Examples with Rewriter com.sri.ai.grinder.sgdpllt.rewriter.api.Rewriter used on opensource projects

Example 16 with Rewriter

use of com.sri.ai.grinder.sgdpllt.rewriter.api.Rewriter in project aic-expresso by aic-sri-international.

the class FirstOfTest method testSimpleFirstOfConditionalRewriter.

@Test
public void testSimpleFirstOfConditionalRewriter() {
    class JumperAtStepSolver implements ExpressionLiteralSplitterStepSolver {

        private Expression expression;

        private int jumpPoint;

        public JumperAtStepSolver(Expression expression, int jumpPoint) {
            this.expression = expression;
            this.jumpPoint = jumpPoint;
        }

        @Override
        public JumperAtStepSolver clone() {
            JumperAtStepSolver result = null;
            try {
                result = (JumperAtStepSolver) super.clone();
            } catch (CloneNotSupportedException e) {
                e.printStackTrace();
            }
            return result;
        }

        @Override
        public Step step(Context context) {
            if (Expressions.isNumber(expression) && expression.intValue() % 10 != 0) {
                if (expression.intValue() == jumpPoint) {
                    Expression literal = parse("Jump5");
                    ContextSplitting splitting = new ContextSplitting(literal, context);
                    switch(splitting.getResult()) {
                        case LITERAL_IS_TRUE:
                            return new Solution(DefaultSymbol.createSymbol(jumpPoint + 5));
                        case LITERAL_IS_FALSE:
                            return new Solution(DefaultSymbol.createSymbol(jumpPoint + 1));
                        case LITERAL_IS_UNDEFINED:
                            return new ItDependsOn(literal, splitting, this, this);
                        default:
                            throw new Error("Unpredicted case");
                    }
                } else {
                    return new Solution(expression);
                }
            } else
                return new Solution(expression);
        }
    }
    ;
    List<Rewriter> rewriters = Util.<Rewriter>list((Expression e) -> new JumperAtStepSolver(e, 5), (Expression e) -> new JumperAtStepSolver(e, 8));
    Expression initial;
    Expression expected;
    initial = parse("1");
    // no jumps at 1
    expected = parse("1");
    runTest(rewriters, initial, expected, map(parse("Jump5"), parse("Boolean")));
    initial = parse("5");
    expected = parse("if Jump5 then 10 else 6");
    runTest(rewriters, initial, expected, map(parse("Jump5"), parse("Boolean")));
    initial = parse("8");
    expected = parse("if Jump5 then 13 else 9");
    runTest(rewriters, initial, expected, map(parse("Jump5"), parse("Boolean")));
}