mirror of
https://github.com/servo/servo.git
synced 2025-06-06 16:45:39 +00:00
1f23ec2b27
This doesn't really have observable behavior right now, as much as I tried to trigger some kind of bug. On the other hand, it's just wrong and is very obvious when you dump the Fragment tree. If you create a `display: table-cell` that is a child of the `<body>` all parts of the anonymous table are flagged as if they are the `<body>` element.
1069 lines
42 KiB
Rust
1069 lines
42 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 https://mozilla.org/MPL/2.0/. */
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use std::borrow::Cow;
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use std::convert::{TryFrom, TryInto};
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use std::iter::repeat;
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use log::warn;
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use script_layout_interface::wrapper_traits::ThreadSafeLayoutNode;
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use servo_arc::Arc;
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use style::properties::ComputedValues;
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use style::selector_parser::PseudoElement;
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use style::str::char_is_whitespace;
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use style::values::specified::TextDecorationLine;
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use super::{
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Table, TableSlot, TableSlotCell, TableSlotCoordinates, TableSlotOffset, TableTrack,
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TableTrackGroup, TableTrackGroupType,
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};
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use crate::context::LayoutContext;
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use crate::dom::{BoxSlot, NodeExt};
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use crate::dom_traversal::{Contents, NodeAndStyleInfo, NonReplacedContents, TraversalHandler};
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use crate::flow::{BlockContainerBuilder, BlockFormattingContext};
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use crate::formatting_contexts::{
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IndependentFormattingContext, NonReplacedFormattingContext,
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NonReplacedFormattingContextContents,
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};
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use crate::fragment_tree::BaseFragmentInfo;
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use crate::style_ext::{DisplayGeneratingBox, DisplayLayoutInternal};
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/// A reference to a slot and its coordinates in the table
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#[derive(Clone, Copy, Debug)]
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pub(super) struct ResolvedSlotAndLocation<'a> {
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pub cell: &'a TableSlotCell,
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pub coords: TableSlotCoordinates,
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}
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impl<'a> ResolvedSlotAndLocation<'a> {
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fn covers_cell_at(&self, coords: TableSlotCoordinates) -> bool {
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let covered_in_x =
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coords.x >= self.coords.x && coords.x < self.coords.x + self.cell.colspan;
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let covered_in_y = coords.y >= self.coords.y &&
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(self.cell.rowspan == 0 || coords.y < self.coords.y + self.cell.rowspan);
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covered_in_x && covered_in_y
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}
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}
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pub(crate) enum AnonymousTableContent<'dom, Node> {
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Text(NodeAndStyleInfo<Node>, Cow<'dom, str>),
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Element {
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info: NodeAndStyleInfo<Node>,
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display: DisplayGeneratingBox,
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contents: Contents,
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box_slot: BoxSlot<'dom>,
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},
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}
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impl Table {
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pub(crate) fn construct<'dom>(
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context: &LayoutContext,
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info: &NodeAndStyleInfo<impl NodeExt<'dom>>,
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contents: NonReplacedContents,
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propagated_text_decoration_line: TextDecorationLine,
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) -> Self {
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let text_decoration_line =
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propagated_text_decoration_line | info.style.clone_text_decoration_line();
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let mut traversal = TableBuilderTraversal::new(context, info, text_decoration_line);
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contents.traverse(context, info, &mut traversal);
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traversal.finish()
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}
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pub(crate) fn construct_anonymous<'dom, Node>(
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context: &LayoutContext,
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parent_info: &NodeAndStyleInfo<Node>,
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contents: Vec<AnonymousTableContent<'dom, Node>>,
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propagated_text_decoration_line: style::values::specified::TextDecorationLine,
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) -> IndependentFormattingContext
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where
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Node: crate::dom::NodeExt<'dom>,
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{
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let anonymous_style = context
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.shared_context()
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.stylist
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.style_for_anonymous::<Node::ConcreteElement>(
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&context.shared_context().guards,
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&PseudoElement::ServoAnonymousTable,
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&parent_info.style,
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);
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let anonymous_info = parent_info.new_anonymous(anonymous_style.clone());
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let mut table_builder =
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TableBuilderTraversal::new(context, &anonymous_info, propagated_text_decoration_line);
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for content in contents {
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match content {
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AnonymousTableContent::Element {
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info,
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display,
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contents,
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box_slot,
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} => {
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table_builder.handle_element(&info, display, contents, box_slot);
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},
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AnonymousTableContent::Text(..) => {
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// This only happens if there was whitespace between our internal table elements.
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// We only collect that whitespace in case we need to re-emit trailing whitespace
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// after we've added our anonymous table.
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},
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}
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}
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let mut table = table_builder.finish();
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table.anonymous = true;
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IndependentFormattingContext::NonReplaced(NonReplacedFormattingContext {
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base_fragment_info: (&anonymous_info).into(),
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style: anonymous_style,
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content_sizes: None,
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contents: NonReplacedFormattingContextContents::Table(table),
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})
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}
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/// Push a new slot into the last row of this table.
