private static SyntaxNode GetChangedMember(
ISyntaxFactsService syntaxFactsService, SyntaxNode oldRoot, SyntaxNode newRoot, TextChangeRange range)
{
// if either old or new tree contains skipped text, re-analyze whole document
if (oldRoot.ContainsSkippedText || newRoot.ContainsSkippedText)
{
return(null);
}
var oldMember = syntaxFactsService.GetContainingMemberDeclaration(oldRoot, range.Span.Start);
var newMember = syntaxFactsService.GetContainingMemberDeclaration(newRoot, range.Span.Start);
// reached the top (compilation unit)
if (oldMember == null || newMember == null)
{
return(null);
}
// member doesn't contain the change
if (!syntaxFactsService.ContainsInMemberBody(oldMember, range.Span))
{
return(null);
}
// member sigature has changed
if (!oldMember.IsEquivalentTo(newMember, topLevel: true))
{
return(null);
}
// looks like inside of the body has changed
return(newMember);
}
private static SyntaxNode GetChangedMember(
ISyntaxFactsService syntaxFactsService, SyntaxNode oldRoot, SyntaxNode newRoot, TextChangeRange range)
{
// if either old or new tree contains skipped text, re-analyze whole document
if (oldRoot.ContainsSkippedText || newRoot.ContainsSkippedText)
{
return null;
}
var oldMember = syntaxFactsService.GetContainingMemberDeclaration(oldRoot, range.Span.Start);
var newMember = syntaxFactsService.GetContainingMemberDeclaration(newRoot, range.Span.Start);
// reached the top (compilation unit)
if (oldMember == null || newMember == null)
{
return null;
}
// member doesn't contain the change
if (!syntaxFactsService.ContainsInMemberBody(oldMember, range.Span))
{
return null;
}
// member signature has changed
if (!oldMember.IsEquivalentTo(newMember, topLevel: true))
{
return null;
}
// looks like inside of the body has changed
return newMember;
}