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MLEHMANN / Gtk-Perl-0.7010 / Gtk / Derived.c 

            

              
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#include "EXTERN.h"
#include "perl.h"
#include "XSUB.h"
/* The contents of this file are directly derived from universal.c in
   Perl 5.005, and are specifically under Perl's copyright. */
#if defined(LAZY_LOAD) || defined(NEED_DERIVED)
#include "ppport.h"
/*
 * Contributed by Graham Barr  <Graham.Barr@tiuk.ti.com>
 * The main guts of traverse_isa was actually copied from gv_fetchmeth
 */
static SV *
isa_lookup(HV *stash, char *name, int len, int level)
{
    AV* av;
    GV* gv;
    GV** gvp;
    HV* hv = Nullhv;
    if (!stash)
        return &PL_sv_undef;
    if(strEQ(HvNAME(stash), name))
        return &PL_sv_yes;
    if (level > 100)
        croak("Recursive inheritance detected in package '%s'", HvNAME(stash));
    gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, FALSE);
    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (hv = GvHV(gv))) {
        SV* sv;
        SV** svp = (SV**)hv_fetch(hv, name, len, FALSE);
        if (svp && (sv = *svp) != (SV*)&PL_sv_undef)
            return sv;
    }
    gvp = (GV**)hv_fetch(stash,"ISA",3,FALSE);
     
    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
        if(!hv) {
            gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
            gv = *gvp;
            if (SvTYPE(gv) != SVt_PVGV)
                gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
            hv = GvHVn(gv);
        }
        if(hv) {
            SV** svp = AvARRAY(av);
            /* NOTE: No support for tied ISA */
            I32 items = av_len(av) + 1;
            while (items--) {
                SV* sv = *svp++;
                HV* basestash = gv_stashsv(sv, FALSE);
                if (!basestash) {
                    /*dTHR;
                    if (ckWARN(WARN_MISC))
                        warner(WARN_SYNTAX,
                             "Can't locate package %s for @%s::ISA",
                            SvPVX(sv), HvNAME(stash));*/
                        warn("Can't locate package %s for @%s::ISA",
                            SvPVX(sv), HvNAME(stash));
                             
                    continue;
                }
                if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
                    (void)hv_store(hv,name,len,&PL_sv_yes,0);
                    return &PL_sv_yes;
                }
            }
            (void)hv_store(hv,name,len,&PL_sv_no,0);
        }
    }
#ifdef LAZY_LOAD
    gvp = (GV**)hv_fetch(stash,"_ISA",4,FALSE);
     
    if (gvp && (gv = *gvp) != (GV*)&PL_sv_undef && (av = GvAV(gv))) {
        if(!hv) {
            gvp = (GV**)hv_fetch(stash, "::ISA::CACHE::", 14, TRUE);
            gv = *gvp;
            if (SvTYPE(gv) != SVt_PVGV)
                gv_init(gv, stash, "::ISA::CACHE::", 14, TRUE);
            hv = GvHVn(gv);
        }
        if(hv) {
            SV** svp = AvARRAY(av);
            /* NOTE: No support for tied _ISA */
            I32 items = av_len(av) + 1;
            while (items--) {
                SV* sv = *svp++;
                HV* basestash = gv_stashsv(sv, FALSE);
                if (!basestash) {
                    /*dTHR;
                    if (ckWARN(WARN_MISC))
                        warner(WARN_SYNTAX,
                             "Can't locate package %s for @%s::_ISA",
                            SvPVX(sv), HvNAME(stash));*/
                        warn("Can't locate package %s for @%s::_ISA",
                            SvPVX(sv), HvNAME(stash));
                    continue;
                }
                if(&PL_sv_yes == isa_lookup(basestash, name, len, level + 1)) {
                    (void)hv_store(hv,name,len,&PL_sv_yes,0);
                    return &PL_sv_yes;
                }
            }
            (void)hv_store(hv,name,len,&PL_sv_no,0);
        }
    }
#endif
    return boolSV(strEQ(name, "UNIVERSAL"));
}
bool
PerlGtk_sv_derived_from(SV *sv, char *name)
{
    SV *rv;
    char *type;
    HV *stash;
   
    stash = Nullhv;
    type = Nullch;
  
    if (SvGMAGICAL(sv))
        mg_get(sv) ;
    if (SvROK(sv)) {
        sv = SvRV(sv);
        type = sv_reftype(sv,0);
        if(SvOBJECT(sv))
            stash = SvSTASH(sv);
    }
    else {
        stash = gv_stashsv(sv, FALSE);
    }
  
    return (type && strEQ(type,name)) ||
            (stash && isa_lookup(stash, name, strlen(name), 0) == &PL_sv_yes)
        ? TRUE
        : FALSE ;
  
}
#endif