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
|
/* 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/. */
//! Used for parsing and serializing component names from the syntax string.
use super::{Component, ComponentName, Multiplier};
use std::fmt::{self, Debug, Write};
use style_traits::{CssWriter, ToCss};
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#supported-names>
#[derive(Clone, Copy, Debug, MallocSizeOf, PartialEq)]
pub enum DataType {
/// Any valid `<length>` value
Length,
/// `<number>` values
Number,
/// Any valid <percentage> value
Percentage,
/// Any valid `<length>` or `<percentage>` value, any valid `<calc()>` expression combining
/// `<length>` and `<percentage>` components.
LengthPercentage,
/// Any valid `<color>` value
Color,
/// Any valid `<image>` value
Image,
/// Any valid `<url>` value
Url,
/// Any valid `<integer>` value
Integer,
/// Any valid `<angle>` value
Angle,
/// Any valid `<time>` value
Time,
/// Any valid `<resolution>` value
Resolution,
/// Any valid `<transform-function>` value
TransformFunction,
/// Any valid `<custom-ident>` value
CustomIdent,
/// A list of valid `<transform-function>` values. Note that "<transform-list>" is a pre-multiplied
/// data type name equivalent to "<transform-function>+"
TransformList,
/// Any valid `<string>` value
///
/// <https://github.com/w3c/css-houdini-drafts/issues/1103>
String,
}
impl DataType {
/// Converts a component name from a pre-multiplied data type to its un-pre-multiplied equivalent.
///
/// <https://drafts.css-houdini.org/css-properties-values-api-1/#pre-multiplied-data-type-name>
pub fn unpremultiply(&self) -> Option<Component> {
match *self {
DataType::TransformList => Some(Component {
name: ComponentName::DataType(DataType::TransformFunction),
multiplier: Some(Multiplier::Space),
}),
_ => None,
}
}
/// Parses a syntax component name.
pub fn from_str(ty: &str) -> Option<Self> {
Some(match ty.as_bytes() {
b"length" => DataType::Length,
b"number" => DataType::Number,
b"percentage" => DataType::Percentage,
b"length-percentage" => DataType::LengthPercentage,
b"color" => DataType::Color,
b"image" => DataType::Image,
b"url" => DataType::Url,
b"integer" => DataType::Integer,
b"angle" => DataType::Angle,
b"time" => DataType::Time,
b"resolution" => DataType::Resolution,
b"transform-function" => DataType::TransformFunction,
b"custom-ident" => DataType::CustomIdent,
b"transform-list" => DataType::TransformList,
b"string" => DataType::String,
_ => return None,
})
}
/// Returns true if this data type requires deferring computation to properly
/// resolve font-dependent lengths.
pub fn may_reference_font_relative_length(&self) -> bool {
match self {
DataType::Length |
DataType::LengthPercentage |
DataType::TransformFunction |
DataType::TransformList => true,
DataType::Number |
DataType::Percentage |
DataType::Color |
DataType::Image |
DataType::Url |
DataType::Integer |
DataType::Angle |
DataType::Time |
DataType::Resolution |
DataType::CustomIdent |
DataType::String => false,
}
}
}
impl ToCss for DataType {
fn to_css<W>(&self, dest: &mut CssWriter<W>) -> fmt::Result
where
W: Write,
{
dest.write_char('<')?;
dest.write_str(match *self {
DataType::Length => "length",
DataType::Number => "number",
DataType::Percentage => "percentage",
DataType::LengthPercentage => "length-percentage",
DataType::Color => "color",
DataType::Image => "image",
DataType::Url => "url",
DataType::Integer => "integer",
DataType::Angle => "angle",
DataType::Time => "time",
DataType::Resolution => "resolution",
DataType::TransformFunction => "transform-function",
DataType::CustomIdent => "custom-ident",
DataType::TransformList => "transform-list",
DataType::String => "string",
})?;
dest.write_char('>')
}
}
|