@Override
             protected void addCompletions(@NotNull CompletionParameters parameters,
                                           @NotNull ProcessingContext context,
                                           @NotNull CompletionResultSet result) {
               final PsiFile file = parameters.getOriginalFile();
               final PsiElement stringNode = parameters.getOriginalPosition();
               assert stringNode != null;
               final int offset = parameters.getOffset();
               final DocStringFormat format = DocStringParser.getConfiguredDocStringFormat(file);
               if (!(format == DocStringFormat.GOOGLE || format == DocStringFormat.NUMPY)) {
                 return;
               }
               // Numpy docstring format is ambiguous. Because parameters have the same indentation as section headers,
               // beginning of section header can be parsed as parameter reference
               if (format == DocStringFormat.GOOGLE && file.findReferenceAt(offset) != null) {
                 return;
               }
               final Document document = parameters.getEditor().getDocument();
               final TextRange linePrefixRange = new TextRange(document.getLineStartOffset(document.getLineNumber(offset)), offset);
               final String prefix = StringUtil.trimLeading(document.getText(linePrefixRange));
               result = result.withPrefixMatcher(prefix).caseInsensitive();
               final Iterable<String> names = format == DocStringFormat.GOOGLE ? GoogleCodeStyleDocString.PREFERRED_SECTION_HEADERS
                                                                               : NumpyDocString.PREFERRED_SECTION_HEADERS;
               for (String tag : names) {
                 result.addElement(LookupElementBuilder.create(tag));
               }
             }
@Override
             protected void addCompletions(@NotNull CompletionParameters parameters,
                                           @NotNull ProcessingContext context,
                                           @NotNull CompletionResultSet result)