utils/apidoc/apidoc.dart - sdk.git - Git at Google

 // 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.

 /**
  * This generates the reference documentation for the core libraries that come
  * with dart. It is built on top of dartdoc, which is a general-purpose library
  * for generating docs from any Dart code. This library extends that to include
  * additional information and styling specific to our standard library.
  *
  * Usage:
  *
  *     $ dart apidoc.dart [--out=<output directory>]
  */
 library apidoc;

 import 'dart:async';
 import 'dart:io';
 import 'dart:json' as json;

 import 'html_diff.dart';

 // TODO(rnystrom): Use "package:" URL (#4968).
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
 import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart';
 import '../../sdk/lib/_internal/dartdoc/lib/dartdoc.dart';
 import '../../sdk/lib/_internal/libraries.dart';

 HtmlDiff _diff;

 void main() {
   final args = new Options().arguments;

   int mode = MODE_STATIC;
   Path outputDir = new Path('docs');
   bool generateAppCache = false;

   List<String> excludedLibraries = <String>[];
   List<String> includedLibraries = <String>[];
   Path pkgPath;
   String version;

   // Parse the command-line arguments.
   for (int i = 0; i < args.length; i++) {
     final arg = args[i];

     switch (arg) {
       case '--mode=static':
         mode = MODE_STATIC;
         break;

       case '--mode=live-nav':
         mode = MODE_LIVE_NAV;
         break;

       case '--generate-app-cache=true':
         generateAppCache = true;
         break;

       default:
         if (arg.startsWith('--exclude-lib=')) {
           excludedLibraries.add(arg.substring('--exclude-lib='.length));
         } else if (arg.startsWith('--include-lib=')) {
           includedLibraries.add(arg.substring('--include-lib='.length));
         } else if (arg.startsWith('--out=')) {
           outputDir = new Path(arg.substring('--out='.length));
         } else if (arg.startsWith('--pkg=')) {
           pkgPath = new Path(arg.substring('--pkg='.length));
         } else if (arg.startsWith('--version=')) {
           version = arg.substring('--version='.length);
         } else {
           print('Unknown option: $arg');
           return;
         }
         break;
     }
   }

   final libPath = scriptDir.append('../../sdk/');

   cleanOutputDirectory(outputDir);

   print('Copying static files...');
   // The basic dartdoc-provided static content.
   final copiedStatic = copyDirectory(
       scriptDir.append('../../sdk/lib/_internal/dartdoc/static'),
       outputDir);

   // The apidoc-specific static content.
   final copiedApiDocStatic = copyDirectory(
       scriptDir.append('static'),
       outputDir);

   print('Parsing MDN data...');
   final mdnFile = new File.fromPath(scriptDir.append('mdn/database.json'));
   final mdn = json.parse(mdnFile.readAsStringSync());

   print('Cross-referencing dart:html...');
   // TODO(amouravski): move HtmlDiff inside of the future chain below to re-use
   // the MirrorSystem already analyzed.
   _diff = new HtmlDiff(printWarnings:false);
   Future htmlDiff = _diff.run(libPath);

   // TODO(johnniwinther): Libraries for the compilation seem to be more like
   // URIs. Perhaps Path should have a toURI() method.
   // Add all of the core libraries.
   final apidocLibraries = <Path>[];
   LIBRARIES.forEach((String name, LibraryInfo info) {
     if (info.documented) {
       apidocLibraries.add(new Path('dart:$name'));
     }
   });

   // TODO(amouravski): This code is really wonky.
   var lister = new Directory.fromPath(scriptDir.append('../../pkg')).list();
   lister.listen((entity) {
     if (entity is Directory) {
       var path = new Path(entity.path);
       var libName = path.filename;
       var libPath = path.append('lib/$libName.dart');

       // Ignore some libraries.
       if (excludedLibraries.contains(libName)) {
         return;
       }

       // Ignore hidden directories (like .svn) as well as pkg.xcodeproj.
       if (libName.startsWith('.') || libName.endsWith('.xcodeproj')) {
         return;
       }

       if (new File.fromPath(libPath).existsSync()) {
         apidocLibraries.add(libPath);
         includedLibraries.add(libName);
       } else {
         print('Warning: could not find package at $path');
       }
     }
   }, onDone: () {
     final apidoc = new Apidoc(mdn, outputDir, mode, generateAppCache,
                               excludedLibraries, version);
     apidoc.dartdocPath =
         scriptDir.append('../../sdk/lib/_internal/dartdoc/');
     // Select the libraries to include in the produced documentation:
     apidoc.includeApi = true;
     apidoc.includedLibraries = includedLibraries;

