pkg/dev_compiler/web/web_command.dart - sdk - Git at Google

 // Copyright (c) 2016, 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.
 @JS()
 library dev_compiler.web.web_command;

 import 'dart:async';
 import 'dart:convert';
 import 'dart:math' as math;
 import 'dart:html' show HttpRequest;
 import 'dart:typed_data';

 import 'package:analyzer/file_system/file_system.dart' show ResourceUriResolver;
 import 'package:analyzer/file_system/memory_file_system.dart'
     show MemoryResourceProvider;
 import 'package:analyzer/src/summary/idl.dart' show PackageBundle;
 import 'package:analyzer/src/summary/package_bundle_reader.dart'
     show SummaryDataStore;
 import 'package:analyzer/src/dart/resolver/scope.dart' show Scope;

 import 'package:args/command_runner.dart';

 import 'package:dev_compiler/src/analyzer/context.dart' show AnalyzerOptions;
 import 'package:dev_compiler/src/analyzer/command.dart';
 import 'package:dev_compiler/src/analyzer/driver.dart';
 import 'package:dev_compiler/src/analyzer/module_compiler.dart';

 import 'package:dev_compiler/src/compiler/module_builder.dart';
 import 'package:js/js.dart';
 import 'package:path/path.dart' as path;

 typedef void MessageHandler(Object message);

 @JS()
 @anonymous
 class JSIterator<V> {}

 @JS('Map')
 class JSMap<K, V> {
   external V get(K v);
   external set(K k, V v);
   external JSIterator<K> keys();
   external JSIterator<V> values();
   external int get size;
 }

 @JS('Array.from')
 external List<V> iteratorToList<V>(JSIterator<V> iterator);

 @JS()
 @anonymous
 class CompileResult {
   external factory CompileResult(
       {String code, List<String> errors, bool isValid});
 }

 typedef CompileModule(String imports, String body, String libraryName,
     String existingLibrary, String fileName);

 /// The command for invoking the modular compiler.
 class WebCompileCommand extends Command {
   @override
   get name => 'compile';

   @override
   get description => 'Compile a set of Dart files into a JavaScript module.';
   final MessageHandler messageHandler;

   WebCompileCommand({MessageHandler messageHandler})
       : this.messageHandler = messageHandler ?? print {
     ddcArgParser(argParser: argParser, help: false);
   }

   @override
   Function run() {
     return requestSummaries;
   }

   Future<Null> requestSummaries(String sdkUrl, JSMap<String, String> summaryMap,
       Function onCompileReady, Function onError, Function onProgress) async {
     var sdkRequest;
     var progress = 0;
     // Add 1 to the count for the SDK summary.
     var total = summaryMap.size + 1;
     // No need to report after every  summary is loaded. Posting about 100
     // progress updates should be more than sufficient for users to understand
     // how long loading will take.
     num progressDelta = math.max(total / 100, 1);
     num nextProgressToReport = 0;
     maybeReportProgress() {
       if (nextProgressToReport > progress && progress != total) return;
       nextProgressToReport += progressDelta;
       if (onProgress != null) onProgress(progress, total);
     }

     try {
       sdkRequest = await HttpRequest.request(sdkUrl,
           responseType: "arraybuffer",
           mimeType: "application/octet-stream",
           withCredentials: true);
     } catch (error) {
       onError('Dart sdk summaries failed to load: $error. url: $sdkUrl');
       return null;
     }
     progress++;
     maybeReportProgress();

     var sdkBytes = (sdkRequest.response as ByteBuffer).asUint8List();

     // Map summary URLs to HttpRequests.

     var summaryRequests =
         iteratorToList(summaryMap.values()).map((String summaryUrl) async {
       var request = await HttpRequest.request(summaryUrl,
           responseType: "arraybuffer", mimeType: "application/octet-stream");
       progress++;
       maybeReportProgress();
       return request;
     }).toList();
     try {
       var summaryResponses = await Future.wait(summaryRequests);
       // Map summary responses to summary bytes.
       List<List<int>> summaryBytes = summaryResponses
           .map((response) => (response.response as ByteBuffer).asUint8List())
           .toList();
       onCompileReady(setUpCompile(
           sdkBytes, summaryBytes, iteratorToList(summaryMap.keys())));
     } catch (error) {
       onError('Summaries failed to load: $error');
     }
   }

