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.dart.compiler.backend.js.ast.JsExpression;
020    import com.google.dart.compiler.backend.js.ast.JsName;
021    import com.google.dart.compiler.backend.js.ast.JsNode;
022    import com.google.dart.compiler.backend.js.ast.JsVars;
023    import gnu.trove.THashMap;
024    import org.jetbrains.annotations.NotNull;
025    import org.jetbrains.jet.lang.psi.JetExpression;
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.ArrayList;
031    import java.util.List;
032    import java.util.Map;
033    
034    public final class DangerousTranslator extends AbstractTranslator {
035        @NotNull
036        private final DangerousData data;
037    
038        @NotNull
039        public static JsNode translate(@NotNull DangerousData data, @NotNull TranslationContext context) {
040            assert data.exists();
041            return new DangerousTranslator(data, context).translate();
042        }
043    
044        private DangerousTranslator(@NotNull DangerousData data, @NotNull TranslationContext context) {
045            super(context);
046            this.data = data;
047        }
048    
049        @NotNull
050        private JsNode translate() {
051            Map<JetExpression, JsName> aliasesForExpressions =
052                translateAllExpressionsAndCreateAliasesForThem(data.getNodesToBeGeneratedBefore());
053            TranslationContext contextWithAliases = context().innerContextWithAliasesForExpressions(aliasesForExpressions);
054            return Translation.doTranslateExpression(data.getRootNode(), contextWithAliases);
055        }
056    
057        @NotNull
058        private Map<JetExpression, JsName> translateAllExpressionsAndCreateAliasesForThem(@NotNull List<JetExpression> expressions) {
059            Map<JetExpression, JsName> aliasesForExpressions = new THashMap<JetExpression, JsName>(expressions.size());
060            List<JsVars.JsVar> vars = new ArrayList<JsVars.JsVar>(expressions.size());
061            for (JetExpression expression : expressions) {
062                JsExpression translatedExpression = Translation.translateAsExpression(expression, context());
063                JsVars.JsVar aliasForExpression = context().dynamicContext().createTemporaryVar(translatedExpression);
064                vars.add(aliasForExpression);
065                aliasesForExpressions.put(expression, aliasForExpression.getName());
066            }
067            context().addStatementToCurrentBlock(new JsVars(vars, true));
068            return aliasesForExpressions;
069        }
070    }