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coalesce.c
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#include "data.table.h"
SEXP coalesce(SEXP x, SEXP inplaceArg) {
if (TYPEOF(x)!=VECSXP)
error(_("Internal error in coalesce.c: input is list(...) at R level")); // # nocov
if (!IS_TRUE_OR_FALSE(inplaceArg))
error(_("Internal error in coalesce.c: argument 'inplaceArg' must be TRUE or FALSE")); // # nocov
const bool inplace = LOGICAL(inplaceArg)[0];
const bool verbose = GetVerbose();
int nprotect = 0;
if (length(x)==0 || isNull(VECTOR_ELT(x,0))) return R_NilValue; // coalesce(NULL, "foo") return NULL even though character type mismatches type NULL
SEXP first; // the first vector (it might be the first argument, or it might be the first column of a data.table|frame
int off = 1; // when x has been pointed to the list of replacement candidates, is the first candidate in position 0 or 1 in the list
if (TYPEOF(VECTOR_ELT(x,0)) == VECSXP) {
if (length(x)!=1)
error(_("The first argument is a list, data.table or data.frame. In this case there should be no other arguments provided."));
x = VECTOR_ELT(x,0);
if (length(x)==0) return R_NilValue;
first = VECTOR_ELT(x,0);
} else {
first = VECTOR_ELT(x,0);
if (length(x)>1 && TYPEOF(VECTOR_ELT(x,1))==VECSXP) { x=VECTOR_ELT(x,1); off=0; } // coalesce(x, list(y,z))
}
const int nval = length(x)-off;
if (nval==0) return first;
const bool factor = isFactor(first);
const int nrow = length(first);
for (int i=0; i<nval; ++i) {
SEXP item = VECTOR_ELT(x, i+off);
if (factor) {
if (!isFactor(item))
error(_("Item 1 is a factor but item %d is not a factor. When factors are involved, all items must be factor."), i+2);
if (!R_compute_identical(PROTECT(getAttrib(first, R_LevelsSymbol)), PROTECT(getAttrib(item, R_LevelsSymbol)), 0))
error(_("Item %d is a factor but its levels are not identical to the first item's levels."), i+2);
UNPROTECT(2);
} else {
if (isFactor(item))
error(_("Item %d is a factor but item 1 is not a factor. When factors are involved, all items must be factor."), i+2);
}
if (TYPEOF(first) != TYPEOF(item))
error(_("Item %d is type %s but the first item is type %s. Please coerce before coalescing."), i+2, type2char(TYPEOF(item)), type2char(TYPEOF(first)));
if (!R_compute_identical(PROTECT(getAttrib(first, R_ClassSymbol)), PROTECT(getAttrib(item, R_ClassSymbol)), 0))
error(_("Item %d has a different class than item 1."), i+2);
UNPROTECT(2);
if (length(item)!=1 && length(item)!=nrow)
error(_("Item %d is length %d but the first item is length %d. Only singletons are recycled."), i+2, length(item), nrow);
}
if (!inplace) {
first = PROTECT(copyAsPlain(first)); nprotect++;
if (verbose) Rprintf(_("coalesce copied first item (inplace=FALSE)\n"));
}
void **valP = (void **)R_alloc(nval, sizeof(void *));
switch(TYPEOF(first)) {
case LGLSXP:
case INTSXP: {
int *xP = INTEGER(first), k=0, finalVal=NA_INTEGER;
for (int j=0; j<nval; ++j) {
SEXP item = VECTOR_ELT(x, j+off);
if (length(item)==1) {
int tt = INTEGER(item)[0];
if (tt==NA_INTEGER) continue; // singleton NA can be skipped
finalVal = tt;
