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FunctionCatalog

xsd_schema::xpath::functions::extensible

Trait FunctionCatalog 

Source 
pub trait FunctionCatalog: Debug {
    // Required methods
    fn lookup(
        &self,
        namespace: &str,
        local_name: &str,
        arity: usize,
    ) -> Option<FunctionHandle>;
    fn get_signature(
        &self,
        handle: FunctionHandle,
    ) -> Option<DynamicFunctionSignature>;
}
Expand description

Trait for bind-time function lookup.

Implementors provide function resolution by namespace, local name, and arity. The returned FunctionHandle is stored in the AST for later evaluation.

Required Methods§

Source

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

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

Returns Some(handle) if a matching function is found, None otherwise.

Source

fn get_signature( &self, handle: FunctionHandle, ) -> Option<DynamicFunctionSignature>

Get the signature for a function handle.

Returns None if the handle is invalid.

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§