Drop support for Dart 1

.travis.yml

@@ -5,13 +5,11 @@ language: ruby
 
 env:
 # Language specs, defined in sass/sass-spec
-- TASK=specs   DART_CHANNEL=dev    DART_VERSION=latest
-- TASK=specs   DART_CHANNEL=stable DART_VERSION=latest
-- TASK=specs   DART_CHANNEL=stable DART_VERSION=latest ASYNC=true
+- TASK=specs   DART_CHANNEL=dev DART_VERSION=latest
+- TASK=specs   DART_CHANNEL=dev DART_VERSION=latest ASYNC=true
 
 # Unit tests, defined in test/.
 - TASK=tests   DART_CHANNEL=dev    DART_VERSION=latest
-- TASK=tests   DART_CHANNEL=stable DART_VERSION=latest
 
 # This should be NODE_VERSION=latest, but that's breaking due to
 # laverdet/node-fibers#378.
@@ -23,8 +21,8 @@ env:
 - TASK=tests   DART_CHANNEL=dev    DART_VERSION=latest NODE_VERSION=lts/carbon
 
 # Miscellaneous checks.
-- TASK=analyze DART_CHANNEL=dev    DART_VERSION=latest
-- TASK=format  DART_CHANNEL=dev    DART_VERSION=latest
+- TASK=analyze DART_CHANNEL=dev DART_VERSION=latest
+- TASK=format  DART_CHANNEL=dev DART_VERSION=latest
 
 rvm:
 - 2.3.1

lib/src/ast/sass/argument_declaration.dart

@@ -98,7 +98,7 @@ class ArgumentDeclaration implements SassNode {
   }
 
   String toString() {
-    var components = new List.from(arguments.map((arg) => arg.toString()));
+    var components = new List.of(arguments.map((arg) => arg.toString()));
     if (restArgument != null) components.add('$restArgument...');
     return components.join(', ');
   }

lib/src/async_import_cache.dart

@@ -4,14 +4,14 @@
 
 import 'dart:async';
 
+import 'package:path/path.dart' as p;
 import 'package:tuple/tuple.dart';
 
 import 'ast/sass.dart';
 import 'importer.dart';
 import 'logger.dart';
 import 'sync_package_resolver.dart';
 import 'utils.dart'; // ignore: unused_import
-import 'util/path.dart';
 
 /// An in-memory cache of parsed stylesheets that have been imported by Sass.
 class AsyncImportCache {
@@ -142,7 +142,7 @@ class AsyncImportCache {
       // stack traces.
       var displayUrl = originalUrl == null
           ? canonicalUrl
-          : originalUrl.resolve(pUrl.basename(canonicalUrl.path));
+          : originalUrl.resolve(p.url.basename(canonicalUrl.path));
       return result.isIndented
           ? new Stylesheet.parseSass(result.contents,
               url: displayUrl, logger: _logger)

lib/src/callable/async.dart

@@ -4,8 +4,6 @@
 
 import 'dart:async';
 
-import 'package:async/async.dart';
-
 import '../value.dart';
 import '../value/external/value.dart' as ext;
 import 'async_built_in.dart';
@@ -34,6 +32,6 @@ abstract class AsyncCallable {
       new AsyncBuiltInCallable(name, arguments, (arguments) {
         var result = callback(arguments);
         if (result is ext.Value) return result as Value;
-        return DelegatingFuture.typed(result as Future);
+        return (result as Future).then((value) => value as Value);
       });
 }

lib/src/compile.dart

@@ -4,6 +4,7 @@
 
 import 'dart:async';
 
+import 'package:path/path.dart' as p;
 import 'package:source_maps/source_maps.dart';
 import 'package:source_span/source_span.dart';
 
@@ -16,7 +17,6 @@ import 'importer/node.dart';
 import 'io.dart';
 import 'logger.dart';
 import 'sync_package_resolver.dart';
-import 'util/path.dart';
 import 'visitor/async_evaluate.dart';
 import 'visitor/evaluate.dart';
 import 'visitor/serialize.dart';

lib/src/executable.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 import 'dart:isolate';
 
+import 'package:path/path.dart' as p;
 import 'package:stack_trace/stack_trace.dart';
 
 import 'exception.dart';
@@ -15,7 +16,6 @@ import 'executable/watch.dart';
 import 'import_cache.dart';
 import 'io.dart';
 import 'stylesheet_graph.dart';
-import 'util/path.dart';
 
 main(List<String> args) async {
   var printedError = false;

lib/src/executable/compile_stylesheet.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 
 import 'package:dart2_constant/convert.dart' as convert;
+import 'package:path/path.dart' as p;
 import 'package:source_maps/source_maps.dart';
 
 import '../../sass.dart';
@@ -13,7 +14,6 @@ import '../async_import_cache.dart';
 import '../import_cache.dart';
 import '../io.dart';
 import '../stylesheet_graph.dart';
-import '../util/path.dart';
 import '../visitor/async_evaluate.dart';
 import '../visitor/evaluate.dart';
 import '../visitor/serialize.dart';

lib/src/executable/options.dart

@@ -8,11 +8,11 @@ import 'package:args/args.dart';
 import 'package:charcode/charcode.dart';
 import 'package:collection/collection.dart';
 import 'package:meta/meta.dart';
+import 'package:path/path.dart' as p;
 
 import '../../sass.dart';
 import '../io.dart';
 import '../util/character.dart';
-import '../util/path.dart';
 
