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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.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);
}
}
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