move polymer.dart into dart svn

pkg/polymer/lib/src/emitters.dart

+// Copyright (c) 2012, 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.
+
+/** Collects several code emitters for the template tool. */
+library emitters;
+
+import 'package:html5lib/dom.dart';
+import 'package:html5lib/dom_parsing.dart' show TreeVisitor;
+import 'package:html5lib/parser.dart' show parseFragment;
+import 'package:source_maps/printer.dart';
+import 'package:source_maps/refactor.dart';
+
+import 'compiler_options.dart';
+import 'css_emitters.dart' show emitStyleSheet, emitOriginalCss;
+import 'html5_utils.dart';
+import 'info.dart' show ComponentInfo, FileInfo, GlobalInfo;
+import 'messages.dart';
+import 'paths.dart' show PathMapper;
+import 'utils.dart' show escapeDartString, path;
+
+/** Generates the class corresponding to a single web component. */
+NestedPrinter emitPolymerElement(ComponentInfo info, PathMapper pathMapper,
+    TextEditTransaction transaction, CompilerOptions options) {
+  if (info.classDeclaration == null) return null;
+
+  var codeInfo = info.userCode;
+  if (transaction == null) {
+    // TODO(sigmund): avoid emitting this file if we don't need to do any
+    // modifications (e.g. no @observable and not adding the libraryName).
+    transaction = new TextEditTransaction(codeInfo.code, codeInfo.sourceFile);
+  }
+  if (codeInfo.libraryName == null) {
+    // For deploy, we need to import the library associated with the component,
+    // so we need to ensure there is a library directive.
+    var libraryName = info.tagName.replaceAll(new RegExp('[-./]'), '_');
+    transaction.edit(0, 0, 'library $libraryName;');
+  }
+  return transaction.commit();
+}
+
+/** The code that will be used to bootstrap the application. */
+NestedPrinter generateBootstrapCode(
+    FileInfo info, FileInfo userMainInfo, GlobalInfo global,
+    PathMapper pathMapper, CompilerOptions options) {
+
+  var printer = new NestedPrinter(0)
+      ..addLine('library app_bootstrap;')
+      ..addLine('')
+      ..addLine("import 'package:polymer/polymer.dart';")
+      ..addLine("import 'dart:mirrors' show currentMirrorSystem;");
+  if (userMainInfo.userCode != null) {
+    printer..addLine("import '${pathMapper.importUrlFor(info, userMainInfo)}' "
+        "as userMain;\n");
+  }
+
+  int i = 0;
+  for (var c in global.components.values) {
+    if (c.hasConflict) continue;
+    printer.addLine("import '${pathMapper.importUrlFor(info, c)}' as i$i;");
+    i++;
+  }
+
+  printer..addLine('')
+      ..addLine('void main() {')
+      ..indent += 1
+      ..addLine("initPolymer([")
+      ..indent += 2;
+
+  for (var c in global.components.values) {
+    if (c.hasConflict) continue;
+    printer.addLine("'${pathMapper.importUrlFor(info, c)}',");
+  }
+
+  return printer
+      ..indent -= 1
+      ..addLine('],')
+      ..addLine(userMainInfo.userCode != null ? 'userMain.main,' : '() {},')
+      ..addLine(
+          "currentMirrorSystem().findLibrary(const Symbol('app_bootstrap'))")
+      ..indent += 2
+      ..addLine(".first.uri.toString());")
+      ..indent -= 4
+      ..addLine('}');
+}
+
+
+/**
+ * Rewrites attributes that contain relative URL (excluding src urls in script
+ * and link tags which are already rewritten by other parts of the compiler).
+*/
+class _AttributeUrlTransform extends TreeVisitor {
+  final String filePath;
+  final PathMapper pathMapper;
+
+  _AttributeUrlTransform(this.filePath, this.pathMapper);
+
+  visitElement(Element node) {
+    if (node.tagName == 'script') return;
+    if (node.tagName == 'link') return;
+
+    for (var key in node.attributes.keys) {
+      if (urlAttributes.contains(key)) {
+        node.attributes[key] =
+            pathMapper.transformUrl(filePath, node.attributes[key]);
+      }
+    }
+    super.visitElement(node);
+  }
+}
+
+final _shadowDomJS = new RegExp(r'shadowdom\..*\.js', caseSensitive: false);
+final _bootJS = new RegExp(r'.*/polymer/boot.js', caseSensitive: false);
+
+/** Trim down the html for the main html page. */
+void transformMainHtml(Document document, FileInfo fileInfo,
+    PathMapper pathMapper, bool hasCss, bool rewriteUrls,
+    Messages messages, GlobalInfo global, String bootstrapOutName) {
+  var filePath = fileInfo.inputUrl.resolvedPath;
+
+  var dartLoaderTag = null;
+  bool shadowDomFound = false;
+  for (var tag in document.queryAll('script')) {
+    var src = tag.attributes['src'];
+    if (src != null) {
+      var last = src.split('/').last;
+      if (last == 'dart.js' || last == 'testing.js') {
+        dartLoaderTag = tag;
+      } else if (_shadowDomJS.hasMatch(last)) {
+        shadowDomFound = true;
+      }
+    }
+    if (tag.attributes['type'] == 'application/dart') {
+      tag.remove();
+    } else if (src != null) {
+      if (_bootJS.hasMatch(src)) {
+        tag.remove();
+      } else if (rewriteUrls) {
+        tag.attributes["src"] = pathMapper.transformUrl(filePath, src);
+      }
+    }
+  }
+
+  for (var tag in document.queryAll('link')) {
+    var href = tag.attributes['href'];
+    var rel = tag.attributes['rel'];
+    if (rel == 'component' || rel == 'components' || rel == 'import') {
+      tag.remove();
+    } else if (href != null && rewriteUrls && !hasCss) {
+      // Only rewrite URL if rewrite on and we're not CSS polyfilling.
