_tree_node_t* scope_node, mycore_string_raw_t* str)
{
return myhtml_serialization_tree_buffer(scope_node, str);
}
/**
* See the function myhtml_serialization_node_buffer
*/
mystatus_t myhtml_serialization_node(myhtml_tree_node_t* node, mycore_string_raw_t* str)
{
return myhtml_serialization_node_buffer(node, str);
}
/**
* The serialize function for an entire tree
* @param tree the tree to be serialized
* @param scope_node the scope_node
* @param callback function that will be called for all strings that have to be printed
* @param ptr user-supplied pointer
* @return bool
*/
mystatus_t myhtml_serialization_tree_callback(myhtml_tree_node_t* scope_node, mycore_callback_serialize_f callback, void *ptr)
{
myhtml_tree_node_t* node = scope_node;
/*
Document node it is a root node of tree, it is not a tag element.
For HTML, the root element will always be <HTML> tag.
It is always present in the HTML document and it always a root of HTML document.
*/
if(scope_node && scope_node->tree && scope_node->tree->document == scope_node) {
node = scope_node->child;
}
while(node) {
if(myhtml_serialization_node_callback(node, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(node->child)
node = node->child;
else {
while(node != scope_node && node->next == NULL) {
if(myhtml_serialization_node_append_close(node, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
node = node->parent;
}
if(node == scope_node) {
if(node != node->tree->document) {
if(myhtml_serialization_node_append_close(node, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
break;
}
if(myhtml_serialization_node_append_close(node, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
node = node->next;
}
}
return MyCORE_STATUS_OK;
}
/**
* The serialize function for a single node
* @param tree the tree to be serialized
* @param node the node that is going to be serialized
* @param callback function that will be called for all strings that have to be printed
* @param ptr user-supplied pointer
* @return bool
*/
mystatus_t myhtml_serialization_node_callback(myhtml_tree_node_t* node, mycore_callback_serialize_f callback, void *ptr)
{
switch (node->tag_id) {
case MyHTML_TAG__TEXT: {
if(myhtml_serialization_node_append_text_node(node, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
case MyHTML_TAG__COMMENT: {
if(callback("<!--", 4, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(node->token && node->token->str.data) {
if(callback(node->token->str.data, node->token->str.length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("-->", 3, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
case MyHTML_TAG__DOCTYPE: {
if(callback("<!DOCTYPE", 9, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback(" ", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(node->token) {
myhtml_tree_attr_t* attr = node->token->attr_first;
if(attr && attr->key.data && attr->key.length) {
if(callback(attr->key.data, attr->key.length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
attr = attr->next;
if(attr) {
myhtml_tree_attr_t *system_id = NULL, *public_id = NULL;
if(attr->value.length == 6) {
if(mycore_strcasecmp(attr->value.data, "SYSTEM") == 0) {
system_id = attr->next;
} else if(mycore_strcasecmp(attr->value.data, "PUBLIC") == 0) {
public_id = attr->next;
system_id = public_id ? public_id->next : NULL;
}
}
if(public_id && public_id->value.length > 0) {
if(callback(" PUBLIC \"", 9, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback(public_id->value.data, public_id->value.length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback("\"", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(system_id && system_id->value.length > 0) {
if(!public_id || public_id->value.length == 0) {
if(callback(" SYSTEM", 7, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(" \"", 2, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(system_id->value.data && system_id->value.length) {
if(callback(system_id->value.data, system_id->value.length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("\"", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
}
}
}
if(callback(">", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
default: {
size_t length;
const char *tag = myhtml_tag_name_by_id(node->tree, node->tag_id, &length);
if(callback("<", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback(tag, length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(node->token) {
if(myhtml_serialization_attributes(node->tree, node->token->attr_first, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(">", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
}
return MyCORE_STATUS_OK;
}
/**
* Internal function to process attributes
* @param tree
* @param attr
* @param callback
* @param ptr
*/
mystatus_t myhtml_serialization_attributes(myhtml_tree_t* tree, myhtml_tree_attr_t* attr, mycore_callback_serialize_f callback, void* ptr)
{
while(attr) {
if(callback(" ", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
switch (attr->ns) {
case MyHTML_NAMESPACE_XML:
if(callback("xml:", 4, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
case MyHTML_NAMESPACE_XMLNS: {
/*
If the attribute is in the XMLNS namespace and the attribute's local name is not xmlns
The attribute's serialized name is the string "xmlns:" followed by the attribute's local name.
