Examples with AndOp uk.me.parabola.mkgmap.osmstyle.eval.AndOp used on opensource projects

Example 1 with AndOp

use of uk.me.parabola.mkgmap.osmstyle.eval.AndOp in project mkgmap by openstreetmap.

the class ExpressionArranger method distribute.

/**
 * Create a new OR expression from OR and an other expression.
 *
 * Starting point is a node of the form (a|b|...) & c
 *
 * The output is (a & c) | (b & c) | ...
 */
private Op distribute(Op op) {
    Op ab = op.getFirst();
    Op a = ab.getFirst();
    Op b = ab.getSecond();
    Op c = op.getSecond();
    assert a != b : "ab";
    assert b != c : "bc";
    // Collect the OR terms into a list
    List<Op> orterms = new ArrayList<>();
    while (b.isType(OR)) {
        orterms.add(b.getFirst());
        b = b.getSecond();
    }
    OrOp topOR = new OrOp();
    topOR.setFirst(new AndOp().set(a, c));
    OrOp current = topOR;
    for (Op orterm : orterms) {
        AndOp and = new AndOp().set(orterm, c.copy());
        OrOp newOr = new OrOp().set(and, null);
        current.setSecond(newOr);
        current = newOr;
    }
    current.setSecond(new AndOp().set(b, c.copy()));
    return topOR;
}