mirror of git://gcc.gnu.org/git/gcc.git
124 lines
4.0 KiB
Java
124 lines
4.0 KiB
Java
/* LangFunction.java --
|
|
Copyright (C) 2004,2006 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., 51 Franklin Street, Fifth Floor, Boston, MA
|
|
02110-1301 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 javax.xml.namespace.QName;
|
|
import org.w3c.dom.Element;
|
|
import org.w3c.dom.Node;
|
|
|
|
/**
|
|
* The <code>lang</code> function returns true or false depending on whether
|
|
* the language of the context node as specified by xml:lang attributes is
|
|
* the same as or is a sublanguage of the language specified by the argument
|
|
* string. The language of the context node is determined by the value of
|
|
* the xml:lang attribute on the context node, or, if the context node has
|
|
* no xml:lang attribute, by the value of the xml:lang attribute on the
|
|
* nearest ancestor of the context node that has an xml:lang attribute. If
|
|
* there is no such attribute, then lang returns false. If there is such an
|
|
* attribute, then lang returns true if the attribute value is equal to the
|
|
* argument ignoring case, or if there is some suffix starting with - such
|
|
* that the attribute value is equal to the argument ignoring that suffix of
|
|
* the attribute value and ignoring case.
|
|
*
|
|
* @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
|
|
*/
|
|
final class LangFunction
|
|
extends Expr
|
|
{
|
|
|
|
final Expr arg;
|
|
|
|
LangFunction(List<Expr> args)
|
|
{
|
|
this(args.get(0));
|
|
}
|
|
|
|
LangFunction(Expr arg)
|
|
{
|
|
this.arg = arg;
|
|
}
|
|
|
|
@Override
|
|
public Object evaluate(Node context, int pos, int len)
|
|
{
|
|
Object val = arg.evaluate(context, pos, len);
|
|
String lang = _string(context, val);
|
|
String clang = getLang(context);
|
|
while (clang == null && context != null)
|
|
{
|
|
context = context.getParentNode();
|
|
clang = getLang(context);
|
|
}
|
|
boolean ret = (clang == null) ? false :
|
|
clang.toLowerCase().startsWith(lang.toLowerCase());
|
|
return ret ? Boolean.TRUE : Boolean.FALSE;
|
|
}
|
|
|
|
String getLang(Node node)
|
|
{
|
|
while (node != null)
|
|
{
|
|
if (node.getNodeType() == Node.ELEMENT_NODE)
|
|
{
|
|
String lang = ((Element) node).getAttribute("xml:lang");
|
|
if (lang != null)
|
|
return lang;
|
|
}
|
|
node = node.getParentNode();
|
|
}
|
|
return null;
|
|
}
|
|
|
|
public Expr clone(Object context)
|
|
{
|
|
return new IdFunction(arg.clone(context));
|
|
}
|
|
|
|
public boolean references(QName var)
|
|
{
|
|
return arg.references(var);
|
|
}
|
|
|
|
public String toString()
|
|
{
|
|
return "lang(" + arg + ")";
|
|
}
|
|
|
|
}
|