Adding some asset-related utilities to code_transformers

pkg/polymer/lib/src/build/import_inliner.dart

 // Copyright (c) 2013, 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.
 
 /// Transfomer that inlines polymer-element definitions from html imports.
 library polymer.src.build.import_inliner;
 
 import 'dart:async';
 import 'dart:convert';
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:barback/barback.dart';
+import 'package:code_transformers/assets.dart';
 import 'package:path/path.dart' as path;
 import 'package:html5lib/dom.dart' show
     Document, DocumentFragment, Element, Node;
 import 'package:html5lib/dom_parsing.dart' show TreeVisitor;
 import 'package:source_maps/refactor.dart' show TextEditTransaction;
 import 'package:source_maps/span.dart';
 
 import 'common.dart';
 
 class _HtmlInliner extends PolymerTransformer {
@@ skipping 50 matching lines @@
 
     _moveHeadToBody(document);
 
     // Note: we need to preserve the import order in the generated output.
     return Future.forEach(document.querySelectorAll('link'), (Element tag) {
       var rel = tag.attributes['rel'];
       if (rel != 'import' && rel != 'stylesheet') return null;
 
       // Note: URL has already been normalized so use docId.
       var href = tag.attributes['href'];
-      var id = resolve(docId, href, transform.logger, tag.sourceSpan,
-          allowAbsolute: rel == 'stylesheet');
+      var id = uriToAssetId(docId, href, transform.logger, tag.sourceSpan,
+          errorOnAbsolute: rel != 'stylesheet');
 
       if (rel == 'import') {
         changed = true;
         if (id == null || !seen.add(id)) {
           tag.remove();
           return null;
         }
         return _inlineImport(id, tag);
 
       } else if (rel == 'stylesheet') {
@@ skipping 60 matching lines @@
   /// Remove scripts from HTML imports, and remember their [AssetId]s for later
   /// use.
   ///
   /// Dartium only allows a single script tag per page, so we can't inline
   /// the script tags. Instead we remove them entirely.
   void _removeScripts(Document doc) {
     for (var script in doc.querySelectorAll('script')) {
       if (script.attributes['type'] == TYPE_DART) {
         script.remove();
         var src = script.attributes['src'];
-        scriptIds.add(resolve(docId, src, logger, script.sourceSpan));
+        scriptIds.add(uriToAssetId(docId, src, logger, script.sourceSpan));
 
         // only the first script needs to be added.
         // others are already removed by _extractScripts
         return;
       }
     }
   }
 
   /// Split inline scripts into their own files. We need to do this for dart2js
   /// to be able to compile them.
@@ skipping 135 matching lines @@
   String visitInlineDart(String code) {
     var unit = parseCompilationUnit(code);
     var file = new SourceFile.text(spanUrlFor(sourceId, transform), code);
     var output = new TextEditTransaction(code, file);
 
     for (Directive directive in unit.directives) {
       if (directive is UriBasedDirective) {
         var uri = directive.uri.stringValue;
         var span = _getSpan(file, directive.uri);
 
-        var id = resolve(sourceId, uri, transform.logger, span,
-            allowAbsolute: true);
+        var id = uriToAssetId(sourceId, uri, transform.logger, span,
+            errorOnAbsolute: false);
         if (id == null) continue;
 
         var primaryId = transform.primaryInput.id;
         var newUri = assetUrlFor(id, primaryId, transform.logger);
         if (newUri != uri) {
           output.edit(span.start.offset, span.end.offset, "'$newUri'");
         }
       }
     }
 
     if (!output.hasEdits) return code;
 
     // TODO(sigmund): emit source maps when barback supports it (see
     // dartbug.com/12340)
     return (output.commit()..build(file.url)).text;
   }
 
   String _newUrl(String href, Span span) {
     var uri = Uri.parse(href);
     if (uri.isAbsolute) return href;
     if (!uri.scheme.isEmpty) return href;
     if (!uri.host.isEmpty) return href;
     if (uri.path.isEmpty) return href;  // Implies standalone ? or # in URI.
     if (path.isAbsolute(href)) return href;
 
-    var id = resolve(sourceId, href, transform.logger, span);
+    var id = uriToAssetId(sourceId, href, transform.logger, span);
     if (id == null) return href;
     var primaryId = transform.primaryInput.id;
 
     if (id.path.startsWith('lib/')) {
       return 'packages/${id.package}/${id.path.substring(4)}';
     }
 
     if (id.path.startsWith('asset/')) {
       return 'assets/${id.package}/${id.path.substring(6)}';
     }
@@ skipping 24 matching lines @@
   'formaction', // in button, input
   'href',       // in a, area, link, base, command
   'icon',       // in command
   'manifest',   // in html
   'poster',     // in video
   'src',        // in audio, embed, iframe, img, input, script, source, track,
                 //    video
 ];
 
 _getSpan(SourceFile file, AstNode node) => file.span(node.offset, node.end);