private void MergeExtensions(
List <string> extensionList,
HashSet <Delimiter> delimiters,
HashSet <Language> languageValues,
HashSet <string> binaryExtensions)
{
ScanInfo scanInfo = new ScanInfo(delimiters, languageValues);
foreach (string extension in extensionList)
{
if (binaryExtensions.Contains(extension))
{
// If we get this error, then ScanInfo.xml has assigned the extension as both binary and non-binary.
throw new InvalidOperationException(extension + " has already been listed as a binary extension in ScanInfo.xml.");
}
ScanInfo existingScanInfo;
if (this.extensions.TryGetValue(extension, out existingScanInfo))
{
ScanInfo mergedScanInfo = ScanInfo.Merge(scanInfo, existingScanInfo);
this.extensions[extension] = mergedScanInfo;
}
else
{
this.extensions.TryAdd(extension, scanInfo);
}
}
}
public static ScanInfo Get(FileItem file)
{
ScanInfo result;
Cache cache = LazyCache.Value;
string extension = Path.GetExtension(file.FileName);
if (cache.TryGet(extension, out result))
{
// Binary extensions will return the Unscannable instance.
if (result.IsScannable)
{
// If the file is open in a document that is using a language that doesn't match one
// associated with its file extension, then we need to include the language's info too.
// We won't do this for PlainText because it has no comment delimiter, which can
// cause ambiguities and duplicates if it's paired with an extension with known
// delimiters. For example, .bat files have delimiters, but they open as PlainText.
Language docLanguage = file.DocumentLanguage;
if (docLanguage != Language.Unknown &&
docLanguage != Language.PlainText &&
!result.languages.Contains(docLanguage))
{
ScanInfo languageScanInfo;
if (cache.TryGet(docLanguage, out languageScanInfo))
{
result = ScanInfo.Merge(result, languageScanInfo);
}
}
}
}
else
{
// The file's extension is unknown, so try to match it by language if a document is open.
// This allows us to handle user-assigned extensions (e.g., .scs for C#).
Language docLanguage = file.DocumentLanguage;
if (docLanguage != Language.Unknown)
{
cache.TryGet(docLanguage, out result);
}
if (result == null)
{
result = Infer(file, cache);
}
}
return(result ?? Unscannable);
}