// The method which performs rename, resolves the conflict locations and returns the result of the rename operation
public async Task <ConflictResolution> ResolveConflictsAsync()
{
try
{
await FindDocumentsAndPossibleNameConflicts().ConfigureAwait(false);
var baseSolution = _renameLocationSet.Solution;
// Process rename one project at a time to improve caching and reduce syntax tree serialization.
var documentsGroupedByTopologicallySortedProjectId = _documentsIdsToBeCheckedForConflict
.GroupBy(d => d.ProjectId)
.OrderBy(g => _topologicallySortedProjects.IndexOf(g.Key));
_replacementTextValid = IsIdentifierValid_Worker(baseSolution, _replacementText, documentsGroupedByTopologicallySortedProjectId.Select(g => g.Key), _cancellationToken);
var renamedSpansTracker = new RenamedSpansTracker();
var conflictResolution = new ConflictResolution(baseSolution, renamedSpansTracker, _replacementText, _replacementTextValid);
foreach (var documentsByProject in documentsGroupedByTopologicallySortedProjectId)
{
var documentIdsThatGetsAnnotatedAndRenamed = new HashSet <DocumentId>(documentsByProject);
using (baseSolution.Services.CacheService?.EnableCaching(documentsByProject.Key))
{
// Rename is going to be in 4 phases.
// 1st phase - Does a simple token replacement
// If the 1st phase results in conflict then we perform then:
// 2nd phase is to expand and simplify only the reference locations with conflicts
// 3rd phase is to expand and simplify all the conflict locations (both reference and non-reference)
// If there are unresolved Conflicts after the 3rd phase then in 4th phase,
// We complexify and resolve locations that were resolvable and for the other locations we perform the normal token replacement like the first the phase.
for (int phase = 0; phase < 4; phase++)
{
// Step 1:
// The rename process and annotation for the bookkeeping is performed in one-step
// The Process in short is,
// 1. If renaming a token which is no conflict then replace the token and make a map of the oldspan to the newspan
// 2. If we encounter a node that has to be expanded( because there was a conflict in previous phase), we expand it.
// If the node happens to contain a token that needs to be renamed then we annotate it and rename it after expansion else just expand and proceed
// 3. Through the whole process we maintain a map of the oldspan to newspan. In case of expansion & rename, we map the expanded node and the renamed token
conflictResolution.UpdateCurrentSolution(await AnnotateAndRename_WorkerAsync(
baseSolution,
conflictResolution.NewSolution,
documentIdsThatGetsAnnotatedAndRenamed,
_renameLocationSet.Locations,
renamedSpansTracker,
_replacementTextValid).ConfigureAwait(false));
// Step 2: Check for conflicts in the renamed solution
bool foundResolvableConflicts = await IdentifyConflictsAsync(
documentIdsForConflictResolution : documentIdsThatGetsAnnotatedAndRenamed,
allDocumentIdsInProject : documentsByProject,
projectId : documentsByProject.Key,
conflictResolution : conflictResolution).ConfigureAwait(false);
if (!foundResolvableConflicts || phase == 3)
{
break;
}
if (phase == 0)
{
_conflictLocations = conflictResolution.RelatedLocations
.Where(loc => (documentIdsThatGetsAnnotatedAndRenamed.Contains(loc.DocumentId) && loc.Type == RelatedLocationType.PossiblyResolvableConflict && loc.IsReference))
.Select(loc => new ConflictLocationInfo(loc))
.ToSet();
// If there were no conflicting locations in references, then the first conflict phase has to be skipped.
if (_conflictLocations.Count == 0)
{
phase++;
}
}
if (phase == 1)
{
_conflictLocations = _conflictLocations.Concat(conflictResolution.RelatedLocations
.Where(loc => documentIdsThatGetsAnnotatedAndRenamed.Contains(loc.DocumentId) && loc.Type == RelatedLocationType.PossiblyResolvableConflict)
.Select(loc => new ConflictLocationInfo(loc)))
.ToSet();
}
// Set the documents with conflicts that need to be processed in the next phase.
// Note that we need to get the conflictLocations here since we're going to remove some locations below if phase == 2
documentIdsThatGetsAnnotatedAndRenamed = new HashSet <DocumentId>(_conflictLocations.Select(l => l.DocumentId));
if (phase == 2)
{
// After phase 2, if there are still conflicts then remove the conflict locations from being expanded
var unresolvedLocations = conflictResolution.RelatedLocations
.Where(l => (l.Type & RelatedLocationType.UnresolvedConflict) != 0)
.Select(l => Tuple.Create(l.ComplexifiedTargetSpan, l.DocumentId)).Distinct();
_conflictLocations = _conflictLocations.Where(l => !unresolvedLocations.Any(c => c.Item2 == l.DocumentId && c.Item1.Contains(l.OriginalIdentifierSpan))).ToSet();
}
// Clean up side effects from rename before entering the next phase
conflictResolution.ClearDocuments(documentIdsThatGetsAnnotatedAndRenamed);
}
// Step 3: Simplify the project
conflictResolution.UpdateCurrentSolution(await renamedSpansTracker.SimplifyAsync(conflictResolution.NewSolution, documentsByProject, _replacementTextValid, _renameAnnotations, _cancellationToken).ConfigureAwait(false));
await conflictResolution.RemoveAllRenameAnnotationsAsync(documentsByProject, _renameAnnotations, _cancellationToken).ConfigureAwait(false);
}
}
// This rename could break implicit references of this symbol (e.g. rename MoveNext on a collection like type in a
// foreach/for each statement
ISymbol renamedSymbolInNewSolution = await GetRenamedSymbolInCurrentSolutionAsync(conflictResolution).ConfigureAwait(false);
if (IsRenameValid(conflictResolution, renamedSymbolInNewSolution))
{
await AddImplicitConflictsAsync(
renamedSymbolInNewSolution,
_renameLocationSet.Symbol,
_renameLocationSet.ImplicitLocations,
await conflictResolution.NewSolution.GetDocument(_documentIdOfRenameSymbolDeclaration).GetSemanticModelAsync(_cancellationToken).ConfigureAwait(false),
_renameSymbolDeclarationLocation,
renamedSpansTracker.GetAdjustedPosition(_renameSymbolDeclarationLocation.SourceSpan.Start, _documentIdOfRenameSymbolDeclaration),
conflictResolution,
_cancellationToken).ConfigureAwait(false);
}
foreach (var relatedLocation in conflictResolution.RelatedLocations)
{
if (relatedLocation.Type == RelatedLocationType.PossiblyResolvableConflict)
{
relatedLocation.Type = RelatedLocationType.UnresolvedConflict;
}
}
#if DEBUG
await DebugVerifyNoErrorsAsync(conflictResolution, _documentsIdsToBeCheckedForConflict).ConfigureAwait(false);
#endif
return(conflictResolution);
}
catch (Exception e) when(FatalError.ReportUnlessCanceled(e))
{
throw ExceptionUtilities.Unreachable;
}
}
public int GetAdjustedTokenStartingPosition(
int startingPosition,
DocumentId documentId)
{
return(_renamedSpansTracker.GetAdjustedPosition(startingPosition, documentId));
}