/
json_literal.go
98 lines (88 loc) · 2.24 KB
/
json_literal.go
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// Copyright (C) 2022 Sneller, Inc.
// This program is free software: you can redistribute it and/or modify
// it under the terms of the GNU Affero General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
// GNU Affero General Public License for more details.
//
// You should have received a copy of the GNU Affero General Public License
// along with this program. If not, see <http://www.gnu.org/licenses/>.
package elastic_proxy
import (
"encoding/json"
"errors"
"strconv"
"strings"
"time"
)
type JSONLiteral struct {
// string, bool or float64
Value any
}
var (
ErrUnsupportedLiteralType = errors.New("unsupported literal type")
)
func NewJSONLiteral(v any) (JSONLiteral, error) {
jl := JSONLiteral{}
if err := jl.set(v); err != nil {
return jl, err
}
return jl, nil
}
func (jl *JSONLiteral) String() string {
if jl.Value == nil {
return "NULL"
}
switch v := jl.Value.(type) {
case bool:
if v {
return "TRUE"
}
return "FALSE"
case int:
return strconv.Itoa(v)
case int64:
return strconv.FormatInt(v, 10)
case float64:
return strconv.FormatFloat(v, 'f', -1, 64)
case time.Time:
return "`" + v.Format(time.RFC3339Nano) + "`"
case string:
if strings.HasPrefix(v, "/") && strings.HasSuffix(v, "/") {
return v
}
return `'` + strings.ReplaceAll(v, `'`, `\'`) + `'`
default:
panic("unsupported type in JSON literal")
}
}
func (jl *JSONLiteral) UnmarshalJSON(data []byte) error {
var v any
// we prefer int64 over float64, so we'll explicitly
// unmarshal as an int64 before doing the generic
// unmarshal that prefers float64 over int64.
var vi int64
if err := json.Unmarshal(data, &vi); err != nil {
if err = json.Unmarshal(data, &v); err != nil {
return err
}
} else {
v = vi
}
return jl.set(v)
}
func (jl *JSONLiteral) set(v any) error {
switch v := v.(type) {
case bool, string, float64, time.Time, int64:
jl.Value = v
case int:
jl.Value = int64(v)
default:
return ErrUnsupportedLiteralType
}
return nil
}