122 lines
3.8 KiB
C#
122 lines
3.8 KiB
C#
//
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// Object.cs: C# extension methods on object.
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//
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// Author:
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// Jonathan Pryor <jpryor@novell.com>
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// leppie (http://xacc.wordpress.com/)
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//
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// Copyright (c) 2008-2009 Novell, Inc. (http://www.novell.com)
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// Copyright (c) 2009 leppie (http://xacc.wordpress.com/)
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//
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// Permission is hereby granted, free of charge, to any person obtaining
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// a copy of this software and associated documentation files (the
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// "Software"), to deal in the Software without restriction, including
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// without limitation the rights to use, copy, modify, merge, publish,
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// distribute, sublicense, and/or sell copies of the Software, and to
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// permit persons to whom the Software is furnished to do so, subject to
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// the following conditions:
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//
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// The above copyright notice and this permission notice shall be
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// included in all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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// EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
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// LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
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// OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
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// WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
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//
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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Linq.Expressions;
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namespace Mono.Rocks {
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static class Check {
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public static void ChildrenSelector (object childrenSelector)
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{
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if (childrenSelector == null)
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throw new ArgumentNullException ("childrenSelector");
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}
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public static void Destination (object destination)
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{
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if (destination == null)
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throw new ArgumentNullException ("destination");
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}
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public static void Self (object self)
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{
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if (self == null)
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throw new ArgumentNullException ("self");
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}
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public static void ValueSelector (object valueSelector)
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{
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if (valueSelector == null)
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throw new ArgumentNullException ("valueSelector");
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}
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}
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public static class ObjectRocks {
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#region Tree Traversal Methods
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/*
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* Tree Traversal Methods courtesy of:
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* http://xacc.wordpress.com/2009/03/05/tree-traversal-extension-methods/
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*/
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public static IEnumerable<TResult> TraverseDepthFirst<TSource, TResult>(
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this TSource self,
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Func<TSource, TResult> valueSelector,
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Func<TSource, IEnumerable<TSource>> childrenSelector)
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{
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return self.TraverseDepthFirstWithParent (valueSelector, childrenSelector)
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.Select(x => x.Value);
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}
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public static IEnumerable<KeyValuePair<TSource, TResult>> TraverseDepthFirstWithParent<TSource, TResult>(
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this TSource self,
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Func<TSource, TResult> valueSelector,
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Func<TSource, IEnumerable<TSource>> childrenSelector)
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{
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return self.TraverseDepthFirstWithParent (default (TSource), valueSelector, childrenSelector);
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}
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static IEnumerable<KeyValuePair<TSource, TResult>> TraverseDepthFirstWithParent<TSource, TResult>(
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this TSource self,
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TSource parent,
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Func<TSource, TResult> valueSelector,
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Func<TSource, IEnumerable<TSource>> childrenSelector)
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{
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Check.Self (self);
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Check.ValueSelector (valueSelector);
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Check.ChildrenSelector (childrenSelector);
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return CreateTraverseDepthFirstWithParentIterator (self, parent, valueSelector, childrenSelector);
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}
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static IEnumerable<KeyValuePair<TSource, TResult>> CreateTraverseDepthFirstWithParentIterator<TSource, TResult>(
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this TSource self,
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TSource parent,
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Func<TSource, TResult> valueSelector,
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Func<TSource, IEnumerable<TSource>> childrenSelector)
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{
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yield return new KeyValuePair<TSource, TResult>(parent, valueSelector (self));
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foreach (var c in childrenSelector (self))
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{
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foreach (var item in c.TraverseDepthFirstWithParent(c, valueSelector, childrenSelector))
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{
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yield return item;
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}
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}
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}
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#endregion
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}
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}
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