| // 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.packages; |
| |
| import com.google.common.base.Preconditions; |
| import com.google.common.collect.ImmutableMap; |
| import com.google.common.collect.Iterables; |
| import com.google.devtools.build.lib.skyframe.serialization.autocodec.AutoCodec; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkModule; |
| import com.google.devtools.build.lib.syntax.EvalException; |
| import com.google.devtools.build.lib.syntax.HasBinary; |
| import com.google.devtools.build.lib.syntax.Printer; |
| import com.google.devtools.build.lib.syntax.Starlark; |
| import com.google.devtools.build.lib.syntax.StarlarkValue; |
| import com.google.devtools.build.lib.syntax.TokenKind; |
| import java.util.Map; |
| |
| /** |
| * The value returned by a call to {@code select({...})}, for example: |
| * |
| * <pre> |
| * rule( |
| * name = 'myrule', |
| * deps = select({ |
| * 'a': [':adep'], |
| * 'b': [':bdep'], |
| * }) |
| * </pre> |
| */ |
| @SkylarkModule( |
| name = "selector", |
| doc = "A selector between configuration-dependent values.", |
| documented = false) |
| @AutoCodec |
| public final class SelectorValue implements StarlarkValue, HasBinary { |
| |
| // TODO(adonovan): combine Selector{List,Value} and BuildType.SelectorList. |
| // We don't need three classes for the same concept. |
| |
| private final ImmutableMap<?, ?> dictionary; |
| private final Class<?> type; |
| private final String noMatchError; |
| |
| SelectorValue(Map<?, ?> dictionary, String noMatchError) { |
| Preconditions.checkArgument(!dictionary.isEmpty()); |
| this.dictionary = ImmutableMap.copyOf(dictionary); |
| // TODO(adonovan): doesn't this assume all the elements have the same type? |
| this.type = Iterables.getFirst(dictionary.values(), null).getClass(); |
| this.noMatchError = noMatchError; |
| } |
| |
| ImmutableMap<?, ?> getDictionary() { |
| return dictionary; |
| } |
| |
| // TODO(adonovan): use SkylarkType not Class, like Depset. |
| Class<?> getType() { |
| return type; |
| } |
| |
| /** |
| * Returns a custom error message for this select when no condition matches, or an empty string if |
| * no such message is declared. |
| */ |
| String getNoMatchError() { |
| return noMatchError; |
| } |
| |
| @Override |
| public String toString() { |
| return Starlark.repr(this); |
| } |
| |
| @Override |
| public SelectorList binaryOp(TokenKind op, Object that, boolean thisLeft) throws EvalException { |
| if (op == TokenKind.PLUS) { |
| return thisLeft ? SelectorList.concat(this, that) : SelectorList.concat(that, this); |
| } |
| return null; |
| } |
| |
| @Override |
| public void repr(Printer printer) { |
| printer.format("select(%r)", dictionary); |
| } |
| } |