summaryrefslogtreecommitdiff
path: root/css/css.c
blob: 0c0a4f560183987524620ca5cb5ed0cc1b018030 (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
/*
 * Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
 *
 * This file is part of NetSurf, http://www.netsurf-browser.org/
 *
 * NetSurf is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; version 2 of the License.
 *
 * NetSurf 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <assert.h>

#include <libwapcaplet/libwapcaplet.h>

#include "content/content_protected.h"
#include "content/fetch.h"
#include "content/hlcache.h"
#include "css/css.h"
#include "css/internal.h"
#include "desktop/gui.h"
#include "render/html.h"
#include "utils/http.h"
#include "utils/messages.h"

static nserror nscss_import(hlcache_handle *handle,
		const hlcache_event *event, void *pw);

/**
 * Allocation callback for libcss
 *
 * \param ptr   Pointer to reallocate, or NULL for new allocation
 * \param size  Number of bytes requires
 * \param pw    Allocation context
 * \return Pointer to allocated block, or NULL on failure
 */
static void *myrealloc(void *ptr, size_t size, void *pw)
{
	return realloc(ptr, size);
}

/**
 * Initialise a CSS content
 *
 * \param c       Content to initialise
 * \param params  Content-Type parameters
 * \return true on success, false on failure
 */
bool nscss_create(struct content *c, const http_parameter *params)
{
	const char *charset = NULL;
	union content_msg_data msg_data;
	nserror error;

	/** \todo what happens about the allocator? */
	/** \todo proper error reporting */

	/* Find charset specified on HTTP layer, if any */
	error = http_parameter_list_find_item(params, "charset", &charset);
	if (error != NSERROR_OK) {
		/* No charset specified, use fallback, if any */
		/** \todo libcss will take this as gospel, which is wrong */
		charset = c->fallback_charset;
	}

	if (nscss_create_css_data(&c->data.css, content__get_url(c),
			charset, c->quirks) != NSERROR_OK) {
		msg_data.error = messages_get("NoMemory");
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		return false;
	}

	return true;
}

/**
 * Create a struct content_css_data, creating a stylesheet object
 *
 * \param c        Struct to populate
 * \param url      URL of stylesheet
 * \param charset  Stylesheet charset
 * \param quirks   Stylesheet quirks mode
 * \return NSERROR_OK on success, NSERROR_NOMEM on memory exhaustion
 */
nserror nscss_create_css_data(struct content_css_data *c,
		const char *url, const char *charset, bool quirks)
{
	css_error error;

	c->import_count = 0;
	c->imports = NULL;
	if (charset != NULL)
		c->charset = strdup(charset);
	else
		c->charset = NULL;

	error = css_stylesheet_create(CSS_LEVEL_21, charset,
			url, NULL, quirks, false,
			myrealloc, NULL, 
			nscss_resolve_url, NULL,
			&c->sheet);
	if (error != CSS_OK) {
		return NSERROR_NOMEM;
	}

	return NSERROR_OK;
}

/**
 * Process CSS source data
 *
 * \param c     Content structure
 * \param data  Data to process
 * \param size  Number of bytes to process
 * \return true on success, false on failure
 */
bool nscss_process_data(struct content *c, const char *data, unsigned int size)
{
	union content_msg_data msg_data;
	css_error error;

	error = nscss_process_css_data(&c->data.css, data, size);
	if (error != CSS_OK && error != CSS_NEEDDATA) {
		msg_data.error = "?";
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
	}

	return (error == CSS_OK || error == CSS_NEEDDATA);
}

/**
 * Process CSS data
 *
 * \param c     CSS content object
 * \param data  Data to process
 * \param size  Number of bytes to process
 * \return CSS_OK on success, appropriate error otherwise
 */
css_error nscss_process_css_data(struct content_css_data *c, const char *data, 
		unsigned int size)
{
	return css_stylesheet_append_data(c->sheet, 
			(const uint8_t *) data, size);
}

/**
 * Convert a CSS content ready for use
 *
 * \param c  Content to convert
 * \return true on success, false on failure
 */
bool nscss_convert(struct content *c)
{
	union content_msg_data msg_data;
	uint32_t i;
	size_t size;
	css_error error;

	error = nscss_convert_css_data(&c->data.css);
	if (error != CSS_OK) {
		msg_data.error = "?";
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		c->status = CONTENT_STATUS_ERROR;
		return false;
	}

	/* Retrieve the size of this sheet */
	error = css_stylesheet_size(c->data.css.sheet, &size);
	if (error != CSS_OK) {
		msg_data.error = "?";
		content_broadcast(c, CONTENT_MSG_ERROR, msg_data);
		c->status = CONTENT_STATUS_ERROR;
		return false;
	}
	c->size += size;

	/* Add on the size of the imported sheets */
	for (i = 0; i < c->data.css.import_count; i++) {
		if (c->data.css.imports[i].c != NULL) {
			struct content *import = hlcache_handle_get_content(
					c->data.css.imports[i].c);

			if (import != NULL) {
				c->size += import->size;
			}
		}
	}

	c->status = CONTENT_STATUS_DONE;

	return error == CSS_OK;
}

/**
 * Convert CSS data ready for use
 *
 * \param c     CSS data to convert
 * \return CSS error
 */
css_error nscss_convert_css_data(struct content_css_data *c)
{
	static const content_type accept[] = { CONTENT_CSS, CONTENT_UNKNOWN };
	const char *referer;
	uint32_t i = 0;
	css_error error;
	nserror nerror;

	error = css_stylesheet_get_url(c->sheet, &referer);
	if (error != CSS_OK) {
		return error;
	}

	error = css_stylesheet_data_done(c->sheet);

