script/dom/
css.rs

1/* This Source Code Form is subject to the terms of the Mozilla Public
2 * License, v. 2.0. If a copy of the MPL was not distributed with this
3 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
4
5use cssparser::{Parser, ParserInput, serialize_identifier};
6use dom_struct::dom_struct;
7use layout_api::{PropertyRegistration, RegisterPropertyError};
8use script_bindings::codegen::GenericBindings::CSSBinding::PropertyDefinition;
9use style::context::QuirksMode;
10use style::parser::ParserContext;
11use style::stylesheets::supports_rule::{Declaration, parse_condition_or_declaration};
12use style::stylesheets::{CssRuleType, Origin, UrlExtraData};
13use style_traits::ParsingMode;
14
15use crate::dom::bindings::codegen::Bindings::CSSBinding::CSSMethods;
16use crate::dom::bindings::codegen::Bindings::WindowBinding::Window_Binding::WindowMethods;
17use crate::dom::bindings::error::{Error, Fallible};
18use crate::dom::bindings::reflector::Reflector;
19use crate::dom::bindings::root::DomRoot;
20use crate::dom::bindings::str::DOMString;
21use crate::dom::window::Window;
22use crate::dom::worklet::Worklet;
23
24#[dom_struct]
25#[allow(clippy::upper_case_acronyms)]
26pub(crate) struct CSS {
27    reflector_: Reflector,
28}
29
30impl CSSMethods<crate::DomTypeHolder> for CSS {
31    /// <https://drafts.csswg.org/cssom/#the-css.escape()-method>
32    fn Escape(_: &Window, ident: DOMString) -> Fallible<DOMString> {
33        let mut escaped = String::new();
34        serialize_identifier(&ident.str(), &mut escaped).unwrap();
35        Ok(DOMString::from(escaped))
36    }
37
38    /// <https://drafts.csswg.org/css-conditional/#dom-css-supports>
39    fn Supports(win: &Window, property: DOMString, value: DOMString) -> bool {
40        let mut decl = String::new();
41        serialize_identifier(&property.str(), &mut decl).unwrap();
42        decl.push_str(": ");
43        decl.push_str(&value.str());
44        let decl = Declaration(decl);
45        let url_data = UrlExtraData(win.Document().url().get_arc());
46        let context = ParserContext::new(
47            Origin::Author,
48            &url_data,
49            Some(CssRuleType::Style),
50            ParsingMode::DEFAULT,
51            QuirksMode::NoQuirks,
52            /* namespaces = */ Default::default(),
53            None,
54            None,
55        );
56        decl.eval(&context)
57    }
58
59    /// <https://drafts.csswg.org/css-conditional/#dom-css-supports>
60    fn Supports_(win: &Window, condition: DOMString) -> bool {
61        let condition = condition.str();
62        let mut input = ParserInput::new(&condition);
63        let mut input = Parser::new(&mut input);
64        let cond = match parse_condition_or_declaration(&mut input) {
65            Ok(c) => c,
66            Err(..) => return false,
67        };
68
69        let url_data = UrlExtraData(win.Document().url().get_arc());
70        let context = ParserContext::new(
71            Origin::Author,
72            &url_data,
73            Some(CssRuleType::Style),
74            ParsingMode::DEFAULT,
75            QuirksMode::NoQuirks,
76            /* namespaces = */ Default::default(),
77            None,
78            None,
79        );
80        cond.eval(&context)
81    }
82
83    /// <https://drafts.css-houdini.org/css-paint-api-1/#paint-worklet>
84    fn PaintWorklet(win: &Window) -> DomRoot<Worklet> {
85        win.paint_worklet()
86    }
87
88    /// <https://drafts.css-houdini.org/css-properties-values-api/#the-registerproperty-function>
89    fn RegisterProperty(window: &Window, property_definition: &PropertyDefinition) -> Fallible<()> {
90        let property_registration = PropertyRegistration {
91            name: property_definition.name.str().to_owned(),
92            inherits: property_definition.inherits,
93            url_data: UrlExtraData(window.get_url().get_arc()),
94            initial_value: property_definition
95                .initialValue
96                .as_ref()
97                .map(|value| value.str().to_owned()),
98            syntax: property_definition.syntax.str().to_owned(),
99        };
100
101        window
102            .layout_mut()
103            .register_custom_property(property_registration)
104            .map_err(|error| match error {
105                RegisterPropertyError::InvalidName |
106                RegisterPropertyError::InvalidSyntax |
107                RegisterPropertyError::InvalidInitialValue |
108                RegisterPropertyError::NoInitialValue |
109                RegisterPropertyError::InitialValueNotComputationallyIndependent => {
110                    Error::Syntax(None)
111                },
112                RegisterPropertyError::AlreadyRegistered => Error::InvalidModification,
113            })?;
114
115        Ok(())
116    }
117}
script/dom/css.rs

script/dom/
css.rs
