// $Id: FunctionOpt1.java,v 1.1 2002/04/25 18:07:38 bill Exp $

package com.jclark.xsl.expr;

import com.jclark.xsl.om.Node;

abstract class FunctionOpt1 implements Function {
    abstract ConvertibleExpr makeCallExpr(ConvertibleExpr e) throws ParseException;

    public ConvertibleExpr makeCallExpr(ConvertibleExpr e[], Node exprNode) throws ParseException {
        if (e.length > 1)
            throw new ParseException("expected zero or one argument");
        return makeCallExpr(e.length == 0 ? new SelfAxisExpr() : e[0]);
    }
}