Migrate struct() to skylarkbuildapi
RELNOTES: None.
PiperOrigin-RevId: 197915097
diff --git a/src/main/java/com/google/devtools/build/lib/packages/StructProvider.java b/src/main/java/com/google/devtools/build/lib/packages/StructProvider.java
new file mode 100644
index 0000000..21f8475
--- /dev/null
+++ b/src/main/java/com/google/devtools/build/lib/packages/StructProvider.java
@@ -0,0 +1,62 @@
+// Copyright 2018 The Bazel Authors. 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.packages;
+
+import com.google.common.collect.ImmutableMap;
+import com.google.devtools.build.lib.events.Location;
+import com.google.devtools.build.lib.skylarkbuildapi.StructApi;
+import com.google.devtools.build.lib.syntax.EvalException;
+import com.google.devtools.build.lib.syntax.SkylarkDict;
+import java.util.Map;
+
+/**
+ * The provider for the built-in type {@code struct}.
+ *
+ * <p>Its singleton instance is {@link StructProvider#STRUCT}.
+ */
+public final class StructProvider extends BuiltinProvider<Info>
+ implements StructApi.StructProviderApi {
+
+ /** "struct" function. */
+ public static final StructProvider STRUCT = new StructProvider();
+
+ StructProvider() {
+ super("struct", Info.class);
+ }
+
+ @Override
+ public Info createStruct(SkylarkDict<?, ?> kwargs, Location loc) throws EvalException {
+ return SkylarkInfo.createSchemaless(
+ this, kwargs.getContents(String.class, Object.class, "kwargs"), loc);
+ }
+
+ /**
+ * Creates a struct with the he given field values and message format for unknown fields.
+ *
+ * <p>The custom message is useful for objects that have fields but aren't exactly used as
+ * providers, such as the {@code native} object, and the struct fields of {@code ctx} like
+ * {@code ctx.attr}.
+ * */
+ public SkylarkInfo create(
+ Map<String, Object> values, String errorMessageFormatForUnknownField) {
+ return SkylarkInfo.createSchemalessWithCustomMessage(
+ this, values, errorMessageFormatForUnknownField);
+ }
+
+ /** Creates an empty struct with the given location. */
+ public SkylarkInfo createEmpty(Location loc) {
+ return SkylarkInfo.createSchemaless(this, ImmutableMap.of(), loc);
+ }
+}
