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utl.go
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utl.go
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package fluentbitconfig
import (
"bytes"
"encoding"
"encoding/json"
"fmt"
"strconv"
"strings"
)
// anyFromString used to convert property values from the classic config
// to any type.
func anyFromString(s string) any {
// not using strconv since the boolean parser is not very strict
// and allows: 1, t, T, 0, f, F.
if strings.EqualFold(s, "true") {
return true
}
if strings.EqualFold(s, "false") {
return false
}
if v, err := strconv.ParseInt(s, 10, 64); err == nil {
return v
}
if v, err := strconv.ParseFloat(s, 64); err == nil {
return v
}
if u, err := strconv.Unquote(s); err == nil {
return u
}
return s
}
// stringFromAny -
// TODO: Handle more data types.
func stringFromAny(v any) string {
switch t := v.(type) {
case encoding.TextMarshaler:
if b, err := t.MarshalText(); err == nil {
return stringFromAny(string(b))
}
case fmt.Stringer:
return stringFromAny(t.String())
case json.Marshaler:
if b, err := t.MarshalJSON(); err == nil {
return stringFromAny(string(b))
}
case map[string]any:
var buff bytes.Buffer
enc := json.NewEncoder(&buff)
enc.SetEscapeHTML(false)
if err := enc.Encode(t); err == nil {
return buff.String()
}
case float32:
if isFloatInt(t) {
return strconv.FormatInt(int64(t), 10)
}
return fmtFloat(t)
case float64:
if isFloatInt(t) {
return strconv.FormatInt(int64(t), 10)
}
return fmtFloat(t)
case string:
if strings.Contains(t, "\n") {
return fmt.Sprintf("%q", t)
}
if t == "" {
return `""`
}
return t
}
return stringFromAny(fmt.Sprintf("%v", v))
}
// isFloatInt reports whether a float is an integer number
// with no fractional part.
func isFloatInt[F float32 | float64](f F) bool {
switch t := any(f).(type) {
case float32:
return t == float32(int32(f))
case float64:
return t == float64(int64(f))
}
return false
}
func fmtFloat[F float32 | float64](f F) string {
s := fmt.Sprintf("%f", f)
s = strings.TrimRight(s, "0")
s = strings.TrimRight(s, ".")
return s
}
func intFromAny(v any) (int, bool) {
if v == nil {
return 0, false
}
switch v := v.(type) {
case int:
return v, true
case int32:
return int(v), true
case int64:
if int64(int(v)) == v {
return int(v), true
}
case float32:
return int(v), true
case float64:
if float64(int(v)) == v {
return int(v), true
}
case string:
if i, err := strconv.Atoi(v); err == nil {
return i, true
}
}
return 0, false
}