private ClassificationSpan ClassifyToken(IToken token, IList <ClassificationSpan> regionTags, ITextSnapshot snapshot)
{
var tokenType = token.Type;
ClassificationSpan result = null;
switch (token.Channel)
{
case XSharpLexer.PRAGMACHANNEL: // #pragma
case XSharpLexer.PREPROCESSORCHANNEL:
// #define, #ifdef etc
result = Token2ClassificationSpan(token, snapshot, xsharpPPType);
switch (token.Type)
{
case XSharpLexer.PP_REGION:
case XSharpLexer.PP_IFDEF:
case XSharpLexer.PP_IFNDEF:
regionTags.Add(Token2ClassificationSpan(token, snapshot, xsharpRegionStart));
break;
case XSharpLexer.PP_ENDREGION:
case XSharpLexer.PP_ENDIF:
regionTags.Add(Token2ClassificationSpan(token, snapshot, xsharpRegionStop));
break;
default:
break;
}
break;
case XSharpLexer.DEFOUTCHANNEL: // code in an inactive #ifdef
result = Token2ClassificationSpan(token, snapshot, xsharpInactiveType);
break;
case XSharpLexer.XMLDOCCHANNEL:
case XSharpLexer.Hidden:
if (XSharpLexer.IsComment(token.Type))
{
result = Token2ClassificationSpan(token, snapshot, xsharpCommentType);
if (token.Type == XSharpLexer.ML_COMMENT && token.Text.IndexOf("\r") >= 0)
{
regionTags.Add(Token2ClassificationSpan(token, snapshot, xsharpRegionStart));
regionTags.Add(Token2ClassificationSpan(token, snapshot, xsharpRegionStop));
}
}
break;
default: // Normal channel
IClassificationType type = null;
if (XSharpLexer.IsIdentifier(tokenType))
{
type = xsharpIdentifierType;
}
else if (XSharpLexer.IsConstant(tokenType))
{
switch (tokenType)
{
case XSharpLexer.STRING_CONST:
case XSharpLexer.CHAR_CONST:
case XSharpLexer.ESCAPED_STRING_CONST:
case XSharpLexer.INTERPOLATED_STRING_CONST:
type = xsharpStringType;
break;
case XSharpLexer.FALSE_CONST:
case XSharpLexer.TRUE_CONST:
type = xsharpKeywordType;
break;
case XSharpLexer.VO_AND:
case XSharpLexer.VO_NOT:
case XSharpLexer.VO_OR:
case XSharpLexer.VO_XOR:
case XSharpLexer.SYMBOL_CONST:
case XSharpLexer.NIL:
type = xsharpLiteralType;
break;
default:
if ((tokenType >= XSharpLexer.FIRST_NULL) && (tokenType <= XSharpLexer.LAST_NULL))
{
type = xsharpKeywordType;
break;
}
else
{
type = xsharpNumberType;
}
break;
}
}
else if (XSharpLexer.IsKeyword(tokenType))
{
type = xsharpKeywordType;
}
else if (XSharpLexer.IsOperator(tokenType))
{
switch (tokenType)
{
case XSharpLexer.LPAREN:
case XSharpLexer.LCURLY:
case XSharpLexer.LBRKT:
type = xsharpBraceOpenType;
break;
case XSharpLexer.RPAREN:
case XSharpLexer.RCURLY:
case XSharpLexer.RBRKT:
type = xsharpBraceCloseType;
break;
default:
type = xsharpOperatorType;
break;
}
}
if (type != null)
{
result = Token2ClassificationSpan(token, snapshot, type);
}
break;
}
return(result);
}
/// <summary>
/// Parse the current Snapshot, and build the Tag List
/// </summary>
private void Colorize()
{
var snapshot = this.Buffer.CurrentSnapshot;
Snapshot = snapshot;
ITokenStream TokenStream = null;
// parse for positional keywords that change the colors
// and get a reference to the tokenstream
string path = String.Empty;
if (txtdocfactory != null)
{
ITextDocument doc = null;
if (txtdocfactory.TryGetTextDocument(this.Buffer, out doc))
{
path = doc.FilePath;
}
}
// Parse the source and get the (Lexer) Tokenstream to locate comments, keywords and other tokens.
// The parser will identify (positional) keywords that are used as identifier
xsTagger.Parse(snapshot, out TokenStream, path);
if (TokenStream != null)
{
tags.Clear();
for (var iToken = 0; iToken < TokenStream.Size; iToken++)
{
var token = TokenStream.Get(iToken);
var tokenType = token.Type;
TextSpan tokenSpan = new TextSpan(token.StartIndex, token.StopIndex - token.StartIndex + 1);
if (XSharpLexer.IsKeyword(tokenType))
{
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpKeywordType));
}
else if (XSharpLexer.IsConstant(tokenType))
{
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpConstantType));
}
else if (XSharpLexer.IsOperator(tokenType))
{
switch (tokenType)
{
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.LPAREN:
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.LCURLY:
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.LBRKT:
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpBraceOpenType));
break;
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.RPAREN:
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.RCURLY:
case LanguageService.CodeAnalysis.XSharp.SyntaxParser.XSharpLexer.RBRKT:
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpBraceCloseType));
break;
default:
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpOperatorType));
break;
}
}
else if (XSharpLexer.IsIdentifier(tokenType))
{
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpIdentifierType));
}
else if (XSharpLexer.IsComment(tokenType))
{
tags.Add(tokenSpan.ToTagSpan(snapshot, xsharpCommentType));
}
}
foreach (var tag in xsTagger.Tags)
{
tags.Add(tag);
}
if (TagsChanged != null)
{
TagsChanged(this, new SnapshotSpanEventArgs(new SnapshotSpan(Buffer.CurrentSnapshot,
0, this.Buffer.CurrentSnapshot.Length)));
}
}
}