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using System;
using System.IO;
using System.Text;
namespace StardewModdingAPI.Framework.Logging
{
/// <summary>A text writer which allows intercepting output.</summary>
internal class InterceptingTextWriter : TextWriter
{
/*********
** Fields
*********/
/// <summary>The event raised when a message is written to the console directly.</summary>
private readonly Action<string> OnMessageIntercepted;
/*********
** Accessors
*********/
/// <summary>Prefixing a message with this character indicates that the console interceptor should write the string without intercepting it. (The character itself is not written.)</summary>
public const char IgnoreChar = '\u200B';
/// <summary>The underlying console output.</summary>
public TextWriter Out { get; }
/// <inheritdoc />
public override Encoding Encoding => this.Out.Encoding;
/// <summary>Whether the text writer should ignore the next input if it's a newline.</summary>
/// <remarks>This is used when log output is suppressed from the console, since <c>Console.WriteLine</c> writes the trailing newline as a separate call.</remarks>
public bool IgnoreNextIfNewline { get; set; }
/*********
** Public methods
*********/
/// <summary>Construct an instance.</summary>
/// <param name="output">The underlying output writer.</param>
/// <param name="onMessageIntercepted">The event raised when a message is written to the console directly.</param>
public InterceptingTextWriter(TextWriter output, Action<string> onMessageIntercepted)
{
this.Out = output;
this.OnMessageIntercepted = onMessageIntercepted;
}
/// <inheritdoc />
public override void Write(char[] buffer, int index, int count)
{
// track newline skip
bool ignoreIfNewline = this.IgnoreNextIfNewline;
this.IgnoreNextIfNewline = false;
// get first character if valid
if (count == 0 || index < 0 || index >= buffer.Length)
{
this.Out.Write(buffer, index, count);
return;
}
char firstChar = buffer[index];
// handle output
if (firstChar == InterceptingTextWriter.IgnoreChar)
this.Out.Write(buffer, index + 1, count - 1);
else if (char.IsControl(firstChar) && firstChar is not ('\r' or '\n'))
this.Out.Write(buffer, index, count);
else if (this.IsEmptyOrNewline(buffer))
{
if (!ignoreIfNewline)
this.Out.Write(buffer, index, count);
}
else
this.OnMessageIntercepted(new string(buffer, index, count));
}
/// <inheritdoc />
public override void Write(char ch)
{
this.Out.Write(ch);
}
/*********
** Private methods
*********/
/// <summary>Get whether a buffer represents a line break.</summary>
/// <param name="buffer">The buffer to check.</param>
private bool IsEmptyOrNewline(char[] buffer)
{
foreach (char ch in buffer)
{
if (ch != '\n' && ch != '\r')
return false;
}
return true;
}
}
}
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