Examples with ItDependsOn com.sri.ai.grinder.api.ExpressionLiteralSplitterStepSolver.ItDependsOn used on opensource projects

Example 1 with ItDependsOn

use of com.sri.ai.grinder.api.ExpressionLiteralSplitterStepSolver.ItDependsOn in project aic-expresso by aic-sri-international.

the class RecursiveTest method testConditionalRecursiveRewriter.

@Test
public void testConditionalRecursiveRewriter() {
    Expression xIs0 = parse("XIs0");
    RewriterFromStepMaker rewriter = (Expression e, Context c) -> {
        if (Expressions.isNumber(e)) {
            return new Solution(DefaultSymbol.createSymbol(e.intValue() + 1));
        } else if (e.equals(parse("X"))) {
            ContextSplitting splitting = new ContextSplitting(xIs0, c);
            switch(splitting.getResult()) {
                case LITERAL_IS_TRUE:
                    return new Solution(ZERO);
                case LITERAL_IS_FALSE:
                    return new Solution(ONE);
                case LITERAL_IS_UNDEFINED:
                    return new ItDependsOn(xIs0, splitting, new ConstantExpressionStepSolver(ZERO), new ConstantExpressionStepSolver(ONE));
                default:
                    throw new Error("Unpredicted case.");
            }
        }
        return new Solution(e);
    };
    Expression initial;
    Expression expected;
    initial = parse("X");
    expected = parse("if " + xIs0 + " then 0 else 1");
    runTest(rewriter, initial, expected, map(xIs0, parse("Boolean")));
    initial = parse("f(9,g(X,7,6))");
    expected = parse("if " + xIs0 + " then f(10,g(0,8,7)) else f(10,g(1,8,7))");
    runTest(rewriter, initial, expected, map(xIs0, parse("Boolean")));
    initial = parse("X(9,g(h(1,2,X),X,7,6))");
    expected = parse("if " + xIs0 + " then 0(10,g(h(2,3,0),0,8,7)) else 1(10,g(h(2,3,1),1,8,7))");
    runTest(rewriter, initial, expected, map(xIs0, parse("Boolean")));
}

Example 2 with ItDependsOn

use of com.sri.ai.grinder.api.ExpressionLiteralSplitterStepSolver.ItDependsOn in project aic-expresso by aic-sri-international.

the class ExpressionConditionedOnLiteralSolutionStep method stepDependingOnLiteral.

/**
 * Produces a solver step based on value of literal, with corresponding given solutions
 * (if literal is not defined by context, a {@link ItDependsOn} step is returned).
 * @param literal
 * @param solutionIfTrue
 * @param solutionIfFalse
 * @param context
 * @return
 */
public static Step stepDependingOnLiteral(Expression literal, Expression solutionIfTrue, Expression solutionIfFalse, Context context) {
    Step result;
    LiteralStepSolver literalStepSolver = new LiteralStepSolver(literal);
    StepSolver.Step<Boolean> step = literalStepSolver.step(context);
    if (step.itDepends()) {
        result = new ItDependsOn(step.getSplitter(), step.getContextSplittingWhenSplitterIsLiteral(), constantExpressionStepSolver(solutionIfTrue), constantExpressionStepSolver(solutionIfFalse));
    } else {
        result = new Solution(step.getValue() ? solutionIfTrue : solutionIfFalse);
    }
    return result;
}