private static IEnumerable <SyntaxTrivia> ResolveTrivia(
TriviaLocation location,
PreviousNextTokenPair tokenPair,
Dictionary <SyntaxToken, LeadingTrailingTriviaPair> triviaMap
)
{
var previousTriviaPair = triviaMap.ContainsKey(tokenPair.PreviousToken)
? triviaMap[tokenPair.PreviousToken]
: default;
var nextTriviaPair = triviaMap.ContainsKey(tokenPair.NextToken)
? triviaMap[tokenPair.NextToken]
: default;
var trailingTrivia =
previousTriviaPair.TrailingTrivia
?? SpecializedCollections.EmptyEnumerable <SyntaxTrivia>();
var leadingTrivia =
nextTriviaPair.LeadingTrivia
?? SpecializedCollections.EmptyEnumerable <SyntaxTrivia>();
return(tokenPair.PreviousToken.TrailingTrivia
.Concat(trailingTrivia)
.Concat(leadingTrivia)
.Concat(tokenPair.NextToken.LeadingTrivia));
}
private LeadingTrailingTriviaPair GetTrailingAndLeadingTrivia(TriviaLocation locationKind, PreviousNextTokenPair tokenPair, IEnumerable<SyntaxTrivia> trivia)
{
var list = trivia.ToList();
// there are some noisy trivia
var index = GetFirstEndOfLineIndex(list);
return new LeadingTrailingTriviaPair
{
TrailingTrivia = CreateTriviaListFromTo(list, 0, index),
LeadingTrivia = CreateTriviaListFromTo(list, index + 1, list.Count - 1)
};
}
private LeadingTrailingTriviaPair CreateTriviaPairs(
PreviousNextTokenPair tokenPair,
IEnumerable <SyntaxTrivia> trivia)
{
// beginning of the tree
if (tokenPair.PreviousToken.RawKind == 0)
{
return(new LeadingTrailingTriviaPair {
TrailingTrivia = SpecializedCollections.EmptyEnumerable <SyntaxTrivia>(), LeadingTrivia = trivia
});
}
return(GetTrailingAndLeadingTrivia(trivia));
}
private IEnumerable<SyntaxTrivia> TriviaResolver(
TriviaLocation location,
PreviousNextTokenPair tokenPair,
Dictionary<SyntaxToken, LeadingTrailingTriviaPair> triviaMap,
MethodDeclarationSyntax method)
{
// Resolve trivia at the edge of the selection. simple case is easy to deal with, but complex cases where
// elastic trivia and user trivia are mixed (hybrid case) and we want to preserve some part of user coding style
// but not others can be dealt with here.
// method has no statement in them. so basically two trivia list now pointing to same thing. "{" and "}"
if (tokenPair.PreviousToken == method.Body.OpenBraceToken &&
tokenPair.NextToken == method.Body.CloseBraceToken)
{
return (location == TriviaLocation.AfterBeginningOfSpan) ?
SpecializedCollections.SingletonEnumerable<SyntaxTrivia>(SyntaxFactory.ElasticMarker) :
SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
}
var previousTriviaPair = triviaMap.ContainsKey(tokenPair.PreviousToken) ? triviaMap[tokenPair.PreviousToken] : default(LeadingTrailingTriviaPair);
var nextTriviaPair = triviaMap.ContainsKey(tokenPair.NextToken) ? triviaMap[tokenPair.NextToken] : default(LeadingTrailingTriviaPair);
var trailingTrivia = previousTriviaPair.TrailingTrivia ?? SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
var leadingTrivia = nextTriviaPair.LeadingTrivia ?? SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
var list = trailingTrivia.Concat(leadingTrivia);
switch (location)
{
case TriviaLocation.BeforeBeginningOfSpan:
return FilterBeforeBeginningOfSpan(tokenPair, list);
case TriviaLocation.AfterEndOfSpan:
return FilterTriviaList(list.Concat(tokenPair.NextToken.LeadingTrivia));
case TriviaLocation.AfterBeginningOfSpan:
return FilterTriviaList(AppendTrailingTrivia(tokenPair).Concat(list).Concat(tokenPair.NextToken.LeadingTrivia));
case TriviaLocation.BeforeEndOfSpan:
return FilterTriviaList(tokenPair.PreviousToken.TrailingTrivia.Concat(list).Concat(tokenPair.NextToken.LeadingTrivia));
}
return Contract.FailWithReturn<IEnumerable<SyntaxTrivia>>("Shouldn't reach here");
}
private static IEnumerable<SyntaxTrivia> ResolveTrivia(
TriviaLocation location,
PreviousNextTokenPair tokenPair,
Dictionary<SyntaxToken, LeadingTrailingTriviaPair> triviaMap)
{
var previousTriviaPair = triviaMap.ContainsKey(tokenPair.PreviousToken) ? triviaMap[tokenPair.PreviousToken] : default(LeadingTrailingTriviaPair);
var nextTriviaPair = triviaMap.ContainsKey(tokenPair.NextToken) ? triviaMap[tokenPair.NextToken] : default(LeadingTrailingTriviaPair);
var trailingTrivia = previousTriviaPair.TrailingTrivia ?? SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
var leadingTrivia = nextTriviaPair.LeadingTrivia ?? SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
return tokenPair.PreviousToken.TrailingTrivia.Concat(trailingTrivia).Concat(leadingTrivia).Concat(tokenPair.NextToken.LeadingTrivia);
}
private LeadingTrailingTriviaPair CreateTriviaPairs(
TriviaLocation locationKind,
PreviousNextTokenPair tokenPair,
IEnumerable<SyntaxTrivia> trivia)
{
// beginning of the tree
if (tokenPair.PreviousToken.RawKind == 0)
{
return new LeadingTrailingTriviaPair { TrailingTrivia = SpecializedCollections.EmptyEnumerable<SyntaxTrivia>(), LeadingTrivia = trivia };
}
return GetTrailingAndLeadingTrivia(locationKind, tokenPair, trivia);
}
private IEnumerable<SyntaxTrivia> AppendTrailingTrivia(PreviousNextTokenPair tokenPair)
{
if (tokenPair.PreviousToken.RawKind == (int)SyntaxKind.OpenBraceToken ||
tokenPair.PreviousToken.RawKind == (int)SyntaxKind.SemicolonToken)
{
return tokenPair.PreviousToken.TrailingTrivia;
}
return SpecializedCollections.EmptyEnumerable<SyntaxTrivia>();
}
private IEnumerable<SyntaxTrivia> FilterBeforeBeginningOfSpan(PreviousNextTokenPair tokenPair, IEnumerable<SyntaxTrivia> list)
{
var allList = FilterTriviaList(tokenPair.PreviousToken.TrailingTrivia.Concat(list).Concat(AppendLeadingTrivia(tokenPair)));
if (tokenPair.PreviousToken.RawKind == (int)SyntaxKind.OpenBraceToken)
{
return RemoveBlankLines(allList);
}
return allList;
}
private LeadingTrailingTriviaPair GetTrailingAndLeadingTrivia(TriviaLocation locationKind, PreviousNextTokenPair tokenPair, IEnumerable <SyntaxTrivia> trivia)
{
var list = trivia.ToList();
// there are some noisy trivia
var index = GetFirstEndOfLineIndex(list);
return(new LeadingTrailingTriviaPair
{
TrailingTrivia = CreateTriviaListFromTo(list, 0, index),
LeadingTrivia = CreateTriviaListFromTo(list, index + 1, list.Count - 1)
});
}
