void _lookupParameterInfo()

in lib/parameter_popup.dart [71:131]
52 lines of code
9 McCabe index (conditional complexity)

  void _lookupParameterInfo() {
    var offset = editor.document.indexFromPos(editor.document.cursor);
    final source = editor.document.value;
    var parInfo = _parameterInfo(source, offset);

    if (parInfo == null) {
      remove();
      return;
    }

    final openingParenIndex = parInfo['openingParenIndex']!;
    final parameterIndex = parInfo['parameterIndex'];
    offset = openingParenIndex - 1;

    // We request documentation info of what is before the parenthesis.
    final input = SourceRequest()
      ..source = source
      ..offset = offset;

    dartServices
        .document(input)
        .timeout(serviceCallTimeout)
        .then((DocumentResponse result) {
      if (!result.info.containsKey('parameters')) {
        remove();
        return;
      }

      final parameterInfo = result.info['parameters']!;
      var outputString = '';
      if (parameterInfo.isEmpty) {
        outputString += '<code>&lt;no parameters&gt;</code>';
      } else if (parameterInfo.length < parameterIndex! + 1) {
        outputString += '<code>too many parameters listed</code>';
      } else {
        outputString += '<code>';

        for (var i = 0; i < parameterInfo.length; i++) {
          if (i == parameterIndex) {
            outputString += '<em>${sanitizer.convert(parameterInfo[i])}</em>';
          } else {
            outputString +=
                '<span>${sanitizer.convert(parameterInfo[i])}</span>';
          }
          if (i != parameterInfo.length - 1) {
            outputString += ', ';
          }
        }
        outputString += '</code>';
      }

      // Check if cursor is still in parameter position
      parInfo = _parameterInfo(editor.document.value,
          editor.document.indexFromPos(editor.document.cursor));
      if (parInfo == null) {
        remove();
        return;
      }
      _showParameterPopup(outputString, offset);
    });
  }