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| author | David Thompson <dthompson2@worcester.edu> | 2014-08-25 19:28:44 -0400 |
|---|---|---|
| committer | David Thompson <dthompson2@worcester.edu> | 2014-08-25 19:30:25 -0400 |
| commit | 5361a105fdcb097def20caa980b1956973810b94 (patch) | |
| tree | 592e3360e287da6a759534c148f5ae8288b46f88 | |
| parent | 9162ea9ab57e48cfb32216d5b8910252f036457d (diff) | |
Add signal-let and signal-let* forms.
* sly/signal.scm (signal-let, signal-let*): New macros.
| -rw-r--r-- | sly/signal.scm | 12 |
1 files changed, 12 insertions, 0 deletions
diff --git a/sly/signal.scm b/sly/signal.scm index 41dddf2..a3e79c4 100644 --- a/sly/signal.scm +++ b/sly/signal.scm @@ -29,6 +29,7 @@ #:export (signal? make-signal define-signal + signal-let signal-let* hook->signal signal-ref signal-ref-maybe @@ -167,6 +168,17 @@ be coerced into one." ((_ name value) #'(define name (make-signal-maybe value)))))) +(define-syntax-rule (signal-let ((var signal) ...) body ...) + ((lambda (var ...) body ...) (signal-ref signal) ...)) + +(define-syntax signal-let* + (syntax-rules () + ((_ ((var signal)) body ...) + (signal-let ((var signal)) body ...)) + ((_ ((var signal) . rest) body ...) + (signal-let ((var signal)) + (signal-let* rest body ...))))) + ;;; ;;; Higher Order Signals ;;; |