Examples with Variable kodkod.ast.Variable used on opensource projects

Example 36 with Variable

use of kodkod.ast.Variable in project org.alloytools.alloy by AlloyTools.

the class LAT258 method loLeDistr.

/**
 * Returns the lo_le_distr axiom.
 *
 * @return the lo_le_distr axiom.
 */
public final Formula loLeDistr() {
    final Variable a = Variable.unary("A"), b = Variable.unary("B"), c = Variable.unary("C");
    final Expression h = c.join(b.join(join));
    final Expression d = h.join(a.join(meet));
    final Expression e = b.join(a.join(meet));
    final Expression f = c.join(a.join(meet));
    final Expression g = f.join(e.join(join));
    final Formula f0 = d.product(g).in(lessThan);
    // (c.(a.meet)).((b.(a.meet)).join) in lessThan
    return f0.forAll(a.oneOf(UNIV).and(b.oneOf(UNIV)).and(c.oneOf(UNIV)));
}

Example 37 with Variable

use of kodkod.ast.Variable in project org.alloytools.alloy by AlloyTools.

the class CeilingsAndFloors method noSharing.

/**
 * Returns the noSharing constraint.
 *
 * @return all m, n: Man | !(m = n) => !(m.floor = n.floor || m.ceiling =
 *         n.ceiling)
 */
public Formula noSharing() {
    final Variable m = Variable.unary("m1"), n = Variable.unary("n1");
    // all m, n: Man | !(m = n) => !(m.floor = n.floor || m.ceiling =
    // n.ceiling)
    final Formula body = (m.join(floor).eq(n.join(floor))).or(m.join(ceiling).eq(n.join(ceiling)));
    return (m.eq(n).not().implies(body.not())).forAll(m.oneOf(Man).and(n.oneOf(Man)));
}

Example 38 with Variable

use of kodkod.ast.Variable in project org.alloytools.alloy by AlloyTools.

the class Hotel method freshIssue.

/**
 * Returns FreshIssue fact.
 *
 * @return FressIssue fact.
 */
public Formula freshIssue() {
    // -- don't issue same key twice
    // all disj e1, e2: Checkin | e1.card.k2 != e2.card.k2
    // -- don't issue key initially installed in lock
    // all e: Checkin | e.card.k2 !in Room.key.first
    final List<Formula> invs = new ArrayList<Formula>();
    final Variable e1 = Variable.unary("e1");
    final Variable e2 = Variable.unary("e2");
    final Variable e = Variable.unary("e");
    invs.add(e1.eq(e2).not().implies(e1.join(card).join(k2).eq(e2.join(card).join(k2)).not()).forAll(e1.oneOf(Checkin).and(e2.oneOf(Checkin))));
    invs.add(e.join(card).join(k2).in(Room.join(key).join(first)).not().forAll(e.oneOf(Checkin)));
    return Formula.and(invs);
}

Example 39 with Variable

use of kodkod.ast.Variable in project org.alloytools.alloy by AlloyTools.

the class Hotel method noIntervening.

/**
 * Returns the noIntervening fact.
 *
 * @return noIntervening fact.
 */
public Formula noIntervening() {
    // fact NoIntervening {
    // all c: Checkin - pre.last |
    // some e: Enter | e.pre = c.post and e.room = c.room and e.guest =
    // c.guest
    // }
    final Variable c = Variable.unary("c");
    final Variable e = Variable.unary("e");
    final Formula f = e.join(pre).eq(c.join(post)).and(e.join(room).eq(c.join(room))).and(e.join(guest).eq(c.join(guest)));
    return f.forSome(e.oneOf(Enter)).forAll(c.oneOf(Checkin.difference(pre.join(last))));
}

Example 40 with Variable

use of kodkod.ast.Variable in project org.alloytools.alloy by AlloyTools.

the class Hotel method recodeEnterInvariants.

/**
 * Returns the invariants for RecodeEnter and its fields.
 *
 * @return invariants for RecodeEnter and its fields.
 */
public Formula recodeEnterInvariants() {
    // sig RecodeEnter extends Enter { }
    // {
    // card.k1 = room.key.pre
    // key.post = key.pre ++ room -> card.k2
    // 
    // prev.unchanged
    // holds.unchanged
    // occ.unchanged
    // }
    final List<Formula> invs = new ArrayList<Formula>();
    invs.add(RecodeEnter.in(Enter));
    final Variable r = Variable.unary("n");
    invs.add(card(r).join(k1).eq(room(r).join(key).join(pre(r))).forAll(r.oneOf(RecodeEnter)));
    invs.add(key.join(post(r)).eq(key.join(pre(r)).override(room(r).product(card(r).join(k2)))).forAll(r.oneOf(RecodeEnter)));
    invs.add(unchanged(r, prev).forAll(r.oneOf(RecodeEnter)));
    invs.add(unchanged(r, holds).forAll(r.oneOf(RecodeEnter)));
    invs.add(unchanged(r, occ).forAll(r.oneOf(RecodeEnter)));
    return Formula.and(invs);
}