Struct FunctionLibrary 

pub struct FunctionLibrary { /* private fields */ }

Registry of named functions available to expression evaluation.

Built-in functions (round, dice, random_range, …) are pre-registered. Hosts can add their own via FunctionLibrary::register.

Implementations

impl FunctionLibrary

pub fn new() -> Self

Creates a library with the built-in functions pre-registered.

pub fn register<F>(&mut self, name: impl Into<String>, f: F)

where F: Fn(Vec<Value>) -> Result<Value> + Send + Sync + 'static,

Registers a named function.

Replaces any existing function with the same name.

pub fn call(&self, name: &str, args: Vec<Value>) -> Result<Value>

Calls the function named name with args, or returns an error if not found.

Errors

Returns DialogueError::Function if the function is unknown or the call fails.

Trait Implementations

impl Debug for FunctionLibrary

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

Formats the value using the given formatter.

impl Default for FunctionLibrary

fn default() -> Self

Returns the “default value” for a type.