+      tag.attributes['href'] = pathMapper.transformUrl(filePath, href);
+    }
+  }
+
+  if (rewriteUrls) {
+    // Transform any element's attribute which is a relative URL.
+    new _AttributeUrlTransform(filePath, pathMapper).visit(document);
+  }
+
+  if (hasCss) {
+    var newCss = pathMapper.mangle(path.basename(filePath), '.css', true);
+    var linkElem = new Element.html(
+        '<link rel="stylesheet" type="text/css" href="$newCss">');
+    document.head.insertBefore(linkElem, null);
+  }
+
+  var styles = document.queryAll('style');
+  if (styles.length > 0) {
+    var allCss = new StringBuffer();
+    fileInfo.styleSheets.forEach((styleSheet) =>
+        allCss.write(emitStyleSheet(styleSheet, fileInfo)));
+    styles[0].nodes.clear();
+    styles[0].nodes.add(new Text(allCss.toString()));
+    for (var i = styles.length - 1; i > 0 ; i--) {
+      styles[i].remove();
+    }
+  }
+
+  // TODO(jmesserly): put this in the global CSS file?
+  // http://dvcs.w3.org/hg/webcomponents/raw-file/tip/spec/templates/index.html#css-additions
+  document.head.nodes.insert(0, parseFragment(
+      '<style>template { display: none; }</style>'));
+
+  // Move all <element> declarations to the main HTML file
+  // TODO(sigmund): remove this once we have HTMLImports implemented.
+  for (var c in global.components.values) {
+    document.body.nodes.insert(0, new Text('\n'));
+    var fragment = c.element;
+    for (var tag in fragment.queryAll('script')) {
+      // TODO(sigmund): leave script tags around when we start using "boot.js"
+      if (tag.attributes['type'] == 'application/dart') {
+        tag.remove();
+      }
+    }
+    document.body.nodes.insert(0, fragment);
+  }
+
+  if (!shadowDomFound) {
+    // TODO(jmesserly): we probably shouldn't add this automatically.
+    document.body.nodes.add(parseFragment('<script type="text/javascript" '
+        'src="packages/shadow_dom/shadow_dom.debug.js"></script>\n'));
+
+    // JS interop code required for Polymer CSS shimming.
+    document.body.nodes.add(parseFragment('<script type="text/javascript" '
+        'src="packages/browser/interop.js"></script>\n'));
+  }
+
+  var bootstrapScript = parseFragment(
+        '<script type="application/dart" src="$bootstrapOutName"></script>');
+  if (dartLoaderTag == null) {
+    document.body.nodes.add(bootstrapScript);
+    // TODO(jmesserly): turn this warning on.
+    //messages.warning('Missing script to load Dart. '
+    //    'Please add this line to your HTML file: $dartLoader',
+    //    document.body.sourceSpan);
+    // TODO(sigmund): switch to 'boot.js'
+    document.body.nodes.add(parseFragment('<script type="text/javascript" '
+        'src="packages/browser/dart.js"></script>\n'));
+  } else if (dartLoaderTag.parent != document.body) {
+    document.body.nodes.add(bootstrapScript);
+  } else {
+    document.body.insertBefore(bootstrapScript, dartLoaderTag);
+  }
+
+  // Insert the "auto-generated" comment after the doctype, otherwise IE will
+  // go into quirks mode.
+  int commentIndex = 0;
+  DocumentType doctype =
+      document.nodes.firstWhere((n) => n is DocumentType, orElse: () => null);
+  if (doctype != null) {
+    commentIndex = document.nodes.indexOf(doctype) + 1;
+    // TODO(jmesserly): the html5lib parser emits a warning for missing
+    // doctype, but it allows you to put it after comments. Presumably they do
+    // this because some comments won't force IE into quirks mode (sigh). See
+    // this link for more info:
+    //     http://bugzilla.validator.nu/show_bug.cgi?id=836
+    // For simplicity we emit the warning always, like validator.nu does.
+    if (doctype.tagName != 'html' || commentIndex != 1) {
+      messages.warning('file should start with <!DOCTYPE html> '
+          'to avoid the possibility of it being parsed in quirks mode in IE. '
+          'See http://www.w3.org/TR/html5-diff/#doctype', doctype.sourceSpan);
+    }
+  }
+  document.nodes.insert(commentIndex, parseFragment(
+      '\n<!-- This file was auto-generated from $filePath. -->\n'));
+}