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
|
/* 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/. */
//! Specified types for CSS Easing functions.
use crate::parser::{Parse, ParserContext};
use crate::values::computed::easing::TimingFunction as ComputedTimingFunction;
use crate::values::generics::easing::TimingFunction as GenericTimingFunction;
use crate::values::generics::easing::{StepPosition, TimingKeyword};
use crate::values::specified::{Integer, Number};
use cssparser::Parser;
use selectors::parser::SelectorParseErrorKind;
use style_traits::{ParseError, StyleParseErrorKind};
/// A specified timing function.
pub type TimingFunction = GenericTimingFunction<Integer, Number>;
impl Parse for TimingFunction {
fn parse<'i, 't>(
context: &ParserContext,
input: &mut Parser<'i, 't>,
) -> Result<Self, ParseError<'i>> {
if let Ok(keyword) = input.try_parse(TimingKeyword::parse) {
return Ok(GenericTimingFunction::Keyword(keyword));
}
if let Ok(ident) = input.try_parse(|i| i.expect_ident_cloned()) {
let position = match_ignore_ascii_case! { &ident,
"step-start" => StepPosition::Start,
"step-end" => StepPosition::End,
_ => {
return Err(input.new_custom_error(
SelectorParseErrorKind::UnexpectedIdent(ident.clone())
));
},
};
return Ok(GenericTimingFunction::Steps(Integer::new(1), position));
}
let location = input.current_source_location();
let function = input.expect_function()?.clone();
input.parse_nested_block(move |i| {
(match_ignore_ascii_case! { &function,
"cubic-bezier" => {
let x1 = Number::parse(context, i)?;
i.expect_comma()?;
let y1 = Number::parse(context, i)?;
i.expect_comma()?;
let x2 = Number::parse(context, i)?;
i.expect_comma()?;
let y2 = Number::parse(context, i)?;
if x1.get() < 0.0 || x1.get() > 1.0 || x2.get() < 0.0 || x2.get() > 1.0 {
return Err(i.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(GenericTimingFunction::CubicBezier { x1, y1, x2, y2 })
},
"steps" => {
let steps = Integer::parse_positive(context, i)?;
let position = i.try_parse(|i| {
i.expect_comma()?;
StepPosition::parse(context, i)
}).unwrap_or(StepPosition::End);
// jump-none accepts a positive integer greater than 1.
// FIXME(emilio): The spec asks us to avoid rejecting it at parse
// time except until computed value time.
//
// It's not totally clear it's worth it though, and no other browser
// does this.
if position == StepPosition::JumpNone && 2 > steps.value() {
return Err(i.new_custom_error(StyleParseErrorKind::UnspecifiedError));
}
Ok(GenericTimingFunction::Steps(steps, position))
},
_ => Err(()),
})
.map_err(|()| {
location.new_custom_error(StyleParseErrorKind::UnexpectedFunction(function.clone()))
})
})
}
}
// We need this for converting the specified TimingFunction into computed TimingFunction without
// Context (for some FFIs in glue.rs). In fact, we don't really need Context to get the computed
// value of TimingFunction.
impl TimingFunction {
/// Generate the ComputedTimingFunction without Context.
pub fn to_computed_value_without_context(&self) -> ComputedTimingFunction {
match *self {
GenericTimingFunction::Steps(steps, pos) => {
GenericTimingFunction::Steps(steps.value(), pos)
},
GenericTimingFunction::CubicBezier { x1, y1, x2, y2 } => {
GenericTimingFunction::CubicBezier {
x1: x1.get(),
y1: y1.get(),
x2: x2.get(),
y2: y2.get(),
}
},
GenericTimingFunction::Keyword(keyword) => GenericTimingFunction::Keyword(keyword),
}
}
}
|
