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

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package com.github.dakusui.lisj.special;

import org.apache.commons.lang3.ArrayUtils;

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

import static com.github.dakusui.lisj.Basic.*;

public class Eval extends BaseForm {

	/**
	 * Serial version UID.
	 */
	private static final long serialVersionUID = -6700796596065088982L;

	@Override
	protected FormResult evaluateEach(Context context, Object currentParam,
			FormResult lastResult) throws JCUnitException, CUT {
		return evaluateEachSimply(context, currentParam, lastResult);
	}
	
	@Override
	protected FormResult evaluateLast(
			Context context,
			Object[] evaluatedParams, 
			FormResult lastResult
			) throws JCUnitException, CUT {
		FormResult ret = lastResult;
		
		if (evaluatedParams[0] instanceof Form) {
			Form form = (Form) evaluatedParams[0];
			Object[] cdr = ArrayUtils.subarray(evaluatedParams, 1, evaluatedParams.length);
			ret.value(form.evaluate(context, cdr));
		} else {
			////
			// It is guaranteed that more there are than one parameters by checkParams
			// method.
			ret.value(evaluatedParams[evaluatedParams.length - 1]);
		}
		return ret;
	}
	
	@Override
	protected Object checkParams(Object params) {
		if (length(super.checkParams(params)) < 1) {
			throw new IllegalArgumentException(msgParameterLengthWrong(">=0", params));
		}
		return params;
	}
}