Precompute `IgnoreInfo` in Scanner.

pkg/analyzer/lib/src/generated/source.dart

Index: pkg/analyzer/lib/src/generated/source.dart
diff --git a/pkg/analyzer/lib/src/generated/source.dart b/pkg/analyzer/lib/src/generated/source.dart
index 4ba4c51a1060f86001605bdf29801a90cb7f9b0a..f66bc24cd9ffea81d7323a232a5c4a4e7e4fd1f3 100644
--- a/pkg/analyzer/lib/src/generated/source.dart
+++ b/pkg/analyzer/lib/src/generated/source.dart
@@ -177,6 +177,36 @@ class DartUriResolver extends UriResolver {
 }
 
 /**
+ * Information about analysis `//ignore:` comments within a source file.
+ */
+class IgnoreInfo {

[scheglov, 2016/05/27 18:05:47]

This could live in src/dart.dart

[pquitslund, 2016/05/27 21:50:53]

Done.

+  final Map<int, List<String>> _ignoreMap = new HashMap<int, List<String>>();
+
+  /**
+   * Map of line numbers to associated ignored error codes.
+   */
+  Map<int, Iterable<String>> get ignores => _ignoreMap;
+
+  /**
+   * Ignore this [errorCode] at [line].
+   */
+  void add(int line, String errorCode) {
+    _ignoreMap.putIfAbsent(line, () => new List<String>()).add(errorCode);
+  }
+
+  /**
+   * Whether this info object defines any ignores.
+   */
+  bool get hasIgnores => ignores.length > 0;

[scheglov, 2016/05/27 18:05:47]

=> ignores.isNotEmpty;

[pquitslund, 2016/05/27 21:50:53]

Done.

+
+  /**
+   * Test whether this [errorCode] is ignored at the given [line].
+   */
+  bool ignoredAt(String errorCode, int line) =>
+      _ignoreMap[line]?.contains(errorCode) == true;
+}
+
+/**
  * Information about line and column information within a source file.
  */
 class LineInfo {