Package aima.core.logic.fol.parsing.ast

Examples of aima.core.logic.fol.parsing.ast.Variable

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  public void testKnows1() {
    Sentence query = parser.parse("Knows(John,x)");
    Sentence johnKnowsJane = parser.parse("Knows(John,Jane)");
    Map<Variable, Term> result = unifier.unify(query, johnKnowsJane, theta);
    Assert.assertEquals(theta, result);
    Assert.assertTrue(theta.keySet().contains(new Variable("x"))); // x =
    Assert.assertEquals(new Constant("Jane"), theta.get(new Variable("x"))); // Jane
  }
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    Sentence johnKnowsJane = parser.parse("Knows(y,Bill)");
    Map<Variable, Term> result = unifier.unify(query, johnKnowsJane, theta);

    Assert.assertEquals(2, result.size());

    Assert.assertEquals(new Constant("Bill"), theta.get(new Variable("x"))); // x
    // =
    // Bill
    Assert.assertEquals(new Constant("John"), theta.get(new Variable("y"))); // y
    // =
    // John
  }
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    Assert.assertEquals(2, result.size());

    List<Term> terms = new ArrayList<Term>();
    terms.add(new Constant("John"));
    Function mother = new Function("Mother", terms);
    Assert.assertEquals(mother, theta.get(new Variable("x")));
    Assert.assertEquals(new Constant("John"), theta.get(new Variable("y")));
  }
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    Sentence johnKnowsJane = parser.parse("Knows(y,z)");
    Map<Variable, Term> result = unifier.unify(query, johnKnowsJane, theta);

    Assert.assertEquals(2, result.size());

    Assert.assertEquals(new Variable("z"), theta.get(new Variable("x"))); // x
    // =
    // z
    Assert.assertEquals(new Constant("John"), theta.get(new Variable("y"))); // y
    // =
    // John
  }
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    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("A"), result.get(new Variable("x")));
  }
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    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("B"), result.get(new Variable("x")));

    s1 = parser.parse("(P(A) OR P(B))");
    s2 = parser.parse("(P(A) OR P(B))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(0, result.size());

    s1 = parser.parse("(P(A) OR P(B))");
    s2 = parser.parse("(P(A) OR P(C))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("(P(A) OR P(B))");
    s2 = parser.parse("(P(A) OR P(x))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("B"), result.get(new Variable("x")));

    s1 = parser.parse("(P(A) => P(B))");
    s2 = parser.parse("(P(A) => P(B))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(0, result.size());

    s1 = parser.parse("(P(A) => P(B))");
    s2 = parser.parse("(P(A) => P(C))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("(P(A) => P(B))");
    s2 = parser.parse("(P(A) => P(x))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("B"), result.get(new Variable("x")));

    s1 = parser.parse("(P(A) <=> P(B))");
    s2 = parser.parse("(P(A) <=> P(B))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(0, result.size());

    s1 = parser.parse("(P(A) <=> P(B))");
    s2 = parser.parse("(P(A) <=> P(C))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("(P(A) <=> P(B))");
    s2 = parser.parse("(P(A) <=> P(x))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("B"), result.get(new Variable("x")));

    s1 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(C))))");
    s2 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(C))))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(0, result.size());

    s1 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(C))))");
    s2 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(A))))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(C))))");
    s2 = parser.parse("((P(A) AND P(B)) OR (P(C) => (P(A) <=> P(x))))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("C"), result.get(new Variable("x")));
  }
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    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("A"), result.get(new Variable("x")));

    //
    s1 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(A) => P(y)))");
    s2 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(A) => P(y)))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(0, result.size());

    s1 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(A) => P(y)))");
    s2 = parser.parse("EXISTS x   ((P(x) AND P(A)) OR (P(A) => P(y)))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(A) => P(y)))");
    s2 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(B) => P(y)))");

    result = unifier.unify(s1, s2);

    Assert.assertNull(result);

    s1 = parser.parse("EXISTS x,y ((P(x) AND P(A)) OR (P(A) => P(y)))");
    s2 = parser.parse("EXISTS x,y ((P(A) AND P(A)) OR (P(A) => P(y)))");

    result = unifier.unify(s1, s2);

    Assert.assertNotNull(result);
    Assert.assertEquals(1, result.size());
    Assert.assertEquals(new Constant("A"), result.get(new Variable("x")));
  }
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    Sentence expectedAfterSubst = parser.parse(" King(John) ");
    Sentence expectedAfterSubstCopy = expectedAfterSubst.copy();

    Assert.assertEquals(expectedAfterSubst, expectedAfterSubstCopy);
    Map<Variable, Term> p = new LinkedHashMap<Variable, Term>();
    p.put(new Variable("x"), new Constant("John"));

    Sentence afterSubst = sv.subst(p, beforeSubst);
    Assert.assertEquals(expectedAfterSubst, afterSubst);
    Assert.assertEquals(beforeSubst, parser.parse("King(x)"));
  }
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  public void testSubstSingleVariableFailsWithPredicate() {
    Sentence beforeSubst = parser.parse("King(x)");
    Sentence expectedAfterSubst = parser.parse(" King(x) ");

    Map<Variable, Term> p = new LinkedHashMap<Variable, Term>();
    p.put(new Variable("y"), new Constant("John"));

    Sentence afterSubst = sv.subst(p, beforeSubst);
    Assert.assertEquals(expectedAfterSubst, afterSubst);
    Assert.assertEquals(beforeSubst, parser.parse("King(x)"));
  }
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  public void testMultipleVariableSubstitutionWithPredicate() {
    Sentence beforeSubst = parser.parse("King(x,y)");
    Sentence expectedAfterSubst = parser.parse(" King(John ,England) ");

    Map<Variable, Term> p = new LinkedHashMap<Variable, Term>();
    p.put(new Variable("x"), new Constant("John"));
    p.put(new Variable("y"), new Constant("England"));

    Sentence afterSubst = sv.subst(p, beforeSubst);
    Assert.assertEquals(expectedAfterSubst, afterSubst);
    Assert.assertEquals(beforeSubst, parser.parse("King(x,y)"));
  }
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Related Classes of aima.core.logic.fol.parsing.ast.Variable

  • aima.core.logic.fol.inference.FOLOTTERLikeTheoremProver
  • aima.core.logic.fol.parsing.FOLParser
  • aima.core.logic.fol.StandardizeApart
  • aima.core.logic.fol.StandardizeQuantiferVariables
  • aima.gui.demo.logic.FolDemo
  • aima.test.core.unit.logic.fol.CommonFOLInferenceProcedureTests
  • aima.test.core.unit.logic.fol.kb.data.ClauseTest
  • aima.test.core.unit.logic.fol.kb.FOLKnowledgeBaseTest
  • aima.test.core.unit.logic.fol.parsing.FOLParserTest
  • aima.test.core.unit.logic.fol.SubstVisitorTest
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