146 lines
5.2 KiB
C#
146 lines
5.2 KiB
C#
//
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// SequenceExtensions.cs
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//
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// Authors:
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// Alexander Chebaturkin (chebaturkin@gmail.com)
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//
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// Copyright (C) 2011 Alexander Chebaturkin
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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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namespace Mono.CodeContracts.Static.DataStructures {
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public static class SequenceExtensions {
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public static Sequence<T> Cons<T> (this Sequence<T> rest, T elem)
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{
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return Sequence<T>.Cons (elem, rest);
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}
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public static Sequence<T> Append<T> (this Sequence<T> list, Sequence<T> append)
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{
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if (list == null)
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return append;
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if (append == null)
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return list;
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return Cons (list.Tail.Append (append), list.Head);
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}
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public static Sequence<T> Where<T> (this Sequence<T> list, Predicate<T> keep)
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{
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if (list == null)
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return null;
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Sequence<T> rest = list.Tail.Where (keep);
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if (!keep (list.Head))
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return rest;
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if (rest == list.Tail)
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return list;
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return Cons (rest, list.Head);
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}
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public static void Apply<T> (this Sequence<T> list, Action<T> action)
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{
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Sequence<T>.Apply (list, action);
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}
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public static IEnumerable<T> AsEnumerable<T> (this Sequence<T> list)
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{
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return Sequence<T>.PrivateGetEnumerable (list);
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}
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public static bool Any<T> (this Sequence<T> list, Predicate<T> predicate)
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{
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if (list == null)
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return false;
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if (predicate (list.Head))
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return true;
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return list.Tail.Any (predicate);
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}
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public static bool All<T> (this Sequence<T> list, Predicate<T> predicate)
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{
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if (list == null)
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return true;
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if (!predicate (list.Head))
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return false;
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return list.Tail.All (predicate);
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}
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public static int Length<T> (this Sequence<T> list)
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{
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return Sequence<T>.LengthOf (list);
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}
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public static bool IsEmpty<T> (this Sequence<T> list)
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{
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return list == null;
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}
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public static Sequence<S> Select<T, S> (this Sequence<T> list, Func<T, S> selector)
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{
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return Sequence<T>.Select (list, selector);
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}
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public static T Last<T> (this Sequence<T> list)
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{
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if (list == null)
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return default(T);
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while (Sequence<T>.LengthOf (list) > 1)
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list = list.Tail;
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return list.Head;
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}
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public static Sequence<T> Coerce<S, T> (this Sequence<S> list)
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where S : T
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{
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return list.Select (l => (T) l);
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}
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public static Sequence<T> Reverse<T> (this Sequence<T> list)
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{
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Sequence<T> rest = null;
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for (Sequence<T> cur = list; cur != null; cur = cur.Tail)
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rest = rest.Cons (cur.Head);
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return rest;
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}
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public static void ForEach<T> (this Sequence<T> seq, Action<T> action)
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{
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if (seq == null)
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return;
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action (seq.Head);
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seq.Tail.ForEach (action);
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}
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}
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} |