Interface AstVisitor

Visitor interface for SpEL AST traversal.

Usage pattern:

AstWalker.walk(ast, {
  enterNode(node, ancestors) {
    // Called before traversing children.
    // Return false to skip this node's subtree.
    return true;
  },
  leaveNode(node, ancestors) {
    // Called after all children have been traversed.
  },
});
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The ancestors parameter provides the full path from the root node to the current node's parent (current node NOT included).