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
219
220
221
222
223
224
225
226
227
228
229
230
|
/*
Package xmlquery provides extract data from XML documents using XPath expression.
*/
package xmlquery
import (
"fmt"
"strings"
"github.com/antchfx/xpath"
)
// SelectElements finds child elements with the specified name.
func (n *Node) SelectElements(name string) []*Node {
return Find(n, name)
}
// SelectElement finds child elements with the specified name.
func (n *Node) SelectElement(name string) *Node {
return FindOne(n, name)
}
// SelectAttr returns the attribute value with the specified name.
func (n *Node) SelectAttr(name string) string {
var local, space string
local = name
if i := strings.Index(name, ":"); i > 0 {
space = name[:i]
local = name[i+1:]
}
for _, attr := range n.Attr {
if attr.Name.Local == local && attr.Name.Space == space {
return attr.Value
}
}
return ""
}
var _ xpath.NodeNavigator = &NodeNavigator{}
// CreateXPathNavigator creates a new xpath.NodeNavigator for the specified html.Node.
func CreateXPathNavigator(top *Node) *NodeNavigator {
return &NodeNavigator{curr: top, root: top, attr: -1}
}
// Find searches the Node that matches by the specified XPath expr.
func Find(top *Node, expr string) []*Node {
exp, err := xpath.Compile(expr)
if err != nil {
panic(err)
}
t := exp.Select(CreateXPathNavigator(top))
var elems []*Node
for t.MoveNext() {
elems = append(elems, (t.Current().(*NodeNavigator)).curr)
}
return elems
}
// FindOne searches the Node that matches by the specified XPath expr,
// and returns first element of matched.
func FindOne(top *Node, expr string) *Node {
exp, err := xpath.Compile(expr)
if err != nil {
panic(err)
}
t := exp.Select(CreateXPathNavigator(top))
var elem *Node
if t.MoveNext() {
elem = (t.Current().(*NodeNavigator)).curr
}
return elem
}
// FindEach searches the html.Node and calls functions cb.
func FindEach(top *Node, expr string, cb func(int, *Node)) {
exp, err := xpath.Compile(expr)
if err != nil {
panic(err)
}
t := exp.Select(CreateXPathNavigator(top))
var i int
for t.MoveNext() {
cb(i, (t.Current().(*NodeNavigator)).curr)
i++
}
}
type NodeNavigator struct {
root, curr *Node
attr int
}
func (x *NodeNavigator) Current() *Node {
return x.curr
}
func (x *NodeNavigator) NodeType() xpath.NodeType {
switch x.curr.Type {
case CommentNode:
return xpath.CommentNode
case TextNode:
return xpath.TextNode
case DeclarationNode, DocumentNode:
return xpath.RootNode
case ElementNode:
if x.attr != -1 {
return xpath.AttributeNode
}
return xpath.ElementNode
}
panic(fmt.Sprintf("unknown XML node type: %v", x.curr.Type))
}
func (x *NodeNavigator) LocalName() string {
if x.attr != -1 {
return x.curr.Attr[x.attr].Name.Local
}
return x.curr.Data
}
func (x *NodeNavigator) Prefix() string {
return x.curr.Prefix
}
func (x *NodeNavigator) Value() string {
switch x.curr.Type {
case CommentNode:
return x.curr.Data
case ElementNode:
if x.attr != -1 {
return x.curr.Attr[x.attr].Value
}
return x.curr.InnerText()
case TextNode:
return x.curr.Data
}
return ""
}
func (x *NodeNavigator) Copy() xpath.NodeNavigator {
n := *x
return &n
}
func (x *NodeNavigator) MoveToRoot() {
x.curr = x.root
}
func (x *NodeNavigator) MoveToParent() bool {
if x.attr != -1 {
x.attr = -1
return true
} else if node := x.curr.Parent; node != nil {
x.curr = node
return true
}
return false
}
func (x *NodeNavigator) MoveToNextAttribute() bool {
if x.attr >= len(x.curr.Attr)-1 {
return false
}
x.attr++
return true
}
func (x *NodeNavigator) MoveToChild() bool {
if x.attr != -1 {
return false
}
if node := x.curr.FirstChild; node != nil {
x.curr = node
return true
}
return false
}
func (x *NodeNavigator) MoveToFirst() bool {
if x.attr != -1 || x.curr.PrevSibling == nil {
return false
}
for {
node := x.curr.PrevSibling
if node == nil {
break
}
x.curr = node
}
return true
}
func (x *NodeNavigator) String() string {
return x.Value()
}
func (x *NodeNavigator) MoveToNext() bool {
if x.attr != -1 {
return false
}
if node := x.curr.NextSibling; node != nil {
x.curr = node
return true
}
return false
}
func (x *NodeNavigator) MoveToPrevious() bool {
if x.attr != -1 {
return false
}
if node := x.curr.PrevSibling; node != nil {
x.curr = node
return true
}
return false
}
func (x *NodeNavigator) MoveTo(other xpath.NodeNavigator) bool {
node, ok := other.(*NodeNavigator)
if !ok || node.root != x.root {
return false
}
x.curr = node.curr
x.attr = node.attr
return true
}
|