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| author | Kaz Kylheku <kaz@kylheku.com> | 2015-09-29 20:13:43 -0700 |
|---|---|---|
| committer | Kaz Kylheku <kaz@kylheku.com> | 2015-09-29 20:13:43 -0700 |
| commit | afb400eff15e7c77c5dd0fa5e35d91173f8df1ad (patch) | |
| tree | b29f3217396cdc2b04a55a16721f81d6ce4f43ba /share | |
| parent | 111650e235ab2e529fa1529b1c9a23688a11cd1f (diff) | |
| download | txr-afb400eff15e7c77c5dd0fa5e35d91173f8df1ad.tar.gz txr-afb400eff15e7c77c5dd0fa5e35d91173f8df1ad.tar.bz2 txr-afb400eff15e7c77c5dd0fa5e35d91173f8df1ad.zip | |
struct :init :fini specifiers.
* share/txr/stdlib/struct.tl (defstruct): New (:init ...) and
(:fini ...) syntax can be used in the slot list to specify
an initialization function and a gc-finalization function.
* txr.1: Documented.
Diffstat (limited to 'share')
| -rw-r--r-- | share/txr/stdlib/struct.tl | 38 |
1 files changed, 35 insertions, 3 deletions
diff --git a/share/txr/stdlib/struct.tl b/share/txr/stdlib/struct.tl index 6bef4919..d1e42d2a 100644 --- a/share/txr/stdlib/struct.tl +++ b/share/txr/stdlib/struct.tl @@ -35,7 +35,8 @@ (throwf 'eval-error "~s: ~s isn't a bindable symbol" 'defstruct name)) (unless (proper-listp slot-specs) (throwf 'eval-error "~s: bad slot syntax" 'defstruct)) - (let* ((slot-init-forms (collect-each ((slot slot-specs)) + (let* ((instance-init-form nil) (instance-fini-form nil) + (slot-init-forms (collect-each ((slot slot-specs)) (tree-case slot ((word name args . body) (caseq word @@ -52,7 +53,32 @@ (when body (sys:bad-slot-syntax slot)) ^(,word ,name ,args)) - (t (sys:bad-slot-syntax slot)))) + (t :))) + ((word (arg) . body) + (caseq word + (:init + (unless (bindable arg) + (sys:bad-slot-syntax slot)) + (when instance-init-form + (uw-throwf 'eval-error + "~s: duplicate :init" + 'defstruct)) + (set instance-init-form + (cons arg body)) + ^(,word nil nil)) + (:fini + (unless (bindable arg) + (sys:bad-slot-syntax slot)) + (when instance-fini-form + (uw-throwf 'eval-error + "~s: duplicate :fini" + 'defstruct)) + (set instance-fini-form + (cons arg body)) + ^(,word nil nil)) + (t (when body + (sys:bad-slot-syntax slot)) + :))) ((word name) (caseq word ((:static :instance) @@ -82,7 +108,13 @@ (let ((,type-sym (struct-type ,arg-sym))) ,*(mapcar (aret ^(unless (static-slot-p ,type-sym ',@2) (slotset ,arg-sym ',@2 ,@3))) - inst-si-forms))) + inst-si-forms)) + ,*(if (cdr instance-init-form) + ^((let ((,(car instance-init-form) ,arg-sym)) + ,*(cdr instance-init-form)))) + ,*(if (cdr instance-fini-form) + ^((finalize ,arg-sym (lambda (,(car instance-fini-form)) + ,*(cdr instance-fini-form)))))) ,(if args (let ((gens (mapcar (ret (gensym)) args))) ^(lambda (,arg-sym ,*gens) |