| // 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.syntax; |
| |
| 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.skylarkinterface.SkylarkPrinter; |
| import com.google.devtools.build.lib.skylarkinterface.SkylarkValue; |
| import java.util.Map; |
| |
| /** |
| * The value passed to a select({...}) statement, e.g.: |
| * |
| * <pre> |
| * rule( |
| * name = 'myrule', |
| * deps = select({ |
| * 'a': [':adep'], |
| * 'b': [':bdep'], |
| * }) |
| * </pre> |
| */ |
| @SkylarkModule( |
| name = "selector", |
| doc = "A selector between configuration-dependent entities.", |
| documented = false |
| ) |
| @AutoCodec |
| public final class SelectorValue implements SkylarkValue { |
| // TODO(bazel-team): Selectors are currently split between .packages and .syntax . They should |
| // really all be in .packages, but then we'd need to figure out a way how to extend binary |
| // operators, which is a non-trivial problem. |
| private final ImmutableMap<?, ?> dictionary; |
| private final Class<?> type; |
| private final String noMatchError; |
| |
| public SelectorValue(Map<?, ?> dictionary, String noMatchError) { |
| this.dictionary = ImmutableMap.copyOf(dictionary); |
| this.type = |
| dictionary.isEmpty() ? Object.class : Iterables.get(dictionary.values(), 0).getClass(); |
| this.noMatchError = noMatchError; |
| } |
| |
| public ImmutableMap<?, ?> getDictionary() { |
| return dictionary; |
| } |
| |
| 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. |
| */ |
| public String getNoMatchError() { |
| return noMatchError; |
| } |
| |
| @Override |
| public String toString() { |
| return Printer.repr(this); |
| } |
| |
| @Override |
| public void repr(SkylarkPrinter printer) { |
| printer.format("select(%r)", dictionary); |
| } |
| } |