public GherkinFileEditorParserListener(ITextSnapshot textSnapshot, GherkinFileEditorClassifications classifications, GherkinFileEditorInfo previousGherkinFileEditorInfo, int changeLastLine, int changeLineDelta)
{
this.textSnapshot = textSnapshot;
this.changeLineDelta = changeLineDelta;
this.changeLastLine = changeLastLine;
this.classifications = classifications;
this.previousGherkinFileEditorInfo = previousGherkinFileEditorInfo;
gherkinFileEditorInfo = new GherkinFileEditorInfo();
}
public GherkinFileEditorParserListener(ITextSnapshot textSnapshot, GherkinFileEditorClassifications classifications, GherkinFileEditorInfo previousGherkinFileEditorInfo, int lineOffset, int changeLastLine, int changeLineDelta)
{
this.textSnapshot = textSnapshot;
this.changeLineDelta = changeLineDelta;
this.changeLastLine = changeLastLine;
this.lineOffset = lineOffset;
this.classifications = classifications;
this.previousGherkinFileEditorInfo = previousGherkinFileEditorInfo;
gherkinFileEditorInfo = new GherkinFileEditorInfo();
beforeFeature = !isPartialParsing;
}
private void TriggerChanges(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo, ScenarioEditorInfo firstAffectedScenario = null, ScenarioEditorInfo firstUnchangedScenario = null)
{
this.GherkinFileEditorInfo = gherkinFileEditorInfo;
var textSnapshot = changeInfo.TextSnapshot;
int startPosition = 0;
if (firstAffectedScenario != null)
startPosition = textSnapshot.GetLineFromLineNumber(firstAffectedScenario.StartLine).Start;
int endPosition = textSnapshot.Length;
if (firstUnchangedScenario != null)
endPosition = textSnapshot.GetLineFromLineNumber(firstUnchangedScenario.StartLine).Start;
var snapshotSpan = new SnapshotSpan(textSnapshot, startPosition, endPosition - startPosition);
if (ClassificationChanged != null)
{
ClassificationChanged(this, new ClassificationChangedEventArgs(snapshotSpan));
}
if (TagsChanged != null)
{
TagsChanged(this, new SnapshotSpanEventArgs(snapshotSpan));
}
}
private void PartialParse(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo, ScenarioEditorInfo firstAffectedScenario)
{
int parseStartPosition =
changeInfo.TextSnapshot.GetLineFromLineNumber(firstAffectedScenario.StartLine).Start;
string fileContent = changeInfo.TextSnapshot.GetText(parseStartPosition, changeInfo.TextSnapshot.Length - parseStartPosition);
string fileHeader = changeInfo.TextSnapshot.GetText(0, parseStartPosition);
I18n languageService = GetLanguageService(fileHeader);
ScenarioEditorInfo firstUnchangedScenario;
var partialResult = DoParsePartial(fileContent, languageService,
firstAffectedScenario.StartLine,
out firstUnchangedScenario,
changeInfo.TextSnapshot,
gherkinFileEditorInfo,
changeInfo.ChangeLastLine,
changeInfo.LineCountDelta);
if (partialResult.HeaderClassificationSpans.Any())
{
//TODO: merge to the prev scenario?
partialResult.HeaderClassificationSpans.Clear();
}
partialResult.HeaderClassificationSpans.AddRange(
gherkinFileEditorInfo.HeaderClassificationSpans
.Select(cs => cs.Shift(changeInfo.TextSnapshot, 0)));
// inserting the non-affected scenarios
partialResult.ScenarioEditorInfos.InsertRange(0,
gherkinFileEditorInfo.ScenarioEditorInfos.TakeUntilItemExclusive(firstAffectedScenario)
.Select(senario => senario.Shift(changeInfo.TextSnapshot, 0, 0)));
if (firstUnchangedScenario != null)
{
// inserting the non-effected scenarios at the end
partialResult.ScenarioEditorInfos.AddRange(
gherkinFileEditorInfo.ScenarioEditorInfos.SkipFromItemInclusive(firstUnchangedScenario)
.Select(
scenario =>
scenario.Shift(changeInfo.TextSnapshot, changeInfo.LineCountDelta, changeInfo.PositionDelta)));
}
TriggerChanges(partialResult, changeInfo, firstAffectedScenario, firstUnchangedScenario);
}
private void ParseAndTriggerChanges(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo)
{
if (gherkinFileEditorInfo == null)
{
// initial parsing
FullParse(changeInfo);
return;
}
// incremental parsing
var firstAffectedScenario = gherkinFileEditorInfo.ScenarioEditorInfos.LastOrDefault(
s => s.StartLine <= changeInfo.ChangeFirstLine);
if (firstAffectedScenario == null)
{
FullParse(changeInfo);
return;
}
PartialParse(gherkinFileEditorInfo, changeInfo, firstAffectedScenario);
}
private GherkinFileEditorInfo DoParsePartial(string fileContent, I18n languageService, int lineOffset, out ScenarioEditorInfo firstUnchangedScenario, ITextSnapshot textSnapshot, GherkinFileEditorInfo previousGherkinFileEditorInfo, int changeLastLine, int changeLineDelta)
{
var gherkinListener = new GherkinFileEditorParserListener(textSnapshot, classifications, previousGherkinFileEditorInfo, lineOffset, changeLastLine, changeLineDelta);
return DoScan(fileContent, textSnapshot, lineOffset, languageService, gherkinListener, 0, out firstUnchangedScenario);
}
private GherkinFileEditorInfo DoParsePartial(string fileContent, I18n languageService, int lineOffset, out ScenarioEditorInfo firstUnchangedScenario, ITextSnapshot textSnapshot, GherkinFileEditorInfo previousGherkinFileEditorInfo, int changeLastLine, int changeLineDelta)
{
GherkinScanner scanner = new GherkinScanner(languageService, fileContent, lineOffset);
var gherkinListener = new GherkinFileEditorParserListener(textSnapshot, classifications, previousGherkinFileEditorInfo, changeLastLine, changeLineDelta);
firstUnchangedScenario = null;
try
{
scanner.Scan(gherkinListener);
}
catch (PartialListeningDoneException partialListeningDoneException)
{
firstUnchangedScenario = partialListeningDoneException.FirstUnchangedScenario;
}
return gherkinListener.GetResult();
}
private void ParseAndTriggerChanges(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo)
{
if (gherkinFileEditorInfo == null)
{
// initial parsing
FullParse(changeInfo);
return;
}
if (partialParseCount >= PartialParseCountLimit)
{
visualStudioTracer.Trace("Forced full parse after " + partialParseCount + " incremental parse", ParserTraceCategory);
FullParse(changeInfo);
return;
}
// incremental parsing
var firstAffectedScenario = gherkinFileEditorInfo.ScenarioEditorInfos.LastOrDefault(
s => s.StartLine <= changeInfo.ChangeFirstLine);
if (firstAffectedScenario == null)
{
// We would not need to do a full parse when the header chenges, but it would
// be too complicated to bring this case through the logic now.
