public static async Task <String> TryGetHighlightedCodeAsync([NotNull] String code, [NotNull] String path,
SyntaxHighlightStyle style, bool lineNumbers, CancellationToken token)
{
// Check if the code is possibly invalid
const int threshold = 50, length = 1000;
if (code.Substring(0, length > code.Length ? code.Length : length).Count(
c => char.IsControl(c) && c != '\n' && c != '\r' && c != '\t') > threshold)
{
return(null);
}
// Try to extract the code language
Match match = Regex.Match(path, @".*([.]\w+)");
if (!match.Success || match.Groups.Count != 2)
{
return(null);
}
String
extension = match.Groups[1].Value.ToLowerInvariant(),
lexer = UncommonExtensions.ContainsKey(extension)
? UncommonExtensions[extension]
: extension.Substring(1); // Remove the leading '.'
// Prepare the POST request content
Dictionary <String, String> values = new Dictionary <String, String>
{
{ "code", code }, // The code to highlight
{ "lexer", lexer }, // The code language
{ "style", style.ToString().ToLowerInvariant() }, // The requested syntax highlight style
{ "divstyles", "border:solid gray;border-width:.0em .0em .0em .0em;padding:.2em .6em;" }, // Default CSS properties
{ "linenos", lineNumbers ? "pls" : String.Empty } // Includes the line numbers if not empty
};
// Make the POST
WrappedHTTPWebResult <String> result = await HTTPHelper.POSTWithCacheSupportAsync(APIUrl, values, token);
// Check if the lexer is unsupported
if (result.StatusCode == HttpStatusCode.InternalServerError)
{
#if DEBUG
//For debugging, inform if an unsupported extesion is found
System.Diagnostics.Debug.WriteLine($"Possible unsupported extension: {extension} > {lexer}");
#endif
// Retry with the fallback lexer
values["lexer"] = FallbackLexer;
return((await HTTPHelper.POSTWithCacheSupportAsync(APIUrl, values, token)).Result);
}
// Return the result
return(result.Result);
}
/// <summary> /// Calls the default Equals method for the inner result of the wrapped instance /// </summary> /// <param name="other">The other instance to compare</param> public bool Equals(WrappedHTTPWebResult <T> other) => Equals(other.Result);
