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using System;
using System.Collections.Generic;
using System.IO;
using System.Text;
namespace StardewModdingAPI.Framework.Logging
{
/// <summary>A text writer which allows intercepting output.</summary>
internal class InterceptingTextWriter : TextWriter
{
/*********
** Properties
*********/
/// <summary>The current line being intercepted.</summary>
private readonly List<char> Line = new List<char>();
/*********
** Accessors
*********/
/// <summary>The underlying console output.</summary>
public TextWriter Out { get; }
/// <summary>The character encoding in which the output is written.</summary>
public override Encoding Encoding => this.Out.Encoding;
/// <summary>Whether to intercept console output.</summary>
public bool ShouldIntercept { get; set; }
/// <summary>The event raised when a line of text is intercepted.</summary>
public event Action<string> OnLineIntercepted;
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="output">The underlying output writer.</param>
public InterceptingTextWriter(TextWriter output)
{
this.Out = output;
}
/// <summary>Writes a character to the text string or stream.</summary>
/// <param name="ch">The character to write to the text stream.</param>
public override void Write(char ch)
{
// intercept
if (this.ShouldIntercept)
{
switch (ch)
{
case '\r':
return;
case '\n':
this.OnLineIntercepted?.Invoke(new string(this.Line.ToArray()));
this.Line.Clear();
break;
default:
this.Line.Add(ch);
break;
}
}
// pass through
else
this.Out.Write(ch);
}
/// <summary>Releases the unmanaged resources used by the <see cref="T:System.IO.TextWriter" /> and optionally releases the managed resources.</summary>
/// <param name="disposing">true to release both managed and unmanaged resources; false to release only unmanaged resources.</param>
protected override void Dispose(bool disposing)
{
this.OnLineIntercepted = null;
}
}
}
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