tidb locale_format 源码
tidb locale_format 代码
文件路径：/parser/mysql/locale_format.go
package mysql
import (
"bytes"
"strconv"
"strings"
"unicode"
"github.com/pingcap/errors"
)
func formatENUS(number string, precision string) (string, error) {
var buffer bytes.Buffer
if unicode.IsDigit(rune(precision[0])) {
for i, v := range precision {
if unicode.IsDigit(v) {
continue
}
precision = precision[:i]
break
}
} else {
precision = "0"
}
if number[0] == '-' && number[1] == '.' {
number = strings.Replace(number, "-", "-0", 1)
} else if number[0] == '.' {
number = strings.Replace(number, ".", "0.", 1)
}
if (number[:1] == "-" && !unicode.IsDigit(rune(number[1]))) ||
(!unicode.IsDigit(rune(number[0])) && number[:1] != "-") {
buffer.Write([]byte{'0'})
position, err := strconv.ParseUint(precision, 10, 64)
if err == nil && position > 0 {
buffer.Write([]byte{'.'})
buffer.WriteString(strings.Repeat("0", int(position)))
}
return buffer.String(), nil
} else if number[:1] == "-" {
buffer.Write([]byte{'-'})
number = number[1:]
}
for i, v := range number {
if unicode.IsDigit(v) {
continue
} else if i == 1 && number[1] == '.' {
continue
} else if v == '.' && number[1] != '.' {
continue
} else {
number = number[:i]
break
}
}
comma := []byte{','}
parts := strings.Split(number, ".")
pos := 0
if len(parts[0])%3 != 0 {
pos += len(parts[0]) % 3
buffer.WriteString(parts[0][:pos])
buffer.Write(comma)
}
for ; pos < len(parts[0]); pos += 3 {
buffer.WriteString(parts[0][pos : pos+3])
buffer.Write(comma)
}
buffer.Truncate(buffer.Len() - 1)
position, err := strconv.ParseUint(precision, 10, 64)
if err == nil {
if position > 0 {
buffer.Write([]byte{'.'})
if len(parts) == 2 {
if uint64(len(parts[1])) >= position {
buffer.WriteString(parts[1][:position])
} else {
buffer.WriteString(parts[1])
buffer.WriteString(strings.Repeat("0", int(position)-len(parts[1])))
}
} else {
buffer.WriteString(strings.Repeat("0", int(position)))
}
}
}
return buffer.String(), nil
}
func formatZHCN(_ string, _ string) (string, error) {
return "", errors.New("not implemented")
}
func formatNotSupport(_ string, _ string) (string, error) {
return "", errors.New("not support for the specific locale")
}
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