Struct DynNode 

pub struct DynNode<T = Nothing>(pub Rc<RefCell<Box<dyn DynamicTokens>>>, _);

Parses a T (default: Nothing). Allows one to replace it at runtime, after parsing with anything else implementing ToTokens. This is backed by a Rc. One can replace any cloned occurrences or only the current one.

Example

let mut token_iter = "foo".to_token_iter();

let parsed = <DynNode<Ident>>::parser(&mut token_iter).unwrap();
assert_tokens_eq!(parsed, "foo");

let _test: Ident = parsed.downcast_ref::<Ident>().unwrap().clone();

// Global replacement of all cloned locations (parsed & other)
let mut other = parsed.clone();
other.replace_all_with(<Cons<ConstInteger<123>, Comma>>::default());
assert_tokens_eq!(parsed, "123,");

// Local replacement (only other)
other.replace_here_with(Bang::default());
assert_tokens_eq!(other, "!");
assert_tokens_eq!(parsed, "123,");

Tuple Fields

0: Rc<RefCell<Box<dyn DynamicTokens>>>

Implementations

impl<T> DynNode<T>

pub fn replace_all_with<U>(&self, this: U) -> Box<dyn DynamicTokens>

where U: DynamicTokens,

Replaces the interior of a DynNode at all locations that cloned this, returns the old content.

pub fn replace_here_with<U>(&mut self, this: U) -> DynNode<T>

where U: DynamicTokens,

Detaches this DynNode, insert new content, returns Self with the old content.

pub fn downcast_ref<U>(&self) -> Option<Ref<'_, U>>

where U: DynamicTokens,

Casts a DynNode to a reference to a concrete type. Will return None on type error.

Trait Implementations

impl<T> Clone for DynNode<T>

where T: Clone,

fn clone(&self) -> DynNode<T>

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T> Debug for DynNode<T>

where T: Debug,

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T> Parser for DynNode<T>

where T: Parse + DynamicTokens,

fn parser(tokens: &mut TokenIter) -> Result<DynNode<T>, Error>

The actual parsing function that must be implemented. This mutates the tokens iterator directly. It should not be called from user code except for implementing parsers itself and then only when the rules below are followed.

impl<T> ToTokens for DynNode<T>

fn to_tokens(&self, tokens: &mut TokenStream)

Write &self to the given TokenStream.

fn to_token_iter(&self) -> TokenIter

Convert &self into a TokenIter object.

fn into_token_iter(self) -> TokenIter

where Self: Sized,

Convert self into a TokenIter object.

fn to_token_stream(&self) -> TokenStream

Convert &self into a TokenStream object.

fn into_token_stream(self) -> TokenStream

where Self: Sized,

Convert self into a TokenStream object.

fn tokens_to_string(&self) -> String

Convert &self into a String object. This is mostly used in the test suite to compare the outputs. When the input is a &str then this parses it and returns a normalized String.