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Copy pathencode.cpp
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147 lines (134 loc) · 3.23 KB
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#include "pch.h"
#include "encode.h"
// [[Rcpp::export]]
std::string encode_vector(RObject x) {
std::string buffer;
int n = Rf_length(x);
for (int i = 0; i < n; ++i) {
encode_in_buffer(x, i, buffer);
if (i != n - 1)
buffer.push_back('\n');
}
return buffer;
}
void encode_row_in_buffer(List x, int i, std::string& buffer,
std::string fieldDelim,
std::string lineDelim) {
int p = Rf_length(x);
for (int j = 0; j < p; ++j) {
RObject xj(x[j]);
encode_in_buffer(xj, i, buffer);
if (j != p - 1)
buffer.append(fieldDelim);
}
buffer.append(lineDelim);
}
// [[Rcpp::export]]
std::string encode_data_frame(List x) {
if (Rf_length(x) == 0)
return ("");
int n = Rf_length(x[0]);
std::string buffer;
for (int i = 0; i < n; ++i) {
encode_row_in_buffer(x, i, buffer);
}
return buffer;
}
// =============================================================================
// Derived from EncodeElementS in RPostgreSQL
// Written by: [email protected]
// License: GPL-2
void encode_in_buffer(RObject x, int i, std::string& buffer) {
switch (TYPEOF(x)) {
case LGLSXP:
{
int value = LOGICAL(x)[i];
if (value == TRUE) {
buffer.append("true");
} else if (value == FALSE) {
buffer.append("false");
} else {
buffer.append("\\N");
}
break;
}
case INTSXP:
{
int value = INTEGER(x)[i];
if (value == NA_INTEGER) {
buffer.append("\\N");
} else {
char buf[32];
snprintf(buf, 32, "%d", value);
buffer.append(buf);
}
break;
}
case REALSXP:
{
double value = REAL(x)[i];
if (!R_FINITE(value)) {
if (ISNA(value)) {
buffer.append("\\N");
} else if (ISNAN(value)) {
buffer.append("NaN");
} else if (value > 0) {
buffer.append("Infinity");
} else {
buffer.append("-Infinity");
}
} else {
char buf[17 + 1 + 1 + 4 + 1]; // minus + decimal + exponent + \0
snprintf(buf, sizeof(buf), "%.17g", value);
buffer.append(buf);
}
break;
}
case STRSXP:
{
RObject value = STRING_ELT(x, i);
if (value == NA_STRING) {
buffer.append("\\N");
} else {
const char* s = Rf_translateCharUTF8(STRING_ELT(x, i));
escape_in_buffer(s, buffer);
}
break;
}
default:
stop("Don't know how to handle vector of type %s.",
Rf_type2char(TYPEOF(x)));
}
}
// Escape postgresql special characters
// https://www.postgresql.org/docs/current/sql-copy.html
void escape_in_buffer(const char* string, std::string& buffer) {
size_t len = strlen(string);
for (size_t i = 0; i < len; ++i) {
switch (string[i]) {
case '\b':
buffer.append("\\b");
break;
case '\f':
buffer.append("\\f");
break;
case '\n':
buffer.append("\\n");
break;
case '\r':
buffer.append("\\r");
break;
case '\t':
buffer.append("\\t");
break;
case '\v':
buffer.append("\\v");
break;
case '\\':
buffer.append("\\\\");
break;
default:
buffer.push_back(string[i]);
}
}
}