| 1 |
#include "EXTERN.h" |
| 2 |
#include "perl.h" |
| 3 |
#include "XSUB.h" |
| 4 |
|
| 5 |
/* pre-5.10 compatibility */ |
| 6 |
#ifndef GV_NOTQUAL |
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# define GV_NOTQUAL 1 |
| 8 |
#endif |
| 9 |
#ifndef gv_fetchpvs |
| 10 |
# define gv_fetchpvs gv_fetchpv |
| 11 |
#endif |
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|
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#include "multicall.h" |
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|
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/* workaround for buggy multicall API */ |
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#ifndef cxinc |
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# define cxinc() Perl_cxinc (aTHX) |
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#endif |
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|
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#define dCMP \ |
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dMULTICALL; \ |
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void *cmp_data; \ |
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I32 gimme = G_SCALAR; |
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|
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#define CMP_PUSH(sv) \ |
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PUSH_MULTICALL (cmp_push_ (sv));\ |
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cmp_data = multicall_cop; |
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|
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#define CMP_POP \ |
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POP_MULTICALL; |
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|
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#define dCMP_CALL(data) \ |
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OP *multicall_cop = (OP *)data; |
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|
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static void * |
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cmp_push_ (SV *sv) |
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{ |
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HV *st; |
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GV *gvp; |
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CV *cv; |
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|
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cv = sv_2cv (sv, &st, &gvp, 0); |
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|
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if (!cv) |
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croak ("%s: callback must be a CODE reference or another callable object", SvPV_nolen (sv)); |
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|
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if (!PL_firstgv) PL_firstgv = gv_fetchpvs ("a", GV_ADD | GV_NOTQUAL, SVt_PV); |
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if (!PL_secondgv) PL_secondgv = gv_fetchpvs ("b", GV_ADD | GV_NOTQUAL, SVt_PV); |
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|
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SAVESPTR (GvSV (PL_firstgv)); |
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SAVESPTR (GvSV (PL_secondgv)); |
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|
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return cv; |
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} |
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|
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/*****************************************************************************/ |
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|
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static SV * |
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sv_first (SV *sv) |
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{ |
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if (SvROK (sv) && SvTYPE (SvRV (sv)) == SVt_PVAV) |
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{ |
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AV *av = (AV *)SvRV (sv); |
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|
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sv = AvFILLp (av) < 0 ? &PL_sv_undef : AvARRAY (av)[0]; |
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} |
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|
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return sv; |
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} |
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|
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static int |
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cmp_nv (SV *a, SV *b, void *cmp_data) |
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{ |
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a = sv_first (a); |
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b = sv_first (b); |
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|
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return SvNV (a) > SvNV (b); |
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} |
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|
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static int |
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cmp_sv (SV *a, SV *b, void *cmp_data) |
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{ |
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a = sv_first (a); |
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b = sv_first (b); |
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|
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return sv_cmp (a, b) > 0; |
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} |
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|
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static int |
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cmp_custom (SV *a, SV *b, void *cmp_data) |
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{ |
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dCMP_CALL (cmp_data); |
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|
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GvSV (PL_firstgv) = a; |
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GvSV (PL_secondgv) = b; |
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|
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MULTICALL; |
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|
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if (SvTRUE (ERRSV)) |
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croak (NULL); |
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|
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{ |
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dSP; |
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return TOPi > 0; |
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} |
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} |
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|
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/*****************************************************************************/ |
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|
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typedef int (*f_cmp)(SV *a, SV *b, void *cmp_data); |
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|
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static AV * |
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array (SV *ref) |
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{ |
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if (SvROK (ref) |
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&& SvTYPE (SvRV (ref)) == SVt_PVAV |
