content: // (c) ALEXANDRE BRILLANT : http://www.japisoft.com
  // All this work is confidential, you have rights to
  // change and evolve it for your products but you
  // have no rights to sell it, propose concurrent works.
  // Morever any changes to bugs or evolutions should
  // be send to JAPISOFT that needs to maintain a
  // valid version and has all rights on the product.
  
  
  package com.japisoft.xpath.function.basic;
  
  import com.japisoft.xpath.function.*;
  import com.japisoft.xpath.XPathContext;
  import com.japisoft.xpath.FastVector;
  
  /**
  This program is available under two licenses : 
  
  1. For non commercial usage : 
  
  This program is free software: you can redistribute it and/or modify
  it under the terms of the GNU General Public License as published by
  the Free Software Foundation, either version 3 of the License, or
  (at your option) any later version.
  
  This program is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  GNU General Public License for more details.
  
  You should have received a copy of the GNU General Public License
  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  
  2. For commercial usage :
  
  You need to get a commercial license for source usage at : 
  
  http://www.editix.com/buy.html
  
  Copyright (c) 2018 Alexandre Brillant - JAPISOFT SARL - http://www.japisoft.com
  
  @author Alexandre Brillant - abrillant@japisoft.com
  @author JAPISOFT SARL - http://www.japisoft.com
  
  */
  public final class NormalizeSpace extends AbstractFunction {
      public NormalizeSpace() {
  	super();
      }
  
      public Object eval( XPathContext context, FastVector arg ) {
  	java.lang.String s = null;
  
  	if ( arg.size() == 1 ) {
  	    s = ( "" + arg.elementAt( 0 ) );
  	} else {
  	    Object cn = context.getNodeFromContext();
  	    if ( cn == null )
  		return "";
              s = context.getStringValue( cn );
  	}
  
  	StringBuffer sb = new StringBuffer();
  	char[] ch = s.toCharArray();
          if ( ch.length == 0 )
            return "";
  	char[] r = new char[ ch.length ];
  	char lastCh = ' ';
  	boolean ns = false;
  	int l = 0;
  
  	for ( int i = 0; i < ch.length; i++ ) {
  	    if ( ch[ i ] == ' ' ||
  		 ch[ i ] == '\t' ||
  		 ch[ i ] == '\n' ||
  		 ch[ i ] == '\r' ) {
  		if ( ( lastCh != ch[ i ] ) &&
  		     ( ns ) )
  		    r[ l++ ] = ch[ i ];
  
  	    } else {
  		ns = true;
  		r[ l++ ] = ch[ i ];
  	    }
  	    lastCh = ch[ i ];
  	}
  	if ( ( r[ l - 1 ] == ' ' ) ||
  	     ( r[ l - 1 ] == '\t' ) ||
  	     ( r[ l - 1 ] == '\n' ) ||
  	     ( r[ l - 1 ] == '\r' ) )
  	    l--;
  	return new java.lang.String( r, 0, l );
      }
  
  }
  
  // Contains ends here
  