mirror of
https://github.com/RGBCube/serenity
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64 lines
2.5 KiB
C++
64 lines
2.5 KiB
C++
/*
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* Copyright (c) 2021-2023, Sam Atkins <atkinssj@serenityos.org>
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* Copyright (c) 2023, Tim Flynn <trflynn89@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/VM.h>
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#include <LibWeb/CSS/CSS.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/PropertyID.h>
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#include <LibWeb/CSS/Serialize.h>
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namespace Web::CSS {
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// https://www.w3.org/TR/cssom-1/#dom-css-escape
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WebIDL::ExceptionOr<String> escape(JS::VM& vm, StringView identifier)
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{
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// The escape(ident) operation must return the result of invoking serialize an identifier of ident.
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return TRY_OR_THROW_OOM(vm, 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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bool supports(JS::VM& vm, StringView property, StringView value)
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{
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auto& realm = *vm.current_realm();
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// 1. 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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if (auto property_id = property_id_from_string(property); property_id.has_value()) {
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if (parse_css_value(Parser::ParsingContext { realm }, value, property_id.value()).release_value_but_fixme_should_propagate_errors())
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return true;
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}
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// 2. 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.starts_with("--"sv) && property.length() >= 3) {
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return true;
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}
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// 3. Otherwise, return false.
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return false;
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}
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// https://www.w3.org/TR/css-conditional-3/#dom-css-supports
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WebIDL::ExceptionOr<bool> supports(JS::VM& vm, StringView condition_text)
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{
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auto& realm = *vm.current_realm();
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// 1. If conditionText, parsed and evaluated as a <supports-condition>, would return true, return true.
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if (auto supports = parse_css_supports(Parser::ParsingContext { realm }, condition_text); supports && supports->matches())
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return true;
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// 2. Otherwise, If conditionText, wrapped in parentheses and then parsed and evaluated as a <supports-condition>, would return true, return true.
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auto wrapped_condition_text = TRY_OR_THROW_OOM(vm, String::formatted("({})", condition_text));
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if (auto supports = parse_css_supports(Parser::ParsingContext { realm }, wrapped_condition_text); supports && supports->matches())
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return true;
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// 3. Otherwise, return false.
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return false;
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}
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}
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