// Copyright 2016 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.annotations.VisibleForTesting;
import com.google.common.base.Preconditions;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.cmdline.Label;
import com.google.devtools.build.lib.events.Location;
import com.google.devtools.build.lib.packages.SkylarkInfo.Layout;
import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec;
import com.google.devtools.build.lib.skylarkinterface.SkylarkPrinter;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.FunctionSignature;
import com.google.devtools.build.lib.syntax.SkylarkType;
import java.util.Map;
import java.util.Objects;
import javax.annotation.Nullable;
/**
* A provider defined in Skylark rather than in native code.
*
*
This is a result of calling the {@code provider()} function from Skylark ({@link
* com.google.devtools.build.lib.analysis.skylark.SkylarkRuleClassFunctions#provider}).
*
*
{@code SkylarkProvider}s may be either schemaless or schemaful. Instances of schemaless
* providers can have any set of fields on them, whereas instances of schemaful providers may have
* only the fields that are named in the schema. Schemaful provider instances are more space
* efficient since they do not use maps; see {@link SkylarkInfo}.
*
*
Exporting a {@code SkylarkProvider} creates a key that is used to uniquely identify it.
* Usually a provider is exported by calling {@link #export}, but a test may wish to just create a
* pre-exported provider directly. Exported providers use only their key for {@link #equals} and
* {@link #hashCode}.
*/
public class SkylarkProvider extends ProviderFromFunction implements SkylarkExportable {
private static final FunctionSignature.WithValues