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use crate::magic::transl8::impl_magic;
use crate::Error;
use std::ops::{Deref, DerefMut};
use super::transl8::{FromV8, ToV8};
#[derive(Default, PartialEq, Eq, Debug)]
pub struct U16String(pub Vec<u16>);
impl_magic!(U16String);
impl U16String {
pub fn with_zeroes(length: usize) -> U16String {
U16String(vec![0u16; length])
}
pub fn truncate(&mut self, new_length: usize) {
self.0.truncate(new_length);
self.0.shrink_to_fit()
}
}
impl Deref for U16String {
type Target = [u16];
fn deref(&self) -> &[u16] {
self.0.deref()
}
}
impl DerefMut for U16String {
fn deref_mut(&mut self) -> &mut [u16] {
self.0.deref_mut()
}
}
impl AsRef<[u16]> for U16String {
fn as_ref(&self) -> &[u16] {
self.0.as_ref()
}
}
impl AsMut<[u16]> for U16String {
fn as_mut(&mut self) -> &mut [u16] {
self.0.as_mut()
}
}
impl ToV8 for U16String {
fn to_v8<'a>(
&self,
scope: &mut v8::HandleScope<'a>,
) -> Result<v8::Local<'a, v8::Value>, crate::Error> {
let v =
v8::String::new_from_two_byte(scope, self, v8::NewStringType::Normal)
.unwrap();
Ok(v.into())
}
}
impl FromV8 for U16String {
fn from_v8(
scope: &mut v8::HandleScope,
value: v8::Local<v8::Value>,
) -> Result<Self, crate::Error> {
let v8str = v8::Local::<v8::String>::try_from(value)
.map_err(|_| Error::ExpectedString)?;
let len = v8str.length();
let mut buffer = Vec::with_capacity(len);
// SAFETY: we set length == capacity (see previous line),
// before immediately writing into that buffer and sanity check with an assert
#[allow(clippy::uninit_vec)]
unsafe {
buffer.set_len(len);
let written = v8str.write(
scope,
&mut buffer,
0,
v8::WriteOptions::NO_NULL_TERMINATION,
);
assert!(written == len);
}
Ok(U16String(buffer))
}
}
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