This is 0.03

[perl/modules/Scope-Upper.git] / Upper.xs

diff --git a/Upper.xs b/Upper.xs
index e54e42cda5767985ed2bd9a2942dd3dd87bdf326..0235cbee67610a06e354d7cd40611d0e6a0f8d4e 100644 (file)
--- a/Upper.xs
+++ b/Upper.xs
@@ -54,6 +54,10 @@
 # define PERL_MAGIC_env 'E'
 #endif
 
+#ifndef NEGATIVE_INDICES_VAR
+# define NEGATIVE_INDICES_VAR "NEGATIVE_INDICES"
+#endif
+
 #define SU_HAS_PERL(R, V, S) (PERL_REVISION > (R) || (PERL_REVISION == (R) && (PERL_VERSION > (V) || (PERL_VERSION == (V) && (PERL_SUBVERSION >= (S))))))
 
 /* --- Stack manipulations ------------------------------------------------- */
@@ -71,41 +75,58 @@
 
 /* ... Saving array elements ............................................... */
 
-STATIC I32 su_av_preeminent(pTHX_ AV *av, I32 key) {
-#define su_av_preeminent(A, K) su_av_preeminent(aTHX_ (A), (K))
- MAGIC *mg;
- HV *stash;
+STATIC I32 su_av_key2idx(pTHX_ AV *av, I32 key) {
+#define su_av_key2idx(A, K) su_av_key2idx(aTHX_ (A), (K))
+ I32 idx;
 
- if (!av) return 0;
- if (SvCANEXISTDELETE(av))
-  return av_exists(av, key);
+ if (key >= 0)
+  return key;
+
+/* Added by MJD in perl-5.8.1 with 6f12eb6d2a1dfaf441504d869b27d2e40ef4966a */
+#if SU_HAS_PERL(5, 8, 1)
+ if (SvRMAGICAL(av)) {
+  const MAGIC * const tied_magic = mg_find((SV *) av, PERL_MAGIC_tied);
+  if (tied_magic) {
+   int adjust_index = 1;
+   SV * const * const negative_indices_glob =
+                    hv_fetch(SvSTASH(SvRV(SvTIED_obj((SV *) (av), tied_magic))),
+                             NEGATIVE_INDICES_VAR, 16, 0);
+   if (negative_indices_glob && SvTRUE(GvSV(*negative_indices_glob)))
+    return key;
+  }
+ }
+#endif
 
- return 1;
+ idx = key + av_len(av) + 1;
+ if (idx < 0)
+  return key;
+
+ return idx;
 }
 
 #ifndef SAVEADELETE
 
 typedef struct {
  AV *av;
- I32 key;
+ I32 idx;
 } su_ud_adelete;
 
 STATIC void su_adelete(pTHX_ void *ud_) {
  su_ud_adelete *ud = ud_;
 
- av_delete(ud->av, ud->key, G_DISCARD);
+ av_delete(ud->av, ud->idx, G_DISCARD);
  SvREFCNT_dec(ud->av);
 
  Safefree(ud);
 }
 
-STATIC void su_save_adelete(pTHX_ AV *av, I32 key) {
+STATIC void su_save_adelete(pTHX_ AV *av, I32 idx) {
 #define su_save_adelete(A, K) su_save_adelete(aTHX_ (A), (K))
  su_ud_adelete *ud;
 
  Newx(ud, 1, su_ud_adelete);
  ud->av  = av;
- ud->key = key;
+ ud->idx = idx;
  SvREFCNT_inc(av);
 
  SAVEDESTRUCTOR_X(su_adelete, ud);
@@ -118,13 +139,18 @@ STATIC void su_save_adelete(pTHX_ AV *av, I32 key) {
 STATIC void su_save_aelem(pTHX_ AV *av, SV *key, SV *val) {
 #define su_save_aelem(A, K, V) su_save_aelem(aTHX_ (A), (K), (V))
  I32 idx;
- I32 preeminent;
+ I32 preeminent = 1;
  SV **svp;
+ HV *stash;
+ MAGIC *mg;
+
+ idx = su_av_key2idx(av, SvIV(key));
+
+ if (SvCANEXISTDELETE(av))
+  preeminent = av_exists(av, idx);
 
- idx = SvIV(key);
- preeminent = su_av_preeminent(av, idx);
  svp = av_fetch(av, idx, 1);
- if (!*svp || *svp == &PL_sv_undef) croak(PL_no_aelem, idx);
+ if (!svp || *svp == &PL_sv_undef) croak(PL_no_aelem, idx);
 
  if (preeminent)
   save_aelem(av, idx, svp);
@@ -140,25 +166,17 @@ STATIC void su_save_aelem(pTHX_ AV *av, SV *key, SV *val) {
 
 /* ... Saving hash elements ................................................ */
 
-STATIC I32 su_hv_preeminent(pTHX_ HV *hv, SV *keysv) {
-#define su_hv_preeminent(H, K) su_hv_preeminent(aTHX_ (H), (K))
- MAGIC *mg;
- HV *stash;
-
- if (!hv) return 0;
- if (SvCANEXISTDELETE(hv) || mg_find((SV *) hv, PERL_MAGIC_env))
-  return hv_exists_ent(hv, keysv, 0);
-
- return 1;
-}
-
 STATIC void su_save_helem(pTHX_ HV *hv, SV *keysv, SV *val) {
 #define su_save_helem(H, K, V) su_save_helem(aTHX_ (H), (K), (V))
- I32 preeminent;
+ I32 preeminent = 1;
  HE *he;
  SV **svp;
+ HV *stash;
+ MAGIC *mg;
+
+ if (SvCANEXISTDELETE(hv) || mg_find((SV *) hv, PERL_MAGIC_env))
+  preeminent = hv_exists_ent(hv, keysv, 0);
 
- preeminent = su_hv_preeminent(hv, keysv);
  he  = hv_fetch_ent(hv, keysv, 1, 0);
  svp = he ? &HeVAL(he) : NULL;
  if (!svp || *svp == &PL_sv_undef) croak("Modification of non-creatable hash value attempted, subscript \"%s\"", SvPV_nolen_const(*svp));
@@ -332,16 +350,14 @@ STATIC void su_localize(pTHX_ void *ud_) {
  switch (t) {
   case SVt_PVAV:
    if (elem) {
-    AV *av = GvAV(gv);
-    su_save_aelem(av, elem, val);
+    su_save_aelem(GvAV(gv), elem, val);
     goto done;
    } else
     save_ary(gv);
    break;
   case SVt_PVHV:
    if (elem) {
-    HV *hv = GvHV(gv);
-    su_save_helem(hv, elem, val);
+    su_save_helem(GvHV(gv), elem, val);
     goto done;
    } else
     save_hash(gv);