break; // stop early on the first singleton that is not NA; minimizes deepest loop body below
}
valP[k++] = INTEGER(item);
}
const bool final=(finalVal!=NA_INTEGER);
#pragma omp parallel for num_threads(getDTthreads(nrow, true))
for (int i=0; i<nrow; ++i) {
int val = xP[i];
if (val!=NA_INTEGER) continue;
int j=0; while (val==NA_INTEGER && j<k) val=((int *)valP[j++])[i]; // k is the number of non-singletons
if (val!=NA_INTEGER) xP[i]=val; else if (final) xP[i]=finalVal;
}
} break;
case REALSXP: {
if (INHERITS(first, char_integer64)) {
int64_t *xP=(int64_t *)REAL(first), finalVal=NA_INTEGER64;
int k=0;
for (int j=0; j<nval; ++j) {
SEXP item = VECTOR_ELT(x, j+off);
if (length(item)==1) {
int64_t tt = ((int64_t *)REAL(item))[0];
if (tt==NA_INTEGER64) continue;
finalVal = tt;
break;
}
valP[k++] = REAL(item);
}
const bool final = (finalVal!=NA_INTEGER64);
#pragma omp parallel for num_threads(getDTthreads(nrow, true))
for (int i=0; i<nrow; ++i) {
int64_t val=xP[i];
if (val!=NA_INTEGER64) continue;
int j=0; while (val==NA_INTEGER64 && j<k) val=((int64_t *)valP[j++])[i];
if (val!=NA_INTEGER64) xP[i]=val; else if (final) xP[i]=finalVal;
}
} else {
double *xP = (double *)REAL(first), finalVal=NA_REAL;
int k=0;
for (int j=0; j<nval; ++j) {
SEXP item = VECTOR_ELT(x, j+off);
if (length(item)==1) {
double tt = REAL(item)[0];
if (ISNAN(tt)) continue;
finalVal = tt;
break;
}
valP[k++] = REAL(item);
}
const bool final = !ISNAN(finalVal);
#pragma omp parallel for num_threads(getDTthreads(nrow, true))
for (int i=0; i<nrow; ++i) {
double val=xP[i];
if (!ISNAN(val)) continue;
int j=0; while (ISNAN(val) && j<k) val=((double *)valP[j++])[i];
if (!ISNAN(val)) xP[i]=val; else if (final) xP[i]=finalVal;
}
}
} break;
case CPLXSXP: {
Rcomplex *xP = COMPLEX(first), finalVal=NA_CPLX;
int k=0;
for (int j=0; j<nval; ++j) {
SEXP item = VECTOR_ELT(x, j+off);
if (length(item)==1) {
Rcomplex tt = COMPLEX(item)[0];
if (ISNAN(tt.r) && ISNAN(tt.i)) continue;
finalVal = tt;
break;
}
valP[k++] = COMPLEX(item);
}
const bool final = !ISNAN(finalVal.r) && !ISNAN(finalVal.i);
#pragma omp parallel for num_threads(getDTthreads(nrow, true))
for (int i=0; i<nrow; ++i) {
Rcomplex val=xP[i];
if (!ISNAN(val.r) && !ISNAN(val.i)) continue;
int j=0; while (ISNAN(val.r) && ISNAN(val.i) && j<k) val=((Rcomplex *)valP[j++])[i];
if (!ISNAN(val.r) || !ISNAN(val.i)) xP[i]=val; else if (final) xP[i]=finalVal;
}
} break;
case STRSXP: {
const SEXP *xP = STRING_PTR(first);
SEXP finalVal=NA_STRING;
int k=0;
for (int j=0; j<nval; ++j) {
SEXP item = VECTOR_ELT(x, j+off);
if (length(item)==1) {
SEXP tt = STRING_ELT(item,0);
if (tt==NA_STRING) continue;
finalVal = tt;
break;
}
valP[k++] = STRING_PTR(item);
}
const bool final = (finalVal!=NA_STRING);
for (int i=0; i<nrow; ++i) {
SEXP val = xP[i];
if (val!=NA_STRING) continue;
int j=0; while (val==NA_STRING && j<k) val=((SEXP *)valP[j++])[i];
if (val!=NA_STRING) SET_STRING_ELT(first, i, val); else if (final) SET_STRING_ELT(first, i, finalVal);
}
} break;
default:
error(_("Type '%s' is not supported"), type2char(TYPEOF(first))); // e.g. raw is tested
}
UNPROTECT(nprotect);
return first;
}