Ruby. Slim. Supported colon ":" as tag delimiter

platform/core-impl/src/com/intellij/indentation/IndentationParser.java

@@ -113,6 +113,10 @@ public abstract class IndentationParser implements PsiParser {
             // sometimes we do not have EOL between indents
             eolSeen = true;
           }
+          if (isCustomTagDelimiter(type)) {
+            builder.advanceLexer();
+            eolSeen = true;
+          }
           if (eolSeen) {
             if (startLineMarker != null) {
               startLineMarker.rollbackTo();
@@ -165,6 +169,10 @@ public abstract class IndentationParser implements PsiParser {
     return builder.getTreeBuilt();
   }
 
+  protected boolean isCustomTagDelimiter(IElementType type) {
+    return false;
+  }
+
   protected void closeBlock(final @NotNull PsiBuilder builder,
                             final @NotNull PsiBuilder.Marker marker,
                             final @Nullable IElementType startTokenType)