// Package reducer provides the abstract Reducer interface for all expression
// reduction strategies.
package reducer

import "git.maximhutz.com/max/lambda/pkg/expr"

// Reducer defines the interface for expression reduction strategies.
// Different evaluation modes (normal order, applicative order, SKI combinators,
// etc.) implement this interface with their own reduction logic.
type Reducer interface {
	// Reduce performs all reduction steps on the expression, calling onStep
	// after each reduction.
	// Returns the final reduced expression.
	Reduce(e expr.Expression, onStep func(expr.Expression)) expr.Expression
}