Update from Google.
--
MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/lib/analysis/RuleDefinitionEnvironment.java b/src/main/java/com/google/devtools/build/lib/analysis/RuleDefinitionEnvironment.java
new file mode 100644
index 0000000..4dcd080
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/analysis/RuleDefinitionEnvironment.java
@@ -0,0 +1,31 @@
+// Copyright 2014 Google Inc. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package com.google.devtools.build.lib.analysis;
+
+import com.google.devtools.build.lib.syntax.Label;
+
+/**
+ * Encapsulates the services available for implementors of the {@link RuleDefinition}
+ * interface.
+ */
+public interface RuleDefinitionEnvironment {
+ /**
+ * Parses the given string as a label and returns the label, by calling {@link
+ * Label#parseAbsolute}. Instead of throwing a {@link
+ * com.google.devtools.build.lib.syntax.Label.SyntaxException}, it throws an {@link
+ * IllegalArgumentException}, if the parsing fails.
+ */
+ Label getLabel(String labelValue);
+}
