shady-css-parser/dist/shady-css/node-visitor.js

A fast, small and flexible CSS parser.

"use strict";
/**
 * @license
 * Copyright (c) 2016 The Polymer Project Authors. All rights reserved.
 * This code may only be used under the BSD style license found at
 * http://polymer.github.io/LICENSE.txt The complete set of authors may be found
 * at http://polymer.github.io/AUTHORS.txt The complete set of contributors may
 * be found at http://polymer.github.io/CONTRIBUTORS.txt Code distributed by
 * Google as part of the polymer project is also subject to an additional IP
 * rights grant found at http://polymer.github.io/PATENTS.txt
 */
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Class that implements a visitor pattern for ASTs produced by the Parser.
 * Extend the NodeVisitor class to implement useful tree traversal operations
 * such as stringification.
 */
class NodeVisitor {
    /**
     * Create a NodeVisitor instance.
     */
    constructor() {
        this.path_ = [];
    }
    /**
     * A list of nodes that corresponds to the current path through an AST being
     * visited, leading to where the currently visited node will be found.
     */
    get path() {
        return this.path_;
    }
    /**
     * Visit a node. The visited node will be added to the `path` before it is
     * visited, and will be removed after it is visited. Nodes are "visited" by
     * calling a method on the NodeVisitor instance that matches the node's type,
     * if one is available on the NodeVisitor instance.
     * @param node The node to be visited.
     * @return The return value of the method visiting the node, if any.
     */
    visit(node) {
        let result;
        const callback = this[node.type];
        if (callback) {
            this.path_.push(node);
            result = this[node.type](node);
            this.path_.pop();
        }
        return result;
    }
}
exports.NodeVisitor = NodeVisitor;
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