private static bool TryPrepareSharplabPreview(string url, int markdownLength, out string?preview)
{
if (!url.Contains("#v2:"))
{
preview = null;
return(false);
}
try
{
// Decode the compressed code from the URL payload
var base64Text = url.Substring(url.IndexOf("#v2:") + "#v2:".Length);
var plainText = LZString.DecompressFromBase64(base64Text);
// Extract the option and get the target language
var textParts = Regex.Match(plainText, @"([^|]*)\|([\s\S]*)$");
var languageOption = Regex.Match(textParts.Groups[1].Value, @"l:(\w+)");
var language = languageOption.Success ? languageOption.Groups[1].Value : "cs";
var sourceCode = textParts.Groups[2].Value;
// Replace the compression tokens
if (language is "cs")
{
sourceCode = ReplaceTokens(sourceCode, _sharplabCSTokens);
// Strip using directives
sourceCode = Regex.Replace(sourceCode, @"using \w+(?:\.\w+)*;", string.Empty);
}
else if (language is "il")
{
sourceCode = ReplaceTokens(sourceCode, _sharplabILTokens);
}
else
{
sourceCode = sourceCode.Replace("@@", "@");
}
var maxPreviewLength = EmbedBuilder.MaxDescriptionLength - (markdownLength + language.Length + "```\n\n```".Length);
preview = FormatUtilities.FormatCodeForEmbed(language, sourceCode, maxPreviewLength);
return(!string.IsNullOrWhiteSpace(preview));
}
catch
{
preview = null;
return(false);
}
}
private void VerifyWithLength(string language, int length, string source, string expected)
{
var actual = FormatUtilities.FormatCodeForEmbed(language, source, length);
actual.ShouldBe(expected.Replace("\r", string.Empty));
}