1 files changed, 54 insertions, 0 deletions
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/CommaSeparatedPackageNameListConverter.java b/src/main/java/com/google/devtools/build/lib/syntax/CommaSeparatedPackageNameListConverter.java
new file mode 100644
index 0000000000..070e928eb9
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/syntax/CommaSeparatedPackageNameListConverter.java
@@ -0,0 +1,54 @@
+// 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.syntax;
+
+import com.google.common.base.Splitter;
+import com.google.common.base.Strings;
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.cmdline.LabelValidator;
+import com.google.devtools.common.options.Converter;
+import com.google.devtools.common.options.OptionsParsingException;
+
+import java.util.List;
+
+/**
+ * A converter from strings containing comma-separated names of packages to lists of strings.
+ */
+public class CommaSeparatedPackageNameListConverter
+    implements Converter<List<String>> {
+
+  private static final Splitter SPACE_SPLITTER = Splitter.on(',');
+
+  @Override
+  public List<String> convert(String input) throws OptionsParsingException {
+    if (Strings.isNullOrEmpty(input)) {
+      return ImmutableList.of();
+    }
+    ImmutableList.Builder<String> list = ImmutableList.builder();
+    for (String s : SPACE_SPLITTER.split(input)) {
+      String errorMessage = LabelValidator.validatePackageName(s);
+      if (errorMessage != null) {
+        throw new OptionsParsingException(errorMessage);
+      }
+      list.add(s);
+    }
+    return list.build();
+  }
+
+  @Override
+  public String getTypeDescription() {
+    return "comma-separated list of package names";
+  }
+
+}