Class: String

Inherits:
Object
  • Object
show all
Defined in:
(unknown)

Instance Method Summary collapse

Instance Method Details

#unicode_sort_key ⇒ Object

string.unicode_sort_key -> string

Returns a string that will sort according to the Unicode collation algorithm.



14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
 
# File 'ext/unicode_collation.c', line 14

static VALUE unicode_sort_key(VALUE string) {
  char str[BUF_SIZE];
  UChar ustr[BUF_SIZE];
  int32_t len  = 0;
  int32_t ulen = 0;
  UErrorCode status = U_ZERO_ERROR; 
  UCollator *col;

  string = StringValue(string);
  u_strFromUTF8(ustr, BUF_SIZE, &ulen, RSTRING_PTR(string), RSTRING_LEN(string), &status);
  if (status == U_INVALID_CHAR_FOUND) {
    return Qnil;
  }

  col = ucol_open("en_US", &status); 
  if (U_SUCCESS(status)) {
    len = ucol_getSortKey(col, ustr, ulen, (uint8_t*)str, BUF_SIZE);
    ucol_close(col);
  }    
  if (len == 0) {
    return Qnil;
  }

  return rb_str_new(str, len - 1);
}