/*
 * $Header$
 * $Revision$
 * $Date$
 *
 * ====================================================================
 *
 * Copyright (C) 2000-2002 bob mcwhirter & James Strachan.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions, and the disclaimer that follows 
 *    these conditions in the documentation and/or other materials 
 *    provided with the distribution.
 *
 * 3. The name "Jaxen" must not be used to endorse or promote products
 *    derived from this software without prior written permission.  For
 *    written permission, please contact license@jaxen.org.
 * 
 * 4. Products derived from this software may not be called "Jaxen", nor
 *    may "Jaxen" appear in their name, without prior written permission
 *    from the Jaxen Project Management (pm@jaxen.org).
 * 
 * In addition, we request (but do not require) that you include in the 
 * end-user documentation provided with the redistribution and/or in the 
 * software itself an acknowledgement equivalent to the following:
 *     "This product includes software developed by the
 *      Jaxen Project (http://www.jaxen.org/)."
 * Alternatively, the acknowledgment may be graphical using the logos 
 * available at http://www.jaxen.org/
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED.  IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 * ====================================================================
 * This software consists of voluntary contributions made by many 
 * individuals on behalf of the Jaxen Project and was originally 
 * created by bob mcwhirter <bob@werken.com> and 
 * James Strachan <jstrachan@apache.org>.  For more information on the 
 * Jaxen Project, please see <http://www.jaxen.org/>.
 * 
 * $Id$
 */


package org.jaxen.function;

import org.jaxen.Context;
import org.jaxen.Function;
import org.jaxen.FunctionCallException;
import org.jaxen.Navigator;
import org.jaxen.UnsupportedAxisException;
import org.jaxen.JaxenRuntimeException;

import java.text.NumberFormat;
import java.util.List;
import java.util.Iterator;
import java.util.Locale;

/**
 * <p><b>4.2</b> <code><i>string</i> string(<i>object</i>)</code>
 *
 * @author bob mcwhirter (bob @ werken.com)
 */
public class StringFunction implements Function
{
    
    private static NumberFormat format = NumberFormat.getInstance(Locale.ENGLISH);
    
    static {
        format.setGroupingUsed(false);
        format.setMaximumFractionDigits(32);
    }

    public Object call(Context context,
                       List args) throws FunctionCallException
    {
        int size = args.size();

        if ( size == 0 )
        {
            return evaluate( context.getNodeSet(),
                             context.getNavigator() );
        }
        else if ( size == 1 )
        {
            return evaluate( args.get(0),
                             context.getNavigator() );
        }

        throw new FunctionCallException( "string() requires one argument." );
    }
    
    public static String evaluate(Object obj,
                                  Navigator nav)
    {
        try
        {
            if (obj == null) {
                return "";
            }
            
            // Workaround because XOM uses lists for Text nodes
            // so we need to check for that first
            if (nav != null && nav.isText(obj))
            {
                return nav.getTextStringValue(obj);
            }
            
            if (obj instanceof List)
            {
                List list = (List) obj;
                if (list.isEmpty())
                {
                    return "";
                }
                // do not recurse: only first list should unwrap
                obj = list.get(0);
            }
            
            if (nav != null && (nav.isElement(obj) || nav.isDocument(obj)))
            {
                Iterator descendantAxisIterator = nav.getDescendantAxisIterator(obj);
                StringBuffer sb = new StringBuffer();
                while (descendantAxisIterator.hasNext())
                {
                    Object descendant = descendantAxisIterator.next();
                    if (nav.isText(descendant))
                    {
                        sb.append(nav.getTextStringValue(descendant));
                    }
                }
                return sb.toString();
            }
            else if (nav != null && nav.isAttribute(obj))
            {
                return nav.getAttributeStringValue(obj);
            }
            else if (nav != null && nav.isText(obj))
            {
                return nav.getTextStringValue(obj);
            }
            else if (nav != null && nav.isProcessingInstruction(obj))
            {
                return nav.getProcessingInstructionData(obj);
            }
            else if (nav != null && nav.isComment(obj))
            {
                return nav.getCommentStringValue(obj);
            }
            else if (nav != null && nav.isNamespace(obj))
            {
                return nav.getNamespaceStringValue(obj);
            }
            else if (obj instanceof String)
            {
                return (String) obj;
            }
            else if (obj instanceof Boolean)
            {
                return stringValue(((Boolean) obj).booleanValue());
            }
            else if (obj instanceof Number)
            {
                return stringValue(((Number) obj).doubleValue());
            }
            return "";
        }
        catch (UnsupportedAxisException e)
        {
            throw new JaxenRuntimeException(e);
        }

    }

    public static String stringValue(double value)
    {
        if (Double.isNaN(value)) return "NaN";
        return format.format(value);
    }

    public static String stringValue(boolean bool)
    {
        return bool ? "true" : "false";
    }

}

@@ -6749,16 +6749,154 @@
  %22NaN%22;%0A
+        else if (Double.isInfinite(value)) %7B%0A            if (value %3E 0) return %22Infinity%22;%0A            else return %22-Infinity%22;%0A        %7D%0A
         
@@ -6976,20 +6976,21 @@
 boolean 
-bool
+value
 )%0A    %7B%0A
@@ -7004,20 +7004,21 @@
  return 
-bool
+value
  ? %22true

Fixing formatting of inifinite numbers