Struct Expr 

pub struct Expr { /* private fields */ }

A parsed, ready-to-evaluate condition expression.

Produced by parse and evaluated by Expr::eval. It owns its whole AST, borrows nothing, and holds no IO, clock, or randomness, so it is safe to keep and re-evaluate for the life of a run.

Implementations

impl Expr

pub fn eval(&self, value: &Value) -> bool

Evaluates the expression against a routed value, always returning a bool.

This is TOTAL: it never panics and never errors for any value. The missing-path, type-mismatch, and number-comparison semantics are those documented on the module. Eval is a single linear walk of the AST, whose size is bounded by MAX_EXPRESSION_LEN.

Trait Implementations

impl Clone for Expr

fn clone(&self) -> Expr

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expr

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

Formats the value using the given formatter.

impl PartialEq for Expr

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Expr