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.jet.lang.psi;
018    
019    import com.intellij.lang.ASTNode;
020    import com.intellij.navigation.ItemPresentation;
021    import com.intellij.navigation.ItemPresentationProviders;
022    import com.intellij.psi.stubs.IStubElementType;
023    import com.intellij.util.ArrayFactory;
024    import org.jetbrains.annotations.NotNull;
025    import org.jetbrains.annotations.Nullable;
026    import org.jetbrains.jet.JetNodeTypes;
027    import org.jetbrains.jet.lang.psi.stubs.PsiJetParameterStub;
028    import org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes;
029    import org.jetbrains.jet.lexer.JetTokens;
030    
031    public class JetParameter extends JetNamedDeclarationStub<PsiJetParameterStub> {
032        public static final JetParameter[] EMPTY_ARRAY = new JetParameter[0];
033    
034        public static final ArrayFactory<JetParameter> ARRAY_FACTORY = new ArrayFactory<JetParameter>() {
035            @Override
036            public JetParameter[] create(int count) {
037                return count == 0 ? EMPTY_ARRAY : new JetParameter[count];
038            }
039        };
040    
041        public JetParameter(@NotNull ASTNode node) {
042            super(node);
043        }
044    
045        public JetParameter(@NotNull PsiJetParameterStub stub, @NotNull IStubElementType nodeType) {
046            super(stub, nodeType);
047        }
048    
049        @NotNull
050        @Override
051        public IStubElementType getElementType() {
052            return JetStubElementTypes.VALUE_PARAMETER;
053        }
054    
055        @Override
056        public void accept(@NotNull JetVisitorVoid visitor) {
057            visitor.visitParameter(this);
058        }
059    
060        @Override
061        public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
062            return visitor.visitParameter(this, data);
063        }
064    
065        @Nullable
066        public JetTypeReference getTypeReference() {
067            return (JetTypeReference) findChildByType(JetNodeTypes.TYPE_REFERENCE);
068        }
069    
070        @Nullable
071        public JetExpression getDefaultValue() {
072            boolean passedEQ = false;
073            ASTNode child = getNode().getFirstChildNode();
074            while (child != null) {
075                if (child.getElementType() == JetTokens.EQ) passedEQ = true;
076                if (passedEQ && child.getPsi() instanceof JetExpression) {
077                    return (JetExpression) child.getPsi();
078                }
079                child = child.getTreeNext();
080            }
081    
082            return null;
083        }
084    
085        public boolean isMutable() {
086            PsiJetParameterStub stub = getStub();
087            if (stub != null) {
088                return stub.isMutable();
089            }
090    
091            return findChildByType(JetTokens.VAR_KEYWORD) != null;
092        }
093    
094        public boolean isVarArg() {
095            PsiJetParameterStub stub = getStub();
096            if (stub != null) {
097                return stub.isVarArg();
098            }
099    
100            JetModifierList modifierList = getModifierList();
101            return modifierList != null && modifierList.getModifierNode(JetTokens.VARARG_KEYWORD) != null;
102        }
103    
104        @Nullable
105        public ASTNode getValOrVarNode() {
106            ASTNode val = getNode().findChildByType(JetTokens.VAL_KEYWORD);
107            if (val != null) return val;
108    
109            return getNode().findChildByType(JetTokens.VAR_KEYWORD);
110        }
111    
112        @Override
113        public ItemPresentation getPresentation() {
114            return ItemPresentationProviders.getItemPresentation(this);
115        }
116    }