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coerce.c
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coerce.c
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/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 1995-2004 Robert Gentleman, Ross Ihaka and the
* R Development Core Team
*
* 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., 51 Franklin Street Fifth Floor, Boston, MA 02110-1301 USA
*/
/* <UTF8> char here is either ASCII or handled as a whole */
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <Defn.h> /*-- Maybe modularize into own Coerce.h ..*/
#include <Rmath.h>
#include <Print.h>
/* This section of code handles type conversion for elements */
/* of data vectors. Type coercion throughout R should use these */
/* routines to ensure consistency. */
const static char * const truenames[] = {
"T",
"True",
"TRUE",
"true",
(char *) 0,
};
const static char * const falsenames[] = {
"F",
"False",
"FALSE",
"false",
(char *) 0,
};
/* Coercion warnings will be OR'ed : */
#define WARN_NA 1
#define WARN_INACC 2
#define WARN_IMAG 4
#define WARN_RAW 8
/* The following two macros copy or clear the attributes. They also
ensure that the object bit is properly set. They avoid calling the
assignment functions when possible, since the write barrier (and
possibly cache behavior on some architectures) makes assigning more
costly than dereferencing. */
#define DUPLICATE_ATTRIB(to, from) do {\
SEXP __from__ = (from); \
if (ATTRIB(__from__) != R_NilValue) { \
SEXP __to__ = (to); \
SET_ATTRIB(__to__, duplicate(ATTRIB(__from__))); \
if (OBJECT(__from__)) SET_OBJECT(__to__, 1); \
} \
} while (0)
#define CLEAR_ATTRIB(x) do {\
SEXP __x__ = (x); \
if (ATTRIB(__x__) != R_NilValue) { \
SET_ATTRIB(__x__, R_NilValue); \
if (OBJECT(__x__)) SET_OBJECT(__x__, 0); \
} \
} while (0)
void CoercionWarning(int warn)
{
/* FIXME: Use
=====
WarningMessage(R_NilValue, WARNING_....);
*/
if (warn & WARN_NA)
warning(_("NAs introduced by coercion"));
if (warn & WARN_INACC)
warning(_("inaccurate integer conversion in coercion"));
if (warn & WARN_IMAG)
warning(_("imaginary parts discarded in coercion"));
if (warn & WARN_RAW)
warning(_("out-of-range values treated as 0 in coercion to raw"));
}
/* allows integers including hex representations */
static double R_strtol(const char *nptr, char **endptr)
{
double ret = 0, sign = +1;
const char *p = nptr;
if(strlen(p) >= 2 && p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
/* a hex number */
p +=2;
for(; p; p++) {
if('0' <= *p && *p <= '9') ret = 16*ret + (*p -'0');
else if('a' <= *p && *p <= 'f') ret = 16*ret + (*p -'a' + 10);
else if('A' <= *p && *p <= 'F') ret = 16*ret + (*p -'A' + 10);
else goto done;
}
}
for(p = nptr; p; p++) {
if(*p == '+') continue;
if(*p == '-') { sign = -1; continue;}
if('0' <= *p && *p <= '9') ret = 10*ret + (*p -'0');
else goto done;
}
done:
if(endptr) *endptr = (char *)p;
return sign*ret;
}
/* used in X11 module */
double R_strtod(const char *c, char **end)
{
double x;
if (strncmp(c, "NA", 2) == 0){
x = NA_REAL; *end = (char *)c + 2; /* coercion for -Wall */
}
else if (strncmp(c, "NaN", 3) == 0) {
x = R_NaN; *end = (char *)c + 3;
}
else if (strncmp(c, "Inf", 3) == 0) {
x = R_PosInf; *end = (char *)c + 3;
}
else if (strncmp(c, "-Inf", 4) == 0) {
x = R_NegInf; *end = (char *)c + 4;
}
else if (!strncmp(c, "0x", 2) || !strncmp(c, "0x", 2)) {
x = R_strtol(c, end);
} else
x = strtod(c, end);
return x;
}
int LogicalFromInteger(int x, int *warn)
{
return (x == NA_INTEGER) ?
NA_LOGICAL : (x != 0);
}
int LogicalFromReal(double x, int *warn)
{
return ISNAN(x) ?
