stream-chat-react-native-core/lib/module/components/Message/hooks/useStreamingMessage.js

The official React Native and Expo components for Stream Chat, a service for building chat applications

var _interopRequireDefault = require("@babel/runtime/helpers/interopRequireDefault");
Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.useStreamingMessage = void 0;
var _slicedToArray2 = _interopRequireDefault(require("@babel/runtime/helpers/slicedToArray"));
var _react = require("react");
var DEFAULT_LETTER_INTERVAL = 0;
var DEFAULT_RENDERING_LETTER_COUNT = 2;
var useStreamingMessage = ({
  letterInterval = DEFAULT_LETTER_INTERVAL,
  renderingLetterCount = DEFAULT_RENDERING_LETTER_COUNT,
  text
}) => {
  var _useState = (0, _react.useState)(text),
    _useState2 = (0, _slicedToArray2.default)(_useState, 2),
    streamedMessageText = _useState2[0],
    setStreamedMessageText = _useState2[1];
  var textCursor = (0, _react.useRef)(text.length);
  (0, _react.useEffect)(() => {
    var textLength = text.length;
    var interval = setInterval(() => {
      if (!text || textCursor.current >= textLength) {
        clearInterval(interval);
      }
      var newCursorValue = textCursor.current + renderingLetterCount;
      var newText = text.substring(0, newCursorValue);
      textCursor.current += newText.length - textCursor.current;
      var codeBlockCounts = (newText.match(/```/g) || []).length;
      var shouldOptimisticallyCloseCodeBlock = codeBlockCounts > 0 && codeBlockCounts % 2 > 0;
      setStreamedMessageText(shouldOptimisticallyCloseCodeBlock ? newText + '```' : newText);
    }, letterInterval);
    return () => {
      clearInterval(interval);
    };
  }, [letterInterval, renderingLetterCount, text]);
  return {
    streamedMessageText
  };
};
exports.useStreamingMessage = useStreamingMessage;
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