45 lines
1.1 KiB
Go
45 lines
1.1 KiB
Go
// Copyright (C) 2017 ScyllaDB
|
|
// Use of this source code is governed by a ALv2-style
|
|
// license that can be found in the LICENSE file.
|
|
|
|
package gocqlx
|
|
|
|
import (
|
|
"fmt"
|
|
"unicode"
|
|
|
|
"github.com/jmoiron/sqlx/reflectx"
|
|
)
|
|
|
|
// DefaultMapper uses `db` tag and automatically converts struct field names to
|
|
// snake case. It can be set to whatever you want, but it is encouraged to be
|
|
// set before gocqlx is used as name-to-field mappings are cached after first
|
|
// use on a type.
|
|
var DefaultMapper = reflectx.NewMapperFunc("db", snakeCase)
|
|
|
|
// snakeCase converts camel case to snake case.
|
|
func snakeCase(s string) string {
|
|
buf := []byte(s)
|
|
out := make([]byte, 0, len(buf)+3)
|
|
|
|
l := len(buf)
|
|
for i := 0; i < l; i++ {
|
|
if !(allowedBindRune(buf[i]) || buf[i] == '_') {
|
|
panic(fmt.Sprint("not allowed name ", s))
|
|
}
|
|
|
|
b := rune(buf[i])
|
|
|
|
if unicode.IsUpper(b) {
|
|
if i > 0 && buf[i-1] != '_' && (unicode.IsLower(rune(buf[i-1])) || (i+1 < l && unicode.IsLower(rune(buf[i+1])))) {
|
|
out = append(out, '_')
|
|
}
|
|
b = unicode.ToLower(b)
|
|
}
|
|
|
|
out = append(out, byte(b))
|
|
}
|
|
|
|
return string(out)
|
|
}
|