Add a PathFilter to each context in analysis_server

pkg/analysis_server/lib/src/context_manager.dart

Index: pkg/analysis_server/lib/src/context_manager.dart
diff --git a/pkg/analysis_server/lib/src/context_manager.dart b/pkg/analysis_server/lib/src/context_manager.dart
index fc93e96ec3b5d302ee074d6c356ed0a982353e09..241b9f16b9716373d7952893ceb73eff5f24a697 100644
--- a/pkg/analysis_server/lib/src/context_manager.dart
+++ b/pkg/analysis_server/lib/src/context_manager.dart
@@ -14,6 +14,7 @@ import 'package:analysis_server/uri/resolver_provider.dart';
 import 'package:analyzer/file_system/file_system.dart';
 import 'package:analyzer/instrumentation/instrumentation.dart';
 import 'package:analyzer/source/package_map_resolver.dart';
+import 'package:analyzer/source/path_filter.dart';
 import 'package:analyzer/src/generated/engine.dart';
 import 'package:analyzer/src/generated/java_io.dart';
 import 'package:analyzer/src/generated/source.dart';
@@ -163,6 +164,16 @@ abstract class AbstractContextManager implements ContextManager {
     // Do nothing.
   }
 
+  // Sets the [ignorePatterns] for the context [folder].
+  void setIgnorePatternsForContext(Folder folder, List<String> ignorePatterns) {
+    _ContextInfo info = _contexts[folder];
+    if (info == null) {
+      return;
+    }
+    var pathFilter = info.pathFilter;
+    pathFilter.setIgnorePatterns(ignorePatterns);
+  }
+
   @override
   bool isInAnalysisRoot(String path) {
     // check if excluded
@@ -318,6 +329,10 @@ abstract class AbstractContextManager implements ContextManager {
     }
     for (Resource child in children) {
       String path = child.path;
+      // Path is being ignored.
+      if (info.ignored(path)) {
+        continue;
+      }
       // add files, recurse into folders
       if (child is File) {
         // ignore if should not be analyzed at all
@@ -361,7 +376,7 @@ abstract class AbstractContextManager implements ContextManager {
     for (Resource child in children) {
       String path = child.path;
       // ignore excluded files or folders
-      if (_isExcluded(path) || info.excludes(path)) {
+      if (_isExcluded(path) || info.excludes(path) || info.ignored(path)) {
         continue;
       }
       // add files, recurse into folders
@@ -606,6 +621,9 @@ abstract class AbstractContextManager implements ContextManager {
     if (info.excludes(path)) {
       return;
     }
+    if (info.ignored(path)) {
+      return;
+    }
     // handle the change
     switch (event.type) {
       case ChangeType.ADD:
@@ -859,6 +877,9 @@ class _ContextInfo {
    */
   final Folder folder;
 
+  /// The [PathFilter] used to filter sources from being analyzed.
+  final PathFilter pathFilter;
+
   /**
    * The enclosed pubspec-based contexts.
    */
@@ -910,7 +931,9 @@ class _ContextInfo {
    */
   OptimizingPubPackageMapInfo packageMapInfo;
 
-  _ContextInfo(this.folder, File pubspecFile, this.children, this.packageRoot) {
+  _ContextInfo(Folder folder, File pubspecFile, this.children, this.packageRoot)
+      : folder = folder,
+        pathFilter = new PathFilter(folder.path, null) {
     pubspecPath = pubspecFile.path;
     for (_ContextInfo child in children) {
       child.parent = this;
@@ -931,6 +954,9 @@ class _ContextInfo {
     });
   }
 
+  /// Returns `true` if  [path] should be ignored.
+  bool ignored(String path) => pathFilter.ignored(path);
+
   /**
    * Returns `true` if [resource] is excluded, as it is in one of the children.
    */