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-rw-r--r--stdlib/enum.tl46
1 files changed, 46 insertions, 0 deletions
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+;; Copyright 2025
+;; Kaz Kylheku <kaz@kylheku.com>
+;; Vancouver, Canada
+;; All rights reserved.
+;;
+;; Redistribution and use in source and binary forms, with or without
+;; modification, are permitted provided that the following conditions are met:
+;;
+;; 1. Redistributions of source code must retain the above copyright notice,
+;; this list of conditions and the following disclaimer.
+;;
+;; 2. Redistributions in binary form must reproduce the above copyright notice,
+;; this list of conditions and the following disclaimer in the documentation
+;; and/or other materials provided with the distribution.
+;;
+;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+;; AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+;; IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+;; ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+;; LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+;; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+;; SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+;; INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+;; CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+;; ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+;; POSSIBILITY OF SUCH DAMAGE.
+
+(defun normalize-enum-pairs (f enum-pairs)
+ (let ((n 0))
+ (keep-matches (@(or (@sym @init)
+ @(with @sym init n))
+ enum-pairs)
+ (unless (bindable sym)
+ (compile-error f "~s isn't a bindable symbol" sym))
+ (unless (or (integerp init) (chrp init))
+ (compile-error f "~s must be an integer or character" init))
+ (set n (succ init))
+ ^(,sym ,init))))
+
+(defmacro defenum (:form f . enum-pairs)
+ (let ((nep (normalize-enum-pairs f enum-pairs)))
+ ^(progn ,*(mapcar (op cons 'defsymacro) nep))))
+
+(defmacro enumlet (:form f enum-pairs . body)
+ (let ((nep (normalize-enum-pairs f enum-pairs)))
+ ^(symacrolet ,nep ,*body)))