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