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?GetBestGuessChangedMember(
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);
}
// there was top level changes, so we can't use equivalent to see whether two members are same.
// so, we use some simple text based heuristic to find a member that has changed.
//
// if we have a differ that do diff on member level or a way to track member between incremental parsing, then
// that would be preferable. but currently we don't have such thing.
// get top level elements at the position where change has happened
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);
}
// if old member was empty, just use new member
if (oldMember.Span.IsEmpty)
{
return(newMember);
}
// looks like change doesn't belong to existing member
if (!oldMember.Span.Contains(range.Span))
{
return(null);
}
// change happened inside of the old member, check whether new member seems just delta of that change
var lengthDelta = range.NewLength - range.Span.Length;
return((oldMember.Span.Length + lengthDelta) == newMember.Span.Length
? newMember
: null);
}
private IEnumerable <IGrouping <SyntaxNode, Diagnostic> > GetDiagnosticsGroupedByMember(
ImmutableArray <Diagnostic> diagnostics,
ISyntaxFactsService syntaxFacts,
SyntaxNode root)
=> diagnostics.GroupBy(d => syntaxFacts.GetContainingMemberDeclaration(root, d.Location.SourceSpan.Start));
private static SyntaxNode GetBestGuessChangedMember(
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;
}
// there was top level changes, so we can't use equivalent to see whether two members are same.
// so, we use some simple text based heuristic to find a member that has changed.
//
// if we have a differ that do diff on member level or a way to track member between incremental parsing, then
// that would be preferable. but currently we don't have such thing.
// get top level elements at the position where change has happened
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;
}
// if old member was empty, just use new member
if (oldMember.Span.IsEmpty)
{
return newMember;
}
// looks like change doesn't belong to existing member
if (!oldMember.Span.Contains(range.Span))
{
return null;
}
// change happened inside of the old member, check whether new member seems just delta of that change
var lengthDelta = range.NewLength - range.Span.Length;
return (oldMember.Span.Length + lengthDelta) == newMember.Span.Length ? newMember : null;
}
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;
}
