stream method

@override Stream<String> stream(File file)

Extracts text content from a file and returns it as a stream of strings.

Implementing classes must define how to parse their specific file format. @param file The file to extract text from

Implementation

@override
Stream<String> stream(File file) async* {
  Uint8List bytes = await file.readAsBytes();
  _zipDecoder ??= ZipDecoder();
  Archive archive = _zipDecoder!.decodeBytes(bytes);

  for (final file in archive) {
    if (file.isFile && file.name == 'word/document.xml') {
      String fileContent = utf8.decode(file.content);
      xml.XmlDocument document = xml.XmlDocument.parse(fileContent);
      Iterable<xml.XmlElement> paragraphNodes = document.findAllElements(
        'w:p',
      );
      int number = 0;
      String lastNumId = '0';

      for (final paragraph in paragraphNodes) {
        final textNodes = paragraph.findAllElements('w:t');
        var text = textNodes.map((node) => node.innerText).join();

        if (handleNumbering) {
          var numbering = paragraph
              .getElement('w:pPr')
              ?.getElement('w:numPr');
          if (numbering != null) {
            final numId =
                numbering.getElement('w:numId')!.getAttribute('w:val')!;

            if (numId != lastNumId) {
              number = 0;
              lastNumId = numId;
            }
            number++;
            text = '$number. $text';
          }
        }

        yield text;
        yield "\n";
      }
    }
  }
}