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, &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, &mut decl).unwrap();
42        decl.push_str(": ");
43        decl.push_str(&value);
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 mut input = ParserInput::new(&condition);
62        let mut input = Parser::new(&mut input);
63        let cond = match parse_condition_or_declaration(&mut input) {
64            Ok(c) => c,
65            Err(..) => return false,
66        };
67
68        let url_data = UrlExtraData(win.Document().url().get_arc());
69        let context = ParserContext::new(
70            Origin::Author,
71            &url_data,
72            Some(CssRuleType::Style),
73            ParsingMode::DEFAULT,
74            QuirksMode::NoQuirks,
75            /* namespaces = */ Default::default(),
76            None,
77            None,
78        );
79        cond.eval(&context)
80    }
81
82    /// <https://drafts.css-houdini.org/css-paint-api-1/#paint-worklet>
83    fn PaintWorklet(win: &Window) -> DomRoot<Worklet> {
84        win.paint_worklet()
85    }
86
87    /// <https://drafts.css-houdini.org/css-properties-values-api/#the-registerproperty-function>
88    fn RegisterProperty(window: &Window, property_definition: &PropertyDefinition) -> Fallible<()> {
89        let property_registration = PropertyRegistration {
90            name: property_definition.name.str().to_owned(),
91            inherits: property_definition.inherits,
92            url_data: UrlExtraData(window.get_url().get_arc()),
93            initial_value: property_definition
94                .initialValue
95                .as_ref()
96                .map(|value| value.str().to_owned()),
97            syntax: property_definition.syntax.str().to_owned(),
98        };
99
100        window
101            .layout_mut()
102            .register_custom_property(property_registration)
103            .map_err(|error| match error {
104                RegisterPropertyError::InvalidName |
105                RegisterPropertyError::InvalidSyntax |
106                RegisterPropertyError::InvalidInitialValue |
107                RegisterPropertyError::NoInitialValue |
108                RegisterPropertyError::InitialValueNotComputationallyIndependent => {
109                    Error::Syntax(None)
110                },
111                RegisterPropertyError::AlreadyRegistered => Error::InvalidModification,
112            })?;
113
114        Ok(())
115    }
116}
script/dom/css.rs

script/dom/
css.rs
