Update from Google.
--
MOE_MIGRATED_REVID=85702957
diff --git a/src/main/java/com/google/devtools/build/lib/syntax/LoadStatement.java b/src/main/java/com/google/devtools/build/lib/syntax/LoadStatement.java
new file mode 100644
index 0000000..6873995
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/syntax/LoadStatement.java
@@ -0,0 +1,78 @@
+// 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.Joiner;
+import com.google.common.collect.ImmutableList;
+import com.google.devtools.build.lib.vfs.PathFragment;
+
+import java.util.List;
+
+/**
+ * Syntax node for an import statement.
+ */
+public final class LoadStatement extends Statement {
+
+ private final ImmutableList<Ident> symbols;
+ private final PathFragment importPath;
+
+ /**
+ * Constructs an import statement.
+ */
+ LoadStatement(String path, List<Ident> symbols) {
+ this.symbols = ImmutableList.copyOf(symbols);
+ this.importPath = new PathFragment(path + ".bzl");
+ }
+
+ public ImmutableList<Ident> getSymbols() {
+ return symbols;
+ }
+
+ public PathFragment getImportPath() {
+ return importPath;
+ }
+
+ @Override
+ public String toString() {
+ return String.format("load(\"%s\", %s)", importPath, Joiner.on(", ").join(symbols));
+ }
+
+ @Override
+ void exec(Environment env) throws EvalException, InterruptedException {
+ for (Ident i : symbols) {
+ try {
+ if (i.getName().startsWith("_")) {
+ throw new EvalException(getLocation(), "symbol '" + i + "' is private and cannot "
+ + "be imported");
+ }
+ env.importSymbol(getImportPath(), i.getName());
+ } catch (Environment.NoSuchVariableException | Environment.LoadFailedException e) {
+ throw new EvalException(getLocation(), e.getMessage());
+ }
+ }
+ }
+
+ @Override
+ public void accept(SyntaxTreeVisitor visitor) {
+ visitor.visit(this);
+ }
+
+ @Override
+ void validate(ValidationEnvironment env) throws EvalException {
+ // TODO(bazel-team): implement semantical check.
+ for (Ident symbol : symbols) {
+ env.update(symbol.getName(), SkylarkType.UNKNOWN, getLocation());
+ }
+ }
+}
