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.
76 lines
2.4 KiB
Racket
76 lines
2.4 KiB
Racket
#lang racket/base
|
|
(require (for-syntax racket/base racket/syntax br/syntax) br/define racket/class)
|
|
(provide (all-defined-out))
|
|
|
|
(define string%
|
|
(class* object% (writable<%>)
|
|
(super-new)
|
|
(init-field [data #f])
|
|
(define (get-string)
|
|
(with-handlers ([exn:fail:object? (λ (exn) data)])
|
|
(send this toString)))
|
|
(define/public (custom-write port) (write (get-string) port))
|
|
(define/public (custom-display port) (display (get-string) port))))
|
|
|
|
(define mixin-tester%
|
|
(class object%
|
|
(super-new)
|
|
(define/public (addContent val) (make-object string% val))))
|
|
|
|
(define-macro (as-method ID)
|
|
(with-pattern ([PRIVATE-ID (generate-temporary #'ID)])
|
|
#'(begin
|
|
(public [PRIVATE-ID ID])
|
|
(define (PRIVATE-ID . args) (apply ID this args)))))
|
|
|
|
|
|
(define-macro (as-methods ID ...)
|
|
#'(begin (as-method ID) ...))
|
|
|
|
|
|
(define-macro (define-instance ID (MAKER BASE-CLASS . ARGS))
|
|
(with-pattern ([ID-CLASS (prefix-id #'BASE-CLASS ":" #'ID)])
|
|
#'(define ID (let ([ID-CLASS (class BASE-CLASS (super-new))])
|
|
(MAKER ID-CLASS . ARGS)))))
|
|
|
|
(define-macro (define-subclass SUPERCLASS (ID . INIT-ARGS) . BODY)
|
|
#'(define-subclass* SUPERCLASS (ID . INIT-ARGS) (super-new) . BODY))
|
|
|
|
|
|
(define-macro (define-subclass* SUPERCLASS (ID . INIT-ARGS) . BODY)
|
|
(with-pattern ([+ID (prefix-id "+" #'ID)]
|
|
[ID? (suffix-id #'ID "?")])
|
|
#'(begin
|
|
(define ID (class SUPERCLASS (init-field . INIT-ARGS) . BODY))
|
|
(define (ID? x) (is-a? x ID))
|
|
(define (+ID . args) (apply make-object ID args)))))
|
|
|
|
|
|
(define-macro (push-field! FIELD O EXPR)
|
|
#'(set-field! FIELD O (cons EXPR (get-field FIELD O))))
|
|
|
|
|
|
(define-macro (push-end-field! FIELD O EXPR)
|
|
#'(set-field! FIELD O (append (get-field FIELD O) (list EXPR))))
|
|
|
|
(define-macro (pop-field! FIELD O)
|
|
#'(let ([xs (get-field FIELD O)])
|
|
(set-field! FIELD O (cdr xs))
|
|
(car xs)))
|
|
|
|
(define-macro-cases increment-field!
|
|
[(_ FIELD O) #'(increment-field! FIELD O 1)]
|
|
[(_ FIELD O EXPR)
|
|
#'(begin (set-field! FIELD O (+ (get-field FIELD O) EXPR)) (get-field FIELD O))])
|
|
|
|
|
|
(define-macro (getter-field/override [ID . EXPRS])
|
|
(syntax-property #'(getter-field [ID . EXPRS]) 'override #t))
|
|
|
|
|
|
(define-macro (getter-field [ID . EXPRS])
|
|
(with-pattern ([_ID (prefix-id "_" #'ID)])
|
|
#`(begin
|
|
(field [(ID _ID) . EXPRS])
|
|
(public (_ID ID))
|
|
(#,(if (syntax-property caller-stx 'override) #'define/override #'define) (_ID) ID)))) |