     // TODO(amouravski): make apidoc use roughly the same flow as bin/dartdoc.
     Future.wait([copiedStatic, copiedApiDocStatic, htmlDiff])
       .then((_) => apidoc.documentLibraries(apidocLibraries, libPath, pkgPath))
       .then((_) => compileScript(mode, outputDir, libPath))
       .then((_) => print(apidoc.status))
       .catchError((e) => print('Error: generation failed: ${e.error}'))
       .whenComplete(() => apidoc.cleanup());
   });
 }

 class Apidoc extends Dartdoc {
   /** Big ball of JSON containing the scraped MDN documentation. */
   final Map mdn;


   // A set of type names (TypeMirror.simpleName values) to ignore while
   // looking up information from MDN data.  TODO(eub, jacobr): fix up the MDN
   // import scripts so they run correctly and generate data that doesn't have
   // any entries that need to be ignored.
   static Set<String> _mdnTypeNamesToSkip = null;

   /**
    * The URL to the page on MDN that content was pulled from for the current
    * type being documented. Will be `null` if the type doesn't use any MDN
    * content.
    */
   String mdnUrl = null;

   Apidoc(this.mdn, Path outputDir, int mode,
          bool generateAppCache, [excludedLibraries, String version]) {
     if (?excludedLibraries) {
       this.excludedLibraries = excludedLibraries;
     }
     this.version = version;
     this.outputDir = outputDir;
     this.mode = mode;
     this.generateAppCache = generateAppCache;

     // Skip bad entries in the checked-in mdn/database.json:
     //  * UnknownElement has a top-level Gecko DOM page in German.
     if (_mdnTypeNamesToSkip == null)
       _mdnTypeNamesToSkip = new Set.from(['UnknownElement']);

     mainTitle = 'Dart API Reference';
     mainUrl = 'http://dartlang.org';

     final note    = 'http://code.google.com/policies.html#restrictions';
     final cca     = 'http://creativecommons.org/licenses/by/3.0/';
     final bsd     = 'http://code.google.com/google_bsd_license.html';
     final tos     = 'http://www.dartlang.org/tos.html';
     final privacy = 'http://www.google.com/intl/en/privacy/privacy-policy.html';

     footerText =
         '''
         <p>Except as otherwise <a href="$note">noted</a>, the content of this
         page is licensed under the <a href="$cca">Creative Commons Attribution
         3.0 License</a>, and code samples are licensed under the
         <a href="$bsd">BSD License</a>.</p>
         <p><a href="$tos">Terms of Service</a> |
         <a href="$privacy">Privacy Policy</a></p>
         ''';

     searchEngineId = '011220921317074318178:i4mscbaxtru';
     searchResultsUrl = 'http://www.dartlang.org/search.html';
   }

   void writeHeadContents(String title) {
     super.writeHeadContents(title);

     // Include the apidoc-specific CSS.
     // TODO(rnystrom): Use our CSS pre-processor to combine these.
     writeln(
         '''
         <link rel="stylesheet" type="text/css"
             href="${relativePath('apidoc-styles.css')}" />
         ''');

     // Add the analytics code.
     writeln(
         '''
         <script type="text/javascript">
           var _gaq = _gaq || [];
           _gaq.push(["_setAccount", "UA-26406144-9"]);
           _gaq.push(["_trackPageview"]);

           (function() {
             var ga = document.createElement("script");
             ga.type = "text/javascript"; ga.async = true;
             ga.src = ("https:" == document.location.protocol ?
               "https://ssl" : "http://www") + ".google-analytics.com/ga.js";
             var s = document.getElementsByTagName("script")[0];
             s.parentNode.insertBefore(ga, s);
           })();
         </script>
         ''');
   }

   void docIndexLibrary(LibraryMirror library) {
     // TODO(rnystrom): Hackish. The IO libraries reference this but we don't
     // want it in the docs.
     if (displayName(library) == 'dart:nativewrappers') return;
     super.docIndexLibrary(library);
   }

   void docLibraryNavigationJson(LibraryMirror library, List libraryList) {
     // TODO(rnystrom): Hackish. The IO libraries reference this but we don't
     // want it in the docs.
     if (displayName(library) == 'dart:nativewrappers') return;
     super.docLibraryNavigationJson(library, libraryList);
   }

   void docLibrary(LibraryMirror library) {
     // TODO(rnystrom): Hackish. The IO libraries reference this but we don't
     // want it in the docs.
     if (displayName(library) == 'dart:nativewrappers') return;
     super.docLibrary(library);
   }

