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filter.cpp
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filter.cpp
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#include "dplyr.h"
namespace dplyr {
static inline
void stop_filter_incompatible_size(R_xlen_t i,
SEXP quos,
R_xlen_t nres,
R_xlen_t n) {
DPLYR_ERROR_INIT(3);
DPLYR_ERROR_SET(0, "index", Rf_ScalarInteger(i + 1));
DPLYR_ERROR_SET(1, "size", Rf_ScalarInteger(nres));
DPLYR_ERROR_SET(2, "expected_size", Rf_ScalarInteger(n));
DPLYR_ERROR_THROW("dplyr:::filter_incompatible_size");
}
static inline
void stop_filter_incompatible_type(R_xlen_t i,
SEXP quos,
SEXP column_name,
SEXP result){
DPLYR_ERROR_INIT(3);
DPLYR_ERROR_SET(0, "index", Rf_ScalarInteger(i + 1));
DPLYR_ERROR_SET(1, "column_name", column_name);
DPLYR_ERROR_SET(2, "result", result);
DPLYR_ERROR_THROW("dplyr:::filter_incompatible_type");
}
static inline
void signal_filter(const char* cls) {
SEXP ffi_cls = PROTECT(Rf_mkString(cls));
SEXP ffi_call = PROTECT(Rf_lang2(dplyr::symbols::dplyr_internal_signal, ffi_cls));
Rf_eval(ffi_call, dplyr::envs::ns_dplyr);
UNPROTECT(2);
}
static
void signal_filter_one_column_matrix() {
signal_filter("dplyr:::signal_filter_one_column_matrix");
}
static
void signal_filter_across() {
signal_filter("dplyr:::signal_filter_across");
}
static
void signal_filter_data_frame() {
signal_filter("dplyr:::signal_filter_data_frame");
}
}
// Reduces using logical `&`
static inline
void filter_lgl_reduce(SEXP x, R_xlen_t n, int* p_reduced) {
const R_xlen_t n_x = Rf_xlength(x);
const int* p_x = LOGICAL_RO(x);
if (n_x == 1) {
if (p_x[0] != TRUE) {
for (R_xlen_t i = 0; i < n; ++i) {
p_reduced[i] = FALSE;
}
}
} else {
for (R_xlen_t i = 0; i < n; ++i) {
p_reduced[i] = (p_reduced[i] == TRUE) && (p_x[i] == TRUE);
}
}
}
static inline
bool filter_is_valid_lgl(SEXP x, bool first) {
if (TYPEOF(x) != LGLSXP) {
return false;
}
SEXP dim = PROTECT(Rf_getAttrib(x, R_DimSymbol));
if (dim == R_NilValue) {
// Bare logical vector
UNPROTECT(1);
return true;
}
const R_xlen_t dimensionality = Rf_xlength(dim);
if (dimensionality == 1) {
// 1 dimension array. We allow these because many things in R produce them.
UNPROTECT(1);
return true;
}
const int* p_dim = INTEGER(dim);
if (dimensionality == 2 && p_dim[1] == 1) {
// 1 column matrix. We allow these with a warning that this will be
// deprecated in the future.
if (first) {
dplyr::signal_filter_one_column_matrix();
}
UNPROTECT(1);
return true;
}
UNPROTECT(1);
return false;
}
static inline
void filter_df_reduce(SEXP x,
R_xlen_t n,
bool first,
R_xlen_t i_quo,
SEXP quos,
int* p_reduced) {
if (first) {
SEXP expr = rlang::quo_get_expr(VECTOR_ELT(quos, i_quo));
const bool across = TYPEOF(expr) == LANGSXP && CAR(expr) == dplyr::symbols::across;
if (across) {
dplyr::signal_filter_across();
} else {
dplyr::signal_filter_data_frame();
}
}
const SEXP* p_x = VECTOR_PTR_RO(x);
const R_xlen_t n_col = Rf_xlength(x);
for (R_xlen_t i = 0; i < n_col; ++i) {
SEXP col = p_x[i];
if (!filter_is_valid_lgl(col, first)) {
SEXP names = PROTECT(Rf_getAttrib(x, R_NamesSymbol));
SEXP name = PROTECT(Rf_ScalarString(STRING_ELT(names, i)));
dplyr::stop_filter_incompatible_type(i_quo, quos, name, col);
UNPROTECT(2);
}
filter_lgl_reduce(col, n, p_reduced);
}
}
static
SEXP eval_filter_one(SEXP quos,
SEXP mask,
SEXP caller,
R_xlen_t n,
SEXP env_filter,
bool first) {
// Reduce to a single logical vector of size `n`
SEXP reduced = PROTECT(Rf_allocVector(LGLSXP, n));
int* p_reduced = LOGICAL(reduced);
// Init with `TRUE`
for (R_xlen_t i = 0; i < n; ++i) {
p_reduced[i] = TRUE;
}
const R_xlen_t n_quos = Rf_xlength(quos);
SEXP const* p_quos = VECTOR_PTR_RO(quos);
// Reduce loop
for (R_xlen_t i = 0; i < n_quos; ++i) {
SEXP current_expression = PROTECT(Rf_ScalarInteger(i + 1));
Rf_defineVar(dplyr::symbols::current_expression, current_expression, env_filter);
SEXP res = PROTECT(rlang::eval_tidy(p_quos[i], mask, caller));
const R_xlen_t res_size = vctrs::short_vec_size(res);
if (res_size != n && res_size != 1) {
dplyr::stop_filter_incompatible_size(i, quos, res_size, n);
}
if (filter_is_valid_lgl(res, first)) {
filter_lgl_reduce(res, n, p_reduced);
} else if (Rf_inherits(res, "data.frame")) {
filter_df_reduce(res, n, first, i, quos, p_reduced);
} else {
dplyr::stop_filter_incompatible_type(i, quos, R_NilValue, res);
}
UNPROTECT(2);
}
UNPROTECT(1);
return reduced;
}
SEXP dplyr_mask_eval_all_filter(SEXP quos,
SEXP env_private,
SEXP s_n,
SEXP env_filter) {
DPLYR_MASK_INIT();
const SEXP* p_rows = VECTOR_PTR_RO(rows);
const R_xlen_t n = Rf_asInteger(s_n);
SEXP keep = PROTECT(Rf_allocVector(LGLSXP, n));
int* p_keep = LOGICAL(keep);
for (R_xlen_t i = 0; i < ngroups; ++i) {
DPLYR_MASK_ITERATION_INIT();
DPLYR_MASK_SET_GROUP(i);
const bool first = i == 0;
SEXP rows_i = p_rows[i];
R_xlen_t n_i = Rf_xlength(rows_i);
SEXP result_i = PROTECT(eval_filter_one(
quos,
mask,
caller,
n_i,
env_filter,
first
));
const int* p_rows_i = INTEGER(rows_i);
const int* p_result_i = LOGICAL(result_i);
for (R_xlen_t j = 0; j < n_i; ++j) {
p_keep[p_rows_i[j] - 1] = p_result_i[j];
}
UNPROTECT(1);
DPLYR_MASK_ITERATION_FINALISE();
}
UNPROTECT(1);
DPLYR_MASK_FINALISE();
return keep;
}