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/* ****************************************************************************
*
* Copyright (c) Microsoft Corporation.
*
* This source code is subject to terms and conditions of the Microsoft Public License. A
* copy of the license can be found in the License.html file at the root of this distribution. If
* you cannot locate the Microsoft Public License, please send an email to
* dlr@microsoft.com. By using this source code in any fashion, you are agreeing to be bound
* by the terms of the Microsoft Public License.
*
* You must not remove this notice, or any other, from this software.
*
*
* ***************************************************************************/
using System;
using System.IO;
using System.Dynamic;
using Microsoft.Scripting.Utils;
using System.Threading;
namespace Microsoft.Scripting.Hosting.Shell {
public class BasicConsole : IConsole, IDisposable {
private TextWriter _output;
private TextWriter _errorOutput;
private AutoResetEvent _ctrlCEvent;
private Thread _creatingThread;
public TextWriter Output {
get { return _output; }
set {
ContractUtils.RequiresNotNull(value, "value");
_output = value;
}
}
public TextWriter ErrorOutput {
get { return _errorOutput; }
set {
ContractUtils.RequiresNotNull(value, "value");
_errorOutput = value;
}
}
protected AutoResetEvent CtrlCEvent {
get { return _ctrlCEvent; }
set { _ctrlCEvent = value; }
}
protected Thread CreatingThread {
get { return _creatingThread; }
set { _creatingThread = value; }
}
private ConsoleColor _promptColor;
private ConsoleColor _outColor;
private ConsoleColor _errorColor;
private ConsoleColor _warningColor;
public BasicConsole(bool colorful) {
_output = System.Console.Out;
_errorOutput = System.Console.Error;
SetupColors(colorful);
_creatingThread = Thread.CurrentThread;
#if !SILVERLIGHT // ConsoleCancelEventHandler
Console.CancelKeyPress += new ConsoleCancelEventHandler(delegate(object sender, ConsoleCancelEventArgs e) {
if (e.SpecialKey == ConsoleSpecialKey.ControlC) {
e.Cancel = true;
_ctrlCEvent.Set();
_creatingThread.Abort(new KeyboardInterruptException(""));
}
});
#endif
_ctrlCEvent = new AutoResetEvent(false);
}
private void SetupColors(bool colorful) {
if (colorful) {
_promptColor = PickColor(ConsoleColor.Gray, ConsoleColor.White);
_outColor = PickColor(ConsoleColor.Green, ConsoleColor.White);
_errorColor = PickColor(ConsoleColor.Red, ConsoleColor.White);
_warningColor = PickColor(ConsoleColor.Yellow, ConsoleColor.White);
} else {
#if !SILVERLIGHT
_promptColor = _outColor = _errorColor = _warningColor = Console.ForegroundColor;
#endif
}
}
private static ConsoleColor PickColor(ConsoleColor best, ConsoleColor other) {
#if SILVERLIGHT
return best;
#else
if (Console.BackgroundColor != best) {
return best;
}
return other;
#endif
}
protected void WriteColor(TextWriter output, string str, ConsoleColor c) {
#if !SILVERLIGHT // Console.ForegroundColor
ConsoleColor origColor = Console.ForegroundColor;
Console.ForegroundColor = c;
#endif
output.Write(str);
output.Flush();
#if !SILVERLIGHT // Console.ForegroundColor
Console.ForegroundColor = origColor;
#endif
}
#region IConsole Members
public virtual string ReadLine(int autoIndentSize) {
Write("".PadLeft(autoIndentSize), Style.Prompt);
string res = Console.In.ReadLine();
if (res == null) {
// we have a race - the Ctrl-C event is delivered
// after ReadLine returns. We need to wait for a little
// bit to see which one we got. This will cause a slight
// delay when shutting down the process via ctrl-z, but it's
// not really perceptible. In the ctrl-C case we will return
// as soon as the event is signaled.
#if SILVERLIGHT
if (_ctrlCEvent != null && _ctrlCEvent.WaitOne(100))
#else
if (_ctrlCEvent != null && _ctrlCEvent.WaitOne(100, false))
#endif
{
// received ctrl-C
return "";
} else {
// received ctrl-Z
return null;
}
}
return "".PadLeft(autoIndentSize) + res;
}
public virtual void Write(string text, Style style) {
switch (style) {
case Style.Prompt: WriteColor(_output, text, _promptColor); break;
case Style.Out: WriteColor(_output, text, _outColor); break;
case Style.Error: WriteColor(_errorOutput, text, _errorColor); break;
case Style.Warning: WriteColor(_errorOutput, text, _warningColor); break;
}
}
public void WriteLine(string text, Style style) {
Write(text + Environment.NewLine, style);
}
public void WriteLine() {
Write(Environment.NewLine, Style.Out);
}
#endregion
#region IDisposable Members
public void Dispose() {
if (_ctrlCEvent != null) {
_ctrlCEvent.Close();
}
GC.SuppressFinalize(this);
}
#endregion
}
}
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