packages/flutter_tools/lib/src/web/bootstrap.dart - mirrors/flutter - Git at Google

 // Copyright 2014 The Flutter Authors. 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:meta/meta.dart';

 // This logic is taken directly from https://github.com/dart-lang/build/blob/master/build_web_compilers/lib/src/dev_compiler_bootstrap.dart#L272
 // It should be fairly stable, but is otherwise required to interact with the client.js script
 // vendored with DWDS.
 const String _currentDirectoryScript = r'''
 var _currentDirectory = (function () {
   var _url;
   var lines = new Error().stack.split('\n');
   function lookupUrl() {
     if (lines.length > 2) {
       var match = lines[1].match(/^\s+at (.+):\d+:\d+$/);
       // Chrome.
       if (match) return match[1];
       // Chrome nested eval case.
       match = lines[1].match(/^\s+at eval [(](.+):\d+:\d+[)]$/);
       if (match) return match[1];
       // Edge.
       match = lines[1].match(/^\s+at.+\((.+):\d+:\d+\)$/);
       if (match) return match[1];
       // Firefox.
       match = lines[0].match(/[<][@](.+):\d+:\d+$/)
       if (match) return match[1];
     }
     // Safari.
     return lines[0].match(/(.+):\d+:\d+$/)[1];
   }
   _url = lookupUrl();
   var lastSlash = _url.lastIndexOf('/');
   if (lastSlash == -1) return _url;
   var currentDirectory = _url.substring(0, lastSlash + 1);
   return currentDirectory;
 })();
 ''';

 /// The JavaScript bootstrap script to support in-browser hot restart.
 ///
 /// The [requireUrl] loads our cached RequireJS script file. The [mapperUrl]
 /// loads the special Dart stack trace mapper. The [entrypoint] is the
 /// actual main.dart file.
 ///
 /// This file is served when the browser requests "main.dart.js" in debug mode,
 /// and is responsible for bootstrapping the RequireJS modules and attaching
 /// the hot reload hooks.
 String generateBootstrapScript({
   @required String requireUrl,
   @required String mapperUrl,
   @required String entrypoint,
 }) {
   return '''
 "use strict";

 // Attach source mapping.
 var mapperEl = document.createElement("script");
 mapperEl.defer = true;
 mapperEl.async = false;
 mapperEl.src = "$mapperUrl";
 document.head.appendChild(mapperEl);

 // Attach require JS.
 var requireEl = document.createElement("script");
 requireEl.defer = true;
 requireEl.async = false;
 requireEl.src = "$requireUrl";
 // This attribute tells require JS what to load as main (defined below).
 requireEl.setAttribute("data-main", "main_module.bootstrap");
 document.head.appendChild(requireEl);

 // Invoked by connected chrome debugger for hot reload/restart support.
 window.\$hotReloadHook = function(modules) {
   return new Promise(function(resolve, reject) {
     if (modules == null) {
       reject();
     }
     // If no modules change, return immediately.
     if (modules.length == 0) {
       resolve();
     }
     var reloadCount = 0;
     for (var i = 0; i < modules.length; i++) {
       require.undef(modules[i]);
       require([modules[i]], function(module) {
         reloadCount += 1;
         // once we've reloaded every module, trigger the hot reload.
         if (reloadCount == modules.length) {
           require(["$entrypoint", "dart_sdk"], function(app, dart_sdk) {
             // See the doc comment under in generateMainModule.
             window.\$dartRunMain = app[Object.keys(app)[0]].main;
             window.\$hotReload(resolve);
           });
         }
       });
     }
   });
 }
 ''';
 }

