Struct Expression 

pub struct Expression { /* private fields */ }

A parsed bounded expression without IO or arbitrary evaluation.

Implementations

impl Expression

pub fn parse(source: impl Into<String>) -> Result<Self>

Parses a supported deterministic expression.

pub fn source(&self) -> &str

Returns the original normalized expression.

pub fn dependencies(&self) -> Vec<String>

Returns root data fields referenced by the expression in lexical order.

This is used to build the computed-field dependency graph without evaluating the expression or consulting external state.

pub fn evaluate( &self, root: &DataValue, budget: &mut ExpressionBudget, ) -> Result<DataValue>

Evaluates path lookup, literals, comparisons, boolean operators, and concatenation.

Trait Implementations

impl Clone for Expression

fn clone(&self) -> Expression

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Debug for Expression

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

Formats the value using the given formatter.

impl Eq for Expression

impl PartialEq for Expression

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

Equality operator ==.

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

Inequality operator !=.

impl StructuralPartialEq for Expression