mirror of
https://github.com/mozilla/gecko-dev.git
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b32a9cd993
Sorry for not doing it yesterday, I couldn't. cc @metajack @SimonSapin Source-Repo: https://github.com/servo/servo Source-Revision: 4ebb95ccd8e034007eacb447a054919ef4af2bf7
214 lines
8.8 KiB
Rust
214 lines
8.8 KiB
Rust
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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//! Layout for elements with a CSS `display` property of `list-item`. These elements consist of a
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//! block and an extra inline fragment for the marker.
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#![deny(unsafe_code)]
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use block::BlockFlow;
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use context::LayoutContext;
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use display_list_builder::ListItemFlowDisplayListBuilding;
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use floats::FloatKind;
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use flow::{Flow, FlowClass, OpaqueFlow};
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use fragment::{CoordinateSystem, Fragment, FragmentBorderBoxIterator, GeneratedContentInfo};
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use generated_content;
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use incremental::RESOLVE_GENERATED_CONTENT;
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use inline::InlineMetrics;
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use text;
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use wrapper::ThreadSafeLayoutNode;
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use euclid::{Point2D, Rect};
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use gfx::display_list::DisplayList;
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use util::geometry::Au;
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use util::logical_geometry::LogicalSize;
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use util::opts;
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use style::properties::ComputedValues;
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use style::computed_values::list_style_type;
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use std::sync::Arc;
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/// A block with the CSS `display` property equal to `list-item`.
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#[derive(Debug)]
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pub struct ListItemFlow {
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/// Data common to all block flows.
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pub block_flow: BlockFlow,
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/// The marker, if outside. (Markers that are inside are instead just fragments on the interior
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/// `InlineFlow`.)
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pub marker: Option<Fragment>,
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}
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impl ListItemFlow {
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pub fn from_node_fragments_and_flotation(node: &ThreadSafeLayoutNode,
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main_fragment: Fragment,
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marker_fragment: Option<Fragment>,
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flotation: Option<FloatKind>)
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-> ListItemFlow {
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let mut this = ListItemFlow {
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block_flow: BlockFlow::from_node_and_fragment(node, main_fragment, flotation),
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marker: marker_fragment,
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};
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if let Some(ref marker) = this.marker {
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match marker.style().get_list().list_style_type {
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list_style_type::T::disc |
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list_style_type::T::none |
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list_style_type::T::circle |
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list_style_type::T::square |
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list_style_type::T::disclosure_open |
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list_style_type::T::disclosure_closed => {}
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_ => this.block_flow.base.restyle_damage.insert(RESOLVE_GENERATED_CONTENT),
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}
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}
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this
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}
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}
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impl Flow for ListItemFlow {
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fn class(&self) -> FlowClass {
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FlowClass::ListItem
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}
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fn as_block<'a>(&'a mut self) -> &'a mut BlockFlow {
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&mut self.block_flow
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}
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fn bubble_inline_sizes(&mut self) {
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// The marker contributes no intrinsic inline-size, so…
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self.block_flow.bubble_inline_sizes()
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}
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fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
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self.block_flow.assign_inline_sizes(layout_context);
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if let Some(ref mut marker) = self.marker {
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let containing_block_inline_size = self.block_flow.base.block_container_inline_size;
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marker.assign_replaced_inline_size_if_necessary(containing_block_inline_size);
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// Do this now. There's no need to do this in bubble-widths, since markers do not
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// contribute to the inline size of this flow.
