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
|
package eval
import "strings"
// ParseVariableRef parses a variable reference.
func ParseVariableRef(text string) (explode bool, ns string, name string) {
return parseVariableRef(text, true)
}
// ParseIncompleteVariableRef parses an incomplete variable reference.
func ParseIncompleteVariableRef(text string) (explode bool, ns string, name string) {
return parseVariableRef(text, false)
}
func parseVariableRef(text string, complete bool) (explode bool, ns string, name string) {
explodePart, nsPart, name := splitVariableRef(text, complete)
ns = nsPart
if len(ns) > 0 {
ns = ns[:len(ns)-1]
}
return explodePart != "", ns, name
}
// SplitVariableRef splits a variable reference into three parts: an optional
// explode operator (either "" or "@"), a namespace part, and a name part.
func SplitVariableRef(text string) (explodePart, nsPart, name string) {
return splitVariableRef(text, true)
}
// SplitIncompleteVariableRef splits an incomplete variable reference into three
// parts: an optional explode operator (either "" or "@"), a namespace part, and
// a name part.
func SplitIncompleteVariableRef(text string) (explodePart, nsPart, name string) {
return splitVariableRef(text, false)
}
func splitVariableRef(text string, complete bool) (explodePart, nsPart, name string) {
if text == "" {
return "", "", ""
}
e, qname := "", text
if text[0] == '@' {
e = "@"
qname = text[1:]
}
if qname == "" {
return e, "", ""
}
i := strings.LastIndexByte(qname, ':')
if complete && i == len(qname)-1 {
i = strings.LastIndexByte(qname[:len(qname)-1], ':')
}
return e, qname[:i+1], qname[i+1:]
}
// MakeVariableRef builds a variable reference.
func MakeVariableRef(explode bool, ns string, name string) string {
prefix := ""
if explode {
prefix = "@"
}
if ns != "" {
prefix += ns + ":"
}
return prefix + name
}
|
