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attrib.c
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/*
* R : A Computer Language for Statistical Data Analysis
* Copyright (C) 1997--2021 The R Core Team
* 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, a copy is available at
* https://www.R-project.org/Licenses/
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <Defn.h>
#include <Internal.h>
#include <Rmath.h>
static SEXP installAttrib(SEXP, SEXP, SEXP);
static SEXP removeAttrib(SEXP, SEXP);
SEXP comment(SEXP);
static SEXP commentgets(SEXP, SEXP);
static SEXP row_names_gets(SEXP vec, SEXP val)
{
SEXP ans;
if (vec == R_NilValue)
error(_("attempt to set an attribute on NULL"));
if(isReal(val) && LENGTH(val) == 2 && ISNAN(REAL(val)[0]) ) {
/* This should not happen, but if a careless user dput()s a
data frame and sources the result, it will */
PROTECT(vec);
PROTECT(val);
val = coerceVector(val, INTSXP);
UNPROTECT(1); /* val */
PROTECT(val);
ans = installAttrib(vec, R_RowNamesSymbol, val);
UNPROTECT(2); /* vec, val */
return ans;
}
if(isInteger(val)) {
Rboolean OK_compact = TRUE;
int i, n = LENGTH(val);
if(n == 2 && INTEGER(val)[0] == NA_INTEGER) {
n = INTEGER(val)[1];
} else if (n > 2) {
for(i = 0; i < n; i++)
if(INTEGER(val)[i] != i+1) {
OK_compact = FALSE;
break;
}
} else OK_compact = FALSE;
if(OK_compact) {
/* we hide the length in an impossible integer vector */
PROTECT(vec);
PROTECT(val = allocVector(INTSXP, 2));
INTEGER(val)[0] = NA_INTEGER;
INTEGER(val)[1] = n; // +n: compacted *and* automatic row names
ans = installAttrib(vec, R_RowNamesSymbol, val);
UNPROTECT(2); /* vec, val */
return ans;
}
} else if(!isString(val))
error(_("row names must be 'character' or 'integer', not '%s'"),
type2char(TYPEOF(val)));
PROTECT(vec);
PROTECT(val);
ans = installAttrib(vec, R_RowNamesSymbol, val);
UNPROTECT(2); /* vec, val */
return ans;
}
/* used in removeAttrib, commentgets and classgets */
static SEXP stripAttrib(SEXP tag, SEXP lst)
{
if(lst == R_NilValue) return lst;
if(tag == TAG(lst)) return stripAttrib(tag, CDR(lst));
SETCDR(lst, stripAttrib(tag, CDR(lst)));
return lst;
}
static Rboolean isOneDimensionalArray(SEXP vec)
{
if(isVector(vec) || isList(vec) || isLanguage(vec)) {
SEXP s = getAttrib(vec, R_DimSymbol);
if(TYPEOF(s) == INTSXP && LENGTH(s) == 1)
return TRUE;
}
return FALSE;
}
/* NOTE: For environments serialize.c calls this function to find if
there is a class attribute in order to reconstruct the object bit
if needed. This means the function cannot use OBJECT(vec) == 0 to
conclude that the class attribute is R_NilValue. If you want to
rewrite this function to use such a pre-test, be sure to adjust
serialize.c accordingly. LT */
SEXP attribute_hidden getAttrib0(SEXP vec, SEXP name)
{
SEXP s;
if (name == R_NamesSymbol) {
if(isOneDimensionalArray(vec)) {
s = getAttrib(vec, R_DimNamesSymbol);
if(!isNull(s)) {
MARK_NOT_MUTABLE(VECTOR_ELT(s, 0));
return VECTOR_ELT(s, 0);
}
}
if (isList(vec) || isLanguage(vec) || TYPEOF(vec) == DOTSXP) {
