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Use associated types instead of wrapper types.

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Bobby Holley 2015-11-18 19:51:11 -08:00
parent 516619b230
commit 05db7b3652
1 changed files with 71 additions and 61 deletions
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132
components/layout/wrapper.rs
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@ -74,14 +74,10 @@ use util::str::{is_whitespace, search_index};
/// A wrapper so that layout can access only the methods that it should have access to. Layout must
/// only ever see these and must never see instances of `LayoutJS`.
pub trait WrapperTypes<'a> : Sized {
type Node: LayoutNode<'a, Self>;
type Document: LayoutDocument<'a, Self>;
type Element: LayoutElement<'a, Self>;
}
pub trait LayoutNode<'ln> : Sized + Copy + Clone {
type ConcreteLayoutElement: LayoutElement<'ln>;
type ConcreteLayoutDocument: LayoutDocument<'ln>;
pub trait LayoutNode<'ln, Wrappers> : Sized + Copy + Clone
where Wrappers: WrapperTypes<'ln> {
/// Returns the type ID of this node.
fn type_id(&self) -> NodeTypeId;
@ -89,12 +85,12 @@ pub trait LayoutNode<'ln, Wrappers> : Sized + Copy + Clone
fn dump(self);
fn traverse_preorder(self) -> LayoutTreeIterator<'ln, Wrappers>;
fn traverse_preorder(self) -> LayoutTreeIterator<'ln, Self>;
/// Returns an iterator over this node's children.
fn children(self) -> LayoutNodeChildrenIterator<'ln, Wrappers>;
fn children(self) -> LayoutNodeChildrenIterator<'ln, Self>;
fn rev_children(self) -> LayoutNodeReverseChildrenIterator<'ln, Wrappers>;
fn rev_children(self) -> LayoutNodeReverseChildrenIterator<'ln, Self>;
/// Converts self into an `OpaqueNode`.
fn opaque(&self) -> OpaqueNode;
@ -110,9 +106,9 @@ pub trait LayoutNode<'ln, Wrappers> : Sized + Copy + Clone
fn debug_id(self) -> usize;
fn as_element(&self) -> Option<Wrappers::Element>;
fn as_element(&self) -> Option<Self::ConcreteLayoutElement>;
fn as_document(&self) -> Option<Wrappers::Document>;
fn as_document(&self) -> Option<Self::ConcreteLayoutDocument>;
fn children_count(&self) -> u32;
@ -154,29 +150,33 @@ pub trait LayoutNode<'ln, Wrappers> : Sized + Copy + Clone
#[inline(always)]
fn mutate_layout_data(&self) -> RefMut<Option<LayoutDataWrapper>>;
fn parent_node(&self) -> Option<Wrappers::Node>;
fn parent_node(&self) -> Option<Self>;
fn first_child(&self) -> Option<Wrappers::Node>;
fn first_child(&self) -> Option<Self>;
fn last_child(&self) -> Option<Wrappers::Node>;
fn last_child(&self) -> Option<Self>;
fn prev_sibling(&self) -> Option<Wrappers::Node>;
fn prev_sibling(&self) -> Option<Self>;
fn next_sibling(&self) -> Option<Wrappers::Node>;
fn next_sibling(&self) -> Option<Self>;
}
pub trait LayoutDocument<'ld, Wrappers> : Sized + Copy + Clone
where Wrappers: WrapperTypes<'ld> {
fn as_node(&self) -> Wrappers::Node;
pub trait LayoutDocument<'ld> : Sized + Copy + Clone {
type ConcreteLayoutNode: LayoutNode<'ld>;
type ConcreteLayoutElement: LayoutElement<'ld>;
fn root_node(&self) -> Option<Wrappers::Node>;
fn as_node(&self) -> Self::ConcreteLayoutNode;
fn drain_modified_elements(&self) -> Vec<(Wrappers::Element, ElementSnapshot)>;
fn root_node(&self) -> Option<Self::ConcreteLayoutNode>;
fn drain_modified_elements(&self) -> Vec<(Self::ConcreteLayoutElement, ElementSnapshot)>;
}
pub trait LayoutElement<'le, Wrappers> : Sized + Copy + Clone + ::selectors::Element + TElementAttributes
where Wrappers: WrapperTypes<'le> {
fn as_node(&self) -> Wrappers::Node;
pub trait LayoutElement<'le> : Sized + Copy + Clone + ::selectors::Element + TElementAttributes {
type ConcreteLayoutNode: LayoutNode<'le>;
type ConcreteLayoutDocument: LayoutDocument<'le>;
fn as_node(&self) -> Self::ConcreteLayoutNode;
fn style_attribute(&self) -> &'le Option<PropertyDeclarationBlock>;
@ -224,17 +224,6 @@ pub trait LayoutElement<'le, Wrappers> : Sized + Copy + Clone + ::selectors::Ele
}
}
pub struct ServoWrapperTypes<'a> {
// Satisfy the compiler about the unused lifetime.
