content: /**
   * Copyright (c) 2017-2018 Siemens AG
   * All rights reserved.
   * 
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are met:
   * 
   * 1) Redistributions of source code must retain the above copyright notice, this
   *    list of conditions and the following disclaimer.
   * 
   * 2) Redistributions in binary form must reproduce the above copyright notice,
   *    this list of conditions and the following disclaimer in the documentation
   *    and/or other materials provided with the distribution.
   * 
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
   * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
   * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
   * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
   * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
   * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  package at.ac.tuwien.kr.alpha.core.grounder;
  
  import static org.junit.jupiter.api.Assertions.assertEquals;
  
  import java.util.List;
  
  import org.junit.jupiter.api.Test;
  
  import at.ac.tuwien.kr.alpha.api.programs.ASPCore2Program;
  import at.ac.tuwien.kr.alpha.api.programs.ProgramParser;
  import at.ac.tuwien.kr.alpha.api.programs.rules.Rule;
  import at.ac.tuwien.kr.alpha.api.programs.rules.heads.Head;
  import at.ac.tuwien.kr.alpha.commons.programs.rules.Rules;
  import at.ac.tuwien.kr.alpha.core.parser.ProgramParserImpl;
  import at.ac.tuwien.kr.alpha.core.programs.rules.CompiledRule;
  import at.ac.tuwien.kr.alpha.core.programs.rules.InternalRule;
  
  /**
   * Tests {@link BasicRule#toString()} and {@link InternalRule#toString()}.
   */
  public class RuleToStringTest {
  	private final ProgramParser parser = new ProgramParserImpl();
  	
  	@Test
  	public void positiveRuleToString() {
  		parseSingleRuleAndCheckToString("a :- b1, b2.");
  	}
  	
  	@Test
  	public void ruleWithNegativeBodyToString() {
  		parseSingleRuleAndCheckToString("a :- b1, b2.");
  	}
  
  	@Test
  	public void normalRuleToString() {
  		parseSingleRuleAndCheckToString("a :- b1, b2, not c1, not c2.");
  	}
  
  	@Test
  	public void constraintToString() {
  		parseSingleRuleAndCheckToString(":- b1, b2, not c1, not c2.");
  	}
  	
  	@Test
  	public void nonGroundPositiveRuleToString() {
  		constructNonGroundRuleAndCheckToString("a :- b1, b2.");
  	}
  	
  	@Test
  	public void nonGroundRuleWithNegativeBodyToString() {
  		constructNonGroundRuleAndCheckToString("a :- b1, b2.");
  	}
  
  	@Test
  	public void nonGroundRuleToString() {
  		constructNonGroundRuleAndCheckToString("a(X) :- b1(X), b2(X), not c1(X), not c2(X).");
  	}
  
  	@Test
  	public void nonGroundConstraintToString() {
  		constructNonGroundRuleAndCheckToString(":- b1(X), b2(X), not c1(X), not c2(X).");
  	}
  
  	private void parseSingleRuleAndCheckToString(String rule) {
  		Rule<Head> parsedRule = parseSingleRule(rule);
  		assertEquals(rule, parsedRule.toString());
  	}
  
  	private void constructNonGroundRuleAndCheckToString(String textualRule) {
  		CompiledRule nonGroundRule = InternalRule.fromNormalRule(Rules.toNormalRule(parseSingleRule(textualRule)));
  		assertEquals(textualRule, nonGroundRule.toString());
  	}
  
  	private Rule<Head> parseSingleRule(String rule) {
  		ASPCore2Program program = parser.parse(rule);
  		List<Rule<Head>> rules = program.getRules();
  		assertEquals(1, rules.size(), "Number of rules");
  		return rules.get(0);
  	}
  }
  