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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.query2.engine;
import com.google.common.base.Preconditions;
import java.util.Collection;
import java.util.Set;
/**
* A literal set of targets, using 'blaze build' syntax. Or, a reference to a
* variable name. (The syntax of the string "pattern" determines which.)
*
* TODO(bazel-team): Perhaps we should distinguish NAME from WORD in the parser,
* based on the characters in it? Also, perhaps we should not allow NAMEs to
* be quoted like WORDs can be.
*
* <pre>expr ::= NAME | WORD</pre>
*/
final class TargetLiteral extends QueryExpression {
private final String pattern;
TargetLiteral(String pattern) {
this.pattern = Preconditions.checkNotNull(pattern);
}
public boolean isVariableReference() {
return LetExpression.isValidVarReference(pattern);
}
@Override
public <T> Set<T> eval(QueryEnvironment<T> env) throws QueryException {
if (isVariableReference()) {
String varName = LetExpression.getNameFromReference(pattern);
Set<T> value = env.getVariable(varName);
if (value == null) {
throw new QueryException(this, "undefined variable '" + varName + "'");
}
return env.getVariable(varName);
}
return env.getTargetsMatchingPattern(this, pattern);
}
@Override
public void collectTargetPatterns(Collection<String> literals) {
if (!isVariableReference()) {
literals.add(pattern);
}
}
@Override
public String toString() {
// Keep predicate consistent with Lexer.scanWord!
boolean needsQuoting = Lexer.isReservedWord(pattern)
|| pattern.isEmpty()
|| "$-*".indexOf(pattern.charAt(0)) != -1;
return needsQuoting ? ("\"" + pattern + "\"") : pattern;
}
}
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