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88 lines
2.0 KiB
88 lines
2.0 KiB
#include <Rcpp.h>
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#include "ulid.h"
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using namespace Rcpp;
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//' Generate ULIDs from timestamps
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//'
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//' This function generates a new [Universally Unique Lexicographically
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//' Sortable Identifier](https://github.com/ulid/spec) from a vector of
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//' `POSIXct` timestamps.
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//'
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//' @md
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//' @param tsv vector of `POSIXct` values
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//' @export
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//' @examples
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//' ts_generate(as.POSIXct("2017-11-01 15:00:00", origin="1970-01-01"))
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// [[Rcpp::export]]
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CharacterVector ts_generate(Rcpp::DatetimeVector tsv) {
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CharacterVector c(tsv.size());
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for (long i=0; i<tsv.size(); i++) {
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ulid::ULID u = 0;
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time_t t = static_cast<time_t>(tsv[i]);
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ulid::EncodeTime(t, u);
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ulid::EncodeEntropyRand(u);
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c[i] = ulid::Marshal(u);
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}
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return(c);
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}
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//' Generate ULID
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//'
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//' [ULIDgenerate()] generates a new [Universally Unique Lexicographically
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//' Sortable Identifier](https://github.com/ulid/spec).
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//'
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//' @md
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//' @param n number of id's to generate (default = `1`)
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//' @export
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//' @examples
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//' ULIDgenerate()
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// [[Rcpp::export]]
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CharacterVector ULIDgenerate(long n=1) {
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CharacterVector c(n);
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for (long i=0; i<=(n-1); i++) {
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c[i] = ulid::Marshal(ulid::CreateNowRand());
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}
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return(c);
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}
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//' Unmarshal a ULID into a data frame with timestamp and random bitstring columns
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//'
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//' @md
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//' @param ulids character ULIDs (e.g. created with [ULIDgenerate()])
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//' @export
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//' @return data frame (tibble)
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//' @examples
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//' unmarshal(ULIDgenerate())
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// [[Rcpp::export]]
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DataFrame unmarshal(std::vector<std::string> ulids) {
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unsigned long sz = ulids.size();
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Rcpp::DatetimeVector dt(sz);
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std::vector<std::string> cv(sz);
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for (unsigned long i=0; i<sz; i++) {
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ulid::ULID u = ulid::Unmarshal(ulids[i]);
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dt[i] = Rcpp::Datetime(ulid::Time(u));
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cv[i] = ulids[i].substr(10);
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}
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DataFrame out =
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DataFrame::create(
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_["ts"] = dt,
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_["rnd"] = cv,
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_["stringsAsFactors"] = false
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);
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out.attr("class") = CharacterVector::create("tbl_df", "tbl", "data.frame");
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return(out);
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}
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