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use std::any::{Any, TypeId};
use std::fmt::{self, Debug};
use std::result::{ Result as StdResult };
use std::sync::Arc;
use ::error::EncodingError;
use super::{EncodingWriter};
// can not be moved to `super::traits` as it depends on the
// EncodingWriter defined here
/// Trait Implemented by "components" used in header field bodies
///
/// This trait can be turned into a trait object allowing runtime
/// genericallity over the "components" if needed.
pub trait EncodableInHeader: Send + Sync + Any + Debug {
fn encode(&self, encoder: &mut EncodingWriter) -> Result<(), EncodingError>;
fn boxed_clone(&self) -> Box<EncodableInHeader>;
#[doc(hidden)]
fn type_id( &self ) -> TypeId {
TypeId::of::<Self>()
}
}
//TODO we now could use MOPA or similar crates
impl EncodableInHeader {
#[inline(always)]
pub fn is<T: EncodableInHeader>(&self) -> bool {
self.type_id() == TypeId::of::<T>()
}
#[inline]
pub fn downcast_ref<T: EncodableInHeader>(&self) -> Option<&T> {
if self.is::<T>() {
Some( unsafe { &*( self as *const EncodableInHeader as *const T) } )
} else {
None
}
}
#[inline]
pub fn downcast_mut<T: EncodableInHeader>(&mut self) -> Option<&mut T> {
if self.is::<T>() {
Some( unsafe { &mut *( self as *mut EncodableInHeader as *mut T) } )
} else {
None
}
}
}
impl Clone for Box<EncodableInHeader> {
fn clone(&self) -> Self {
self.boxed_clone()
}
}
pub trait EncodableInHeaderBoxExt: Sized {
fn downcast<T: EncodableInHeader>(self) -> StdResult<Box<T>, Self>;
}
impl EncodableInHeaderBoxExt for Box<EncodableInHeader> {
fn downcast<T: EncodableInHeader>(self) -> StdResult<Box<T>, Self> {
if EncodableInHeader::is::<T>(&*self) {
let ptr: *mut EncodableInHeader = Box::into_raw(self);
Ok( unsafe { Box::from_raw(ptr as *mut T) } )
} else {
Err( self )
}
}
}
impl EncodableInHeaderBoxExt for Box<EncodableInHeader+Send> {
fn downcast<T: EncodableInHeader>(self) -> StdResult<Box<T>, Self> {
if EncodableInHeader::is::<T>(&*self) {
let ptr: *mut EncodableInHeader = Box::into_raw(self);
Ok( unsafe { Box::from_raw(ptr as *mut T) } )
} else {
Err( self )
}
}
}
/// Generate a think implementing `EncodableInHeader` from an function.
///
/// (Mainly used in the inside of tests.)
#[macro_export]
macro_rules! enc_func {
(|$enc:ident : &mut EncodingWriter| $block:block) => ({
use $crate::error::EncodingError;
fn _anonym($enc: &mut EncodingWriter) -> Result<(), EncodingError> {
$block
}
let fn_pointer = _anonym as fn(&mut EncodingWriter) -> Result<(), EncodingError>;
$crate::encoder::EncodeFn::new(fn_pointer)
});
}
type _EncodeFn = for<'a, 'b> fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>;
/// A wrapper for an function making it implement `EncodableInHeader`.
#[derive(Clone, Copy)]
pub struct EncodeFn(_EncodeFn);
impl EncodeFn {
pub fn new(func: _EncodeFn) -> Self {
EncodeFn(func)
}
}
impl EncodableInHeader for EncodeFn {
fn encode(&self, encoder: &mut EncodingWriter) -> Result<(), EncodingError> {
(self.0)(encoder)
}
fn boxed_clone(&self) -> Box<EncodableInHeader> {
Box::new(*self)
}
}
impl Debug for EncodeFn {
fn fmt(&self, fter: &mut fmt::Formatter) -> fmt::Result {
write!(fter, "EncodeFn(..)")
}
}
/// Generate a think implementing `EncodableInHeader` from an closure.
///
/// (Mainly used in the inside of tests.)
#[macro_export]
macro_rules! enc_closure {
($($t:tt)*) => ({
$crate::encoder::EncodeClosure::new($($t)*)
});
}
/// A wrapper for an closure making it implement `EncodableInHeader`.
pub struct EncodeClosure<FN: 'static>(Arc<FN>)
where FN: Send + Sync +
for<'a, 'b> Fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>;
impl<FN: 'static> EncodeClosure<FN>
where FN: Send + Sync +
for<'a, 'b> Fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>
{
pub fn new(closure: FN) -> Self {
EncodeClosure(Arc::new(closure))
}
}
impl<FN: 'static> EncodableInHeader for EncodeClosure<FN>
where FN: Send + Sync +
for<'a, 'b> Fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>
{
fn encode(&self, encoder: &mut EncodingWriter) -> Result<(), EncodingError> {
(self.0)(encoder)
}
fn boxed_clone(&self) -> Box<EncodableInHeader> {
Box::new(self.clone())
}
}
impl<FN: 'static> Clone for EncodeClosure<FN>
where FN: Send + Sync +
for<'a, 'b> Fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>
{
fn clone(&self) -> Self {
EncodeClosure(self.0.clone())
}
}
impl<FN: 'static> Debug for EncodeClosure<FN>
where FN: Send + Sync +
for<'a, 'b> Fn(&'a mut EncodingWriter<'b>) -> Result<(), EncodingError>
{
fn fmt(&self, fter: &mut fmt::Formatter) -> fmt::Result {
write!(fter, "EncodeClosure(..)")
}
}
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