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/* inline_invlist.c
*
* Copyright (C) 2012 by Larry Wall and others
*
* You may distribute under the terms of either the GNU General Public
* License or the Artistic License, as specified in the README file.
*/
#if defined(PERL_IN_UTF8_C) || defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_REGEXEC_C)
#define INVLIST_LEN_OFFSET 0 /* Number of elements in the inversion list */
/* This is a combination of a version and data structure type, so that one
* being passed in can be validated to be an inversion list of the correct
* vintage. When the structure of the header is changed, a new random number
* in the range 2**31-1 should be generated. Then, if an auxiliary program
* doesn't change correspondingly, it will be discovered immediately */
#define INVLIST_VERSION_ID_OFFSET 1
#define INVLIST_VERSION_ID 1511554547
#define INVLIST_OFFSET_OFFSET 2 /* 0 or 1 */
/* The UV at this position contains either 0 or 1. If 0, the inversion list
* contains the code point U+00000, and begins at element [0] in the array,
* which always contains 0. If 1, the inversion list doesn't contain U+0000,
* and it begins at element [1]. Inverting an inversion list consists of
* adding or removing the 0 at the beginning of it. By reserving a space for
* that 0, inversion can be made very fast: we just flip this UV */
/* For safety, when adding new elements, remember to #undef them at the end of
* the inversion list code section */
#define HEADER_LENGTH (INVLIST_OFFSET_OFFSET + 2) /* includes 1 for the constant
0 element */
/* An element is in an inversion list iff its index is even numbered: 0, 2, 4,
* etc */
#define ELEMENT_RANGE_MATCHES_INVLIST(i) (! ((i) & 1))
#define PREV_RANGE_MATCHES_INVLIST(i) (! ELEMENT_RANGE_MATCHES_INVLIST(i))
PERL_STATIC_INLINE STRLEN*
S__get_invlist_len_addr(pTHX_ SV* invlist)
{
/* Return the address of the UV that contains the current number
* of used elements in the inversion list */
PERL_ARGS_ASSERT__GET_INVLIST_LEN_ADDR;
return &(LvTARGLEN(invlist));
}
PERL_STATIC_INLINE UV
S__invlist_len(pTHX_ SV* const invlist)
{
/* Returns the current number of elements stored in the inversion list's
* array */
PERL_ARGS_ASSERT__INVLIST_LEN;
return *_get_invlist_len_addr(invlist);
}
PERL_STATIC_INLINE bool
S__invlist_contains_cp(pTHX_ SV* const invlist, const UV cp)
{
/* Does <invlist> contain code point <cp> as part of the set? */
IV index = _invlist_search(invlist, cp);
PERL_ARGS_ASSERT__INVLIST_CONTAINS_CP;
return index >= 0 && ELEMENT_RANGE_MATCHES_INVLIST(index);
}
#endif
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