phantom: PhantomData<&'a ()>,
}
impl<'a> WrapperTypes<'a> for ServoWrapperTypes<'a> {
type Node = ServoLayoutNode<'a>;
type Element = ServoLayoutElement<'a>;
type Document = ServoLayoutDocument<'a>;
}
#[derive(Copy, Clone)]
pub struct ServoLayoutNode<'a> {
/// The wrapped node.
@ -272,7 +261,10 @@ impl<'ln> ServoLayoutNode<'ln> {
}
}
impl<'ln> LayoutNode<'ln, ServoWrapperTypes<'ln>> for ServoLayoutNode<'ln> {
impl<'ln> LayoutNode<'ln> for ServoLayoutNode<'ln> {
type ConcreteLayoutElement = ServoLayoutElement<'ln>;
type ConcreteLayoutDocument = ServoLayoutDocument<'ln>;
fn type_id(&self) -> NodeTypeId {
unsafe {
self.node.type_id_for_layout()
@ -289,19 +281,21 @@ impl<'ln> LayoutNode<'ln, ServoWrapperTypes<'ln>> for ServoLayoutNode<'ln> {
self.dump_indent(0);
}
fn traverse_preorder(self) -> LayoutTreeIterator<'ln, ServoWrapperTypes<'ln>> {
fn traverse_preorder(self) -> LayoutTreeIterator<'ln, Self> {
LayoutTreeIterator::new(self)
}
fn children(self) -> LayoutNodeChildrenIterator<'ln, ServoWrapperTypes<'ln>> {
fn children(self) -> LayoutNodeChildrenIterator<'ln, Self> {
LayoutNodeChildrenIterator {
current: self.first_child(),
phantom: PhantomData,
}
}
fn rev_children(self) -> LayoutNodeReverseChildrenIterator<'ln, ServoWrapperTypes<'ln>> {
fn rev_children(self) -> LayoutNodeReverseChildrenIterator<'ln, Self> {
LayoutNodeReverseChildrenIterator {
current: self.last_child()
current: self.last_child(),
phantom: PhantomData,
}
}
@ -452,49 +446,59 @@ impl<'ln> ServoLayoutNode<'ln> {
}
}
pub struct LayoutNodeChildrenIterator<'a, Wrappers: WrapperTypes<'a>> {
current: Option<Wrappers::Node>,
pub struct LayoutNodeChildrenIterator<'a, ConcreteLayoutNode> where ConcreteLayoutNode: LayoutNode<'a> {
current: Option<ConcreteLayoutNode>,
// Satisfy the compiler about the unused lifetime.
phantom: PhantomData<&'a ()>,
}
impl<'a, Wrappers: WrapperTypes<'a>> Iterator for LayoutNodeChildrenIterator<'a, Wrappers> {
type Item = Wrappers::Node;
fn next(&mut self) -> Option<Wrappers::Node> {
impl<'a, ConcreteLayoutNode> Iterator for LayoutNodeChildrenIterator<'a, ConcreteLayoutNode>
where ConcreteLayoutNode: LayoutNode<'a> {
type Item = ConcreteLayoutNode;
fn next(&mut self) -> Option<ConcreteLayoutNode> {
let node = self.current;
self.current = node.and_then(|node| node.next_sibling());
node
}
}
pub struct LayoutNodeReverseChildrenIterator<'a, Wrappers: WrapperTypes<'a>> {
current: Option<Wrappers::Node>,
pub struct LayoutNodeReverseChildrenIterator<'a, ConcreteLayoutNode> where ConcreteLayoutNode: LayoutNode<'a> {
current: Option<ConcreteLayoutNode>,
// Satisfy the compiler about the unused lifetime.
