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/**
* (The MIT License)
*
* Copyright (c) 2008 - 2011:
*
* * {Aaron Patterson}[http://tenderlovemaking.com]
* * {Mike Dalessio}[http://mike.daless.io]
* * {Charles Nutter}[http://blog.headius.com]
* * {Sergio Arbeo}[http://www.serabe.com]
* * {Patrick Mahoney}[http://polycrystal.org]
* * {Yoko Harada}[http://yokolet.blogspot.com]
*
* Permission is hereby granted, free of charge, to any person obtaining
* a copy of this software and associated documentation files (the
* 'Software'), to deal in the Software without restriction, including
* without limitation the rights to use, copy, modify, merge, publish,
* distribute, sublicense, and/or sell copies of the Software, and to
* permit persons to whom the Software is furnished to do so, subject to
* the following conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED 'AS IS', WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package nokogiri.internals;
import java.util.List;
import javax.xml.xpath.XPathFunction;
import javax.xml.xpath.XPathFunctionException;
import javax.xml.namespace.QName;
import org.jruby.Ruby;
import org.jruby.RubyArray;
import org.jruby.RubyBoolean;
import org.jruby.RubyFixnum;
import org.jruby.RubyFloat;
import org.jruby.RubyInteger;
import org.jruby.RubyString;
import org.jruby.javasupport.JavaUtil;
import org.jruby.runtime.Helpers;
import org.jruby.runtime.ThreadContext;
import org.jruby.runtime.builtin.IRubyObject;
import org.w3c.dom.NodeList;
import nokogiri.XmlNode;
import nokogiri.XmlNodeSet;
import static nokogiri.internals.NokogiriHelpers.nodeListToRubyArray;
/**
* Xpath function handler.
*
* @author sergio
* @author Yoko Harada <yokolet@gmail.com>
*/
public class NokogiriXPathFunction implements XPathFunction {
private final IRubyObject handler;
private final QName name;
private final int arity;
public static NokogiriXPathFunction create(IRubyObject handler, QName name, int arity) {
return new NokogiriXPathFunction(handler, name, arity);
}
private NokogiriXPathFunction(IRubyObject handler, QName name, int arity) {
this.handler = handler;
this.name = name;
this.arity = arity;
}
public Object evaluate(List args) throws XPathFunctionException {
if (args.size() != this.arity) {
throw new XPathFunctionException("arity does not match");
}
if (name.getNamespaceURI().equals(NokogiriNamespaceContext.NOKOGIRI_BUILTIN_URI)) {
if (name.getLocalPart().equals("css-class")) {
return builtinCssClass(args);
}
}
if (this.handler.isNil()) {
throw new XPathFunctionException("no custom function handler declared for '" + name + "'");
}
final Ruby runtime = this.handler.getRuntime();
ThreadContext context = runtime.getCurrentContext();
IRubyObject result = Helpers.invoke(context, this.handler, this.name.getLocalPart(),
fromObjectToRubyArgs(runtime, args));
return fromRubyToObject(runtime, result);
}
private static IRubyObject[] fromObjectToRubyArgs(final Ruby runtime, List args) {
IRubyObject[] newArgs = new IRubyObject[args.size()];
for(int i = 0; i < args.size(); i++) {
newArgs[i] = fromObjectToRuby(runtime, args.get(i));
}
return newArgs;
}
private static IRubyObject fromObjectToRuby(final Ruby runtime, Object obj) {
// argument object type is one of NodeList, String, Boolean, or Double.
if (obj instanceof NodeList) {
IRubyObject[] nodes = nodeListToRubyArray(runtime, (NodeList) obj);
return XmlNodeSet.newNodeSet(runtime, nodes);
}
return JavaUtil.convertJavaToUsableRubyObject(runtime, obj);
}
private static Object fromRubyToObject(final Ruby runtime, IRubyObject obj) {
if (obj instanceof RubyString) return obj.asJavaString();
if (obj instanceof RubyBoolean) return obj.toJava(Boolean.class);
if (obj instanceof RubyFloat) return obj.toJava(Double.class);
if (obj instanceof RubyInteger) {
if ( obj instanceof RubyFixnum ) return RubyFixnum.fix2long(obj);
return obj.toJava(java.math.BigInteger.class);
}
if (obj instanceof XmlNodeSet) return obj;
if (obj instanceof RubyArray) {
return XmlNodeSet.newNodeSet(runtime, ((RubyArray) obj).toJavaArray());
}
/*if (o instanceof XmlNode)*/ return ((XmlNode) obj).getNode();
}
private static boolean builtinCssClass(List args) throws XPathFunctionException {
if (args.size() != 2) {
throw new XPathFunctionException("builtin function nokogiri:css-class takes two arguments");
}
String hay = args.get(0).toString();
String needle = args.get(1).toString();
if (needle.length() == 0) {
return true;
}
int j = 0;
int j_lim = hay.length() - needle.length();
while (j <= j_lim) {
int k;
for (k = 0; k < needle.length(); k++) {
if (needle.charAt(k) != hay.charAt(j+k)) {
break;
}
}
if (k == needle.length()) {
if ((hay.length() == (j+k)) || isWhitespace(hay.charAt(j+k))) {
return true ;
}
}
/* advance str to whitespace */
while (j <= j_lim && !isWhitespace(hay.charAt(j))) {
j++;
}
/* advance str to start of next word or end of string */
while (j <= j_lim && isWhitespace(hay.charAt(j))) {
j++;
}
}
return false;
}
private static boolean isWhitespace(char subject) {
// see libxml2's xmlIsBlank_ch()
return ((subject == 0x09) || (subject == 0x0A) || (subject == 0x0D) || (subject == 0x20));
}
}
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