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
|
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
<%namespace name="helpers" file="/helpers.mako.rs" />
// TODO: other background-* properties
<%helpers:shorthand name="background"
engines="gecko servo-2013 servo-2020"
sub_properties="background-color background-position-x background-position-y background-repeat
background-attachment background-image background-size background-origin
background-clip"
spec="https://drafts.csswg.org/css-backgrounds/#the-background">
use crate::properties::longhands::{background_position_x, background_position_y, background_repeat};
use crate::properties::longhands::{background_attachment, background_color, background_image, background_size, background_origin};
use crate::properties::longhands::background_clip;
use crate::properties::longhands::background_clip::single_value::computed_value::T as Clip;
use crate::properties::longhands::background_origin::single_value::computed_value::T as Origin;
use crate::values::specified::{AllowQuirks, Color, Position, PositionComponent};
use crate::parser::Parse;
// FIXME(emilio): Should be the same type!
impl From<background_origin::single_value::SpecifiedValue> for background_clip::single_value::SpecifiedValue {
fn from(origin: background_origin::single_value::SpecifiedValue) ->
background_clip::single_value::SpecifiedValue {
match origin {
background_origin::single_value::SpecifiedValue::ContentBox =>
background_clip::single_value::SpecifiedValue::ContentBox,
background_origin::single_value::SpecifiedValue::PaddingBox =>
background_clip::single_value::SpecifiedValue::PaddingBox,
background_origin::single_value::SpecifiedValue::BorderBox =>
background_clip::single_value::SpecifiedValue::BorderBox,
}
}
}
pub fn parse_value<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Longhands, ParseError<'i>> {
let mut background_color = None;
% for name in "image position_x position_y repeat size attachment origin clip".split():
// Vec grows from 0 to 4 by default on first push(). So allocate with
// capacity 1, so in the common case of only one item we don't way
// overallocate, then shrink. Note that we always push at least one
// item if parsing succeeds.
let mut background_${name} = Vec::with_capacity(1);
% endfor
input.parse_comma_separated(|input| {
// background-color can only be in the last element, so if it
// is parsed anywhere before, the value is invalid.
if background_color.is_some() {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
% for name in "image position repeat size attachment origin clip".split():
let mut ${name} = None;
% endfor
loop {
if background_color.is_none() {
if let Ok(value) = input.try_parse(|i| Color::parse(context, i)) {
background_color = Some(value);
continue
}
}
if position.is_none() {
if let Ok(value) = input.try_parse(|input| {
Position::parse_three_value_quirky(context, input, AllowQuirks::No)
}) {
position = Some(value);
// Parse background size, if applicable.
size = input.try_parse(|input| {
input.expect_delim('/')?;
background_size::single_value::parse(context, input)
}).ok();
continue
}
}
% for name in "image repeat attachment origin clip".split():
if ${name}.is_none() {
if let Ok(value) = input.try_parse(|input| background_${name}::single_value
::parse(context, input)) {
${name} = Some(value);
continue
}
}
% endfor
break
}
if clip.is_none() {
if let Some(origin) = origin {
clip = Some(background_clip::single_value::SpecifiedValue::from(origin));
}
}
let mut any = false;
% for name in "image position repeat size attachment origin clip".split():
any = any || ${name}.is_some();
% endfor
any = any || background_color.is_some();
if any {
if let Some(position) = position {
background_position_x.push(position.horizontal);
background_position_y.push(position.vertical);
} else {
background_position_x.push(PositionComponent::zero());
background_position_y.push(PositionComponent::zero());
}
% for name in "image repeat size attachment origin clip".split():
if let Some(bg_${name}) = ${name} {
background_${name}.push(bg_${name});
} else {
background_${name}.push(background_${name}::single_value
::get_initial_specified_value());
}
% endfor
Ok(())
} else {
Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError))
}
})?;
Ok(expanded! {
background_color: background_color.unwrap_or(Color::transparent()),
% for name in "image position_x position_y repeat size attachment origin clip".split():
background_${name}: background_${name}::SpecifiedValue(background_${name}.into()),
% endfor
})
}
impl<'a> ToCss for LonghandsToSerialize<'a> {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: fmt::Write {
let len = self.background_image.0.len();
// There should be at least one declared value
if len == 0 {
return Ok(());
}
// If a value list length is differs then we don't do a shorthand serialization.