phantom: PhantomData<&'a ()>,
}
impl<'a, Wrappers: WrapperTypes<'a>> Iterator for LayoutNodeReverseChildrenIterator<'a, Wrappers> {
type Item = Wrappers::Node;
fn next(&mut self) -> Option<Wrappers::Node> {
impl<'a, ConcreteLayoutNode> Iterator for LayoutNodeReverseChildrenIterator<'a, ConcreteLayoutNode>
where ConcreteLayoutNode: LayoutNode<'a> {
type Item = ConcreteLayoutNode;
fn next(&mut self) -> Option<ConcreteLayoutNode> {
let node = self.current;
self.current = node.and_then(|node| node.prev_sibling());
node
}
}
pub struct LayoutTreeIterator<'a, Wrappers: WrapperTypes<'a>> {
stack: Vec<Wrappers::Node>,
pub struct LayoutTreeIterator<'a, ConcreteLayoutNode> where ConcreteLayoutNode: LayoutNode<'a> {
stack: Vec<ConcreteLayoutNode>,
// Satisfy the compiler about the unused lifetime.
phantom: PhantomData<&'a ()>,
}
impl<'a, Wrappers> LayoutTreeIterator<'a, Wrappers> where Wrappers: WrapperTypes<'a> {
fn new(root: Wrappers::Node) -> LayoutTreeIterator<'a, Wrappers> {
impl<'a, ConcreteLayoutNode> LayoutTreeIterator<'a, ConcreteLayoutNode> where ConcreteLayoutNode: LayoutNode<'a> {
fn new(root: ConcreteLayoutNode) -> LayoutTreeIterator<'a, ConcreteLayoutNode> {
let mut stack = vec!();
stack.push(root);
LayoutTreeIterator {
stack: stack
stack: stack,
phantom: PhantomData,
}
}
}
impl<'a, Wrappers> Iterator for LayoutTreeIterator<'a, Wrappers> where Wrappers: WrapperTypes<'a> {
type Item = Wrappers::Node;
fn next(&mut self) -> Option<Wrappers::Node> {
impl<'a, ConcreteLayoutNode> Iterator for LayoutTreeIterator<'a, ConcreteLayoutNode>
where ConcreteLayoutNode: LayoutNode<'a> {
type Item = ConcreteLayoutNode;
fn next(&mut self) -> Option<ConcreteLayoutNode> {
let ret = self.stack.pop();
ret.map(|node| self.stack.extend(node.rev_children()));
ret
@ -508,7 +512,10 @@ pub struct ServoLayoutDocument<'ld> {
chain: PhantomData<&'ld ()>,
}
impl<'ld> LayoutDocument<'ld, ServoWrapperTypes<'ld>> for ServoLayoutDocument<'ld> {
impl<'ld> LayoutDocument<'ld> for ServoLayoutDocument<'ld> {
type ConcreteLayoutNode = ServoLayoutNode<'ld>;
type ConcreteLayoutElement = ServoLayoutElement<'ld>;
fn as_node(&self) -> ServoLayoutNode<'ld> {
ServoLayoutNode::from_layout_js(self.document.upcast())
}
@ -539,7 +546,10 @@ pub struct ServoLayoutElement<'le> {
chain: PhantomData<&'le ()>,
}
impl<'le> LayoutElement<'le, ServoWrapperTypes<'le>> for ServoLayoutElement<'le> {
impl<'le> LayoutElement<'le> for ServoLayoutElement<'le> {
type ConcreteLayoutNode = ServoLayoutNode<'le>;
type ConcreteLayoutDocument = ServoLayoutDocument<'le>;
fn as_node(&self) -> ServoLayoutNode<'le> {
ServoLayoutNode::from_layout_js(self.element.upcast())
}