int len = length(vec);
PROTECT(s = allocVector(STRSXP, len));
int i = 0;
Rboolean any = FALSE;
for ( ; vec != R_NilValue; vec = CDR(vec), i++) {
if (TAG(vec) == R_NilValue)
{
SET_STRING_ELT(s, i, R_BlankString);
}
else if (isSymbol(TAG(vec))) {
any = TRUE;
SET_STRING_ELT(s, i, PRINTNAME(TAG(vec)));
}
else
error(_("getAttrib: invalid type (%s) for TAG"),
type2char(TYPEOF(TAG(vec))));
}
UNPROTECT(1);
if (any) {
if (!isNull(s)) MARK_NOT_MUTABLE(s);
return (s);
} else
return R_NilValue;
}
}
for (s = ATTRIB(vec); s != R_NilValue; s = CDR(s))
if (TAG(s) == name) {
if (name == R_DimNamesSymbol && TYPEOF(CAR(s)) == LISTSXP)
error("old list is no longer allowed for dimnames attribute");
/**** this could be dropped for REFCNT or be less
stringent for NAMED for attributes where the setter
does not have a consistency check that could fail
after mutation in a complex assignment LT */
MARK_NOT_MUTABLE(CAR(s));
return CAR(s);
}
return R_NilValue;
}
SEXP getAttrib(SEXP vec, SEXP name)
{
if(TYPEOF(vec) == CHARSXP)
error("cannot have attributes on a CHARSXP");
/* pre-test to avoid expensive operations if clearly not needed -- LT */
if (ATTRIB(vec) == R_NilValue &&
! (TYPEOF(vec) == LISTSXP || TYPEOF(vec) == LANGSXP|| TYPEOF(vec) == DOTSXP))
return R_NilValue;
if (isString(name)) name = installTrChar(STRING_ELT(name, 0));
/* special test for c(NA, n) rownames of data frames: */
if (name == R_RowNamesSymbol) {
SEXP s = getAttrib0(vec, R_RowNamesSymbol);
if(isInteger(s) && LENGTH(s) == 2 && INTEGER(s)[0] == NA_INTEGER) {
int n = abs(INTEGER(s)[1]);
if (n > 0)
s = R_compact_intrange(1, n);
else
s = allocVector(INTSXP, 0);
}
return s;
} else
return getAttrib0(vec, name);
}
// R's .row_names_info(x, type = 1L) := .Internal(shortRowNames(x, type)) :
attribute_hidden
SEXP do_shortRowNames(SEXP call, SEXP op, SEXP args, SEXP env)
{
/* return n if the data frame 'vec' has c(NA, n) rownames;
* nrow(.) otherwise; note that data frames with nrow(.) == 0
* have no row.names.
==> is also used in dim.data.frame() */
checkArity(op, args);
SEXP s = getAttrib0(CAR(args), R_RowNamesSymbol), ans = s;
int type = asInteger(CADR(args));
if( type < 0 || type > 2)
error(_("invalid '%s' argument"), "type");
if(type >= 1) {
int n = (isInteger(s) && LENGTH(s) == 2 && INTEGER(s)[0] == NA_INTEGER)
? INTEGER(s)[1] : (isNull(s) ? 0 : LENGTH(s));
ans = ScalarInteger((type == 1) ? n : abs(n));
}
return ans;
}
// .Internal(copyDFattr(in, out)) -- is allowed to change 'out' (!!)
attribute_hidden
SEXP do_copyDFattr(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
SEXP in = CAR(args), out = CADR(args);
SET_ATTRIB(out, shallow_duplicate(ATTRIB(in)));
IS_S4_OBJECT(in) ? SET_S4_OBJECT(out) : UNSET_S4_OBJECT(out);
SET_OBJECT(out, OBJECT(in));
return out;
}
/* 'name' should be 1-element STRSXP or SYMSXP */
SEXP setAttrib(SEXP vec, SEXP name, SEXP val)
{
PROTECT(vec);
PROTECT(name);
if (isString(name)) {
PROTECT(val);
name = installTrChar(STRING_ELT(name, 0));
UNPROTECT(1);
}
if (val == R_NilValue) {
/* FIXME: see do_namesgets().
