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lib/13/go/raw_book/src/routing/parser.dart

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+// Copyright 2021, the Flutter project authors. Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+import 'package:flutter/widgets.dart';
+import 'package:path_to_regexp/path_to_regexp.dart';
+
+import 'parsed_route.dart';
+
+/// Used by [TemplateRouteParser] to guard access to routes.
+typedef RouteGuard<T> = Future<T> Function(T from);
+
+/// Parses the URI path into a [ParsedRoute].
+class TemplateRouteParser extends RouteInformationParser<ParsedRoute> {
+  final List<String> _pathTemplates;
+  final ParsedRoute initialRoute;
+
+  TemplateRouteParser({
+    /// The list of allowed path templates (['/', '/users/:id'])
+    required List<String> allowedPaths,
+
+    /// The initial route
+    String initialRoute = '/',
+
+  })  : initialRoute = ParsedRoute(initialRoute, initialRoute, {}, {}),
+        _pathTemplates = [
+          ...allowedPaths,
+        ],
+        assert(allowedPaths.contains(initialRoute));
+
+  @override
+  Future<ParsedRoute> parseRouteInformation(
+    RouteInformation routeInformation,
+  ) async {
+    print("=======parseRouteInformation:${routeInformation.uri.path}===================");
+
+    final uri = routeInformation.uri;
+    final path = uri.toString();
+    final queryParams = uri.queryParameters;
+    var parsedRoute = initialRoute;
+
+    for (var pathTemplate in _pathTemplates) {
+      final parameters = <String>[];
+      var pathRegExp = pathToRegExp(pathTemplate, parameters: parameters);
+      if (pathRegExp.hasMatch(path)) {
+        final match = pathRegExp.matchAsPrefix(path);
+        if (match == null) continue;
+        final params = extract(parameters, match);
+        parsedRoute = ParsedRoute(path, pathTemplate, params, queryParams);
+      }
+    }
+
+    return parsedRoute;
+  }
+
+  @override
+  RouteInformation restoreRouteInformation(ParsedRoute configuration) {
+    print("=======restoreRouteInformation:${configuration}===================");
+
+    return RouteInformation(uri: Uri.parse(configuration.path));
+  }
+}