	/* Process pending imports */
	while (error == CSS_IMPORTS_PENDING) {
		hlcache_child_context child;
		struct nscss_import *imports;
		lwc_string *uri;
		uint64_t media;
		css_stylesheet *sheet;
		
		error = css_stylesheet_next_pending_import(c->sheet,
				&uri, &media);
		if (error != CSS_OK && error != CSS_INVALID) {
			return error;
		}

		/* Give up if there are no more imports */
		if (error == CSS_INVALID) {
			error = CSS_OK;
			break;
		}

		/* Increase space in table */
		imports = realloc(c->imports, (c->import_count + 1) * 
				sizeof(struct nscss_import));
		if (imports == NULL) {
			return CSS_NOMEM;
		}
		c->imports = imports;

		/** \todo fallback charset */
		child.charset = NULL;
		error = css_stylesheet_quirks_allowed(c->sheet, &child.quirks);
		if (error != CSS_OK) {
			return error;
		}

		/* Create content */
		i = c->import_count;
		c->imports[c->import_count].media = media;
		nerror = hlcache_handle_retrieve(lwc_string_data(uri),
				0, referer, NULL, nscss_import, c,
				&child, accept,
				&c->imports[c->import_count++].c);
		if (error != NSERROR_OK) {
			return CSS_NOMEM;
		}

		/* Wait for import to fetch + convert */
		/** \todo This blocking approach needs to die */
		while (c->imports[i].c != NULL && 
				content_get_status(c->imports[i].c) != 
				CONTENT_STATUS_DONE) {
			llcache_poll();
			gui_multitask();
		}

		if (c->imports[i].c != NULL) {
			struct content *s = hlcache_handle_get_content(
					c->imports[i].c);
			sheet = s->data.css.sheet;
		} else {
			error = css_stylesheet_create(CSS_LEVEL_DEFAULT,
					NULL, "", NULL, false, false,
					myrealloc, NULL, 
					nscss_resolve_url, NULL,
					&sheet);
			if (error != CSS_OK) {
				return error;
			}
		}

		error = css_stylesheet_register_import(c->sheet, sheet);
		if (error != CSS_OK) {
			return error;
		}

		error = CSS_IMPORTS_PENDING;
	}

	return error;
}

/**
 * Clean up a CSS content
 *
 * \param c  Content to clean up
 */
void nscss_destroy(struct content *c)
{
	nscss_destroy_css_data(&c->data.css);
}

/**
 * Clean up CSS data
 *
 * \param c  CSS data to clean up
 */
void nscss_destroy_css_data(struct content_css_data *c)
{
	uint32_t i;

	for (i = 0; i < c->import_count; i++) {
		if (c->imports[i].c != NULL) {
			hlcache_handle_release(c->imports[i].c);
		}
		c->imports[i].c = NULL;
	}

	free(c->imports);

	if (c->sheet != NULL) {
		css_stylesheet_destroy(c->sheet);
		c->sheet = NULL;
	}

	free(c->charset);
}

bool nscss_clone(const struct content *old, struct content *new_content)
{
	const char *data;
	unsigned long size;

	/* Simply replay create/process/convert */
	if (nscss_create_css_data(&new_content->data.css,
			content__get_url(new_content),
			old->data.css.charset, new_content->quirks) != NSERROR_OK)
		return false;

	data = content__get_source_data(new_content, &size);
	if (size > 0) {
		if (nscss_process_data(new_content, data, size) == false)
			return false;
	}

	if (old->status == CONTENT_STATUS_READY ||
			old->status == CONTENT_STATUS_DONE) {
		if (nscss_convert(new_content) == false)
			return false;
	}

	return true;
}

/**
 * Retrieve imported stylesheets
 *
 * \param h  Stylesheet containing imports
 * \param n  Pointer to location to receive number of imports
 * \return Pointer to array of imported stylesheets
 */
struct nscss_import *nscss_get_imports(hlcache_handle *h, uint32_t *n)
{
	struct content *c = hlcache_handle_get_content(h);

	assert(c != NULL);
	assert(c->type == CONTENT_CSS);
	assert(n != NULL);

	*n = c->data.css.import_count;

	return c->data.css.imports;
}

/**
 * Handler for imported stylesheet events
 *
 * \param handle  Handle for stylesheet
 * \param event   Event object
 * \param pw    Callback context
 * \return NSERROR_OK on success, appropriate error otherwise
 */
nserror nscss_import(hlcache_handle *handle,
		const hlcache_event *event, void *pw)
{
	struct content_css_data *parent = pw;
	uint32_t i = 0;

	switch (event->type) {
	case CONTENT_MSG_LOADING:
		if (content_get_type(handle) != CONTENT_CSS) {
			hlcache_handle_release(handle);

			for (i = 0; i < parent->import_count; i++) {
				if (parent->imports[i].c == handle) {
					parent->imports[i].c = NULL;
					break;
				}
			}
		}
		break;
	case CONTENT_MSG_READY:
		break;
	case CONTENT_MSG_DONE:
		break;
	case CONTENT_MSG_ERROR:
		hlcache_handle_release(handle);
		for (i = 0; i < parent->import_count; i++) {
			if (parent->imports[i].c == handle) {
				parent->imports[i].c = NULL;
				break;
			}
		}
		break;
	case CONTENT_MSG_STATUS:
		break;
	default:
		assert(0);
	}

	return NSERROR_OK;
}