// The exceptions to this is color which appears once only and is serialized
// with the last item.
% for name in "image position_x position_y size repeat origin clip attachment".split():
if len != self.background_${name}.0.len() {
return Ok(());
}
% endfor
for i in 0..len {
% for name in "image position_x position_y repeat size attachment origin clip".split():
let ${name} = &self.background_${name}.0[i];
% endfor
if i != 0 {
dest.write_str(", ")?;
}
let mut wrote_value = false;
if i == len - 1 {
if *self.background_color != background_color::get_initial_specified_value() {
self.background_color.to_css(dest)?;
wrote_value = true;
}
}
if *image != background_image::single_value::get_initial_specified_value() {
if wrote_value {
dest.write_str(" ")?;
}
image.to_css(dest)?;
wrote_value = true;
}
// Size is only valid after a position so when there is a
// non-initial size we must also serialize position
if *position_x != PositionComponent::zero() ||
*position_y != PositionComponent::zero() ||
*size != background_size::single_value::get_initial_specified_value()
{
if wrote_value {
dest.write_str(" ")?;
}
Position {
horizontal: position_x.clone(),
vertical: position_y.clone()
}.to_css(dest)?;
wrote_value = true;
if *size != background_size::single_value::get_initial_specified_value() {
dest.write_str(" / ")?;
size.to_css(dest)?;
}
}
% for name in "repeat attachment".split():
if *${name} != background_${name}::single_value::get_initial_specified_value() {
if wrote_value {
dest.write_str(" ")?;
}
${name}.to_css(dest)?;
wrote_value = true;
}
% endfor
if *origin != Origin::PaddingBox || *clip != Clip::BorderBox {
if wrote_value {
dest.write_str(" ")?;
}
origin.to_css(dest)?;
if *clip != From::from(*origin) {
dest.write_str(" ")?;
clip.to_css(dest)?;
}
wrote_value = true;
}
if !wrote_value {
image.to_css(dest)?;
}
}
Ok(())
}
}
</%helpers:shorthand>
<%helpers:shorthand name="background-position"
engines="gecko servo-2013 servo-2020"
flags="SHORTHAND_IN_GETCS"
sub_properties="background-position-x background-position-y"
spec="https://drafts.csswg.org/css-backgrounds-4/#the-background-position">
use crate::properties::longhands::{background_position_x, background_position_y};
use crate::values::specified::AllowQuirks;
use crate::values::specified::position::Position;
pub fn parse_value<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Longhands, ParseError<'i>> {
// Vec grows from 0 to 4 by default on first push(). So allocate with
// capacity 1, so in the common case of only one item we don't way
// overallocate, then shrink. Note that we always push at least one
// item if parsing succeeds.
let mut position_x = Vec::with_capacity(1);
let mut position_y = Vec::with_capacity(1);
let mut any = false;
input.parse_comma_separated(|input| {
let value = Position::parse_three_value_quirky(context, input, AllowQuirks::Yes)?;
position_x.push(value.horizontal);
position_y.push(value.vertical);
any = true;
Ok(())
})?;
if !any {
return Err(input.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(expanded! {
background_position_x: background_position_x::SpecifiedValue(position_x.into()),
background_position_y: background_position_y::SpecifiedValue(position_y.into()),
})
}
impl<'a> ToCss for LonghandsToSerialize<'a> {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result where W: fmt::Write {
let len = self.background_position_x.0.len();
if len == 0 || len != self.background_position_y.0.len() {
return Ok(());
}
for i in 0..len {
Position {
horizontal: self.background_position_x.0[i].clone(),
vertical: self.background_position_y.0[i].clone()
}.to_css(dest)?;
if i < len - 1 {
dest.write_str(", ")?;
}
}
Ok(())
}
}
</%helpers:shorthand>
|