   List<Function> setUpCompile(List<int> sdkBytes, List<List<int>> summaryBytes,
       List<String> moduleIds) {
     var dartSdkSummaryPath = '/dart-sdk/lib/_internal/web_sdk.sum';

     var resources = MemoryResourceProvider()
       ..newFileWithBytes(dartSdkSummaryPath, sdkBytes);

     var options = AnalyzerOptions.basic(
         dartSdkPath: '/dart-sdk', dartSdkSummaryPath: dartSdkSummaryPath);

     var summaryData = SummaryDataStore([], resourceProvider: resources);
     var compilerOptions = CompilerOptions.fromArguments(argResults);
     compilerOptions.replCompile = true;
     compilerOptions.libraryRoot = '/';
     for (var i = 0; i < summaryBytes.length; i++) {
       var bytes = summaryBytes[i];

       // Packages with no dart source files will have empty invalid summaries.
       if (bytes.length == 0) continue;

       var moduleId = moduleIds[i];
       var url = '/$moduleId.api.ds';
       summaryData.addBundle(url, PackageBundle.fromBuffer(bytes));
       compilerOptions.summaryModules[url] = moduleId;
     }
     options.analysisRoot = '/web-compile-root';
     options.fileResolvers = [ResourceUriResolver(resources)];
     options.resourceProvider = resources;

     var driver = CompilerAnalysisDriver(options, summaryData: summaryData);

     var resolveFn = (String url) {
       var packagePrefix = 'package:';
       var uri = Uri.parse(url);
       var base = path.basename(url);
       var parts = uri.pathSegments;
       var match = null;
       int bestScore = 0;
       for (var candidate in summaryData.uriToSummaryPath.keys) {
         if (path.basename(candidate) != base) continue;
         List<String> candidateParts = path.dirname(candidate).split('/');
         var first = candidateParts.first;

         // Process and strip "package:" prefix.
         if (first.startsWith(packagePrefix)) {
           first = first.substring(packagePrefix.length);
           candidateParts[0] = first;
           // Handle convention that directory foo/bar/baz is given package name
           // foo.bar.baz
           if (first.contains('.')) {
             candidateParts = (first.split('.'))..addAll(candidateParts.skip(1));
           }
         }

         // If file name and extension don't match... give up.
         int i = parts.length - 1;
         int j = candidateParts.length - 1;

         int score = 1;
         // Greedy algorithm finding matching path segments from right to left
         // skipping segments on the candidate path unless the target path
         // segment is named lib.
         while (i >= 0 && j >= 0) {
           if (parts[i] == candidateParts[j]) {
             i--;
             j--;
             score++;
             if (j == 0 && i == 0) {
               // Arbitrary bonus if we matched all parts of the input
               // and used up all parts of the output.
               score += 10;
             }
           } else {
             // skip unmatched lib directories from the input
             // otherwise skip unmatched parts of the candidate.
             if (parts[i] == 'lib') {
               i--;
             } else {
               j--;
             }
           }
         }

         if (score > bestScore) {
           match = candidate;
         }
       }
       return match;
     };

     CompileModule compileFn = (String imports, String body, String libraryName,
         String existingLibrary, String fileName) {
       // Instead of returning a single function, return a pair of functions.
       // Create a new virtual File that contains the given Dart source.
       String sourceCode;
       if (existingLibrary == null) {
         sourceCode = imports + body;
       } else {
         var dir = path.dirname(existingLibrary);
         // Need to pull in all the imports from the existing library and
         // re-export all privates as privates in this library.
         // Assumption: summaries are available for all libraries, including any
         // source files that were compiled; we do not need to reconstruct any
         // summary data here.
         var unlinked = driver.summaryData.unlinkedMap[existingLibrary];
         if (unlinked == null) {
           throw "Unable to get library element for `$existingLibrary`.";
         }
         var sb = StringBuffer(imports);
         sb.write('\n');

         // TODO(jacobr): we need to add a proper Analyzer flag specifing that
         // cross-library privates should be in scope instead of this hack.
         // We set the private name prefix for scope resolution to an invalid
         // character code so that the analyzer ignores normal Dart private
         // scoping rules for top level names allowing REPL users to access
         // privates in arbitrary libraries. The downside of this scheme is it is
         // possible to get errors if privates in the current library and
         // imported libraries happen to have exactly the same name.
         Scope.PRIVATE_NAME_PREFIX = -1;