   DocComment getLibraryComment(LibraryMirror library) {
     return super.getLibraryComment(library);
   }

   DocComment getTypeComment(TypeMirror type) {
     return _mergeDocs(
         includeMdnTypeComment(type), super.getTypeComment(type));
   }

   DocComment getMemberComment(MemberMirror member) {
     return _mergeDocs(
         includeMdnMemberComment(member), super.getMemberComment(member));
   }

   DocComment _mergeDocs(MdnComment mdnComment,
                             DocComment fileComment) {
     // Otherwise, prefer comment from the (possibly generated) Dart file.
     if (fileComment != null) return fileComment;

     // Finally, fallback on MDN if available.
     if (mdnComment != null) {
       mdnUrl = mdnComment.mdnUrl;
       return mdnComment;
     }

     // We got nothing!
     return null;
   }

   void docType(TypeMirror type) {
     // Track whether we've inserted MDN content into this page.
     mdnUrl = null;

     super.docType(type);
   }

   void writeTypeFooter() {
     if (mdnUrl != null) {
       final MOZ = 'http://www.mozilla.org/';
       final MDN = 'https://developer.mozilla.org';
       final CCA = 'http://creativecommons.org/licenses/by-sa/2.5/';
       final CONTRIB = 'https://developer.mozilla.org/Project:en/How_to_Help';
       writeln(
           '''
           <p class="mdn-attribution">
           <a href="$MDN">
             <img src="${relativePath('mdn-logo-tiny.png')}" class="mdn-logo" />
           </a>
           This page includes <a href="$mdnUrl">content</a> from the
           <a href="$MOZ">Mozilla Foundation</a> that is graciously
           <a href="$MDN/Project:Copyrights">licensed</a> under a
           <a href="$CCA">Creative Commons: Attribution-Sharealike license</a>.
           Mozilla has no other association with Dart or dartlang.org. We
           encourage you to improve the web by
           <a href="$CONTRIB">contributing</a> to
           <a href="$MDN">The Mozilla Developer Network</a>.
           </p>
           ''');
     }
   }

   MdnComment lookupMdnComment(Mirror mirror) {
     if (mirror is TypeMirror) {
       return includeMdnTypeComment(mirror);
     } else if (mirror is MemberMirror) {
       return includeMdnMemberComment(mirror);
     } else {
       return null;
     }
   }

   /**
    * Gets the MDN-scraped docs for [type], or `null` if this type isn't
    * scraped from MDN.
    */
   MdnComment includeMdnTypeComment(TypeMirror type) {
     if (_mdnTypeNamesToSkip.contains(type.simpleName)) {
       return null;
     }

     var typeString = '';
     if (HTML_LIBRARY_NAMES.contains(displayName(type.library))) {
       // If it's an HTML type, try to map it to a base DOM type so we can find
       // the MDN docs.
       final domTypes = _diff.htmlTypesToDom[type.qualifiedName];

       // Couldn't find a DOM type.
       if ((domTypes == null) || (domTypes.length != 1)) return null;

       // Use the corresponding DOM type when searching MDN.
       // TODO(rnystrom): Shame there isn't a simpler way to get the one item
       // out of a singleton Set.
       // TODO(floitsch): switch to domTypes.first, once that's implemented.
       var iter = domTypes.iterator;
       iter.moveNext();
       typeString = iter.current;
     } else {
       // Not a DOM type.
       return null;
     }

     final mdnType = mdn[typeString];
     if (mdnType == null) return null;
     if (mdnType['skipped'] != null) return null;
     if (mdnType['summary'] == null) return null;
     if (mdnType['summary'].trim().isEmpty) return null;

     // Remember which MDN page we're using so we can attribute it.
     return new MdnComment(mdnType['summary'], mdnType['srcUrl']);
   }