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fn push_new_slot_to_last_row(&mut self, slot: TableSlot) {
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let last_row = match self.slots.last_mut() {
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Some(row) => row,
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None => {
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unreachable!("Should have some rows before calling `push_new_slot_to_last_row`")
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},
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};
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self.size.width = self.size.width.max(last_row.len() + 1);
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last_row.push(slot);
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}
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/// Find [`ResolvedSlotAndLocation`] of all the slots that cover the slot at the given
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/// coordinates. This recursively resolves all of the [`TableSlotCell`]s that cover
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/// the target and returns a [`ResolvedSlotAndLocation`] for each of them. If there is
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/// no slot at the given coordinates or that slot is an empty space, an empty vector
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/// is returned.
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pub(super) fn resolve_slot_at(
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&self,
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coords: TableSlotCoordinates,
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) -> Vec<ResolvedSlotAndLocation<'_>> {
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let slot = self.get_slot(coords);
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match slot {
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Some(TableSlot::Cell(cell)) => vec![ResolvedSlotAndLocation { cell, coords }],
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Some(TableSlot::Spanned(ref offsets)) => offsets
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.iter()
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.flat_map(|offset| self.resolve_slot_at(coords - *offset))
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.collect(),
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Some(TableSlot::Empty) | None => {
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warn!("Tried to resolve an empty or nonexistant slot!");
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vec![]
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},
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}
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}
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/// Create a [`TableSlot::Spanned`] for the target cell at the given coordinates. If
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/// no slots cover the target, then this returns [`None`]. Note: This does not handle
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/// slots that cover the target using `colspan`, but instead only considers slots that
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/// cover this slot via `rowspan`. `colspan` should be handled by appending to the
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/// return value of this function.
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fn create_spanned_slot_based_on_cell_above(
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&self,
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target_coords: TableSlotCoordinates,
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) -> Option<TableSlot> {
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let coords_for_slot_above =
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TableSlotCoordinates::new(target_coords.x, self.slots.len() - 2);
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let slots_covering_slot_above = self.resolve_slot_at(coords_for_slot_above);
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let coords_of_slots_that_cover_target: Vec<_> = slots_covering_slot_above
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.into_iter()
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.filter(|slot| slot.covers_cell_at(target_coords))
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.map(|slot| target_coords - slot.coords)
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.collect();
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if coords_of_slots_that_cover_target.is_empty() {
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None
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} else {
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Some(TableSlot::Spanned(coords_of_slots_that_cover_target))
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}
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}
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}
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impl TableSlot {
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/// Merge a TableSlot::Spanned(x, y) with this (only for model errors)
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pub fn push_spanned(&mut self, new_offset: TableSlotOffset) {
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match *self {
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TableSlot::Cell { .. } => {
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panic!("Should never have a table model error with an originating cell slot overlapping a spanned slot")
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},
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TableSlot::Spanned(ref mut vec) => vec.insert(0, new_offset),
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TableSlot::Empty => {
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panic!("Should never have a table model error with an empty slot");
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},
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}
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}
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}
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pub struct TableBuilder {
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/// The table that we are building.
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table: Table,
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/// An incoming rowspan is a value indicating that a cell in a row above the current row,
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/// had a rowspan value other than 1. The values in this array indicate how many more
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/// rows the cell should span. For example, a value of 0 at an index before `current_x()`
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/// indicates that the cell on that column will not span into the next row, and at an index
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/// after `current_x()` it indicates that the cell will not span into the current row.
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/// A negative value means that the cell will span all remaining rows in the row group.
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///
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/// As each column in a row is processed, the values in this vector are updated for the
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/// next row.
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pub incoming_rowspans: Vec<isize>,
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}
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impl TableBuilder {
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pub(super) fn new(style: Arc<ComputedValues>) -> Self {
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Self {
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table: Table::new(style),
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incoming_rowspans: Vec::new(),
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}
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}
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pub fn new_for_tests() -> Self {
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Self::new(ComputedValues::initial_values().to_arc())
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}
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pub fn last_row_index_in_row_group_at_row_n(&self, n: usize) -> usize {
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// TODO: This is just a linear search, because the idea is that there are
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// generally less than or equal to three row groups, but if we notice a lot
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// of web content with more, we can consider a binary search here.
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for row_group in self.table.row_groups.iter() {
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if row_group.track_range.start > n {
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return row_group.track_range.start - 1;
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}
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}
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self.table.size.height - 1
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}
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pub fn finish(mut self) -> Table {
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self.do_missing_cells_fixup();
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self.remove_extra_columns_and_column_groups();
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self.reorder_first_thead_and_tfoot();
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self.do_final_rowspan_calculation();
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self.table
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}
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/// Do <https://drafts.csswg.org/css-tables/#missing-cells-fixup> which ensures
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/// that every row has the same number of cells.
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fn do_missing_cells_fixup(&mut self) {
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for row in self.table.slots.iter_mut() {
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row.resize_with(self.table.size.width, || TableSlot::Empty);
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}
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}
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/// It's possible to define more table columns via `<colgroup>` and `<col>` elements
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/// than actually exist in the table. In that case, remove these bogus columns
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/// to prevent using them later in layout.