if (name == R_NamesSymbol && isOneDimensionalArray(vec)) {
UNPROTECT(2);
return removeAttrib(vec, R_DimNamesSymbol);
}
*/
UNPROTECT(2);
return removeAttrib(vec, name);
}
/* We allow attempting to remove names from NULL */
if (vec == R_NilValue)
error(_("attempt to set an attribute on NULL"));
UNPROTECT(2);
if (name == R_NamesSymbol)
return namesgets(vec, val);
else if (name == R_DimSymbol)
return dimgets(vec, val);
else if (name == R_DimNamesSymbol)
return dimnamesgets(vec, val);
else if (name == R_ClassSymbol)
return classgets(vec, val);
else if (name == R_TspSymbol)
return tspgets(vec, val);
else if (name == R_CommentSymbol)
return commentgets(vec, val);
else if (name == R_RowNamesSymbol) // "row.names" -> care for data frames
return row_names_gets(vec, val);
else
return installAttrib(vec, name, val);
}
/* This is called in the case of binary operations to copy */
/* most attributes from (one of) the input arguments to */
/* the output. Note that the Dim and Names attributes */
/* should have been assigned elsewhere. */
void copyMostAttrib(SEXP inp, SEXP ans)
{
SEXP s;
if (ans == R_NilValue)
error(_("attempt to set an attribute on NULL"));
PROTECT(ans);
PROTECT(inp);
for (s = ATTRIB(inp); s != R_NilValue; s = CDR(s)) {
if ((TAG(s) != R_NamesSymbol) &&
(TAG(s) != R_DimSymbol) &&
(TAG(s) != R_DimNamesSymbol)) { // << for matrix, array ..
installAttrib(ans, TAG(s), CAR(s));
}
}
if (OBJECT(inp)) SET_OBJECT(ans, 1);
IS_S4_OBJECT(inp) ? SET_S4_OBJECT(ans) : UNSET_S4_OBJECT(ans);
UNPROTECT(2);
}
/* version that does not preserve ts information, for subsetting */
void copyMostAttribNoTs(SEXP inp, SEXP ans)
{
SEXP s;
int is_object = OBJECT(inp);
int is_s4_object = IS_S4_OBJECT(inp);
if (ans == R_NilValue)
error(_("attempt to set an attribute on NULL"));
PROTECT(ans);
PROTECT(inp);
for (s = ATTRIB(inp); s != R_NilValue; s = CDR(s)) {
if ((TAG(s) != R_NamesSymbol) &&
(TAG(s) != R_ClassSymbol) &&
(TAG(s) != R_TspSymbol) &&
(TAG(s) != R_DimSymbol) &&
(TAG(s) != R_DimNamesSymbol)) {
installAttrib(ans, TAG(s), CAR(s));
} else if (TAG(s) == R_ClassSymbol) {
SEXP cl = CAR(s);
int i;
Rboolean ists = FALSE;
for (i = 0; i < LENGTH(cl); i++)
if (strcmp(CHAR(STRING_ELT(cl, i)), "ts") == 0) { /* ASCII */
ists = TRUE;
break;
}
if (!ists) installAttrib(ans, TAG(s), cl);
else if(LENGTH(cl) <= 1) {
/* dropping class attribute */
is_object = 0;
is_s4_object = 0;
} else {
SEXP new_cl;
int i, j, l = LENGTH(cl);
PROTECT(new_cl = allocVector(STRSXP, l - 1));
for (i = 0, j = 0; i < l; i++)
if (strcmp(CHAR(STRING_ELT(cl, i)), "ts")) /* ASCII */
SET_STRING_ELT(new_cl, j++, STRING_ELT(cl, i));
installAttrib(ans, TAG(s), new_cl);
UNPROTECT(1);
}
}
}
SET_OBJECT(ans, is_object);
is_s4_object ? SET_S4_OBJECT(ans) : UNSET_S4_OBJECT(ans);
UNPROTECT(2);
}
/* Tweaks here based in part on PR#14934 */
static SEXP installAttrib(SEXP vec, SEXP name, SEXP val)
{
SEXP t = R_NilValue; /* -Wall */
if(TYPEOF(vec) == CHARSXP)
error("cannot set attribute on a CHARSXP");
if (TYPEOF(vec) == SYMSXP)
error(_("cannot set attribute on a symbol"));
/* this does no allocation */
for (SEXP s = ATTRIB(vec); s != R_NilValue; s = CDR(s)) {
if (TAG(s) == name) {
if (MAYBE_REFERENCED(val) && val != CAR(s))
val = R_FixupRHS(vec, val);
SETCAR(s, val);
return val;
}
t = s; // record last attribute, if any
}
/* The usual convention is that the caller protects,
but a lot of existing code depends assume that
setAttrib/installAttrib protects its arguments */
PROTECT(vec); PROTECT(name); PROTECT(val);
