The R Project SVN R

/*
 *  R : A Computer Langage for Statistical Data Analysis
 *  Copyright (C) 1995, 1996  Robert Gentleman and Ross Ihaka
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifdef HAVE_CONFIG_H
#include <Rconfig.h>
#endif

#include "Defn.h"

/*  duplicate  -  object duplication  */

/*  Because we try to maintain the illusion of call by
 *  value, we often need to duplicate entire data
 *  objects.  There are a couple of points to note.
 *  First, duplication of list-like objects is done
 *  iteratively to prevent growth of the pointer
 *  protection stack, and second, the duplication of
 *  promises requires that the promises be forced and
 *  the value duplicated.  */

SEXP duplicate(SEXP s)
{
    SEXP h, t,  sp;
    int i, n;

    switch (TYPEOF(s)) {
    case NILSXP:
    case SYMSXP:
    case ENVSXP:
    case SPECIALSXP:
    case BUILTINSXP:
    return s;
    case CLOSXP:
    PROTECT(s);
    PROTECT(t = allocSExp(CLOSXP));
    FORMALS(t) = FORMALS(s);
    BODY(t) = BODY(s);
    CLOENV(t) = CLOENV(s);
    ATTRIB(t) = duplicate(ATTRIB(s));
    UNPROTECT(2);
    break;
    case LISTSXP:
    PROTECT(sp = s);
    PROTECT(h = t = CONS(R_NilValue, R_NilValue));
    while(sp != R_NilValue) {
        CDR(t) = CONS(duplicate(CAR(sp)), R_NilValue);
        t = CDR(t);
        TAG(t) = TAG(sp);
        ATTRIB(t) = duplicate(ATTRIB(sp));
        sp = CDR(sp);
    }
    t = CDR(h);
    UNPROTECT(2);
    break;
    case LANGSXP:
    PROTECT(sp = s);
    PROTECT(h = t = CONS(R_NilValue, R_NilValue));
    while(sp != R_NilValue) {
        CDR(t) = CONS(duplicate(CAR(sp)), R_NilValue);
        t = CDR(t);
        TAG(t) = TAG(sp);
        ATTRIB(t) = duplicate(ATTRIB(sp));
        sp = CDR(sp);
    }
    t = CDR(h);
    TYPEOF(t) = LANGSXP;
    ATTRIB(t) = duplicate(ATTRIB(s));
    UNPROTECT(2);
    break;
    case CHARSXP:
    PROTECT(s);
    PROTECT(t = allocString(strlen(CHAR(s))));
    strcpy(CHAR(t), CHAR(s));
    ATTRIB(t) = duplicate(ATTRIB(s));
    UNPROTECT(2);
    break;
    case EXPRSXP:
    case VECSXP:
    n = length(s);
    PROTECT(s);
    PROTECT(t = allocVector(TYPEOF(s), LENGTH(s)));
    for(i = 0 ; i < n ; i++)
        VECTOR(t)[i] = duplicate(VECTOR(s)[i]);
    ATTRIB(t) = duplicate(ATTRIB(s));
    TRUELENGTH(t) = TRUELENGTH(s);
    UNPROTECT(2);
    break;
    case STRSXP:
    case LGLSXP:
    case INTSXP:
    case REALSXP:
    case CPLXSXP:
    PROTECT(s);
    t = allocVector(TYPEOF(s), LENGTH(s));
    copyVector(t, s);
    PROTECT(t);
    ATTRIB(t) = duplicate(ATTRIB(s));
    UNPROTECT(2);
    TRUELENGTH(t) = TRUELENGTH(s);
    break;
    case PROMSXP: /* duplication requires that we evaluate the promise */
#ifdef OLD
    if (PRVALUE(s) == R_UnboundValue) {
        t = eval(PREXPR(s), PRENV(s));
        PRVALUE(s) = t;
    }
    t = duplicate(PRVALUE(s));
#endif
    return s;
    break;
    default:
    UNIMPLEMENTED("duplicate");
    t = s;/* for -Wall */
    }
    if(TYPEOF(t) == TYPEOF(s) ) /* surely it only makes sense in this case*/
    OBJECT(t) = OBJECT(s);
    return t;
}

void copyVector(SEXP s, SEXP t)
{
    int i, ns, nt;

    nt = LENGTH(t);
    ns = LENGTH(s);
    switch (TYPEOF(s)) {
    case STRSXP:
    case EXPRSXP:
    for (i = 0; i < ns; i++)
        VECTOR(s)[i] = VECTOR(t)[i % nt];
    break;
    case LGLSXP:
    for (i = 0; i < ns; i++)
        LOGICAL(s)[i] = LOGICAL(t)[i % nt];
    break;
    case INTSXP:
    for (i = 0; i < ns; i++)
        INTEGER(s)[i] = INTEGER(t)[i % nt];
    break;
    case REALSXP:
    for (i = 0; i < ns; i++)
        REAL(s)[i] = REAL(t)[i % nt];
    break;
    case CPLXSXP:
    for (i = 0; i < ns; i++)
        COMPLEX(s)[i] = COMPLEX(t)[i % nt];
    break;
    default:
    UNIMPLEMENTED("copyVector");
    }
}

void copyListMatrix(SEXP s, SEXP t, int byrow)
{
    SEXP pt, tmp;
    int i, j, nr, nc, ns;

    nr = nrows(s);
    nc = ncols(s);
    ns = nr*nc;
    pt = t;
    if(byrow) {
    PROTECT(tmp = allocVector(STRSXP, nr*nc));
    for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++) {
        STRING(tmp)[i + j * nr] = duplicate(CAR(pt));
        pt = CDR(pt);
        if(pt == R_NilValue) pt = t;
        }
    for (i = 0; i < ns; i++) {
        CAR(s) = STRING(tmp)[i++];
        s = CDR(s);
    }
    UNPROTECT(1);
    }
    else {
    for (i = 0; i < ns; i++) {
        CAR(s) = duplicate(CAR(pt));
        s = CDR(s);
        pt = CDR(pt);
        if(pt == R_NilValue) pt = t;
    }
    }
}

void copyMatrix(SEXP s, SEXP t, int byrow)
{
    int i, j, k, nr, nc, nt;

    nr = nrows(s);
    nc = ncols(s);
    nt = LENGTH(t);
    k = 0;

    if (byrow) {
    switch (TYPEOF(s)) {
    case STRSXP:
        for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++)
            STRING(s)[i + j * nr] = STRING(t)[k++ % nt];
        break;
    case LGLSXP:
        for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++)
            LOGICAL(s)[i + j * nr] = LOGICAL(t)[k++ % nt];
        break;
    case INTSXP:
        for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++)
            INTEGER(s)[i + j * nr] = INTEGER(t)[k++ % nt];
        break;
    case REALSXP:
        for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++)
            REAL(s)[i + j * nr] = REAL(t)[k++ % nt];
        break;
    case CPLXSXP:
        for (i = 0; i < nr; i++)
        for (j = 0; j < nc; j++)
            COMPLEX(s)[i + j * nr] = COMPLEX(t)[k++ % nt];
        break;
    default:
        UNIMPLEMENTED("copyMatrix");
    }
    }
    else
    copyVector(s, t);
}