Analyzer snapshot.

editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java

Index: editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java
diff --git a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java
index a3edb699aade5b288009efc16d33e78508f6a4a8..c3fef19b286f3271455124f6a503f38ca50d5197 100644
--- a/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java
+++ b/editor/tools/plugins/com.google.dart.engine/src/com/google/dart/engine/internal/builder/AngularCompilationUnitBuilder.java
@@ -125,6 +125,25 @@ public class AngularCompilationUnitBuilder {
     return false;
   }
 
+  public static boolean isTagName(String s) {
+    if (s == null || s.length() == 0) {
+      return false;
+    }
+    int sz = s.length();
+    for (int i = 0; i < sz; i++) {
+      char c = s.charAt(i);
+      if (!Character.isLetter(c)) {
+        if (i == 0) {
+          return false;
+        }
+        if (!Character.isDigit(c) && c != '-') {
+          return false;
+        }
+      }
+    }
+    return true;
+  }
+
   /**
    * Parses given selector text and returns {@link AngularSelector}. May be {@code null} if cannot
    * parse.