if (MAYBE_REFERENCED(val)) ENSURE_NAMEDMAX(val);
SEXP s = CONS(val, R_NilValue);
SET_TAG(s, name);
if (ATTRIB(vec) == R_NilValue) SET_ATTRIB(vec, s); else SETCDR(t, s);
UNPROTECT(3);
return val;
}
static SEXP removeAttrib(SEXP vec, SEXP name)
{
SEXP t;
if(TYPEOF(vec) == CHARSXP)
error("cannot set attribute on a CHARSXP");
if (name == R_NamesSymbol && isPairList(vec)) {
for (t = vec; t != R_NilValue; t = CDR(t))
SET_TAG(t, R_NilValue);
return R_NilValue;
}
else {
if (name == R_DimSymbol)
SET_ATTRIB(vec, stripAttrib(R_DimNamesSymbol, ATTRIB(vec)));
SET_ATTRIB(vec, stripAttrib(name, ATTRIB(vec)));
if (name == R_ClassSymbol)
SET_OBJECT(vec, 0);
}
return R_NilValue;
}
static void checkNames(SEXP x, SEXP s)
{
if (isVector(x) || isList(x) || isLanguage(x)) {
if (!isVector(s) && !isList(s))
error(_("invalid type (%s) for 'names': must be vector or NULL"),
type2char(TYPEOF(s)));
if (xlength(x) != xlength(s))
error(_("'names' attribute [%d] must be the same length as the vector [%d]"), length(s), length(x));
}
else if(IS_S4_OBJECT(x)) {
/* leave validity checks to S4 code */
}
else error(_("names() applied to a non-vector"));
}
/* Time Series Parameters */
static void NORET badtsp(void)
{
error(_("invalid time series parameters specified"));
}
attribute_hidden
SEXP tspgets(SEXP vec, SEXP val)
{
double start, end, frequency;
int n;
if (vec == R_NilValue)
error(_("attempt to set an attribute on NULL"));
if(IS_S4_OBJECT(vec)) { /* leave validity checking to validObject */
if (!isNumeric(val)) /* but should have been checked */
error(_("'tsp' attribute must be numeric"));
installAttrib(vec, R_TspSymbol, val);
return vec;
}
if (!isNumeric(val) || LENGTH(val) != 3)
error(_("'tsp' attribute must be numeric of length three"));
if (isReal(val)) {
start = REAL(val)[0];
end = REAL(val)[1];
frequency = REAL(val)[2];
}
else {
start = (INTEGER(val)[0] == NA_INTEGER) ?
NA_REAL : INTEGER(val)[0];
end = (INTEGER(val)[1] == NA_INTEGER) ?
NA_REAL : INTEGER(val)[1];
frequency = (INTEGER(val)[2] == NA_INTEGER) ?
NA_REAL : INTEGER(val)[2];
}
if (frequency <= 0) badtsp();
n = nrows(vec);
if (n == 0) error(_("cannot assign 'tsp' to zero-length vector"));
/* FIXME: 1.e-5 should rather be == option('ts.eps') !! */
if (fabs(end - start - (n - 1)/frequency) > 1.e-5)
badtsp();
PROTECT(vec);
val = allocVector(REALSXP, 3);
PROTECT(val);
REAL(val)[0] = start;
REAL(val)[1] = end;
REAL(val)[2] = frequency;
installAttrib(vec, R_TspSymbol, val);
UNPROTECT(2);
return vec;
}
static SEXP commentgets(SEXP vec, SEXP comment)
{
if (vec == R_NilValue)
error(_("attempt to set an attribute on NULL"));
if (isNull(comment) || isString(comment)) {
if (length(comment) <= 0) {
SET_ATTRIB(vec, stripAttrib(R_CommentSymbol, ATTRIB(vec)));
}
else {
installAttrib(vec, R_CommentSymbol, comment);
}
return R_NilValue;
}
error(_("attempt to set invalid 'comment' attribute"));
return R_NilValue;/*- just for -Wall */
}
SEXP attribute_hidden do_commentgets(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
if (MAYBE_SHARED(CAR(args))) SETCAR(args, duplicate(CAR(args)));
if (length(CADR(args)) == 0) SETCADR(args, R_NilValue);
setAttrib(CAR(args), R_CommentSymbol, CADR(args));
SETTER_CLEAR_NAMED(CAR(args));
return CAR(args);
}
SEXP attribute_hidden do_comment(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
return getAttrib(CAR(args), R_CommentSymbol);
}
/* *Not* called from class(.) <- v, nor oldClass(.) <- v, but
* e.g. from attr(x, "class") <- value plus our own C, e.g. ./connections.c
