Struct MacroTable 

pub struct MacroTable { /* private fields */ }

The macros in scope.

Implementations

impl MacroTable

pub const fn new() -> Self

An empty table.

pub fn define(&mut self, name: &str, body: &str) -> Result<(), String>

Define name as the object-like macro body, replacing any previous definition.

Errors

A replacement list §16.3.3/1 forbids, or one that does not tokenize, in one sentence.

pub fn define_function( &mut self, name: &str, params: Vec<String>, body: &str, ) -> Result<(), String>

Define name as a function-like macro.

Errors

As Self::define, and a parameter list §16.3/4 forbids — a name that is not an identifier, or one written twice — or a # not followed by a parameter (§16.3.2/1).

pub fn undefine(&mut self, name: &str)

Remove name, if it was defined.

pub fn is_defined(&self, name: &str) -> bool

Whether name is defined, whatever its body.

An include guard defines a name with an empty body, so emptiness is not absence.

pub fn get(&self, name: &str) -> Option<&Macro>

The macro called name.

pub fn len(&self) -> usize

How many macros are defined.

pub fn is_empty(&self) -> bool

Whether none are.

Trait Implementations

impl Clone for MacroTable

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MacroTable

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

Formats the value using the given formatter.

impl Default for MacroTable

fn default() -> Self

Returns the “default value” for a type.