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.psi;
018    
019    import com.google.common.collect.Lists;
020    import com.intellij.lang.ASTNode;
021    import org.jetbrains.annotations.NotNull;
022    import org.jetbrains.annotations.Nullable;
023    import org.jetbrains.kotlin.lexer.JetToken;
024    import org.jetbrains.kotlin.lexer.JetTokens;
025    import org.jetbrains.kotlin.psi.stubs.KotlinPlaceHolderStub;
026    import org.jetbrains.kotlin.psi.stubs.elements.JetStubElementTypes;
027    
028    import java.util.ArrayList;
029    import java.util.Collections;
030    import java.util.List;
031    
032    public class JetFunctionType extends JetElementImplStub<KotlinPlaceHolderStub<JetFunctionType>> implements JetTypeElement {
033    
034        public static final JetToken RETURN_TYPE_SEPARATOR = JetTokens.ARROW;
035    
036        public JetFunctionType(@NotNull ASTNode node) {
037            super(node);
038        }
039    
040        public JetFunctionType(@NotNull KotlinPlaceHolderStub<JetFunctionType> stub) {
041            super(stub, JetStubElementTypes.FUNCTION_TYPE);
042        }
043    
044        @NotNull
045        @Override
046        public List<JetTypeReference> getTypeArgumentsAsTypes() {
047            ArrayList<JetTypeReference> result = Lists.newArrayList();
048            JetTypeReference receiverTypeRef = getReceiverTypeReference();
049            if (receiverTypeRef != null) {
050                result.add(receiverTypeRef);
051            }
052            for (JetParameter jetParameter : getParameters()) {
053                result.add(jetParameter.getTypeReference());
054            }
055            JetTypeReference returnTypeRef = getReturnTypeReference();
056            if (returnTypeRef != null) {
057                result.add(returnTypeRef);
058            }
059            return result;
060        }
061    
062        @Override
063        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
064            return visitor.visitFunctionType(this, data);
065        }
066    
067        @Nullable
068        public JetParameterList getParameterList() {
069            return getStubOrPsiChild(JetStubElementTypes.VALUE_PARAMETER_LIST);
070        }
071    
072        @NotNull
073        public List<JetParameter> getParameters() {
074            JetParameterList list = getParameterList();
075            return list != null ? list.getParameters() : Collections.<JetParameter>emptyList();
076        }
077    
078        @Nullable
079        public JetTypeReference getReceiverTypeReference() {
080            JetFunctionTypeReceiver receiverDeclaration = getStubOrPsiChild(JetStubElementTypes.FUNCTION_TYPE_RECEIVER);
081            if (receiverDeclaration == null) {
082                return null;
083            }
084            return receiverDeclaration.getTypeReference();
085        }
086    
087        @Nullable
088        public JetTypeReference getReturnTypeReference() {
089            return getStubOrPsiChild(JetStubElementTypes.TYPE_REFERENCE);
090        }
091    }