NA_LOGICAL : (x != 0);
}
int LogicalFromComplex(Rcomplex x, int *warn)
{
return (ISNAN(x.r) || ISNAN(x.i)) ?
NA_LOGICAL : (x.r != 0 || x.i != 0);
}
int LogicalFromString(SEXP x, int *warn)
{
if (x != R_NaString) {
int i;
for (i = 0; truenames[i]; i++)
if (!strcmp(CHAR(x), truenames[i]))
return 1;
for (i = 0; falsenames[i]; i++)
if (!strcmp(CHAR(x), falsenames[i]))
return 0;
}
return NA_LOGICAL;
}
int IntegerFromLogical(int x, int *warn)
{
return (x == NA_LOGICAL) ?
NA_INTEGER : x;
}
int IntegerFromReal(double x, int *warn)
{
if (ISNAN(x))
return NA_INTEGER;
else if (x > INT_MAX || x <= INT_MIN ) {
*warn |= WARN_NA;
return NA_INTEGER;
}
return x;
}
int IntegerFromComplex(Rcomplex x, int *warn)
{
if (ISNAN(x.r) || ISNAN(x.i))
return NA_INTEGER;
else if (x.r > INT_MAX || x.r <= INT_MIN ) {
*warn |= WARN_NA;
return NA_INTEGER;;
}
if (x.i != 0)
*warn |= WARN_IMAG;
return x.r;
}
int IntegerFromString(SEXP x, int *warn)
{
double xdouble;
char *endp;
if (x != R_NaString && !isBlankString(CHAR(x))) {
xdouble = R_strtod(CHAR(x), &endp);
if (isBlankString(endp)) {
if (xdouble > INT_MAX) {
*warn |= WARN_INACC;
return INT_MAX;
}
else if(xdouble < INT_MIN+1) {
*warn |= WARN_INACC;
return INT_MIN;
}
else
return xdouble;
}
else *warn |= WARN_NA;
}
return NA_INTEGER;
}
double RealFromLogical(int x, int *warn)
{
return (x == NA_LOGICAL) ?
NA_REAL : x;
}
double RealFromInteger(int x, int *warn)
{
if (x == NA_INTEGER)
return NA_REAL;
else
return x;
}
double RealFromComplex(Rcomplex x, int *warn)
{
if (ISNAN(x.r) || ISNAN(x.i))
return NA_REAL;
if (x.i != 0)
*warn |= WARN_IMAG;
return x.r;
}
double RealFromString(SEXP x, int *warn)
{
double xdouble;
char *endp;
if (x != R_NaString && !isBlankString(CHAR(x))) {
xdouble = R_strtod(CHAR(x), &endp);
if (isBlankString(endp))
return xdouble;
else
*warn |= WARN_NA;
}
return NA_REAL;
}
Rcomplex ComplexFromLogical(int x, int *warn)
{
Rcomplex z;
if (x == NA_LOGICAL) {
z.r = NA_REAL;
z.i = NA_REAL;
}
else {
z.r = x;
z.i = 0;
}
return z;
}
Rcomplex ComplexFromInteger(int x, int *warn)
{
Rcomplex z;
if (x == NA_INTEGER) {
z.r = NA_REAL;
z.i = NA_REAL;
}
else {
z.r = x;
z.i = 0;
}
return z;
}
Rcomplex ComplexFromReal(double x, int *warn)
{
Rcomplex z;
if (ISNAN(x)) {
z.r = NA_REAL;
z.i = NA_REAL;
}
else {
z.r = x;
z.i = 0;
}
return z;
}
Rcomplex ComplexFromString(SEXP x, int *warn)
{
double xr, xi;
Rcomplex z;
char *endp = CHAR(x);;
z.r = z.i = NA_REAL;
if (x != R_NaString && !isBlankString(endp)) {
xr = R_strtod(endp, &endp);
if (isBlankString(endp)) {
z.r = xr;
z.i = 0.0;
}
else if (*endp == '+' || *endp == '-') {
xi = R_strtod(endp, &endp);
if (*endp++ == 'i' && isBlankString(endp)) {
z.r = xr;
z.i = xi;
}
else *warn |= WARN_NA;
}
else *warn |= WARN_NA;
}
return z;
}
SEXP StringFromLogical(int x, int *warn)
{
int w;
formatLogical(&x, 1, &w);
if (x == NA_LOGICAL) return NA_STRING;
else return mkChar(EncodeLogical(x, w));
