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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.base.Preconditions;
import com.google.devtools.build.lib.events.Location;
import java.io.IOException;
import java.util.List;
import java.util.Map;
/** Syntax node for dictionary comprehension expressions. */
public final class DictComprehension extends AbstractComprehension {
private final Expression keyExpression;
private final Expression valueExpression;
public DictComprehension(
List<Clause> clauses, Expression keyExpression, Expression valueExpression) {
super(clauses, keyExpression, valueExpression);
this.keyExpression = keyExpression;
this.valueExpression = valueExpression;
}
@Override
protected char openingBracket() {
return '{';
}
@Override
protected char closingBracket() {
return '}';
}
public Expression getKeyExpression() {
return keyExpression;
}
public Expression getValueExpression() {
return valueExpression;
}
@Override
protected void printExpressions(Appendable buffer) throws IOException {
keyExpression.prettyPrint(buffer);
buffer.append(": ");
valueExpression.prettyPrint(buffer);
}
/** Builder for {@link DictComprehension}. */
public static class Builder extends AbstractBuilder {
private Expression keyExpression;
private Expression valueExpression;
public Builder setKeyExpression(Expression keyExpression) {
this.keyExpression = keyExpression;
return this;
}
public Builder setValueExpression(Expression valueExpression) {
this.valueExpression = valueExpression;
return this;
}
@Override
public DictComprehension build() {
Preconditions.checkState(!clauses.isEmpty());
return new DictComprehension(
clauses,
Preconditions.checkNotNull(keyExpression),
Preconditions.checkNotNull(valueExpression));
}
}
@Override
OutputCollector createCollector(Environment env) {
return new DictOutputCollector(env);
}
/**
* Helper class that collects the intermediate results of the {@link DictComprehension} and
* provides access to the resulting {@link Map}.
*/
private final class DictOutputCollector implements OutputCollector {
private final SkylarkDict<Object, Object> result;
DictOutputCollector(Environment env) {
// We want to keep the iteration order
result = SkylarkDict.of(env);
}
@Override
public Location getLocation() {
return DictComprehension.this.getLocation();
}
@Override
public List<Clause> getClauses() {
return DictComprehension.this.getClauses();
}
@Override
public void evaluateAndCollect(Environment env) throws EvalException, InterruptedException {
Object key = keyExpression.eval(env);
EvalUtils.checkValidDictKey(key);
result.put(key, valueExpression.eval(env), getLocation(), env);
}
@Override
public Object getResult(Environment env) throws EvalException {
return result;
}
}
}
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