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-rw-r--r--gtwiwtg.lisp16
1 files changed, 14 insertions, 2 deletions
diff --git a/gtwiwtg.lisp b/gtwiwtg.lisp
index fe60d53..35f830d 100644
--- a/gtwiwtg.lisp
+++ b/gtwiwtg.lisp
@@ -182,7 +182,7 @@ of the sequence."
:sequence sequence
:index (1- start))))
-(defun from-thunk-until (thunk &optional (until (constantly nil)) clean-up)
+(defun from-thunk-until (thunk &key (until (constantly nil)) clean-up)
"Creates a generator that produces a series of value by successively
calling (FUNCALL THUNK). The iterator stops whenever (FUNCALL UNTIL)
is non null.
@@ -374,8 +374,10 @@ Error Conditions:
(from-thunk-until
(lambda ()
(apply map-fn (mapcar #'next all-gens)))
+ :until
(lambda ()
(some (complement #'has-next-p) all-gens)) ; when at least one has no next value
+ :clean-up
(lambda ()
(dolist (g all-gens) (stop g))))))
@@ -390,6 +392,8 @@ Error Condition:
(let (on-deck)
(from-thunk-until
(lambda () on-deck) ; consumers always call has-next-p before next
+
+ :until
(lambda ()
(loop
:while (has-next-p gen)
@@ -399,6 +403,8 @@ Error Condition:
(setf on-deck candidate)
(return nil)) ; Don't stop generating, we found one
:finally (return t))) ; Stop generating, we can't find one.
+
+ :clean-up
(lambda ()
(stop gen)))))
@@ -434,6 +440,7 @@ Error Conditions:
(from-thunk-until
(lambda () (next sub-gen))
+ :until
(lambda ()
(loop
:until (has-next-p sub-gen)
@@ -446,7 +453,8 @@ Error Conditions:
;; hence:
(not (or (has-next-p sub-gen)
(has-next-p gen))))
-
+
+ :clean-up
(lambda ()
(stop gen)
(when sub-gen (stop sub-gen)))))))
@@ -509,9 +517,11 @@ Error Conditions:
all-gens)))
(car vals)))
+ :until
(lambda ()
(null all-gens))
+ :clean-up
(lambda ()
(dolist (g all-gens) (stop g))))))
@@ -590,10 +600,12 @@ Caveat:
(t (error "Attempted to get next from a spent generator."))))
+ :until
(lambda ()
(and (not (has-next-p source-generator))
(queue-empty-p local-q)))
+ :clean-up
(lambda ()
(setf (car local-stop) t)
(when (every #'car stop-cells)