mirror of
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115 lines
4.5 KiB
C++
115 lines
4.5 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2023, Luke Wilde <lukew@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 <LibWeb/Bindings/Intrinsics.h>
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/Parser/ParsingContext.h>
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#include <LibWeb/CSS/PropertyID.h>
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#include <LibWeb/CSS/StyleValues/ColorStyleValue.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/HTML/HTMLMetaElement.h>
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#include <LibWeb/Infra/CharacterTypes.h>
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#include <LibWeb/Page/Page.h>
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namespace Web::HTML {
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JS_DEFINE_ALLOCATOR(HTMLMetaElement);
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HTMLMetaElement::HTMLMetaElement(DOM::Document& document, DOM::QualifiedName qualified_name)
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: HTMLElement(document, move(qualified_name))
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{
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}
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HTMLMetaElement::~HTMLMetaElement() = default;
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void HTMLMetaElement::initialize(JS::Realm& realm)
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{
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Base::initialize(realm);
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set_prototype(&Bindings::ensure_web_prototype<Bindings::HTMLMetaElementPrototype>(realm, "HTMLMetaElement"_fly_string));
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}
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Optional<HTMLMetaElement::HttpEquivAttributeState> HTMLMetaElement::http_equiv_state() const
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{
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auto value = get_attribute_value(HTML::AttributeNames::http_equiv);
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#define __ENUMERATE_HTML_META_HTTP_EQUIV_ATTRIBUTE(keyword, state) \
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if (value.equals_ignoring_ascii_case(#keyword##sv)) \
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return HTMLMetaElement::HttpEquivAttributeState::state;
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ENUMERATE_HTML_META_HTTP_EQUIV_ATTRIBUTES
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#undef __ENUMERATE_HTML_META_HTTP_EQUIV_ATTRIBUTE
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return OptionalNone {};
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}
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void HTMLMetaElement::inserted()
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{
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Base::inserted();
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// https://html.spec.whatwg.org/multipage/semantics.html#meta-theme-color
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// 1. To obtain a page's theme color, user agents must run the following steps:
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// * The element is in a document tree
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// * The element has a name attribute, whose value is an ASCII case-insensitive match for theme-color
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// * The element has a content attribute
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auto content = attribute(AttributeNames::content);
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if (name().has_value() && name()->equals_ignoring_ascii_case("theme-color"sv) && content.has_value()) {
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auto context = CSS::Parser::ParsingContext { document() };
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// 2. For each element in candidate elements:
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// 1. If element has a media attribute and the value of element's media attribute does not match the environment, then continue.
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auto media = attribute(AttributeNames::media);
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if (media.has_value()) {
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auto query = parse_media_query(context, media.value());
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if (!query->evaluate(document().window()))
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return;
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}
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// 2. Let value be the result of stripping leading and trailing ASCII whitespace from the value of element's content attribute.
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auto value = content->bytes_as_string_view().trim(Infra::ASCII_WHITESPACE);
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// 3. Let color be the result of parsing value.
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auto css_value = parse_css_value(context, value, CSS::PropertyID::Color);
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if (css_value.is_null() || !css_value->is_color())
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return;
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auto color = css_value->as_color().color();
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// 4. If color is not failure, then return color.
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document().page().client().page_did_change_theme_color(color);
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return;
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}
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// https://html.spec.whatwg.org/multipage/semantics.html#pragma-directives
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// When a meta element is inserted into the document, if its http-equiv attribute is present and represents one of
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// the above states, then the user agent must run the algorithm appropriate for that state, as described in the
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// following list:
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auto http_equiv = http_equiv_state();
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if (http_equiv.has_value()) {
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switch (http_equiv.value()) {
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case HttpEquivAttributeState::Refresh: {
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// https://html.spec.whatwg.org/multipage/semantics.html#attr-meta-http-equiv-refresh
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// 1. If the meta element has no content attribute, or if that attribute's value is the empty string, then return.
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// 2. Let input be the value of the element's content attribute.
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if (!has_attribute(AttributeNames::content))
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break;
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auto input = get_attribute_value(AttributeNames::content);
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if (input.is_empty())
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break;
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// 3. Run the shared declarative refresh steps with the meta element's node document, input, and the meta element.
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document().shared_declarative_refresh_steps(input, this);
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break;
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}
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default:
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dbgln("FIXME: Implement '{}' http-equiv state", get_attribute_value(AttributeNames::http_equiv));
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break;
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}
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}
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}
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}
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