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&& !SvTIED_mg (SvRV (ref), PERL_MAGIC_tied)) |
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return (AV *)SvRV (ref); |
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|
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croak ("argument 'heap' must be a (non-tied) array"); |
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} |
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|
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#define gt(a,b) cmp ((a), (b), cmp_data) |
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|
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/*****************************************************************************/ |
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|
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/* away from the root */ |
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static void |
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downheap (AV *av, f_cmp cmp, void *cmp_data, int N, int k) |
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{ |
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SV **heap = AvARRAY (av); |
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SV *he = heap [k]; |
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|
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for (;;) |
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{ |
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int c = (k << 1) + 1; |
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|
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if (c >= N) |
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break; |
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|
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c += c + 1 < N && gt (heap [c], heap [c + 1]) |
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? 1 : 0; |
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|
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if (!(gt (he, heap [c]))) |
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break; |
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|
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heap [k] = heap [c]; |
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|
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k = c; |
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} |
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|
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heap [k] = he; |
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} |
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|
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/* towards the root */ |
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static void |
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upheap (AV *av, f_cmp cmp, void *cmp_data, int k) |
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{ |
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SV **heap = AvARRAY (av); |
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SV *he = heap [k]; |
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|
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while (k) |
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{ |
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int p = (k - 1) >> 1; |
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|
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if (!(gt (heap [p], he))) |
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break; |
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|
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heap [k] = heap [p]; |
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k = p; |
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} |
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|
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heap [k] = he; |
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} |
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|
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/* move an element suitably so it is in a correct place */ |
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static void |
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adjustheap (AV *av, f_cmp cmp, void *cmp_data, int N, int k) |
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{ |
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SV **heap = AvARRAY (av); |
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|
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if (k > 0 && !gt (heap [k], heap [(k - 1) >> 1])) |
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upheap (av, cmp, cmp_data, k); |
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else |
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downheap (av, cmp, cmp_data, N, k); |
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} |
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|
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/*****************************************************************************/ |
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|
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static void |
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make_heap (AV *av, f_cmp cmp, void *cmp_data) |
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{ |
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int i, len = AvFILLp (av); |
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|
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/* do not use floyds algorithm, as I expect the simpler and more cache-efficient */ |
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/* upheap is actually faster */ |
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for (i = 0; i <= len; ++i) |
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upheap (av, cmp, cmp_data, i); |
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} |
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|
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static void |
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push_heap (AV *av, f_cmp cmp, void *cmp_data, SV *elem) |
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{ |
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av_push (av, newSVsv (elem)); |
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upheap (av, cmp, cmp_data, AvFILLp (av)); |
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} |
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|
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static SV * |
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pop_heap (AV *av, f_cmp cmp, void *cmp_data) |
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{ |
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int len = AvFILLp (av); |
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|
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if (len < 0) |
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return &PL_sv_undef; |
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else if (len == 0) |
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return av_pop (av); |
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else |
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{ |
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SV *top = av_pop (av); |
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SV *result = AvARRAY (av)[0]; |
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AvARRAY (av)[0] = top; |
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downheap (av, cmp, cmp_data, len, 0); |
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return result; |
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} |
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} |