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fn remove_extra_columns_and_column_groups(&mut self) {
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let number_of_actual_table_columns = self.table.size.width;
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self.table.columns.truncate(number_of_actual_table_columns);
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let mut remove_from = None;
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for (group_index, column_group) in self.table.column_groups.iter_mut().enumerate() {
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if column_group.track_range.start >= number_of_actual_table_columns {
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remove_from = Some(group_index);
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break;
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}
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column_group.track_range.end = column_group
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.track_range
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.end
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.min(number_of_actual_table_columns);
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}
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if let Some(remove_from) = remove_from {
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self.table.column_groups.truncate(remove_from);
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}
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}
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/// Reorder the first `<thead>` and `<tbody>` to be the first and last row groups respectively.
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/// This requires fixing up all row group indices.
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/// See <https://drafts.csswg.org/css-tables/#table-header-group> and
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/// <https://drafts.csswg.org/css-tables/#table-footer-group>.
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fn reorder_first_thead_and_tfoot(&mut self) {
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let mut thead_index = None;
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let mut tfoot_index = None;
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for (row_group_index, row_group) in self.table.row_groups.iter().enumerate() {
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if thead_index.is_none() && row_group.group_type == TableTrackGroupType::HeaderGroup {
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thead_index = Some(row_group_index);
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}
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if tfoot_index.is_none() && row_group.group_type == TableTrackGroupType::FooterGroup {
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tfoot_index = Some(row_group_index);
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}
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if thead_index.is_some() && tfoot_index.is_some() {
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break;
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}
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}
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if let Some(thead_index) = thead_index {
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self.move_row_group_to_front(thead_index)
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}
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if let Some(mut tfoot_index) = tfoot_index {
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// We may have moved a `<thead>` which means the original index we
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// we found for this this <tfoot>` also needs to be updated!
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if thead_index.unwrap_or(0) > tfoot_index {
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tfoot_index += 1;
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}
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self.move_row_group_to_end(tfoot_index)
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}
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}
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fn regenerate_track_ranges(&mut self) {
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// Now update all track group ranges.
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let mut current_row_group_index = None;
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for (row_index, row) in self.table.rows.iter().enumerate() {
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if current_row_group_index == row.group_index {
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continue;
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}
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// Finish any row group that is currently being processed.
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if let Some(current_group_index) = current_row_group_index {
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self.table.row_groups[current_group_index].track_range.end = row_index;
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}
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// Start processing this new row group and update its starting index.
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current_row_group_index = row.group_index;
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if let Some(current_group_index) = current_row_group_index {
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self.table.row_groups[current_group_index].track_range.start = row_index;
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}
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}
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// Finish the last row group.
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if let Some(current_group_index) = current_row_group_index {
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self.table.row_groups[current_group_index].track_range.end = self.table.rows.len();
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}
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}
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fn move_row_group_to_front(&mut self, index_to_move: usize) {
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if index_to_move == 0 {
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return;
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}
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// Move the slots associated with this group.
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let row_range = self.table.row_groups[index_to_move].track_range.clone();
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let removed_slots: Vec<Vec<TableSlot>> = self
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.table
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.slots
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.splice(row_range.clone(), std::iter::empty())
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.collect();
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self.table.slots.splice(0..0, removed_slots);
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// Move the rows associated with this group.
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let removed_rows: Vec<TableTrack> = self
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.table
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.rows
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.splice(row_range, std::iter::empty())
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.collect();
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self.table.rows.splice(0..0, removed_rows);
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// Move the group itself.
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let removed_row_group = self.table.row_groups.remove(index_to_move);
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self.table.row_groups.insert(0, removed_row_group);
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for row in self.table.rows.iter_mut() {
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match row.group_index.as_mut() {
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Some(group_index) if *group_index < index_to_move => *group_index += 1,
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Some(group_index) if *group_index == index_to_move => *group_index = 0,
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_ => {},
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}
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}
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// Do this now, rather than after possibly moving a `<tfoot>` row group to the end,
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// because moving row groups depends on an accurate `track_range` in every group.
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self.regenerate_track_ranges();
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}
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fn move_row_group_to_end(&mut self, index_to_move: usize) {
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let last_row_group_index = self.table.row_groups.len() - 1;
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if index_to_move == last_row_group_index {
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return;
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}
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// Move the slots associated with this group.
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let row_range = self.table.row_groups[index_to_move].track_range.clone();
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let removed_slots: Vec<Vec<TableSlot>> = self
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.table
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.slots
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.splice(row_range.clone(), std::iter::empty())
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.collect();
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self.table.slots.extend(removed_slots);
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// Move the rows associated with this group.
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let removed_rows: Vec<TableTrack> = self
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.table
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.rows
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.splice(row_range, std::iter::empty())
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.collect();
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self.table.rows.extend(removed_rows);
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// Move the group itself.
