| // 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; |
| } |
| } |
| } |