1 files changed, 139 insertions, 0 deletions
diff --git a/components/layout_2020/table_caption.rs b/components/layout_2020/table_caption.rs
new file mode 100644
index 00000000000..3d44190f986
--- /dev/null
+++ b/components/layout_2020/table_caption.rs
@@ -0,0 +1,139 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at https://mozilla.org/MPL/2.0/. */
+
+//! CSS table formatting contexts.
+
+use crate::block::BlockFlow;
+use crate::context::LayoutContext;
+use crate::display_list::{
+    DisplayListBuildState, StackingContextCollectionFlags, StackingContextCollectionState,
+};
+use crate::flow::{Flow, FlowClass, OpaqueFlow};
+use crate::fragment::{Fragment, FragmentBorderBoxIterator, Overflow};
+use app_units::Au;
+use euclid::Point2D;
+use gfx_traits::print_tree::PrintTree;
+use std::fmt;
+use style::logical_geometry::LogicalSize;
+use style::properties::ComputedValues;
+
+#[allow(unsafe_code)]
+unsafe impl crate::flow::HasBaseFlow for TableCaptionFlow {}
+
+/// A table formatting context.
+#[repr(C)]
+pub struct TableCaptionFlow {
+    pub block_flow: BlockFlow,
+}
+
+impl TableCaptionFlow {
+    pub fn from_fragment(fragment: Fragment) -> TableCaptionFlow {
+        TableCaptionFlow {
+            block_flow: BlockFlow::from_fragment(fragment),
+        }
+    }
+}
+
+impl Flow for TableCaptionFlow {
+    fn class(&self) -> FlowClass {
+        FlowClass::TableCaption
+    }
+
+    fn as_mut_block(&mut self) -> &mut BlockFlow {
+        &mut self.block_flow
+    }
+
+    fn as_block(&self) -> &BlockFlow {
+        &self.block_flow
+    }
+
+    fn bubble_inline_sizes(&mut self) {
+        self.block_flow.bubble_inline_sizes();
+    }
+
+    fn assign_inline_sizes(&mut self, layout_context: &LayoutContext) {
+        debug!(
+            "assign_inline_sizes({}): assigning inline_size for flow",
+            "table_caption"
+        );
+        self.block_flow.assign_inline_sizes(layout_context);
+    }
+
+    fn assign_block_size(&mut self, layout_context: &LayoutContext) {
+        debug!("assign_block_size: assigning block_size for table_caption");
+        self.block_flow.assign_block_size(layout_context);
+    }
+
+    fn compute_stacking_relative_position(&mut self, layout_context: &LayoutContext) {
+        self.block_flow
+            .compute_stacking_relative_position(layout_context)
+    }
+
+    fn update_late_computed_inline_position_if_necessary(&mut self, inline_position: Au) {
+        self.block_flow
+            .update_late_computed_inline_position_if_necessary(inline_position)
+    }
+
+    fn update_late_computed_block_position_if_necessary(&mut self, block_position: Au) {
+        self.block_flow
+            .update_late_computed_block_position_if_necessary(block_position)
+    }
+
+    fn build_display_list(&mut self, state: &mut DisplayListBuildState) {
+        debug!("build_display_list_table_caption: same process as block flow");
+        self.block_flow.build_display_list(state);
+    }
+
+    fn collect_stacking_contexts(&mut self, state: &mut StackingContextCollectionState) {
+        self.block_flow
+            .collect_stacking_contexts_for_block(state, StackingContextCollectionFlags::empty());
+    }
+
+    fn repair_style(&mut self, new_style: &crate::ServoArc<ComputedValues>) {
+        self.block_flow.repair_style(new_style)
+    }
+
+    fn compute_overflow(&self) -> Overflow {
+        self.block_flow.compute_overflow()
+    }
+
+    fn contains_roots_of_absolute_flow_tree(&self) -> bool {
+        self.block_flow.contains_roots_of_absolute_flow_tree()
+    }
+
+    fn is_absolute_containing_block(&self) -> bool {
+        self.block_flow.is_absolute_containing_block()
+    }
+
+    fn generated_containing_block_size(&self, flow: OpaqueFlow) -> LogicalSize<Au> {
+        self.block_flow.generated_containing_block_size(flow)
+    }
+
+    fn iterate_through_fragment_border_boxes(
+        &self,
+        iterator: &mut dyn FragmentBorderBoxIterator,
+        level: i32,
+        stacking_context_position: &Point2D<Au>,
+    ) {
+        self.block_flow.iterate_through_fragment_border_boxes(
+            iterator,
+            level,
+            stacking_context_position,
+        )
+    }
+
+    fn mutate_fragments(&mut self, mutator: &mut dyn FnMut(&mut Fragment)) {
+        self.block_flow.mutate_fragments(mutator)
+    }
+
+    fn print_extra_flow_children(&self, print_tree: &mut PrintTree) {
+        self.block_flow.print_extra_flow_children(print_tree);
+    }
+}
+
+impl fmt::Debug for TableCaptionFlow {
+    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+        write!(f, "TableCaptionFlow: {:?}", self.block_flow)
+    }
+}