Struct MacroRegistry 

pub struct MacroRegistry { /* private fields */ }

Registry of macros with efficient lookup.

Macros are keyed by name:arg_count:is_receiver. Lookup tries the exact key first, then falls back to a vararg key.

Implementations

impl MacroRegistry

pub fn new() -> Self

Create an empty macro registry.

pub fn standard() -> Self

Create a registry with the standard CEL macros.

pub fn register(&mut self, macro_def: Macro)

Register a macro in the registry.

pub fn lookup( &self, name: &str, arg_count: usize, is_receiver: bool, ) -> Option<&Macro>

Look up a macro by name, argument count, and receiver style.

First tries exact match, then falls back to vararg match if applicable.

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

Check if the registry contains a macro with the given name.

pub fn iter(&self) -> impl Iterator<Item = &Macro>

Get an iterator over all registered macros.

pub fn len(&self) -> usize

Get the number of registered macros.

pub fn is_empty(&self) -> bool

Check if the registry is empty.

pub fn expected_args_description( &self, name: &str, is_receiver: bool, ) -> Option<String>

Return a human-readable description of expected argument counts for a macro.

Given a macro name and whether it’s called as a receiver, collects all registered argument counts and formats them (e.g., “exactly 1 argument”, “2 or 3 arguments”). Returns None if no macros match the name + style.

Trait Implementations

impl Clone for MacroRegistry

fn clone(&self) -> MacroRegistry

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for MacroRegistry

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

Formats the value using the given formatter.

impl Default for MacroRegistry

fn default() -> Self

Returns the “default value” for a type.