// So the side-effect is that we do a full parse when the header changes instead of an incremental.
FullParse(changeInfo);
return;
}
PartialParse(gherkinFileEditorInfo, changeInfo, firstAffectedScenario);
}
private void TriggerChanges(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo, ScenarioEditorInfo firstAffectedScenario = null, ScenarioEditorInfo firstUnchangedScenario = null)
{
this.GherkinFileEditorInfo = gherkinFileEditorInfo;
var textSnapshot = changeInfo.TextSnapshot;
int startPosition = 0;
if (firstAffectedScenario != null)
startPosition = textSnapshot.GetLineFromLineNumber(firstAffectedScenario.StartLine).Start;
int endPosition = textSnapshot.Length;
if (firstUnchangedScenario != null)
endPosition = textSnapshot.GetLineFromLineNumber(firstUnchangedScenario.StartLine).Start;
// safety criteria to avoid argument execption in case of a wrong parser result
if (startPosition >= endPosition)
return;
var snapshotSpan = new SnapshotSpan(textSnapshot, startPosition, endPosition - startPosition);
if (ClassificationChanged != null)
{
ClassificationChanged(this, new ClassificationChangedEventArgs(snapshotSpan));
}
if (TagsChanged != null)
{
TagsChanged(this, new SnapshotSpanEventArgs(snapshotSpan));
}
}
private void PartialParse(GherkinFileEditorInfo gherkinFileEditorInfo, ChangeInfo changeInfo, ScenarioEditorInfo firstAffectedScenario)
{
visualStudioTracer.Trace("Start incremental parsing", ParserTraceCategory);
Stopwatch stopwatch = new Stopwatch();
stopwatch.Start();
partialParseCount++;
int parseStartPosition =
changeInfo.TextSnapshot.GetLineFromLineNumber(firstAffectedScenario.StartLine).Start;
string fileContent = changeInfo.TextSnapshot.GetText(parseStartPosition, changeInfo.TextSnapshot.Length - parseStartPosition);
string fileHeader = changeInfo.TextSnapshot.GetText(0, parseStartPosition);
I18n languageService = GetLanguageService(fileHeader);
ScenarioEditorInfo firstUnchangedScenario;
var partialResult = DoParsePartial(fileContent, languageService,
firstAffectedScenario.StartLine,
out firstUnchangedScenario,
changeInfo.TextSnapshot,
gherkinFileEditorInfo,
changeInfo.ChangeLastLine,
changeInfo.LineCountDelta);
if (partialResult.HeaderClassificationSpans.Any())
{
//TODO: merge to the prev scenario?
partialResult.HeaderClassificationSpans.Clear();
}
partialResult.HeaderClassificationSpans.AddRange(
gherkinFileEditorInfo.HeaderClassificationSpans
.Select(cs => cs.Shift(changeInfo.TextSnapshot, 0)));
// inserting the non-affected scenarios
partialResult.ScenarioEditorInfos.InsertRange(0,
gherkinFileEditorInfo.ScenarioEditorInfos.TakeUntilItemExclusive(firstAffectedScenario)
.Select(senario => senario.Shift(changeInfo.TextSnapshot, 0, 0)));
ScenarioEditorInfo firstUnchangedScenarioShifted = null;
if (firstUnchangedScenario != null)
{
// inserting the non-effected scenarios at the end
int firstNewScenarioIndex = partialResult.ScenarioEditorInfos.Count;
partialResult.ScenarioEditorInfos.AddRange(
gherkinFileEditorInfo.ScenarioEditorInfos.SkipFromItemInclusive(firstUnchangedScenario)
.Select(
scenario =>
scenario.Shift(changeInfo.TextSnapshot, changeInfo.LineCountDelta, changeInfo.PositionDelta)));
firstUnchangedScenarioShifted = partialResult.ScenarioEditorInfos.Count > firstNewScenarioIndex
? partialResult.ScenarioEditorInfos[firstNewScenarioIndex]
: null;
}
TriggerChanges(partialResult, changeInfo, firstAffectedScenario, firstUnchangedScenarioShifted);
stopwatch.Stop();
TraceFinishParse(stopwatch, "incremental");
}