*/
SEXP classgets(SEXP vec, SEXP klass)
{
if (isNull(klass) || isString(klass)) {
int ncl = length(klass);
if (ncl <= 0) {
SET_ATTRIB(vec, stripAttrib(R_ClassSymbol, ATTRIB(vec)));
SET_OBJECT(vec, 0);
// problems when package building: UNSET_S4_OBJECT(vec);
}
else {
/* When data frames were a special data type */
/* we had more exhaustive checks here. Now that */
/* use JMCs interpreted code, we don't need this */
/* FIXME : The whole "classgets" may as well die. */
/* HOWEVER, it is the way that the object bit gets set/unset */
Rboolean isfactor = FALSE;
if (vec == R_NilValue)
error(_("attempt to set an attribute on NULL"));
for(int i = 0; i < ncl; i++)
if(streql(CHAR(STRING_ELT(klass, i)), "factor")) { /* ASCII */
isfactor = TRUE;
break;
}
if(isfactor && TYPEOF(vec) != INTSXP) {
/* we cannot coerce vec here, so just fail */
error(_("adding class \"factor\" to an invalid object"));
}
installAttrib(vec, R_ClassSymbol, klass);
SET_OBJECT(vec, 1);
#ifdef R_classgets_copy_S4
// not ok -- fails at installation around byte-compiling methods
if(ncl == 1 && R_has_methods_attached()) { // methods: do not act too early
SEXP cld = R_getClassDef_R(klass);
if(!isNull(cld)) {
PROTECT(cld);
/* More efficient? can we protect? -- rather *assign* in method-ns?
static SEXP oldCl = NULL;
if(!oldCl) oldCl = R_getClassDef("oldClass");
if(!oldCl) oldCl = mkString("oldClass");
PROTECT(oldCl);
*/
if(!R_isVirtualClass(cld, R_MethodsNamespace) &&
!R_extends(cld, mkString("oldClass"), R_MethodsNamespace)) // set S4 bit :
// !R_extends(cld, oldCl, R_MethodsNamespace)) // set S4 bit :
SET_S4_OBJECT(vec);
UNPROTECT(1); // UNPROTECT(2);
}
}
#endif
}
}
else
error(_("attempt to set invalid 'class' attribute"));
return R_NilValue;
}
/* oldClass<-(), primitive */
SEXP attribute_hidden do_classgets(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
// have 2 args: check1arg(args, call, "x");
if (MAYBE_SHARED(CAR(args)) ||
((! IS_ASSIGNMENT_CALL(call)) && MAYBE_REFERENCED(CAR(args))))
SETCAR(args, shallow_duplicate(CAR(args)));
if (length(CADR(args)) == 0) SETCADR(args, R_NilValue);
if(IS_S4_OBJECT(CAR(args)))
UNSET_S4_OBJECT(CAR(args));
setAttrib(CAR(args), R_ClassSymbol, CADR(args));
SETTER_CLEAR_NAMED(CAR(args));
return CAR(args);
}
// oldClass, primitive -- NB: class() |=> R_do_data_class() |=> R_data_class()
SEXP attribute_hidden do_class(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
check1arg(args, call, "x");
SEXP x = CAR(args), s3class;
if(IS_S4_OBJECT(x)) {
if((s3class = S3Class(x)) != R_NilValue) {
return s3class;
}
} /* else */
return getAttrib(x, R_ClassSymbol);
}
/* character elements corresponding to the syntactic types in the
grammar */
static SEXP lang2str(SEXP obj, SEXPTYPE t)
{
SEXP symb = CAR(obj);
static SEXP if_sym = 0, while_sym, for_sym, eq_sym, gets_sym,
lpar_sym, lbrace_sym, call_sym;
if(!if_sym) {
/* initialize: another place for a hash table */
if_sym = install("if");
while_sym = install("while");
for_sym = install("for");
eq_sym = install("=");
gets_sym = install("<-");
lpar_sym = install("(");
lbrace_sym = install("{");
call_sym = install("call");
}
if(isSymbol(symb)) {
if(symb == if_sym || symb == for_sym || symb == while_sym ||
symb == lpar_sym || symb == lbrace_sym ||
symb == eq_sym || symb == gets_sym)
return PRINTNAME(symb);
}
return PRINTNAME(call_sym);
}
/* the S4-style class: for dispatch required to be a single string;
for the new class() function;
if(!singleString) , keeps S3-style multiple classes.