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let removed_row_group = self.table.row_groups.remove(index_to_move);
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self.table.row_groups.push(removed_row_group);
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for row in self.table.rows.iter_mut() {
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match row.group_index.as_mut() {
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Some(group_index) if *group_index > index_to_move => *group_index -= 1,
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Some(group_index) if *group_index == index_to_move => {
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*group_index = last_row_group_index
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},
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_ => {},
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}
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}
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self.regenerate_track_ranges();
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}
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/// Turn all rowspan=0 rows into the real value to avoid having to make the calculation
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/// continually during layout. In addition, make sure that there are no rowspans that extend
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/// past the end of their row group.
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fn do_final_rowspan_calculation(&mut self) {
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for row_index in 0..self.table.size.height {
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let last_row_index_in_group = self.last_row_index_in_row_group_at_row_n(row_index);
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for cell in self.table.slots[row_index].iter_mut() {
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if let TableSlot::Cell(ref mut cell) = cell {
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if cell.rowspan == 1 {
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continue;
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}
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let rowspan_to_end_of_group = last_row_index_in_group - row_index + 1;
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if cell.rowspan == 0 {
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cell.rowspan = rowspan_to_end_of_group;
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} else {
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cell.rowspan = cell.rowspan.min(rowspan_to_end_of_group);
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}
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}
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}
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}
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}
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fn current_y(&self) -> usize {
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self.table.slots.len() - 1
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}
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fn current_x(&self) -> usize {
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self.table.slots[self.current_y()].len()
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}
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fn current_coords(&self) -> TableSlotCoordinates {
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TableSlotCoordinates::new(self.current_x(), self.current_y())
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}
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pub fn start_row(&mut self) {
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self.table.slots.push(Vec::new());
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self.table.size.height += 1;
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self.create_slots_for_cells_above_with_rowspan(true);
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}
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pub fn end_row(&mut self) {
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// TODO: We need to insert a cell for any leftover non-table-like
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// content in the TableRowBuilder.
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|
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// Truncate entries that are zero at the end of [`Self::incoming_rowspans`]. This
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// prevents padding the table with empty cells when it isn't necessary.
|
|
let current_x = self.current_x();
|
|
for i in (current_x..self.incoming_rowspans.len()).rev() {
|
|
if self.incoming_rowspans[i] == 0 {
|
|
self.incoming_rowspans.pop();
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
self.create_slots_for_cells_above_with_rowspan(false);
|
|
}
|
|
|
|
/// When not in the process of filling a cell, make sure any incoming rowspans are
|
|
/// filled so that the next specified cell comes after them. Should have been called before
|
|
/// [`Self::handle_cell`].
|
|
///
|
|
/// if `stop_at_cell_opportunity` is set, this will stop at the first slot with
|
|
/// `incoming_rowspans` equal to zero. If not, it will insert [`TableSlot::Empty`] and
|
|
/// continue to look for more incoming rowspans (which should only be done once we're
|
|
/// finished processing the cells in a row, and after calling truncating cells with
|
|
/// remaining rowspan from the end of `incoming_rowspans`.
|
|
fn create_slots_for_cells_above_with_rowspan(&mut self, stop_at_cell_opportunity: bool) {
|
|
let mut current_x = self.current_x();
|
|
while let Some(span) = self.incoming_rowspans.get_mut(current_x) {
|
|
// This column has no incoming rowspanned cells and `stop_at_zero` is true, so
|
|
// we should stop to process new cells defined in the current row.
|
|
if *span == 0 && stop_at_cell_opportunity {
|
|
break;
|
|
}
|
|
|
|
let new_cell = if *span != 0 {
|
|
*span -= 1;
|
|
self.table
|
|
.create_spanned_slot_based_on_cell_above(self.current_coords())
|
|
.expect(
|
|
"Nonzero incoming rowspan cannot occur without a cell spanning this slot",
|
|
)
|
|
} else {
|
|
TableSlot::Empty
|
|
};
|
|
|
|
self.table.push_new_slot_to_last_row(new_cell);
|
|
current_x = self.current_x();
|
|
}
|
|
}
|
|
|
|
/// <https://html.spec.whatwg.org/multipage/#algorithm-for-processing-rows>
|
|
/// Push a single cell onto the slot map, handling any colspans it may have, and
|
|
/// setting up the outgoing rowspans.
|
|
pub fn add_cell(&mut self, cell: TableSlotCell) {
|
|
// Make sure the incoming_rowspans table is large enough
|
|
// because we will be writing to it.
|
|
let current_x = self.current_x();
|
|
let colspan = cell.colspan;
|
|
let rowspan = cell.rowspan;
|
|
|
|
if self.incoming_rowspans.len() < current_x + colspan {
|
|
self.incoming_rowspans.resize(current_x + colspan, 0isize);
|
|
}
|
|
|
|
debug_assert_eq!(
|
|
self.incoming_rowspans[current_x], 0,
|
|
"Added a cell in a position that also had an incoming rowspan!"
|
|
);
|
|
|
|
// If `rowspan` is zero, this is automatically negative and will stay negative.
