void (@NotNull PsiReferenceRegistrar registrar) { registrar.registerReferenceProvider(PlatformPatterns.psiElement(PropertiesTokenTypes.VALUE_CHARACTERS), new PsiReferenceProvider() { @Override public PsiReference @NotNull [] getReferencesByElement(@NotNull PsiElement element, @NotNull ProcessingContext context) { if (!DGMUtil.isInDGMFile(element)) return PsiReference.EMPTY_ARRAY; IProperty parent = (IProperty)element.getParent(); if (!"extensionClasses".equals(parent.getName())) { return PsiReference.EMPTY_ARRAY; } ArrayList<PsiReference> result = new ArrayList<>(); String text = element.getText(); int i = 0; while ((i = skipWhiteSpace(i, text)) < text.length()) { int end = findWhiteSpaceOrComma(i, text); if (end <= text.length()) { JavaClassReferenceSet set = new JavaClassReferenceSet(text.substring(i, end), element, i, true, myProvider); ContainerUtil.addAll(result, set.getAllReferences()); } i = end; i = skipWhiteSpace(i, text); if (i == text.length()) break; if (text.charAt(i) == ',') i++; i = skipWhiteSpace(i, text); } return result.toArray(PsiReference.EMPTY_ARRAY); } }); }