         // We emulate running code in the context of an existing library by
         // importing that library and all libraries it imports.
         sb.write('import ${json.encode(existingLibrary)};\n');

         for (var import in unlinked.imports) {
           if (import.uri == null || import.isImplicit) continue;
           var uri = import.uri;
           // dart: and package: uris are not relative but the path package
           // thinks they are. We have to provide absolute uris as our library
           // has a different directory than the library we are pretending to be.
           if (path.isRelative(uri) &&
               !uri.startsWith('package:') &&
               !uri.startsWith('dart:')) {
             uri = path.normalize(path.join(dir, uri));
           }
           sb.write('import ${json.encode(uri)}');
           if (import.prefixReference != 0) {
             var prefix = unlinked.references[import.prefixReference].name;
             sb.write(' as $prefix');
           }
           for (var combinator in import.combinators) {
             if (combinator.shows.isNotEmpty) {
               sb.write(' show ${combinator.shows.join(', ')}');
             } else if (combinator.hides.isNotEmpty) {
               sb.write(' hide ${combinator.hides.join(', ')}');
             } else {
               throw 'Unexpected element combinator';
             }
           }
           sb.write(';\n');
         }
         sb.write(body);
         sourceCode = sb.toString();
       }
       resources.newFile(fileName, sourceCode);

       var name = path.toUri(libraryName).toString();
       compilerOptions.moduleName = name;
       JSModuleFile module =
           compileWithAnalyzer(driver, [fileName], options, compilerOptions);

       var moduleCode = '';
       if (module.isValid) {
         moduleCode =
             module.getCode(ModuleFormat.legacyConcat, name, name + '.map').code;
       }

       return CompileResult(
           code: moduleCode, isValid: module.isValid, errors: module.errors);
     };

     return [allowInterop(compileFn), allowInterop(resolveFn)];
   }
 }

 /// Thrown when the input source code has errors.
 class CompileErrorException implements Exception {
   @override
   toString() => '\nPlease fix all errors before compiling (warnings are okay).';
 }
	// Copyright (c) 2016, 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.
	@JS()
	library dev_compiler.web.web_command;

	import 'dart:async';
	import 'dart:convert';
	import 'dart:math' as math;
	import 'dart:html' show HttpRequest;
	import 'dart:typed_data';

	import 'package:analyzer/file_system/file_system.dart' show ResourceUriResolver;
	import 'package:analyzer/file_system/memory_file_system.dart'
	show MemoryResourceProvider;
	import 'package:analyzer/src/summary/idl.dart' show PackageBundle;
	import 'package:analyzer/src/summary/package_bundle_reader.dart'
	show SummaryDataStore;
	import 'package:analyzer/src/dart/resolver/scope.dart' show Scope;

	import 'package:args/command_runner.dart';

	import 'package:dev_compiler/src/analyzer/context.dart' show AnalyzerOptions;
	import 'package:dev_compiler/src/analyzer/command.dart';
	import 'package:dev_compiler/src/analyzer/driver.dart';
	import 'package:dev_compiler/src/analyzer/module_compiler.dart';

	import 'package:dev_compiler/src/compiler/module_builder.dart';
	import 'package:js/js.dart';
	import 'package:path/path.dart' as path;

	typedef void MessageHandler(Object message);

	@JS()
	@anonymous
	class JSIterator<V> {}

	@JS('Map')
	class JSMap<K, V> {
	external V get(K v);
	external set(K k, V v);
	external JSIterator<K> keys();
	external JSIterator<V> values();
	external int get size;
	}

	@JS('Array.from')
	external List<V> iteratorToList<V>(JSIterator<V> iterator);

	@JS()
	@anonymous
	class CompileResult {
	external factory CompileResult(
	{String code, List<String> errors, bool isValid});
	}

	typedef CompileModule(String imports, String body, String libraryName,
	String existingLibrary, String fileName);

	/// The command for invoking the modular compiler.
	class WebCompileCommand extends Command {
	@override
	get name => 'compile';

	@override
	get description => 'Compile a set of Dart files into a JavaScript module.';
	final MessageHandler messageHandler;

