Commit | Line | Data |
---|---|---|
d812d165 | 1 | /* inline_invlist.c |
81e983c1 KW |
2 | * |
3 | * Copyright (C) 2012 by Larry Wall and others | |
4 | * | |
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. | |
81e983c1 KW |
7 | */ |
8 | ||
9 | #if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_REGEXEC_C) | |
10 | ||
9e7f4f43 KW |
11 | #define INVLIST_LEN_OFFSET 0 /* Number of elements in the inversion list */ |
12 | #define INVLIST_ITER_OFFSET 1 /* Current iteration position */ | |
15896d2f KW |
13 | #define INVLIST_PREVIOUS_INDEX_OFFSET 2 /* Place to cache index of previous |
14 | result */ | |
9e7f4f43 KW |
15 | |
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 */ | |
15896d2f KW |
22 | #define INVLIST_VERSION_ID_OFFSET 3 |
23 | #define INVLIST_VERSION_ID 290655244 | |
9e7f4f43 KW |
24 | |
25 | /* For safety, when adding new elements, remember to #undef them at the end of | |
26 | * the inversion list code section */ | |
27 | ||
15896d2f | 28 | #define INVLIST_ZERO_OFFSET 4 /* 0 or 1; must be last element in header */ |
9e7f4f43 KW |
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 | |
34 | * very fast */ | |
35 | ||
36 | #define HEADER_LENGTH (INVLIST_ZERO_OFFSET + 1) | |
37 | ||
38 | /* An element is in an inversion list iff its index is even numbered: 0, 2, 4, | |
39 | * etc */ | |
40 | #define ELEMENT_RANGE_MATCHES_INVLIST(i) (! ((i) & 1)) | |
41 | #define PREV_RANGE_MATCHES_INVLIST(i) (! ELEMENT_RANGE_MATCHES_INVLIST(i)) | |
42 | ||
43 | PERL_STATIC_INLINE UV* | |
44 | S__get_invlist_len_addr(pTHX_ SV* invlist) | |
45 | { | |
46 | /* Return the address of the UV that contains the current number | |
47 | * of used elements in the inversion list */ | |
48 | ||
49 | PERL_ARGS_ASSERT__GET_INVLIST_LEN_ADDR; | |
50 | ||
51 | return (UV *) (SvPVX(invlist) + (INVLIST_LEN_OFFSET * sizeof (UV))); | |
52 | } | |
53 | ||
54 | PERL_STATIC_INLINE UV | |
55 | S__invlist_len(pTHX_ SV* const invlist) | |
56 | { | |
57 | /* Returns the current number of elements stored in the inversion list's | |
58 | * array */ | |
59 | ||
60 | PERL_ARGS_ASSERT__INVLIST_LEN; | |
61 | ||
62 | return *_get_invlist_len_addr(invlist); | |
63 | } | |
64 | ||
65 | PERL_STATIC_INLINE bool | |
66 | S__invlist_contains_cp(pTHX_ SV* const invlist, const UV cp) | |
67 | { | |
68 | /* Does <invlist> contain code point <cp> as part of the set? */ | |
69 | ||
70 | IV index = _invlist_search(invlist, cp); | |
71 | ||
72 | PERL_ARGS_ASSERT__INVLIST_CONTAINS_CP; | |
73 | ||
74 | return index >= 0 && ELEMENT_RANGE_MATCHES_INVLIST(index); | |
75 | } | |
76 | ||
81e983c1 | 77 | #endif |