001    /*
002     * Copyright 2010-2015 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 com.google.dart.compiler.backend.js.ast.*;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.kotlin.js.translate.context.TranslationContext;
022    import org.jetbrains.kotlin.lexer.JetToken;
023    import org.jetbrains.kotlin.lexer.JetTokens;
024    import org.jetbrains.kotlin.psi.JetSimpleNameExpression;
025    import org.jetbrains.kotlin.psi.JetUnaryExpression;
026    
027    import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.getOperationToken;
028    import static org.jetbrains.kotlin.js.translate.utils.PsiUtils.isPrefix;
029    
030    
031    public final class IntrinsicIncrementTranslator extends IncrementTranslator {
032    
033        @NotNull
034        public static JsExpression doTranslate(@NotNull JetUnaryExpression expression,
035                                               @NotNull TranslationContext context) {
036            return (new IntrinsicIncrementTranslator(expression, context))
037                    .translate();
038        }
039    
040        private IntrinsicIncrementTranslator(@NotNull JetUnaryExpression expression,
041                                             @NotNull TranslationContext context) {
042            super(expression, context);
043        }
044    
045        @NotNull
046        private JsExpression translate() {
047            if (isPrimitiveExpressionIncrement()) {
048                return primitiveExpressionIncrement();
049            }
050            return translateIncrementExpression();
051        }
052    
053        private boolean isPrimitiveExpressionIncrement() {
054            return expression.getBaseExpression() instanceof JetSimpleNameExpression;
055        }
056    
057        @NotNull
058        private JsExpression primitiveExpressionIncrement() {
059            JsUnaryOperator operator = OperatorTable.getUnaryOperator(getOperationToken(expression));
060            JsExpression getExpression = accessTranslator.translateAsGet();
061            if (isPrefix(expression)) {
062                return new JsPrefixOperation(operator, getExpression);
063            }
064            else {
065                return new JsPostfixOperation(operator, getExpression);
066            }
067        }
068    
069        @Override
070        @NotNull
071        protected JsExpression operationExpression(@NotNull JsExpression receiver) {
072            return unaryAsBinary(receiver);
073        }
074    
075        @NotNull
076        private JsBinaryOperation unaryAsBinary(@NotNull JsExpression leftExpression) {
077            JsNumberLiteral oneLiteral = program().getNumberLiteral(1);
078            JetToken token = getOperationToken(expression);
079            if (token.equals(JetTokens.PLUSPLUS)) {
080                return new JsBinaryOperation(JsBinaryOperator.ADD, leftExpression, oneLiteral);
081            }
082            if (token.equals(JetTokens.MINUSMINUS)) {
083                return new JsBinaryOperation(JsBinaryOperator.SUB, leftExpression, oneLiteral);
084            }
085            throw new AssertionError("This method should be called only for increment and decrement operators");
086        }
087    
088    }