source: git/Singular/lists.cc

/****************************************
*  Computer Algebra System SINGULAR     *
****************************************/
/*
* ABSTRACT: handling of the list type
*/
// to produce a non-inline version from lists.h
#define LISTS_CC




#include "kernel/mod2.h"
#include "Singular/tok.h"
//#include "ipid.h"
#include "kernel/polys.h"
#include "kernel/ideals.h"
#include "Singular/attrib.h"
#include "Singular/ipshell.h"
#include "misc/intvec.h"
#include "Singular/lists.h"

VAR omBin slists_bin = omGetSpecBin(sizeof(slists));

int lSize(lists L)
{
  int n=L->nr;
  while ((n>=0)&&((L->m[n].rtyp==DEF_CMD)||(L->m[n].rtyp==0))) n--;
  return n;
}

lists lCopy(lists L)
{
  lists N=(lists)omAlloc0Bin(slists_bin);
  int n=L->nr;
  if (n>=0)
    N->Init(n+1);
  else
    N->Init();
  for(;n>=0;n--)
  {
    N->m[n].Copy(&L->m[n]);
  }
  //Print("copy list with %d -> %d elems\n",L->nr,N->nr);
  return N;
}

/*2
* concat 2 lists
*/
BOOLEAN lAdd(leftv res, leftv u, leftv v)
{
  lists l=(lists) omAllocBin(slists_bin);
  lists ul=(lists)u->CopyD();
  lists vl=(lists)v->CopyD();
  l->Init(ul->nr+vl->nr+2);
  int i;

  for(i=0;i<=ul->nr;i++)
  {
    //Print("u[%d]->r[%d]\n",i,i);
    l->m[i].rtyp=ul->m[i].rtyp;
    l->m[i].data=ul->m[i].data;
  }
  for(i=0;i<=vl->nr;i++)
  {
    //Print("v[%d]->r[%d]\n",i,i+ul->nr+1);
    l->m[i+ul->nr+1].rtyp=vl->m[i].rtyp;
    l->m[i+ul->nr+1].data=vl->m[i].data;
  }
  if (ul->m != NULL)
    omFreeSize((ADDRESS)ul->m,(ul->nr+1)*sizeof(sleftv));
  omFreeBin((ADDRESS)ul, slists_bin);
  if (vl->m != NULL)
    omFreeSize((ADDRESS)vl->m,(vl->nr+1)*sizeof(sleftv));
  omFreeBin((ADDRESS)vl, slists_bin);
  memset(u,0,sizeof(*u));
  memset(v,0,sizeof(*v));
  res->data = (char *)l;
  //res->Print();
  return FALSE;
}

/*2
* insert v into list ul, destroys u
*/
lists lInsert0(lists ul, leftv v, int pos)
{
  if ((pos<0)||(v->rtyp==NONE))
    return NULL;
  lists l=(lists) omAllocBin(slists_bin);
  l->Init(si_max(ul->nr+2,pos+1));
  int i,j;

  for(i=j=0;i<=ul->nr;i++,j++)
  {
    if(j==pos) j++;
    l->m[j]=ul->m[i];
  }
  for(j=ul->nr+1;j<pos;j++)
    l->m[j].rtyp=DEF_CMD;
  // memset(&(l->m[pos]),0,sizeof(sleftv)); - done by Init
  l->m[pos].rtyp=v->Typ();
  l->m[pos].data=v->CopyD();
  l->m[pos].flag=v->flag;
  attr *a=v->Attribute();
  if ((a!=NULL)&&(*a!=NULL))
  {
    l->m[pos].attribute=(*a)->Copy();
  }
  if (ul->m != NULL)
    omFreeSize((ADDRESS)ul->m,(ul->nr+1)*sizeof(sleftv));
  omFreeBin((ADDRESS)ul, slists_bin);
  return l;
}

/*2
* insert v into list u, at the beginning
*/
BOOLEAN lInsert(leftv res, leftv u, leftv v)
{
  lists ul=(lists)u->CopyD();
  res->data=(char *)lInsert0(ul,v,0);
  if (res->data==NULL)
  {
    Werror("cannot insert type `%s`",Tok2Cmdname(v->Typ()));
    return TRUE;
  }
  return FALSE;
}

/*2
* insert v into list u at pos w
*/
BOOLEAN lInsert3(leftv res, leftv u, leftv v, leftv w)
{
  lists ul=(lists)u->CopyD();
  res->data=(char *)lInsert0(ul,v,(int)(long)w->Data());
  if (res->data==NULL)
  {
    Werror("cannot insert type `%s` at pos. %d",
      Tok2Cmdname(v->Typ()),(int)(long)w->Data());
    return TRUE;
  }
  return FALSE;
}

