content: /**
   * 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.weex.el.parse;
  
  import com.alibaba.fastjson.JSONArray;
  
  import java.util.List;
  
  /**
   * block, has more than one tokens, but only first will be execute.
   * Created by jianbai.gbj on 2017/8/28.
   */
  class Block extends Token {
      private List<Token> tokens;
      public Block(List<Token> tokens,  int type) {
          super("", type);
          this.tokens = tokens;
      }
  
      @Override
      public Object execute(Object context){
          if(getType() == TYPE_ARRAY){
              if(tokens == null || tokens.size() == 0){
                  return  new JSONArray(4);
              }
              JSONArray arrayList = new JSONArray(tokens.size());
              for(int i=0; i<tokens.size(); i++){
                  Token token = tokens.get(i);
                  if(token == null){
                      arrayList.add(null);
                  }else{
                      arrayList.add(token.execute(context));
                  }
              }
              return arrayList;
          }
          if(tokens == null || tokens.size() == 0){
              return  null;
          }
          Token token = tokens.get(0);
          return token.execute(context);
      }
  
      @Override
      public String toString() {
          if(getType() == TYPE_ARRAY){
              return "" + tokens + "";
          }else {
              if(tokens != null && tokens.size() == 1){
                  return "{" + tokens.get(0) + '}';
              }
              return "{" + tokens + '}';
          }
      }
  }
  