mirror of
https://github.com/RGBCube/serenity
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5dd5896588
This is a continuation of the previous commit. Calling initialize() is the first thing that's done after allocating a cell on the JS heap - and in the common case of allocating an object, that's where properties are assigned and intrinsics occasionally accessed. Since those are supposed to live on the realm eventually, this is another step into that direction.
82 lines
3.3 KiB
C++
82 lines
3.3 KiB
C++
/*
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* Copyright (c) 2021, Sam Atkins <atkinssj@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibJS/Runtime/ErrorTypes.h>
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#include <LibJS/Runtime/GlobalObject.h>
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#include <LibJS/Runtime/VM.h>
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#include <LibJS/Runtime/Value.h>
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#include <LibWeb/Bindings/CSSNamespace.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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namespace Web::Bindings {
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CSSNamespace::CSSNamespace(JS::Realm& realm)
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: JS::Object(*realm.global_object().object_prototype())
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{
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}
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void CSSNamespace::initialize(JS::Realm& realm)
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{
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Object::initialize(realm);
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u8 attr = JS::Attribute::Enumerable;
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define_native_function("escape", escape, 1, attr);
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define_native_function("supports", supports, 2, attr);
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}
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// https://www.w3.org/TR/cssom-1/#dom-css-escape
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JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::escape)
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{
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if (!vm.argument_count())
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return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
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auto identifier = TRY(vm.argument(0).to_string(global_object));
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return JS::js_string(vm, Web::CSS::serialize_an_identifier(identifier));
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}
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// https://www.w3.org/TR/css-conditional-3/#dom-css-supports
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JS_DEFINE_NATIVE_FUNCTION(CSSNamespace::supports)
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{
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if (!vm.argument_count())
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return vm.throw_completion<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.supports");
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if (vm.argument_count() >= 2) {
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// When the supports(property, value) method is invoked with two arguments property and value:
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auto property_name = TRY(vm.argument(0).to_string(global_object));
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// If property is an ASCII case-insensitive match for any defined CSS property that the UA supports,
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// and value successfully parses according to that property’s grammar, return true.
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auto property = CSS::property_id_from_string(property_name);
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if (property != CSS::PropertyID::Invalid) {
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auto value_string = TRY(vm.argument(1).to_string(global_object));
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if (parse_css_value({}, value_string, property))
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return JS::Value(true);
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}
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// Otherwise, if property is a custom property name string, return true.
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// FIXME: This check is not enough to make sure this is a valid custom property name, but it's close enough.
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else if (property_name.starts_with("--"sv) && property_name.length() >= 3) {
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return JS::Value(true);
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}
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// Otherwise, return false.
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return JS::Value(false);
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} else {
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// When the supports(conditionText) method is invoked with a single conditionText argument:
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auto supports_text = TRY(vm.argument(0).to_string(global_object));
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// If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.
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if (auto supports = parse_css_supports({}, supports_text); supports && supports->matches())
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return JS::Value(true);
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// Otherwise, If conditionText, wrapped in parentheses and then parsed and evaluated as a <supports-condition>, would return true, return true.
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if (auto supports = parse_css_supports({}, String::formatted("({})", supports_text)); supports && supports->matches())
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return JS::Value(true);
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// Otherwise, return false.
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return JS::Value(false);
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}
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}
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}
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