/*2
* append v to list u
*/
BOOLEAN lAppend(leftv res, leftv u, leftv v)
{
  lists ul=(lists)u->CopyD();
  res->data=(char *)lInsert0(ul,v,ul->nr+1);
  return (res->data==NULL);
}

/*2
* delete v-th element from list u
*/
BOOLEAN lDelete(leftv res, leftv u, leftv v)
{
  lists ul=(lists)u->Data();
  int VIndex=(int)(long)v->Data()-1;
  int EndIndex=lSize(ul);

  if((0<=VIndex)&&(VIndex<=ul->nr))
  {
    ul=(lists)u->CopyD();
    int i,j;
    lists l=(lists) omAllocBin(slists_bin);
    l->Init(EndIndex+(VIndex>EndIndex));

    ul->m[VIndex].CleanUp();
    for(i=0;i<VIndex;i++)
    {
      l->m[i]=ul->m[i];
    }
    for(i=VIndex+1;i<=ul->nr;i++)
    {
      l->m[i-1]=ul->m[i];
    }
    omFreeSize((ADDRESS)ul->m,(ul->nr+1)*sizeof(sleftv));
    omFreeBin((ADDRESS)ul, slists_bin);
    res->data = (char *)l;
    return FALSE;
  }
  Werror("wrong index %d in list(%d)",VIndex+1,ul->nr+1);
  return TRUE;
}

BOOLEAN lDeleteIV(leftv res, leftv u, leftv v)
{
  lists ul=(lists)u->CopyD();
  intvec* vl=(intvec*)v->Data();
  int i,j,cnt;
  cnt=0;
  for(i=vl->length()-1;i>=0;i--)
  {
    j=(*vl)[i];
    if ((j>0)&&(j<=ul->nr))
    {
      cnt++;
      ul->m[j-1].CleanUp();
      memcpy(&(ul->m[j-1]),&(ul->m[j]),(ul->nr-j+1)*sizeof(sleftv));
      ul->m[ul->nr].rtyp=DEF_CMD;
      ul->m[ul->nr].data=NULL;
    }
  }
  if ((cnt*2>=ul->nr)||(cnt*sizeof(sleftv)>=1024))
  {
    ul->m=(leftv)omReallocSize(ul->m,(ul->nr+1)*sizeof(sleftv),(ul->nr-cnt+1)*sizeof(sleftv));
    ul->nr -= cnt;
  }
  res->data = (char *)ul;
  return FALSE;
}

/*2
* check, if a list contains any ring dependend data
*/
BOOLEAN lRingDependend(lists L)
{
  if (L==NULL) return FALSE;
  int i=L->nr;
  while (i>=0)
  {
    REGISTER int t=L->m[i].rtyp;
    if ((BEGIN_RING<t /*L->m[i].rtyp*/)
    && (/*L->m[i].rtyp*/ t<END_RING))
      return TRUE;
    if ((/*L->m[i].rtyp*/ t==LIST_CMD)&&lRingDependend((lists)L->m[i].data))
      return TRUE;
    i--;
  }
  return FALSE;
}

lists liMakeResolv(resolvente r, int length, int reallen,
  int typ0, intvec ** weights, int add_row_shift)
{
  // re-uses r, weights[i]
  lists L=(lists)omAlloc0Bin(slists_bin);
  if (length<=0)
  {
    // handle "empty" resolutions
    L->Init(0);
  }
  else
  {
    int oldlength=length;
    while (r[length-1]==NULL) length--;
    if (reallen<=0) reallen=currRing->N;
    reallen=si_max(reallen,length);
    L->Init(reallen);
    int i=0;

