packages/polymer/lib/src/build/index_page_builder.dart - observatory_pub_packages - Git at Google

 // 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.

 /// Builds an index.html file in each folder containing entry points, if none
 /// already exists. This file simply lists all the entry point files.
 library polymer.src.build.index_page_builder;

 import 'dart:async';
 import 'dart:math';

 import 'package:barback/barback.dart';
 import 'package:path/path.dart' as path;

 import 'common.dart';

 /// Builds an index.html file in each folder containing entry points, if none
 /// already exists. This file simply lists all the entry point files.
 class IndexPageBuilder extends AggregateTransformer {
   final TransformOptions options;

   IndexPageBuilder(this.options);

   classifyPrimary(AssetId id) {
     if (!options.isHtmlEntryPoint(id)) return null;
     // Group all entry points together.
     return 'all_entry_points';
   }

   Future apply(AggregateTransform transform) {
     Map<String, List<String>> dirFilesMap = {};

     return transform.primaryInputs.toList().then((assets) {
       // Add the asset to its directory, and make sure its directory is included
       // in all its parents.
       for (var asset in assets) {
         var dir = path.url.dirname(asset.id.path);
         while (dir != '.') {
           dirFilesMap.putIfAbsent(dir, () => []);

           var relativePath = path.url.relative(asset.id.path, from: dir);
           var relativeDir = path.url.dirname(relativePath);
           dirFilesMap[dir].add(relativePath);
           dir = path.url.dirname(dir);
         }
       }

       // Create an output index.html file for each directory, if one doesn't
       // exist already
       var futures = [];
       dirFilesMap.forEach((directory, files) {
         futures.add(_createOutput(directory, files, transform));
       });
       return Future.wait(futures);
     });
   }

   Future _createOutput(
       String directory, List<String> files, AggregateTransform transform) {
     var indexAsset =
         new AssetId(transform.package, path.url.join(directory, 'index.html'));

     return transform.hasInput(indexAsset).then((exists) {
       // Don't overwrite existing outputs!
       if (exists) return;

       // Sort alphabetically by recursive path parts.
       files.sort((String a, String b) {
         var aParts = path.url.split(a);
         var bParts = path.url.split(b);
         int diff = 0;
         int minLength = min(aParts.length, bParts.length);
         for (int i = 0; i < minLength; i++) {
           // Directories are sorted below files.
           var aIsDir = i < aParts.length - 1;
           var bIsDir = i < bParts.length - 1;
           if (aIsDir && !bIsDir) return 1;
           if (!aIsDir && bIsDir) return -1;

           // Raw string comparison, if not identical we return.
           diff = aParts[i].compareTo(bParts[i]);
           if (diff != 0) return diff;
         }
         // Identical files, shouldn't happen in practice.
         return 0;
       });

       // Create the document with a list.
       var doc = new StringBuffer(
           '<!DOCTYPE html><html><body><h1>Entry points</h1><ul>');

       // Add all the assets to the list.
       for (var file in files) {
         doc.write('<li><a href="$file">$file</a></li>');
       }

       doc.write('</ul></body></html>');

       // Output the index.html file
       transform.addOutput(new Asset.fromString(indexAsset, doc.toString()));
     });
   }
 }
	// 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.

	/// Builds an index.html file in each folder containing entry points, if none
	/// already exists. This file simply lists all the entry point files.
	library polymer.src.build.index_page_builder;

	import 'dart:async';
	import 'dart:math';

	import 'package:barback/barback.dart';
	import 'package:path/path.dart' as path;

	import 'common.dart';

	/// Builds an index.html file in each folder containing entry points, if none
	/// already exists. This file simply lists all the entry point files.
	class IndexPageBuilder extends AggregateTransformer {
	final TransformOptions options;

	IndexPageBuilder(this.options);

	classifyPrimary(AssetId id) {
	if (!options.isHtmlEntryPoint(id)) return null;
	// Group all entry points together.
	return 'all_entry_points';
	}

	Future apply(AggregateTransform transform) {
	Map<String, List<String>> dirFilesMap = {};

	return transform.primaryInputs.toList().then((assets) {
	// Add the asset to its directory, and make sure its directory is included
	// in all its parents.
	for (var asset in assets) {
	var dir = path.url.dirname(asset.id.path);
	while (dir != '.') {
	dirFilesMap.putIfAbsent(dir, () => []);

	var relativePath = path.url.relative(asset.id.path, from: dir);
	var relativeDir = path.url.dirname(relativePath);
	dirFilesMap[dir].add(relativePath);
	dir = path.url.dirname(dir);
	}
	}

	// Create an output index.html file for each directory, if one doesn't
	// exist already
	var futures = [];
	dirFilesMap.forEach((directory, files) {
	futures.add(_createOutput(directory, files, transform));
	});
	return Future.wait(futures);
	});
	}

	Future _createOutput(
	String directory, List<String> files, AggregateTransform transform) {
	var indexAsset =
	new AssetId(transform.package, path.url.join(directory, 'index.html'));

	return transform.hasInput(indexAsset).then((exists) {
	// Don't overwrite existing outputs!
	if (exists) return;

	// Sort alphabetically by recursive path parts.
	files.sort((String a, String b) {
	var aParts = path.url.split(a);
	var bParts = path.url.split(b);
	int diff = 0;
	int minLength = min(aParts.length, bParts.length);
	for (int i = 0; i < minLength; i++) {
	// Directories are sorted below files.
	var aIsDir = i < aParts.length - 1;
	var bIsDir = i < bParts.length - 1;
	if (aIsDir && !bIsDir) return 1;
	if (!aIsDir && bIsDir) return -1;

	// Raw string comparison, if not identical we return.
	diff = aParts[i].compareTo(bParts[i]);
	if (diff != 0) return diff;
	}
	// Identical files, shouldn't happen in practice.
	return 0;
	});

	// Create the document with a list.
	var doc = new StringBuffer(
	'<!DOCTYPE html><html><body><h1>Entry points</h1><ul>');

	// Add all the assets to the list.
	for (var file in files) {
	doc.write('<li><a href="$file">$file</a></li>');
	}

	doc.write('</ul></body></html>');

	// Output the index.html file
	transform.addOutput(new Asset.fromString(indexAsset, doc.toString()));
	});
	}
	}