Expand description
§Savvy - A Simple R Interface
savvy is a simple R extension interface using Rust, like the extendr framework.
The name “savvy” comes from the Japanese word “錆” (pronounced as sàbí), which means “Rust”.
With savvy, you can automatically generate R functions from Rust code. This is an example of what savvy-powered function would look like.
Rust:
use savvy::savvy;
/// Convert to Upper-case
///
/// @param x A character vector.
/// @export
#[savvy]
fn to_upper(x: StringSexp) -> savvy::Result<savvy::Sexp> {
// Use `Owned{type}Sexp` to allocate an R vector for output.
let mut out = OwnedStringSexp::new(x.len())?;
for (i, e) in x.iter().enumerate() {
// To Rust, missing value is an ordinary value. In `&str`'s case, it's just "NA".
// You have to use `.is_na()` method to distinguish the missing value.
if e.is_na() {
// Set the i-th element to NA
out.set_na(i)?;
continue;
}
let e_upper = e.to_uppercase();
out.set_elt(i, e_upper.as_str())?;
}
out.into()
}R:
to_upper(c("a", "b", "c"))
#> [1] "A" "B" "C"
§User guide
Re-exports§
pub use error::Error;pub use error::Result;pub use sexp::external_pointer::get_external_pointer_addr;pub use sexp::external_pointer::take_external_pointer_value;pub use sexp::external_pointer::ExternalPointerSexp;pub use sexp::external_pointer::IntoExtPtrSexp;pub use sexp::function::FunctionArgs;pub use sexp::function::FunctionSexp;pub use sexp::integer::IntegerSexp;pub use sexp::integer::OwnedIntegerSexp;pub use sexp::list::ListSexp;pub use sexp::list::OwnedListSexp;pub use sexp::logical::LogicalSexp;pub use sexp::logical::OwnedLogicalSexp;pub use sexp::na::NotAvailableValue;pub use sexp::null::NullSexp;pub use sexp::numeric::NumericScalar;pub use sexp::numeric::NumericSexp;pub use sexp::numeric::NumericTypedSexp;pub use sexp::real::OwnedRealSexp;pub use sexp::real::RealSexp;pub use sexp::string::OwnedStringSexp;pub use sexp::string::StringSexp;pub use sexp::Sexp;pub use sexp::TypedSexp;pub use sexp::complex::ComplexSexp;pub use sexp::complex::OwnedComplexSexp;pub use unwind_protect::unwind_protect;pub use eval::assert_eq_r_code;pub use eval::eval_parse_text;pub use eval::EvalResult;