com.github.dakusui.lisj.special.Cond Maven / Gradle / Ivy

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package com.github.dakusui.lisj.special;

import com.github.dakusui.jcunit.exceptions.JCUnitException;
import com.github.dakusui.lisj.BaseForm;
import com.github.dakusui.lisj.Basic;
import com.github.dakusui.lisj.CUT;
import com.github.dakusui.lisj.Context;
import com.github.dakusui.lisj.FormResult;

public class Cond extends BaseForm {
	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = -7534444891858202067L;

	@Override
	protected FormResult evaluateEach(Context context,
			Object currentParam, FormResult lastResult) throws JCUnitException, CUT {
		boolean successfullyEvaluated = false;
		FormResult ret = lastResult;
		try {
			ret = evaluateEachSimply(context, currentParam, lastResult);
			successfullyEvaluated = true;
		} catch (CUT e) {
			if (e.source() == Basic.car(currentParam)) {
				ret.value(e.value());
			} else {
				// some other underlying form/predicate threw a CUT.
				throw e;
			}
		} finally {
			if (successfullyEvaluated) cut(ret.value());
		}
		return ret;
	}

	@Override
	protected FormResult evaluateLast(Context context,
			Object[] evaluatedParams, FormResult lastResult) {
		return lastResult;
	}
}