blockly > LineCursor > getPreviousNode
LineCursor.getPreviousNode() method
Get the previous node in the AST, optionally allowing for loopback.
Signature:
getPreviousNode(node: IFocusableNode | null, isValid: (p1: IFocusableNode | null) => boolean, loop: boolean): IFocusableNode | null;
Parameters
| Parameter | Type | Description |
|---|---|---|
| node | IFocusableNode | null | The current position in the AST. |
| isValid | (p1: IFocusableNode | null) => boolean | A function true/false depending on whether the given node should be traversed. |
| loop | boolean | Whether to loop around to the end of the workspace if no valid node was found. |
Returns:
IFocusableNode | null
The previous node in the traversal or null if no previous node exists.