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package pgdialect
import (
"database/sql/driver"
"encoding/hex"
"fmt"
"strconv"
"time"
"unicode/utf8"
"github.com/uptrace/bun/dialect"
)
func appendElem(buf []byte, val interface{}) []byte {
switch val := val.(type) {
case int64:
return strconv.AppendInt(buf, val, 10)
case float64:
return arrayAppendFloat64(buf, val)
case bool:
return dialect.AppendBool(buf, val)
case []byte:
return appendBytesElem(buf, val)
case string:
return appendStringElem(buf, val)
case time.Time:
buf = append(buf, '"')
buf = appendTime(buf, val)
buf = append(buf, '"')
return buf
case driver.Valuer:
val2, err := val.Value()
if err != nil {
err := fmt.Errorf("pgdialect: can't append elem value: %w", err)
return dialect.AppendError(buf, err)
}
return appendElem(buf, val2)
default:
err := fmt.Errorf("pgdialect: can't append elem %T", val)
return dialect.AppendError(buf, err)
}
}
func appendBytesElem(b []byte, bs []byte) []byte {
if bs == nil {
return dialect.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 appendStringElem(b []byte, s string) []byte {
b = append(b, '"')
for _, r := range s {
switch r {
case 0:
// ignore
case '\'':
b = append(b, "''"...)
case '"':
b = append(b, '\\', '"')
case '\\':
b = append(b, '\\', '\\')
default:
if r < utf8.RuneSelf {
b = append(b, byte(r))
break
}
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
}
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