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.intrinsic.operation;
018    
019    import com.google.dart.compiler.backend.js.ast.JsBinaryOperation;
020    import com.google.dart.compiler.backend.js.ast.JsBinaryOperator;
021    import com.google.dart.compiler.backend.js.ast.JsExpression;
022    import org.jetbrains.annotations.NotNull;
023    import org.jetbrains.jet.lang.descriptors.FunctionDescriptor;
024    import org.jetbrains.jet.lang.psi.JetBinaryExpression;
025    import org.jetbrains.jet.lang.types.expressions.OperatorConventions;
026    import org.jetbrains.k2js.translate.context.TranslationContext;
027    import org.jetbrains.k2js.translate.operation.OperatorTable;
028    import org.jetbrains.k2js.translate.utils.JsDescriptorUtils;
029    
030    import static org.jetbrains.k2js.translate.utils.BindingUtils.getFunctionDescriptorForOperationExpression;
031    import static org.jetbrains.k2js.translate.utils.PsiUtils.getOperationToken;
032    
033    public final class CompareToInstrinsic implements BinaryOperationIntrinsic {
034        @Override
035        public boolean isApplicable(@NotNull JetBinaryExpression expression, @NotNull TranslationContext context) {
036            if (!OperatorConventions.COMPARISON_OPERATIONS.contains(getOperationToken(expression))) {
037                return false;
038            }
039            FunctionDescriptor functionDescriptor = getFunctionDescriptorForOperationExpression(context.bindingContext(), expression);
040            assert functionDescriptor != null;
041            return JsDescriptorUtils.isStandardDeclaration(functionDescriptor);
042        }
043    
044        @NotNull
045        @Override
046        public JsExpression apply(@NotNull JetBinaryExpression expression,
047                @NotNull JsExpression left,
048                @NotNull JsExpression right,
049                @NotNull TranslationContext context) {
050            JsBinaryOperator operator = OperatorTable.getBinaryOperator(getOperationToken(expression));
051            return new JsBinaryOperation(operator, left, right);
052        }
053    }