summaryrefslogtreecommitdiff
path: root/src/parse/font_face.c
blob: 8eab0067a9d0f95ca7cdf6ac8fea467d757dcebd (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
/*
 * This file is part of LibCSS.
 * Licensed under the MIT License,
 *                http://www.opensource.org/licenses/mit-license.php
 * Copyright 2011 Things Made Out Of Other Things Ltd.
 * Written by James Montgomerie <jamie@th.ingsmadeoutofotherthin.gs>
 */

#include "parse/font_face.h"

#include <assert.h>
#include <string.h>

#include "parse/propstrings.h"
#include "parse/properties/utils.h"
#include "select/font_face.h"

static bool font_rule_font_family_reserved(css_language *c, 
		const css_token *ident)
{
	bool match;

	return (lwc_string_caseless_isequal(ident->idata, c->strings[SERIF],
			&match) == lwc_error_ok && match) ||
		(lwc_string_caseless_isequal(ident->idata, 
			c->strings[SANS_SERIF], &match) == lwc_error_ok && 
			match) ||
		(lwc_string_caseless_isequal(ident->idata, c->strings[CURSIVE],
			&match) == lwc_error_ok && match) ||
		(lwc_string_caseless_isequal(ident->idata, c->strings[FANTASY],
			&match) == lwc_error_ok && match) ||
		(lwc_string_caseless_isequal(ident->idata, 
			c->strings[MONOSPACE], &match) == lwc_error_ok && 
			match) ||
		(lwc_string_caseless_isequal(ident->idata, c->strings[INHERIT],
			&match) == lwc_error_ok && match) ||
		(lwc_string_caseless_isequal(ident->idata, c->strings[INITIAL],
			&match) == lwc_error_ok && match) ||
		(lwc_string_caseless_isequal(ident->idata, c->strings[DEFAULT],
			&match) == lwc_error_ok && match);
}

static css_error font_face_parse_font_family(css_language *c, 
		const parserutils_vector *vector, int *ctx,
		css_font_face *font_face) 
{
	css_error error;
	lwc_string *string;

	error = css__ident_list_or_string_to_string(c, vector, ctx,
				font_rule_font_family_reserved, &string);
	if (error != CSS_OK)
		return error;

	css__font_face_set_font_family(font_face, string);

	lwc_string_unref(string);

	return CSS_OK;
}
	
static css_error font_face_src_parse_format(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		css_font_face_format *format)
{
	bool match;
	const css_token *token;

	*format = CSS_FONT_FACE_FORMAT_UNSPECIFIED;

	/* 'format(' STRING [ ',' STRING ]* ')' 
	 * 
	 * 'format(' already consumed
	 */

	do {
		consumeWhitespace(vector, ctx);

		token = parserutils_vector_iterate(vector, ctx);
		if (token == NULL || token->type != CSS_TOKEN_STRING)
			return CSS_INVALID;

		if (lwc_string_isequal(token->idata, 
				c->strings[WOFF], &match) == lwc_error_ok && 
				match) {
		    	*format |= CSS_FONT_FACE_FORMAT_WOFF;
		} else if ((lwc_string_isequal(token->idata, 
				c->strings[TRUETYPE], &match) == lwc_error_ok &&
				match) ||
			(lwc_string_isequal(token->idata, 
				c->strings[OPENTYPE], &match) == lwc_error_ok &&
				match)) {
			*format |= CSS_FONT_FACE_FORMAT_OPENTYPE;
		} else if (lwc_string_isequal(token->idata, 
				c->strings[EMBEDDED_OPENTYPE], 
				&match) == lwc_error_ok && match) {
			*format |= CSS_FONT_FACE_FORMAT_EMBEDDED_OPENTYPE;
		} else if (lwc_string_isequal(token->idata, 
				c->strings[SVG], &match) == lwc_error_ok && 
				match) {
			*format |= CSS_FONT_FACE_FORMAT_SVG;
		} else {
			/* The spec gives a list of possible strings, which 
			 * hints that unknown strings should be parse errors,
			 * but it also talks about "unknown font formats",
			 * so we treat any string we don't know not as a parse
			 * error, but as indicating an "unknown font format".
			 */
			*format |= CSS_FONT_FACE_FORMAT_UNKNOWN;
		}

		consumeWhitespace(vector, ctx);
		token = parserutils_vector_iterate(vector, ctx);
	} while (token != NULL && tokenIsChar(token, ','));

	if (token == NULL || tokenIsChar(token, ')') == false)
		return CSS_INVALID;

	return CSS_OK;
}

static css_error font_face_src_parse_spec_or_name(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		lwc_string **location,
		css_font_face_location_type *location_type,
		css_font_face_format *format)
{
	const css_token *token;
	css_error error;
	bool match;

