Struct Context 

pub struct Context<'i> { /* private fields */ }

A context for registering and expanding procedural macros.

The Context holds a registry of macro implementations and provides methods to transform Rust source code by expanding these macros.

Implementations

impl<'i> Context<'i>

pub fn new() -> Self

Creates a new empty Context.

pub fn register_proc_macro<F, T>(&mut self, ident: String, f: F) -> &mut Self

where F: Fn(T) -> TokenStream + 'i, T: Parse,

Registers a function-like procedural macro.

The macro will be invoked when encountered in expression or type position with the syntax macro_name!(...), macro_name![...] or macro_name!{...}.

pub fn register_proc_macro_attribute<F, T>( &mut self, ident: String, f: F, ) -> &mut Self

where F: Fn(T, TokenStream) -> TokenStream + 'i, T: Parse,

Registers a procedural macro attribute.

The macro will be invoked when used as an attribute on items with the syntax #[macro_name] or #[macro_name(...)].

pub fn register_proc_macro_derive<F, T>( &mut self, ident: String, f: F, attributes: Vec<String>, ) -> &mut Self

where F: Fn(T) -> TokenStream + 'i, T: Parse,

Registers a derive procedural macro.

The macro will be invoked when used in a #[derive(...)] attribute. Generated implementations will be added after the original item.

pub fn transform(&self, input: TokenStream) -> TokenStream

Trait Implementations

impl<'i> Default for Context<'i>

fn default() -> Context<'i>

Returns the “default value” for a type.