Struct Options 

pub struct Options { /* private fields */ }

Parser/runtime extension registry.

Implementations

impl Options

pub fn new() -> Options

pub fn convert_legacy(&mut self, enabled: bool) -> &mut Options

Enable or disable transparent conversion of legacy function objects (on by default). When disabled, a bare JSON object is rejected as a parse error rather than being treated as a legacy function.

pub fn macro_def( &mut self, name: impl Into<String>, params: Vec<String>, body: Value, ) -> &mut Options

Register a macro expanded at parse time.

pub fn function( &mut self, name: impl Into<String>, params: Vec<String>, body: Value, ) -> &mut Options

Register a function invoked at evaluation time (may recurse).

pub fn native<F>( &mut self, name: impl Into<String>, arity: usize, f: F, ) -> &mut Options

where F: Fn(&[Value], &EvaluationContext) -> Result<Value, EvalError> + Send + Sync + 'static,

Register a native Rust function of the given arity. The closure receives the evaluated argument values and the evaluation context.

Trait Implementations

impl Debug for Options

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

Formats the value using the given formatter.

impl Default for Options

fn default() -> Options

Returns the “default value” for a type.