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 org.jetbrains.annotations.NotNull;
023 import org.jetbrains.annotations.Nullable;
024 import org.jetbrains.jet.lang.psi.stubs.PsiJetParameterStub;
025 import org.jetbrains.jet.lang.psi.stubs.elements.JetStubElementTypes;
026 import org.jetbrains.jet.lexer.JetTokens;
027
028 public class JetParameter extends JetNamedDeclarationStub<PsiJetParameterStub> {
029
030 public JetParameter(@NotNull ASTNode node) {
031 super(node);
032 }
033
034 public JetParameter(@NotNull PsiJetParameterStub stub) {
035 super(stub, JetStubElementTypes.VALUE_PARAMETER);
036 }
037
038 @Override
039 public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
040 return visitor.visitParameter(this, data);
041 }
042
043 @Nullable
044 public JetTypeReference getTypeReference() {
045 return getStubOrPsiChild(JetStubElementTypes.TYPE_REFERENCE);
046 }
047
048 public boolean hasDefaultValue() {
049 PsiJetParameterStub stub = getStub();
050 if (stub != null) {
051 return stub.hasDefaultValue();
052 }
053 return getDefaultValue() != null;
054 }
055
056 @Nullable
057 public JetExpression getDefaultValue() {
058 PsiJetParameterStub stub = getStub();
059 if (stub != null && !stub.hasDefaultValue()) {
060 return null;
061 }
062 boolean passedEQ = false;
063 ASTNode child = getNode().getFirstChildNode();
064 while (child != null) {
065 if (child.getElementType() == JetTokens.EQ) passedEQ = true;
066 if (passedEQ && child.getPsi() instanceof JetExpression) {
067 return (JetExpression) child.getPsi();
068 }
069 child = child.getTreeNext();
070 }
071
072 return null;
073 }
074
075 public boolean isMutable() {
076 PsiJetParameterStub stub = getStub();
077 if (stub != null) {
078 return stub.isMutable();
079 }
080
081 return findChildByType(JetTokens.VAR_KEYWORD) != null;
082 }
083
084 public boolean isVarArg() {
085 JetModifierList modifierList = getModifierList();
086 return modifierList != null && modifierList.hasModifier(JetTokens.VARARG_KEYWORD);
087 }
088
089 public boolean hasValOrVarNode() {
090 PsiJetParameterStub stub = getStub();
091 if (stub != null) {
092 return stub.hasValOrValNode();
093 }
094 return getValOrVarNode() != null;
095 }
096
097 @Nullable
098 public ASTNode getValOrVarNode() {
099 PsiJetParameterStub stub = getStub();
100 if (stub != null && !stub.hasValOrValNode()) {
101 return null;
102 }
103 ASTNode val = getNode().findChildByType(JetTokens.VAL_KEYWORD);
104 if (val != null) return val;
105
106 return getNode().findChildByType(JetTokens.VAR_KEYWORD);
107 }
108
109 @Override
110 public ItemPresentation getPresentation() {
111 return ItemPresentationProviders.getItemPresentation(this);
112 }
113
114 public boolean isLoopParameter() {
115 return getParent() instanceof JetForExpression;
116 }
117 }