Linter Demo

Errors: 3

Warnings: 2

File: /home/fstrocco/Dart/dart/benchmark/devcompiler/lib/src/codegen/html_codegen.dart

// Copyright (c) 2015, 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. library dev_compiler.src.codegen.html_codegen; import 'package:html/dom.dart'; import 'package:html/parser.dart' show parseFragment; import 'package:logging/logging.dart' show Logger; import 'package:path/path.dart' as path; import 'package:dev_compiler/src/dependency_graph.dart'; import 'package:dev_compiler/src/options.dart'; import 'package:dev_compiler/src/utils.dart' show colorOf, resourceOutputPath; import 'js_codegen.dart' show jsOutputPath, jsOutputBase; /// Emits an entry point HTML file corresponding to [inputFile] that can load /// the code generated by the dev compiler. /// /// This internally transforms the given HTML [document]. When compiling to /// JavaScript, we remove any Dart script tags, add new script tags to load our /// runtime and the compiled code, and to execute the main method of the /// application. When compiling to Dart, we ensure that the document contains a /// single Dart script tag, but otherwise emit the original document /// unmodified. String generateEntryHtml(HtmlSourceNode root, CompilerOptions options) { var document = root.document.clone(true); var scripts = document.querySelectorAll('script[type="application/dart"]'); if (scripts.isEmpty) { _log.warning('No <script type="application/dart"> found in ${root.uri}'); return '${document.outerHtml}\n'; } scripts.skip(1).forEach((s) { // TODO(sigmund): allow more than one Dart script tags? _log.warning(s.sourceSpan.message( 'unexpected script. Only one Dart script tag allowed ' '(see https://github.com/dart-lang/dart-dev-compiler/issues/53).', color: options.useColors ? colorOf('warning') : false)); s.remove(); }); var libraries = []; var resources = new Set(); visitInPostOrder(root, (n) { if (n is DartSourceNode) libraries.add(n); if (n is ResourceSourceNode) resources.add(n); }, includeParts: false); root.htmlResourceNodes.forEach((element, resource) { // Make sure we don't try and add this node again. resources.remove(resource); var resourcePath = resourceOutputPath(resource.uri, root.uri); if (resource.cachingHash != null) { resourcePath = _addHash(resourcePath, resource.cachingHash); } var attrs = element.attributes; if (attrs.containsKey('href')) { attrs['href'] = resourcePath; } else if (attrs.containsKey('src')) { attrs['src'] = resourcePath; } }); var fragment = new DocumentFragment(); for (var resource in resources) { var resourcePath = resourceOutputPath(resource.uri, root.uri); var ext = path.extension(resourcePath); if (resource.cachingHash != null) { resourcePath = _addHash(resourcePath, resource.cachingHash); } if (ext == '.js') { fragment.nodes.add(_libraryInclude(resourcePath)); } else if (ext == '.css') { var stylesheetLink = '<link rel="stylesheet" href="$resourcePath">\n'; fragment.nodes.add(parseFragment(stylesheetLink)); } } String mainLibraryName; for (var lib in libraries) { var info = lib.info; if (info == null) continue; var jsPath = jsOutputPath(info.library, root.uri); if (info.isEntry) mainLibraryName = jsOutputBase(info.library, root.uri); if (lib.cachingHash != null) { jsPath = _addHash(jsPath, lib.cachingHash); } fragment.nodes.add(_libraryInclude(jsPath)); } fragment.nodes.add(_invokeMain(mainLibraryName)); scripts[0].replaceWith(fragment); return '${document.outerHtml}\n'; } /// A script tag that loads the .js code for a compiled library. Node _libraryInclude(String jsUrl) => parseFragment('<script src="$jsUrl"></script>\n'); /// A script tag that invokes the main function on the entry point library. Node _invokeMain(String mainLibraryName) { var code = mainLibraryName == null ? 'console.error("dev_compiler error: main was not generated");' // TODO(vsm): Can we simplify this? // See: https://github.com/dart-lang/dev_compiler/issues/164 : "dart.start('$mainLibraryName');"; return parseFragment('<script>$code</script>\n'); } /// Convert the outputPath to include the hash in it. This function is the /// reverse of what the server does to determine whether a request needs to have /// cache headers added to it. _addHash(String outPath, String hash) { // (the ____ prefix makes it look better in the web inspector) return '$outPath?____cached=$hash'; } final _log = new Logger('dev_compiler.src.codegen.html_codegen');