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use crate::convert::{Error, FromMrb, TryFromMrb};
use crate::value::types::{Ruby, Rust};
use crate::value::Value;
use crate::Mrb;
impl FromMrb<String> for Value {
type From = Rust;
type To = Ruby;
fn from_mrb(interp: &Mrb, value: String) -> Self {
Self::from_mrb(interp, value.as_bytes())
}
}
impl FromMrb<&str> for Value {
type From = Rust;
type To = Ruby;
fn from_mrb(interp: &Mrb, value: &str) -> Self {
Self::from_mrb(interp, value.as_bytes())
}
}
impl TryFromMrb<Value> for String {
type From = Ruby;
type To = Rust;
unsafe fn try_from_mrb(
interp: &Mrb,
value: Value,
) -> Result<Self, Error<Self::From, Self::To>> {
if value.ruby_type() == Ruby::Symbol {
return Ok(value.to_s());
}
let bytes = <Vec<u8>>::try_from_mrb(interp, value).map_err(|err| Error {
from: err.from,
to: Rust::String,
})?;
Self::from_utf8(bytes).map_err(|_| Error {
from: Ruby::String,
to: Rust::String,
})
}
}
#[cfg(test)]
mod tests {
use quickcheck_macros::quickcheck;
use std::convert::TryInto;
use crate::convert::{Error, FromMrb, TryFromMrb};
use crate::eval::MrbEval;
use crate::sys;
use crate::value::types::{Ruby, Rust};
use crate::value::Value;
#[test]
fn fail_convert() {
let interp = crate::interpreter().expect("mrb init");
let value = interp.eval("Object.new").expect("eval");
let expected = Error {
from: Ruby::Object,
to: Rust::String,
};
let result = unsafe { String::try_from_mrb(&interp, value) }.map(|_| ());
assert_eq!(result, Err(expected));
}
#[allow(clippy::needless_pass_by_value)]
#[quickcheck]
fn convert_to_string(s: String) -> bool {
let interp = crate::interpreter().expect("mrb init");
let value = Value::from_mrb(&interp, s.clone());
let ptr = unsafe { sys::mrb_string_value_ptr(interp.borrow().mrb, value.inner()) };
let len = unsafe { sys::mrb_string_value_len(interp.borrow().mrb, value.inner()) };
let string =
unsafe { std::slice::from_raw_parts(ptr as *const u8, len.try_into().unwrap()) };
s.as_bytes() == string
}
#[allow(clippy::needless_pass_by_value)]
#[quickcheck]
fn string_with_value(s: String) -> bool {
let interp = crate::interpreter().expect("mrb init");
let value = Value::from_mrb(&interp, s.clone());
value.to_s() == s
}
#[allow(clippy::needless_pass_by_value)]
#[quickcheck]
fn roundtrip(s: String) -> bool {
let interp = crate::interpreter().expect("mrb init");
let value = Value::from_mrb(&interp, s.clone());
let value = unsafe { String::try_from_mrb(&interp, value) }.expect("convert");
value == s
}
#[quickcheck]
fn roundtrip_err(b: bool) -> bool {
let interp = crate::interpreter().expect("mrb init");
let value = Value::from_mrb(&interp, b);
let value = unsafe { String::try_from_mrb(&interp, value) };
let expected = Err(Error {
from: Ruby::Bool,
to: Rust::String,
});
value == expected
}
#[test]
fn symbol_to_string() {
let interp = crate::interpreter().expect("mrb init");
let value = interp.eval(":sym").expect("eval");
let value = unsafe { String::try_from_mrb(&interp, value) }.expect("convert");
assert_eq!(&value, "sym");
}
}