	WebCompileCommand({MessageHandler messageHandler})
	: this.messageHandler = messageHandler ?? print {
	ddcArgParser(argParser: argParser, help: false);
	}

	@override
	Function run() {
	return requestSummaries;
	}

	Future<Null> requestSummaries(String sdkUrl, JSMap<String, String> summaryMap,
	Function onCompileReady, Function onError, Function onProgress) async {
	var sdkRequest;
	var progress = 0;
	// Add 1 to the count for the SDK summary.
	var total = summaryMap.size + 1;
	// No need to report after every summary is loaded. Posting about 100
	// progress updates should be more than sufficient for users to understand
	// how long loading will take.
	num progressDelta = math.max(total / 100, 1);
	num nextProgressToReport = 0;
	maybeReportProgress() {
	if (nextProgressToReport > progress && progress != total) return;
	nextProgressToReport += progressDelta;
	if (onProgress != null) onProgress(progress, total);
	}

	try {
	sdkRequest = await HttpRequest.request(sdkUrl,
	responseType: "arraybuffer",
	mimeType: "application/octet-stream",
	withCredentials: true);
	} catch (error) {
	onError('Dart sdk summaries failed to load: $error. url: $sdkUrl');
	return null;
	}
	progress++;
	maybeReportProgress();

	var sdkBytes = (sdkRequest.response as ByteBuffer).asUint8List();

	// Map summary URLs to HttpRequests.

	var summaryRequests =
	iteratorToList(summaryMap.values()).map((String summaryUrl) async {
	var request = await HttpRequest.request(summaryUrl,
	responseType: "arraybuffer", mimeType: "application/octet-stream");
	progress++;
	maybeReportProgress();
	return request;
	}).toList();
	try {
	var summaryResponses = await Future.wait(summaryRequests);
	// Map summary responses to summary bytes.
	List<List<int>> summaryBytes = summaryResponses
	.map((response) => (response.response as ByteBuffer).asUint8List())
	.toList();
	onCompileReady(setUpCompile(
	sdkBytes, summaryBytes, iteratorToList(summaryMap.keys())));
	} catch (error) {
	onError('Summaries failed to load: $error');
	}
	}

	List<Function> setUpCompile(List<int> sdkBytes, List<List<int>> summaryBytes,
	List<String> moduleIds) {
	var dartSdkSummaryPath = '/dart-sdk/lib/_internal/web_sdk.sum';

	var resources = MemoryResourceProvider()
	..newFileWithBytes(dartSdkSummaryPath, sdkBytes);

	var options = AnalyzerOptions.basic(
	dartSdkPath: '/dart-sdk', dartSdkSummaryPath: dartSdkSummaryPath);

	var summaryData = SummaryDataStore([], resourceProvider: resources);
	var compilerOptions = CompilerOptions.fromArguments(argResults);
	compilerOptions.replCompile = true;
	compilerOptions.libraryRoot = '/';
	for (var i = 0; i < summaryBytes.length; i++) {
	var bytes = summaryBytes[i];

	// Packages with no dart source files will have empty invalid summaries.
	if (bytes.length == 0) continue;

	var moduleId = moduleIds[i];
	var url = '/$moduleId.api.ds';
	summaryData.addBundle(url, PackageBundle.fromBuffer(bytes));
	compilerOptions.summaryModules[url] = moduleId;
	}
	options.analysisRoot = '/web-compile-root';
	options.fileResolvers = [ResourceUriResolver(resources)];
	options.resourceProvider = resources;

	var driver = CompilerAnalysisDriver(options, summaryData: summaryData);

	var resolveFn = (String url) {
	var packagePrefix = 'package:';
	var uri = Uri.parse(url);
	var base = path.basename(url);
	var parts = uri.pathSegments;
	var match = null;
	int bestScore = 0;
	for (var candidate in summaryData.uriToSummaryPath.keys) {
	if (path.basename(candidate) != base) continue;
	List<String> candidateParts = path.dirname(candidate).split('/');
	var first = candidateParts.first;

	// Process and strip "package:" prefix.
	if (first.startsWith(packagePrefix)) {
	first = first.substring(packagePrefix.length);
	candidateParts[0] = first;
	// Handle convention that directory foo/bar/baz is given package name
	// foo.bar.baz
	if (first.contains('.')) {
	candidateParts = (first.split('.'))..addAll(candidateParts.skip(1));
	}
	}