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let intrinsic_inline_sizes = marker.compute_intrinsic_inline_sizes();
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marker.border_box.size.inline =
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intrinsic_inline_sizes.content_intrinsic_sizes.preferred_inline_size;
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marker.border_box.start.i = self.block_flow.fragment.border_box.start.i -
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marker.border_box.size.inline;
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}
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}
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fn assign_block_size<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
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self.block_flow.assign_block_size(layout_context);
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if let Some(ref mut marker) = self.marker {
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let containing_block_block_size =
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self.block_flow.base.block_container_explicit_block_size.unwrap_or(Au(0));
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marker.assign_replaced_block_size_if_necessary(containing_block_block_size);
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let font_metrics =
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text::font_metrics_for_style(&mut layout_context.font_context(),
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marker.style.get_font_arc());
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let line_height = text::line_height_from_style(&*marker.style, &font_metrics);
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let item_inline_metrics = InlineMetrics::from_font_metrics(&font_metrics, line_height);
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let marker_inline_metrics = marker.inline_metrics(layout_context);
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marker.border_box.start.b = item_inline_metrics.block_size_above_baseline -
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marker_inline_metrics.block_size_above_baseline;
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marker.border_box.size.block = marker_inline_metrics.block_size_above_baseline;
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}
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}
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fn compute_absolute_position(&mut self, layout_context: &LayoutContext) {
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self.block_flow.compute_absolute_position(layout_context)
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}
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fn place_float_if_applicable<'a>(&mut self, layout_context: &'a LayoutContext<'a>) {
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self.block_flow.place_float_if_applicable(layout_context)
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}
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fn update_late_computed_inline_position_if_necessary(&mut self, inline_position: Au) {
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self.block_flow.update_late_computed_inline_position_if_necessary(inline_position)
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}
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fn update_late_computed_block_position_if_necessary(&mut self, block_position: Au) {
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self.block_flow.update_late_computed_block_position_if_necessary(block_position)
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}
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fn build_display_list(&mut self, layout_context: &LayoutContext) {
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self.build_display_list_for_list_item(box DisplayList::new(), layout_context);
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if opts::get().validate_display_list_geometry {
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self.block_flow.base.validate_display_list_geometry();
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}
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}
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fn repair_style(&mut self, new_style: &Arc<ComputedValues>) {
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self.block_flow.repair_style(new_style)
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}
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fn compute_overflow(&self) -> Rect<Au> {
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self.block_flow.compute_overflow()
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}
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fn generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
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self.block_flow.generated_containing_block_size(flow)
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}
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fn iterate_through_fragment_border_boxes(&self,
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iterator: &mut FragmentBorderBoxIterator,
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stacking_context_position: &Point2D<Au>) {
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self.block_flow.iterate_through_fragment_border_boxes(iterator, stacking_context_position);
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if let Some(ref marker) = self.marker {
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if iterator.should_process(marker) {
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iterator.process(
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marker,
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&marker.stacking_relative_border_box(&self.block_flow
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.base
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.stacking_relative_position,
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&self.block_flow
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.base
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.absolute_position_info
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.relative_containing_block_size,
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self.block_flow
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.base
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.absolute_position_info
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.relative_containing_block_mode,
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CoordinateSystem::Own)
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.translate(stacking_context_position));
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}
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}
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}
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fn mutate_fragments(&mut self, mutator: &mut FnMut(&mut Fragment)) {
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self.block_flow.mutate_fragments(mutator);
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if let Some(ref mut marker) = self.marker {
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(*mutator)(marker)
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}
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}
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}
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/// The kind of content that `list-style-type` results in.
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pub enum ListStyleTypeContent {
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None,
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StaticText(char),
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GeneratedContent(Box<GeneratedContentInfo>),
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}
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impl ListStyleTypeContent {
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/// Returns the content to be used for the given value of the `list-style-type` property.
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pub fn from_list_style_type(list_style_type: list_style_type::T) -> ListStyleTypeContent {
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// Just to keep things simple, use a nonbreaking space (Unicode 0xa0) to provide the marker
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// separation.
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match list_style_type {
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list_style_type::T::none => ListStyleTypeContent::None,
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list_style_type::T::disc | list_style_type::T::circle | list_style_type::T::square |
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list_style_type::T::disclosure_open | list_style_type::T::disclosure_closed => {
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let text = generated_content::static_representation(list_style_type);
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ListStyleTypeContent::StaticText(text)
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}
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_ => ListStyleTypeContent::GeneratedContent(box GeneratedContentInfo::ListItem),
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}
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}
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}
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