my-log/models/meta.go

84 lines
1.7 KiB
Go

package models
import (
"bytes"
"encoding/json"
"errors"
"fmt"
"regexp"
"strconv"
"time"
"codeberg.org/danjones000/my-log/tools"
)
type Meta struct {
Key string
Value any
}
func (m Meta) MarshalText() ([]byte, error) {
if regexp.MustCompile(`\s`).MatchString(m.Key) {
return []byte{}, fmt.Errorf("whitespace is not allowed in key: %s", m.Key)
}
buff := &bytes.Buffer{}
buff.WriteRune('@')
buff.WriteString(m.Key)
buff.WriteRune(' ')
switch v := m.Value.(type) {
default:
return nil, fmt.Errorf("Unknown type %T", v)
case nil:
return []byte{}, nil
case string:
buff.WriteString(v)
case int:
buff.WriteString(strconv.Itoa(v))
case int64:
buff.WriteString(strconv.FormatInt(v, 10))
case float64:
buff.WriteString(strconv.FormatFloat(v, 'f', -1, 64))
case json.Number:
buff.WriteString(v.String())
case json.RawMessage:
buff.Write(v)
case []byte:
buff.Write(v)
case byte:
buff.WriteByte(v)
case rune:
buff.WriteString(string(v))
case bool:
buff.WriteString(strconv.FormatBool(v))
case time.Time:
buff.WriteString(v.Format(time.RFC3339))
}
return buff.Bytes(), nil
}
func (m *Meta) UnmarshalText(in []byte) error {
if len(in) == 0 {
return newParsingError(errors.New("Unable to Unmarshal empty string"))
}
re := regexp.MustCompile("(?s)^@([^ ]+) (.*)( @end)?$")
match := re.FindSubmatch(in)
if len(match) == 0 {
return newParsingError(fmt.Errorf("Failed to match %s", in))
}
m.Key = string(match[1])
return m.processMeta(match[2])
}
func (m *Meta) processMeta(in []byte) error {
if len(in) == 0 {
return newParsingError(errors.New("No value found"))
}
v := tools.ParseBytes(in)
if v == "" {
return newParsingError(errors.New("No value found"))
}
m.Value = v
return nil
}