|
|
let outgoing_rowspan = rowspan as isize - 1;
|
|
self.table.push_new_slot_to_last_row(TableSlot::Cell(cell));
|
|
self.incoming_rowspans[current_x] = outgoing_rowspan;
|
|
|
|
// Draw colspanned cells
|
|
for colspan_offset in 1..colspan {
|
|
let current_x_plus_colspan_offset = current_x + colspan_offset;
|
|
let new_offset = TableSlotOffset::new(colspan_offset, 0);
|
|
let incoming_rowspan = &mut self.incoming_rowspans[current_x_plus_colspan_offset];
|
|
let new_slot = if *incoming_rowspan == 0 {
|
|
*incoming_rowspan = outgoing_rowspan;
|
|
TableSlot::new_spanned(new_offset)
|
|
} else {
|
|
// This means we have a table model error.
|
|
|
|
// if `incoming_rowspan` is greater than zero, a cell from above is spanning
|
|
// into our row, colliding with the cells we are creating via colspan. In
|
|
// that case, set the incoming rowspan to the highest of two possible
|
|
// outgoing rowspan values (the incoming rowspan minus one, OR this cell's
|
|
// outgoing rowspan). `spanned_slot()`` will handle filtering out
|
|
// inapplicable spans when it needs to.
|
|
//
|
|
// If the `incoming_rowspan` is negative we are in `rowspan=0` mode, (i.e.
|
|
// rowspan=infinity), so we don't have to worry about the current cell
|
|
// making it larger. In that case, don't change the rowspan.
|
|
if *incoming_rowspan > 0 {
|
|
*incoming_rowspan = std::cmp::max(*incoming_rowspan - 1, outgoing_rowspan);
|
|
}
|
|
|
|
// This code creates a new slot in the case that there is a table model error.
|
|
let coords_of_spanned_cell =
|
|
TableSlotCoordinates::new(current_x_plus_colspan_offset, self.current_y());
|
|
match self
|
|
.table
|
|
.create_spanned_slot_based_on_cell_above(coords_of_spanned_cell)
|
|
{
|
|
Some(mut incoming_slot) => {
|
|
incoming_slot.push_spanned(new_offset);
|
|
incoming_slot
|
|
},
|
|
None => TableSlot::new_spanned(new_offset),
|
|
}
|
|
};
|
|
self.table.push_new_slot_to_last_row(new_slot);
|
|
}
|
|
|
|
debug_assert_eq!(
|
|
current_x + colspan,
|
|
self.current_x(),
|
|
"Must have produced `colspan` slot entries!"
|
|
);
|
|
self.create_slots_for_cells_above_with_rowspan(true);
|
|
}
|
|
}
|
|
|
|
pub(crate) struct TableBuilderTraversal<'style, 'dom, Node> {
|
|
context: &'style LayoutContext<'style>,
|
|
info: &'style NodeAndStyleInfo<Node>,
|
|
|
|
/// The value of the [`TextDecorationLine`] to use, either for the row group
|
|
/// if processing one or for the table itself if outside a row group.
|
|
current_text_decoration_line: TextDecorationLine,
|
|
|
|
/// The [`TableBuilder`] for this [`TableBuilderTraversal`]. This is separated
|
|
/// into another struct so that we can write unit tests against the builder.
|
|
builder: TableBuilder,
|
|
|
|
current_anonymous_row_content: Vec<AnonymousTableContent<'dom, Node>>,
|
|
|
|
/// The index of the current row group, if there is one.
|
|
current_row_group_index: Option<usize>,
|
|
}
|
|
|
|
impl<'style, 'dom, Node> TableBuilderTraversal<'style, 'dom, Node>
|
|
where
|
|
Node: NodeExt<'dom>,
|
|
{
|
|
pub(crate) fn new(
|
|
context: &'style LayoutContext<'style>,
|
|
info: &'style NodeAndStyleInfo<Node>,
|
|
text_decoration_line: TextDecorationLine,
|
|
) -> Self {
|
|
TableBuilderTraversal {
|
|
context,
|
|
info,
|
|
current_text_decoration_line: text_decoration_line,
|
|
builder: TableBuilder::new(info.style.clone()),
|
|
current_anonymous_row_content: Vec::new(),
|
|
current_row_group_index: None,
|
|
}
|
|
}
|
|
|
|
pub(crate) fn finish(mut self) -> Table {
|
|
self.finish_anonymous_row_if_needed();
|
|
self.builder.finish()
|
|
}
|
|
|
|
fn finish_anonymous_row_if_needed(&mut self) {
|
|
if self.current_anonymous_row_content.is_empty() {
|
|
return;
|
|
}
|
|
|
|
let row_content = std::mem::take(&mut self.current_anonymous_row_content);
|
|
let context = self.context;
|
|
let anonymous_style = self
|
|
.context
|
|
.shared_context()
|
|
.stylist
|
|
.style_for_anonymous::<Node::ConcreteElement>(
|
|
&context.shared_context().guards,
|
|
&PseudoElement::ServoAnonymousTableCell,
|
|
&self.info.style,
|
|
);
|
|
let anonymous_info = self.info.new_anonymous(anonymous_style);
|
|
let mut row_builder =
|
|
TableRowBuilder::new(self, &anonymous_info, self.current_text_decoration_line);
|
|
|
|
for cell_content in row_content {
|
|
match cell_content {
|
|
AnonymousTableContent::Element {
|
|
info,
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
} => {
|
|
row_builder.handle_element(&info, display, contents, box_slot);
|
|
},
|
|
AnonymousTableContent::Text(info, text) => {
|