   /**
    * Gets the MDN-scraped docs for [member], or `null` if this type isn't
    * scraped from MDN.
    */
   MdnComment includeMdnMemberComment(MemberMirror member) {
     var library = findLibrary(member);
     var memberString = '';
     if (HTML_LIBRARY_NAMES.contains(displayName(library))) {
       // If it's an HTML type, try to map it to a DOM type name so we can find
       // the MDN docs.
       final domMembers = _diff.htmlToDom[member.qualifiedName];

       // Couldn't find a DOM type.
       if ((domMembers == null) || (domMembers.length != 1)) return null;

       // Use the corresponding DOM member when searching MDN.
       // TODO(rnystrom): Shame there isn't a simpler way to get the one item
       // out of a singleton Set.
       // TODO(floitsch): switch to domTypes.first, once that's implemented.
       var iter = domMembers.iterator;
       iter.moveNext();
       memberString = iter.current;
     } else {
       // Not a DOM type.
       return null;
     }

     // Ignore top-level functions.
     if (member.isTopLevel) return null;

     var mdnMember = null;
     var mdnType =  null;
     var pieces = memberString.split('.');
     if (pieces.length == 2) {
       mdnType = mdn[pieces[0]];
       if (mdnType == null) return null;
       var nameToFind = pieces[1];
       for (final candidateMember in mdnType['members']) {
         if (candidateMember['name'] == nameToFind) {
           mdnMember = candidateMember;
           break;
         }
       }
     }

     if (mdnMember == null) return null;
     if (mdnMember['help'] == null) return null;
     if (mdnMember['help'].trim().isEmpty) return null;

     // Remember which MDN page we're using so we can attribute it.
     return new MdnComment(mdnMember['help'], mdnType['srcUrl']);
   }

   /**
    * Returns a link to [member], relative to a type page that may be in a
    * different library than [member].
    */
   String _linkMember(MemberMirror member) {
     final typeName = member.owner.simpleName;
     var memberName = '$typeName.${member.simpleName}';
     if (member is MethodMirror && (member.isConstructor || member.isFactory)) {
       final separator = member.constructorName == '' ? '' : '.';
       memberName = 'new $typeName$separator${member.constructorName}';
     }

     return a(memberUrl(member), memberName);
   }
 }
	// 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.

	/**
	* This generates the reference documentation for the core libraries that come
	* with dart. It is built on top of dartdoc, which is a general-purpose library
	* for generating docs from any Dart code. This library extends that to include
	* additional information and styling specific to our standard library.
	*
	* Usage:
	*
	* $ dart apidoc.dart [--out=<output directory>]
	*/
	library apidoc;

	import 'dart:async';
	import 'dart:io';
	import 'dart:json' as json;

	import 'html_diff.dart';

	// TODO(rnystrom): Use "package:" URL (#4968).
	import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors.dart';
	import '../../sdk/lib/_internal/compiler/implementation/mirrors/mirrors_util.dart';
	import '../../sdk/lib/_internal/dartdoc/lib/dartdoc.dart';
	import '../../sdk/lib/_internal/libraries.dart';

	HtmlDiff _diff;

	void main() {
	final args = new Options().arguments;

	int mode = MODE_STATIC;
	Path outputDir = new Path('docs');
	bool generateAppCache = false;

	List<String> excludedLibraries = <String>[];
	List<String> includedLibraries = <String>[];
	Path pkgPath;
	String version;

	// Parse the command-line arguments.
	for (int i = 0; i < args.length; i++) {
	final arg = args[i];

	switch (arg) {
	case '--mode=static':
	mode = MODE_STATIC;
	break;

	case '--mode=live-nav':
	mode = MODE_LIVE_NAV;
	break;

	case '--generate-app-cache=true':
	generateAppCache = true;
	break;

	default:
	if (arg.startsWith('--exclude-lib=')) {
	excludedLibraries.add(arg.substring('--exclude-lib='.length));
	} else if (arg.startsWith('--include-lib=')) {
	includedLibraries.add(arg.substring('--include-lib='.length));
	} else if (arg.startsWith('--out=')) {
	outputDir = new Path(arg.substring('--out='.length));
	} else if (arg.startsWith('--pkg=')) {
	pkgPath = new Path(arg.substring('--pkg='.length));
	} else if (arg.startsWith('--version=')) {
	version = arg.substring('--version='.length);
	} else {
	print('Unknown option: $arg');
	return;
	}
	break;
	}
	}

	final libPath = scriptDir.append('../../sdk/');

	cleanOutputDirectory(outputDir);

	print('Copying static files...');
	// The basic dartdoc-provided static content.
	final copiedStatic = copyDirectory(
	scriptDir.append('../../sdk/lib/_internal/dartdoc/static'),
	outputDir);

