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// Copyright 2014 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.analysis.skylark;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.packages.BazelLibrary;
import com.google.devtools.build.lib.packages.SkylarkNativeModule;
import com.google.devtools.build.lib.syntax.Environment;
import com.google.devtools.build.lib.syntax.Environment.GlobalFrame;
import com.google.devtools.build.lib.syntax.Mutability;
import com.google.devtools.build.lib.syntax.Runtime;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
/**
* The basis for a Skylark Environment with all build-related modules registered.
*/
public final class SkylarkModules {
private SkylarkModules() { }
/**
* The list of built in Skylark modules. Documentation is generated automatically for all these
* modules. They are also registered with the {@link Environment}.
*/
public static final ImmutableList<Class<?>> MODULES =
ImmutableList.of(
BazelBuildApiGlobals.class,
SkylarkAttr.class,
SkylarkCommandLine.class,
SkylarkNativeModule.class,
SkylarkRuleClassFunctions.class);
/** Global bindings for all Skylark modules */
private static final Map<List<Class<?>>, GlobalFrame> cache = new HashMap<>();
public static Environment.GlobalFrame getGlobals(List<Class<?>> modules) {
if (!cache.containsKey(modules)) {
cache.put(modules, createGlobals(modules));
}
return cache.get(modules);
}
private static Environment.GlobalFrame createGlobals(List<Class<?>> modules) {
try (Mutability mutability = Mutability.create("SkylarkModules")) {
Environment env = Environment.builder(mutability)
.useDefaultSemantics()
.setGlobals(BazelLibrary.GLOBALS)
.build();
for (Class<?> moduleClass : modules) {
Runtime.setupModuleGlobals(env, moduleClass);
}
return env.getGlobals();
}
}
}
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