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]);
  }
}