3 * Copyright (C) 2012 by Larry Wall and others
5 * You may distribute under the terms of either the GNU General Public
6 * License or the Artistic License, as specified in the README file.
9 #if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_REGEXEC_C)
11 #define INVLIST_LEN_OFFSET 0 /* Number of elements in the inversion list */
12 #define INVLIST_ITER_OFFSET 1 /* Current iteration position */
13 #define INVLIST_PREVIOUS_INDEX_OFFSET 2 /* Place to cache index of previous
16 /* This is a combination of a version and data structure type, so that one
17 * being passed in can be validated to be an inversion list of the correct
18 * vintage. When the structure of the header is changed, a new random number
19 * in the range 2**31-1 should be generated and the new() method changed to
20 * insert that at this location. Then, if an auxiliary program doesn't change
21 * correspondingly, it will be discovered immediately */
22 #define INVLIST_VERSION_ID_OFFSET 3
23 #define INVLIST_VERSION_ID 290655244
25 /* For safety, when adding new elements, remember to #undef them at the end of
26 * the inversion list code section */
28 #define INVLIST_ZERO_OFFSET 4 /* 0 or 1; must be last element in header */
29 /* The UV at position ZERO contains either 0 or 1. If 0, the inversion list
30 * contains the code point U+00000, and begins here. If 1, the inversion list
31 * doesn't contain U+0000, and it begins at the next UV in the array.
32 * Inverting an inversion list consists of adding or removing the 0 at the
33 * beginning of it. By reserving a space for that 0, inversion can be made
36 #define HEADER_LENGTH (INVLIST_ZERO_OFFSET + 1)
38 /* An element is in an inversion list iff its index is even numbered: 0, 2, 4,
40 #define ELEMENT_RANGE_MATCHES_INVLIST(i) (! ((i) & 1))
41 #define PREV_RANGE_MATCHES_INVLIST(i) (! ELEMENT_RANGE_MATCHES_INVLIST(i))
43 PERL_STATIC_INLINE UV*
44 S__get_invlist_len_addr(pTHX_ SV* invlist)
46 /* Return the address of the UV that contains the current number
47 * of used elements in the inversion list */
49 PERL_ARGS_ASSERT__GET_INVLIST_LEN_ADDR;
51 return (UV *) (SvPVX(invlist) + (INVLIST_LEN_OFFSET * sizeof (UV)));
55 S__invlist_len(pTHX_ SV* const invlist)
57 /* Returns the current number of elements stored in the inversion list's
60 PERL_ARGS_ASSERT__INVLIST_LEN;
62 return *_get_invlist_len_addr(invlist);
65 PERL_STATIC_INLINE bool
66 S__invlist_contains_cp(pTHX_ SV* const invlist, const UV cp)
68 /* Does <invlist> contain code point <cp> as part of the set? */
70 IV index = _invlist_search(invlist, cp);
72 PERL_ARGS_ASSERT__INVLIST_CONTAINS_CP;
74 return index >= 0 && ELEMENT_RANGE_MATCHES_INVLIST(index);