private static IClassificationType GetClassificationForIdentifer(IClassificationTypes classificationTypes, SyntaxToken token, SyntaxTree syntaxTree)
{
if (token.Parent is TypeDeclarationSyntax &&
((token.Parent as TypeDeclarationSyntax).Identifier == token))
{
return(GetClassificationForTypeDeclarationIdentifier(classificationTypes, token));
}
else if (token.Parent is EnumDeclarationSyntax &&
(token.Parent as EnumDeclarationSyntax).Identifier == token)
{
return(classificationTypes.EnumTypeName);
}
else if (token.Parent is DelegateDeclarationSyntax &&
(token.Parent as DelegateDeclarationSyntax).Identifier == token)
{
return(classificationTypes.DelegateTypeName);
}
else if (token.Parent is TypeParameterSyntax &&
(token.Parent as TypeParameterSyntax).Identifier == token)
{
return(classificationTypes.TypeParameterName);
}
else if (syntaxTree != null && (syntaxTree.IsActualContextualKeyword(token) || syntaxTree.CouldBeVarKeywordInDeclaration(token)))
{
return(classificationTypes.Keyword);
}
else
{
return(classificationTypes.Identifier);
}
}
/// <summary>
/// Determine the classification type for a given token.
/// </summary>
/// <param name="classificationTypes">A classification service to retrieve classification types.</param>
/// <param name="token">The token.</param>
/// <param name="syntaxTree">The tree containing the token (can be null for tokens that are
/// unparented).</param>
/// <returns>The correct syntactic classification for the token.</returns>
public static IClassificationType GetClassificationForToken(this IClassificationTypes classificationTypes, SyntaxToken token, SyntaxTree syntaxTree)
{
if (SyntaxFacts.IsKeywordKind(token.Kind))
{
return(classificationTypes.Keyword);
}
else if (token.Kind.IsPunctuation())
{
return(GetClassificationForPunctuation(classificationTypes, token));
}
else if (token.Kind == SyntaxKind.IdentifierToken)
{
return(GetClassificationForIdentifer(classificationTypes, token, syntaxTree));
}
else if (token.Kind == SyntaxKind.StringLiteralToken || token.Kind == SyntaxKind.CharacterLiteralToken)
{
return(token.IsVerbatimStringLiteral()
? classificationTypes.VerbatimStringLiteral
: classificationTypes.StringLiteral);
}
else if (token.Kind == SyntaxKind.NumericLiteralToken)
{
return(classificationTypes.NumericLiteral);
}
return(null);
}
private static IClassificationType GetClassificationForIdentifer(IClassificationTypes classificationTypes, SyntaxToken token, SyntaxTree syntaxTree)
{
if (token.Parent is TypeDeclarationSyntax &&
((token.Parent as TypeDeclarationSyntax).Identifier == token))
{
return GetClassificationForTypeDeclarationIdentifier(classificationTypes, token);
}
else if (token.Parent is EnumDeclarationSyntax &&
(token.Parent as EnumDeclarationSyntax).Identifier == token)
{
return classificationTypes.EnumTypeName;
}
else if (token.Parent is DelegateDeclarationSyntax &&
(token.Parent as DelegateDeclarationSyntax).Identifier == token)
{
return classificationTypes.DelegateTypeName;
}
else if (token.Parent is TypeParameterSyntax &&
(token.Parent as TypeParameterSyntax).Identifier == token)
{
return classificationTypes.TypeParameterName;
}
else if (syntaxTree != null && (syntaxTree.IsActualContextualKeyword(token) || syntaxTree.CouldBeVarKeywordInDeclaration(token)))
{
return classificationTypes.Keyword;
}
else
{
return classificationTypes.Identifier;
}
}
private static IClassificationType GetClassificationForTypeDeclarationIdentifier(IClassificationTypes classificationTypes, SyntaxToken identifier)
{
switch (identifier.Parent.Kind)
{
case SyntaxKind.ClassDeclaration:
return classificationTypes.TypeName;
case SyntaxKind.StructDeclaration:
return classificationTypes.StructureTypeName;
case SyntaxKind.InterfaceDeclaration:
return classificationTypes.InterfaceTypeName;
default:
return null;
}
}
private static IClassificationType GetClassificationForPunctuation(IClassificationTypes classificationTypes, SyntaxToken token)
{
if (token.Kind.IsOperator())
{
// special cases...
switch (token.Kind)
{
case SyntaxKind.LessThanToken:
case SyntaxKind.GreaterThanToken:
// the < and > tokens of a type parameter list should be classified as
// punctuation; otherwise, they're operators.
if (token.Parent != null)
{
if (token.Parent.Kind == SyntaxKind.TypeParameterList ||
token.Parent.Kind == SyntaxKind.TypeArgumentList)
{
return(classificationTypes.Punctuation);
}
}
break;
case SyntaxKind.ColonToken:
// the : for inheritance/implements or labels should be classified as
// punctuation; otherwise, it's from a conditional operator.
if (token.Parent != null)
{
if (token.Parent.Kind != SyntaxKind.ConditionalExpression)
{
return(classificationTypes.Punctuation);
}
}
break;
}
return(classificationTypes.Operator);
}
else
{
return(classificationTypes.Punctuation);
}
}
private static IClassificationType GetClassificationForTypeDeclarationIdentifier(IClassificationTypes classificationTypes, SyntaxToken identifier)
{
switch (identifier.Parent.Kind)
{
case SyntaxKind.ClassDeclaration:
return(classificationTypes.TypeName);
case SyntaxKind.StructDeclaration:
return(classificationTypes.StructureTypeName);
case SyntaxKind.InterfaceDeclaration:
return(classificationTypes.InterfaceTypeName);
default:
return(null);
}
}
private static IClassificationType GetClassificationForPunctuation(IClassificationTypes classificationTypes, SyntaxToken token)
{
if (token.Kind.IsOperator())
{
// special cases...
switch (token.Kind)
{
case SyntaxKind.LessThanToken:
case SyntaxKind.GreaterThanToken:
// the < and > tokens of a type parameter list should be classified as
// punctuation; otherwise, they're operators.
if (token.Parent != null)
{
if (token.Parent.Kind == SyntaxKind.TypeParameterList ||
token.Parent.Kind == SyntaxKind.TypeArgumentList)
{
return classificationTypes.Punctuation;
}
}
break;
case SyntaxKind.ColonToken:
// the : for inheritance/implements or labels should be classified as
// punctuation; otherwise, it's from a conditional operator.
if (token.Parent != null)
{
if (token.Parent.Kind != SyntaxKind.ConditionalExpression)
{
return classificationTypes.Punctuation;
}
}
break;
}
return classificationTypes.Operator;
}
else
{
return classificationTypes.Punctuation;
}
}
