use crate::{handle_exception, qjs, Ctx, Error, Result, StdString, Value};
use std::{mem, slice, str};
#[derive(Debug, Clone, PartialEq)]
#[repr(transparent)]
pub struct String<'js>(pub(crate) Value<'js>);
impl<'js> String<'js> {
pub fn to_string(&self) -> Result<StdString> {
let mut len = mem::MaybeUninit::uninit();
let ptr =
unsafe { qjs::JS_ToCStringLen(self.0.ctx.ctx, len.as_mut_ptr(), self.0.as_js_value()) };
if ptr.is_null() {
return Err(Error::Unknown);
}
let len = unsafe { len.assume_init() };
let bytes: &[u8] = unsafe { slice::from_raw_parts(ptr as _, len as _) };
let result = str::from_utf8(bytes).map(|s| s.into());
unsafe { qjs::JS_FreeCString(self.0.ctx.ctx, ptr) };
Ok(result?)
}
pub fn from_str(ctx: Ctx<'js>, s: &str) -> Result<Self> {
let len = s.as_bytes().len();
let ptr = s.as_ptr();
Ok(unsafe {
let js_val = qjs::JS_NewStringLen(ctx.ctx, ptr as _, len as _);
let js_val = handle_exception(ctx, js_val)?;
String::from_js_value(ctx, js_val)
})
}
}
#[cfg(test)]
mod test {
use crate::*;
#[test]
fn from_javascript() {
test_with(|ctx| {
let s: String = ctx.eval(" 'foo bar baz' ").unwrap();
assert_eq!(s.to_string().unwrap(), "foo bar baz");
});
}
#[test]
fn to_javascript() {
test_with(|ctx| {
let string = String::from_str(ctx, "foo").unwrap();
let func: Function = ctx.eval("x => x + 'bar'").unwrap();
let text: StdString = (string,).apply(&func).unwrap();
assert_eq!(text, "foobar".to_string());
});
}
}