public IChameleonNode ReSync(CachingLexer cachingLexer, TreeTextRange changedRange, int insertedTextLen)
{
var currentStartOffset = GetTreeStartOffset();
var currentLength = GetTextLength();
Assertion.Assert(
changedRange.StartOffset >= currentStartOffset && changedRange.EndOffset <= currentStartOffset + currentLength,
"changedRange.StartOffset >= currentStartOffset && changedRange.EndOffset <= (currentStartOffset+currentLength)");
var newLength = currentLength - changedRange.Length + insertedTextLen;
// Can we resync from the start point?
if (!cachingLexer.FindTokenAt(currentStartOffset.Offset) ||
cachingLexer.TokenStart != currentStartOffset.Offset ||
!IsAtValidStartToken(cachingLexer))
{
return(null);
}
// Try to find a valid end point
TokenNodeType tokenType;
var calculatedNewLength = 0;
while ((tokenType = cachingLexer.TokenType) != null &&
(calculatedNewLength += cachingLexer.TokenEnd - cachingLexer.TokenStart) < newLength)
{
// We shouldn't encounter these until the end of the changed range
if (tokenType == YamlTokenType.DOCUMENT_END || tokenType == YamlTokenType.DIRECTIVES_END)
{
return(null);
}
cachingLexer.Advance();
}
if (calculatedNewLength != newLength || !IsAtValidEndToken(cachingLexer))
{
return(null);
}
// TODO: Should this be synchronised?
// The C# implementation isn't...
if (!myOpened)
{
var buffer = ProjectedBuffer.Create(cachingLexer.Buffer,
new TextRange(currentStartOffset.Offset, currentStartOffset.Offset + newLength));
var closedChameleon = new ClosedChameleonElement(YamlTokenType.CHAMELEON, buffer, TreeOffset.Zero,
new TreeOffset(buffer.Length));
return(new ChameleonDocumentBody(closedChameleon));
}
var projectedLexer = new ProjectedLexer(cachingLexer, new TextRange(currentStartOffset.Offset, currentStartOffset.Offset + newLength));
var parser =
(IYamlParser)Language.LanguageService().CreateParser(projectedLexer, GetPsiModule(), GetSourceFile());
var openedChameleon = parser.ParseDocumentBody();
return(new ChameleonDocumentBody(openedChameleon));
}
public UnityYamlChameleonDocument(ClosedChameleonElement closedChameleonElement)
{
AppendNewChild(closedChameleonElement);
}
// Used by Resync to create a closed chameleon
private ChameleonDocumentBody(ClosedChameleonElement closedChameleonElement)
{
AppendNewChild(closedChameleonElement);
}
