package com.jclark.xsl.expr;

import com.jclark.xsl.om.*;

class NamespaceFunction 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) {
	  Name name = node.getName();
	  if (name != null) {
	    String ns = name.getNamespace();
	    if (ns != null)
	      return ns;
	  }
	}
	return "";
      }
    };
  }
}