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use std::borrow::Cow;
use std::string::String as StdString;
use std::{slice, str};
#[cfg(feature = "serialize")]
use {
serde::ser::{Serialize, Serializer},
std::result::Result as StdResult,
};
use crate::error::{Error, Result};
use crate::ffi;
use crate::types::LuaRef;
use crate::util::{assert_stack, StackGuard};
#[derive(Clone, Debug)]
pub struct String<'lua>(pub(crate) LuaRef<'lua>);
impl<'lua> String<'lua> {
pub fn to_str(&self) -> Result<&str> {
str::from_utf8(self.as_bytes()).map_err(|e| Error::FromLuaConversionError {
from: "string",
to: "&str",
message: Some(e.to_string()),
})
}
pub fn to_string_lossy(&self) -> Cow<'_, str> {
StdString::from_utf8_lossy(self.as_bytes())
}
pub fn as_bytes(&self) -> &[u8] {
let nulled = self.as_bytes_with_nul();
&nulled[..nulled.len() - 1]
}
pub fn as_bytes_with_nul(&self) -> &[u8] {
let lua = self.0.lua;
unsafe {
let _sg = StackGuard::new(lua.state);
assert_stack(lua.state, 1);
lua.push_ref(&self.0);
mlua_debug_assert!(
ffi::lua_type(lua.state, -1) == ffi::LUA_TSTRING,
"string ref is not string type"
);
let mut size = 0;
let data = ffi::lua_tolstring(lua.state, -1, &mut size);
slice::from_raw_parts(data as *const u8, size + 1)
}
}
}
impl<'lua> AsRef<[u8]> for String<'lua> {
fn as_ref(&self) -> &[u8] {
self.as_bytes()
}
}
impl<'lua, T> PartialEq<T> for String<'lua>
where
T: AsRef<[u8]>,
{
fn eq(&self, other: &T) -> bool {
self.as_bytes() == other.as_ref()
}
}
#[cfg(feature = "serialize")]
impl<'lua> Serialize for String<'lua> {
fn serialize<S>(&self, serializer: S) -> StdResult<S::Ok, S::Error>
where
S: Serializer,
{
match self.to_str() {
Ok(s) => serializer.serialize_str(s),
Err(_) => serializer.serialize_bytes(self.as_bytes()),
}
}
}