node returns the node that the cursor is currently positioned on.
()
| 388 | |
| 389 | // node returns the node that the cursor is currently positioned on. |
| 390 | func (c *Cursor) node() *node { |
| 391 | common.Assert(len(c.stack) > 0, "accessing a node with a zero-length cursor stack") |
| 392 | |
| 393 | // If the top of the stack is a leaf node then just return it. |
| 394 | if ref := &c.stack[len(c.stack)-1]; ref.node != nil && ref.isLeaf() { |
| 395 | return ref.node |
| 396 | } |
| 397 | |
| 398 | // Start from root and traverse down the hierarchy. |
| 399 | var n = c.stack[0].node |
| 400 | if n == nil { |
| 401 | n = c.bucket.node(c.stack[0].page.Id(), nil) |
| 402 | } |
| 403 | for _, ref := range c.stack[:len(c.stack)-1] { |
| 404 | common.Assert(!n.isLeaf, "expected branch node") |
| 405 | n = n.childAt(ref.index) |
| 406 | } |
| 407 | common.Assert(n.isLeaf, "expected leaf node") |
| 408 | return n |
| 409 | } |
| 410 | |
| 411 | // elemRef represents a reference to an element on a given page/node. |
| 412 | type elemRef struct { |