dwds/lib/src/readers/asset_reader.dart - webdev.git - Git at Google

 // Copyright (c) 2020, the Dart 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:collection/collection.dart';
 import 'package:file/file.dart';
 import 'package:logging/logging.dart';
 import 'package:package_config/package_config.dart';

 /// A reader for Dart sources and related source maps.
 abstract class AssetReader {
   /// Base path of the application, for example, set up in the index file:
   ///
   /// ```
   /// <html>
   ///   <head>
   ///     <base href="/abc/">
   ///     <script src="main.dart.js"></script>
   ///   </head>
   /// </html>
   /// ```
   String get basePath;

   /// Returns the contents for a source map at the provided server path, or
   /// null if the resource does not exist.
   Future<String?> sourceMapContents(String serverPath);

   /// Returns the contents for a dart source at the provided server path, or
   /// null if the resource does not exist.
   Future<String?> dartSourceContents(String serverPath);

   /// Returns the contents for the merged metadata output at the provided path,
   /// or null if the resource does not exist.
   Future<String?> metadataContents(String serverPath);

   /// Closes connections
   Future<void> close();
 }

 class PackageUriMapper {
   final _logger = Logger('PackageUriMapper');
   final PackageConfig packageConfig;
   final bool useDebuggerModuleNames;

   static Future<PackageUriMapper> create(
     FileSystem fileSystem,
     Uri packageConfigFile, {
     bool useDebuggerModuleNames = false,
   }) async {
     final packageConfig =
         await loadPackageConfig(fileSystem.file(packageConfigFile));
     return PackageUriMapper(
       packageConfig,
       useDebuggerModuleNames: useDebuggerModuleNames,
     );
   }

   PackageUriMapper(this.packageConfig, {this.useDebuggerModuleNames = false});

   /// Compute server path for package uri.
   ///
   /// Note: needs to match `urlForComponentUri` in javascript_bundle.dart
   /// in SDK code.
   String? packageUriToServerPath(Uri packageUri) {
     final defaultServerPath = '/packages/${packageUri.path}';
     if (packageUri.isScheme('package')) {
       if (!useDebuggerModuleNames) {
         return defaultServerPath;
       }
       final Uri? resolvedUri = packageConfig.resolve(packageUri);
       if (resolvedUri == null) {
         _logger.severe('Cannot resolve package uri $packageUri');
         return defaultServerPath;
       }
       final Package? package = packageConfig.packageOf(resolvedUri);
       if (package == null) {
         _logger.severe('Cannot find package for package uri $packageUri');
         return defaultServerPath;
       }
       final Uri root = package.root;
       final String relativeUrl =
           resolvedUri.toString().replaceFirst('$root', '');
       final String? relativeRoot = _getRelativeRoot(root);
       final String ret = relativeRoot == null
           ? 'packages/$relativeUrl'
           : 'packages/$relativeRoot/$relativeUrl';
       return ret;
     }
     _logger.severe('Expected package uri, but found $packageUri');
     return null;
   }

   /// Compute resolved file uri for a server path.
   Uri? serverPathToResolvedUri(String serverPath) {
     serverPath = stripLeadingSlashes(serverPath);
     final segments = serverPath.split('/');
     if (segments.first == 'packages') {
       if (!useDebuggerModuleNames) {
         return packageConfig
             .resolve(Uri(scheme: 'package', pathSegments: segments.skip(1)));
       }
       final String relativeRoot = segments.skip(1).first;
       final String relativeUrl = segments.skip(2).join('/');
       final Package package = packageConfig.packages
           .firstWhere((Package p) => _getRelativeRoot(p.root) == relativeRoot);
       final Uri resolvedUri = package.root.resolve(relativeUrl);

       return resolvedUri;
     }
     _logger.severe('Expected "packages/" path, but found $serverPath');
     return null;
   }
 }

 String stripLeadingSlashes(String path) {
   while (path.startsWith('/')) {
     path = path.substring(1);
   }
   return path;
 }

