code: /*
   * 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.skywalking.promql.rt.parser;
  
  import java.util.Arrays;
  import java.util.Collection;
  import org.antlr.v4.runtime.CharStreams;
  import org.antlr.v4.runtime.CommonTokenStream;
  import org.antlr.v4.runtime.tree.ParseTree;
  import org.apache.skywalking.oap.query.promql.rt.PromQLMatchVisitor;
  import org.apache.skywalking.oap.query.promql.rt.result.MatcherSetResult;
  import org.apache.skywalking.oap.query.promql.rt.result.ParseResultType;
  import org.apache.skywalking.promql.rt.grammar.PromQLLexer;
  import org.apache.skywalking.promql.rt.grammar.PromQLParser;
  import org.junit.jupiter.api.Assertions;
  import org.junit.jupiter.params.ParameterizedTest;
  import org.junit.jupiter.params.provider.MethodSource;
  
  public class PromQLMatchVisitorTest {
  
      public static Collection<Object[]> data() {
          return Arrays.asList(new Object[][] {
              {
                  "service_cpm",
                  ParseResultType.MATCH,
                  "service_cpm",
                  0
              },
              {
                  "service_cpm{}",
                  ParseResultType.MATCH,
                  "service_cpm",
                  0
              },
              {
                  "service_cpm{service='serviceA', layer='GENERAL'}",
                  ParseResultType.MATCH,
                  "service_cpm",
                  2
              }
          });
      }
  
      @ParameterizedTest
      @MethodSource("data")
      public void testMatchVisitor(
          String expression,
          ParseResultType wantType,
          String metricName,
          int labelsSize) {
          PromQLLexer lexer = new PromQLLexer(CharStreams.fromString(expression));
          CommonTokenStream tokens = new CommonTokenStream(lexer);
          PromQLParser parser = new PromQLParser(tokens);
          ParseTree tree = parser.expression();
          PromQLMatchVisitor visitor = new PromQLMatchVisitor();
          MatcherSetResult parseResult = visitor.visit(tree);
          Assertions.assertEquals(wantType, parseResult.getResultType());
          Assertions.assertEquals(metricName, parseResult.getMetricName());
          Assertions.assertEquals(labelsSize, parseResult.getLabelMap().size());
      }
  }
  