|
row_builder.handle_text(&info, text);
|
|
},
|
|
}
|
|
}
|
|
|
|
row_builder.finish();
|
|
}
|
|
}
|
|
|
|
impl<'style, 'dom, Node: 'dom> TraversalHandler<'dom, Node>
|
|
for TableBuilderTraversal<'style, 'dom, Node>
|
|
where
|
|
Node: NodeExt<'dom>,
|
|
{
|
|
fn handle_text(&mut self, info: &NodeAndStyleInfo<Node>, text: Cow<'dom, str>) {
|
|
if text.chars().all(char_is_whitespace) {
|
|
return;
|
|
}
|
|
self.current_anonymous_row_content
|
|
.push(AnonymousTableContent::Text(info.clone(), text));
|
|
}
|
|
|
|
/// <https://html.spec.whatwg.org/multipage/#forming-a-table>
|
|
fn handle_element(
|
|
&mut self,
|
|
info: &NodeAndStyleInfo<Node>,
|
|
display: DisplayGeneratingBox,
|
|
contents: Contents,
|
|
box_slot: BoxSlot<'dom>,
|
|
) {
|
|
match display {
|
|
DisplayGeneratingBox::LayoutInternal(internal) => match internal {
|
|
DisplayLayoutInternal::TableRowGroup |
|
|
DisplayLayoutInternal::TableFooterGroup |
|
|
DisplayLayoutInternal::TableHeaderGroup => {
|
|
self.finish_anonymous_row_if_needed();
|
|
self.builder.incoming_rowspans.clear();
|
|
|
|
let next_row_index = self.builder.table.rows.len();
|
|
self.builder.table.row_groups.push(TableTrackGroup {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_type: internal.into(),
|
|
track_range: next_row_index..next_row_index,
|
|
});
|
|
|
|
let previous_text_decoration_line = self.current_text_decoration_line;
|
|
self.current_text_decoration_line =
|
|
self.current_text_decoration_line | info.style.clone_text_decoration_line();
|
|
|
|
let new_row_group_index = self.builder.table.row_groups.len() - 1;
|
|
self.current_row_group_index = Some(new_row_group_index);
|
|
|
|
NonReplacedContents::try_from(contents).unwrap().traverse(
|
|
self.context,
|
|
info,
|
|
self,
|
|
);
|
|
|
|
self.current_row_group_index = None;
|
|
self.current_text_decoration_line = previous_text_decoration_line;
|
|
self.builder.incoming_rowspans.clear();
|
|
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot)
|
|
},
|
|
DisplayLayoutInternal::TableRow => {
|
|
self.finish_anonymous_row_if_needed();
|
|
|
|
let context = self.context;
|
|
|
|
let mut row_builder =
|
|
TableRowBuilder::new(self, info, self.current_text_decoration_line);
|
|
NonReplacedContents::try_from(contents).unwrap().traverse(
|
|
context,
|
|
info,
|
|
&mut row_builder,
|
|
);
|
|
row_builder.finish();
|
|
|
|
self.builder.table.rows.push(TableTrack {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_index: self.current_row_group_index,
|
|
is_anonymous: false,
|
|
});
|
|
|
|
let last_row = self.builder.table.rows.len();
|
|
let row_group = self
|
|
.current_row_group_index
|
|
.map(|index| &mut self.builder.table.row_groups[index]);
|
|
if let Some(row_group) = row_group {
|
|
row_group.track_range.end = last_row;
|
|
}
|
|
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot)
|
|
},
|
|
DisplayLayoutInternal::TableColumn => {
|
|
let span = info
|
|
.node
|
|
.and_then(|node| node.to_threadsafe().get_span())
|
|
.unwrap_or(1)
|
|
.min(1000);
|
|
|
|
for _ in 0..span + 1 {
|
|
self.builder.table.columns.push(TableTrack {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_index: None,
|
|
is_anonymous: false,
|
|
})
|
|
}
|
|
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot)
|
|
},
|
|
DisplayLayoutInternal::TableColumnGroup => {
|
|
let column_group_index = self.builder.table.column_groups.len();
|
|
let mut column_group_builder = TableColumnGroupBuilder {
|
|
column_group_index,
|
|
columns: Vec::new(),
|
|
};
|
|
|
|
NonReplacedContents::try_from(contents).unwrap().traverse(
|
|
self.context,
|
|
info,
|
|
&mut column_group_builder,
|
|
);
|
|
|
|
let first_column = self.builder.table.columns.len();
|
|
if column_group_builder.columns.is_empty() {
|
|
let span = info
|
|
.node
|
|
.and_then(|node| node.to_threadsafe().get_span())
|
|
.unwrap_or(1)
|
|
.min(1000) as usize;
|
|
|
|
self.builder.table.columns.extend(
|
|
repeat(TableTrack {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_index: Some(column_group_index),
|
|
is_anonymous: true,
|
|
})
|
|
.take(span),
|
|
);
|
|
} else {
|
|
self.builder
|
|
.table
|
|
.columns
|
|
.extend(column_group_builder.columns);
|
|
}
|
|
|
|
self.builder.table.column_groups.push(TableTrackGroup {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_type: internal.into(),
|
|
track_range: first_column..self.builder.table.columns.len(),
|
|
});
|
|
|
|
::std::mem::forget(box_slot);
|
|
},
|
|
DisplayLayoutInternal::TableCaption => {
|
|
// TODO: Handle table captions.
