001    /*
002     * Copyright 2010-2016 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.kotlin.js.translate.operation;
018    
019    import org.jetbrains.annotations.NotNull;
020    import org.jetbrains.kotlin.js.backend.ast.*;
021    import org.jetbrains.kotlin.js.translate.context.TranslationContext;
022    import org.jetbrains.kotlin.lexer.KtToken;
023    import org.jetbrains.kotlin.lexer.KtTokens;
024    import org.jetbrains.kotlin.psi.KtUnaryExpression;
025    
026    import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.getOperationToken;
027    import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.isPrefix;
028    import static org.jetbrains.kotlin.js.translate.utils.TranslationUtils.isSimpleNameExpressionNotDelegatedLocalVar;
029    
030    public class DynamicIncrementTranslator extends IncrementTranslator {
031    
032        @NotNull
033        public static JsExpression doTranslate(@NotNull KtUnaryExpression expression,
034                @NotNull TranslationContext context) {
035            return (new DynamicIncrementTranslator(expression, context))
036                    .translate();
037        }
038    
039        private DynamicIncrementTranslator(@NotNull KtUnaryExpression expression,
040                @NotNull TranslationContext context) {
041            super(expression, context);
042        }
043    
044        @NotNull
045        private JsExpression translate() {
046            if (isSimpleNameExpressionNotDelegatedLocalVar(expression.getBaseExpression(), context())) {
047                return primitiveExpressionIncrement();
048            }
049            return translateIncrementExpression();
050        }
051    
052        @NotNull
053        private JsExpression primitiveExpressionIncrement() {
054            JsUnaryOperator operator = OperatorTable.getUnaryOperator(getOperationToken(expression));
055            JsExpression getExpression = accessTranslator.translateAsGet();
056            if (isPrefix(expression)) {
057                return new JsPrefixOperation(operator, getExpression);
058            }
059            else {
060                return new JsPostfixOperation(operator, getExpression);
061            }
062        }
063    
064        @Override
065        @NotNull
066        protected JsExpression operationExpression(@NotNull JsExpression receiver) {
067            return unaryAsBinary(receiver);
068        }
069    
070        @NotNull
071        private JsBinaryOperation unaryAsBinary(@NotNull JsExpression leftExpression) {
072            JsNumberLiteral oneLiteral = program().getNumberLiteral(1);
073            KtToken token = getOperationToken(expression);
074            if (token.equals(KtTokens.PLUSPLUS)) {
075                return new JsBinaryOperation(JsBinaryOperator.ADD, leftExpression, oneLiteral);
076            }
077            if (token.equals(KtTokens.MINUSMINUS)) {
078                return new JsBinaryOperation(JsBinaryOperator.SUB, leftExpression, oneLiteral);
079            }
080            throw new AssertionError("This method should be called only for increment and decrement operators");
081        }
082    
083    }