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d5cddd4696
Previously, the parent CSS stylesheet, owner node and owner CSS rule properties were not unset when removing a sheet from a StyleSheetList. This change moves the methods for adding and removing sheets to and from a StyleSheetList, directly into the StyleSheetList class and ensures they are called as required by the CSSOM specification.
78 lines
3.4 KiB
C++
78 lines
3.4 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/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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style_element.document_or_shadow_root_style_sheets().remove_a_css_style_sheet(*m_associated_css_style_sheet);
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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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// FIXME: This is a bit awkward, as the spec doesn't actually tell us when to parse the CSS text,
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// so we just do it here and pass the parsed sheet to create_a_css_style_sheet().
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auto* sheet = parse_css_stylesheet(CSS::Parser::ParsingContext(style_element.document()), style_element.text_content().value_or(String {}));
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if (!sheet)
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return;
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// FIXME: This should probably be handled by StyleSheet::set_owner_node().
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m_associated_css_style_sheet = sheet;
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// 6. Create a CSS style sheet with the following properties...
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style_element.document_or_shadow_root_style_sheets().create_a_css_style_sheet(
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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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false,
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true,
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{},
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nullptr,
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nullptr,
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*sheet);
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}
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}
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