 /// Generate a synthetic main module which captures the application's main
 /// method.
 ///
 /// RE: Object.keys usage in app.main:
 /// This attaches the main entrypoint and hot reload functionality to the window.
 /// The app module will have a single property which contains the actual application
 /// code. The property name is based off of the entrypoint that is generated, for example
 /// the file `foo/bar/baz.dart` will generate a property named approximately
 /// `foo__bar__baz`. Rather than attempt to guess, we assume the first property of
 /// this object is the module.
 String generateMainModule({@required String entrypoint}) {
   return '''/* ENTRYPOINT_EXTENTION_MARKER */
 // baseUrlScript
 var baseUrl = (function () {
   // Attempt to detect --precompiled mode for tests, and set the base url
   // appropriately, otherwise set it to '/'.
   var pathParts = location.pathname.split("/");
   if (pathParts[0] == "") {
     pathParts.shift();
   }
   if (pathParts.length > 1 && pathParts[1] == "test") {
     return "/" + pathParts.slice(0, 2).join("/") + "/";
   }
   // Attempt to detect base url using <base href> html tag
   // base href should start and end with "/"
   if (typeof document !== 'undefined') {
     var el = document.getElementsByTagName('base');
     if (el && el[0] && el[0].getAttribute("href") && el[0].getAttribute
     ("href").startsWith("/") && el[0].getAttribute("href").endsWith("/")){
       return el[0].getAttribute("href");
     }
   }
   // return default value
   return "/";
 }());
 $_currentDirectoryScript
 // dart loader
 if(!window.\$dartLoader) {
    window.\$dartLoader = {
      appDigests: _currentDirectory + 'basic.digests',
      moduleIdToUrl: new Map(),
      urlToModuleId: new Map(),
      rootDirectories: new Array(),
      // Used in package:build_runner/src/server/build_updates_client/hot_reload_client.dart
      moduleParentsGraph: new Map(),
      moduleLoadingErrorCallbacks: new Map(),
      forceLoadModule: function (moduleName, callback, onError) {
        if (typeof onError != 'undefined') {
          var errorCallbacks = \$dartLoader.moduleLoadingErrorCallbacks;
          if (!errorCallbacks.has(moduleName)) {
            errorCallbacks.set(moduleName, new Set());
          }
          errorCallbacks.get(moduleName).add(onError);
        }
        requirejs.undef(moduleName);
        requirejs([moduleName], function() {
          if (typeof onError != 'undefined') {
            errorCallbacks.get(moduleName).delete(onError);
          }
          if (typeof callback != 'undefined') {
            callback();
          }
        });
      },
      getModuleLibraries: null, // set up by _initializeTools
    };
 }
 let modulePaths = {};
 let customModulePaths = {};
 window.\$dartLoader.rootDirectories.push(window.location.origin + baseUrl);
 for (let moduleName of Object.getOwnPropertyNames(modulePaths)) {
   let modulePath = modulePaths[moduleName];
   if (modulePath != moduleName) {
     customModulePaths[moduleName] = modulePath;
   }
   var src = window.location.origin + '/' + modulePath + '.js';
   if (window.\$dartLoader.moduleIdToUrl.has(moduleName)) {
     continue;
   }
   \$dartLoader.moduleIdToUrl.set(moduleName, src);
   \$dartLoader.urlToModuleId.set(src, moduleName);
 }
 // Create the main module loaded below.
 define("main_module.bootstrap", ["$entrypoint", "dart_sdk"], function(app, dart_sdk) {
   dart_sdk.dart.setStartAsyncSynchronously(true);
   dart_sdk._debugger.registerDevtoolsFormatter();
   \$dartLoader.getModuleLibraries = dart_sdk.dart.getModuleLibraries;
   if (window.\$dartStackTraceUtility && !window.\$dartStackTraceUtility.ready) {
     window.\$dartStackTraceUtility.ready = true;
     let dart = dart_sdk.dart;
     window.\$dartStackTraceUtility.setSourceMapProvider(
       function(url) {
         url = url.replace(baseUrl, '/');
         var module = window.\$dartLoader.urlToModuleId.get(url);
         if (!module) {
           if (url.endsWith('dart_sdk.js')) {
             module = 'dart_sdk';
           } else {
             try {
               module = '/packages' + url.split('packages')[1].split('.')[0] + '.dart';
             } catch (e) {
               return null;
             }
           }
         }
         return dart.getSourceMap(module);
       });
   }
   if (typeof document != 'undefined') {
     window.postMessage({ type: "DDC_STATE_CHANGE", state: "start" }, "*");
   }
   dart_sdk._isolate_helper.startRootIsolate(() => {}, []);

   // See the generateMainModule doc comment.
   var child = {};
   child.main = app[Object.keys(app)[0]].main;
   if (window.\$hotReload == null) {
     window.\$hotReload = function(cb) {
       dart_sdk.developer.invokeExtension("ext.flutter.disassemble", "{}").then((_) => {
         dart_sdk.dart.hotRestart();
         window.\$dartRunMain();
         window.requestAnimationFrame(cb);
       });
     }
   }

   /* MAIN_EXTENSION_MARKER */
   child.main();
 });

