private GherkinFileScopeChange PartialParse(GherkinTextBufferChange change, IGherkinFileScope previousScope)
{
_visualStudioTracer.Trace("Start incremental parsing", ParserTraceCategory);
var stopwatch = new Stopwatch();
stopwatch.Start();
_partialParseCount++;
var textSnapshot = change.ResultTextSnapshot;
var firstAffectedScenario = GetFirstAffectedScenario(change, previousScope);
Asserter.Assert(firstAffectedScenario != null, "first affected scenario is null");
int parseStartPosition = textSnapshot.GetLineFromLineNumber(firstAffectedScenario.GetStartLine()).Start;
string fileContent = textSnapshot.GetText(parseStartPosition, textSnapshot.Length - parseStartPosition);
var gherkinListener = new GherkinTextBufferPartialParserListener(
previousScope.GherkinDialect,
textSnapshot, _projectScope,
previousScope,
change.EndLine, change.LineCountDelta);
var scanner = new GherkinScanner(previousScope.GherkinDialect, fileContent, firstAffectedScenario.GetStartLine());
IScenarioBlock firstUnchangedScenario = null;
try
{
scanner.Scan(gherkinListener);
}
catch (PartialListeningDoneException partialListeningDoneException)
{
firstUnchangedScenario = partialListeningDoneException.FirstUnchangedScenario;
}
var partialResult = gherkinListener.GetResult();
var result = MergePartialResult(previousScope, partialResult, firstAffectedScenario, firstUnchangedScenario, change.LineCountDelta);
stopwatch.Stop();
TraceFinishParse(stopwatch, "incremental", result);
return(result);
}
public static GherkinTextBufferChange Merge(GherkinTextBufferChange change1, GherkinTextBufferChange change2)
{
Asserter.Assert(change1.ResultTextSnapshot.Version.VersionNumber <= change2.ResultTextSnapshot.Version.VersionNumber, "different snapshot version numbers for merging");
if (change1.Type == GherkinTextBufferChangeType.EntireFile || change2.Type == GherkinTextBufferChangeType.EntireFile)
{
return(CreateEntireBufferChange(change2.ResultTextSnapshot));
}
return(new GherkinTextBufferChange(
change1.Type == GherkinTextBufferChangeType.MultiLine || change2.Type == GherkinTextBufferChangeType.MultiLine ? GherkinTextBufferChangeType.MultiLine : GherkinTextBufferChangeType.SingleLine,
Math.Min(change1.StartLine, change2.StartLine),
Math.Max(change1.EndLine, change2.EndLine),
Math.Min(change1.StartPosition, change2.StartPosition),
Math.Max(change1.EndPosition, change2.EndPosition),
change1.LineCountDelta + change2.LineCountDelta,
change1.PositionDelta + change2.PositionDelta,
change2.ResultTextSnapshot));
}
public ParsingTask(GherkinLanguageService languageService, GherkinTextBufferChange change)
{
this.languageService = languageService;
this.change = change;
}