Struct ConditionEvaluator 

pub struct ConditionEvaluator { /* private fields */ }

Condition evaluator for state machine transitions

Evaluates JavaScript/TypeScript-like expressions in a sandboxed environment. Supports variable access, comparison operators, logical operators, and array/object access.

Implementations

impl ConditionEvaluator

pub fn new() -> ConditionEvaluator

Create a new condition evaluator with empty context

pub fn with_context(context: HashMap<String, Value>) -> ConditionEvaluator

Create a new condition evaluator with initial context

pub fn set_variable(&mut self, name: impl Into<String>, value: Value)

Set a context variable

pub fn get_variable(&self, name: &str) -> Option<&Value>

Get a context variable

pub fn evaluate(&self, expression: &str) -> Result<bool, ConditionError>

Evaluate a condition expression

The expression can access variables from the context using dot notation (e.g., state.status, entity.count). Supports:

• Comparison: ==, !=, >, <, >=, <=
• Logical: &&, ||, !
• Arithmetic: +, -, *, /, %
• Array/object access: arr[0], obj.field

Returns true if the condition is satisfied, false otherwise.

Trait Implementations

impl Default for ConditionEvaluator

fn default() -> ConditionEvaluator

Returns the “default value” for a type.