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot);
|
|
},
|
|
DisplayLayoutInternal::TableCell => {
|
|
self.current_anonymous_row_content
|
|
.push(AnonymousTableContent::Element {
|
|
info: info.clone(),
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
});
|
|
},
|
|
},
|
|
_ => {
|
|
self.current_anonymous_row_content
|
|
.push(AnonymousTableContent::Element {
|
|
info: info.clone(),
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
});
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
struct TableRowBuilder<'style, 'builder, 'dom, 'a, Node> {
|
|
table_traversal: &'builder mut TableBuilderTraversal<'style, 'dom, Node>,
|
|
|
|
/// The [`NodeAndStyleInfo`] of this table row, which we use to
|
|
/// construct anonymous table cells.
|
|
info: &'a NodeAndStyleInfo<Node>,
|
|
|
|
current_anonymous_cell_content: Vec<AnonymousTableContent<'dom, Node>>,
|
|
|
|
/// The [`TextDecorationLine`] to use for all children of this row.
|
|
text_decoration_line: TextDecorationLine,
|
|
}
|
|
|
|
impl<'style, 'builder, 'dom, 'a, Node: 'dom> TableRowBuilder<'style, 'builder, 'dom, 'a, Node>
|
|
where
|
|
Node: NodeExt<'dom>,
|
|
{
|
|
fn new(
|
|
table_traversal: &'builder mut TableBuilderTraversal<'style, 'dom, Node>,
|
|
info: &'a NodeAndStyleInfo<Node>,
|
|
propagated_text_decoration_line: TextDecorationLine,
|
|
) -> Self {
|
|
table_traversal.builder.start_row();
|
|
|
|
let text_decoration_line =
|
|
propagated_text_decoration_line | info.style.clone_text_decoration_line();
|
|
TableRowBuilder {
|
|
table_traversal,
|
|
info,
|
|
current_anonymous_cell_content: Vec::new(),
|
|
text_decoration_line,
|
|
}
|
|
}
|
|
|
|
fn finish(mut self) {
|
|
self.finish_current_anonymous_cell_if_needed();
|
|
self.table_traversal.builder.end_row();
|
|
}
|
|
|
|
fn finish_current_anonymous_cell_if_needed(&mut self) {
|
|
if self.current_anonymous_cell_content.is_empty() {
|
|
return;
|
|
}
|
|
|
|
let context = self.table_traversal.context;
|
|
let anonymous_style = context
|
|
.shared_context()
|
|
.stylist
|
|
.style_for_anonymous::<Node::ConcreteElement>(
|
|
&context.shared_context().guards,
|
|
&PseudoElement::ServoAnonymousTableCell,
|
|
&self.info.style,
|
|
);
|
|
let anonymous_info = self.info.new_anonymous(anonymous_style);
|
|
let mut builder =
|
|
BlockContainerBuilder::new(context, &anonymous_info, self.text_decoration_line);
|
|
|
|
for cell_content in self.current_anonymous_cell_content.drain(..) {
|
|
match cell_content {
|
|
AnonymousTableContent::Element {
|
|
info,
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
} => {
|
|
builder.handle_element(&info, display, contents, box_slot);
|
|
},
|
|
AnonymousTableContent::Text(info, text) => {
|
|
builder.handle_text(&info, text);
|
|
},
|
|
}
|
|
}
|
|
|
|
let block_container = builder.finish();
|
|
self.table_traversal.builder.add_cell(TableSlotCell {
|
|
contents: BlockFormattingContext::from_block_container(block_container),
|
|
colspan: 1,
|
|
rowspan: 1,
|
|
style: anonymous_info.style,
|
|
base_fragment_info: BaseFragmentInfo::anonymous(),
|
|
});
|
|
}
|
|
}
|
|
|
|
impl<'style, 'builder, 'dom, 'a, Node: 'dom> TraversalHandler<'dom, Node>
|
|
for TableRowBuilder<'style, 'builder, 'dom, 'a, Node>
|
|
where
|
|
Node: NodeExt<'dom>,
|
|
{
|
|
fn handle_text(&mut self, info: &NodeAndStyleInfo<Node>, text: Cow<'dom, str>) {
|
|
if text.chars().all(char_is_whitespace) {
|
|
return;
|
|
}
|
|
self.current_anonymous_cell_content
|
|
.push(AnonymousTableContent::Text(info.clone(), text));
|
|
}
|
|
|
|
/// <https://html.spec.whatwg.org/multipage/#algorithm-for-processing-rows>
|
|
fn handle_element(
|
|
&mut self,
|
|
info: &NodeAndStyleInfo<Node>,
|
|
display: DisplayGeneratingBox,
|
|
contents: Contents,
|
|
box_slot: BoxSlot<'dom>,
|
|
) {
|
|
match display {
|
|
DisplayGeneratingBox::LayoutInternal(internal) => match internal {
|
|
DisplayLayoutInternal::TableCell => {
|
|
// This value will already have filtered out rowspan=0
|
|
// in quirks mode, so we don't have to worry about that.