 String? _getRelativeRoot(Uri root) =>
     root.pathSegments.lastWhereOrNull((segment) => segment.isNotEmpty);
	// Copyright (c) 2020, the Dart 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:collection/collection.dart';
	import 'package:file/file.dart';
	import 'package:logging/logging.dart';
	import 'package:package_config/package_config.dart';

	/// A reader for Dart sources and related source maps.
	abstract class AssetReader {
	/// Base path of the application, for example, set up in the index file:
	///
	/// ```
	/// <html>
	/// <head>
	/// <base href="/abc/">
	/// <script src="main.dart.js"></script>
	/// </head>
	/// </html>
	/// ```
	String get basePath;

	/// Returns the contents for a source map at the provided server path, or
	/// null if the resource does not exist.
	Future<String?> sourceMapContents(String serverPath);

	/// Returns the contents for a dart source at the provided server path, or
	/// null if the resource does not exist.
	Future<String?> dartSourceContents(String serverPath);

	/// Returns the contents for the merged metadata output at the provided path,
	/// or null if the resource does not exist.
	Future<String?> metadataContents(String serverPath);

	/// Closes connections
	Future<void> close();
	}

	class PackageUriMapper {
	final _logger = Logger('PackageUriMapper');
	final PackageConfig packageConfig;
	final bool useDebuggerModuleNames;

	static Future<PackageUriMapper> create(
	FileSystem fileSystem,
	Uri packageConfigFile, {
	bool useDebuggerModuleNames = false,
	}) async {
	final packageConfig =
	await loadPackageConfig(fileSystem.file(packageConfigFile));
	return PackageUriMapper(
	packageConfig,
	useDebuggerModuleNames: useDebuggerModuleNames,
	);
	}

	PackageUriMapper(this.packageConfig, {this.useDebuggerModuleNames = false});

	/// Compute server path for package uri.
	///
	/// Note: needs to match `urlForComponentUri` in javascript_bundle.dart
	/// in SDK code.
	String? packageUriToServerPath(Uri packageUri) {
	final defaultServerPath = '/packages/${packageUri.path}';
	if (packageUri.isScheme('package')) {
	if (!useDebuggerModuleNames) {
	return defaultServerPath;
	}
	final Uri? resolvedUri = packageConfig.resolve(packageUri);
	if (resolvedUri == null) {
	_logger.severe('Cannot resolve package uri $packageUri');
	return defaultServerPath;
	}
	final Package? package = packageConfig.packageOf(resolvedUri);
	if (package == null) {
	_logger.severe('Cannot find package for package uri $packageUri');
	return defaultServerPath;
	}
	final Uri root = package.root;
	final String relativeUrl =
	resolvedUri.toString().replaceFirst('$root', '');
	final String? relativeRoot = _getRelativeRoot(root);
	final String ret = relativeRoot == null
	? 'packages/$relativeUrl'
	: 'packages/$relativeRoot/$relativeUrl';
	return ret;
	}
	_logger.severe('Expected package uri, but found $packageUri');
	return null;
	}

	/// Compute resolved file uri for a server path.
	Uri? serverPathToResolvedUri(String serverPath) {
	serverPath = stripLeadingSlashes(serverPath);
	final segments = serverPath.split('/');
	if (segments.first == 'packages') {
	if (!useDebuggerModuleNames) {
	return packageConfig
	.resolve(Uri(scheme: 'package', pathSegments: segments.skip(1)));
	}
	final String relativeRoot = segments.skip(1).first;
	final String relativeUrl = segments.skip(2).join('/');
	final Package package = packageConfig.packages
	.firstWhere((Package p) => _getRelativeRoot(p.root) == relativeRoot);
	final Uri resolvedUri = package.root.resolve(relativeUrl);

	return resolvedUri;
	}
	_logger.severe('Expected "packages/" path, but found $serverPath');
	return null;
	}
	}

	String stripLeadingSlashes(String path) {
	while (path.startsWith('/')) {
	path = path.substring(1);
	}
	return path;
	}

	String? _getRelativeRoot(Uri root) =>
	root.pathSegments.lastWhereOrNull((segment) => segment.isNotEmpty);