Called from the methods package, so exposed.
*/
SEXP R_data_class(SEXP obj, Rboolean singleString)
{
SEXP value, klass = getAttrib(obj, R_ClassSymbol);
int n = length(klass);
if(n == 1 || (n > 0 && !singleString))
return(klass);
if(n == 0) {
SEXP dim = getAttrib(obj, R_DimSymbol);
int nd = length(dim);
if(nd > 0) {
if(nd == 2) {
if(singleString)
klass = mkChar("matrix");
else { // R >= 4.0.0 : class(<matrix>) |-> c("matrix", "array")
PROTECT(klass = allocVector(STRSXP, 2));
SET_STRING_ELT(klass, 0, mkChar("matrix"));
SET_STRING_ELT(klass, 1, mkChar("array"));
UNPROTECT(1);
return klass;
}
}
else
klass = mkChar("array");
}
else {
SEXPTYPE t = TYPEOF(obj);
switch(t) {
case CLOSXP: case SPECIALSXP: case BUILTINSXP:
klass = mkChar("function");
break;
case REALSXP:
klass = mkChar("numeric");
break;
case SYMSXP:
klass = mkChar("name");
break;
case LANGSXP:
klass = lang2str(obj, t);
break;
default:
klass = type2str(t);
}
}
}
else
klass = asChar(klass);
PROTECT(klass);
value = ScalarString(klass);
UNPROTECT(1);
return value;
}
static SEXP s_dot_S3Class = 0;
static SEXP R_S4_extends_table = 0;
static SEXP cache_class(const char *class, SEXP klass)
{
if(!R_S4_extends_table) {
R_S4_extends_table = R_NewHashedEnv(R_NilValue, ScalarInteger(0));
R_PreserveObject(R_S4_extends_table);
}
if(isNull(klass)) {
R_removeVarFromFrame(install(class), R_S4_extends_table);
} else {
defineVar(install(class), klass, R_S4_extends_table);
}
return klass;
}
static SEXP S4_extends(SEXP klass, Rboolean use_tab) {
static SEXP s_extends = 0, s_extendsForS3;
SEXP e, val; const char *class;
const void *vmax;
if(use_tab) vmax = vmaxget();
if(!s_extends) {
s_extends = install("extends");
s_extendsForS3 = install(".extendsForS3");
R_S4_extends_table = R_NewHashedEnv(R_NilValue, ScalarInteger(0));
R_PreserveObject(R_S4_extends_table);
}
if(!isMethodsDispatchOn()) {
return klass;
}
class = translateChar(STRING_ELT(klass, 0)); /* TODO: include package attr. */
if(use_tab) {
val = findVarInFrame(R_S4_extends_table, install(class));
vmaxset(vmax);
if(val != R_UnboundValue)
return val;
}
// else: val <- .extendsForS3(klass) -- and cache it
PROTECT(e = allocVector(LANGSXP, 2));
SETCAR(e, s_extendsForS3);
val = CDR(e);
SETCAR(val, klass);
PROTECT(val = eval(e, R_MethodsNamespace));
cache_class(class, val);
UNPROTECT(2); /* val, e */
return(val);
}
SEXP R_S4_extends(SEXP klass, SEXP useTable)
{
return S4_extends(klass, asLogical(useTable));
}
/* pre-allocated default class attributes */
static struct {
SEXP vector;
SEXP matrix;
SEXP array;
} Type2DefaultClass[MAX_NUM_SEXPTYPE];
static SEXP createDefaultClass(SEXP part1, SEXP part2, SEXP part3, SEXP part4)
{
int size = 0;
if (part1 != R_NilValue) size++;
if (part2 != R_NilValue) size++;
if (part3 != R_NilValue) size++;
if (part4 != R_NilValue) size++;
if (size == 0 || part3 == R_NilValue) // .. ?