 /// The parsed and processed command-line options for the Sass executable.
 ///
@@ -248,7 +248,7 @@ class ExecutableOptions {
           }
         }
         _sourcesToDestinations =
-            new UnmodifiableMapView(new PathMap.of({source: destination}));
+            new UnmodifiableMapView(new p.PathMap.of({source: destination}));
       }
       _sourceDirectoriesToDestinations = const {};
       return;
@@ -260,8 +260,8 @@ class ExecutableOptions {
     // to report errors for sources as users entered them, rather than after
     // directories have been resolved.
     var seen = new Set<String>();
-    var sourcesToDestinations = new PathMap<String>();
-    var sourceDirectoriesToDestinations = new PathMap<String>();
+    var sourcesToDestinations = new p.PathMap<String>();
+    var sourceDirectoriesToDestinations = new p.PathMap<String>();
     for (var argument in _options.rest) {
       String source;
       String destination;

lib/src/executable/watch.dart

@@ -5,6 +5,7 @@
 import 'dart:async';
 import 'dart:collection';
 
+import 'package:path/path.dart' as p;
 import 'package:stack_trace/stack_trace.dart';
 import 'package:stream_transform/stream_transform.dart';
 import 'package:watcher/watcher.dart';
@@ -14,7 +15,6 @@ import '../importer/filesystem.dart';
 import '../io.dart';
 import '../stylesheet_graph.dart';
 import '../util/multi_dir_watcher.dart';
-import '../util/path.dart';
 import 'compile_stylesheet.dart';
 import 'options.dart';
 
@@ -157,7 +157,7 @@ class _Watcher {
     return events
         .transform(debounceBuffer(new Duration(milliseconds: 25)))
         .expand((buffer) {
-      var typeForPath = new PathMap<ChangeType>();
+      var typeForPath = new p.PathMap<ChangeType>();
       for (var event in buffer) {
         var oldType = typeForPath[event.path];
         if (oldType == null) {
@@ -178,7 +178,7 @@ class _Watcher {
   /// necessary.
   Future _recompileDownstream(Iterable<StylesheetNode> nodes) async {
     var seen = new Set<StylesheetNode>();
-    var toRecompile = new Queue<StylesheetNode>.from(nodes);
+    var toRecompile = new Queue.of(nodes);
 
     while (!toRecompile.isEmpty) {
       var node = toRecompile.removeFirst();
@@ -229,7 +229,7 @@ class _Watcher {
     for (var node in _graph.nodes.values) {
       var importChanged = false;
       for (var url in node.upstream.keys) {
-        if (_name(pUrl.basename(url.path)) != name) continue;
+        if (_name(p.url.basename(url.path)) != name) continue;
         _graph.clearCanonicalize(url);
 
         // If the import produces a different canonicalized URL than it did

lib/src/extend/functions.dart

@@ -22,7 +22,7 @@ import '../utils.dart';
 ///
 /// For example, `.foo` is a superselector of `:matches(.foo)`.
 final _subselectorPseudos =
-    new Set<String>.from(['matches', 'any', 'nth-child', 'nth-last-child']);
+    new Set.of(['matches', 'any', 'nth-child', 'nth-last-child']);
 
 /// Returns the contents of a [SelectorList] that matches only elements that are
 /// matched by both [complex1] and [complex2].
@@ -183,8 +183,8 @@ List<List<ComplexSelectorComponent>> weave(
 Iterable<List<ComplexSelectorComponent>> _weaveParents(
     List<ComplexSelectorComponent> parents1,
     List<ComplexSelectorComponent> parents2) {
-  var queue1 = new Queue<ComplexSelectorComponent>.from(parents1);
-  var queue2 = new Queue<ComplexSelectorComponent>.from(parents2);
+  var queue1 = new Queue.of(parents1);
+  var queue2 = new Queue.of(parents2);
 
   var initialCombinators = _mergeInitialCombinators(queue1, queue2);
   if (initialCombinators == null) return null;
@@ -316,9 +316,9 @@ List<List<List<ComplexSelectorComponent>>> _mergeFinalCombinators(
     // is a supersequence of the other, use that, otherwise give up.
     var lcs = longestCommonSubsequence(combinators1, combinators2);
     if (listEquals(lcs, combinators1)) {
-      result.addFirst([new List.from(combinators2.reversed)]);
+      result.addFirst([new List.of(combinators2.reversed)]);
     } else if (listEquals(lcs, combinators2)) {
-      result.addFirst([new List.from(combinators1.reversed)]);
+      result.addFirst([new List.of(combinators1.reversed)]);
     } else {
       return null;
     }
@@ -789,8 +789,12 @@ bool _selectorPseudoIsSuperselector(
 /// and that have the given [name].
 Iterable<PseudoSelector> _selectorPseudosNamed(
         CompoundSelector compound, String name) =>
-    DelegatingIterable.typed(compound.components.where((simple) =>
-        simple is PseudoSelector &&
-        simple.isClass &&
-        simple.selector != null &&
-        simple.name == name));
+    // TODO(nweiz): Use whereType() when we only have to support Dart 2 runtime
+    // semantics.
+    compound.components
+        .where((pseudo) =>
+            pseudo is PseudoSelector &&
+            pseudo.isClass &&
+            pseudo.selector != null &&
+            pseudo.name == name)
+        .cast();

