Examples with ExternalLiteral at.ac.tuwien.kr.alpha.api.programs.literals.ExternalLiteral used on opensource projects

Example 1 with ExternalLiteral

use of at.ac.tuwien.kr.alpha.api.programs.literals.ExternalLiteral in project Alpha by alpha-asp.

the class ArithmeticTermsRewritingTest method rewriteExternalAtom.

@Test
public void rewriteExternalAtom() {
    NormalProgram inputProgram = NormalProgramImpl.fromInputProgram(parser.parse("p :- Y = 13, &extArithTest[Y*5](Y-4)."));
    assertEquals(1, inputProgram.getRules().size());
    ArithmeticTermsRewriting arithmeticTermsRewriting = new ArithmeticTermsRewriting();
    NormalProgram rewrittenProgram = arithmeticTermsRewriting.apply(inputProgram);
    assertEquals(1, rewrittenProgram.getRules().size());
    NormalRule rewrittenRule = rewrittenProgram.getRules().get(0);
    assertEquals(4, rewrittenRule.getBody().size());
    List<Literal> externalLiterals = rewrittenRule.getBody().stream().filter(lit -> lit instanceof ExternalLiteral).collect(toList());
    assertEquals(1, externalLiterals.size());
    ExternalAtom rewrittenExternal = ((ExternalLiteral) externalLiterals.get(0)).getAtom();
    assertEquals(1, rewrittenExternal.getInput().size());
    assertTrue(rewrittenExternal.getInput().get(0) instanceof VariableTerm);
    assertEquals(1, rewrittenExternal.getOutput().size());
    assertTrue(rewrittenExternal.getOutput().get(0) instanceof VariableTerm);
}