1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
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));
}
}
|
