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
|
/*
* This file is part of LibCSS.
* Licensed under the MIT License,
* http://www.opensource.org/licenses/mit-license.php
* Copyright 2009 John-Mark Bell <jmb@netsurf-browser.org>
*/
#include <assert.h>
#include <string.h>
#include "bytecode/bytecode.h"
#include "bytecode/opcodes.h"
#include "parse/properties/properties.h"
#include "parse/properties/utils.h"
/**
* Parse padding shorthand
*
* \param c Parsing context
* \param vector Vector of tokens to process
* \param ctx Pointer to vector iteration context
* \param result Pointer to location to receive resulting style
* \return CSS_OK on success,
* CSS_NOMEM on memory exhaustion,
* CSS_INVALID if the input is not valid
*
* Post condition: \a *ctx is updated with the next token to process
* If the input is invalid, then \a *ctx remains unchanged.
*/
css_error parse_padding(css_language *c,
const parserutils_vector *vector, int *ctx,
css_style **result)
{
int orig_ctx = *ctx;
int prev_ctx;
const css_token *token;
css_style *top = NULL;
css_style *right = NULL;
css_style *bottom = NULL;
css_style *left = NULL;
css_style *ret = NULL;
uint32_t num_sides = 0;
uint32_t required_size;
bool match;
css_error error;
/* Firstly, handle inherit */
token = parserutils_vector_peek(vector, *ctx);
if (token != NULL && token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[INHERIT],
&match) == lwc_error_ok && match)) {
uint32_t *bytecode;
error = css_stylesheet_style_create(c->sheet,
4 * sizeof(uint32_t), &ret);
if (error != CSS_OK) {
*ctx = orig_ctx;
return error;
}
bytecode = (uint32_t *) ret->bytecode;
*(bytecode++) = buildOPV(CSS_PROP_PADDING_TOP,
FLAG_INHERIT, 0);
*(bytecode++) = buildOPV(CSS_PROP_PADDING_RIGHT,
FLAG_INHERIT, 0);
*(bytecode++) = buildOPV(CSS_PROP_PADDING_BOTTOM,
FLAG_INHERIT, 0);
*(bytecode++) = buildOPV(CSS_PROP_PADDING_LEFT,
FLAG_INHERIT, 0);
parserutils_vector_iterate(vector, ctx);
*result = ret;
return CSS_OK;
} else if (token == NULL) {
/* No tokens -- clearly garbage */
*ctx = orig_ctx;
return CSS_INVALID;
}
/* Attempt to parse up to 4 widths */
do {
prev_ctx = *ctx;
error = CSS_OK;
/* Ensure that we're not about to parse another inherit */
token = parserutils_vector_peek(vector, *ctx);
if (token != NULL && token->type == CSS_TOKEN_IDENT &&
(lwc_string_caseless_isequal(
token->idata, c->strings[INHERIT],
&match) == lwc_error_ok && match)) {
error = CSS_INVALID;
goto cleanup;
}
if (top == NULL &&
(error = parse_padding_side(c, vector, ctx,
CSS_PROP_PADDING_TOP, &top)) == CSS_OK) {
num_sides = 1;
} else if (right == NULL &&
(error = parse_padding_side(c, vector, ctx,
CSS_PROP_PADDING_RIGHT, &right)) == CSS_OK) {
num_sides = 2;
} else if (bottom == NULL &&
(error = parse_padding_side(c, vector, ctx,
CSS_PROP_PADDING_BOTTOM, &bottom)) == CSS_OK) {
num_sides = 3;
} else if (left == NULL &&
(error = parse_padding_side(c, vector, ctx,
CSS_PROP_PADDING_LEFT, &left)) == CSS_OK) {
num_sides = 4;
}
if (error == CSS_OK) {
consumeWhitespace(vector, ctx);
token = parserutils_vector_peek(vector, *ctx);
} else {
/* Forcibly cause loop to exit */
token = NULL;
}
} while (*ctx != prev_ctx && token != NULL);
if (num_sides == 0) {
error = CSS_INVALID;
goto cleanup;
}
/* Calculate size of resultant style */
if (num_sides == 1) {
required_size = 4 * top->length;
} else if (num_sides == 2) {
required_size = 2 * top->length + 2 * right->length;
} else if (num_sides == 3) {
required_size = top->length + 2 * right->length +
bottom->length;
} else {
required_size = top->length + right->length +
bottom->length + left->length;
}
error = css_stylesheet_style_create(c->sheet, required_size, &ret);
if (error != CSS_OK)
goto cleanup;
required_size = 0;
if (num_sides == 1) {
uint32_t *opv = ((uint32_t *) top->bytecode);
uint8_t flags = getFlags(*opv);
uint16_t value = getValue(*opv);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
*opv = buildOPV(CSS_PROP_PADDING_RIGHT, flags, value);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
*opv = buildOPV(CSS_PROP_PADDING_BOTTOM, flags, value);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
*opv = buildOPV(CSS_PROP_PADDING_LEFT, flags, value);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
} else if (num_sides == 2) {
uint32_t *vopv = ((uint32_t *) top->bytecode);
uint32_t *hopv = ((uint32_t *) right->bytecode);
uint8_t vflags = getFlags(*vopv);
uint8_t hflags = getFlags(*hopv);
uint16_t vvalue = getValue(*vopv);
uint16_t hvalue = getValue(*hopv);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
right->bytecode, right->length);
required_size += right->length;
*vopv = buildOPV(CSS_PROP_PADDING_BOTTOM, vflags, vvalue);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
*hopv = buildOPV(CSS_PROP_PADDING_LEFT, hflags, hvalue);
memcpy(((uint8_t *) ret->bytecode) + required_size,
right->bytecode, right->length);
required_size += right->length;
} else if (num_sides == 3) {
uint32_t *opv = ((uint32_t *) right->bytecode);
uint8_t flags = getFlags(*opv);
uint16_t value = getValue(*opv);
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
right->bytecode, right->length);
required_size += right->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
bottom->bytecode, bottom->length);
required_size += bottom->length;
*opv = buildOPV(CSS_PROP_PADDING_LEFT, flags, value);
memcpy(((uint8_t *) ret->bytecode) + required_size,
right->bytecode, right->length);
required_size += right->length;
} else {
memcpy(((uint8_t *) ret->bytecode) + required_size,
top->bytecode, top->length);
required_size += top->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
right->bytecode, right->length);
required_size += right->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
bottom->bytecode, bottom->length);
required_size += bottom->length;
memcpy(((uint8_t *) ret->bytecode) + required_size,
left->bytecode, left->length);
required_size += left->length;
}
assert(required_size == ret->length);
/* Write the result */
*result = ret;
/* Invalidate ret, so that cleanup doesn't destroy it */
ret = NULL;
/* Clean up after ourselves */
cleanup:
if (top)
css_stylesheet_style_destroy(c->sheet, top, error == CSS_OK);
if (right)
css_stylesheet_style_destroy(c->sheet, right, error == CSS_OK);
if (bottom)
css_stylesheet_style_destroy(c->sheet, bottom, error == CSS_OK);
if (left)
css_stylesheet_style_destroy(c->sheet, left, error == CSS_OK);
if (ret)
css_stylesheet_style_destroy(c->sheet, ret, error == CSS_OK);
if (error != CSS_OK)
*ctx = orig_ctx;
return error;
}
|