*/
if(attr->key.data && attr->key.length == 5 && mycore_strcmp(attr->key.data, "xmlns")) {
if(callback("xmlns:", 6, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
break;
}
case MyHTML_NAMESPACE_XLINK: {
if(callback("xlink:", 6, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
default:
break;
}
size_t length;
const char *data = myhtml_attribute_key(attr, &length);
if(data) {
if(callback(data, length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("=\"", 2, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
data = myhtml_attribute_value(attr, &length);
if(data) {
if(myhtml_serialization_append_attr(data, length, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("\"", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
attr = attr->next;
}
return MyCORE_STATUS_OK;
}
/**
* Internal function to process a close tag
* @param tree
* @param node
* @param callback
* @param ptr
*/
mystatus_t myhtml_serialization_node_append_close(myhtml_tree_node_t* node, mycore_callback_serialize_f callback, void* ptr)
{
switch (node->tag_id) {
case MyHTML_TAG__TEXT:
case MyHTML_TAG__COMMENT:
case MyHTML_TAG__DOCTYPE:
return MyCORE_STATUS_OK;
// https://html.spec.whatwg.org/multipage/parsing.html#serialising-html-fragments
case MyHTML_TAG_AREA:
case MyHTML_TAG_BASE:
case MyHTML_TAG_BGSOUND:
case MyHTML_TAG_BR:
case MyHTML_TAG_COL:
case MyHTML_TAG_EMBED:
case MyHTML_TAG_FRAME:
case MyHTML_TAG_HR:
case MyHTML_TAG_IMG:
case MyHTML_TAG_INPUT:
case MyHTML_TAG_KEYGEN:
case MyHTML_TAG_LINK:
case MyHTML_TAG_META:
case MyHTML_TAG_PARAM:
case MyHTML_TAG_SOURCE:
case MyHTML_TAG_TRACK:
case MyHTML_TAG_WBR:
if(node->ns == MyHTML_NAMESPACE_HTML)
return MyCORE_STATUS_OK;
break;
}
size_t length;
const char *tag = myhtml_tag_name_by_id(node->tree, node->tag_id, &length);
if(callback("</", 2, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback(tag, length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
if(callback(">", 1, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
return MyCORE_STATUS_OK;
}
/**
* Internal function to process a text node
* @param tree
* @param node
* @param callback
* @param ptr
*/
mystatus_t myhtml_serialization_node_append_text_node(myhtml_tree_node_t* node, mycore_callback_serialize_f callback, void* ptr)
{
if(node->token == NULL || node->token->str.data == NULL) return MyCORE_STATUS_OK;
if(node->parent == NULL) {
if(myhtml_serialization_append(node->token->str.data, node->token->str.length, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
return MyCORE_STATUS_OK;
}
switch (node->parent->tag_id) {
case MyHTML_TAG_STYLE:
case MyHTML_TAG_SCRIPT:
case MyHTML_TAG_XMP:
case MyHTML_TAG_IFRAME:
case MyHTML_TAG_NOEMBED:
case MyHTML_TAG_NOFRAMES:
case MyHTML_TAG_PLAINTEXT:
if(callback(node->token->str.data, node->token->str.length, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
default:
if(myhtml_serialization_append(node->token->str.data, node->token->str.length, callback, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
break;
}
return MyCORE_STATUS_OK;
}
/**
* Internal method to process a buffer that could contain to-be-quoted output
* @param data
* @param size
* @param callback
* @param ptr
*/
mystatus_t myhtml_serialization_append(const char *data, size_t size, mycore_callback_serialize_f callback, void* ptr)
{
// number of chars not yet displayed
size_t notwritten = 0;
// iterate over the buffer
for (size_t i = 0; i < size; ++i) {
switch ((unsigned char)data[i]) {
case '&':
if(notwritten) {
if(callback(data + i - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("&", 5, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
break;
case '<':
if(notwritten) {
if(callback(data + i - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("<", 4, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
break;
case '>':
if(notwritten) {
if(callback(data + i - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(">", 4, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
break;
case 0xA0:
if(i > 0 && (unsigned char)(data[(i - 1)]) == 0xC2) {
