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.expression;
018    
019    import com.google.dart.compiler.backend.js.ast.*;
020    import com.intellij.util.SmartList;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.jet.lang.psi.*;
024    import org.jetbrains.k2js.translate.context.TranslationContext;
025    import org.jetbrains.k2js.translate.general.AbstractTranslator;
026    import org.jetbrains.k2js.translate.general.Translation;
027    
028    import java.util.List;
029    
030    import static org.jetbrains.k2js.translate.utils.JsAstUtils.convertToBlock;
031    
032    //TODO: not tested at all
033    //TODO: not implemented catch logic
034    public final class TryTranslator extends AbstractTranslator {
035    
036        @NotNull
037        public static JsTry translate(@NotNull JetTryExpression expression,
038                                      @NotNull TranslationContext context) {
039            return (new TryTranslator(expression, context)).translate();
040        }
041    
042        @NotNull
043        private final JetTryExpression expression;
044    
045        private TryTranslator(@NotNull JetTryExpression expression,
046                              @NotNull TranslationContext context) {
047            super(context);
048            this.expression = expression;
049        }
050    
051        private JsTry translate() {
052            return new JsTry(translateTryBlock(), translateCatches(), translateFinallyBlock());
053        }
054    
055        @Nullable
056        private JsBlock translateFinallyBlock() {
057            JetFinallySection finallyBlock = expression.getFinallyBlock();
058            if (finallyBlock == null) return null;
059    
060            return convertToBlock(Translation.translateAsStatement(finallyBlock.getFinalExpression(), context()));
061        }
062    
063        @NotNull
064        private JsBlock translateTryBlock() {
065            return convertToBlock(Translation.translateAsStatement(expression.getTryBlock(), context()));
066        }
067    
068        @NotNull
069        private List<JsCatch> translateCatches() {
070            List<JsCatch> result = new SmartList<JsCatch>();
071            for (JetCatchClause catchClause : expression.getCatchClauses()) {
072                result.add(translateCatchClause(catchClause));
073            }
074            return result;
075        }
076    
077        @NotNull
078        private JsCatch translateCatchClause(@NotNull JetCatchClause catchClause) {
079            JetParameter catchParameter = catchClause.getCatchParameter();
080            assert catchParameter != null : "Valid catch must have a parameter.";
081    
082            JsName parameterName = context().getNameForElement(catchParameter);
083            JsCatch result = new JsCatch(context().scope(), parameterName.getIdent());
084            result.setBody(translateCatchBody(catchClause));
085            return result;
086        }
087    
088        @NotNull
089        private JsBlock translateCatchBody(@NotNull JetCatchClause catchClause) {
090            JetExpression catchBody = catchClause.getCatchBody();
091            if (catchBody == null) {
092                return convertToBlock(program().getEmptyStmt());
093            }
094            return convertToBlock(Translation.translateAsStatement(catchBody, context()));
095        }
096    
097    }