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package ninja.soroosh.hashem.lang.nodes.expression;

import com.oracle.truffle.api.CompilerDirectives.TruffleBoundary;
import com.oracle.truffle.api.dsl.Fallback;
import com.oracle.truffle.api.dsl.Specialization;
import com.oracle.truffle.api.nodes.NodeInfo;
import ninja.soroosh.hashem.lang.HashemException;
import ninja.soroosh.hashem.lang.nodes.HashemBinaryNode;
import ninja.soroosh.hashem.lang.runtime.HashemBigNumber;

/**
 * This class is similar to the extensively documented {@link HashemAddNode}. The only difference: the
 * specialized methods return {@code boolean} instead of the input types.
 */
@NodeInfo(shortName = "<")
public abstract class HashemLessThanNode extends HashemBinaryNode {

    @Specialization
    protected boolean lessThan(long left, long right) {
        return left < right;
    }

    @Specialization
    protected boolean lessThan(float left, float right) {
        return left < right;
    }

    @Specialization
    @TruffleBoundary
    protected boolean lessThan(HashemBigNumber left, HashemBigNumber right) {
        return left.compareTo(right) < 0;
    }

    @Fallback
    protected Object typeError(Object left, Object right) {
        throw HashemException.typeError(this, left, right);
    }

}