 	/* spec-or-name    ::= font-face-spec | font-face-name
 	 * font-face-spec  ::= URI [ 'format(' STRING [ ',' STRING ]* ')' ]?
 	 * font-face-name  ::= 'local(' ident-list-or-string ')'
 	 * ident-list-or-string ::= IDENT IDENT* | STRING
 	 */

	consumeWhitespace(vector, ctx);

	token = parserutils_vector_iterate(vector, ctx);
	if (token == NULL) 
		return CSS_INVALID;

	if (token->type == CSS_TOKEN_URI) {
		error = c->sheet->resolve(c->sheet->resolve_pw,
				c->sheet->url, token->idata, 
				location);
		if (error != CSS_OK)
			return error;

		*location_type = CSS_FONT_FACE_LOCATION_TYPE_URI;

		consumeWhitespace(vector, ctx);

		token = parserutils_vector_peek(vector, *ctx);
		if (token != NULL && token->type == CSS_TOKEN_FUNCTION &&
				lwc_string_caseless_isequal(token->idata, 
				c->strings[FORMAT], &match) == lwc_error_ok && 
				match) {
			parserutils_vector_iterate(vector, ctx);	

			error = font_face_src_parse_format(c, vector, ctx,
					format);
			if (error != CSS_OK) {
				lwc_string_unref(*location);
				return error;
			}
		}
	} else if (token->type == CSS_TOKEN_FUNCTION &&
			lwc_string_caseless_isequal(token->idata, 
					c->strings[LOCAL], 
					&match) == lwc_error_ok && match) {
		consumeWhitespace(vector, ctx);

		error = css__ident_list_or_string_to_string(
				c, vector, ctx, NULL, location);
		if (error != CSS_OK)
			return error;

		consumeWhitespace(vector, ctx);

		token = parserutils_vector_iterate(vector, ctx);		
		if (token == NULL || tokenIsChar(token, ')') == false) {
			lwc_string_unref(*location);
			return CSS_INVALID;
		}

		*location_type = CSS_FONT_FACE_LOCATION_TYPE_LOCAL;
	} else {
		return CSS_INVALID;
	}

	return CSS_OK;
}

static css_error font_face_parse_src(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
	     	css_font_face *font_face)
{
	int orig_ctx = *ctx;
	css_error error = CSS_OK;
	const css_token *token;
	css_font_face_src *srcs = NULL, *new_srcs = NULL;
	uint32_t n_srcs = 0;

	/* src             ::= spec-or-name [ ',' spec-or-name ]*
 	 * spec-or-name    ::= font-face-spec | font-face-name
 	 * font-face-spec  ::= URI [ 'format(' STRING [ ',' STRING ]* ')' ]?
 	 * font-face-name  ::= 'local(' ident-list-or-string ')'
 	 * ident-list-or-string ::= IDENT IDENT* | STRING
 	 */

	/* Create one css_font_face_src for each consecutive location and
	 * [potentially] type pair in the comma-separated list
	 */
	do {	
		lwc_string *location;
		css_font_face_location_type location_type =
				CSS_FONT_FACE_LOCATION_TYPE_UNSPECIFIED;
		css_font_face_format format = 
				CSS_FONT_FACE_FORMAT_UNSPECIFIED;

		error = font_face_src_parse_spec_or_name(c, vector, ctx,
				&location, &location_type, &format);
		if (error != CSS_OK)
			goto cleanup;

		/* This will be inefficient if there are a lot of locations - 
		 * probably not a problem in practice.
		 */
		new_srcs = realloc(srcs, 
				(n_srcs + 1) * sizeof(css_font_face_src));
		if (new_srcs == NULL) {
			error = CSS_NOMEM;
			goto cleanup;
		}
		srcs = new_srcs;

		srcs[n_srcs].location = location;
		srcs[n_srcs].bits[0] = format << 2 | location_type;

		++n_srcs;
	
		consumeWhitespace(vector, ctx);
		token = parserutils_vector_iterate(vector, ctx);
	} while (token != NULL && tokenIsChar(token, ','));

	error = css__font_face_set_srcs(font_face, srcs, n_srcs);

cleanup:
	if (error != CSS_OK) {
		*ctx = orig_ctx;
		if (srcs != NULL) 
			free(srcs);
	}

	return error;
}

static css_error font_face_parse_font_style(css_language *c,
		const parserutils_vector *vector, int *ctx,
		css_font_face *font_face)
{
	int orig_ctx = *ctx;
	css_error error = CSS_OK;
	const css_token *token;
	enum css_font_style_e style = 0;
	bool match;

