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2a96a81e68
The spec is unclear about when exactly we should parse the style sheet. Previously we'd do so before calling this algorithm, which was error-prone, as seen by the bug fixed by the previous commit. The spec for step 1 of "create a CSS style sheet" says: 1. Create a new CSS style sheet object and set its properties as specified. The definitions linked are UA-defined enough that it seems reasonable to put the parsing here. That simplifies the user code a little and makes it harder to mess up. It does raise the question of what to do if parsing fails. I've matched our previous behaviour by just logging and returning in that case. While I'm modifying this method, I've also converted the bool params to enums so they're a little clearer to read.
98 lines
3.9 KiB
C++
98 lines
3.9 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() && !Infra::is_ascii_case_insensitive_match(type_attribute->bytes_as_string_view(), "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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{},
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nullptr,
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nullptr);
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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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