From 64f037d91e0c9296dcaef9a0ff3eb33b19a2ed34 Mon Sep 17 00:00:00 2001 From: Bryan Newbold Date: Mon, 20 Feb 2017 00:05:38 -0800 Subject: Import Upstream version 3a5 --- srfi-11.scm | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+) create mode 100644 srfi-11.scm (limited to 'srfi-11.scm') diff --git a/srfi-11.scm b/srfi-11.scm new file mode 100644 index 0000000..366e12e --- /dev/null +++ b/srfi-11.scm @@ -0,0 +1,38 @@ +;;; This code is in the public domain. +;;; http://srfi.schemers.org/srfi-11/srfi-11.html +;;; by Lars T. Hansen 1999 + +(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 ...))))) -- cgit v1.2.3