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racket/control: Racketize & remove trailing whitespace

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original commit: ed9c612cae3ac53984445fbe6731ca0870915932
This commit is contained in:
Asumu Takikawa 2012-06-21 15:55:43 -04:00
parent 9b7e9c5feb
commit 3f831d6f4b
1 changed files with 227 additions and 227 deletions
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454
collects/mzlib/control.rkt
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@ -1,268 +1,268 @@
(module control racket/base
#lang racket/base
(require (for-syntax racket/base))
(require (for-syntax racket/base))
(provide call/prompt call/comp abort/cc
(provide call/prompt call/comp abort/cc
abort
fcontrol %
abort
control prompt control-at prompt-at
;; `-at' variations expect a prompt tag
fcontrol %
shift reset shift-at reset-at
control prompt control-at prompt-at
;; `-at' variations expect a prompt tag
control0 prompt0 control0-at prompt0-at
shift0 reset0 shift0-at reset0-at
spawn
shift reset shift-at reset-at
splitter
control0 prompt0 control0-at prompt0-at
shift0 reset0 shift0-at reset0-at
new-prompt set cupto)
spawn
;; ----------------------------------------
splitter
(define call/prompt call-with-continuation-prompt)
(define call/comp call-with-composable-continuation)
(define abort/cc abort-current-continuation)
new-prompt set cupto)
;; ----------------------------------------
;; ----------------------------------------
(define (abort . vals)
(abort-current-continuation
(default-continuation-prompt-tag)
(lambda () (apply values vals))))
(define call/prompt call-with-continuation-prompt)
(define call/comp call-with-composable-continuation)
(define abort/cc abort-current-continuation)
;; ----------------------------------------
;; Sitaram, PLDI'93
;; The `%' here is compable with Sitaram & Felleisen, LSC'90,
;; since we make the handler optional.
;; ----------------------------------------
(define (fcontrol f #:tag [prompt-tag (default-continuation-prompt-tag)])
(call-with-composable-continuation
(lambda (k)
(abort-current-continuation
prompt-tag
f
k))))
(define (abort . vals)
(abort-current-continuation
(default-continuation-prompt-tag)
(lambda () (apply values vals))))
(define-syntax %
(syntax-rules ()
[(_ expr handler #:tag prompt-tag)
(call-with-continuation-prompt
(lambda () expr)
prompt-tag
handler)]
[(_ expr handler)
(call-with-continuation-prompt
(lambda () expr)
(default-continuation-prompt-tag)
handler)]
[(_ expr)
(call-with-continuation-prompt
(lambda () expr))]))
;; ----------------------------------------
;; Sitaram, PLDI'93
;; The `%' here is compable with Sitaram & Felleisen, LSC'90,
;; since we make the handler optional.
;; ----------------------------------------
;; Predecessors of Sitaram, PLDI'93
;; Felleisen, Wand, Friedman, & Duba, LFP'88
;; Instead of `#', we use `prompt' as in Felleisen, POPL'88
;; (where `control' is called `F')
;; See also Sitaram and Felleisen, LSC'90
(define (fcontrol f #:tag [prompt-tag (default-continuation-prompt-tag)])
(call-with-composable-continuation
(lambda (k)
(abort-current-continuation
prompt-tag
f
k))))
;; Helpder function: abort-current-continuation/keep-prompt is
;; like abort-current-continuation, but it always leaves the
;; prompt in place, independent of the prompt's handler.
;; This is possible via call/cc (i.e., it must be possible
;; to abort and keep a prompt, because call/cc needs it).
(define (abort-current-continuation/keep-prompt tag thunk)
((call-with-continuation-prompt
(lambda ()
((call-with-current-continuation
(lambda (k) (lambda () k))
tag)))
tag)
thunk))
(define-syntax %
(syntax-rules ()
[(_ expr handler #:tag prompt-tag)
(call-with-continuation-prompt
(lambda () expr)
prompt-tag
handler)]
[(_ expr handler)
(call-with-continuation-prompt
(lambda () expr)
(default-continuation-prompt-tag)
handler)]
[(_ expr)
(call-with-continuation-prompt
(lambda () expr))]))
;; call-with-control, parameterized over whether to keep the
;; prompt (if the prompt's handler gives us the option of
;; removing it). The generated function is the same
;; as fcontrol when `abort-cc' is `abort-current-continuation'.
