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92 lines
3.2 KiB
C++
92 lines
3.2 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::GlobalObject& global_object)
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: JS::Object(*global_object.object_prototype())
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{
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}
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CSSNamespace::~CSSNamespace()
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{
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}
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void CSSNamespace::initialize(JS::GlobalObject& global_object)
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{
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Object::initialize(global_object);
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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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vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.escape");
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return {};
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}
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String result = Web::CSS::serialize_an_identifier(vm.argument(0).to_string(global_object));
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if (vm.exception())
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return {};
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return JS::Value(JS::js_string(vm, result));
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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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vm.throw_exception<JS::TypeError>(global_object, JS::ErrorType::BadArgCountAtLeastOne, "CSS.supports");
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return {};
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}
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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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String property_name = vm.argument(0).to_string(global_object);
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if (vm.exception())
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return {};
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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 = vm.argument(1).to_string(global_object);
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if (vm.exception())
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return {};
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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("--") && 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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//
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// If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.
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//
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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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//
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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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