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|
use bstr::{BStr, ByteSlice};
use kstring::{KString, KStringRef};
use crate::{State, StateRef};
/// A container to encapsulate a tightly packed and typically unallocated byte value that isn't necessarily UTF8 encoded.
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct Value(KString);
/// A reference container to encapsulate a tightly packed and typically unallocated byte value that isn't necessarily UTF8 encoded.
#[derive(PartialEq, Eq, Debug, Hash, Ord, PartialOrd, Clone, Copy)]
#[cfg_attr(feature = "serde", derive(serde::Serialize, serde::Deserialize))]
pub struct ValueRef<'a>(#[cfg_attr(feature = "serde", serde(borrow))] KStringRef<'a>);
/// Lifecycle
impl<'a> ValueRef<'a> {
/// Keep `input` as our value.
pub fn from_bytes(input: &'a [u8]) -> Self {
Self(KStringRef::from_ref(
// SAFETY: our API makes accessing that value as `str` impossible, so illformed UTF8 is never exposed as such.
#[allow(unsafe_code)]
unsafe {
std::str::from_utf8_unchecked(input)
},
))
}
}
/// Access and conversions
impl ValueRef<'_> {
/// Access this value as byte string.
pub fn as_bstr(&self) -> &BStr {
self.0.as_bytes().as_bstr()
}
/// Convert this instance into its owned form.
pub fn to_owned(self) -> Value {
self.into()
}
}
impl<'a> From<&'a str> for ValueRef<'a> {
fn from(v: &'a str) -> Self {
ValueRef(v.into())
}
}
impl<'a> From<ValueRef<'a>> for Value {
fn from(v: ValueRef<'a>) -> Self {
Value(v.0.into())
}
}
impl From<&str> for Value {
fn from(v: &str) -> Self {
Value(KString::from_ref(v))
}
}
/// Access
impl Value {
/// Return ourselves as reference.
pub fn as_ref(&self) -> ValueRef<'_> {
ValueRef(self.0.as_ref())
}
}
/// Access
impl StateRef<'_> {
/// Return `true` if the associated attribute was set to be unspecified using the `!attr` prefix or it wasn't mentioned.
pub fn is_unspecified(&self) -> bool {
matches!(self, StateRef::Unspecified)
}
/// Return `true` if the associated attribute was set with `attr`. Note that this will also be `true` if a value is assigned.
pub fn is_set(&self) -> bool {
matches!(self, StateRef::Set | StateRef::Value(_))
}
/// Return `true` if the associated attribute was set with `-attr` to specifically remove it.
pub fn is_unset(&self) -> bool {
matches!(self, StateRef::Unset)
}
/// Attempt to obtain the string value of this state, or return `None` if there is no such value.
pub fn as_bstr(&self) -> Option<&BStr> {
match self {
StateRef::Value(v) => Some(v.as_bstr()),
_ => None,
}
}
}
/// Initialization
impl<'a> StateRef<'a> {
/// Keep `input` in one of our enums.
pub fn from_bytes(input: &'a [u8]) -> Self {
Self::Value(ValueRef::from_bytes(input))
}
}
/// Access
impl<'a> StateRef<'a> {
/// Turn ourselves into our owned counterpart.
pub fn to_owned(self) -> State {
self.into()
}
}
impl<'a> State {
/// Turn ourselves into our ref-type.
pub fn as_ref(&'a self) -> StateRef<'a> {
match self {
State::Value(v) => StateRef::Value(v.as_ref()),
State::Set => StateRef::Set,
State::Unset => StateRef::Unset,
State::Unspecified => StateRef::Unspecified,
}
}
}
impl<'a> From<StateRef<'a>> for State {
fn from(s: StateRef<'a>) -> Self {
match s {
StateRef::Value(v) => State::Value(v.into()),
StateRef::Set => State::Set,
StateRef::Unset => State::Unset,
StateRef::Unspecified => State::Unspecified,
}
}
}
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