(define (make-call-with-control abort-cc)
;; Uses call/cc to always keep the enclosing prompt.
(letrec ([call-with-control
(case-lambda
[(f) (call-with-control f (default-continuation-prompt-tag))]
[(f tag) (call-with-composable-continuation
(lambda (k)
(abort-cc
tag
(lambda ()
(f k))))
tag)])])
call-with-control))
;; ----------------------------------------
;; Predecessors of Sitaram, PLDI'93
;; Felleisen, Wand, Friedman, & Duba, LFP'88
;; Instead of `#', we use `prompt' as in Felleisen, POPL'88
;; (where `control' is called `F')
;; See also Sitaram and Felleisen, LSC'90
(define call-with-control
(make-call-with-control abort-current-continuation/keep-prompt))
;; Helpder function: abort-current-continuation/keep-prompt is
;; like abort-current-continuation, but it always leaves the
;; prompt in place, independent of the prompt's handler.
;; This is possible via call/cc (i.e., it must be possible
;; to abort and keep a prompt, because call/cc needs it).
(define (abort-current-continuation/keep-prompt tag thunk)
((call-with-continuation-prompt
(lambda ()
((call-with-current-continuation
(lambda (k) (lambda () k))
tag)))
tag)
thunk))
(define-syntax define-control-macros
(syntax-rules ()
[(_ control control-at call-with-control)
(begin
(define-syntax (control stx)
(syntax-case stx ()
[(control id expr0 expr (... ...))
(identifier? #'id)
#'(call-with-control (lambda (id) expr0 expr (... ...)))]))
(define-syntax (control-at stx)
(syntax-case stx ()
[(control-at tag id expr0 expr (... ...))
(identifier? #'id)
#'(call-with-control (lambda (id) expr0 expr (... ...)) tag)])))]))
(define-control-macros control control-at call-with-control)
;; call-with-control, parameterized over whether to keep the
;; prompt (if the prompt's handler gives us the option of
;; removing it). The generated function is the same
;; as fcontrol when `abort-cc' is `abort-current-continuation'.
(define (make-call-with-control abort-cc)
;; Uses call/cc to always keep the enclosing prompt.
(letrec ([call-with-control
(case-lambda
[(f) (call-with-control f (default-continuation-prompt-tag))]
[(f tag) (call-with-composable-continuation
(lambda (k)
(abort-cc
tag
(lambda ()
(f k))))
tag)])])
call-with-control))
(define-syntax define-prompt-macros
(syntax-rules ()
[(_ prompt prompt-at call-with-prompt)
(begin
(define-syntax prompt
(syntax-rules ()
[(prompt expr0 expr (... ...))
(call-with-prompt (lambda () expr0 expr (... ...)))]))
(define-syntax prompt-at
(syntax-rules ()
[(prompt-at tag expr0 expr (... ...))
(call-with-prompt (lambda () expr0 expr (... ...)) tag)])))]))
(define call-with-control
(make-call-with-control abort-current-continuation/keep-prompt))
(define-prompt-macros prompt prompt-at call-with-continuation-prompt)
(define-syntax define-control-macros
(syntax-rules ()
[(_ control control-at call-with-control)
(begin
(define-syntax (control stx)
(syntax-case stx ()
[(control id expr0 expr (... ...))
(identifier? #'id)
#'(call-with-control (lambda (id) expr0 expr (... ...)))]))
(define-syntax (control-at stx)
(syntax-case stx ()
[(control-at tag id expr0 expr (... ...))
