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reflectx_tag.go
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reflectx_tag.go
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package reflectx
import (
"strconv"
"strings"
)
func TagValueAndFlags(tag string) (string, map[string]bool) {
values := strings.Split(tag, ",")
flags := make(map[string]bool)
if len(values[0]) > 1 {
for _, flag := range values[1:] {
flags[flag] = true
}
}
return values[0], flags
}
type StructTag string
func (t StructTag) Name() string {
s := string(t)
if i := strings.Index(s, ","); i >= 0 {
if i == 0 {
return ""
}
return s[0:i]
}
return s
}
func (t StructTag) HasFlag(flg string) bool {
idx := strings.Index(string(t), flg)
return idx > 0
}
func ParseStructTag(tag string) map[string]StructTag {
flags := map[string]StructTag{}
for i := 0; tag != ""; {
// skip spaces
i = 0
for i < len(tag) && tag[i] == ' ' {
i++
}
tag = tag[i:]
if tag == "" {
break
}
// meet flag name
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 := tag[:i]
tag = tag[i+1:]
// meet flag value and unquote it
i = 1
for i < len(tag) && tag[i] != '"' {
if tag[i] == '\\' {
i++
}
i++
}
if i >= len(tag) {
break
}
quoted := tag[:i+1]
tag = tag[i+1:]
value, err := strconv.Unquote(quoted)
if err != nil {
break
}
flags[name] = StructTag(value)
}
return flags
}