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Add traverse_{pre,post}order_prune

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This commit is contained in:
Keegan McAllister 2013-07-29 13:14:10 -07:00
parent 5e90722100
commit f582a76b4b
2 changed files with 39 additions and 4 deletions
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3
src/components/main/layout/flow.rs
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@ -79,6 +79,9 @@ impl FlowContext {
/// Like traverse_preorder, but don't end the whole traversal if the callback
/// returns false.
//
// FIXME: Unify this with traverse_preorder_prune, which takes a separate
// 'prune' function.
fn partially_traverse_preorder(&self, callback: &fn(FlowContext) -> bool) {
if !callback((*self).clone()) {
return;

40
src/components/util/tree.rs
View file

@ -69,6 +69,20 @@ pub trait TreeUtils {
/// Iterates over this node and all its descendants, in postorder.
fn traverse_postorder(&self, callback: &fn(Self) -> bool) -> bool;
/// Like traverse_preorder but calls 'prune' first on each node. If it returns true then we
/// skip the whole subtree but continue iterating.
///
/// 'prune' is a separate function a) for compatibility with the 'for' protocol,
/// b) so that the postorder version can still prune before traversing.
fn traverse_preorder_prune(&self, prune: &fn(&Self) -> bool, callback: &fn(Self) -> bool) -> bool;
/// Like traverse_postorder but calls 'prune' first on each node. If it returns true then we
/// skip the whole subtree but continue iterating.
///
/// NB: 'prune' is called *before* traversing children, even though this is a
/// postorder traversal.
fn traverse_postorder_prune(&self, prune: &fn(&Self) -> bool, callback: &fn(Self) -> bool) -> bool;
}
impl<NR:TreeNodeRef<N>,N:TreeNode<NR>> TreeUtils for NR {
@ -146,14 +160,19 @@ impl<NR:TreeNodeRef<N>,N:TreeNode<NR>> TreeUtils for NR {
true
}
fn traverse_preorder(&self, callback: &fn(NR) -> bool) -> bool {
fn traverse_preorder_prune(&self, prune: &fn(&NR) -> bool, callback: &fn(NR) -> bool) -> bool {
// prune shouldn't mutate, so don't clone
if prune(self) {
return true;
}
if !callback((*self).clone()) {
return false;
}
for self.each_child |kid| {
// FIXME: Work around rust#2202. We should be able to pass the callback directly.
if !kid.traverse_preorder(|a| callback(a)) {
if !kid.traverse_preorder_prune(|a| prune(a), |a| callback(a)) {
return false;
}
}
@ -161,15 +180,28 @@ impl<NR:TreeNodeRef<N>,N:TreeNode<NR>> TreeUtils for NR {
true
}
fn traverse_postorder(&self, callback: &fn(NR) -> bool) -> bool {
fn traverse_postorder_prune(&self, prune: &fn(&NR) -> bool, callback: &fn(NR) -> bool) -> bool {
// prune shouldn't mutate, so don't clone
if prune(self) {
return true;
}
for self.each_child |kid| {
// FIXME: Work around rust#2202. We should be able to pass the callback directly.
if !kid.traverse_postorder(|a| callback(a)) {
if !kid.traverse_postorder_prune(|a| prune(a), |a| callback(a)) {
return false;
}
}
callback((*self).clone())
}
fn traverse_preorder(&self, callback: &fn(NR) -> bool) -> bool {
self.traverse_preorder_prune(|_| false, callback)
}
fn traverse_postorder(&self, callback: &fn(NR) -> bool) -> bool {
self.traverse_postorder_prune(|_| false, callback)
}
}