	/* IDENT(normal, italic, oblique) */

	token = parserutils_vector_iterate(vector, ctx);
	if ((token == NULL) || ((token->type != CSS_TOKEN_IDENT))) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}	
	
	if ((lwc_string_caseless_isequal(token->idata, 
			c->strings[NORMAL], &match) == lwc_error_ok && match)) {
		style = CSS_FONT_STYLE_NORMAL;
	} else if ((lwc_string_caseless_isequal(token->idata, 
			c->strings[ITALIC], &match) == lwc_error_ok && match)) {
		style = CSS_FONT_STYLE_ITALIC;
	} else if ((lwc_string_caseless_isequal(token->idata, 
			c->strings[OBLIQUE], &match) == lwc_error_ok && 
			match)) {
		style = CSS_FONT_STYLE_OBLIQUE;
	} else {
		error = CSS_INVALID;
	}

	if (error == CSS_OK) {
		font_face->bits[0] = (font_face->bits[0] & 0xfc) | style;
	} else {
		*ctx = orig_ctx;
	}
	
	return error;
}

static css_error font_face_parse_font_weight(css_language *c, 
		const parserutils_vector *vector, int *ctx, 
		css_font_face *font_face)
{
	int orig_ctx = *ctx;
	css_error error = CSS_OK;
	const css_token *token;
	enum css_font_weight_e weight = 0;
	bool match;

	/* NUMBER (100, 200, 300, 400, 500, 600, 700, 800, 900) | 
	 * IDENT (normal, bold) */
	token = parserutils_vector_iterate(vector, ctx);
	if (token == NULL || (token->type != CSS_TOKEN_IDENT &&
			token->type != CSS_TOKEN_NUMBER)) {
		*ctx = orig_ctx;
		return CSS_INVALID;
	}

	if (token->type == CSS_TOKEN_NUMBER) {
		size_t consumed = 0;
		css_fixed num = css__number_from_lwc_string(token->idata, 
				true, &consumed);
		/* Invalid if there are trailing characters */
		if (consumed != lwc_string_length(token->idata)) {
			*ctx = orig_ctx;
			return CSS_INVALID;
		}

		switch (FIXTOINT(num)) {
		case 100: weight = CSS_FONT_WEIGHT_100; break;
		case 200: weight = CSS_FONT_WEIGHT_200; break;
		case 300: weight = CSS_FONT_WEIGHT_300; break;
		case 400: weight = CSS_FONT_WEIGHT_400; break;
		case 500: weight = CSS_FONT_WEIGHT_500; break;
		case 600: weight = CSS_FONT_WEIGHT_600; break;
		case 700: weight = CSS_FONT_WEIGHT_700; break;
		case 800: weight = CSS_FONT_WEIGHT_800; break;
		case 900: weight = CSS_FONT_WEIGHT_900; break;
		default: error = CSS_INVALID;
		}
	} else if ((lwc_string_caseless_isequal(token->idata, 
			c->strings[NORMAL], &match) == lwc_error_ok && match)) {
		weight = CSS_FONT_WEIGHT_NORMAL;
	} else if ((lwc_string_caseless_isequal(token->idata, 
			c->strings[BOLD], &match) == lwc_error_ok && match)) {
		weight = CSS_FONT_WEIGHT_BOLD;
	} else {
		error = CSS_INVALID;
	}

	if (error == CSS_OK) {
		font_face->bits[0] = (font_face->bits[0] & 0xc3) | 
				(weight << 2);
	} else {
		*ctx = orig_ctx;
	}

	return error;
}

/**
 * Parse a descriptor in an @font-face rule
 *
 * \param c           Parsing context
 * \param descriptor  Token for this descriptor
 * \param vector      Vector of tokens to process
 * \param ctx	      Pointer to vector iteration context
 * \param rule	      Rule to process descriptor into
 * \return CSS_OK on success,
 *         CSS_BADPARM on bad parameters,
 *         CSS_INVALID on invalid syntax,
 *         CSS_NOMEM on memory exhaustion
 */
css_error css__parse_font_descriptor(css_language *c, 
		const css_token *descriptor, const parserutils_vector *vector,
		int *ctx, css_rule_font_face *rule)
{
	css_font_face *font_face = rule->font_face;
	css_error error;
	bool match;

	if (font_face == NULL) {
		error = css__font_face_create(&font_face);
		if (error != CSS_OK) {
			return error;
		}

		rule->font_face = font_face;
	}
	
	if (lwc_string_caseless_isequal(descriptor->idata, 
			c->strings[FONT_FAMILY], &match) == lwc_error_ok && 
			match) {
		return font_face_parse_font_family(c, vector, ctx, font_face);
	} else if (lwc_string_caseless_isequal(descriptor->idata,
			c->strings[SRC], &match) == lwc_error_ok && match) {
		return font_face_parse_src(c, vector, ctx, font_face);
	} else if (lwc_string_caseless_isequal(descriptor->idata,
			c->strings[FONT_STYLE], &match) == lwc_error_ok && 
			match) {
		return font_face_parse_font_style(c, vector, ctx, font_face);
	} else if (lwc_string_caseless_isequal(descriptor->idata,
			c->strings[FONT_WEIGHT], &match) == lwc_error_ok && 
			match) {
		return font_face_parse_font_weight(c, vector, ctx, font_face);
	}
	
	return CSS_INVALID;
}