Add system statements ('exc')

YesNt.Interpreter/Utilities/FixedProcess.cs

@@ -0,0 +1,316 @@
+using System;
+using System.Collections;
+using System.Diagnostics;
+using System.IO;
+using System.Text;
+using System.Threading;
+
+namespace YesNt.Interpreter.Utilities
+{
+    internal delegate void UserCallBack(string data);
+
+    public delegate void DataReceivedEventHandler(object sender, DataReceivedEventArgs e);
+
+    public class FixedProcess : Process
+    {
+        internal AsyncStreamReader output;
+        internal AsyncStreamReader error;
+
+        public new event DataReceivedEventHandler OutputDataReceived;
+
+        public new event DataReceivedEventHandler ErrorDataReceived;
+
+        public new void BeginOutputReadLine()
+        {
+            Stream baseStream = StandardOutput.BaseStream;
+            output = new AsyncStreamReader(this, baseStream, new UserCallBack(FixedOutputReadNotifyUser), StandardOutput.CurrentEncoding);
+            output.BeginReadLine();
+        }
+
+        public new void BeginErrorReadLine()
+        {
+            Stream baseStream = StandardError.BaseStream;
+            error = new AsyncStreamReader(this, baseStream, new UserCallBack(FixedErrorReadNotifyUser), StandardError.CurrentEncoding);
+            error.BeginReadLine();
+        }
+
+        internal void FixedOutputReadNotifyUser(string data)
+        {
+            DataReceivedEventHandler outputDataReceived = OutputDataReceived;
+            if (outputDataReceived != null)
+            {
+                DataReceivedEventArgs dataReceivedEventArgs = new DataReceivedEventArgs(data);
+                if (SynchronizingObject != null && SynchronizingObject.InvokeRequired)
+                {
+                    SynchronizingObject.Invoke(outputDataReceived, new object[]
+                    {
+                        this,
+                        dataReceivedEventArgs
+                    });
+                    return;
+                }
+                outputDataReceived(this, dataReceivedEventArgs);
+            }
+        }
+
+        internal void FixedErrorReadNotifyUser(string data)
+        {
+            DataReceivedEventHandler errorDataReceived = ErrorDataReceived;
+            if (errorDataReceived != null)
+            {
+                DataReceivedEventArgs dataReceivedEventArgs = new DataReceivedEventArgs(data);
+                if (SynchronizingObject != null && SynchronizingObject.InvokeRequired)
+                {
+                    SynchronizingObject.Invoke(errorDataReceived, new object[]
+                    {
+                        this,
+                        dataReceivedEventArgs
+                    });
+                    return;
+                }
+                errorDataReceived(this, dataReceivedEventArgs);
+            }
+        }
+    }
+
+    internal class AsyncStreamReader : IDisposable
+    {
+        internal const int DefaultBufferSize = 1024;
+        private Stream stream;
+        private Encoding encoding;
+        private Decoder decoder;
+        private byte[] byteBuffer;
+        private char[] charBuffer;
+        private UserCallBack userCallBack;
+        private bool cancelOperation;
+        private ManualResetEvent eofEvent;
+        private readonly Queue messageQueue;
+        private StringBuilder sb;
+        private bool bLastCarriageReturn;
+        public virtual Encoding CurrentEncoding => encoding;
+        public virtual Stream BaseStream => stream;
+
+        internal AsyncStreamReader(Process process, Stream stream, UserCallBack callback, Encoding encoding) : this(process, stream, callback, encoding, 1024)
+        {
+        }
+
+        internal AsyncStreamReader(Process process, Stream stream, UserCallBack callback, Encoding encoding, int bufferSize)
+        {
+            Init(process, stream, callback, encoding, bufferSize);
+            messageQueue = new Queue();
+        }
+
+        private void Init(Process process, Stream stream, UserCallBack callback, Encoding encoding, int bufferSize)
+        {
+            this.stream = stream;
+            this.encoding = encoding;
+            userCallBack = callback;
+            decoder = encoding.GetDecoder();
+            if (bufferSize < 128)
+            {
+                bufferSize = 128;
+            }
+            byteBuffer = new byte[bufferSize];
+            int _maxCharsPerBuffer = encoding.GetMaxCharCount(bufferSize);
+            charBuffer = new char[_maxCharsPerBuffer];
+            cancelOperation = false;
+            eofEvent = new ManualResetEvent(false);
+            sb = null;
+            bLastCarriageReturn = false;
+        }
+
+        public virtual void Close()
+        {
+            Dispose(true);
+        }
+
+        public void Dispose()
+        {
+            Dispose(true);
+            GC.SuppressFinalize(this);
+        }
+
+        protected virtual void Dispose(bool disposing)
+        {
+            if (disposing && stream != null)
+            {
+                stream.Close();
+            }
+            if (stream != null)
+            {
+                stream = null;
