Struct Rule 

pub struct Rule { /* private fields */ }

A rule is an expression with a name

Implementations

impl Rule

pub fn parse(input: &str) -> Result<Self, Error>

impl Rule

pub fn new( name: impl Into<String>, metadata: BTreeMap<String, Value>, expr: Expr, ) -> Self

Construct a new rule from a name and an expression

pub fn name(&self) -> &str

Return the name of the rule

pub fn get_metadata(&self, field: &str) -> Option<&Value>

Read a metadata field by name

pub fn iter_metadata(&self) -> impl Iterator<Item = (&str, &Value)>

pub fn description(&self) -> Option<&str>

Return an optional description of the rule

pub fn expr(&self) -> &Expr

Trait Implementations

impl Clone for Rule

fn clone(&self) -> Rule

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Rule

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

Formats the value using the given formatter.

impl PartialEq for Rule

fn eq(&self, other: &Rule) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl StructuralPartialEq for Rule