/// <summary>
/// Writes the diagnostic and the offending code.
/// </summary>
/// <returns>A string for use in assert exception.</returns>
internal static string ToErrorString(this Diagnostic diagnostic, string padding = "")
{
var idAndPosition = diagnostic.Location.GetMappedLineSpan();
var code = diagnostic.Location.SourceTree?.GetText(CancellationToken.None).ToString() ?? string.Empty;
var line = CodeReader.GetLineWithErrorIndicated(code, idAndPosition.StartLinePosition);
return($"{padding}{diagnostic.Id} {diagnostic.GetMessage(CultureInfo.InvariantCulture)}\r\n" +
$"{padding} at line {idAndPosition.StartLinePosition.Line} and character {idAndPosition.StartLinePosition.Character} in file {idAndPosition.Path} | {line.TrimStart(' ')}");
}
/// <summary>
/// Writes the diagnostic and the offending code.
/// </summary>
/// <returns>A string for use in assert exception</returns>
internal static string ToString(this Diagnostic diagnostic, IReadOnlyList <string> sources)
{
var idAndPosition = diagnostic.Location.GetMappedLineSpan();
var match = sources.SingleOrDefault(x => CodeReader.FileName(x) == idAndPosition.Path);
var line = match != null?CodeReader.GetLineWithErrorIndicated(match, idAndPosition.StartLinePosition) : string.Empty;
return($"{diagnostic.Id} {diagnostic.GetMessage(CultureInfo.InvariantCulture)}\r\n" +
$" at line {idAndPosition.StartLinePosition.Line} and character {idAndPosition.StartLinePosition.Character} in file {idAndPosition.Path} | {line.TrimStart(' ')}");
}
public static void GetLineWithErrorIndicated(int line, int character, string expected)
{
var code = @"using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace N
{
class CodeReaderTests
{
}
}";
Assert.AreEqual(expected, CodeReader.GetLineWithErrorIndicated(code, new LinePosition(line, character)));
}