make library hierarchy again

1 files changed, 57 insertions, 0 deletions

diff --git a/lib/SAHP.scm b/lib/SAHP.scm
new file mode 100644
index 0000000..3e60956
--- /dev/null
+++ b/lib/SAHP.scm
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+#| Copyright 2024 Peter McGoron
+ |
+ | Licensed under the Apache License, Version 2.0 (the "License");
+ |
+ | you may not use this file except in compliance with the License.
+ | You may obtain a copy of the License at
+ |
+ |     http://www.apache.org/licenses/LICENSE-2.0
+ |
+ | Unless required by applicable law or agreed to in writing, software
+ | distributed under the License is distributed on an "AS IS" BASIS,
+ | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ | See the License for the specific language governing permissions and
+ | limitations under the License.
+ |#
+
+;;; ;;;;;;;;;;;;
+;;; API
+;;; ;;;;;;;;;;;;
+
+(define (set-global-SAHP! SAHP type procedure)
+  (%SAHP-add-to-global/subtypes (extract-SAHP-descriptor SAHP)
+                                type
+                                procedure))
+
+(define-syntax define-global-SAHP
+  (syntax-rules ()
+    ((_ (name (type arg1) . arg-rest) body ...)
+     (set-global-SAHP! name
+                       type
+                       (lambda (arg1 . arg-rest)
+                         body ...)))))
+
+(define-syntax parameterize-SAHP
+  (syntax-rules ()
+    ((_ ((SAHP (type value) ...) ...) body ...)
+     (let ((param (SAHP-dynamic-scope-parameter (extract-SAHP-descriptor
+                                                 SAHP)))
+           ...)
+       (parameterize ((param (%SAHP-set/subtypes (param)
+                                                 (list type ...)
+                                                 (list value ...)))
+                      ...)
+         body ...)))))
+
+(define-syntax letrec-SAHP
+  (syntax-rules ()
+    ((_ ((SAHP (type value) ...) ...) body ...)
+     (let ((%SAHP (extract-SAHP-descriptor SAHP)) ...)
+       (letrec ((SAHP (%SAHP/local-scope
+                       %SAHP
+                       (%SAHP-set/subtypes (SAHP-local-scope
+                                            %SAHP)
+                                           (list type ...)
+                                           (list value ...))))
+                ...)
+         body ...)))))