	// The apidoc-specific static content.
	final copiedApiDocStatic = copyDirectory(
	scriptDir.append('static'),
	outputDir);

	print('Parsing MDN data...');
	final mdnFile = new File.fromPath(scriptDir.append('mdn/database.json'));
	final mdn = json.parse(mdnFile.readAsStringSync());

	print('Cross-referencing dart:html...');
	// TODO(amouravski): move HtmlDiff inside of the future chain below to re-use
	// the MirrorSystem already analyzed.
	_diff = new HtmlDiff(printWarnings:false);
	Future htmlDiff = _diff.run(libPath);

	// TODO(johnniwinther): Libraries for the compilation seem to be more like
	// URIs. Perhaps Path should have a toURI() method.
	// Add all of the core libraries.
	final apidocLibraries = <Path>[];
	LIBRARIES.forEach((String name, LibraryInfo info) {
	if (info.documented) {
	apidocLibraries.add(new Path('dart:$name'));
	}
	});

	// TODO(amouravski): This code is really wonky.
	var lister = new Directory.fromPath(scriptDir.append('../../pkg')).list();
	lister.listen((entity) {
	if (entity is Directory) {
	var path = new Path(entity.path);
	var libName = path.filename;
	var libPath = path.append('lib/$libName.dart');

	// Ignore some libraries.
	if (excludedLibraries.contains(libName)) {
	return;
	}

	// Ignore hidden directories (like .svn) as well as pkg.xcodeproj.
	if (libName.startsWith('.') \|\| libName.endsWith('.xcodeproj')) {
	return;
	}

	if (new File.fromPath(libPath).existsSync()) {
	apidocLibraries.add(libPath);
	includedLibraries.add(libName);
	} else {
	print('Warning: could not find package at $path');
	}
	}
	}, onDone: () {
	final apidoc = new Apidoc(mdn, outputDir, mode, generateAppCache,
	excludedLibraries, version);
	apidoc.dartdocPath =
	scriptDir.append('../../sdk/lib/_internal/dartdoc/');
	// Select the libraries to include in the produced documentation:
	apidoc.includeApi = true;
	apidoc.includedLibraries = includedLibraries;

	// TODO(amouravski): make apidoc use roughly the same flow as bin/dartdoc.
	Future.wait([copiedStatic, copiedApiDocStatic, htmlDiff])
	.then((_) => apidoc.documentLibraries(apidocLibraries, libPath, pkgPath))
	.then((_) => compileScript(mode, outputDir, libPath))
	.then((_) => print(apidoc.status))
	.catchError((e) => print('Error: generation failed: ${e.error}'))
	.whenComplete(() => apidoc.cleanup());
	});
	}

	class Apidoc extends Dartdoc {
	/** Big ball of JSON containing the scraped MDN documentation. */
	final Map mdn;


	// A set of type names (TypeMirror.simpleName values) to ignore while
	// looking up information from MDN data. TODO(eub, jacobr): fix up the MDN
	// import scripts so they run correctly and generate data that doesn't have
	// any entries that need to be ignored.
	static Set<String> _mdnTypeNamesToSkip = null;

	/**
	* The URL to the page on MDN that content was pulled from for the current
	* type being documented. Will be `null` if the type doesn't use any MDN
	* content.
	*/
	String mdnUrl = null;

	Apidoc(this.mdn, Path outputDir, int mode,
	bool generateAppCache, [excludedLibraries, String version]) {
	if (?excludedLibraries) {
	this.excludedLibraries = excludedLibraries;
	}
	this.version = version;
	this.outputDir = outputDir;
	this.mode = mode;
	this.generateAppCache = generateAppCache;

