| /* NormalizeSpaceFunction.java -- |
| Copyright (C) 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath 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 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA |
| 02111-1307 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| package gnu.xml.xpath; |
| |
| import java.util.List; |
| import java.util.StringTokenizer; |
| import org.w3c.dom.Node; |
| |
| /** |
| * The <code>normalize-space</code> function returns the argument string |
| * with whitespace normalized by stripping leading and trailing whitespace |
| * and replacing sequences of whitespace characters by a single space. |
| * Whitespace characters are the same as those allowed by the S production |
| * in XML. If the argument is omitted, it defaults to the context node |
| * converted to a string, in other words the string-value of the context |
| * node. |
| * |
| * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a> |
| */ |
| final class NormalizeSpaceFunction |
| extends Expr |
| { |
| |
| final Expr arg; |
| |
| NormalizeSpaceFunction(List args) |
| { |
| this((Expr) args.get(0)); |
| } |
| |
| NormalizeSpaceFunction(Expr arg) |
| { |
| this.arg = arg; |
| } |
| |
| public Object evaluate(Node context, int pos, int len) |
| { |
| Object val = (arg == null) ? null : arg.evaluate(context, pos, len); |
| String s = _string(context, val); |
| StringTokenizer st = new StringTokenizer(s, " \t\r\n"); |
| StringBuffer buf = new StringBuffer(); |
| if (st.hasMoreTokens()) |
| { |
| buf.append(st.nextToken()); |
| while (st.hasMoreTokens()) |
| { |
| buf.append(' '); |
| buf.append(st.nextToken()); |
| } |
| } |
| return buf.toString(); |
| } |
| |
| public Expr clone(Object context) |
| { |
| return new NormalizeSpaceFunction(arg.clone(context)); |
| } |
| |
| public String toString() |
| { |
| return (arg == null) ? "normalize-space()" : "normalize-space(" + arg + ")"; |
| } |
| |
| } |