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https://github.com/LadybirdBrowser/ladybird.git
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bbb96d65b1
When inserting a node into a parent, any live DOM ranges that reference the parent may need to be updated. The spec does this by increasing or decreasing the start/end offsets of each live range *before* actually performing the insertion. This caused us to crash with a verification failure, since it was possible to set the range offset to an invalid value (that would go on to immediately become valid after the insertion was finished). This patch fixes the issue by adding special badged helpers on Range for Node to reach into it and increase/decrease the offsets during node insertion. This skips the offset validity check and actually makes our code read slightly more like the spec. Found by Domato :^)
132 lines
4.8 KiB
C++
132 lines
4.8 KiB
C++
/*
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* Copyright (c) 2020, the SerenityOS developers.
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* Copyright (c) 2022, Luke Wilde <lukew@serenityos.org>
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* Copyright (c) 2022-2023, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <LibWeb/DOM/AbstractRange.h>
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#include <LibWeb/Selection/Selection.h>
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#include <LibWeb/WebIDL/Types.h>
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namespace Web::DOM {
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enum class RelativeBoundaryPointPosition {
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Equal,
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Before,
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After,
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};
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// https://dom.spec.whatwg.org/#concept-range-bp-position
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RelativeBoundaryPointPosition position_of_boundary_point_relative_to_other_boundary_point(Node const& node_a, u32 offset_a, Node const& node_b, u32 offset_b);
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class Range final : public AbstractRange {
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WEB_PLATFORM_OBJECT(Range, AbstractRange);
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JS_DECLARE_ALLOCATOR(Range);
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public:
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[[nodiscard]] static JS::NonnullGCPtr<Range> create(Document&);
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[[nodiscard]] static JS::NonnullGCPtr<Range> create(HTML::Window&);
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[[nodiscard]] static JS::NonnullGCPtr<Range> create(Node& start_container, WebIDL::UnsignedLong start_offset, Node& end_container, WebIDL::UnsignedLong end_offset);
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static WebIDL::ExceptionOr<JS::NonnullGCPtr<Range>> construct_impl(JS::Realm&);
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virtual ~Range() override;
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// FIXME: There are a ton of methods missing here.
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WebIDL::ExceptionOr<void> set_start(Node& node, WebIDL::UnsignedLong offset);
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WebIDL::ExceptionOr<void> set_end(Node& node, WebIDL::UnsignedLong offset);
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WebIDL::ExceptionOr<void> set_start_before(Node& node);
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WebIDL::ExceptionOr<void> set_start_after(Node& node);
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WebIDL::ExceptionOr<void> set_end_before(Node& node);
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WebIDL::ExceptionOr<void> set_end_after(Node& node);
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WebIDL::ExceptionOr<void> select_node(Node& node);
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void collapse(bool to_start);
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WebIDL::ExceptionOr<void> select_node_contents(Node&);
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void increase_start_offset(Badge<Node>, WebIDL::UnsignedLong);
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void increase_end_offset(Badge<Node>, WebIDL::UnsignedLong);
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void decrease_start_offset(Badge<Node>, WebIDL::UnsignedLong);
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void decrease_end_offset(Badge<Node>, WebIDL::UnsignedLong);
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// https://dom.spec.whatwg.org/#dom-range-start_to_start
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enum HowToCompareBoundaryPoints : WebIDL::UnsignedShort {
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START_TO_START = 0,
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START_TO_END = 1,
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END_TO_END = 2,
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END_TO_START = 3,
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};
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WebIDL::ExceptionOr<WebIDL::Short> compare_boundary_points(WebIDL::UnsignedShort how, Range const& source_range) const;
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JS::NonnullGCPtr<Range> inverted() const;
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JS::NonnullGCPtr<Range> normalized() const;
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JS::NonnullGCPtr<Range> clone_range() const;
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JS::NonnullGCPtr<Node> common_ancestor_container() const;
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// https://dom.spec.whatwg.org/#dom-range-detach
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void detach() const
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{
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// The detach() method steps are to do nothing.
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// Note: Its functionality (disabling a Range object) was removed, but the method itself is preserved for compatibility.
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}
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bool intersects_node(Node const&) const;
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WebIDL::ExceptionOr<bool> is_point_in_range(Node const&, WebIDL::UnsignedLong offset) const;
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WebIDL::ExceptionOr<WebIDL::Short> compare_point(Node const&, WebIDL::UnsignedLong offset) const;
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WebIDL::ExceptionOr<void> delete_contents();
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WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> extract_contents();
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WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> clone_contents();
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WebIDL::ExceptionOr<void> insert_node(JS::NonnullGCPtr<Node>);
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WebIDL::ExceptionOr<void> surround_contents(JS::NonnullGCPtr<Node> new_parent);
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String to_string() const;
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static HashTable<Range*>& live_ranges();
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JS::NonnullGCPtr<Geometry::DOMRectList> get_client_rects() const;
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JS::NonnullGCPtr<Geometry::DOMRect> get_bounding_client_rect() const;
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bool contains_node(Node const&) const;
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void set_associated_selection(Badge<Selection::Selection>, JS::GCPtr<Selection::Selection>);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> create_contextual_fragment(String const& fragment);
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private:
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explicit Range(Document&);
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Range(Node& start_container, WebIDL::UnsignedLong start_offset, Node& end_container, WebIDL::UnsignedLong end_offset);
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virtual void initialize(JS::Realm&) override;
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virtual void visit_edges(Cell::Visitor&) override;
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Node& root();
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Node const& root() const;
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void update_associated_selection();
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enum class StartOrEnd {
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Start,
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End,
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};
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WebIDL::ExceptionOr<void> set_start_or_end(Node& node, u32 offset, StartOrEnd start_or_end);
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WebIDL::ExceptionOr<void> select(Node& node);
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WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> extract();
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WebIDL::ExceptionOr<JS::NonnullGCPtr<DocumentFragment>> clone_the_contents();
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WebIDL::ExceptionOr<void> insert(JS::NonnullGCPtr<Node>);
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bool partially_contains_node(Node const&) const;
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JS::GCPtr<Selection::Selection> m_associated_selection;
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};
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}
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