@react-navigation/native/lib/module/useLinking.js

import { findFocusedRoute, getActionFromState as getActionFromStateDefault, getPathFromState as getPathFromStateDefault, getStateFromPath as getStateFromPathDefault } from '@react-navigation/core';
import isEqual from 'fast-deep-equal';
import * as React from 'react';
import createMemoryHistory from './createMemoryHistory';
import ServerContext from './ServerContext';

/**
 * Find the matching navigation state that changed between 2 navigation states
 * e.g.: a -> b -> c -> d and a -> b -> c -> e -> f, if history in b changed, b is the matching state
 */
const findMatchingState = (a, b) => {
  if (a === undefined || b === undefined || a.key !== b.key) {
    return [undefined, undefined];
  } // Tab and drawer will have `history` property, but stack will have history in `routes`


  const aHistoryLength = a.history ? a.history.length : a.routes.length;
  const bHistoryLength = b.history ? b.history.length : b.routes.length;
  const aRoute = a.routes[a.index];
  const bRoute = b.routes[b.index];
  const aChildState = aRoute.state;
  const bChildState = bRoute.state; // Stop here if this is the state object that changed:
  // - history length is different
  // - focused routes are different
  // - one of them doesn't have child state
  // - child state keys are different

  if (aHistoryLength !== bHistoryLength || aRoute.key !== bRoute.key || aChildState === undefined || bChildState === undefined || aChildState.key !== bChildState.key) {
    return [a, b];
  }

  return findMatchingState(aChildState, bChildState);
};
/**
 * Run async function in series as it's called.
 */


const series = cb => {
  // Whether we're currently handling a callback
  let handling = false;
  let queue = [];

  const callback = async () => {
    try {
      if (handling) {
        // If we're currently handling a previous event, wait before handling this one
        // Add the callback to the beginning of the queue
        queue.unshift(callback);
        return;
      }

      handling = true;
      await cb();
    } finally {
      handling = false;

      if (queue.length) {
        // If we have queued items, handle the last one
        const last = queue.pop();
        last === null || last === void 0 ? void 0 : last();
      }
    }
  };

  return callback;
};

let linkingHandlers = [];
export default function useLinking(ref, _ref) {
  let {
    independent,
    enabled = true,
    config,
    getStateFromPath = getStateFromPathDefault,
    getPathFromState = getPathFromStateDefault,
    getActionFromState = getActionFromStateDefault
  } = _ref;
  React.useEffect(() => {
    if (process.env.NODE_ENV === 'production') {
      return undefined;
    }

    if (independent) {
      return undefined;
    }

    if (enabled !== false && linkingHandlers.length) {
      console.error(['Looks like you have configured linking in multiple places. This is likely an error since deep links should only be handled in one place to avoid conflicts. Make sure that:', "- You don't have multiple NavigationContainers in the app each with 'linking' enabled", '- Only a single instance of the root component is rendered'].join('\n').trim());
    }

    const handler = Symbol();

    if (enabled !== false) {
      linkingHandlers.push(handler);
    }

    return () => {
      const index = linkingHandlers.indexOf(handler);

      if (index > -1) {
        linkingHandlers.splice(index, 1);
      }
    };
  }, [enabled, independent]);
  const [history] = React.useState(createMemoryHistory); // We store these options in ref to avoid re-creating getInitialState and re-subscribing listeners
  // This lets user avoid wrapping the items in `React.useCallback` or `React.useMemo`
  // Not re-creating `getInitialState` is important coz it makes it easier for the user to use in an effect

  const enabledRef = React.useRef(enabled);
  const configRef = React.useRef(config);
  const getStateFromPathRef = React.useRef(getStateFromPath);
  const getPathFromStateRef = React.useRef(getPathFromState);
  const getActionFromStateRef = React.useRef(getActionFromState);
  React.useEffect(() => {
    enabledRef.current = enabled;
    configRef.current = config;
    getStateFromPathRef.current = getStateFromPath;
    getPathFromStateRef.current = getPathFromState;
    getActionFromStateRef.current = getActionFromState;
  });
  const server = React.useContext(ServerContext);
  const getInitialState = React.useCallback(() => {
    let value;

    if (enabledRef.current) {
      var _server$location;

      const location = (_server$location = server === null || server === void 0 ? void 0 : server.location) !== null && _server$location !== void 0 ? _server$location : typeof window !== 'undefined' ? window.location : undefined;
      const path = location ? location.pathname + location.search : undefined;

      if (path) {
        value = getStateFromPathRef.current(path, configRef.current);
      }
    }

    const thenable = {
      then(onfulfilled) {
        return Promise.resolve(onfulfilled ? onfulfilled(value) : value);
      },

      catch() {
        return thenable;
      }

    };
    return thenable; // eslint-disable-next-line react-hooks/exhaustive-deps
  }, []);
  const previousIndexRef = React.useRef(undefined);
  const previousStateRef = React.useRef(undefined);
  const pendingPopStatePathRef = React.useRef(undefined);
  React.useEffect(() => {
    previousIndexRef.current = history.index;
    return history.listen(() => {
      var _previousIndexRef$cur;

      const navigation = ref.current;

      if (!navigation || !enabled) {
        return;
      }

      const path = location.pathname + location.search;
      const index = history.index;
      const previousIndex = (_previousIndexRef$cur = previousIndexRef.current) !== null && _previousIndexRef$cur !== void 0 ? _previousIndexRef$cur : 0;
      previousIndexRef.current = index;
      pendingPopStatePathRef.current = path; // When browser back/forward is clicked, we first need to check if state object for this index exists
      // If it does we'll reset to that state object
      // Otherwise, we'll handle it like a regular deep link