 // Require JS configuration.
 require.config({
   waitSeconds: 0,
 });
 ''';
 }
	// Copyright 2014 The Flutter Authors. 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:meta/meta.dart';

	// This logic is taken directly from https://github.com/dart-lang/build/blob/master/build_web_compilers/lib/src/dev_compiler_bootstrap.dart#L272
	// It should be fairly stable, but is otherwise required to interact with the client.js script
	// vendored with DWDS.
	const String _currentDirectoryScript = r'''
	var _currentDirectory = (function () {
	var _url;
	var lines = new Error().stack.split('\n');
	function lookupUrl() {
	if (lines.length > 2) {
	var match = lines[1].match(/^\s+at (.+):\d+:\d+$/);
	// Chrome.
	if (match) return match[1];
	// Chrome nested eval case.
	match = lines[1].match(/^\s+at eval [(](.+):\d+:\d+[)]$/);
	if (match) return match[1];
	// Edge.
	match = lines[1].match(/^\s+at.+\((.+):\d+:\d+\)$/);
	if (match) return match[1];
	// Firefox.
	match = lines[0].match(/[<][@](.+):\d+:\d+$/)
	if (match) return match[1];
	}
	// Safari.
	return lines[0].match(/(.+):\d+:\d+$/)[1];
	}
	_url = lookupUrl();
	var lastSlash = _url.lastIndexOf('/');
	if (lastSlash == -1) return _url;
	var currentDirectory = _url.substring(0, lastSlash + 1);
	return currentDirectory;
	})();
	''';

	/// The JavaScript bootstrap script to support in-browser hot restart.
	///
	/// The [requireUrl] loads our cached RequireJS script file. The [mapperUrl]
	/// loads the special Dart stack trace mapper. The [entrypoint] is the
	/// actual main.dart file.
	///
	/// This file is served when the browser requests "main.dart.js" in debug mode,
	/// and is responsible for bootstrapping the RequireJS modules and attaching
	/// the hot reload hooks.
	String generateBootstrapScript({
	@required String requireUrl,
	@required String mapperUrl,
	@required String entrypoint,
	}) {
	return '''
	"use strict";

	// Attach source mapping.
	var mapperEl = document.createElement("script");
	mapperEl.defer = true;
	mapperEl.async = false;
	mapperEl.src = "$mapperUrl";
	document.head.appendChild(mapperEl);

	// Attach require JS.
	var requireEl = document.createElement("script");
	requireEl.defer = true;
	requireEl.async = false;
	requireEl.src = "$requireUrl";
	// This attribute tells require JS what to load as main (defined below).
	requireEl.setAttribute("data-main", "main_module.bootstrap");
	document.head.appendChild(requireEl);

	// Invoked by connected chrome debugger for hot reload/restart support.
	window.\$hotReloadHook = function(modules) {
	return new Promise(function(resolve, reject) {
	if (modules == null) {
	reject();
	}
	// If no modules change, return immediately.
	if (modules.length == 0) {
	resolve();
	}
	var reloadCount = 0;
	for (var i = 0; i < modules.length; i++) {
	require.undef(modules[i]);
	require([modules[i]], function(module) {
	reloadCount += 1;
	// once we've reloaded every module, trigger the hot reload.
	if (reloadCount == modules.length) {
	require(["$entrypoint", "dart_sdk"], function(app, dart_sdk) {
	// See the doc comment under in generateMainModule.
	window.\$dartRunMain = app[Object.keys(app)[0]].main;
	window.\$hotReload(resolve);
	});
	}
	});
	}
	});
	}
	''';
	}

