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-rw-r--r--2d/coroutine.scm54
1 files changed, 32 insertions, 22 deletions
diff --git a/2d/coroutine.scm b/2d/coroutine.scm
index ada6ddf..04c2235 100644
--- a/2d/coroutine.scm
+++ b/2d/coroutine.scm
@@ -23,13 +23,15 @@
(define-module (2d coroutine)
#:export (coroutine
- define-coroutine
+ colambda
+ codefine
+ codefine*
wait)
#:replace (yield)
#:use-module (2d agenda))
-(define (execute-coroutine thunk)
- "Creates a procedure that can yield a continuation."
+(define (coroutine thunk)
+ "Calls a procedure that can yield a continuation."
(define (handler cont callback . args)
(define (resume . args)
;; Call continuation that resumes the procedure.
@@ -42,26 +44,34 @@
;; Call procedure.
(call-with-prompt 'coroutine-prompt thunk handler))
-;; emacs: (put 'coroutine 'scheme-indent-function 0)
-(define-syntax-rule (coroutine body ...)
- (begin
- (agenda-schedule
- (lambda ()
- (execute-coroutine
- (lambda () body ...))))))
+;; emacs: (put 'colambda 'scheme-indent-function 0)
+(define-syntax-rule (colambda args body ...)
+ "Syntacic sugar for a lambda that is run as a coroutine."
+ (lambda args
+ (coroutine
+ (lambda () body ...))))
-;; emacs: (put 'define-coroutine 'scheme-indent-function 1)
-(define-syntax define-coroutine
- (syntax-rules ()
- ((_ (name . args) . body)
- ;; Outer define for the execute-coroutine call.
- (define (name . args)
- ;; Make a new procedure with the same signature so that a
- ;; recursive procedure can be created without starting a new
- ;; coroutine with each call to itself.
- (define (name . args) . body)
- ;; Coroutine time.
- (execute-coroutine (lambda () (name . args)))))))
+;; emacs: (put 'codefine 'scheme-indent-function 1)
+(define-syntax-rule (codefine (name ...) . body)
+ "Syntactic sugar for defining a procedure that is run as a
+coroutine."
+ (define (name ...)
+ ;; Create an inner procedure with the same signature so that a
+ ;; recursive procedure call does not create a new prompt.
+ (define (name ...) . body)
+ (coroutine
+ (lambda () (name ...)))))
+
+;; emacs: (put 'codefine* 'scheme-indent-function 1)
+(define-syntax-rule (codefine* (name ...) . body)
+ "Syntactic sugar for defining a procedure with optional and
+keyword arguments that is run as a coroutine."
+ (define* (name ...)
+ ;; Create an inner procedure with the same signature so that a
+ ;; recursive procedure call does not create a new prompt.
+ (define* (name ...) . body)
+ (coroutine
+ (lambda () (name ...)))))
(define (yield callback)
"Yield continuation to a callback procedure."