}
SEXP StringFromInteger(int x, int *warn)
{
int w;
formatInteger(&x, 1, &w);
if (x == NA_INTEGER) return NA_STRING;
else return mkChar(EncodeInteger(x, w));
}
SEXP StringFromReal(double x, int *warn)
{
int w, d, e;
formatReal(&x, 1, &w, &d, &e, 0);
if (ISNA(x)) return NA_STRING;
else return mkChar(EncodeReal(x, w, d, e, OutDec));
}
SEXP StringFromComplex(Rcomplex x, int *warn)
{
int wr, dr, er, wi, di, ei;
formatComplex(&x, 1, &wr, &dr, &er, &wi, &di, &ei, 0);
if (ISNA(x.r) || ISNA(x.i)) return NA_STRING;
else
return mkChar(EncodeComplex(x, wr, dr, er, wi, di, ei, OutDec));
}
SEXP StringFromRaw(Rbyte x, int *warn)
{
char buf[3];
sprintf(buf, "%02x", x);
return mkChar(buf);
}
/* Conversion between the two list types (LISTSXP and VECSXP). */
SEXP PairToVectorList(SEXP x)
{
SEXP xptr, xnew, xnames;
int i, len = 0, named = 0;
for (xptr = x ; xptr != R_NilValue ; xptr = CDR(xptr)) {
named = named | (TAG(xptr) != R_NilValue);
len++;
}
PROTECT(x);
PROTECT(xnew = allocVector(VECSXP, len));
for (i = 0, xptr = x; i < len; i++, xptr = CDR(xptr))
SET_VECTOR_ELT(xnew, i, CAR(xptr));
if (named) {
PROTECT(xnames = allocVector(STRSXP, len));
xptr = x;
for (i = 0, xptr = x; i < len; i++, xptr = CDR(xptr)) {
if(TAG(xptr) == R_NilValue)
SET_STRING_ELT(xnames, i, R_BlankString);
else
SET_STRING_ELT(xnames, i, PRINTNAME(TAG(xptr)));
}
setAttrib(xnew, R_NamesSymbol, xnames);
UNPROTECT(1);
}
copyMostAttrib(x, xnew);
UNPROTECT(2);
return xnew;
}
SEXP VectorToPairList(SEXP x)
{
SEXP xptr, xnew, xnames;
int i, len, named;
len = length(x);
PROTECT(x);
PROTECT(xnew = allocList(len));
PROTECT(xnames = getAttrib(x, R_NamesSymbol));
named = (xnames != R_NilValue);
xptr = xnew;
for (i = 0; i < len; i++) {
SETCAR(xptr, VECTOR_ELT(x, i));
if (named && CHAR(STRING_ELT(xnames, i))[0] != '\0')
SET_TAG(xptr, install(CHAR(STRING_ELT(xnames, i))));
xptr = CDR(xptr);
}
if (len>0) /* can't set attributes on NULL */
copyMostAttrib(x, xnew);
UNPROTECT(3);
return xnew;
}
static SEXP coerceToSymbol(SEXP v)
{
SEXP ans = R_NilValue;
int warn = 0;
if (length(v) <= 0)
error(_("invalid data of mode \"%s\" (too short)"),
CHAR(type2str(TYPEOF(v))));
PROTECT(v);
switch(TYPEOF(v)) {
case LGLSXP:
ans = StringFromLogical(LOGICAL(v)[0], &warn);
break;
case INTSXP:
ans = StringFromInteger(INTEGER(v)[0], &warn);
break;
case REALSXP:
ans = StringFromReal(REAL(v)[0], &warn);
break;
case CPLXSXP:
ans = StringFromComplex(COMPLEX(v)[0], &warn);
break;
case STRSXP:
ans = STRING_ELT(v, 0);
break;
case RAWSXP:
ans = StringFromRaw(RAW(v)[0], &warn);
break;
default:
UNIMPLEMENTED_TYPE("coerceToSymbol", v);
}
if (warn) CoercionWarning(warn);/*2000/10/23*/
ans = install(CHAR(ans));
UNPROTECT(1);
return ans;
}
static SEXP coerceToLogical(SEXP v)
{
SEXP ans;
int i, n, warn = 0;
PROTECT(ans = allocVector(LGLSXP, n = length(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case INTSXP:
