content: /*
   * Copyright 2021-2022 Alibaba Group Holding Ltd.
   *
   *    Licensed 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 com.aliyun.fastmodel.core.formatter;
  
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import com.aliyun.fastmodel.core.tree.datatype.GenericDataType;
  import com.aliyun.fastmodel.core.tree.expr.Identifier;
  import org.junit.Test;
  
  import static org.junit.Assert.assertEquals;
  import static org.junit.Assert.assertFalse;
  import static org.junit.Assert.assertTrue;
  
  /**
   * Desc:
   *
   * @author panguanjing
   * @date 2021/7/23
   */
  public class ExpressionVisitorTest {
  
      @Test
      public void testFormatString() {
          ExpressionVisitor expressionVisitor = new ExpressionVisitor();
          String s = expressionVisitor.formatStringLiteral(null);
          assertEquals(s, "''");
      }
  
      @Test
      public void testCustom() {
          ExpressionVisitor expressionVisitor = new ExpressionVisitor();
          GenericDataType g = new GenericDataType("VARCHAR2");
          String result = expressionVisitor.visitGenericDataType(g, null);
          assertEquals(result, "VARCHAR2");
      }
  
      @Test
      public void testIdentifier() {
          Pattern pattern = Pattern.compile("[0-9]*");
          Matcher matcher = pattern.matcher("1");
          assertTrue(matcher.matches());
          matcher = pattern.matcher("1a");
          assertFalse(matcher.matches());
      }
  
      @Test
      public void testDigit() {
          Identifier identifier = new Identifier("1");
          assertTrue(identifier.isDelimited());
      }
  }