	// If file name and extension don't match... give up.
	int i = parts.length - 1;
	int j = candidateParts.length - 1;

	int score = 1;
	// Greedy algorithm finding matching path segments from right to left
	// skipping segments on the candidate path unless the target path
	// segment is named lib.
	while (i >= 0 && j >= 0) {
	if (parts[i] == candidateParts[j]) {
	i--;
	j--;
	score++;
	if (j == 0 && i == 0) {
	// Arbitrary bonus if we matched all parts of the input
	// and used up all parts of the output.
	score += 10;
	}
	} else {
	// skip unmatched lib directories from the input
	// otherwise skip unmatched parts of the candidate.
	if (parts[i] == 'lib') {
	i--;
	} else {
	j--;
	}
	}
	}

	if (score > bestScore) {
	match = candidate;
	}
	}
	return match;
	};

	CompileModule compileFn = (String imports, String body, String libraryName,
	String existingLibrary, String fileName) {
	// Instead of returning a single function, return a pair of functions.
	// Create a new virtual File that contains the given Dart source.
	String sourceCode;
	if (existingLibrary == null) {
	sourceCode = imports + body;
	} else {
	var dir = path.dirname(existingLibrary);
	// Need to pull in all the imports from the existing library and
	// re-export all privates as privates in this library.
	// Assumption: summaries are available for all libraries, including any
	// source files that were compiled; we do not need to reconstruct any
	// summary data here.
	var unlinked = driver.summaryData.unlinkedMap[existingLibrary];
	if (unlinked == null) {
	throw "Unable to get library element for `$existingLibrary`.";
	}
	var sb = StringBuffer(imports);
	sb.write('\n');

	// TODO(jacobr): we need to add a proper Analyzer flag specifing that
	// cross-library privates should be in scope instead of this hack.
	// We set the private name prefix for scope resolution to an invalid
	// character code so that the analyzer ignores normal Dart private
	// scoping rules for top level names allowing REPL users to access
	// privates in arbitrary libraries. The downside of this scheme is it is
	// possible to get errors if privates in the current library and
	// imported libraries happen to have exactly the same name.
	Scope.PRIVATE_NAME_PREFIX = -1;

	// We emulate running code in the context of an existing library by
	// importing that library and all libraries it imports.
	sb.write('import ${json.encode(existingLibrary)};\n');

	for (var import in unlinked.imports) {
	if (import.uri == null \|\| import.isImplicit) continue;
	var uri = import.uri;
	// dart: and package: uris are not relative but the path package
	// thinks they are. We have to provide absolute uris as our library
	// has a different directory than the library we are pretending to be.
	if (path.isRelative(uri) &&
	!uri.startsWith('package:') &&
	!uri.startsWith('dart:')) {
	uri = path.normalize(path.join(dir, uri));
	}
	sb.write('import ${json.encode(uri)}');
	if (import.prefixReference != 0) {
	var prefix = unlinked.references[import.prefixReference].name;
	sb.write(' as $prefix');
	}
	for (var combinator in import.combinators) {
	if (combinator.shows.isNotEmpty) {
	sb.write(' show ${combinator.shows.join(', ')}');
	} else if (combinator.hides.isNotEmpty) {
	sb.write(' hide ${combinator.hides.join(', ')}');
	} else {
	throw 'Unexpected element combinator';
	}
	}
	sb.write(';\n');
	}
	sb.write(body);
	sourceCode = sb.toString();
	}
	resources.newFile(fileName, sourceCode);

	var name = path.toUri(libraryName).toString();
	compilerOptions.moduleName = name;
	JSModuleFile module =
	compileWithAnalyzer(driver, [fileName], options, compilerOptions);

	var moduleCode = '';
	if (module.isValid) {
	moduleCode =
	module.getCode(ModuleFormat.legacyConcat, name, name + '.map').code;
	}

	return CompileResult(
	code: moduleCode, isValid: module.isValid, errors: module.errors);
	};

	return [allowInterop(compileFn), allowInterop(resolveFn)];
	}
	}

	/// Thrown when the input source code has errors.
	class CompileErrorException implements Exception {
	@override
	toString() => '\nPlease fix all errors before compiling (warnings are okay).';
	}