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579730d861
Which has an optmization if both size of the string being passed through are FlyStrings, which actually ends up being the case in some places during selector matching comparing attribute names. Instead of maintaining more overloads of Infra::is_ascii_case_insensitive_match, switch everything over to equals_ignoring_ascii_case instead.
105 lines
4.5 KiB
C++
105 lines
4.5 KiB
C++
/*
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* Copyright (c) 2023, Preston Taylor <PrestonLeeTaylor@proton.me>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibWeb/CSS/Parser/Parser.h>
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#include <LibWeb/CSS/StyleComputer.h>
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#include <LibWeb/DOM/Document.h>
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#include <LibWeb/DOM/ShadowRoot.h>
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#include <LibWeb/DOM/StyleElementUtils.h>
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#include <LibWeb/Infra/Strings.h>
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namespace Web::DOM {
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// The user agent must run the "update a style block" algorithm whenever one of the following conditions occur:
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// FIXME: The element is popped off the stack of open elements of an HTML parser or XML parser.
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//
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// NOTE: This is basically done by children_changed() today:
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// The element's children changed steps run.
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//
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// NOTE: This is basically done by inserted() and removed_from() today:
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// The element is not on the stack of open elements of an HTML parser or XML parser, and it becomes connected or disconnected.
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//
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// https://html.spec.whatwg.org/multipage/semantics.html#update-a-style-block
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void StyleElementUtils::update_a_style_block(DOM::Element& style_element)
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{
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// OPTIMIZATION: Skip parsing CSS if we're in the middle of parsing a HTML fragment.
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// The style block will be parsed upon insertion into a proper document.
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if (style_element.document().is_temporary_document_for_fragment_parsing())
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return;
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// 1. Let element be the style element.
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// 2. If element has an associated CSS style sheet, remove the CSS style sheet in question.
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if (m_associated_css_style_sheet) {
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m_style_sheet_list->remove_a_css_style_sheet(*m_associated_css_style_sheet);
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m_style_sheet_list = nullptr;
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// FIXME: This should probably be handled by StyleSheet::set_owner_node().
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m_associated_css_style_sheet = nullptr;
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}
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// 3. If element is not connected, then return.
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if (!style_element.is_connected())
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return;
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// 4. If element's type attribute is present and its value is neither the empty string nor an ASCII case-insensitive match for "text/css", then return.
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auto type_attribute = style_element.attribute(HTML::AttributeNames::type);
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if (type_attribute.has_value() && !type_attribute->is_empty() && !type_attribute->bytes_as_string_view().equals_ignoring_ascii_case("text/css"sv))
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return;
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// FIXME: 5. If the Should element's inline behavior be blocked by Content Security Policy? algorithm returns "Blocked" when executed upon the style element, "style", and the style element's child text content, then return. [CSP]
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// 6. Create a CSS style sheet with the following properties:
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// type
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// text/css
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// owner node
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// element
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// media
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// The media attribute of element.
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// title
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// The title attribute of element, if element is in a document tree, or the empty string otherwise.
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// alternate flag
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// Unset.
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// origin-clean flag
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// Set.
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// location
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// parent CSS style sheet
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// owner CSS rule
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// null
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// disabled flag
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// Left at its default value.
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// CSS rules
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// Left uninitialized.
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m_style_sheet_list = style_element.document_or_shadow_root_style_sheets();
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m_associated_css_style_sheet = m_style_sheet_list->create_a_css_style_sheet(
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style_element.text_content().value_or(String {}),
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"text/css"_string,
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&style_element,
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style_element.attribute(HTML::AttributeNames::media).value_or({}),
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style_element.in_a_document_tree()
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? style_element.attribute(HTML::AttributeNames::title).value_or({})
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: String {},
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CSS::StyleSheetList::Alternate::No,
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CSS::StyleSheetList::OriginClean::Yes,
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// AD-HOC: Use the document's base URL as the location instead. Spec issue: https://github.com/whatwg/html/issues/11281
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style_element.document().base_url(),
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nullptr,
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nullptr);
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// 7. If element contributes a script-blocking style sheet, append element to its node document's script-blocking style sheet set.
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if (style_element.contributes_a_script_blocking_style_sheet())
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style_element.document().script_blocking_style_sheet_set().set(style_element);
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// FIXME: 8. If element's media attribute's value matches the environment and element is potentially render-blocking, then block rendering on element.
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}
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void StyleElementUtils::visit_edges(JS::Cell::Visitor& visitor)
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{
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visitor.visit(m_associated_css_style_sheet);
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visitor.visit(m_style_sheet_list);
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}
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}
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