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Add some helper methods to util::tree for accessing tree fields (it wasn't possible before due to multiple with_tree_fields implementations)

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Brian J. Burg 2012-10-13 18:13:44 -07:00
parent 69ebb04268
commit d1c6e186bf
1 changed files with 20 additions and 0 deletions
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20
src/servo/util/tree.rs
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@ -34,6 +34,26 @@ pub fn each_child<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T, f: fn(&T) -> bool)
}
}
pub fn first_child<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T) -> Option<T> {
ops.with_tree_fields(node, |tf| tf.first_child)
}
pub fn last_child<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T) -> Option<T> {
ops.with_tree_fields(node, |tf| tf.last_child)
}
pub fn next_sibling<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T) -> Option<T> {
ops.with_tree_fields(node, |tf| tf.next_sibling)
}
pub fn prev_sibling<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T) -> Option<T> {
ops.with_tree_fields(node, |tf| tf.prev_sibling)
}
pub fn parent<T:Copy,O:ReadMethods<T>>(ops: &O, node: &T) -> Option<T> {
ops.with_tree_fields(node, |tf| tf.parent)
}
pub fn empty<T>() -> Tree<T> {
{mut parent: None,
mut first_child: None,