return R_NilValue;
SEXP res = allocVector(STRSXP, size);
R_PreserveObject(res);
int i = 0;
if (part1 != R_NilValue) SET_STRING_ELT(res, i++, part1);
if (part2 != R_NilValue) SET_STRING_ELT(res, i++, part2);
if (part3 != R_NilValue) SET_STRING_ELT(res, i++, part3);
if (part4 != R_NilValue) SET_STRING_ELT(res, i, part4);
MARK_NOT_MUTABLE(res);
return res;
}
// called when R's main loop is setup :
attribute_hidden
void InitS3DefaultTypes(void)
{
for(int type = 0; type < MAX_NUM_SEXPTYPE; type++) {
SEXP part3 = R_NilValue;
SEXP part4 = R_NilValue;
int nprotected = 0;
switch(type) {
case CLOSXP:
case SPECIALSXP:
case BUILTINSXP:
part3 = PROTECT(mkChar("function"));
nprotected++;
break;
case INTSXP:
case REALSXP:
part3 = PROTECT(type2str_nowarn(type));
part4 = PROTECT(mkChar("numeric"));
nprotected += 2;
break;
case LANGSXP:
/* part3 remains R_NilValue: default type cannot be
pre-allocated, as it depends on the object value */
break;
case SYMSXP:
part3 = PROTECT(mkChar("name"));
nprotected++;
break;
default:
part3 = PROTECT(type2str_nowarn(type));
nprotected++;
}
Type2DefaultClass[type].vector =
createDefaultClass(R_NilValue, R_NilValue, part3, part4);
SEXP part2 = PROTECT(mkChar("array"));
SEXP part1 = PROTECT(mkChar("matrix"));
nprotected += 2;
Type2DefaultClass[type].matrix =
createDefaultClass(part1, part2, part3, part4);
Type2DefaultClass[type].array =
createDefaultClass(R_NilValue, part2, part3, part4);
UNPROTECT(nprotected);
}
}
/* Version for S3-dispatch */
SEXP attribute_hidden R_data_class2 (SEXP obj)
{
SEXP klass = getAttrib(obj, R_ClassSymbol);
if(length(klass) > 0) {
if(IS_S4_OBJECT(obj))
return S4_extends(klass, TRUE);
else
return klass;
}
else { // length(klass) == 0 , i.e., no class *attribute*: attr(obj, "class") is NULL
SEXP dim = getAttrib(obj, R_DimSymbol);
int n = length(dim);
SEXPTYPE t = TYPEOF(obj);
SEXP defaultClass;
switch(n) {
case 0: defaultClass = Type2DefaultClass[t].vector; break;
case 2: defaultClass = Type2DefaultClass[t].matrix; break;
default: defaultClass = Type2DefaultClass[t].array; break;
}
if (defaultClass != R_NilValue) {
return defaultClass;
}
/* now t == LANGSXP, but check to make sure */
if (t != LANGSXP)
error("type must be LANGSXP at this point");
if (n == 0) {
return ScalarString(lang2str(obj, t));
}
/* Where on earth is this ever needed ??
* __FIXME / TODO__ ??
