macro_tools 0.85.0

Tools for writing procedural macroses.
Documentation 
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//!
//! Property of an attribute which simply wraps one of the standard `syn` types.
//!

use core ::marker ::PhantomData;

use crate :: *;
// use component_model_types ::Assign;

/// Default marker for `AttributePropertySyn`.
/// Used if no marker is defined as parameter.
#[ derive( Debug, Default, Clone, Copy ) ]
pub struct AttributePropertySynMarker;

///
/// Property of an attribute which simply wraps one of the standard `syn` types.
///
#[ derive( Debug, Clone ) ]
pub struct AttributePropertySyn< T, Marker = AttributePropertySynMarker >(T, ::core ::marker ::PhantomData< Marker >)
where
  T: syn ::parse ::Parse + quote ::ToTokens;

impl< T, Marker > AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  /// Just unwraps and returns the internal data.
  // #[ allow( dead_code ) ]
  #[ inline( always ) ]
  pub fn internal(self) -> T
  {
  self.0
 }

  /// Returns a reference to the internal data.
  // #[ allow( dead_code ) ]
  #[ inline( always ) ]
  pub fn ref_internal( &self ) -> &T
  {
  &self.0
 }
}

impl< T, Marker, IntoT > Assign< AttributePropertySyn<T, Marker >, IntoT> for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
  IntoT: Into< AttributePropertySyn<T, Marker >>,
{
  #[ inline( always ) ]
  fn assign(&mut self, component: IntoT) 
  {
  *self = component.into();
 }
}

impl< T, Marker > AttributePropertyComponent for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
  Marker: AttributePropertyComponent,
{
  const KEYWORD: &'static str = Marker ::KEYWORD;
}

impl< T, Marker > syn ::parse ::Parse for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  fn parse(input: syn ::parse ::ParseStream< '_ >) -> syn ::Result< Self > 
  {
  input.parse :: < syn ::Token![ = ] >()?;
  let value: T = input.parse()?;
  Ok(value.into())
 }
}

impl< T, Marker > quote ::ToTokens for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  fn to_tokens(&self, tokens: &mut proc_macro2 ::TokenStream) 
  {
  self.0.to_tokens(tokens);
 }
}

impl< T, Marker > core ::ops ::Deref for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  type Target = T;
  #[ inline( always ) ]
  fn deref( &self ) -> &T 
  {
  &self.0
 }
}

impl< T, Marker > AsRef< T > for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  #[ inline( always ) ]
  fn as_ref( &self ) -> &T 
  {
  &self.0
 }
}

impl< T, Marker > From< T > for AttributePropertySyn< T, Marker >
where
  T: syn ::parse ::Parse + quote ::ToTokens,
{
  #[ inline( always ) ]
  #[ allow( clippy ::default_constructed_unit_structs ) ]
  fn from(src: T) -> Self 
  {
  Self(src, PhantomData ::default())
 }
}