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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 https://mozilla.org/MPL/2.0/. */
#![allow(dead_code)]
#![allow(unreachable_code)]
#![allow(unused_imports)]
#![allow(unused_variables)]
#![deny(unsafe_code)]
#[macro_use]
extern crate serde;
use style::properties::ComputedValues;
use style::values::computed::{Length, LengthOrAuto};
use style::Zero;
pub mod context;
pub mod data;
pub mod dom_traversal;
pub mod element_data;
pub mod flow;
pub mod fragments;
pub mod geom;
pub mod opaque_node;
pub mod positioned;
pub mod query;
pub mod replaced;
pub mod style_ext;
pub mod traversal;
pub mod wrapper;
use crate::dom_traversal::{Contents, NodeExt};
use crate::flow::{BlockFormattingContext, FlowChildren};
use crate::geom::flow_relative::Vec2;
use crate::positioned::AbsolutelyPositionedFragment;
use crate::replaced::ReplacedContent;
use crate::style_ext::{ComputedValuesExt, Direction, Position, WritingMode};
use servo_arc::Arc;
use std::convert::TryInto;
use style::context::SharedStyleContext;
use style::values::specified::box_::DisplayInside;
/// https://drafts.csswg.org/css-display/#independent-formatting-context
#[derive(Debug)]
enum IndependentFormattingContext {
Flow(BlockFormattingContext),
// Not called FC in specs, but behaves close enough
Replaced(ReplacedContent),
// Other layout modes go here
}
enum NonReplacedIFC<'a> {
Flow(&'a BlockFormattingContext),
}
impl IndependentFormattingContext {
fn construct<'dom, 'style>(
context: &SharedStyleContext<'style>,
style: &Arc<ComputedValues>,
display_inside: DisplayInside,
contents: Contents<impl NodeExt<'dom>>,
) -> Self {
match contents.try_into() {
Ok(non_replaced) => match display_inside {
DisplayInside::Flow | DisplayInside::FlowRoot => {
IndependentFormattingContext::Flow(BlockFormattingContext::construct(
context,
style,
non_replaced,
))
},
DisplayInside::None | DisplayInside::Contents => panic!(":("),
},
Err(replaced) => IndependentFormattingContext::Replaced(replaced),
}
}
fn as_replaced(&self) -> Result<&ReplacedContent, NonReplacedIFC> {
match self {
IndependentFormattingContext::Replaced(r) => Ok(r),
IndependentFormattingContext::Flow(f) => Err(NonReplacedIFC::Flow(f)),
}
}
fn layout<'a>(
&'a self,
containing_block: &ContainingBlock,
tree_rank: usize,
absolutely_positioned_fragments: &mut Vec<AbsolutelyPositionedFragment<'a>>,
) -> FlowChildren {
match self.as_replaced() {
Ok(replaced) => match *replaced {},
Err(ifc) => ifc.layout(containing_block, tree_rank, absolutely_positioned_fragments),
}
}
}
impl<'a> NonReplacedIFC<'a> {
fn layout(
&self,
containing_block: &ContainingBlock,
tree_rank: usize,
absolutely_positioned_fragments: &mut Vec<AbsolutelyPositionedFragment<'a>>,
) -> FlowChildren {
match self {
NonReplacedIFC::Flow(bfc) => {
bfc.layout(containing_block, tree_rank, absolutely_positioned_fragments)
},
}
}
}
struct ContainingBlock {
inline_size: Length,
block_size: LengthOrAuto,
mode: (WritingMode, Direction),
}
struct DefiniteContainingBlock {
size: Vec2<Length>,
mode: (WritingMode, Direction),
}
/// https://drafts.csswg.org/css2/visuren.html#relative-positioning
fn relative_adjustement(
style: &ComputedValues,
inline_size: Length,
block_size: LengthOrAuto,
) -> Vec2<Length> {
if style.get_box().position != Position::Relative {
return Vec2::zero();
}
fn adjust(start: LengthOrAuto, end: LengthOrAuto) -> Length {
match (start, end) {
(LengthOrAuto::Auto, LengthOrAuto::Auto) => Length::zero(),
(LengthOrAuto::Auto, LengthOrAuto::LengthPercentage(end)) => -end,
(LengthOrAuto::LengthPercentage(start), _) => start,
}
}
let block_size = block_size.auto_is(Length::zero);
let box_offsets = style.box_offsets().map_inline_and_block_axes(
|v| v.percentage_relative_to(inline_size),
|v| v.percentage_relative_to(block_size),
);
Vec2 {
inline: adjust(box_offsets.inline_start, box_offsets.inline_end),
block: adjust(box_offsets.block_start, box_offsets.block_end),
}
}
// FIXME: use std::mem::take when it’s stable.
// https://github.com/rust-lang/rust/issues/61129
fn take<T>(x: &mut T) -> T
where
T: Default,
{
std::mem::replace(x, Default::default())
}
|
