This egg provides an implementation of SRFI-145.
- (assume OBJ MESSAGE ...)syntax
Evaluates to the value of OBJ if OBJ evaluates to a true value. It is an error if OBJ evaluates to a false value. In this case the error is reported with the remaining MESSAGE arguments and if possible, including the source location of the source of the error.
(assume OBJ MESSAGE ...) expands to (assert OBJ MESSAGE ...). Therefore the assume form may be optimized away if OBJ is guaranteed to evaluate to a true value and is always elided in unsafe mode. For this reason it is not to be used as a replacement for error or type checking, but as a development tool to document assumptions made about code.
(import scheme) (import (chicken base)) (import (srfi 145)) ;; adapted from list-utils egg (define (list-copy* ls #!optional (start 0) (end (length ls)) (fill (void))) (unless (<= start end) (error 'list-copy* "start > end" start end)) (let* ((tot (- end start)) (end (min end (length ls))) (len (- end start)) (ls (take (drop ls start) len))) (assume (<= tot len) "Sublist length exceeds list length" tot len) (append! ls (make-list (- tot len) fill)))) ;; adapted from https://www.upyum.com/cgit.cgi/ensemble/tree/backend/matrix/data.scm#n72 (define (timeline-cons event timeline) (assume (timeline-event? event) "Not a timeline event" event) (assume (or (not (hole-event? event)) (null? timeline) (checkpoint-event? (car timeline))) "Hole event doesn't follow checkpoint event" event) (cons event timeline))
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- Initial release