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/* 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 http://mozilla.org/MPL/2.0/. */
use layout::box::Box;
use layout::construct::{ConstructionResult, NoConstructionResult};
use extra::arc::Arc;
use script::dom::node::{AbstractNode, LayoutView};
use servo_util::range::Range;
use servo_util::slot::{MutSlotRef, SlotRef};
use servo_util::tree::TreeNodeRef;
use std::cast;
use std::iter::Enumerate;
use std::vec::VecIterator;
use style::{ComputedValues, PropertyDeclaration};
/// A range of nodes.
pub struct NodeRange {
node: AbstractNode<LayoutView>,
range: Range,
}
impl NodeRange {
pub fn new(node: AbstractNode<LayoutView>, range: &Range) -> NodeRange {
NodeRange {
node: node,
range: (*range).clone()
}
}
}
struct ElementMapping {
priv entries: ~[NodeRange],
}
impl ElementMapping {
pub fn new() -> ElementMapping {
ElementMapping { entries: ~[] }
}
pub fn add_mapping(&mut self, node: AbstractNode<LayoutView>, range: &Range) {
self.entries.push(NodeRange::new(node, range))
}
pub fn each(&self, callback: &fn(nr: &NodeRange) -> bool) -> bool {
for nr in self.entries.iter() {
if !callback(nr) {
break
}
}
true
}
pub fn eachi<'a>(&'a self) -> Enumerate<VecIterator<'a, NodeRange>> {
self.entries.iter().enumerate()
}
pub fn repair_for_box_changes(&mut self, old_boxes: &[Box], new_boxes: &[Box]) {
let entries = &mut self.entries;
debug!("--- Old boxes: ---");
for (i, box) in old_boxes.iter().enumerate() {
debug!("{:u} --> {:s}", i, box.debug_str());
}
debug!("------------------");
debug!("--- New boxes: ---");
for (i, box) in new_boxes.iter().enumerate() {
debug!("{:u} --> {:s}", i, box.debug_str());
}
debug!("------------------");
debug!("--- Elem ranges before repair: ---");
for (i, nr) in entries.iter().enumerate() {
debug!("{:u}: {} --> {:s}", i, nr.range, nr.node.debug_str());
}
debug!("----------------------------------");
let mut old_i = 0;
let mut new_j = 0;
struct WorkItem {
begin_idx: uint,
entry_idx: uint,
};
let mut repair_stack : ~[WorkItem] = ~[];
// index into entries
let mut entries_k = 0;
while old_i < old_boxes.len() {
debug!("repair_for_box_changes: Considering old box {:u}", old_i);
// possibly push several items
while entries_k < entries.len() && old_i == entries[entries_k].range.begin() {
let item = WorkItem {begin_idx: new_j, entry_idx: entries_k};
debug!("repair_for_box_changes: Push work item for elem {:u}: {:?}", entries_k, item);
repair_stack.push(item);
entries_k += 1;
}
while new_j < new_boxes.len() && old_boxes[old_i].node != new_boxes[new_j].node {
debug!("repair_for_box_changes: Slide through new box {:u}", new_j);
new_j += 1;
}
old_i += 1;
// possibly pop several items
while repair_stack.len() > 0 && old_i == entries[repair_stack.last().entry_idx].range.end() {
let item = repair_stack.pop();
debug!("repair_for_box_changes: Set range for {:u} to {}",
item.entry_idx, Range::new(item.begin_idx, new_j - item.begin_idx));
entries[item.entry_idx].range = Range::new(item.begin_idx, new_j - item.begin_idx);
}
}
debug!("--- Elem ranges after repair: ---");
for (i, nr) in entries.iter().enumerate() {
debug!("{:u}: {} --> {:s}", i, nr.range, nr.node.debug_str());
}
debug!("----------------------------------");
}
}
/// Data that layout associates with a node.
pub struct LayoutData {
/// The results of CSS matching for this node.
applicable_declarations: ~[Arc<~[PropertyDeclaration]>],
/// The results of CSS styling for this node.
style: Option<ComputedValues>,
/// Description of how to account for recent style changes.
restyle_damage: Option<int>,
/// The current results of flow construction for this node. This is either a flow or a
/// `ConstructionItem`. See comments in `construct.rs` for more details.
flow_construction_result: ConstructionResult,
}
impl LayoutData {
/// Creates new layout data.
pub fn new() -> LayoutData {
LayoutData {
applicable_declarations: ~[],
style: None,
restyle_damage: None,
flow_construction_result: NoConstructionResult,
}
}
}
/// A trait that allows access to the layout data of a DOM node.
pub trait LayoutDataAccess {
/// Borrows the layout data without checks.
///
/// FIXME(pcwalton): Make safe.
unsafe fn borrow_layout_data_unchecked<'a>(&'a self) -> &'a Option<~LayoutData>;
/// Borrows the layout data immutably. Fails on a conflicting borrow.
fn borrow_layout_data<'a>(&'a self) -> SlotRef<'a,Option<~LayoutData>>;
/// Borrows the layout data mutably. Fails on a conflicting borrow.
fn mutate_layout_data<'a>(&'a self) -> MutSlotRef<'a,Option<~LayoutData>>;
}
impl LayoutDataAccess for AbstractNode<LayoutView> {
#[inline(always)]
unsafe fn borrow_layout_data_unchecked<'a>(&'a self) -> &'a Option<~LayoutData> {
cast::transmute(self.node().layout_data.borrow_unchecked())
}
#[inline(always)]
fn borrow_layout_data<'a>(&'a self) -> SlotRef<'a,Option<~LayoutData>> {
unsafe {
cast::transmute(self.node().layout_data.borrow())
}
}
#[inline(always)]
fn mutate_layout_data<'a>(&'a self) -> MutSlotRef<'a,Option<~LayoutData>> {
unsafe {
cast::transmute(self.node().layout_data.mutate())
}
}
}
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