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- /*
- * Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
- *
- * SPDX-License-Identifier: BSD-2-Clause
- */
- #include <LibJS/Runtime/ErrorTypes.h>
- #include <LibJS/Runtime/GlobalObject.h>
- #include <LibJS/Runtime/VM.h>
- #include <LibJS/Runtime/Value.h>
- #include <LibWeb/Bindings/CSSNamespace.h>
- #include <LibWeb/CSS/Parser/Parser.h>
- namespace Web::Bindings {
- CSSNamespace::CSSNamespace(JS::GlobalObject& global_object)
- : JS::Object(*global_object.object_prototype())
- {
- }
- CSSNamespace::~CSSNamespace()
- {
- }
- void CSSNamespace::initialize(JS::GlobalObject& global_object)
- {
- Object::initialize(global_object);
- u8 attr = JS::Attribute::Enumerable;
- define_native_function("escape", escape, 1, attr);
- define_native_function("supports", supports, 2, attr);
- }
- // https://www.w3.org/TR/cssom-1/#dom-css-escape
- JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::escape)
- {
- if (!vm.argument_count())
- return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
- auto identifier = TRY(vm.argument(0).to_string(global_object));
- return JS::js_string(vm, Web::CSS::serialize_an_identifier(identifier));
- }
- // https://www.w3.org/TR/css-conditional-3/#dom-css-supports
- JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::supports)
- {
- if (!vm.argument_count())
- return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.supports");
- if (vm.argument_count() >= 2) {
- // When the supports(property, value) method is invoked with two arguments property and value:
- auto property_name = TRY(vm.argument(0).to_string(global_object));
- // If property is an ASCII case-insensitive match for any defined CSS property that the UA supports,
- // and value successfully parses according to that property’s grammar, return true.
- auto property = CSS::property_id_from_string(property_name);
- if (property != CSS::PropertyID::Invalid) {
- auto value_string = TRY(vm.argument(1).to_string(global_object));
- if (parse_css_value({}, value_string, property))
- return JS::Value(true);
- }
- // Otherwise, if property is a custom property name string, return true.
- // FIXME: This check is not enough to make sure this is a valid custom property name, but it's close enough.
- else if (property_name.starts_with("--") && property_name.length() >= 3) {
- return JS::Value(true);
- }
- // Otherwise, return false.
- return JS::Value(false);
- } else {
- // When the supports(conditionText) method is invoked with a single conditionText argument:
- auto supports_text = TRY(vm.argument(0).to_string(global_object));
- // If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.
- if (auto supports = parse_css_supports({}, supports_text); supports && supports->matches())
- return JS::Value(true);
- // Otherwise, If conditionText, wrapped in parentheses and then parsed and evaluated as a <supports-condition>, would return true, return true.
- if (auto supports = parse_css_supports({}, String::formatted("({})", supports_text)); supports && supports->matches())
- return JS::Value(true);
- // Otherwise, return false.
- return JS::Value(false);
- }
- }
- }
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