gotosocial/vendor/github.com/uptrace/bun/dialect/append.go
2021-10-24 13:14:37 +02:00

134 lines
2.3 KiB
Go

package dialect
import (
"encoding/hex"
"math"
"strconv"
"unicode/utf8"
"github.com/uptrace/bun/internal"
)
func AppendError(b []byte, err error) []byte {
b = append(b, "?!("...)
b = append(b, err.Error()...)
b = append(b, ')')
return b
}
func AppendNull(b []byte) []byte {
return append(b, "NULL"...)
}
func AppendBool(b []byte, v bool) []byte {
if v {
return append(b, "TRUE"...)
}
return append(b, "FALSE"...)
}
func AppendFloat32(b []byte, v float32) []byte {
return appendFloat(b, float64(v), 32)
}
func AppendFloat64(b []byte, v float64) []byte {
return appendFloat(b, v, 64)
}
func appendFloat(b []byte, v float64, bitSize int) []byte {
switch {
case math.IsNaN(v):
return append(b, "'NaN'"...)
case math.IsInf(v, 1):
return append(b, "'Infinity'"...)
case math.IsInf(v, -1):
return append(b, "'-Infinity'"...)
default:
return strconv.AppendFloat(b, v, 'f', -1, bitSize)
}
}
func AppendString(b []byte, s string) []byte {
b = append(b, '\'')
for _, r := range s {
if r == '\000' {
continue
}
if r == '\'' {
b = append(b, '\'', '\'')
continue
}
if r < utf8.RuneSelf {
b = append(b, byte(r))
continue
}
l := len(b)
if cap(b)-l < utf8.UTFMax {
b = append(b, make([]byte, utf8.UTFMax)...)
}
n := utf8.EncodeRune(b[l:l+utf8.UTFMax], r)
b = b[:l+n]
}
b = append(b, '\'')
return b
}
func AppendBytes(b, bs []byte) []byte {
if bs == nil {
return AppendNull(b)
}
b = append(b, `'\x`...)
s := len(b)
b = append(b, make([]byte, hex.EncodedLen(len(bs)))...)
hex.Encode(b[s:], bs)
b = append(b, '\'')
return b
}
//------------------------------------------------------------------------------
func AppendIdent(b []byte, field string, quote byte) []byte {
return appendIdent(b, internal.Bytes(field), quote)
}
func appendIdent(b, src []byte, quote byte) []byte {
var quoted bool
loop:
for _, c := range src {
switch c {
case '*':
if !quoted {
b = append(b, '*')
continue loop
}
case '.':
if quoted {
b = append(b, quote)
quoted = false
}
b = append(b, '.')
continue loop
}
if !quoted {
b = append(b, quote)
quoted = true
}
if c == quote {
b = append(b, quote, quote)
} else {
b = append(b, c)
}
}
if quoted {
b = append(b, quote)
}
return b
}