@Nullable @Override public Document getDocument(@NotNull PsiFile file) { if (file instanceof PsiBinaryFile) return null; Document document = getCachedDocument(file); if (document != null) { if (!file.getViewProvider().isPhysical() && document.getUserData(HARD_REF_TO_PSI) == null) { PsiUtilCore.ensureValid(file); cachePsi(document, file); } return document; } FileViewProvider viewProvider = file.getViewProvider(); if (!viewProvider.isEventSystemEnabled()) return null; document = FileDocumentManager.getInstance().getDocument(viewProvider.getVirtualFile()); if (document != null) { if (document.getTextLength() != file.getTextLength()) { String message = "Document/PSI mismatch: " + file + " (" + file.getClass() + "); physical=" + viewProvider.isPhysical(); if (document.getTextLength() + file.getTextLength() < 8096) { message += "\n=== document ===\n" + document.getText() + "\n=== PSI ===\n" + file.getText(); } throw new AssertionError(message); } if (!viewProvider.isPhysical()) { PsiUtilCore.ensureValid(file); cachePsi(document, file); file.putUserData(HARD_REF_TO_DOCUMENT, document); } } return document; }