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|
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static SV * |
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splice_heap (AV *av, f_cmp cmp, void *cmp_data, int idx) |
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{ |
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int len = AvFILLp (av); |
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|
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if (len < 0 || idx > len) |
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return &PL_sv_undef; |
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else if (len == 0 || idx == len) |
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return av_pop (av); /* the only or last element */ |
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else |
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{ |
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SV *top = av_pop (av); |
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SV *result = AvARRAY (av)[idx]; |
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AvARRAY (av)[idx] = top; |
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adjustheap (av, cmp, cmp_data, len, idx); |
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return result; |
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} |
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} |
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|
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static void |
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adjust_heap (AV *av, f_cmp cmp, void *cmp_data, int idx) |
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{ |
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adjustheap (av, cmp, cmp_data, AvFILLp (av) + 1, idx); |
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} |
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|
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MODULE = Array::Heap PACKAGE = Array::Heap |
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|
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void |
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make_heap (SV *heap) |
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PROTOTYPE: \@ |
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CODE: |
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make_heap (array (heap), cmp_nv, 0); |
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|
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void |
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make_heap_lex (SV *heap) |
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PROTOTYPE: \@ |
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CODE: |
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make_heap (array (heap), cmp_sv, 0); |
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|
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void |
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make_heap_cmp (SV *cmp, SV *heap) |
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PROTOTYPE: &\@ |
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CODE: |
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{ |
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dCMP; |
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CMP_PUSH (cmp); |
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make_heap (array (heap), cmp_custom, cmp_data); |
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CMP_POP; |
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} |
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|
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void |
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push_heap (SV *heap, ...) |
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PROTOTYPE: \@@ |
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CODE: |
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{ |
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int i; |
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for (i = 1; i < items; i++) |
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push_heap (array (heap), cmp_nv, 0, ST(i)); |
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} |
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|
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void |
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push_heap_lex (SV *heap, ...) |
| 289 |
PROTOTYPE: \@@ |
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CODE: |
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{ |
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int i; |
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for (i = 1; i < items; i++) |
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push_heap (array (heap), cmp_sv, 0, ST(i)); |
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} |
| 296 |
|
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void |
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push_heap_cmp (SV *cmp, SV *heap, ...) |
| 299 |
PROTOTYPE: &\@@ |
| 300 |
CODE: |
| 301 |
{ |
| 302 |
int i; |
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dCMP; |
| 304 |
|
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CMP_PUSH (cmp); |
| 306 |
for (i = 2; i < items; i++) |
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push_heap (array (heap), cmp_custom, cmp_data, ST(i)); |
| 308 |
CMP_POP; |
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} |
| 310 |
|
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SV * |
| 312 |
pop_heap (SV *heap) |
| 313 |
PROTOTYPE: \@ |
| 314 |
CODE: |
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RETVAL = pop_heap (array (heap), cmp_nv, 0); |
| 316 |
OUTPUT: |
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RETVAL |
| 318 |
|
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SV * |
| 320 |
pop_heap_lex (SV *heap) |
| 321 |
PROTOTYPE: \@ |
| 322 |
CODE: |
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RETVAL = pop_heap (array (heap), cmp_sv, 0); |
| 324 |
OUTPUT: |
| 325 |
RETVAL |
| 326 |
|
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SV * |
| 328 |
pop_heap_cmp (SV *cmp, SV *heap) |
| 329 |
PROTOTYPE: &\@ |
| 330 |
CODE: |
| 331 |
{ |
| 332 |
dCMP; |
| 333 |
CMP_PUSH (cmp); |
| 334 |
RETVAL = pop_heap (array (heap), cmp_custom, cmp_data); |
| 335 |
CMP_POP; |
| 336 |
} |
| 337 |
OUTPUT: |
| 338 |
RETVAL |
| 339 |
|
| 340 |
SV * |
| 341 |
splice_heap (SV *heap, int idx) |
| 342 |
PROTOTYPE: \@$ |
| 343 |
CODE: |
| 344 |
RETVAL = splice_heap (array (heap), cmp_nv, 0, idx); |
| 345 |
OUTPUT: |
| 346 |
RETVAL |
| 347 |
|
| 348 |
SV * |
| 349 |
splice_heap_lex (SV *heap, int idx) |
| 350 |
PROTOTYPE: \@$ |
| 351 |
CODE: |
| 352 |
RETVAL = splice_heap (array (heap), cmp_sv, 0, idx); |
| 353 |
OUTPUT: |
| 354 |
RETVAL |
| 355 |
|
| 356 |
SV * |
| 357 |
splice_heap_cmp (SV *cmp, SV *heap, int idx) |
| 358 |
PROTOTYPE: &\@$ |
| 359 |
CODE: |
| 360 |
{ |
| 361 |
dCMP; |
| 362 |
CMP_PUSH (cmp); |
| 363 |
RETVAL = splice_heap (array (heap), cmp_custom, cmp_data, idx); |
| 364 |
CMP_POP; |
| 365 |
} |
| 366 |
OUTPUT: |
| 367 |
RETVAL |
| 368 |
|
| 369 |
void |
| 370 |
adjust_heap (SV *heap, int idx) |
| 371 |
PROTOTYPE: \@$ |
| 372 |
CODE: |
| 373 |
adjust_heap (array (heap), cmp_nv, 0, idx); |
| 374 |
|
| 375 |
void |
| 376 |
adjust_heap_lex (SV *heap, int idx) |
| 377 |
PROTOTYPE: \@$ |
| 378 |
CODE: |
| 379 |
adjust_heap (array (heap), cmp_sv, 0, idx); |
| 380 |
|
| 381 |
void |
| 382 |
adjust_heap_cmp (SV *cmp, SV *heap, int idx) |
| 383 |
PROTOTYPE: &\@$ |
| 384 |
CODE: |
| 385 |
{ |
| 386 |
dCMP; |
| 387 |
CMP_PUSH (cmp); |
| 388 |
adjust_heap (array (heap), cmp_custom, cmp_data, idx); |
| 389 |
CMP_POP; |
| 390 |
} |
| 391 |
|