|
|
//
|
|
// The HTML specification limits the parsed value of `rowspan` to
|
|
// 65534 and `colspan` to 1000, so we also enforce the same limits
|
|
// when dealing with arbitrary DOM elements (perhaps created via
|
|
// script).
|
|
let (rowspan, colspan) = info.node.map_or((1, 1), |node| {
|
|
let node = node.to_threadsafe();
|
|
let rowspan = node.get_rowspan().unwrap_or(1).min(65534) as usize;
|
|
let colspan = node.get_colspan().unwrap_or(1).min(1000) as usize;
|
|
(rowspan, colspan)
|
|
});
|
|
|
|
let contents = match contents.try_into() {
|
|
Ok(non_replaced_contents) => {
|
|
BlockFormattingContext::construct(
|
|
self.table_traversal.context,
|
|
info,
|
|
non_replaced_contents,
|
|
self.text_decoration_line,
|
|
false, /* is_list_item */
|
|
)
|
|
},
|
|
Err(_replaced) => {
|
|
unreachable!("Replaced should not have a LayoutInternal display type.");
|
|
},
|
|
};
|
|
|
|
self.finish_current_anonymous_cell_if_needed();
|
|
self.table_traversal.builder.add_cell(TableSlotCell {
|
|
contents,
|
|
colspan,
|
|
rowspan,
|
|
style: info.style.clone(),
|
|
base_fragment_info: info.into(),
|
|
});
|
|
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot)
|
|
},
|
|
_ => {
|
|
//// TODO: Properly handle other table-like elements in the middle of a row.
|
|
self.current_anonymous_cell_content
|
|
.push(AnonymousTableContent::Element {
|
|
info: info.clone(),
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
});
|
|
},
|
|
},
|
|
_ => {
|
|
self.current_anonymous_cell_content
|
|
.push(AnonymousTableContent::Element {
|
|
info: info.clone(),
|
|
display,
|
|
contents,
|
|
box_slot,
|
|
});
|
|
},
|
|
}
|
|
}
|
|
}
|
|
|
|
struct TableColumnGroupBuilder {
|
|
column_group_index: usize,
|
|
columns: Vec<TableTrack>,
|
|
}
|
|
|
|
impl<'dom, Node: 'dom> TraversalHandler<'dom, Node> for TableColumnGroupBuilder
|
|
where
|
|
Node: NodeExt<'dom>,
|
|
{
|
|
fn handle_text(&mut self, _info: &NodeAndStyleInfo<Node>, _text: Cow<'dom, str>) {}
|
|
fn handle_element(
|
|
&mut self,
|
|
info: &NodeAndStyleInfo<Node>,
|
|
display: DisplayGeneratingBox,
|
|
_contents: Contents,
|
|
box_slot: BoxSlot<'dom>,
|
|
) {
|
|
// We are doing this until we have actually set a Box for this `BoxSlot`.
|
|
::std::mem::forget(box_slot);
|
|
|
|
if !matches!(
|
|
display,
|
|
DisplayGeneratingBox::LayoutInternal(DisplayLayoutInternal::TableColumn)
|
|
) {
|
|
return;
|
|
}
|
|
self.columns.push(TableTrack {
|
|
base_fragment_info: info.into(),
|
|
style: info.style.clone(),
|
|
group_index: Some(self.column_group_index),
|
|
is_anonymous: false,
|
|
});
|
|
}
|
|
}
|
|
|
|
impl From<DisplayLayoutInternal> for TableTrackGroupType {
|
|
fn from(value: DisplayLayoutInternal) -> Self {
|
|
match value {
|
|
DisplayLayoutInternal::TableColumnGroup => TableTrackGroupType::ColumnGroup,
|
|
DisplayLayoutInternal::TableFooterGroup => TableTrackGroupType::FooterGroup,
|
|
DisplayLayoutInternal::TableHeaderGroup => TableTrackGroupType::HeaderGroup,
|
|
DisplayLayoutInternal::TableRowGroup => TableTrackGroupType::RowGroup,
|
|
_ => unreachable!(),
|
|
}
|
|
}
|
|
}
|