1 files changed, 139 insertions, 0 deletions
diff --git a/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/SkipWhile.cs b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/SkipWhile.cs
new file mode 100644
index 0000000..e6e379d
--- /dev/null
+++ b/Rx.NET/System.Reactive.Linq/Reactive/Linq/Observαble/SkipWhile.cs
@@ -0,0 +1,139 @@
+// Copyright (c) Microsoft Open Technologies, Inc. All rights reserved. See License.txt in the project root for license information.
+
+#if !NO_PERF
+using System;
+
+namespace System.Reactive.Linq.Observαble
+{
+    class SkipWhile<TSource> : Producer<TSource>
+    {
+        private readonly IObservable<TSource> _source;
+        private readonly Func<TSource, bool> _predicate;
+        private readonly Func<TSource, int, bool> _predicateI;
+
+        public SkipWhile(IObservable<TSource> source, Func<TSource, bool> predicate)
+        {
+            _source = source;
+            _predicate = predicate;
+        }
+
+        public SkipWhile(IObservable<TSource> source, Func<TSource, int, bool> predicate)
+        {
+            _source = source;
+            _predicateI = predicate;
+        }
+
+        protected override IDisposable Run(IObserver<TSource> observer, IDisposable cancel, Action<IDisposable> setSink)
+        {
+            if (_predicate != null)
+            {
+                var sink = new _(this, observer, cancel);
+                setSink(sink);
+                return _source.SubscribeSafe(sink);
+            }
+            else
+            {
+                var sink = new τ(this, observer, cancel);
+                setSink(sink);
+                return _source.SubscribeSafe(sink);
+            }
+        }
+
+        class _ : Sink<TSource>, IObserver<TSource>
+        {
+            private readonly SkipWhile<TSource> _parent;
+            private bool _running;
+
+            public _(SkipWhile<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
+                : base(observer, cancel)
+            {
+                _parent = parent;
+                _running = false;
+            }
+
+            public void OnNext(TSource value)
+            {
+                if (!_running)
+                {
+                    try
+                    {
+                        _running = !_parent._predicate(value);
+                    }
+                    catch (Exception exception)
+                    {
+                        base._observer.OnError(exception);
+                        base.Dispose();
+                        return;
+                    }
+                }
+
+                if (_running)
+                {
+                    base._observer.OnNext(value);
+                }
+            }
+
+            public void OnError(Exception error)
+            {
+                base._observer.OnError(error);
+                base.Dispose();
+            }
+
+            public void OnCompleted()
+            {
+                base._observer.OnCompleted();
+                base.Dispose();
+            }
+        }
+
+        class τ : Sink<TSource>, IObserver<TSource>
+        {
+            private readonly SkipWhile<TSource> _parent;
+            private bool _running;
+            private int _index;
+
+            public τ(SkipWhile<TSource> parent, IObserver<TSource> observer, IDisposable cancel)
+                : base(observer, cancel)
+            {
+                _parent = parent;
+                _running = false;
+                _index = 0;
+            }
+
+            public void OnNext(TSource value)
+            {
+                if (!_running)
+                {
+                    try
+                    {
+                        _running = !_parent._predicateI(value, checked(_index++));
+                    }
+                    catch (Exception exception)
+                    {
+                        base._observer.OnError(exception);
+                        base.Dispose();
+                        return;
+                    }
+                }
+
+                if (_running)
+                {
+                    base._observer.OnNext(value);
+                }
+            }
+
+            public void OnError(Exception error)
+            {
+                base._observer.OnError(error);
+                base.Dispose();
+            }
+
+            public void OnCompleted()
+            {
+                base._observer.OnCompleted();
+                base.Dispose();
+            }
+        }
+    }
+}
+#endif
+\ No newline at end of file