package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

class GenerateIdFunction extends FunctionOpt1 {
  ConvertibleExpr makeCallExpr(ConvertibleExpr expr) throws ParseException {
    final NodeSetExpr nse = expr.makeNodeSetExpr();
    return new ConvertibleStringExpr() {
      public String eval(Node node, ExprContext context) throws XSLException {
	node = nse.eval(node, context).next();
	if (node != null)
	  return node.getGeneratedId();
	return "";
      }
    };
  }
}