for (i = 0; i < n; i++)
LOGICAL(ans)[i] = LogicalFromInteger(INTEGER(v)[i], &warn);
break;
case REALSXP:
for (i = 0; i < n; i++)
LOGICAL(ans)[i] = LogicalFromReal(REAL(v)[i], &warn);
break;
case CPLXSXP:
for (i = 0; i < n; i++)
LOGICAL(ans)[i] = LogicalFromComplex(COMPLEX(v)[i], &warn);
break;
case STRSXP:
for (i = 0; i < n; i++)
LOGICAL(ans)[i] = LogicalFromString(STRING_ELT(v, i), &warn);
break;
case RAWSXP:
for (i = 0; i < n; i++)
LOGICAL(ans)[i] = LogicalFromInteger((int)RAW(v)[i], &warn);
break;
default:
UNIMPLEMENTED_TYPE("coerceToLogical", v);
}
if (warn) CoercionWarning(warn);
UNPROTECT(1);
return ans;
}
static SEXP coerceToInteger(SEXP v)
{
SEXP ans;
int i, n, warn = 0;
PROTECT(ans = allocVector(INTSXP, n = LENGTH(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
INTEGER(ans)[i] = IntegerFromLogical(LOGICAL(v)[i], &warn);
break;
case REALSXP:
for (i = 0; i < n; i++)
INTEGER(ans)[i] = IntegerFromReal(REAL(v)[i], &warn);
break;
case CPLXSXP:
for (i = 0; i < n; i++)
INTEGER(ans)[i] = IntegerFromComplex(COMPLEX(v)[i], &warn);
break;
case STRSXP:
for (i = 0; i < n; i++)
INTEGER(ans)[i] = IntegerFromString(STRING_ELT(v, i), &warn);
break;
case RAWSXP:
for (i = 0; i < n; i++)
INTEGER(ans)[i] = (int)RAW(v)[i];
break;
default:
UNIMPLEMENTED_TYPE("coerceToInteger", v);
}
if (warn) CoercionWarning(warn);
UNPROTECT(1);
return ans;
}
static SEXP coerceToReal(SEXP v)
{
SEXP ans;
int i, n, warn = 0;
PROTECT(ans = allocVector(REALSXP, n = LENGTH(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
REAL(ans)[i] = RealFromLogical(LOGICAL(v)[i], &warn);
break;
case INTSXP:
for (i = 0; i < n; i++)
REAL(ans)[i] = RealFromInteger(INTEGER(v)[i], &warn);
break;
case CPLXSXP:
for (i = 0; i < n; i++)
REAL(ans)[i] = RealFromComplex(COMPLEX(v)[i], &warn);
break;
case STRSXP:
for (i = 0; i < n; i++)
REAL(ans)[i] = RealFromString(STRING_ELT(v, i), &warn);
break;
case RAWSXP:
for (i = 0; i < n; i++)
REAL(ans)[i] = RealFromInteger((int)RAW(v)[i], &warn);
break;
default:
UNIMPLEMENTED_TYPE("coerceToReal", v);
}
if (warn) CoercionWarning(warn);
UNPROTECT(1);
return ans;
}
static SEXP coerceToComplex(SEXP v)
{
SEXP ans;
int i, n, warn = 0;
PROTECT(ans = allocVector(CPLXSXP, n = LENGTH(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
COMPLEX(ans)[i] = ComplexFromLogical(LOGICAL(v)[i], &warn);
break;
case INTSXP:
for (i = 0; i < n; i++)
COMPLEX(ans)[i] = ComplexFromInteger(INTEGER(v)[i], &warn);
break;
case REALSXP:
for (i = 0; i < n; i++)
COMPLEX(ans)[i] = ComplexFromReal(REAL(v)[i], &warn);
break;
case STRSXP:
for (i = 0; i < n; i++)
COMPLEX(ans)[i] = ComplexFromString(STRING_ELT(v, i), &warn);
break;
case RAWSXP:
for (i = 0; i < n; i++)
COMPLEX(ans)[i] = ComplexFromInteger((int)RAW(v)[i], &warn);
break;
default:
UNIMPLEMENTED_TYPE("coerceToComplex", v);
}
if (warn) CoercionWarning(warn);
UNPROTECT(1);
return ans;
}
