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.intellij.lang.ASTNode;
020 import com.intellij.navigation.ItemPresentation;
021 import com.intellij.navigation.ItemPresentationProviders;
022 import com.intellij.psi.PsiElement;
023 import com.intellij.psi.tree.TokenSet;
024 import org.jetbrains.annotations.NotNull;
025 import org.jetbrains.annotations.Nullable;
026 import org.jetbrains.kotlin.lexer.JetTokens;
027 import org.jetbrains.kotlin.psi.stubs.KotlinParameterStub;
028 import org.jetbrains.kotlin.psi.stubs.elements.JetStubElementTypes;
029 import org.jetbrains.kotlin.psi.typeRefHelpers.TypeRefHelpersPackage;
030
031 import java.util.Collections;
032 import java.util.List;
033
034 public class JetParameter extends JetNamedDeclarationStub<KotlinParameterStub> implements JetCallableDeclaration {
035
036 public JetParameter(@NotNull ASTNode node) {
037 super(node);
038 }
039
040 public JetParameter(@NotNull KotlinParameterStub stub) {
041 super(stub, JetStubElementTypes.VALUE_PARAMETER);
042 }
043
044 @Override
045 public <R, D> R accept(@NotNull JetVisitor<R, D> visitor, D data) {
046 return visitor.visitParameter(this, data);
047 }
048
049 @Override
050 @Nullable
051 public JetTypeReference getTypeReference() {
052 return getStubOrPsiChild(JetStubElementTypes.TYPE_REFERENCE);
053 }
054
055 @Override
056 @Nullable
057 public JetTypeReference setTypeReference(@Nullable JetTypeReference typeRef) {
058 return TypeRefHelpersPackage.setTypeReference(this, getNameIdentifier(), typeRef);
059 }
060
061 @Nullable
062 @Override
063 public PsiElement getColon() {
064 return findChildByType(JetTokens.COLON);
065 }
066
067 public boolean hasDefaultValue() {
068 KotlinParameterStub stub = getStub();
069 if (stub != null) {
070 return stub.hasDefaultValue();
071 }
072 return getDefaultValue() != null;
073 }
074
075 @Nullable
076 public JetExpression getDefaultValue() {
077 KotlinParameterStub stub = getStub();
078 if (stub != null && !stub.hasDefaultValue()) {
079 return null;
080 }
081 boolean passedEQ = false;
082 ASTNode child = getNode().getFirstChildNode();
083 while (child != null) {
084 if (child.getElementType() == JetTokens.EQ) passedEQ = true;
085 if (passedEQ && child.getPsi() instanceof JetExpression) {
086 return (JetExpression) child.getPsi();
087 }
088 child = child.getTreeNext();
089 }
090
091 return null;
092 }
093
094 public boolean isMutable() {
095 KotlinParameterStub stub = getStub();
096 if (stub != null) {
097 return stub.isMutable();
098 }
099
100 return findChildByType(JetTokens.VAR_KEYWORD) != null;
101 }
102
103 public boolean isVarArg() {
104 JetModifierList modifierList = getModifierList();
105 return modifierList != null && modifierList.hasModifier(JetTokens.VARARG_KEYWORD);
106 }
107
108 public boolean hasValOrVar() {
109 KotlinParameterStub stub = getStub();
110 if (stub != null) {
111 return stub.hasValOrVar();
112 }
113 return getValOrVarKeyword() != null;
114 }
115
116 @Nullable
117 public PsiElement getValOrVarKeyword() {
118 KotlinParameterStub stub = getStub();
119 if (stub != null && !stub.hasValOrVar()) {
120 return null;
121 }
122 return findChildByType(VAL_VAR_TOKEN_SET);
123 }
124
125 private static final TokenSet VAL_VAR_TOKEN_SET = TokenSet.create(JetTokens.VAL_KEYWORD, JetTokens.VAR_KEYWORD);
126
127 @Override
128 public ItemPresentation getPresentation() {
129 return ItemPresentationProviders.getItemPresentation(this);
130 }
131
132 public boolean isLoopParameter() {
133 return getParent() instanceof JetForExpression;
134 }
135
136 @Nullable
137 @Override
138 public JetParameterList getValueParameterList() {
139 return null;
140 }
141
142 @NotNull
143 @Override
144 public List<JetParameter> getValueParameters() {
145 return Collections.emptyList();
146 }
147
148 @Nullable
149 @Override
150 public JetTypeReference getReceiverTypeReference() {
151 return null;
152 }
153
154 @Nullable
155 @Override
156 public JetTypeParameterList getTypeParameterList() {
157 return null;
158 }
159
160 @Nullable
161 @Override
162 public JetTypeConstraintList getTypeConstraintList() {
163 return null;
164 }
165
166 @NotNull
167 @Override
168 public List<JetTypeConstraint> getTypeConstraints() {
169 return Collections.emptyList();
170 }
171
172 @NotNull
173 @Override
174 public List<JetTypeParameter> getTypeParameters() {
175 return Collections.emptyList();
176 }
177
178 @Nullable
179 public JetFunction getOwnerFunction() {
180 PsiElement parent = getParent();
181 if (parent == null) return null;
182 PsiElement grandparent = parent.getParent();
183 if (!(grandparent instanceof JetFunction)) return null;
184 return (JetFunction) grandparent;
185 }
186 }