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Library/PackageCache/com.unity.2d.spriteshape@3.0.14/Runtime/External/LibTessDotNet/Dict.cs

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+/*
+** SGI FREE SOFTWARE LICENSE B (Version 2.0, Sept. 18, 2008) 
+** Copyright (C) 2011 Silicon Graphics, Inc.
+** All Rights Reserved.
+**
+** Permission is hereby granted, free of charge, to any person obtaining a copy
+** of this software and associated documentation files (the "Software"), to deal
+** in the Software without restriction, including without limitation the rights
+** to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
+** of the Software, and to permit persons to whom the Software is furnished to do so,
+** subject to the following conditions:
+** 
+** The above copyright notice including the dates of first publication and either this
+** permission notice or a reference to http://oss.sgi.com/projects/FreeB/ shall be
+** included in all copies or substantial portions of the Software. 
+**
+** THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
+** INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A
+** PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL SILICON GRAPHICS, INC.
+** BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
+** TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE
+** OR OTHER DEALINGS IN THE SOFTWARE.
+** 
+** Except as contained in this notice, the name of Silicon Graphics, Inc. shall not
+** be used in advertising or otherwise to promote the sale, use or other dealings in
+** this Software without prior written authorization from Silicon Graphics, Inc.
+*/
+/*
+** Original Author: Eric Veach, July 1994.
+** libtess2: Mikko Mononen, http://code.google.com/p/libtess2/.
+** LibTessDotNet: Remi Gillig, https://github.com/speps/LibTessDotNet
+*/
+
+namespace Unity.SpriteShape.External
+{
+
+namespace LibTessDotNet
+{
+    internal class Dict<TValue> where TValue : class
+    {
+        public class Node
+        {
+            internal TValue _key;
+            internal Node _prev, _next;
+
+            public TValue Key { get { return _key; } }
+            public Node Prev { get { return _prev; } }
+            public Node Next { get { return _next; } }
+        }
+
+        public delegate bool LessOrEqual(TValue lhs, TValue rhs);
+
+        private LessOrEqual _leq;
+        Node _head;
+
+        public Dict(LessOrEqual leq)
+        {
+            _leq = leq;
+
+            _head = new Node { _key = null };
+            _head._prev = _head;
+            _head._next = _head;
+        }
+
+        public Node Insert(TValue key)
+        {
+            return InsertBefore(_head, key);
+        }
+
+        public Node InsertBefore(Node node, TValue key)
+        {
+            do {
+                node = node._prev;
+            } while (node._key != null && !_leq(node._key, key));
+
+            var newNode = new Node { _key = key };
+            newNode._next = node._next;
+            node._next._prev = newNode;
+            newNode._prev = node;
+            node._next = newNode;
+
+            return newNode;
+        }
+
+        public Node Find(TValue key)
+        {
+            var node = _head;
+            do {
+                node = node._next;
+            } while (node._key != null && !_leq(key, node._key));
+            return node;
+        }
+
+        public Node Min()
+        {
+            return _head._next;
+        }
+
+        public void Remove(Node node)
+        {
+            node._next._prev = node._prev;
+            node._prev._next = node._next;
+        }
+    }
+}
+
+} // namespace Unity.VectorGraphics.External