mirror of
https://github.com/RGBCube/serenity
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2692db8699
Note that as of this commit, there aren't any such throwers, and the call site in Heap::allocate will drop exceptions on the floor. This commit only serves to change the declaration of the overrides, make sure they return an empty value, and to propagate OOM errors frm their base initialize invocations.
84 lines
3.3 KiB
C++
84 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(ConstructWithPrototypeTag::Tag, *realm.intrinsics().object_prototype())
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{
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}
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JS::ThrowCompletionOr<void> CSSNamespace::initialize(JS::Realm& realm)
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{
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MUST_OR_THROW_OOM(Object::initialize(realm));
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u8 attr = JS::Attribute::Enumerable;
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define_native_function(realm, "escape", escape, 1, attr);
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define_native_function(realm, "supports", supports, 2, attr);
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return {};
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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>(JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
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auto identifier = TRY(vm.argument(0).to_deprecated_string(vm));
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return JS::PrimitiveString::create(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>(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_deprecated_string(vm));
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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_deprecated_string(vm));
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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_deprecated_string(vm));
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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({}, DeprecatedString::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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