/
append.go
214 lines (188 loc) · 3.82 KB
/
append.go
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package types
import (
"database/sql/driver"
"encoding/hex"
"math"
"reflect"
"strconv"
"time"
)
func Append(b []byte, v interface{}, quote int) []byte {
switch v := v.(type) {
case nil:
return AppendNull(b, quote)
case bool:
return appendBool(b, v)
case int8:
return strconv.AppendInt(b, int64(v), 10)
case int16:
return strconv.AppendInt(b, int64(v), 10)
case int32:
return strconv.AppendInt(b, int64(v), 10)
case int64:
return strconv.AppendInt(b, int64(v), 10)
case int:
return strconv.AppendInt(b, int64(v), 10)
case uint8:
return strconv.AppendUint(b, uint64(v), 10)
case uint16:
return strconv.AppendUint(b, uint64(v), 10)
case uint32:
return strconv.AppendUint(b, uint64(v), 10)
case uint64:
return strconv.AppendUint(b, v, 10)
case uint:
return strconv.AppendUint(b, uint64(v), 10)
case float32:
return appendFloat(b, float64(v), quote)
case float64:
return appendFloat(b, v, quote)
case string:
return AppendString(b, v, quote)
case time.Time:
return AppendTime(b, v, quote)
case []byte:
return AppendBytes(b, v, quote)
case ValueAppender:
return appendAppender(b, v, quote)
case driver.Valuer:
return appendDriverValuer(b, v, quote)
default:
return appendValue(b, reflect.ValueOf(v), quote)
}
}
func AppendError(b []byte, err error) []byte {
b = append(b, "?!("...)
b = append(b, err.Error()...)
b = append(b, ')')
return b
}
func AppendNull(b []byte, quote int) []byte {
if quote == 1 {
return append(b, "NULL"...)
} else {
return nil
}
}
func appendBool(dst []byte, v bool) []byte {
if v {
return append(dst, "TRUE"...)
}
return append(dst, "FALSE"...)
}
func appendFloat(dst []byte, v float64, quote int) []byte {
switch {
case math.IsNaN(v):
if quote == 1 {
return append(dst, "'NaN'"...)
}
return append(dst, "NaN"...)
case math.IsInf(v, 1):
if quote == 1 {
return append(dst, "'Infinity'"...)
}
return append(dst, "Infinity"...)
case math.IsInf(v, -1):
if quote == 1 {
return append(dst, "'-Infinity'"...)
}
return append(dst, "-Infinity"...)
default:
return strconv.AppendFloat(dst, v, 'f', -1, 64)
}
}
func AppendString(b []byte, s string, quote int) []byte {
switch quote {
case 1:
b = append(b, '\'')
case 2:
b = append(b, '"')
}
for i := 0; i < len(s); i++ {
c := s[i]
if c == '\000' {
continue
}
if quote >= 1 {
if c == '\'' {
b = append(b, '\'', '\'')
continue
}
}
if quote == 2 {
switch c {
case '"':
b = append(b, '\\', '"')
case '\\':
b = append(b, '\\', '\\')
default:
b = append(b, c)
}
continue
}
b = append(b, c)
}
switch quote {
case 1:
b = append(b, '\'')
case 2:
b = append(b, '"')
}
return b
}
func AppendBytes(b []byte, bytes []byte, quote int) []byte {
if bytes == nil {
return AppendNull(b, quote)
}
switch quote {
case 1:
b = append(b, '\'')
case 2:
b = append(b, '"')
}
tmp := make([]byte, hex.EncodedLen(len(bytes)))
hex.Encode(tmp, bytes)
if quote == 2 {
b = append(b, '\\')
}
b = append(b, "\\x"...)
b = append(b, tmp...)
switch quote {
case 1:
b = append(b, '\'')
case 2:
b = append(b, '"')
}
return b
}
func AppendStringStringMap(b []byte, m map[string]string, quote int) []byte {
if m == nil {
return AppendNull(b, quote)
}
if quote == 1 {
b = append(b, '\'')
}
for key, value := range m {
b = AppendString(b, key, 2)
b = append(b, '=', '>')
b = AppendString(b, value, 2)
b = append(b, ',')
}
if len(m) > 0 {
b = b[:len(b)-1] // Strip trailing comma.
}
if quote == 1 {
b = append(b, '\'')
}
return b
}
func appendDriverValuer(b []byte, v driver.Valuer, quote int) []byte {
value, err := v.Value()
if err != nil {
return AppendError(b, err)
}
return Append(b, value, quote)
}
func appendAppender(b []byte, v ValueAppender, quote int) []byte {
return v.AppendValue(b, quote)
}