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38 lines
1.5 KiB
C++
38 lines
1.5 KiB
C++
/*
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* Copyright (c) 2024, Sam Atkins <sam@ladybird.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include "PseudoElementParsing.h"
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#include <LibWeb/CSS/Parser/Parser.h>
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namespace Web::Animations {
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// https://drafts.csswg.org/web-animations-1/#dom-keyframeeffect-pseudo-element-parsing
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WebIDL::ExceptionOr<Optional<CSS::Selector::PseudoElement>> pseudo_element_parsing(JS::Realm& realm, Optional<String> const& value)
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{
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// 1. Given the value value, perform the following steps:
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// 2. If value is not null and is an invalid <pseudo-element-selector>,
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Optional<CSS::Selector::PseudoElement> pseudo_element;
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if (value.has_value()) {
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pseudo_element = parse_pseudo_element_selector(CSS::Parser::ParsingContext { realm }, *value);
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if (!pseudo_element.has_value()) {
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// 1. Throw a DOMException with error name "SyntaxError".
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// 2. Abort.
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return WebIDL::SyntaxError::create(realm, MUST(String::formatted("Invalid pseudo-element selector: \"{}\"", value.value())));
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}
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}
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// 3. If value is one of the legacy Selectors Level 2 single-colon selectors (':before', ':after', ':first-letter', or ':first-line'),
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// then return the equivalent two-colon selector (e.g. '::before').
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if (value.has_value() && value->is_one_of(":before", ":after", ":first-letter", ":first-line")) {
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return CSS::Selector::PseudoElement::from_string(MUST(value->substring_from_byte_offset(1)));
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}
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// 4. Otherwise, return value.
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return pseudo_element;
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}
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}
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