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package com.cloudbees.groovy.cps.impl;

import com.cloudbees.groovy.cps.Block;
import com.cloudbees.groovy.cps.Continuation;
import com.cloudbees.groovy.cps.Env;
import com.cloudbees.groovy.cps.Next;
import org.codehaus.groovy.runtime.typehandling.DefaultTypeTransformation;

/**
 * x ?: y
 *
 * @author Kohsuke Kawaguchi
 */
public class ElvisBlock implements Block {
    final Block cond, falseExp;


    public ElvisBlock(Block cond, Block falseExp) {
        this.cond = cond;
        this.falseExp = falseExp;
    }

    public Next eval(Env e, Continuation k) {
        return new ContinuationImpl(e,k).then(cond,e,jump);
    }

    class ContinuationImpl extends ContinuationGroup {
        final Continuation k;
        final Env e;

        ContinuationImpl(Env e, Continuation k) {
            this.e = e;
            this.k = k;
        }

        public Next jump(Object cond) {
            if (DefaultTypeTransformation.castToBoolean(cond)) {
                return k.receive(cond);
            } else {
                return then(falseExp, e, k);
            }
        }

        private static final long serialVersionUID = 1L;
    }

    static final ContinuationPtr jump = new ContinuationPtr(ContinuationImpl.class,"jump");

    private static final long serialVersionUID = 1L;
}