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Pods/SwiftSoup/Sources/NodeVisitor.swift

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+//
+//  NodeVisitor.swift
+//  SwiftSoup
+//
+//  Created by Nabil Chatbi on 16/10/16.
+//  Copyright © 2016 Nabil Chatbi.. All rights reserved.
+//
+
+import Foundation
+
+/**
+ * Node visitor interface. Provide an implementing class to {@link NodeTraversor} to iterate through nodes.
+ * <p>
+ * This interface provides two methods, {@code head} and {@code tail}. The head method is called when the node is first
+ * seen, and the tail method when all of the node's children have been visited. As an example, head can be used to
+ * create a start tag for a node, and tail to create the end tag.
+ * </p>
+ */
+public protocol NodeVisitor {
+    /**
+     * Callback for when a node is first visited.
+     *
+     * @param node the node being visited.
+     * @param depth the depth of the node, relative to the root node. E.g., the root node has depth 0, and a child node
+     * of that will have depth 1.
+     */
+    func head(_ node: Node, _ depth: Int)throws
+
+    /**
+     * Callback for when a node is last visited, after all of its descendants have been visited.
+     *
+     * @param node the node being visited.
+     * @param depth the depth of the node, relative to the root node. E.g., the root node has depth 0, and a child node
+     * of that will have depth 1.
+     */
+    func tail(_ node: Node, _ depth: Int)throws
+}