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 }