1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
|
// 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.query2.engine;
import com.google.common.collect.ImmutableList;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.Argument;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.ArgumentType;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryFunction;
import com.google.devtools.build.lib.query2.engine.QueryEnvironment.QueryTaskFuture;
import java.util.ArrayList;
import java.util.List;
/**
* A label(attr_name, argument) expression, which computes the set of targets whose labels appear in
* the specified attribute of some rule in 'argument'.
*
* <pre>expr ::= LABELS '(' WORD ',' expr ')'</pre>
*
* Example:
*
* <pre>
* labels(srcs, //foo) The 'srcs' source files to the //foo rule.
* </pre>
*/
public class LabelsFunction implements QueryFunction {
LabelsFunction() {
}
@Override
public String getName() {
return "labels";
}
@Override
public int getMandatoryArguments() {
return 2;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.WORD, ArgumentType.EXPRESSION);
}
@Override
public <T> QueryTaskFuture<Void> eval(
final QueryEnvironment<T> env,
QueryExpressionContext<T> context,
final QueryExpression expression,
final List<Argument> args,
final Callback<T> callback) {
final String attrName = args.get(0).getWord();
final Uniquifier<T> uniquifier = env.createUniquifier();
return env.eval(args.get(1).getExpression(), context, new Callback<T>() {
@Override
public void process(Iterable<T> partialResult) throws QueryException, InterruptedException {
for (T input : partialResult) {
if (env.getAccessor().isRule(input)) {
List<T> targets = uniquifier.unique(
env.getAccessor().getLabelListAttr(expression, input, attrName,
"in '" + attrName + "' of rule " + env.getAccessor().getLabel(input) + ": "));
List<T> result = new ArrayList<>(targets.size());
for (T target : targets) {
result.add(env.getOrCreate(target));
}
callback.process(result);
}
}
}
});
}
}
|
