public async Task <Solution> ProcessAsync(
Document document,
SyntaxNode syntaxRoot,
CancellationToken cancellationToken)
{
if (m_unwrittenWritableFields == null)
{
using (await SemaphoreLock.GetAsync(m_processUsagesLock))
{
// A global analysis must be run before we can do any actual processing, because a field might
// be written in a different file than it is declared (even private ones may be split between
// partial classes).
// It's also quite expensive, which is why it's being done inside the lock, so
// that the entire solution is not processed for each input file individually
if (m_unwrittenWritableFields == null)
{
List <Document> allDocuments =
document.Project.Solution.Projects.SelectMany(p => p.Documents).ToList();
HashSet <IFieldSymbol>[] fields = await Task.WhenAll(
allDocuments
.AsParallel()
.Select(
doc => WritableFieldScanner.Scan(doc, cancellationToken)));
var writableFields = new ConcurrentDictionary <IFieldSymbol, bool>(
fields.SelectMany(s => s).Select(f => new KeyValuePair <IFieldSymbol, bool>(f, true)));
await Task.WhenAll(
allDocuments.AsParallel()
.Select(
doc => WriteUsagesScanner.RemoveWrittenFields(
doc,
writableFields,
cancellationToken)));
m_unwrittenWritableFields = writableFields;
}
}
}
if (m_unwrittenWritableFields.Count == 0)
{
// If there are no unwritten writable fields, skip all the rewriting
return(document.Project.Solution);
}
SyntaxNode root = await document.GetSyntaxRootAsync(cancellationToken);
var application = new ReadonlyRewriter(
m_unwrittenWritableFields,
await document.GetSemanticModelAsync(cancellationToken));
return(document.Project.Solution.WithDocumentSyntaxRoot(document.Id, application.Visit(root)));
}
public static async Task RemoveWrittenFields(
Document document,
ConcurrentDictionary <IFieldSymbol, bool> writableFields,
CancellationToken cancellationToken)
{
var scanner = new WriteUsagesScanner(
await document.GetSemanticModelAsync(cancellationToken),
writableFields);
scanner.Visit(await document.GetSyntaxRootAsync(cancellationToken));
}
public static async Task RemoveWrittenFields(
Document document,
ConcurrentDictionary <IFieldSymbol, bool> writableFields,
CancellationToken cancellationToken)
{
if (document.Project.Language != LanguageNames.CSharp)
{
return;
}
var scanner = new WriteUsagesScanner(
await document.GetSemanticModelAsync(cancellationToken),
writableFields);
scanner.Visit(await document.GetSyntaxRootAsync(cancellationToken));
}
public static async Task RemoveWrittenFields(
Document document,
ConcurrentDictionary<IFieldSymbol, bool> writableFields,
CancellationToken cancellationToken)
{
var scanner = new WriteUsagesScanner(
await document.GetSemanticModelAsync(cancellationToken),
writableFields);
scanner.Visit(await document.GetSyntaxRootAsync(cancellationToken));
}