001    /*
002     * Copyright 2010-2013 JetBrains s.r.o.
003     *
004     * Licensed under the Apache License, Version 2.0 (the "License");
005     * you may not use this file except in compliance with the License.
006     * You may obtain a copy of the License at
007     *
008     * http://www.apache.org/licenses/LICENSE-2.0
009     *
010     * Unless required by applicable law or agreed to in writing, software
011     * distributed under the License is distributed on an "AS IS" BASIS,
012     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
013     * See the License for the specific language governing permissions and
014     * limitations under the License.
015     */
016    
017    package org.jetbrains.k2js.translate.utils.dangerous;
018    
019    import com.google.common.collect.Maps;
020    import com.google.dart.compiler.backend.js.ast.JsExpression;
021    import com.google.dart.compiler.backend.js.ast.JsName;
022    import com.google.dart.compiler.backend.js.ast.JsNode;
023    import org.jetbrains.annotations.NotNull;
024    import org.jetbrains.jet.lang.psi.JetExpression;
025    import org.jetbrains.k2js.translate.context.TemporaryVariable;
026    import org.jetbrains.k2js.translate.context.TranslationContext;
027    import org.jetbrains.k2js.translate.general.AbstractTranslator;
028    import org.jetbrains.k2js.translate.general.Translation;
029    
030    import java.util.List;
031    import java.util.Map;
032    
033    public final class DangerousTranslator extends AbstractTranslator {
034        @NotNull
035        private final DangerousData data;
036    
037        @NotNull
038        public static JsNode translate(@NotNull DangerousData data, @NotNull TranslationContext context) {
039            assert data.exists();
040            return new DangerousTranslator(data, context).translate();
041        }
042    
043        private DangerousTranslator(@NotNull DangerousData data, @NotNull TranslationContext context) {
044            super(context);
045            this.data = data;
046        }
047    
048        @NotNull
049        private JsNode translate() {
050            Map<JetExpression, JsName> aliasesForExpressions =
051                translateAllExpressionsAndCreateAliasesForThem(data.getNodesToBeGeneratedBefore());
052            TranslationContext contextWithAliases = context().innerContextWithAliasesForExpressions(aliasesForExpressions);
053            return Translation.doTranslateExpression(data.getRootNode(), contextWithAliases);
054        }
055    
056        @NotNull
057        private Map<JetExpression, JsName> translateAllExpressionsAndCreateAliasesForThem(@NotNull List<JetExpression> expressions) {
058            Map<JetExpression, JsName> aliasesForExpressions = Maps.newHashMap();
059            for (JetExpression expression : expressions) {
060                JsExpression translatedExpression = Translation.translateAsExpression(expression, context());
061                TemporaryVariable aliasForExpression = context().declareTemporary(translatedExpression);
062                context().addStatementToCurrentBlock(aliasForExpression.assignmentExpression().makeStmt());
063                aliasesForExpressions.put(expression, aliasForExpression.name());
064            }
065            return aliasesForExpressions;
066        }
067    }