61 lines
1.3 KiB
Go
61 lines
1.3 KiB
Go
|
package reflector
|
||
|
|
|
||
|
|
import (
|
||
|
|
"fmt"
|
||
|
|
"strconv"
|
||
|
|
)
|
||
|
|
|
||
|
|
// ParseTag parses a golang struct tag into a map.
|
||
|
|
func ParseTag(tag string) (map[string]string, error) {
|
||
|
|
res := map[string]string{}
|
||
|
|
|
||
|
|
// This code is copied/modified from: reflect/type.go:
|
||
|
|
for tag != "" {
|
||
|
|
// Skip leading space.
|
||
|
|
i := 0
|
||
|
|
for i < len(tag) && tag[i] == ' ' {
|
||
|
|
i++
|
||
|
|
}
|
||
|
|
tag = tag[i:]
|
||
|
|
if tag == "" {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
|
||
|
|
// Scan to colon. A space, a quote or a control character is a syntax error.
|
||
|
|
// Strictly speaking, control chars include the range [0x7f, 0x9f], not just
|
||
|
|
// [0x00, 0x1f], but in practice, we ignore the multi-byte control characters
|
||
|
|
// as it is simpler to inspect the tag's bytes than the tag's runes.
|
||
|
|
i = 0
|
||
|
|
for i < len(tag) && tag[i] > ' ' && tag[i] != ':' && tag[i] != '"' && tag[i] != 0x7f {
|
||
|
|
i++
|
||
|
|
}
|
||
|
|
if i == 0 || i+1 >= len(tag) || tag[i] != ':' || tag[i+1] != '"' {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
name := string(tag[:i])
|
||
|
|
tag = tag[i+1:]
|
||
|
|
|
||
|
|
// Scan quoted string to find value.
|
||
|
|
i = 1
|
||
|
|
for i < len(tag) && tag[i] != '"' {
|
||
|
|
if tag[i] == '\\' {
|
||
|
|
i++
|
||
|
|
}
|
||
|
|
i++
|
||
|
|
}
|
||
|
|
if i >= len(tag) {
|
||
|
|
break
|
||
|
|
}
|
||
|
|
qvalue := string(tag[:i+1])
|
||
|
|
tag = tag[i+1:]
|
||
|
|
|
||
|
|
value, err := strconv.Unquote(qvalue)
|
||
|
|
if err != nil {
|
||
|
|
return nil, fmt.Errorf("Cannot unquote tag %s in %s: %s", name, tag, err.Error())
|
||
|
|
}
|
||
|
|
res[name] = value
|
||
|
|
}
|
||
|
|
|
||
|
|
return res, nil
|
||
|
|
}
|