+                encoding = null;
+                decoder = null;
+                byteBuffer = null;
+                charBuffer = null;
+            }
+            if (eofEvent != null)
+            {
+                eofEvent.Close();
+                eofEvent = null;
+            }
+        }
+
+        internal void BeginReadLine()
+        {
+            if (cancelOperation)
+            {
+                cancelOperation = false;
+            }
+            if (sb == null)
+            {
+                sb = new StringBuilder(1024);
+                stream.BeginRead(byteBuffer, 0, byteBuffer.Length, new AsyncCallback(ReadBuffer), null);
+                return;
+            }
+            FlushMessageQueue();
+        }
+
+        internal void CancelOperation()
+        {
+            cancelOperation = true;
+        }
+
+        private void ReadBuffer(IAsyncResult ar)
+        {
+            int num;
+            try
+            {
+                num = stream.EndRead(ar);
+            }
+            catch (IOException)
+            {
+                num = 0;
+            }
+            catch (OperationCanceledException)
+            {
+                num = 0;
+            }
+            if (num == 0)
+            {
+                lock (messageQueue)
+                {
+                    if (sb.Length != 0)
+                    {
+                        messageQueue.Enqueue(sb.ToString());
+                        sb.Length = 0;
+                    }
+                    messageQueue.Enqueue(null);
+                }
+                try
+                {
+                    FlushMessageQueue();
+                    return;
+                }
+                finally
+                {
+                    eofEvent.Set();
+                }
+            }
+            int chars = decoder.GetChars(byteBuffer, 0, num, charBuffer, 0);
+            sb.Append(charBuffer, 0, chars);
+            GetLinesFromStringBuilder();
+            stream.BeginRead(byteBuffer, 0, byteBuffer.Length, new AsyncCallback(ReadBuffer), null);
+        }
+
+        private void GetLinesFromStringBuilder()
+        {
+            int i = 0;
+            int num = 0;
+            int length = sb.Length;
+            if (bLastCarriageReturn && length > 0 && sb[0] == '\n')
+            {
+                i = 1;
+                num = 1;
+                bLastCarriageReturn = false;
+            }
+            while (i < length)
+            {
+                char c = sb[i];
+                if (c == '\r' || c == '\n')
+                {
+                    if (c == '\r' && i + 1 < length && sb[i + 1] == '\n')
+                    {
+                        i++;
+                    }
+
+                    string obj = sb.ToString(num, i + 1 - num);
+
+                    num = i + 1;
+
+                    lock (messageQueue)
+                    {
+                        messageQueue.Enqueue(obj);
+                    }
+                }
+                i++;
+            }
+
+            // Flush Fix: Send Whatever is left in the buffer
+            string endOfBuffer = sb.ToString(num, length - num);
+            lock (messageQueue)
+            {
+                messageQueue.Enqueue(endOfBuffer);
+                num = length;
+            }
+            // End Flush Fix
+
+            if (sb[length - 1] == '\r')
+            {
+                bLastCarriageReturn = true;
+            }
+            if (num < length)
+            {
+                sb.Remove(0, num);
+            }
+            else
+            {
+                sb.Length = 0;
+            }
+            FlushMessageQueue();
+        }
+
+        private void FlushMessageQueue()
+        {
+            while (messageQueue.Count > 0)
+            {
+                lock (messageQueue)
+                {
+                    if (messageQueue.Count > 0)
+                    {
+                        string data = (string)messageQueue.Dequeue();
+                        if (!cancelOperation)
+                        {
+                            userCallBack(data);
+                        }
+                    }
+                }
+            }
+        }
+
+        internal void WaitUtilEOF()
+        {
+            if (eofEvent != null)
+            {
+                eofEvent.WaitOne();
+                eofEvent.Close();
+                eofEvent = null;
+            }
+        }
+    }
+
+    public class DataReceivedEventArgs : EventArgs
+    {
+        internal string _data;
+
+        /// <summary>Gets the line of characters that was written to a redirected <see cref="T:System.Diagnostics.Process" /> output stream.</summary>
+        /// <returns>The line that was written by an associated <see cref="T:System.Diagnostics.Process" /> to its redirected <see cref="P:System.Diagnostics.Process.StandardOutput" /> or <see cref="P:System.Diagnostics.Process.StandardError" /> stream.</returns>
+        /// <filterpriority>2</filterpriority>
+        public string Data => _data;
+
+        internal DataReceivedEventArgs(string data)
+        {
+            _data = data;
+        }
+    }
+}