	// Skip bad entries in the checked-in mdn/database.json:
	// * UnknownElement has a top-level Gecko DOM page in German.
	if (_mdnTypeNamesToSkip == null)
	_mdnTypeNamesToSkip = new Set.from(['UnknownElement']);

	mainTitle = 'Dart API Reference';
	mainUrl = 'http://dartlang.org';

	final note = 'http://code.google.com/policies.html#restrictions';
	final cca = 'http://creativecommons.org/licenses/by/3.0/';
	final bsd = 'http://code.google.com/google_bsd_license.html';
	final tos = 'http://www.dartlang.org/tos.html';
	final privacy = 'http://www.google.com/intl/en/privacy/privacy-policy.html';

	footerText =
	'''
	<p>Except as otherwise <a href="$note">noted</a>, the content of this
	page is licensed under the <a href="$cca">Creative Commons Attribution
	3.0 License</a>, and code samples are licensed under the
	<a href="$bsd">BSD License</a>.</p>
	<p><a href="$tos">Terms of Service</a> \|
	<a href="$privacy">Privacy Policy</a></p>
	''';

	searchEngineId = '011220921317074318178:i4mscbaxtru';
	searchResultsUrl = 'http://www.dartlang.org/search.html';
	}

	void writeHeadContents(String title) {
	super.writeHeadContents(title);

	// Include the apidoc-specific CSS.
	// TODO(rnystrom): Use our CSS pre-processor to combine these.
	writeln(
	'''
	<link rel="stylesheet" type="text/css"
	href="${relativePath('apidoc-styles.css')}" />
	''');

	// Add the analytics code.
	writeln(
	'''
	<script type="text/javascript">
	var _gaq = _gaq \|\| [];
	_gaq.push(["_setAccount", "UA-26406144-9"]);
	_gaq.push(["_trackPageview"]);

	(function() {
	var ga = document.createElement("script");
	ga.type = "text/javascript"; ga.async = true;
	ga.src = ("https:" == document.location.protocol ?
	"https://ssl" : "http://www") + ".google-analytics.com/ga.js";
	var s = document.getElementsByTagName("script")[0];
	s.parentNode.insertBefore(ga, s);
	})();
	</script>
	''');
	}

	void docIndexLibrary(LibraryMirror library) {
	// TODO(rnystrom): Hackish. The IO libraries reference this but we don't
	// want it in the docs.
	if (displayName(library) == 'dart:nativewrappers') return;
	super.docIndexLibrary(library);
	}

	void docLibraryNavigationJson(LibraryMirror library, List libraryList) {
	// TODO(rnystrom): Hackish. The IO libraries reference this but we don't
	// want it in the docs.
	if (displayName(library) == 'dart:nativewrappers') return;
	super.docLibraryNavigationJson(library, libraryList);
	}

	void docLibrary(LibraryMirror library) {
	// TODO(rnystrom): Hackish. The IO libraries reference this but we don't
	// want it in the docs.
	if (displayName(library) == 'dart:nativewrappers') return;
	super.docLibrary(library);
	}

	DocComment getLibraryComment(LibraryMirror library) {
	return super.getLibraryComment(library);
	}

	DocComment getTypeComment(TypeMirror type) {
	return _mergeDocs(
	includeMdnTypeComment(type), super.getTypeComment(type));
	}

	DocComment getMemberComment(MemberMirror member) {
	return _mergeDocs(
	includeMdnMemberComment(member), super.getMemberComment(member));
	}

	DocComment _mergeDocs(MdnComment mdnComment,
	DocComment fileComment) {
	// Otherwise, prefer comment from the (possibly generated) Dart file.
	if (fileComment != null) return fileComment;

	// Finally, fallback on MDN if available.
	if (mdnComment != null) {
	mdnUrl = mdnComment.mdnUrl;
	return mdnComment;
	}

	// We got nothing!
	return null;
	}

	void docType(TypeMirror type) {
	// Track whether we've inserted MDN content into this page.
	mdnUrl = null;

	super.docType(type);
	}

	void writeTypeFooter() {
	if (mdnUrl != null) {
	final MOZ = 'http://www.mozilla.org/';
	final MDN = 'https://developer.mozilla.org';
	final CCA = 'http://creativecommons.org/licenses/by-sa/2.5/';
	final CONTRIB = 'https://developer.mozilla.org/Project:en/How_to_Help';
	writeln(
	'''
	<p class="mdn-attribution">
	<a href="$MDN">
	<img src="${relativePath('mdn-logo-tiny.png')}" class="mdn-logo" />
	</a>
	This page includes <a href="$mdnUrl">content</a> from the
	<a href="$MOZ">Mozilla Foundation</a> that is graciously
	<a href="$MDN/Project:Copyrights">licensed</a> under a
	<a href="$CCA">Creative Commons: Attribution-Sharealike license</a>.
	Mozilla has no other association with Dart or dartlang.org. We
	encourage you to improve the web by
	<a href="$CONTRIB">contributing</a> to
	<a href="$MDN">The Mozilla Developer Network</a>.
	</p>
	''');
	}
	}

