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
017package org.jetbrains.jet.lang.psi;
018
019import com.intellij.lang.ASTNode;
020import com.intellij.navigation.ItemPresentation;
021import com.intellij.navigation.ItemPresentationProviders;
022import com.intellij.psi.stubs.IStubElementType;
023import com.intellij.util.ArrayFactory;
024import org.jetbrains.annotations.NotNull;
025import org.jetbrains.annotations.Nullable;
026import org.jetbrains.jet.JetNodeTypes;
027import org.jetbrains.jet.lang.psi.stubs.PsiJetParameterStub;
028import org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes;
029import org.jetbrains.jet.lexer.JetTokens;
030
031public 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}