You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
63 lines
2.1 KiB
Racket
63 lines
2.1 KiB
Racket
10 years ago
|
#lang racket/base
|
||
|
|
(require racket/class racket/list "helper.rkt")
|
||
|
|
(provide (all-defined-out))
|
||
|
|
|
||
|
|
(define Domain
|
||
|
|
;; Class used to control possible values for variables
|
||
|
|
;; When list or tuples are used as domains, they are automatically
|
||
|
|
;; converted to an instance of that class.
|
||
|
|
|
||
|
|
(class* object% (printable<%>)
|
||
|
|
(super-new)
|
||
|
|
(init-field set)
|
||
|
|
(field [_list set][_hidden null][_states null])
|
||
|
|
|
||
|
|
(define (repr) (format "<Domain ~v>" _list))
|
||
|
|
(define/public (custom-print out quoting-depth) (print (repr) out))
|
||
|
|
(define/public (custom-display out) (displayln (repr) out))
|
||
|
|
(define/public (custom-write out) (write (repr) out))
|
||
|
|
|
||
|
|
(define/public (resetState)
|
||
|
|
;; Reset to the original domain state, including all possible values
|
||
|
|
(py-extend! _list _hidden)
|
||
|
|
(set! _hidden null)
|
||
|
|
(set! _states null))
|
||
|
|
|
||
|
|
(define/public (pushState)
|
||
|
|
;; Save current domain state
|
||
|
|
;; Variables hidden after that call are restored when that state
|
||
|
|
;; is popped from the stack.
|
||
|
|
(py-append! _states (length _list)))
|
||
|
|
|
||
|
|
(define/public (popState)
|
||
|
|
;; Restore domain state from the top of the stack
|
||
|
|
|
||
|
|
;; Variables hidden since the last popped state are then available
|
||
|
|
;; again.
|
||
|
|
(define diff (- (py-pop! _states) (length _list)))
|
||
|
|
(when (not (= 0 diff))
|
||
|
|
(py-extend! _list (take-right _hidden diff))
|
||
|
|
(set! _hidden (take _hidden (- (length _hidden) diff)))))
|
||
|
|
|
||
|
|
(define/public (hideValue value)
|
||
|
|
;; Hide the given value from the domain
|
||
|
|
|
||
|
|
;; After that call the given value won't be seen as a possible value
|
||
|
|
;; on that domain anymore. The hidden value will be restored when the
|
||
|
|
;; previous saved state is popped.
|
||
|
|
(set! _list (remove value _list))
|
||
|
|
(py-append! _hidden value))
|
||
|
|
|
||
|
|
|
||
|
|
(define/public (domain-pop!)
|
||
|
|
(py-pop! _list))
|
||
|
|
|
||
|
|
(define/public (copy)
|
||
|
|
(define copied-domain (new Domain [set _list]))
|
||
|
|
(set-field! _hidden copied-domain _hidden)
|
||
|
|
(set-field! _states copied-domain _states)
|
||
|
|
copied-domain)
|
||
|
|
|
||
|
|
|
||
|
|
))
|
||
|
|
(define Domain? (is-a?/c Domain))
|