	MdnComment lookupMdnComment(Mirror mirror) {
	if (mirror is TypeMirror) {
	return includeMdnTypeComment(mirror);
	} else if (mirror is MemberMirror) {
	return includeMdnMemberComment(mirror);
	} else {
	return null;
	}
	}

	/**
	* Gets the MDN-scraped docs for [type], or `null` if this type isn't
	* scraped from MDN.
	*/
	MdnComment includeMdnTypeComment(TypeMirror type) {
	if (_mdnTypeNamesToSkip.contains(type.simpleName)) {
	return null;
	}

	var typeString = '';
	if (HTML_LIBRARY_NAMES.contains(displayName(type.library))) {
	// If it's an HTML type, try to map it to a base DOM type so we can find
	// the MDN docs.
	final domTypes = _diff.htmlTypesToDom[type.qualifiedName];

	// Couldn't find a DOM type.
	if ((domTypes == null) \|\| (domTypes.length != 1)) return null;

	// Use the corresponding DOM type when searching MDN.
	// TODO(rnystrom): Shame there isn't a simpler way to get the one item
	// out of a singleton Set.
	// TODO(floitsch): switch to domTypes.first, once that's implemented.
	var iter = domTypes.iterator;
	iter.moveNext();
	typeString = iter.current;
	} else {
	// Not a DOM type.
	return null;
	}

	final mdnType = mdn[typeString];
	if (mdnType == null) return null;
	if (mdnType['skipped'] != null) return null;
	if (mdnType['summary'] == null) return null;
	if (mdnType['summary'].trim().isEmpty) return null;

	// Remember which MDN page we're using so we can attribute it.
	return new MdnComment(mdnType['summary'], mdnType['srcUrl']);
	}

	/**
	* Gets the MDN-scraped docs for [member], or `null` if this type isn't
	* scraped from MDN.
	*/
	MdnComment includeMdnMemberComment(MemberMirror member) {
	var library = findLibrary(member);
	var memberString = '';
	if (HTML_LIBRARY_NAMES.contains(displayName(library))) {
	// If it's an HTML type, try to map it to a DOM type name so we can find
	// the MDN docs.
	final domMembers = _diff.htmlToDom[member.qualifiedName];

	// Couldn't find a DOM type.
	if ((domMembers == null) \|\| (domMembers.length != 1)) return null;

	// Use the corresponding DOM member when searching MDN.
	// TODO(rnystrom): Shame there isn't a simpler way to get the one item
	// out of a singleton Set.
	// TODO(floitsch): switch to domTypes.first, once that's implemented.
	var iter = domMembers.iterator;
	iter.moveNext();
	memberString = iter.current;
	} else {
	// Not a DOM type.
	return null;
	}

	// Ignore top-level functions.
	if (member.isTopLevel) return null;

	var mdnMember = null;
	var mdnType = null;
	var pieces = memberString.split('.');
	if (pieces.length == 2) {
	mdnType = mdn[pieces[0]];
	if (mdnType == null) return null;
	var nameToFind = pieces[1];
	for (final candidateMember in mdnType['members']) {
	if (candidateMember['name'] == nameToFind) {
	mdnMember = candidateMember;
	break;
	}
	}
	}

	if (mdnMember == null) return null;
	if (mdnMember['help'] == null) return null;
	if (mdnMember['help'].trim().isEmpty) return null;

	// Remember which MDN page we're using so we can attribute it.
	return new MdnComment(mdnMember['help'], mdnType['srcUrl']);
	}

	/**
	* Returns a link to [member], relative to a type page that may be in a
	* different library than [member].
	*/
	String _linkMember(MemberMirror member) {
	final typeName = member.owner.simpleName;
	var memberName = '$typeName.${member.simpleName}';
	if (member is MethodMirror && (member.isConstructor \|\| member.isFactory)) {
	final separator = member.constructorName == '' ? '' : '.';
	memberName = 'new $typeName$separator${member.constructorName}';
	}

	return a(memberUrl(member), memberName);
	}
	}