(module expand mzscheme
  (require "model/trace.ss"
           "model/hide.ss")
  (provide expand-only
           expand/hide)
  
  (provide expand/step)
  (define (expand/step . args)
    (apply (dynamic-require '(lib "stepper.ss" "macro-debugger") 'expand/step)
           args))
  
  (define (expand-only stx show-list)
    (define (show? id)
      (ormap (lambda (x) (module-identifier=? id x))
             show-list))
    (expand/hiding stx show?))
  
  (define (expand/hide stx hide-list)
    (define (show? id)
      (andmap (lambda (x) (not (module-identifier=? id x)))
              hide-list))
    (expand/hiding stx show?))
  
  (define (expand/hiding stx show?)
    (let-values ([(result deriv) (trace/result stx)])
      (when (exn? result)
        (raise result))
      (let-values ([(_d estx) (hide/policy deriv show?)])
        estx)))
  
  )