| // 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.syntax; |
| |
| import com.google.common.collect.ImmutableMap; |
| |
| /** This class contains Bazel-specific functions to extend or interoperate with Skylark. */ |
| public final class SkylarkUtils { |
| |
| /** Bazel-specific information that we store in the Environment. */ |
| private static class BazelInfo { |
| String toolsRepository; |
| ImmutableMap<String, Class<?>> fragmentNameToClass; |
| Object lipoDataTransition; |
| } |
| |
| private static final String BAZEL_INFO_KEY = "$bazel"; |
| |
| private static BazelInfo getInfo(Environment env) { |
| Object info = env.lookup(BAZEL_INFO_KEY); |
| if (info != null) { |
| return (BazelInfo) info; |
| } |
| |
| BazelInfo result = new BazelInfo(); |
| try { |
| env.update(BAZEL_INFO_KEY, result); |
| return result; |
| } catch (EvalException e) { |
| throw new AssertionError(e); |
| } |
| } |
| |
| public static void setToolsRepository(Environment env, String toolsRepository) { |
| getInfo(env).toolsRepository = toolsRepository; |
| } |
| |
| public static String getToolsRepository(Environment env) { |
| return getInfo(env).toolsRepository; |
| } |
| |
| /** |
| * Sets, on an {@link Environment}, a {@link Map} from configuration fragment name to |
| * configuration fragment class. |
| */ |
| public static void setFragmentMap(Environment env, |
| ImmutableMap<String, Class<?>> fragmentNameToClass) { |
| getInfo(env).fragmentNameToClass = fragmentNameToClass; |
| } |
| |
| /** |
| * Returns the {@link Map} from configuration fragment name to configuration fragment class, as |
| * set by {@link #setFragmentMap}. |
| */ |
| public static ImmutableMap<String, Class<?>> getFragmentMap(Environment env) { |
| return getInfo(env).fragmentNameToClass; |
| } |
| |
| /** |
| * Sets the configuration transition to apply to <code>cfg = "data"</code> attributes. |
| * |
| * <p>This must be a |
| * {@link com.google.devtools.build.lib.analysis.config.transitions.PatchTransition}. But that |
| * class isn't available in <code>lib.syntax</code>, so we can't type-check it here. |
| */ |
| public static void setLipoDataTransition(Environment env, Object lipoDataTransition) { |
| getInfo(env).lipoDataTransition = lipoDataTransition; |
| } |
| |
| /** |
| * Returns the configuration transition to apply to <code>cfg = "data"</code> attributes. |
| * |
| * <p>This is always a |
| * {@link com.google.devtools.build.lib.analysis.config.transitions.PatchTransition}. |
| */ |
| public static Object getLipoDataTransition(Environment env) { |
| return getInfo(env).lipoDataTransition; |
| } |
| } |