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Implement natural-sort spaceship operator

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This commit is contained in:
Robin Gareus 2021-10-08 01:43:29 +02:00
parent 97f323137c
commit ba2a2cb654
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 19 additions and 10 deletions
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29
libs/pbd/pbd/natsort.h
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@ -114,8 +114,8 @@ numerically_less (const char* a, const char* b)
return false; // equal
}
inline bool
naturally_less (const char* a, const char* b)
inline int
natcmp (const char* a, const char* b)
{
const char* d_a = NULL;
const char* d_b = NULL;
@ -129,7 +129,7 @@ naturally_less (const char* a, const char* b)
const int ia = atoi (d_a);
const int ib = atoi (d_b);
if (ia != ib) {
return ia < ib;
return ia < ib ? -1 : 1;
}
}
d_a = d_b = NULL;
@ -146,25 +146,34 @@ naturally_less (const char* a, const char* b)
continue;
}
if (*a == '_') {
return ' ' < *b;
return ' ' < *b ? -1 : 1;
} else if (*b == '_') {
return *a < ' ';
return *a < ' ' ? -1 : 1;
} else
#endif
return *a < *b;
return *a < *b ? -1 : 1;
}
if (d_a) {
return atoi (d_a) < atoi (d_b);
const int ia = atoi (d_a);
const int ib = atoi (d_b);
if (ia != ib) {
return ia < ib ? -1 : 1;
}
}
/* if we reach here, either strings are same length and equal
* or one is longer than the other.
*/
if (*a) { return 1; }
if (*b) { return -1; }
return 0;
}
if (*a) { return false; }
if (*b) { return true; }
return false; // equal
inline bool
naturally_less (const char* a, const char* b)
{
return natcmp (a, b) < 0;
}
} // namespace PBD