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
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
|
/* __ *\
** ________ ___ / / ___ Scala API **
** / __/ __// _ | / / / _ | (c) 2003-2009, LAMP/EPFL **
** __\ \/ /__/ __ |/ /__/ __ | http://scala-lang.org/ **
** /____/\___/_/ |_/____/_/ | | **
** |/ **
\* */
// $Id$
package scala.xml
import collection.immutable
import collection.generic._
import collection.mutable.ListBuffer
/** This object ...
*
* @author Burak Emir
* @version 1.0
*/
object NodeSeq {
final val Empty = new NodeSeq { def theSeq = Nil }
def fromSeq(s: Seq[Node]): NodeSeq = new NodeSeq {
def theSeq = s
}
type Coll = NodeSeq
implicit def builderFactory: BuilderFactory[Node, NodeSeq, Coll] = new BuilderFactory[Node, NodeSeq, Coll] { def apply(from: Coll) = newBuilder }
def newBuilder: Builder[Node, NodeSeq] = new ListBuffer[Node] mapResult fromSeq
implicit def seqToNodeSeq(s: Seq[Node]): NodeSeq = fromSeq(s)
}
/** This class implements a wrapper around <code>Seq[Node]</code> that
* adds XPath and comprehension methods.
*
* @author Burak Emir
* @version 1.0
*/
abstract class NodeSeq extends immutable.Sequence[Node] with SequenceTemplate[Node, NodeSeq] {
import NodeSeq.seqToNodeSeq // import view magic for NodeSeq wrappers
/** Creates a list buffer as builder for this class */
override protected[this] def newBuilder = NodeSeq.newBuilder
def theSeq: Seq[Node]
def length = theSeq.length
override def iterator = theSeq.iterator
def apply(i: Int): Node = theSeq.apply(i)
def apply(f: Node => Boolean): NodeSeq = filter(f)
/** structural equality */
override def equals(x: Any): Boolean = x match {
case z:Node => (length == 1) && z == apply(0)
case z:Seq[_] => sameElements(z)
case z:String => text == z
case _ => false;
}
/** Projection function. Similar to XPath, use <code>this \ "foo"</code>
* to get a list of all elements of this sequence that are labelled with
* <code>"foo"</code>. Use <code>\ "_"</code> as a wildcard. Use
* <code>ns \ "@foo"</code> to get the unprefixed attribute "foo".
* Use <code>ns \ "@{uri}foo"</code> to get the prefixed attribute
* "pre:foo" whose prefix "pre" is resolved to the namespace "uri".
* For attribute projections, the resulting NodeSeq attribute values are
* wrapped in a Group.
* There is no support for searching a prefixed attribute by
* its literal prefix.
* The document order is preserved.
*
* @param that ...
* @return ...
*/
def \(that: String): NodeSeq = that match {
case "_" =>
var zs: List[Node] = Nil
val it = this.iterator
while (it.hasNext) {
val x = it.next
val jt = x.child.iterator
while (jt.hasNext) {
val y = jt.next
if (y.typeTag$ != -1)
zs = y::zs
}
}
NodeSeq.fromSeq(zs.reverse)
case _ if (that.charAt(0) == '@') && (this.length == 1) =>
if (that.length() == 1)
throw new IllegalArgumentException(that)
if (that.charAt(1) == '{') {
val i = that.indexOf('}')
if (i == -1)
throw new IllegalArgumentException(that)
val (uri, key) = (that.substring(2,i), that.substring(i+1, that.length()))
if (uri == "" || key == "")
throw new IllegalArgumentException(that)
val y = this(0)
y.attribute(uri, key) match {
case Some(x) => Group(x)
case _ => NodeSeq.Empty
}
} else {
val k = that.substring(1)
val y = this(0)
y.attribute(k) match {
case Some(x) => Group(x)
case _ => NodeSeq.Empty
}
}
case _ =>
var zs: List[Node] = Nil
val it = this.iterator
while (it.hasNext) {
val x = it.next
val jt = x.child.iterator
while (jt.hasNext) {
val y = jt.next
if (y.label == that)
zs = y::zs
}
}
NodeSeq.fromSeq(zs.reverse)
}
/** projection function. Similar to XPath, use <code>this \\ 'foo</code>
* to get a list of all elements of this sequence that are labelled with
* <code>"foo"</code>. Use <code>\\ "_"</code> as a wildcard. Use
* <code>ns \\ "@foo"</code> to get the unprefixed attribute "foo".
* Use <code>ns \\ "@{uri}foo"</code> to get each prefixed attribute
* "pre:foo" whose prefix "pre" is resolved to the namespace "uri".
* For attribute projections, the resulting NodeSeq attribute values are
* wrapped in a Group.
* There is no support for searching a prefixed attribute by
* its literal prefix.
* The document order is preserved.
*
* @param that ...
* @return ...
*/
def \\ (that: String): NodeSeq = that match {
case "_" =>
var zs: List[Node] = Nil
val it = this.iterator
while (it.hasNext) {
val x = it.next
val jt = x.descendant_or_self.iterator
while (jt.hasNext) {
val y = jt.next
if (y.typeTag$ != -1)
zs = y::zs
}
}
zs.reverse
case _ if that.charAt(0) == '@' =>
var zs: List[Node] = Nil
val it = this.iterator
while (it.hasNext) {
val x = it.next
val jt = x.descendant_or_self.iterator
while (jt.hasNext) {
val y = jt.next
if (y.typeTag$ != -1) {
val kt = (y \ that).iterator
while (kt.hasNext) {
zs = (kt.next)::zs
}
}
}
}
zs.reverse
case _ =>
var zs: List[Node] = Nil
val it = this.iterator
while (it.hasNext) {
val x = it.next
val jt = x.descendant_or_self.iterator
while (jt.hasNext) {
val y = jt.next
if (y.typeTag$ != -1 && y.label == that)
zs = y::zs
}
}
zs.reverse
}
override def toString(): String = theSeq.iterator.foldLeft ("") {
(s: String, x: Node) => s + x.toString()
}
/*
def map(f: Node => NodeSeq): NodeSeq = flatMap(f)
def flatMap(f: Node => NodeSeq): NodeSeq = {
val y = toList flatMap { x => f(x).toList }
y
}
override def filter(f: Node => Boolean): NodeSeq = {
val x = toList filter f
x
}
*/
def text: String = {
val sb = new StringBuilder()
val it = this.iterator
while (it.hasNext) {
sb.append(it.next.text)
}
sb.toString()
}
}
|