001    // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
002    // for details. All rights reserved. Use of this source code is governed by a
003    // BSD-style license that can be found in the LICENSE file.
004    
005    package org.jetbrains.kotlin.js.backend.ast;
006    
007    import org.jetbrains.kotlin.js.common.Symbol;
008    import org.jetbrains.kotlin.js.util.AstUtil;
009    import org.jetbrains.annotations.NotNull;
010    import org.jetbrains.annotations.Nullable;
011    
012    /**
013     * Represents a JavaScript expression that references a name.
014     */
015    public final class JsNameRef extends JsExpression implements HasName {
016        private String ident;
017        private JsName name;
018        private JsExpression qualifier;
019    
020        public JsNameRef(@NotNull JsName name) {
021            this.name = name;
022        }
023    
024        public JsNameRef(@NotNull String ident) {
025            this.ident = ident;
026        }
027    
028        public JsNameRef(@NotNull String ident, JsExpression qualifier) {
029            this.ident = ident;
030            this.qualifier = qualifier;
031        }
032    
033        public JsNameRef(@NotNull String ident, @NotNull String qualifier) {
034            this(ident, new JsNameRef(qualifier));
035        }
036    
037        public JsNameRef(@NotNull JsName name, JsExpression qualifier) {
038            this.name = name;
039            this.qualifier = qualifier;
040        }
041    
042        @NotNull
043        public String getIdent() {
044            return (name == null) ? ident : name.getIdent();
045        }
046    
047        @Nullable
048        @Override
049        public JsName getName() {
050            return name;
051        }
052    
053        @Override
054        public void setName(JsName name) {
055            this.name = name;
056        }
057    
058        @Nullable
059        @Override
060        public Symbol getSymbol() {
061            return name;
062        }
063    
064        @Nullable
065        public JsExpression getQualifier() {
066            return qualifier;
067        }
068    
069        @Override
070        public boolean isLeaf() {
071            return qualifier == null;
072        }
073    
074        public void resolve(JsName name) {
075            this.name = name;
076            ident = null;
077        }
078    
079        public void setQualifier(JsExpression qualifier) {
080            this.qualifier = qualifier;
081        }
082    
083        @Override
084        public void accept(JsVisitor v) {
085            v.visitNameRef(this);
086        }
087    
088        @Override
089        public void acceptChildren(JsVisitor visitor) {
090            if (qualifier != null) {
091               visitor.accept(qualifier);
092            }
093        }
094    
095        @Override
096        public void traverse(JsVisitorWithContext v, JsContext ctx) {
097            if (v.visit(this, ctx)) {
098                if (qualifier != null) {
099                    qualifier = v.accept(qualifier);
100                }
101            }
102            v.endVisit(this, ctx);
103        }
104    
105        @NotNull
106        @Override
107        public JsNameRef deepCopy() {
108            JsExpression qualifierCopy = AstUtil.deepCopy(qualifier);
109    
110            if (name != null) return new JsNameRef(name, qualifierCopy).withMetadataFrom(this);
111    
112            return new JsNameRef(ident, qualifierCopy).withMetadataFrom(this);
113        }
114    }