* warning("R_data_class2(<LANGSXP with \"dim\" attribute>) .. please report!");
*/
int I_mat = (n == 2) ? 1 : 0,
nprot = 2; /* part1, defaultClass */
defaultClass = PROTECT(allocVector(STRSXP, 2 + I_mat));
SEXP part1 = PROTECT(mkChar("array")), part2;
SET_STRING_ELT(defaultClass, 0, part1);
if (n == 2) {
part2 = PROTECT(mkChar("matrix")); nprot++;
SET_STRING_ELT(defaultClass, 1, part2);
}
SET_STRING_ELT(defaultClass, 1+I_mat, lang2str(obj, t));
UNPROTECT(nprot);
return defaultClass;
}
}
// class(x) & .cache_class(classname, extendsForS3(.)) {called from methods} & .class2() :
SEXP attribute_hidden R_do_data_class(SEXP call, SEXP op, SEXP args, SEXP env)
{
checkArity(op, args);
if(PRIMVAL(op) == 1) { // .cache_class() - typically re-defining existing cache
check1arg(args, call, "class");
SEXP klass = CAR(args);
if(TYPEOF(klass) != STRSXP || LENGTH(klass) < 1)
error("invalid class argument to internal .class_cache");
const char *class = translateChar(STRING_ELT(klass, 0));
return cache_class(class, CADR(args));
}
check1arg(args, call, "x");
if(PRIMVAL(op) == 2)
// .class2()
return R_data_class2(CAR(args));
// class():
return R_data_class(CAR(args), FALSE);
}
/* names(object) <- name */
SEXP attribute_hidden do_namesgets(SEXP call, SEXP op, SEXP args, SEXP env)
{
SEXP ans;
checkArity(op, args);
// 2 args ("x", "value")
/* DispatchOrEval internal generic: names<- */
if (DispatchOrEval(call, op, "names<-", args, env, &ans, 0, 1))
return(ans);
/* Special case: removing non-existent names, to avoid a copy */
if (CADR(args) == R_NilValue &&
getAttrib(CAR(args), R_NamesSymbol) == R_NilValue)
return CAR(args);
PROTECT(args = ans);
if (MAYBE_SHARED(CAR(args)) ||
((! IS_ASSIGNMENT_CALL(call)) && MAYBE_REFERENCED(CAR(args))))
SETCAR(args, R_shallow_duplicate_attr(CAR(args)));
if (TYPEOF(CAR(args)) == S4SXP) {
const char *klass = CHAR(STRING_ELT(R_data_class(CAR(args), FALSE), 0));
error(_("invalid to use names()<- on an S4 object of class '%s'"),
klass);
}
SEXP names = CADR(args);
if (names != R_NilValue &&
! (TYPEOF(names) == STRSXP && ATTRIB(names) == R_NilValue)) {
PROTECT(call = allocList(2));
SET_TYPEOF(call, LANGSXP);
SETCAR(call, R_AsCharacterSymbol);
SETCADR(call, names);
names = eval(call, env);
SETCADR(call, R_NilValue); /* decrements REFCNT on names */
UNPROTECT(1);
}
/* FIXME:
Need to special-case names(x) <- NULL for 1-d arrays to perform
setAttrib(x, R_DimNamesSymbol, R_NilValue)
(and remove the dimnames) here if we want
setAttrib(x, R_NamesSymbol, R_NilValue)
to actually remove the names, as needed in subset.c.
*/
if(names == R_NilValue && isOneDimensionalArray(CAR(args)))
setAttrib(CAR(args), R_DimNamesSymbol, names);
else
setAttrib(CAR(args), R_NamesSymbol, names);
UNPROTECT(1);
SETTER_CLEAR_NAMED(CAR(args));
return CAR(args);
}
SEXP namesgets(SEXP vec, SEXP val)
{
int i;
SEXP s, rval, tval;
PROTECT(vec);
PROTECT(val);
/* Ensure that the labels are indeed */
/* a vector of character strings */
if (isList(val)) {
if (!isVectorizable(val))
error(_("incompatible 'names' argument"));
else {
rval = allocVector(STRSXP, length(vec));
PROTECT(rval);
/* See PR#10807 */
for (i = 0, tval = val;
i < length(vec) && tval != R_NilValue;
i++, tval = CDR(tval)) {
s = coerceVector(CAR(tval), STRSXP);
SET_STRING_ELT(rval, i, STRING_ELT(s, 0));
}
UNPROTECT(1);
val = rval;
}
} else val = coerceVector(val, STRSXP);
UNPROTECT(1);
PROTECT(val);
/* Check that the lengths and types are compatible */
if (xlength(val) < xlength(vec)) {
val = xlengthgets(val, xlength(vec));
UNPROTECT(1);
PROTECT(val);
}
checkNames(vec, val);
/* Special treatment for one dimensional arrays */
if(isOneDimensionalArray(vec)) {
PROTECT(val = CONS(val, R_NilValue));
setAttrib(vec, R_DimNamesSymbol, val);
UNPROTECT(3);
return vec;
}
if (isList(vec) || isLanguage(vec)) {
/* Cons-cell based objects */
i = 0;