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// Copyright 2014 Google Inc. 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 java.util.List;
/**
* An attr(attribute, pattern, argument) filter expression, which computes
* the set of subset of nodes in 'argument' which correspond to rules with
* defined attribute 'attribute' with attribute value matching the unanchored
* regexp 'pattern'. For list attributes, the attribute value will be defined as
* a usual List.toString() representation (using '[' as first character, ']' as
* last character and ", " as a delimiter between multiple values). Also, all
* label-based attributes will use fully-qualified label names instead of
* original value specified in the BUILD file.
*
* <pre>expr ::= ATTR '(' ATTRNAME ',' WORD ',' expr ')'</pre>
*
* Examples
* <pre>
* attr(linkshared,1,//project/...) find all rules under in the //project/... that
* have attribute linkshared set to 1.
* </pre>
*/
class AttrFunction extends RegexFilterExpression {
AttrFunction() {
}
@Override
public String getName() {
return "attr";
}
@Override
protected String getPattern(List<Argument> args) {
return args.get(1).getWord();
}
@Override
public int getMandatoryArguments() {
return 3;
}
@Override
public List<ArgumentType> getArgumentTypes() {
return ImmutableList.of(ArgumentType.WORD, ArgumentType.WORD, ArgumentType.EXPRESSION);
}
@Override
protected <T> String getFilterString(QueryEnvironment<T> env, List<Argument> args, T target) {
throw new IllegalStateException(
"The 'attr' regex filter gets its match values directly from getFilterStrings");
}
@Override
protected <T> Iterable<String> getFilterStrings(QueryEnvironment<T> env,
List<Argument> args, T target) {
if (env.getAccessor().isRule(target)) {
return env.getAccessor().getAttrAsString(target, args.get(0).getWord());
}
return ImmutableList.of();
}
}
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