muonsoft / validation

import "errors"

var (

	ErrTooShort          = errors.New("too short")

	ErrTooLong           = errors.New("too long")

	ErrTooLarge          = errors.New("too large")

	ErrInvalidCharacters = errors.New("invalid characters")

)

var ulidChars = newCharSet("0123456789ABCDEFGHJKMNPQRSTVWXYZabcdefghjkmnpqrstvwxyz")

// ULID validates whether the value is a valid ULID (Universally Unique Lexicographically Sortable Identifier).

// See https://github.com/ulid/spec for ULID specifications.

//

// Possible errors:

//   - [ErrTooShort] on values with length less than 26;

//   - [ErrTooLong] on values with length greater than 26;

//   - [ErrInvalidCharacters] on values with unexpected characters;

//   - [ErrTooLarge] on too big value (larger than '7ZZZZZZZZZZZZZZZZZZZZZZZZZ').

type charSet map[rune]struct{}

func (s charSet) Contains(c rune) bool {

	_, exist := s[c]

	return exist

}

func newCharSet(s string) charSet {

	chars := make(charSet, len(s))

	for _, c := range s {

		chars[c] = struct{}{}

	}

	return chars

}