[REBOL] Re: Functional programming in REBOL
From: lmecir:mbox:vol:cz at: 9-Aug-2001 14:34
Hi again,
two other variants of the CFUNC function:
comment {var1}
use [values pass-values in-new-context] [
pass-values: func [
{pass values to locals and do body}
[throw]
locals
body
] [
set/any locals values
do body
]
in-new-context: func [
{do body with locals in new context}
[throw]
locals
body
] [
values: make block! length? locals
foreach word locals [
insert/only tail values get/any word
]
use locals copy/deep reduce [
:pass-values locals body
]
]
cfunc: function [
{make a closure}
[catch]
spec [block!]
body [block!]
] [locals] [
locals: copy []
foreach item spec [
if all [any-word? :item not set-word? :item] [
append locals to word! :item
]
]
throw-on-error [
func spec reduce [
:in-new-context locals body
]
]
]
]
comment {var 2}
use [in-new-context] [
in-new-context: function [
{do body with locals in new context}
[throw]
locals
spec
body
] [statement] [
statement: make block! 1 + length? locals
append statement func spec body
foreach word locals [
insert/only tail statement get/any word
]
do statement
]
cfunc: function [
{make a closure}
[catch]
spec [block!]
body [block!]
] [locals spec2] [
locals: copy []
spec2: copy [[throw]]
foreach item spec [
if all [any-word? :item not set-word? :item] [
append locals to word! :item
append spec2 reduce [to lit-word! :item [any-type!]]
]
]
throw-on-error [
func spec reduce [
:in-new-context locals spec2 body
]
]
]
]
