Roll Observatory packages and add a roll script

web_components/lib/build/script_compactor.dart

Index: web_components/lib/build/script_compactor.dart
diff --git a/web_components/lib/build/script_compactor.dart b/web_components/lib/build/script_compactor.dart
deleted file mode 100644
index 12655b3e5870b6ec9fcc26b78fec78a129195ce1..0000000000000000000000000000000000000000
--- a/web_components/lib/build/script_compactor.dart
+++ /dev/null
@@ -1,261 +0,0 @@
-// 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 web_components.build.script_compactor;
-
-import 'dart:async';
-import 'package:analyzer/analyzer.dart';
-import 'package:barback/barback.dart';
-import 'package:code_transformers/assets.dart';
-import 'package:code_transformers/messages/build_logger.dart';
-import 'package:html/dom.dart' as dom;
-import 'package:html/parser.dart' as parser;
-import 'package:path/path.dart' as path;
-import 'package:source_maps/refactor.dart' show TextEditTransaction;
-import 'package:source_span/source_span.dart';
-import 'common.dart';
-import 'import_crawler.dart';
-import 'messages.dart';
-
-/// Transformer which combines all dart scripts found in html imports into one
-/// new bootstrap file, and replaces the old entry point script with that file.
-///
-/// Note: Does not delete the original script files (it can't because the
-/// imports may live in other packages). The [ImportInlinerTransformer] will not
-/// copy scripts when inlining imports into your entry point to compensate for
-/// this.
-class ScriptCompactorTransformer extends Transformer {
-  final List<String> entryPoints;
-
-  ScriptCompactorTransformer([this.entryPoints]);
-
-  bool isPrimary(AssetId id) {
-    if (entryPoints != null) return entryPoints.contains(id.path);
-    // If no entry point is supplied, then any html file under web/ or test/ is
-    // an entry point.
-    return (id.path.startsWith('web/') || id.path.startsWith('test/')) &&
-        id.path.endsWith('.html');
-  }
-
-  apply(Transform transform) {
-    var logger = new BuildLogger(transform);
-    return new ScriptCompactor(transform, transform.primaryInput.id, logger)
-        .run()
-        .then((Asset bootstrap) {
-      if (bootstrap == null) return null;
-      return transform.primaryInput.readAsString().then((html) {
-        var doc = parser.parse(html);
-        var mainScriptTag = doc.querySelector('script[type="$dartType"]');
-        mainScriptTag.attributes['src'] =
-            _importPath(bootstrap.id, transform.primaryInput.id);
-        mainScriptTag.text = '';
-
-        transform.addOutput(
-            new Asset.fromString(transform.primaryInput.id, doc.outerHtml));
-      });
-    });
-  }
-}
-
-/// Helper class which does all the script compacting for a single entry point.
-class ScriptCompactor {
-  /// Can be an AggregateTransform or Transform
-  final transform;
-
-  /// The primary input to start from.
-  final AssetId primaryInput;
-
-  /// The logger to use.
-  final BuildLogger logger;
-
-  /// How many inline scripts were extracted.
-  int inlineScriptCounter = 0;
-
-  /// Id representing the dart script which lives in the primaryInput.
-  AssetId mainScript;
-
-  /// Ids of all the scripts found in html imports.
-  final Set<AssetId> importScripts = new Set<AssetId>();
-
-  ScriptCompactor(this.transform, this.primaryInput, this.logger);
-
-  Future<Asset> run() {
-    var crawler = new ImportCrawler(transform, primaryInput, logger);
-    return crawler.crawlImports().then((imports) {
-      Future extractScripts(id) =>
-          _extractInlineScripts(id, imports[id].document);
-
-      return Future.forEach(imports.keys, extractScripts).then((_) {
-        if (mainScript == null) {
-          logger.error(
-              exactlyOneScriptPerEntryPoint.create({'url': primaryInput.path}));
-          return null;
-        }
-
-        var primaryDocument = imports[primaryInput].document;
-        assert(primaryDocument != null);
-
-        // Create the new bootstrap file and return its AssetId.
-        return _buildBootstrapFile(mainScript, importScripts);
-      });
-    });
-  }
-
-  /// Builds the bootstrap file and returns the path to it relative to
-  /// [primaryInput].
-  Asset _buildBootstrapFile(AssetId mainScript, Set<AssetId> importScripts) {
-    var bootstrapId = new AssetId(primaryInput.package,
-        primaryInput.path.replaceFirst('.html', '.bootstrap.dart'));
-
-    var buffer = new StringBuffer();
-    buffer.writeln('library ${_libraryNameFor(bootstrapId)};');
-    buffer.writeln();
-    var i = 0;
-    for (var script in importScripts) {
-      var path = _importPath(script, primaryInput);
-      buffer.writeln("import '$path' as i$i;");
-      i++;
-    }
-    var mainScriptPath = _importPath(mainScript, primaryInput);
-    buffer.writeln("import '$mainScriptPath' as i$i;");
-    buffer.writeln();
-    buffer.writeln('main() => i$i.main();');
-
-    var bootstrap = new Asset.fromString(bootstrapId, '$buffer');
-    transform.addOutput(bootstrap);
-    return bootstrap;
-  }
-
-  /// Split inline scripts into their own files. We need to do this for dart2js
-  /// to be able to compile them.
