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Add NodePath::last_5_as #22

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Add NodePath::last_5_as #22

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21 changes: 21 additions & 0 deletions packages/sqltk/src/transform.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -117,6 +117,27 @@ impl<'ast> NodePath<'ast> {
))
}

/// Returns the last 5 nodes in the path. The leftmost node in the tuple is the shallowest ancestor and the
/// rightmost node is the current node.
///
/// Returns `Some(nodes)` on success, `None` if there are less than 4 nodes in the path.
pub fn last_5_as<E, D, C, B, A>(&self) -> Option<(&'ast E, &'ast D, &'ast C, &'ast B, &'ast A)>
where
E: Visitable,
D: Visitable,
C: Visitable,
B: Visitable,
A: Visitable,
{
Some((
self.nth_last_as(4)?,
self.nth_last_as(3)?,
self.nth_last_as(2)?,
self.nth_last_as(1)?,
self.nth_last_as(0)?,
))
}

pub fn nth_last_as<N: Visitable>(&self, nth: usize) -> Option<&'ast N> {
let len = self.node_path.len();
if len > nth {
Expand Down