if(notwritten) {
if(callback(data + i - notwritten, (notwritten - 1), ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(" ", 6, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
}
else {
++notwritten;
}
break;
default:
++notwritten;
break;
}
}
if(notwritten)
if(callback(data + size - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
return MyCORE_STATUS_OK;
}
/**
* Internal method to process an attribute
* @param data
* @param size
* @param callback
* @param ptr
*/
mystatus_t myhtml_serialization_append_attr(const char* data, size_t size, mycore_callback_serialize_f callback, void* ptr)
{
// number of chars not yet displayed
size_t notwritten = 0;
// iterate over the buffer
for (size_t i = 0; i < size; ++i) {
switch ((unsigned char)data[i]) {
case '&':
if(notwritten) {
if(callback(data + i - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback("&", 5, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
break;
case '"':
if(notwritten) {
if(callback(data + i - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(""", 6, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
break;
case 0xA0:
if(i > 0 && (unsigned char)(data[(i - 1)]) == 0xC2) {
if(notwritten) {
if(callback(data + i - notwritten, (notwritten - 1), ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
if(callback(" ", 6, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
notwritten = 0;
}
else {
++notwritten;
}
break;
default:
++notwritten;
break;
}
}
if(notwritten) {
if(callback(data + size - notwritten, notwritten, ptr))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
return MyCORE_STATUS_OK;
}
/**
* Reallocate the buffer
* @param str the buffer to reallocate
* @param size new size
*/
mystatus_t myhtml_serialization_reallocate(mycore_string_raw_t *str, size_t size)
{
// construct a buffer
char *data = (char*)mycore_realloc(str->data, size * sizeof(char));
// was it ok?
if(data == NULL) {
memset(str, 0, sizeof(mycore_string_raw_t));
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
else {
// reallocation succeeded
str->data = data;
str->size = size;
}
return MyCORE_STATUS_OK;
}
/**
* Implementation of the mycore_callback_serialize_f function for internal
* use that concatenats everything to a string
* @param data
* @param size
*/
mystatus_t myhtml_serialization_concatenate(const char* data, size_t length, void *ptr)
{
mycore_string_raw_t *str = (mycore_string_raw_t*)ptr;
// do we still have enough size in the output buffer?
if ((length + str->length) >= str->size) {
if(myhtml_serialization_reallocate(str, length + str->length + 4096))
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
// copy data
strncpy(&str->data[ str->length ], data, length);
// update counters
str->length += length;
str->data[ str->length ] = '\0';
return MyCORE_STATUS_OK;
}
/**
* Serialize tree to an output string
* @param tree
* @param scope_node
* @param str
* @return bool
*/
mystatus_t myhtml_serialization_tree_buffer(myhtml_tree_node_t* scope_node, mycore_string_raw_t* str) {
// we need an output variable
if(str == NULL) return false;
// allocate space that is most likely enough for the output
if(str->data == NULL) {
str->size = 4098 * 5;
str->length = 0;
str->data = (char*)mycore_malloc(str->size * sizeof(char));
if(str->data == NULL) {
str->size = 0;
return MyCORE_STATUS_ERROR_MEMORY_ALLOCATION;
}
}
return myhtml_serialization_tree_callback(scope_node, myhtml_serialization_concatenate, str);
}
/**
* Serialize node to an output string
* @param tree
* @param node
* @param str
* @return bool
*/
mystatus_t myhtml_serialization_node_buffer(myhtml_tree_node_t* node, mycore_string_raw_t* str) {
// we need an output variable
if(str == NULL) return false;
// allocate space that is most likely enough for the output
if(str->data == NULL) {
str->size = 2048;
str->length = 0;
str->data = (char*)mycore_malloc(str->size * sizeof(char));
if(str->data == NULL) {
str->size = 0;
return false;
}
}
return myhtml_serialization_node_callback(node, myhtml_serialization_concatenate, str);
}
|