(identifier? #'id)
#'(call-with-control (lambda (id) expr0 expr (... ...)) tag)])))]))
;; ----------------------------------------
;; Danvy & Filinski, LFP'90
(define-control-macros control control-at call-with-control)
;; call-with-shift, parameterized over whether to keep the prompt
;; (if the prompt's handler gives us the option of removing it),
;; and whether the new one is removable:
(define (make-call-with-shift abort-cc inserted-handler)
(letrec ([call-with-shift
(case-lambda
[(f) (call-with-shift f (default-continuation-prompt-tag))]
[(f tag)
(call-with-composable-continuation
(lambda (k)
(abort-cc
tag
(lambda ()
(f (lambda vals
(call-with-continuation-prompt
(lambda ()
(apply k vals))
tag
inserted-handler))))))
tag)])])
call-with-shift))
(define-syntax define-prompt-macros
(syntax-rules ()
[(_ prompt prompt-at call-with-prompt)
(begin
(define-syntax prompt
(syntax-rules ()
[(prompt expr0 expr (... ...))
(call-with-prompt (lambda () expr0 expr (... ...)))]))
(define-syntax prompt-at
(syntax-rules ()
[(prompt-at tag expr0 expr (... ...))
(call-with-prompt (lambda () expr0 expr (... ...)) tag)])))]))
(define call-with-shift
(make-call-with-shift abort-current-continuation/keep-prompt #f))
(define-prompt-macros prompt prompt-at call-with-continuation-prompt)
(define-control-macros shift shift-at call-with-shift)
;; ----------------------------------------
;; Danvy & Filinski, LFP'90
(define-prompt-macros reset reset-at call-with-continuation-prompt)
;; ----------------------------------------
;; Shan, SCHEME'04
;; Kiselyov, Indiana CS TR-611, 2005
;;
;; The `control0' and `shift0' here are closer to Kiselyov, in that
;; `control0' and `shift0' only behave as in Shan when paired with
;; `prompt0' or `reset0' (which are two names for the same thing).
;; When paired with `prompt' or `reset' (again, the same thing),
;; they act like `control' and `shift'.
;;
;; This difference is intentional. The programmer that inserts a
;; prompt should choose whether the current continuation is visible
;; or not. Note, also, that `control' and `shift' work whether
;; they're paired with `prompt'/`reset' or `prompt0'/`reset0'.
(define call-with-control0
;; Uses abort-current-continuation, so that the prompt
;; is removed --- if the prompt is willing to be removed.
(make-call-with-control abort-current-continuation))
(define call-with-shift0
;; Uses abort-current-continuation, so that the prompt
;; is removed --- if the prompt is willing to be removed.
;; The prompt installed with the captured continuation is
;; itself willing to be removed.
(make-call-with-shift abort-current-continuation (lambda (thunk) (thunk))))
(define-control-macros control0 control0-at call-with-control0)
(define-control-macros shift0 shift0-at call-with-shift0)
(define call-with-prompt0
(case-lambda
[(thunk) (call-with-prompt0 thunk (default-continuation-prompt-tag))]
[(thunk tag)
(call-with-continuation-prompt thunk tag (lambda (thunk) (thunk)))]))
(define-prompt-macros prompt0 prompt0-at call-with-prompt0)
(define-prompt-macros reset0 reset0-at call-with-prompt0)
;; ----------------------------------------
;; Hieb & Dybvig, PPOPP'90
(define (spawn f)
(let ([p (make-continuation-prompt-tag)])
(call-with-continuation-prompt
(lambda ()
(f (lambda (f)
;; call-with-shift, parameterized over whether to keep the prompt
;; (if the prompt's handler gives us the option of removing it),
;; and whether the new one is removable:
(define (make-call-with-shift abort-cc inserted-handler)
(letrec ([call-with-shift
(case-lambda
[(f) (call-with-shift f (default-continuation-prompt-tag))]
[(f tag)
(call-with-composable-continuation
(lambda (k)
(abort-current-continuation
p
(abort-cc
tag
(lambda ()
(f (lambda vals
(call-with-continuation-prompt
(lambda ()
(apply k vals))
p
(lambda (thunk) (thunk))))))))
p))))
p
(lambda (thunk) (thunk)))))
tag
inserted-handler))))))
tag)])])
call-with-shift))
;; ----------------------------------------
;; Queinnec & Serpette, POPL'91
(define call-with-shift
(make-call-with-shift abort-current-continuation/keep-prompt #f))
(define (splitter receiver)
(let ([p (make-continuation-prompt-tag)])
(call-with-continuation-prompt
(lambda ()
(receiver (lambda (thunk)
(abort-current-continuation
p
thunk))
(lambda (proc)
(call-with-composable-continuation
proc
p))))
p
(lambda (thunk) (thunk)))))
(define-control-macros shift shift-at call-with-shift)
;; ----------------------------------------
;; Gunter, Remy, & Rieke, FPLCA'95
;; Unfortunately, the "prompt"s in Gunter et al. are what
;; we call "prompt tags". In our terminology, a "prompt"
;; is a tagged instance in a continuation.
