private static String getHeredocPlaceholder(@NotNull PsiElement heredocContent, @NotNull Document document) {
    TextRange textRange = heredocContent.getTextRange();
    int lineNumber = document.getLineNumber(textRange.getStartOffset());
    int startOffset = document.getLineStartOffset(lineNumber);
    int endOffset = document.getLineEndOffset(lineNumber);
    return document.getText(TextRange.create(startOffset, endOffset)).trim() + "...";
  }
private static String getHeredocPlaceholder(@NotNull PsiElement heredocContent, @NotNull Document document)