      const record = history.get(index);

      if ((record === null || record === void 0 ? void 0 : record.path) === path && record !== null && record !== void 0 && record.state) {
        navigation.resetRoot(record.state);
        return;
      }

      const state = getStateFromPathRef.current(path, configRef.current); // We should only dispatch an action when going forward
      // Otherwise the action will likely add items to history, which would mess things up

      if (state) {
        // Make sure that the routes in the state exist in the root navigator
        // Otherwise there's an error in the linking configuration
        const rootState = navigation.getRootState();

        if (state.routes.some(r => !(rootState !== null && rootState !== void 0 && rootState.routeNames.includes(r.name)))) {
          console.warn("The navigation state parsed from the URL contains routes not present in the root navigator. This usually means that the linking configuration doesn't match the navigation structure. See https://reactnavigation.org/docs/configuring-links for more details on how to specify a linking configuration.");
          return;
        }

        if (index > previousIndex) {
          const action = getActionFromStateRef.current(state, configRef.current);

          if (action !== undefined) {
            try {
              navigation.dispatch(action);
            } catch (e) {
              // Ignore any errors from deep linking.
              // This could happen in case of malformed links, navigation object not being initialized etc.
              console.warn(`An error occurred when trying to handle the link '${path}': ${typeof e === 'object' && e != null && 'message' in e ? // @ts-expect-error: we're already checking for this
              e.message : e}`);
            }
          } else {
            navigation.resetRoot(state);
          }
        } else {
          navigation.resetRoot(state);
        }
      } else {
        // if current path didn't return any state, we should revert to initial state
        navigation.resetRoot(state);
      }
    });
  }, [enabled, history, ref]);
  React.useEffect(() => {
    var _ref$current;

    if (!enabled) {
      return;
    }

    const getPathForRoute = (route, state) => {
      // If the `route` object contains a `path`, use that path as long as `route.name` and `params` still match
      // This makes sure that we preserve the original URL for wildcard routes
      if (route !== null && route !== void 0 && route.path) {
        const stateForPath = getStateFromPathRef.current(route.path, configRef.current);

        if (stateForPath) {
          const focusedRoute = findFocusedRoute(stateForPath);

          if (focusedRoute && focusedRoute.name === route.name && isEqual(focusedRoute.params, route.params)) {
            return route.path;
          }
        }
      }

      return getPathFromStateRef.current(state, configRef.current);
    };

    if (ref.current) {
      // We need to record the current metadata on the first render if they aren't set
      // This will allow the initial state to be in the history entry
      const state = ref.current.getRootState();

      if (state) {
        const route = findFocusedRoute(state);
        const path = getPathForRoute(route, state);

        if (previousStateRef.current === undefined) {
          previousStateRef.current = state;
        }

        history.replace({
          path,
          state
        });
      }
    }

    const onStateChange = async () => {
      const navigation = ref.current;

      if (!navigation || !enabled) {
        return;
      }

      const previousState = previousStateRef.current;
      const state = navigation.getRootState(); // root state may not available, for example when root navigators switch inside the container

      if (!state) {
        return;
      }

      const pendingPath = pendingPopStatePathRef.current;
      const route = findFocusedRoute(state);
      const path = getPathForRoute(route, state);
      previousStateRef.current = state;
      pendingPopStatePathRef.current = undefined; // To detect the kind of state change, we need to:
      // - Find the common focused navigation state in previous and current state
      // - If only the route keys changed, compare history/routes.length to check if we go back/forward/replace
      // - If no common focused navigation state found, it's a replace

      const [previousFocusedState, focusedState] = findMatchingState(previousState, state);

      if (previousFocusedState && focusedState && // We should only handle push/pop if path changed from what was in last `popstate`
      // Otherwise it's likely a change triggered by `popstate`
      path !== pendingPath) {
        const historyDelta = (focusedState.history ? focusedState.history.length : focusedState.routes.length) - (previousFocusedState.history ? previousFocusedState.history.length : previousFocusedState.routes.length);

        if (historyDelta > 0) {
          // If history length is increased, we should pushState
          // Note that path might not actually change here, for example, drawer open should pushState
          history.push({
            path,
            state
          });
        } else if (historyDelta < 0) {
          // If history length is decreased, i.e. entries were removed, we want to go back
          const nextIndex = history.backIndex({
            path
          });
          const currentIndex = history.index;

          try {
            if (nextIndex !== -1 && nextIndex < currentIndex) {
              // An existing entry for this path exists and it's less than current index, go back to that
              await history.go(nextIndex - currentIndex);
            } else {
              // We couldn't find an existing entry to go back to, so we'll go back by the delta
              // This won't be correct if multiple routes were pushed in one go before
              // Usually this shouldn't happen and this is a fallback for that
              await history.go(historyDelta);
            } // Store the updated state as well as fix the path if incorrect


            history.replace({
              path,
              state
            });
          } catch (e) {// The navigation was interrupted
          }
        } else {
          // If history length is unchanged, we want to replaceState
          history.replace({
            path,
            state
          });
        }
      } else {
        // If no common navigation state was found, assume it's a replace
        // This would happen if the user did a reset/conditionally changed navigators
        history.replace({
          path,
          state
        });
      }
    }; // We debounce onStateChange coz we don't want multiple state changes to be handled at one time
    // This could happen since `history.go(n)` is asynchronous
    // If `pushState` or `replaceState` were called before `history.go(n)` completes, it'll mess stuff up


    return (_ref$current = ref.current) === null || _ref$current === void 0 ? void 0 : _ref$current.addListener('state', series(onStateChange));
  });
  return {
    getInitialState
  };
}
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