(define-prompt-macros reset reset-at call-with-continuation-prompt)
(define (new-prompt) (make-continuation-prompt-tag))
;; ----------------------------------------
;; Shan, SCHEME'04
;; Kiselyov, Indiana CS TR-611, 2005
;;
;; The `control0' and `shift0' here are closer to Kiselyov, in that
;; `control0' and `shift0' only behave as in Shan when paired with
;; `prompt0' or `reset0' (which are two names for the same thing).
;; When paired with `prompt' or `reset' (again, the same thing),
;; they act like `control' and `shift'.
;;
;; This difference is intentional. The programmer that inserts a
;; prompt should choose whether the current continuation is visible
;; or not. Note, also, that `control' and `shift' work whether
;; they're paired with `prompt'/`reset' or `prompt0'/`reset0'.
(define-syntax set (make-rename-transformer #'prompt0-at))
(define call-with-control0
;; Uses abort-current-continuation, so that the prompt
;; is removed --- if the prompt is willing to be removed.
(make-call-with-control abort-current-continuation))
(define-syntax cupto (make-rename-transformer #'control0-at))
(define call-with-shift0
;; Uses abort-current-continuation, so that the prompt
;; is removed --- if the prompt is willing to be removed.
;; The prompt installed with the captured continuation is
;; itself willing to be removed.
(make-call-with-shift abort-current-continuation (lambda (thunk) (thunk))))
(define-control-macros control0 control0-at call-with-control0)
(define-control-macros shift0 shift0-at call-with-shift0)
(define call-with-prompt0
(case-lambda
[(thunk) (call-with-prompt0 thunk (default-continuation-prompt-tag))]
[(thunk tag)
(call-with-continuation-prompt thunk tag (lambda (thunk) (thunk)))]))
(define-prompt-macros prompt0 prompt0-at call-with-prompt0)
(define-prompt-macros reset0 reset0-at call-with-prompt0)
;; ----------------------------------------
;; Hieb & Dybvig, PPOPP'90
(define (spawn f)
(let ([p (make-continuation-prompt-tag)])
(call-with-continuation-prompt
(lambda ()
(f (lambda (f)
(call-with-composable-continuation
(lambda (k)
(abort-current-continuation
p
(lambda ()
(f (lambda vals
(call-with-continuation-prompt
(lambda ()
(apply k vals))
p
(lambda (thunk) (thunk))))))))
p))))
p
(lambda (thunk) (thunk)))))
;; ----------------------------------------
;; Queinnec & Serpette, POPL'91
(define (splitter receiver)
(let ([p (make-continuation-prompt-tag)])
(call-with-continuation-prompt
(lambda ()
(receiver (lambda (thunk)
(abort-current-continuation
p
thunk))
(lambda (proc)
(call-with-composable-continuation
proc
p))))
p
(lambda (thunk) (thunk)))))
;; ----------------------------------------
;; Gunter, Remy, & Rieke, FPLCA'95
;; Unfortunately, the "prompt"s in Gunter et al. are what
;; we call "prompt tags". In our terminology, a "prompt"
;; is a tagged instance in a continuation.
(define (new-prompt) (make-continuation-prompt-tag))
(define-syntax set (make-rename-transformer #'prompt0-at))
(define-syntax cupto (make-rename-transformer #'control0-at))
;; ----------------------------------------
;; ----------------------------------------
)