public async Task <LSP.SemanticTokens> HandleRequestAsync(
LSP.SemanticTokensParams request,
RequestContext context,
CancellationToken cancellationToken)
{
Contract.ThrowIfNull(request.TextDocument, "TextDocument is null.");
Contract.ThrowIfNull(context.Document, "Document is null.");
var resultId = _tokensCache.GetNextResultId();
var(tokensData, isFinalized) = await SemanticTokensHelpers.ComputeSemanticTokensDataAsync(
context.Document, SemanticTokensCache.TokenTypeToIndex,
range : null, cancellationToken).ConfigureAwait(false);
var tokens = new RoslynSemanticTokens {
ResultId = resultId, Data = tokensData, IsFinalized = isFinalized
};
if (tokensData.Length > 0)
{
await _tokensCache.UpdateCacheAsync(request.TextDocument.Uri, tokens, cancellationToken).ConfigureAwait(false);
}
return(tokens);
}
public async Task <SumType <LSP.SemanticTokens, LSP.SemanticTokensDelta> > HandleRequestAsync(
LSP.SemanticTokensDeltaParams request,
RequestContext context,
CancellationToken cancellationToken)
{
Contract.ThrowIfNull(request.TextDocument, "TextDocument is null.");
Contract.ThrowIfNull(request.PreviousResultId, "previousResultId is null.");
Contract.ThrowIfNull(context.Document, "Document is null.");
// Even though we want to ultimately pass edits back to LSP, we still need to compute all semantic tokens,
// both for caching purposes and in order to have a baseline comparison when computing the edits.
var(newSemanticTokensData, isFinalized) = await SemanticTokensHelpers.ComputeSemanticTokensDataAsync(
context.Document, SemanticTokensCache.TokenTypeToIndex,
range : null, cancellationToken).ConfigureAwait(false);
Contract.ThrowIfNull(newSemanticTokensData, "newSemanticTokensData is null.");
// Getting the cached tokens for the document. If we don't have an applicable cached token set,
// we can't calculate edits, so we must return all semantic tokens instead. Likewise, if the new
// token set is empty, there's no need to calculate edits.
var oldSemanticTokensData = await _tokensCache.GetCachedTokensDataAsync(
request.TextDocument.Uri, request.PreviousResultId, cancellationToken).ConfigureAwait(false);
if (oldSemanticTokensData == null || newSemanticTokensData.Length == 0)
{
var newResultId = _tokensCache.GetNextResultId();
var updatedTokens = new RoslynSemanticTokens
{
ResultId = newResultId,
Data = newSemanticTokensData,
IsFinalized = isFinalized,
};
if (newSemanticTokensData.Length > 0)
{
await _tokensCache.UpdateCacheAsync(
request.TextDocument.Uri, updatedTokens, cancellationToken).ConfigureAwait(false);
}
return(updatedTokens);
}
var editArray = await ComputeSemanticTokensEditsAsync(oldSemanticTokensData, newSemanticTokensData).ConfigureAwait(false);
var resultId = request.PreviousResultId;
// If we have edits, generate a new ResultId. Otherwise, re-use the previous one.
if (editArray.Length != 0)
{
resultId = _tokensCache.GetNextResultId();
var updatedTokens = new RoslynSemanticTokens
{
ResultId = resultId,
Data = newSemanticTokensData,
IsFinalized = isFinalized
};
await _tokensCache.UpdateCacheAsync(
request.TextDocument.Uri, updatedTokens, cancellationToken).ConfigureAwait(false);
}
var edits = new RoslynSemanticTokensDelta
{
ResultId = resultId,
Edits = editArray,
IsFinalized = isFinalized
};
return(edits);
}