-  ///
-  /// This also validates that there weren't any duplicate scripts.
-  Future _extractInlineScripts(AssetId asset, dom.Document doc) {
-    var scripts = doc.querySelectorAll('script[type="$dartType"]');
-    return Future.forEach(scripts, (script) {
-      var type = script.attributes['type'];
-      var src = script.attributes['src'];
-
-      if (src != null) {
-        return _addScript(
-            asset, uriToAssetId(asset, src, logger, script.sourceSpan),
-            span: script.sourceSpan);
-      }
-
-      final count = inlineScriptCounter++;
-      var code = script.text;
-      // TODO(sigmund): ensure this path is unique (dartbug.com/12618).
-      var newId = primaryInput.addExtension('.$count.dart');
-      if (!_hasLibraryDirective(code)) {
-        var libName = _libraryNameFor(primaryInput, count);
-        code = "library $libName;\n$code";
-      }
-
-      // Normalize dart import paths.
-      code = _normalizeDartImports(code, asset, primaryInput);
-
-      // Write out the file and record it.
-      transform.addOutput(new Asset.fromString(newId, code));
-
-      return _addScript(asset, newId, validate: false).then((_) {
-        // If in the entry point, replace the inline script with one pointing to
-        // the new source file.
-        if (primaryInput == asset) {
-          script.text = '';
-          script.attributes['src'] = path.url.relative(newId.path,
-              from: path.url.dirname(primaryInput.path));
-        }
-      });
-    });
-  }
-
-  // Normalize dart import paths when moving code from one asset to another.
-  String _normalizeDartImports(String code, AssetId from, AssetId to) {
-    var unit = parseDirectives(code, suppressErrors: true);
-    var file = new SourceFile(code, url: spanUrlFor(from, to, logger));
-    var output = new TextEditTransaction(code, file);
-    var foundLibraryDirective = false;
-    for (Directive directive in unit.directives) {
-      if (directive is UriBasedDirective) {
-        var uri = directive.uri.stringValue;
-        var span = getSpan(file, directive.uri);
-
-        var id = uriToAssetId(from, uri, logger, span, errorOnAbsolute: false);
-        if (id == null) continue;
-
-        var primaryId = primaryInput;
-        var newUri = assetUrlFor(id, primaryId, logger);
-        if (newUri != uri) {
-          output.edit(span.start.offset, span.end.offset, "'$newUri'");
-        }
-      } else if (directive is LibraryDirective) {
-        foundLibraryDirective = true;
-      }
-    }
-
-    if (!output.hasEdits) return code;
-
-    // TODO(sigmund): emit source maps when barback supports it (see
-    // dartbug.com/12340)
-    return (output.commit()..build(file.url.toString())).text;
-  }
-
-  Future _addScript(AssetId from, AssetId scriptId,
-      {bool validate: true, SourceSpan span}) {
-    var validateFuture;
-    if (validate && !importScripts.contains(scriptId)) {
-      validateFuture = transform.hasInput(scriptId);
-    } else {
-      validateFuture = new Future.value(true);
-    }
-    return validateFuture.then((exists) {
-      if (!exists) {
-        logger.warning(scriptFileNotFound.create({'url': scriptId}),
-            span: span);
-      }
-
-      if (from == primaryInput) {
-        if (mainScript != null) {
-          logger
-              .error(exactlyOneScriptPerEntryPoint.create({'url': from.path}));
-        }
-        mainScript = scriptId;
-      } else {
-        importScripts.add(scriptId);
-      }
-    });
-  }
-}
-
-/// Generate a library name for an asset.
-String _libraryNameFor(AssetId id, [int suffix]) {
-  var name = '${path.withoutExtension(id.path)}_'
-      '${path.extension(id.path).substring(1)}';
-  if (name.startsWith('lib/')) name = name.substring(4);
-  name = name.split('/').map((part) {
-    part = part.replaceAll(_invalidLibCharsRegex, '_');
-    if (part.startsWith(_numRegex)) part = '_${part}';
-    return part;
-  }).join(".");
-  var suffixString = suffix != null ? '_$suffix' : '';
-  return '${id.package}.${name}$suffixString';
-}
-
-/// Parse [code] and determine whether it has a library directive.
-bool _hasLibraryDirective(String code) =>
-    parseDirectives(code, suppressErrors: true).directives
-        .any((d) => d is LibraryDirective);
-
-/// Returns the dart import path to reach [id] relative to [primaryInput].
-String _importPath(AssetId id, AssetId primaryInput) {
-  var parts = path.url.split(id.path);
-  if (parts[0] == 'lib') {
-    parts[0] = id.package;
-    return 'package:${path.url.joinAll(parts)}';
-  }
-  return path.url.relative(id.path, from: path.url.dirname(primaryInput.path));
-}
-
-// Constant and final variables
-final _invalidLibCharsRegex = new RegExp('[^a-z0-9_]');
-final _numRegex = new RegExp('[0-9]');