scsh-0.6/scheme/srfi/srfi-11.scm

39 lines
1.2 KiB
Scheme

; Taken directly from the SRFI document.
(define-syntax let-values
(syntax-rules ()
((let-values (?binding ...) ?body0 ?body1 ...)
(let-values "bind" (?binding ...) () (begin ?body0 ?body1 ...)))
((let-values "bind" () ?tmps ?body)
(let ?tmps ?body))
((let-values "bind" ((?b0 ?e0) ?binding ...) ?tmps ?body)
(let-values "mktmp" ?b0 ?e0 () (?binding ...) ?tmps ?body))
((let-values "mktmp" () ?e0 ?args ?bindings ?tmps ?body)
(call-with-values
(lambda () ?e0)
(lambda ?args
(let-values "bind" ?bindings ?tmps ?body))))
((let-values "mktmp" (?a . ?b) ?e0 (?arg ...) ?bindings (?tmp ...) ?body)
(let-values "mktmp" ?b ?e0 (?arg ... x) ?bindings (?tmp ... (?a x)) ?body))
((let-values "mktmp" ?a ?e0 (?arg ...) ?bindings (?tmp ...) ?body)
(call-with-values
(lambda () ?e0)
(lambda (?arg ... . x)
(let-values "bind" ?bindings (?tmp ... (?a x)) ?body))))))
(define-syntax let*-values
(syntax-rules ()
((let*-values () ?body0 ?body1 ...)
(begin ?body0 ?body1 ...))
((let*-values (?binding0 ?binding1 ...) ?body0 ?body1 ...)
(let-values (?binding0)
(let*-values (?binding1 ...) ?body0 ?body1 ...)))))