Struct FunctionRegistry 

pub struct FunctionRegistry { /* private fields */ }

Registry of all built-in XPath functions.

Provides lookup by namespace, local name, and arity.

Implementations

impl FunctionRegistry

pub fn new() -> Self

Create a new empty registry

pub fn register(&mut self, entry: FunctionEntry)

Register a function entry

pub fn lookup( &self, namespace: &str, local_name: &str, arity: usize, ) -> Option<&FunctionEntry>

Look up a function by namespace, local name, and arity.

Also handles the XPath 2010 namespace alias.

pub fn by_id(&self, id: FunctionId) -> Option<&FunctionEntry>

Get an entry by its FunctionId.

pub fn by_id_value(&self, value: u16) -> Option<&FunctionEntry>

Get an entry by its FunctionId discriminant value.

This is used internally for converting FunctionHandle back to FunctionId.

pub fn entries(&self) -> &[FunctionEntry]

Get a slice of all registered entries.

pub fn len(&self) -> usize

Get the number of registered functions

pub fn is_empty(&self) -> bool

Check if the registry is empty

Trait Implementations

impl Default for FunctionRegistry

fn default() -> Self

Returns the “default value” for a type.