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Viewing file:     Switch.js (2.11 KB)      -rw-r--r--

import React from "react";
import PropTypes from "prop-types";
import invariant from "tiny-invariant";
import warning from "tiny-warning";

import RouterContext from "./RouterContext.js";
import matchPath from "./matchPath.js";

/**
 * The public API for rendering the first <Route> that matches.
 */
class Switch extends React.Component {
  render() {
    return (
      <RouterContext.Consumer>
        {context => {
          invariant(context, "You should not use <Switch> outside a <Router>");

          const location = this.props.location || context.location;

          let element, match;

          // We use React.Children.forEach instead of React.Children.toArray().find()
          // here because toArray adds keys to all child elements and we do not want
          // to trigger an unmount/remount for two <Route>s that render the same
          // component at different URLs.
          React.Children.forEach(this.props.children, child => {
            if (match == null && React.isValidElement(child)) {
              element = child;

              const path = child.props.path || child.props.from;

              match = path
                ? matchPath(location.pathname, { ...child.props, path })
                : context.match;
            }
          });

          return match
            ? React.cloneElement(element, { location, computedMatch: match })
            : null;
        }}
      </RouterContext.Consumer>
    );
  }
}

if (__DEV__) {
  Switch.propTypes = {
    children: PropTypes.node,
    location: PropTypes.object
  };

  Switch.prototype.componentDidUpdate = function(prevProps) {
    warning(
      !(this.props.location && !prevProps.location),
      '<Switch> elements should not change from uncontrolled to controlled (or vice versa). You initially used no "location" prop and then provided one on a subsequent render.'
    );

    warning(
      !(!this.props.location && prevProps.location),
      '<Switch> elements should not change from controlled to uncontrolled (or vice versa). You provided a "location" prop initially but omitted it on a subsequent render.'
    );
  };
}

export default Switch;