static SEXP coerceToRaw(SEXP v)
{
SEXP ans;
int i, n, warn = 0, tmp;
PROTECT(ans = allocVector(RAWSXP, n = LENGTH(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++) {
tmp = IntegerFromLogical(LOGICAL(v)[i], &warn);
if(tmp == NA_INTEGER) {
tmp = 0;
warn |= WARN_RAW;
}
RAW(ans)[i] = (Rbyte) tmp;
}
break;
case INTSXP:
for (i = 0; i < n; i++) {
tmp = INTEGER(v)[i];
if(tmp == NA_INTEGER || tmp < 0 || tmp > 255) {
tmp = 0;
warn |= WARN_RAW;
}
RAW(ans)[i] = (Rbyte) tmp;
}
break;
case REALSXP:
for (i = 0; i < n; i++) {
tmp = IntegerFromReal(REAL(v)[i], &warn);
if(tmp == NA_INTEGER || tmp < 0 || tmp > 255) {
tmp = 0;
warn |= WARN_RAW;
}
RAW(ans)[i] = (Rbyte) tmp;
}
break;
case CPLXSXP:
for (i = 0; i < n; i++) {
tmp = IntegerFromComplex(COMPLEX(v)[i], &warn);
if(tmp == NA_INTEGER || tmp < 0 || tmp > 255) {
tmp = 0;
warn |= WARN_RAW;
}
RAW(ans)[i] = (Rbyte) tmp;
}
break;
case STRSXP:
for (i = 0; i < n; i++) {
tmp = IntegerFromString(STRING_ELT(v, i), &warn);
if(tmp == NA_INTEGER || tmp < 0 || tmp > 255) {
tmp = 0;
warn |= WARN_RAW;
}
RAW(ans)[i] = (Rbyte) tmp;
}
break;
default:
UNIMPLEMENTED_TYPE("coerceToRaw", v);
}
if (warn) CoercionWarning(warn);
UNPROTECT(1);
return ans;
}
static SEXP coerceToString(SEXP v)
{
SEXP ans;
int i, n, savedigits, warn = 0;
PROTECT(ans = allocVector(STRSXP, n = LENGTH(v)));
DUPLICATE_ATTRIB(ans, v);
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
SET_STRING_ELT(ans, i, StringFromLogical(LOGICAL(v)[i], &warn));
break;
case INTSXP:
for (i = 0; i < n; i++)
SET_STRING_ELT(ans, i, StringFromInteger(INTEGER(v)[i], &warn));
break;
case REALSXP:
PrintDefaults(R_NilValue);
savedigits = R_print.digits; R_print.digits = DBL_DIG;/* MAX precision */
for (i = 0; i < n; i++)
SET_STRING_ELT(ans, i, StringFromReal(REAL(v)[i], &warn));
R_print.digits = savedigits;
break;
case CPLXSXP:
PrintDefaults(R_NilValue);
savedigits = R_print.digits; R_print.digits = DBL_DIG;/* MAX precision */
for (i = 0; i < n; i++)
SET_STRING_ELT(ans, i, StringFromComplex(COMPLEX(v)[i], &warn));
R_print.digits = savedigits;
break;
case RAWSXP:
for (i = 0; i < n; i++)
SET_STRING_ELT(ans, i, StringFromRaw(RAW(v)[i], &warn));
break;
default:
UNIMPLEMENTED_TYPE("coerceToString", v);
}
if (warn) CoercionWarning(warn);/*2000/10/23*/
UNPROTECT(1);
return (ans);
}
static SEXP coerceToExpression(SEXP v)
{
SEXP ans;
int i, n;
if (isVectorAtomic(v)) {
n = LENGTH(v);
PROTECT(ans = allocVector(EXPRSXP, n));
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarLogical(LOGICAL(v)[i]));
break;
case INTSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarInteger(INTEGER(v)[i]));
break;
case REALSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarReal(REAL(v)[i]));
break;
case CPLXSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarComplex(COMPLEX(v)[i]));
break;
case STRSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarString(STRING_ELT(v, i)));
