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Pods/SwiftSoup/Sources/NodeTraversor.swift

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+//
+//  NodeTraversor.swift
+//  SwiftSoup
+//
+//  Created by Nabil Chatbi on 17/10/16.
+//  Copyright © 2016 Nabil Chatbi.. All rights reserved.
+//
+
+import Foundation
+
+class NodeTraversor {
+    private let visitor: NodeVisitor
+
+    /**
+     * Create a new traversor.
+     * @param visitor a class implementing the {@link NodeVisitor} interface, to be called when visiting each node.
+     */
+    public init(_ visitor: NodeVisitor) {
+        self.visitor = visitor
+    }
+
+    /**
+     * Start a depth-first traverse of the root and all of its descendants.
+     * @param root the root node point to traverse.
+     */
+    open func traverse(_ root: Node?)throws {
+        var node: Node? = root
+        var depth: Int = 0
+
+        while (node != nil) {
+			try visitor.head(node!, depth)
+			if (node!.childNodeSize() > 0) {
+				node = node!.childNode(0)
+				depth+=1
+			} else {
+				while (node!.nextSibling() == nil && depth > 0) {
+					try visitor.tail(node!, depth)
+					node = node!.getParentNode()
+					depth-=1
+				}
+				try visitor.tail(node!, depth)
+				if (node === root) {
+					break
+				}
+				node = node!.nextSibling()
+			}
+        }
+    }
+
+}