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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 static com.google.devtools.build.lib.syntax.compiler.ByteCodeUtils.append;
import com.google.common.collect.ImmutableMap;
import com.google.devtools.build.lib.syntax.compiler.ByteCodeMethodCalls;
import com.google.devtools.build.lib.syntax.compiler.ByteCodeUtils;
import com.google.devtools.build.lib.syntax.compiler.DebugInfo;
import com.google.devtools.build.lib.syntax.compiler.DebugInfo.AstAccessors;
import com.google.devtools.build.lib.syntax.compiler.Variable.InternalVariable;
import com.google.devtools.build.lib.syntax.compiler.VariableScope;
import net.bytebuddy.implementation.bytecode.ByteCodeAppender;
import net.bytebuddy.implementation.bytecode.Duplication;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
/**
* Syntax node for dictionary comprehension expressions.
*/
public class DictComprehension extends AbstractComprehension {
private final Expression keyExpression;
private final Expression valueExpression;
public DictComprehension(Expression keyExpression, Expression valueExpression) {
super('{', '}', keyExpression, valueExpression);
this.keyExpression = keyExpression;
this.valueExpression = valueExpression;
}
@Override
String printExpressions() {
return String.format("%s: %s", keyExpression, valueExpression);
}
@Override
OutputCollector createCollector(Environment env) {
return new DictOutputCollector(env);
}
@Override
InternalVariable compileInitialization(VariableScope scope, List<ByteCodeAppender> code) {
InternalVariable dict = scope.freshVariable(ImmutableMap.class);
append(code, scope.loadEnvironment(), ByteCodeMethodCalls.BCSkylarkDict.of);
code.add(dict.store());
return dict;
}
@Override
ByteCodeAppender compileCollector(
VariableScope scope,
InternalVariable collection,
DebugInfo debugInfo,
AstAccessors debugAccessors)
throws EvalException {
List<ByteCodeAppender> code = new ArrayList<>();
append(code, collection.load());
code.add(keyExpression.compile(scope, debugInfo));
append(code, Duplication.SINGLE, EvalUtils.checkValidDictKey);
code.add(valueExpression.compile(scope, debugInfo));
append(code,
debugInfo.add(this).loadLocation,
scope.loadEnvironment(),
ByteCodeMethodCalls.BCSkylarkDict.put);
return ByteCodeUtils.compoundAppender(code);
}
@Override
ByteCodeAppender compileBuilding(VariableScope scope, InternalVariable collection) {
return new ByteCodeAppender.Simple(collection.load());
}
/**
* 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.<Object, Object>of(env);
}
@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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