break;
case RAWSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarRaw(RAW(v)[i]));
break;
default:
UNIMPLEMENTED_TYPE("coerceToExpression", v);
}
}
else {/* not used either */
PROTECT(ans = allocVector(EXPRSXP, 1));
SET_VECTOR_ELT(ans, 0, duplicate(v));
}
UNPROTECT(1);
return ans;
}
static SEXP coerceToVectorList(SEXP v)
{
SEXP ans, tmp;
int i, n;
n = length(v);
PROTECT(ans = allocVector(VECSXP, n));
switch (TYPEOF(v)) {
case LGLSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarLogical(LOGICAL(v)[i]));
break;
case INTSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarInteger(INTEGER(v)[i]));
break;
case REALSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarReal(REAL(v)[i]));
break;
case CPLXSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarComplex(COMPLEX(v)[i]));
break;
case STRSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarString(STRING_ELT(v, i)));
break;
case RAWSXP:
for (i = 0; i < n; i++)
SET_VECTOR_ELT(ans, i, ScalarRaw(RAW(v)[i]));
break;
case LISTSXP:
case LANGSXP:
tmp = v;
for (i = 0; i < n; i++) {
SET_VECTOR_ELT(ans, i, CAR(tmp));
tmp = CDR(tmp);
}
break;
default:
UNIMPLEMENTED_TYPE("coerceToVectorList", v);
}
tmp = getAttrib(v, R_NamesSymbol);
if (tmp != R_NilValue)
setAttrib(ans, R_NamesSymbol, tmp);
UNPROTECT(1);
return (ans);
}
static SEXP coerceToPairList(SEXP v)
{
SEXP ans, ansp;
int i, n;
n = LENGTH(v);
PROTECT(ansp = ans = allocList(n));
for (i = 0; i < n; i++) {
switch (TYPEOF(v)) {
case LGLSXP:
SETCAR(ansp, allocVector(LGLSXP, 1));
INTEGER(CAR(ansp))[0] = INTEGER(v)[i];
break;
case INTSXP:
SETCAR(ansp, allocVector(INTSXP, 1));
INTEGER(CAR(ansp))[0] = INTEGER(v)[i];
break;
case REALSXP:
SETCAR(ansp, allocVector(REALSXP, 1));
REAL(CAR(ansp))[0] = REAL(v)[i];
break;
case CPLXSXP:
SETCAR(ansp, allocVector(CPLXSXP, 1));
COMPLEX(CAR(ansp))[0] = COMPLEX(v)[i];
break;
case STRSXP:
SETCAR(ansp, allocVector(STRSXP, 1));
SET_STRING_ELT(CAR(ansp), 0, STRING_ELT(v, i));
break;
case RAWSXP:
SETCAR(ansp, allocVector(RAWSXP, 1));
RAW(CAR(ansp))[0] = RAW(v)[i];
break;
case VECSXP:
SETCAR(ansp, VECTOR_ELT(v, i));
break;
case EXPRSXP:
SETCAR(ansp, VECTOR_ELT(v, i));
break;
default:
UNIMPLEMENTED_TYPE("coerceToPairList", v);
}
ansp = CDR(ansp);
}
ansp = getAttrib(v, R_NamesSymbol);
if (ansp != R_NilValue)
setAttrib(ans, R_NamesSymbol, ansp);
UNPROTECT(1);
return (ans);
}
/* Coerce a list to the given type */
static SEXP coercePairList(SEXP v, SEXPTYPE type)
{
int i, n=0;
SEXP rval= R_NilValue, vp, names;
if(type == LISTSXP) return v;/* IS pairlist */
names = v;
if (type == EXPRSXP) {
PROTECT(rval = allocVector(type, 1));
SET_VECTOR_ELT(rval, 0, v);
UNPROTECT(1);
return rval;
}
else if (type == STRSXP) {
n = length(v);
PROTECT(rval = allocVector(type, n));
for (vp = v, i = 0; vp != R_NilValue; vp = CDR(vp), i++) {
if (isString(CAR(vp)) && length(CAR(vp)) == 1)
SET_STRING_ELT(rval, i, STRING_ELT(CAR(vp), 0));
