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.intrinsic.functions.basic;
018    
019    import com.google.dart.compiler.backend.js.ast.JsExpression;
020    import org.jetbrains.annotations.NotNull;
021    import org.jetbrains.annotations.Nullable;
022    import org.jetbrains.kotlin.js.translate.callTranslator.CallInfo;
023    import org.jetbrains.kotlin.js.translate.context.TranslationContext;
024    
025    import java.util.List;
026    
027    /**
028     * Base for intrinsics that substitute standard function calls like Int#plus, Float#minus ... etc
029     */
030    public abstract class FunctionIntrinsic {
031    
032        @NotNull
033        public static final FunctionIntrinsic NO_INTRINSIC = new FunctionIntrinsic() {
034            @Override
035            public boolean exists() {
036                return false;
037            }
038    
039            @NotNull
040            @Override
041            public JsExpression apply(@Nullable JsExpression receiver,
042                    @NotNull List<JsExpression> arguments,
043                    @NotNull TranslationContext context) {
044                throw new UnsupportedOperationException("FunctionIntrinsic#NO_INTRINSIC_#apply");
045            }
046        };
047    
048        @Nullable
049        protected static JsExpression getThisOrReceiverOrNull(@NotNull CallInfo callInfo) {
050            if (callInfo.getDispatchReceiver() != null) {
051                return callInfo.getDispatchReceiver();
052            } else {
053                return callInfo.getExtensionReceiver();
054            }
055        }
056    
057        @NotNull
058        public JsExpression apply(@NotNull CallInfo callInfo,
059                @NotNull List<JsExpression> arguments,
060                @NotNull TranslationContext context) {
061            return apply(getThisOrReceiverOrNull(callInfo), arguments, context);
062        }
063    
064        @NotNull
065        public abstract JsExpression apply(@Nullable JsExpression receiver,
066                @NotNull List<JsExpression> arguments,
067                @NotNull TranslationContext context
068        );
069    
070        public boolean exists() {
071            return true;
072        }
073    
074        public abstract static class CallParametersAwareFunctionIntrinsic extends FunctionIntrinsic {
075            @NotNull
076            @Override
077            public JsExpression apply(@Nullable JsExpression receiver,
078                    @NotNull List<JsExpression> arguments,
079                    @NotNull TranslationContext context
080            ) {
081                throw new IllegalStateException();
082            }
083        }
084    }