| 1 | /**
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| 2 | * @license
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| 3 | * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
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| 4 | * This code may only be used under the BSD style license found at
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| 5 | * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
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| 6 | * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
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| 7 | * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
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| 8 | * Google as part of the polymer project is also subject to an additional IP
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| 9 | * rights grant found at http://polymer.github.io/PATENTS.txt
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| 10 | */
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| 11 | /**
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| 12 | * Class that implements a visitor pattern for ASTs produced by the Parser.
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| 13 | * Extend the NodeVisitor class to implement useful tree traversal operations
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| 14 | * such as stringification.
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| 15 | */
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| 16 | declare class NodeVisitor<Node extends {
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| 17 | type: any;
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| 18 | }, ReturnValue> {
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| 19 | private path_;
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| 20 | /**
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| 21 | * Create a NodeVisitor instance.
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| 22 | */
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| 23 | constructor();
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| 24 | /**
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| 25 | * A list of nodes that corresponds to the current path through an AST being
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| 26 | * visited, leading to where the currently visited node will be found.
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| 27 | */
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| 28 | readonly path: Node[];
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| 29 | /**
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| 30 | * Visit a node. The visited node will be added to the `path` before it is
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| 31 | * visited, and will be removed after it is visited. Nodes are "visited" by
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| 32 | * calling a method on the NodeVisitor instance that matches the node's type,
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| 33 | * if one is available on the NodeVisitor instance.
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| 34 | * @param node The node to be visited.
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| 35 | * @return The return value of the method visiting the node, if any.
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| 36 | */
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| 37 | visit(node: Node): ReturnValue | undefined;
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| 38 | }
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| 39 | export { NodeVisitor };
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