else
SET_STRING_ELT(rval, i, STRING_ELT(deparse1line(CAR(vp), 0), 0));
}
}
else if (type == VECSXP) {
rval = PairToVectorList(v);
return rval;
}
else if (isVectorizable(v)) {
n = length(v);
PROTECT(rval = allocVector(type, n));
switch (type) {
case LGLSXP:
for (i = 0, vp = v; i < n; i++, vp = CDR(vp))
LOGICAL(rval)[i] = asLogical(CAR(vp));
break;
case INTSXP:
for (i = 0, vp = v; i < n; i++, vp = CDR(vp))
INTEGER(rval)[i] = asInteger(CAR(vp));
break;
case REALSXP:
for (i = 0, vp = v; i < n; i++, vp = CDR(vp))
REAL(rval)[i] = asReal(CAR(vp));
break;
case CPLXSXP:
for (i = 0, vp = v; i < n; i++, vp = CDR(vp))
COMPLEX(rval)[i] = asComplex(CAR(vp));
break;
case RAWSXP:
for (i = 0, vp = v; i < n; i++, vp = CDR(vp))
RAW(rval)[i] = (Rbyte) asInteger(CAR(vp));
break;
default:
UNIMPLEMENTED_TYPE("coercePairList", v);
}
}
else
error(_("'pairlist' object cannot be coerced to '%s'"),
CHAR(type2str(type)));
/* If any tags are non-null then we */
/* need to add a names attribute. */
for (vp = v, i = 0; vp != R_NilValue; vp = CDR(vp))
if (TAG(vp) != R_NilValue)
i = 1;
if (i) {
i = 0;
names = allocVector(STRSXP, n);
for (vp = v; vp != R_NilValue; vp = CDR(vp), i++)
if (TAG(vp) != R_NilValue)
SET_STRING_ELT(names, i, PRINTNAME(TAG(vp)));
setAttrib(rval, R_NamesSymbol, names);
}
UNPROTECT(1);
return rval;
}
static SEXP coerceVectorList(SEXP v, SEXPTYPE type)
{
int i, n, warn = 0, tmp;
SEXP rval, names;
names = v;
rval = R_NilValue; /* -Wall */
if (type == EXPRSXP) {
PROTECT(rval = allocVector(type, 1));
SET_VECTOR_ELT(rval, 0, v);
UNPROTECT(1);
return rval;
}
else if (type == STRSXP) {
n = length(v);
PROTECT(rval = allocVector(type, n));
for (i = 0; i < n; i++) {
if (isString(VECTOR_ELT(v, i)) && length(VECTOR_ELT(v, i)) == 1)
SET_STRING_ELT(rval, i, STRING_ELT(VECTOR_ELT(v, i), 0));
#if 0
/* this will make as.character(list(s)) not backquote
* non-syntactic name s. It is not entirely clear that
* that is really desirable though....
*/
else if (isSymbol(VECTOR_ELT(v, i)))
SET_STRING_ELT(rval, i, PRINTNAME(VECTOR_ELT(v, i)));
#endif
else
SET_STRING_ELT(rval, i,
STRING_ELT(deparse1line(VECTOR_ELT(v, i), 0), 0));
}
}
else if (type == LISTSXP) {
rval = VectorToPairList(v);
return rval;
}
else if (isVectorizable(v)) {
n = length(v);
PROTECT(rval = allocVector(type, n));
switch (type) {
case LGLSXP:
for (i = 0; i < n; i++)
LOGICAL(rval)[i] = asLogical(VECTOR_ELT(v, i));
break;
case INTSXP:
for (i = 0; i < n; i++)
INTEGER(rval)[i] = asInteger(VECTOR_ELT(v, i));
break;
case REALSXP:
for (i = 0; i < n; i++)
REAL(rval)[i] = asReal(VECTOR_ELT(v, i));
break;
case CPLXSXP:
for (i = 0; i < n; i++)
COMPLEX(rval)[i] = asComplex(VECTOR_ELT(v, i));
break;
case RAWSXP:
for (i = 0; i < n; i++) {
tmp = asInteger(VECTOR_ELT(v, i));
if (tmp < 0 || tmp > 255) { /* includes NA_INTEGER */
tmp = 0;
warn |= WARN_RAW;
}
RAW(rval)[i] = (Rbyte) tmp;