    while (i<length)
    {
      if (r[i]!=NULL)
      {
        if (i==0)
        {
          L->m[i].rtyp=typ0;
          int j=IDELEMS(r[0])-1;
          while ((j>0) && (r[0]->m[j]==NULL)) j--;
          j++;
          if (j!=IDELEMS(r[0]))
          {
            pEnlargeSet(&(r[0]->m),IDELEMS(r[0]),j-IDELEMS(r[0]));
            IDELEMS(r[0])=j;
          }
        }
        else
        {
          L->m[i].rtyp=MODUL_CMD;
          int rank=IDELEMS(r[i-1]);
          if (idIs0(r[i-1]))
          {
            idDelete(&(r[i]));
            r[i]=id_FreeModule(rank, currRing);
          }
          else
          {
            r[i]->rank=si_max(rank,(int)id_RankFreeModule(r[i], currRing));
          }
          idSkipZeroes(r[i]);
        }
        L->m[i].data=(void *)r[i];
        if ((weights!=NULL) && (weights[i]!=NULL))
        {
          intvec *w=weights[i];
          (*w) += add_row_shift;
          atSet((idhdl)&L->m[i],omStrDup("isHomog"),w,INTVEC_CMD);
          weights[i] = NULL;
        }
      }
      #ifdef TEST
      else
      {
        // should not happen:
        WarnS("internal NULL in resolvente");
        L->m[i].data=(void *)idInit(1,1);
      }
      #endif
      i++;
    }
    omFreeSize((ADDRESS)r,oldlength*sizeof(ideal));
    if (weights!=NULL) omFreeSize(weights,oldlength*sizeof(intvec*));
    if (i==0)
    {
      L->m[0].rtyp=typ0;
      L->m[0].data=(char *)idInit(1,1);
      i=1;
    }
    while (i<reallen)
    {
      L->m[i].rtyp=MODUL_CMD;
      ideal I=(ideal)L->m[i-1].data;
      ideal J;
      int rank=IDELEMS(I);
      if (idIs0(I))
      {
        J=idFreeModule(rank);
      }
      else
      {
        J=idInit(1,rank);
      }
      L->m[i].data=(void *)J;
      i++;
    }
    //Print("make res of length %d (0..%d) L:%d\n",length,length-1,L->nr);
  }
  return L;
}

resolvente liFindRes(lists L, int * len, int *typ0,intvec *** weights)
{
  resolvente r;
  intvec ** w=NULL,*tw=NULL;

  *len=L->nr+1;
  if (*len<=0)
  {
    WerrorS("empty list");
    return NULL;
  }
  r=(ideal *)omAlloc0((*len)*sizeof(ideal));
  w=(intvec**)omAlloc0((*len)*sizeof(intvec*));
  int i=0;
  *typ0=MODUL_CMD;
  while (i<(*len))
  {
    if (L->m[i].rtyp != MODUL_CMD)
    {
      if (L->m[i].rtyp!=IDEAL_CMD)
      {
        Werror("element %d is not of type module",i+1);
        omFreeSize((ADDRESS)r,(*len)*sizeof(ideal));
        return NULL;
      }
      *typ0=IDEAL_CMD;
    }
    if ((i>0) && (idIs0(r[i-1])))
    {
      //*len=i-1;
      break;
    }
    r[i]=(ideal)L->m[i].data;
    tw=(intvec*)atGet(&(L->m[i]),"isHomog",INTVEC_CMD);
    if (tw!=NULL)
    {
      w[i]=ivCopy(tw);
    }
    tw = NULL;
    i++;
  }
  BOOLEAN hom_complex=TRUE;
  int j=0;
  while ((j<i) && hom_complex)
  {
    hom_complex = hom_complex && (w[j]!=NULL);
    j++;
  }
  if ((!hom_complex) || (weights==NULL))
  {
    for (j=0;j<i;j++)
    {
      if (w[j]!=NULL) delete w[j];
    }
    omFreeSize((ADDRESS)w,(*len)*sizeof(intvec*));
    if (weights!=NULL) *weights=NULL;
  }
  else
  {
    *weights = w;
  }
  //Print("find res of length %d (0..%d) L:%d\n",*len,(*len)-1,L->nr);
  return r;
}

char* lString(lists l, BOOLEAN typed, int dim)
{
  if (l->nr == -1)
  {
    if (typed) return omStrDup("list()");
    return omStrDup("");
  }

  char** slist = (char**) omAlloc((l->nr+1) * sizeof(char*));
  int i, j, k;
  char *s;
  for (i=0, j = 0, k = 0; i<=l->nr; i++)
  {
    slist[i] = l->m[i].String(NULL, typed, dim);
    assume(slist[i] != NULL);
    omCheckAddr(slist[i]);
    if (*(slist[i]) != '\0')
    {
      j += strlen(slist[i]);
      k++;
    }
  }
  size_t len=j+k+2+(typed ? 10 : 0) + (dim == 2 ? k : 0);
  s = (char*) omAlloc(len);

  if (typed)
    snprintf(s, len,"list(");
  else
    *s = '\0';

  for (i=0; i<=l->nr; i++)
  {
    if (*(slist[i]) != '\0')
    {
      strcat(s, slist[i]);
      strcat(s, ",");
      if (dim == 2) strcat(s, "\n");
    }
    omCheckAddr(s);
    omFree(slist[i]);
  }
  if (k > 0) s[strlen(s) - (dim == 2 ? 2 : 1)] = '\0';
  if (typed) strcat(s, ")");
  omCheckAddr(s);
  omFreeSize(slist, (l->nr+1) * sizeof(char*));
  return s;
}