lib/src/functions.dart

@@ -21,7 +21,7 @@ import 'value.dart';
 final _microsoftFilterStart = new RegExp(r'^[a-zA-Z]+\s*=');
 
 /// Feature names supported by Dart sass.
-final _features = new Set<String>.from([
+final _features = new Set.of([
   "global-variable-shadowing",
   "extend-selector-pseudoclass",
   "units-level-3",
@@ -806,13 +806,13 @@ final List<BuiltInCallable> coreFunctions = new UnmodifiableListView([
   new BuiltInCallable("map-merge", r"$map1, $map2", (arguments) {
     var map1 = arguments[0].assertMap("map1");
     var map2 = arguments[1].assertMap("map2");
-    return new SassMap(new Map.from(map1.contents)..addAll(map2.contents));
+    return new SassMap(new Map.of(map1.contents)..addAll(map2.contents));
   }),
 
   new BuiltInCallable("map-remove", r"$map, $keys...", (arguments) {
     var map = arguments[0].assertMap("map");
     var keys = arguments[1];
-    var mutableMap = new Map<Value, Value>.from(map.contents);
+    var mutableMap = new Map.of(map.contents);
     for (var key in keys.asList) {
       mutableMap.remove(key);
     }

lib/src/import_cache.dart

@@ -5,16 +5,16 @@
 // DO NOT EDIT. This file was generated from async_import_cache.dart.
 // See tool/synchronize.dart for details.
 //
-// Checksum: 411ad1e666d5a138e69b51d9bdb58e9b22e88632
+// Checksum: 393366deba2879fc8ca5f538263627e0b77c0bf2
 
+import 'package:path/path.dart' as p;
 import 'package:tuple/tuple.dart';
 
 import 'ast/sass.dart';
 import 'importer.dart';
 import 'logger.dart';
 import 'sync_package_resolver.dart';
 import 'utils.dart'; // ignore: unused_import
-import 'util/path.dart';
 
 /// An in-memory cache of parsed stylesheets that have been imported by Sass.
 class ImportCache {
@@ -145,7 +145,7 @@ class ImportCache {
       // stack traces.
       var displayUrl = originalUrl == null
           ? canonicalUrl
-          : originalUrl.resolve(pUrl.basename(canonicalUrl.path));
+          : originalUrl.resolve(p.url.basename(canonicalUrl.path));
       return result.isIndented
           ? new Stylesheet.parseSass(result.contents,
               url: displayUrl, logger: _logger)

lib/src/importer/filesystem.dart

@@ -2,9 +2,10 @@
 // MIT-style license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
+import 'package:path/path.dart' as p;
+
 import '../importer.dart';
 import '../io.dart' as io;
-import '../util/path.dart';
 import 'result.dart';
 import 'utils.dart';
 

lib/src/importer/node/implementation.dart

@@ -5,12 +5,12 @@
 import 'dart:async';
 
 import 'package:js/js.dart';
+import 'package:path/path.dart' as p;
 import 'package:tuple/tuple.dart';
 
 import '../../io.dart';
 import '../../node/importer_result.dart';
 import '../../node/utils.dart';
-import '../../util/path.dart';
 import '../utils.dart';
 
 typedef _Importer(String url, String prev, [void done(result)]);

lib/src/importer/utils.dart

@@ -2,8 +2,9 @@
 // MIT-style license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
+import 'package:path/path.dart' as p;
+
 import '../io.dart';
-import '../util/path.dart';
 
 /// Resolves an imported path using the same logic as the filesystem importer.
 ///

lib/src/io/node.dart

@@ -7,12 +7,12 @@ import 'dart:convert';
 
 import 'package:dart2_constant/convert.dart' as convert;
 import 'package:js/js.dart';
+import 'package:path/path.dart' as p;
 import 'package:source_span/source_span.dart';
 import 'package:watcher/watcher.dart';
 
 import '../exception.dart';
 import '../node/chokidar.dart';
-import '../util/path.dart';
 
 @JS()
 class _FS {

lib/src/logger/stderr.dart

@@ -2,12 +2,12 @@
 // MIT-style license that can be found in the LICENSE file or at
 // https://opensource.org/licenses/MIT.
 
+import 'package:path/path.dart' as p;
 import 'package:source_span/source_span.dart';
 import 'package:stack_trace/stack_trace.dart';
 
 import '../io.dart';
 import '../logger.dart';
-import '../util/path.dart';
 import '../utils.dart';
 
 /// A logger that prints warnings to standard error.