	/// Generate a synthetic main module which captures the application's main
	/// method.
	///
	/// RE: Object.keys usage in app.main:
	/// This attaches the main entrypoint and hot reload functionality to the window.
	/// The app module will have a single property which contains the actual application
	/// code. The property name is based off of the entrypoint that is generated, for example
	/// the file `foo/bar/baz.dart` will generate a property named approximately
	/// `foo__bar__baz`. Rather than attempt to guess, we assume the first property of
	/// this object is the module.
	String generateMainModule({@required String entrypoint}) {
	return '''/* ENTRYPOINT_EXTENTION_MARKER */
	// baseUrlScript
	var baseUrl = (function () {
	// Attempt to detect --precompiled mode for tests, and set the base url
	// appropriately, otherwise set it to '/'.
	var pathParts = location.pathname.split("/");
	if (pathParts[0] == "") {
	pathParts.shift();
	}
	if (pathParts.length > 1 && pathParts[1] == "test") {
	return "/" + pathParts.slice(0, 2).join("/") + "/";
	}
	// Attempt to detect base url using <base href> html tag
	// base href should start and end with "/"
	if (typeof document !== 'undefined') {
	var el = document.getElementsByTagName('base');
	if (el && el[0] && el[0].getAttribute("href") && el[0].getAttribute
	("href").startsWith("/") && el[0].getAttribute("href").endsWith("/")){
	return el[0].getAttribute("href");
	}
	}
	// return default value
	return "/";
	}());
	$_currentDirectoryScript
	// dart loader
	if(!window.\$dartLoader) {
	window.\$dartLoader = {
	appDigests: _currentDirectory + 'basic.digests',
	moduleIdToUrl: new Map(),
	urlToModuleId: new Map(),
	rootDirectories: new Array(),
	// Used in package:build_runner/src/server/build_updates_client/hot_reload_client.dart
	moduleParentsGraph: new Map(),
	moduleLoadingErrorCallbacks: new Map(),
	forceLoadModule: function (moduleName, callback, onError) {
	if (typeof onError != 'undefined') {
	var errorCallbacks = \$dartLoader.moduleLoadingErrorCallbacks;
	if (!errorCallbacks.has(moduleName)) {
	errorCallbacks.set(moduleName, new Set());
	}
	errorCallbacks.get(moduleName).add(onError);
	}
	requirejs.undef(moduleName);
	requirejs([moduleName], function() {
	if (typeof onError != 'undefined') {
	errorCallbacks.get(moduleName).delete(onError);
	}
	if (typeof callback != 'undefined') {
	callback();
	}
	});
	},
	getModuleLibraries: null, // set up by _initializeTools
	};
	}
	let modulePaths = {};
	let customModulePaths = {};
	window.\$dartLoader.rootDirectories.push(window.location.origin + baseUrl);
	for (let moduleName of Object.getOwnPropertyNames(modulePaths)) {
	let modulePath = modulePaths[moduleName];
	if (modulePath != moduleName) {
	customModulePaths[moduleName] = modulePath;
	}
	var src = window.location.origin + '/' + modulePath + '.js';
	if (window.\$dartLoader.moduleIdToUrl.has(moduleName)) {
	continue;
	}
	\$dartLoader.moduleIdToUrl.set(moduleName, src);
	\$dartLoader.urlToModuleId.set(src, moduleName);
	}
	// Create the main module loaded below.
	define("main_module.bootstrap", ["$entrypoint", "dart_sdk"], function(app, dart_sdk) {
	dart_sdk.dart.setStartAsyncSynchronously(true);
	dart_sdk._debugger.registerDevtoolsFormatter();
	\$dartLoader.getModuleLibraries = dart_sdk.dart.getModuleLibraries;
	if (window.\$dartStackTraceUtility && !window.\$dartStackTraceUtility.ready) {
	window.\$dartStackTraceUtility.ready = true;
	let dart = dart_sdk.dart;
	window.\$dartStackTraceUtility.setSourceMapProvider(
	function(url) {
	url = url.replace(baseUrl, '/');
	var module = window.\$dartLoader.urlToModuleId.get(url);
	if (!module) {
	if (url.endsWith('dart_sdk.js')) {
	module = 'dart_sdk';
	} else {
	try {
	module = '/packages' + url.split('packages')[1].split('.')[0] + '.dart';
	} catch (e) {
	return null;
	}
	}
	}
	return dart.getSourceMap(module);
	});
	}
	if (typeof document != 'undefined') {
	window.postMessage({ type: "DDC_STATE_CHANGE", state: "start" }, "*");
	}
	dart_sdk._isolate_helper.startRootIsolate(() => {}, []);

	// See the generateMainModule doc comment.
	var child = {};
	child.main = app[Object.keys(app)[0]].main;
	if (window.\$hotReload == null) {
	window.\$hotReload = function(cb) {
	dart_sdk.developer.invokeExtension("ext.flutter.disassemble", "{}").then((_) => {
	dart_sdk.dart.hotRestart();
	window.\$dartRunMain();
	window.requestAnimationFrame(cb);
	});
	}
	}

	/* MAIN_EXTENSION_MARKER */
	child.main();
	});

	// Require JS configuration.
	require.config({
	waitSeconds: 0,
	});
	''';
	}