/*
    * Licensed to the Apache Software Foundation (ASF) under one or more
    * contributor license agreements.  See the NOTICE file distributed with
    * this work for additional information regarding copyright ownership.
    * The ASF licenses this file to You under the Apache License, Version 2.0
    * (the "License"); you may not use this file except in compliance with
    * the License.  You may obtain a copy of the License at
    *
    *      http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   */
  package org.apache.commons.jexl3.parser;
  
  import org.apache.commons.jexl3.internal.LexicalScope;
  
  /**
   * Base class for AST nodes behaving as lexical units.
   * @since 3.2
   */
  public abstract class JexlLexicalNode extends JexlNode implements JexlParser.LexicalUnit {
      private static final long serialVersionUID = 1L;
      /** The local lexical scope, local information about let/const. */
      private LexicalScope lexicalScope;
  
      public JexlLexicalNode(final int id) {
          super(id);
      }
  
      @Override
      public boolean declareSymbol(final int symbol) {
          if (lexicalScope == null) {
              lexicalScope = new LexicalScope();
          }
          return lexicalScope.addSymbol(symbol);
      }
  
      @Override
      public LexicalScope getLexicalScope() {
          return lexicalScope;
      }
  
      @Override
      public int getSymbolCount() {
          return lexicalScope == null ? 0 : lexicalScope.getSymbolCount();
      }
  
      @Override
      public boolean hasSymbol(final int symbol) {
          return lexicalScope != null && lexicalScope.hasSymbol(symbol);
      }
  
      @Override
      public boolean isConstant(final int symbol) {
          return lexicalScope != null && lexicalScope.isConstant(symbol);
      }
  
      @Override
      public void jjtClose() {
  
      }
  
      @Override
      public void setConstant(final int symbol) {
          lexicalScope.addConstant(symbol);
      }
  }