private static IEnumerable <SyntaxTrivia> ConvertVBTrivia(SyntaxTrivia t)
{
if (t.IsKind(VBSyntaxKind.CommentTrivia))
{
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.SingleLineCommentTrivia, $"// {t.GetCommentText()}"));
yield break;
}
if (t.IsKind(VBSyntaxKind.DocumentationCommentTrivia))
{
var previousWhitespace = t.GetPreviousTrivia(t.SyntaxTree, CancellationToken.None).ToString().Trim('\r', '\n');
var commentTextLines = t.GetCommentText().Replace("\r\n", "\n").Replace("\r", "\n").Split('\n');
var outputCommentText = "/// " + String.Join($"\r\n{previousWhitespace}/// ", commentTextLines);
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.SingleLineCommentTrivia, outputCommentText)); //It's always single line...even when it has multiple lines
yield return(_endOfLine);
yield break;
}
if (t.IsKind(VBSyntaxKind.WhitespaceTrivia))
{
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.WhitespaceTrivia, t.ToString()));
yield break;
}
if (t.IsKind(VBSyntaxKind.EndOfLineTrivia))
{
// Mapping one to one here leads to newlines appearing where the natural line-end was in VB.
// e.g. ToString\r\n()
// Because C Sharp needs those brackets. Handling each possible case of this is far more effort than it's worth.
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.EndOfLineTrivia, t.ToString()));
yield break;
}
if (t.HasStructure)
{
bool wasConverted = false;
foreach (var converted in ConvertStructuredVBTrivia(t))
{
yield return(converted);
wasConverted = true;
}
if (wasConverted)
{
yield break;
}
}
//Each of these would need its own method to recreate for C# with the right structure probably so let's just warn about them for now.
var convertedKind = t.GetCSKind();
yield return(convertedKind.HasValue
? SyntaxFactory.Comment(@$ "/* TODO ERROR: Skipped {convertedKind.Value}
{t.ToFullString()}*/")
: default(SyntaxTrivia));
}
private static IEnumerable <SyntaxTrivia> ConvertVBTrivia(SyntaxTrivia t)
{
var endOfLine = SyntaxFactory.EndOfLine(Environment.NewLine);
if (t.IsKind(VBSyntaxKind.CommentTrivia))
{
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.SingleLineCommentTrivia, $"// {t.GetCommentText()}"));
yield break;
}
if (t.IsKind(VBSyntaxKind.DocumentationCommentTrivia))
{
var previousWhitespace = t.GetPreviousTrivia(t.SyntaxTree, CancellationToken.None).ToString().Trim('\r', '\n');
var commentTextLines = t.GetCommentText().Replace("\r\n", "\n").Replace("\r", "\n").Split('\n');
var outputCommentText = "/// " + String.Join($"\r\n{previousWhitespace}/// ", commentTextLines) + Environment.NewLine;
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.SingleLineCommentTrivia, outputCommentText)); //It's always single line...even when it has multiple lines
yield break;
}
if (t.IsKind(VBSyntaxKind.WhitespaceTrivia))
{
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.WhitespaceTrivia, t.ToString()));
yield break;
}
if (t.IsKind(VBSyntaxKind.EndOfLineTrivia))
{
// Mapping one to one here leads to newlines appearing where the natural line-end was in VB.
// e.g. ToString\r\n()
// Because C Sharp needs those brackets. Handling each possible case of this is far more effort than it's worth.
yield return(SyntaxFactory.SyntaxTrivia(CSSyntaxKind.EndOfLineTrivia, t.ToString()));
yield break;
}
if (t.HasStructure && t.GetStructure() is VBSyntax.RegionDirectiveTriviaSyntax rdts)
{
var regionDirective = SyntaxFactory.RegionDirectiveTrivia(true);
var regionKeyword = regionDirective.RegionKeyword.WithTrailingTrivia(SyntaxFactory.Space);
var endOfDirectiveToken = regionDirective.EndOfDirectiveToken.WithLeadingTrivia(SyntaxFactory.PreprocessingMessage(rdts.Name.Text.Trim('"'))).WithTrailingTrivia(endOfLine);
yield return(SyntaxFactory.Trivia(regionDirective.WithRegionKeyword(regionKeyword).WithEndOfDirectiveToken(endOfDirectiveToken)));
yield break;
}
if (t.IsKind(VBSyntaxKind.EndRegionDirectiveTrivia))
{
yield return(SyntaxFactory.Trivia(SyntaxFactory.EndRegionDirectiveTrivia(true).WithTrailingTrivia(endOfLine)));
yield break;
}
//Each of these would need its own method to recreate for C# with the right structure probably so let's just warn about them for now.
var convertedKind = t.GetCSKind();
yield return(convertedKind.HasValue
? SyntaxFactory.Comment($"/* TODO ERROR: Skipped {convertedKind.Value} */")
: default(SyntaxTrivia));
}
