Replace whitelist/blacklist with safelist/blocklist (#917)

Inspired by https://twitter.com/amlyhamm/status/1202684742069604353.

lib/src/configuration.dart

@@ -63,9 +63,9 @@ class Configuration {
       newValues = UnprefixedMapView(newValues, forward.prefix);
     }
     if (forward.shownVariables != null) {
-      newValues = LimitedMapView.whitelist(newValues, forward.shownVariables);
+      newValues = LimitedMapView.safelist(newValues, forward.shownVariables);
     } else if (forward.hiddenVariables?.isNotEmpty ?? false) {
-      newValues = LimitedMapView.blacklist(newValues, forward.hiddenVariables);
+      newValues = LimitedMapView.blocklist(newValues, forward.hiddenVariables);
     }
     return Configuration(newValues, isImplicit: isImplicit);
   }

lib/src/module/forwarded_view.dart

@@ -46,27 +46,27 @@ class ForwardedModuleView<T extends AsyncCallable> implements Module<T> {
         mixins = _forwardedMap(_inner.mixins, _rule.prefix,
             _rule.shownMixinsAndFunctions, _rule.hiddenMixinsAndFunctions);
 
-  /// Wraps [map] so that it only shows members allowed by [blacklist] or
-  /// [whitelist], with the given [prefix], if given.
+  /// Wraps [map] so that it only shows members allowed by [blocklist] or
+  /// [safelist], with the given [prefix], if given.
   ///
-  /// Only one of [blacklist] or [whitelist] may be non-`null`.
+  /// Only one of [blocklist] or [safelist] may be non-`null`.
   static Map<String, V> _forwardedMap<V>(Map<String, V> map, String prefix,
-      Set<String> whitelist, Set<String> blacklist) {
-    assert(whitelist == null || blacklist == null);
+      Set<String> safelist, Set<String> blocklist) {
+    assert(safelist == null || blocklist == null);
     if (prefix == null &&
-        whitelist == null &&
-        (blacklist == null || blacklist.isEmpty)) {
+        safelist == null &&
+        (blocklist == null || blocklist.isEmpty)) {
       return map;
     }
 
     if (prefix != null) {
       map = PrefixedMapView(map, prefix);
     }
 
-    if (whitelist != null) {
-      map = LimitedMapView.whitelist(map, whitelist);
-    } else if (blacklist != null && blacklist.isNotEmpty) {
-      map = LimitedMapView.blacklist(map, blacklist);
+    if (safelist != null) {
+      map = LimitedMapView.safelist(map, safelist);
+    } else if (blocklist != null && blocklist.isNotEmpty) {
+      map = LimitedMapView.blocklist(map, blocklist);
     }
 
     return map;

lib/src/module/shadowed_view.dart

@@ -12,7 +12,7 @@ import '../util/limited_map_view.dart';
 import '../value.dart';
 
 /// A [Module] that only exposes members that aren't shadowed by a given
-/// blacklist of member names.
+/// blocklist of member names.
 class ShadowedModuleView<T extends AsyncCallable> implements Module<T> {
   /// The wrapped module.
   final Module<T> _inner;
@@ -55,16 +55,16 @@ class ShadowedModuleView<T extends AsyncCallable> implements Module<T> {
   ShadowedModuleView._(this._inner, this.variables, this.variableNodes,
       this.functions, this.mixins);
 
-  /// Returns a view of [map] with all keys in [blacklist] omitted.
+  /// Returns a view of [map] with all keys in [blocklist] omitted.
   static Map<String, V> _shadowedMap<V>(
-      Map<String, V> map, Set<String> blacklist) {
-    if (map == null || !_needsBlacklist(map, blacklist)) return map;
-    return LimitedMapView.blacklist(map, blacklist);
+      Map<String, V> map, Set<String> blocklist) {
+    if (map == null || !_needsBlacklist(map, blocklist)) return map;
+    return LimitedMapView.blocklist(map, blocklist);
   }
 
-  /// Returns whether any of [map]'s keys are in [blacklist].
-  static bool _needsBlacklist(Map<String, Object> map, Set<String> blacklist) =>
-      blacklist != null && map.isNotEmpty && blacklist.any(map.containsKey);
+  /// Returns whether any of [map]'s keys are in [blocklist].
+  static bool _needsBlacklist(Map<String, Object> map, Set<String> blocklist) =>
+      blocklist != null && map.isNotEmpty && blocklist.any(map.containsKey);
 
   void setVariable(String name, Value value, AstNode nodeWithSpan) {
     if (!variables.containsKey(name)) {

lib/src/util/limited_map_view.dart

@@ -29,17 +29,17 @@ class LimitedMapView<K, V> extends UnmodifiableMapBase<K, V> {
   bool get isEmpty => _keys.isEmpty;
   bool get isNotEmpty => _keys.isNotEmpty;
 
-  /// Returns a [LimitedMapView] that allows only keys in [whitelist].
+  /// Returns a [LimitedMapView] that allows only keys in [safelist].
   ///
-  /// The [whitelist] must have the same notion of equality as the [map].
-  LimitedMapView.whitelist(this._map, Set<K> whitelist)
-      : _keys = whitelist.intersection(MapKeySet(_map));
+  /// The [safelist] must have the same notion of equality as the [map].
+  LimitedMapView.safelist(this._map, Set<K> safelist)
+      : _keys = safelist.intersection(MapKeySet(_map));
 
-  /// Returns a [LimitedMapView] that doesn't allow keys in [blacklist].
+  /// Returns a [LimitedMapView] that doesn't allow keys in [blocklist].
   ///
-  /// The [blacklist] must have the same notion of equality as the [map].
-  LimitedMapView.blacklist(this._map, Set<K> blacklist)
-      : _keys = {for (var key in _map.keys) if (!blacklist.contains(key)) key};
+  /// The [blocklist] must have the same notion of equality as the [map].
+  LimitedMapView.blocklist(this._map, Set<K> blocklist)
+      : _keys = {for (var key in _map.keys) if (!blocklist.contains(key)) key};
 
   V operator [](Object key) => _keys.contains(key) ? _map[key] : null;
   bool containsKey(Object key) => _keys.contains(key);