#|$ACL2s-Preamble$;
(include-book ;; Newline to fool ACL2/cert.pl dependency scanner
 "../portcullis")
(acl2::begin-book t);$ACL2s-Preamble$|#

#|
builtin combinators (oneof, member, range) in core defdata language
author: harshrc
file name: builtin-combinators.lisp
date created: [2014-08-06 Sun]
data last modified: [2017-06-22 Thu]
|#

(in-package "DEFDATA")

(include-book "std/util/bstar" :dir :system)
(include-book "defdata-util")

(table defdata-defaults-table nil
       '((:debug       .  nil)
         (:print-commentary . t)
         (:print-summary  . nil)
         (:time-track     . t)
         (:testing-enabled . :naive)
         (:disable-non-recursive-p . nil)

; The following are quite stable and there is no reason for these to be overridden
         (:pred-suffix . "p") ;unused
         ;; (:pred-prefix . "")
         ;; (:enum-prefix . "nth-")
         ;; (:enum-suffix . "")
         ;; (:enum/acc-prefix . "nth-")
         ;; (:enum/acc-suffix . "/acc")
         (:pred-guard  .  (lambda (x) t))
         (:enum-guard  .  (lambda (x) (natp x)))
         (:enum/acc-guard . (lambda (m seed) (and (natp m) (unsigned-byte-p 63 seed))))


; The following 4 defaults shouldnt be overridden by user (of defdata
; macro) but only by implementors and extenders of defdata framework.
         (:pre-pred-hook-fns . nil)
         (:post-pred-hook-fns . nil)
         (:pre-hook-fns . nil)
         (:post-hook-fns . nil)
         )
       :clear)


; BUILTIN COMBINATOR TABLE

(defun member-pred-I (x s) `(and (member-equal ,x ,(cadr s)) t))
(defun member-enum-I (i s) `(nth (mod ,i (len ,(cadr s))) ,(cadr s)))
(defun member-enum/acc-I (i s)
  (declare (ignorable i))
  `(mv-let (idx _SEED)
           (random-index-seed (len ,(cadr s)) _SEED)
           (mv (nth idx ,(cadr s)) (the (unsigned-byte 63) _SEED))))



(defun get-tau-int (domain rexp)
  (declare (xargs :verify-guards t))
  (let ((dom (if (eq domain 'integer)
                 'integerp
               'rationalp)))
  (case-match rexp
    ((lo lo-rel-sym '_ hi-rel-sym hi)
     (b* ((lo-rel (eq lo-rel-sym '<))
          (hi-rel (eq hi-rel-sym '<))
          (lo (and (rationalp lo) lo))
          (hi (and (rationalp hi) hi)))
       (acl2::make-tau-interval dom lo-rel lo hi-rel hi))))))

(defun make-acl2-range-constraints (x domain rexp)
  (let ((dom (if (eq domain 'integer)
                 'integerp
               'rationalp)))
    (case-match rexp
      ((lo lo-rel-sym '_ hi-rel-sym hi)
       `((,dom ,x)
         ,@(and (rationalp lo) `((,lo-rel-sym ,lo ,x)))
         ,@(and (rationalp hi) `((,hi-rel-sym ,x  ,hi))))))))


;(defun range-pred-I (x s) `(acl2::in-tau-intervalp ,x ',(get-tau-int (cadr s) (third s))))
(defun range-pred-I (x s)
  `(AND . ,(make-acl2-range-constraints x (cadr s) (third s))))


(defun make-enum-body-for-range (r domain lo hi lo-rel hi-rel)
  (case domain
    (integer (let ((lo (and lo (if lo-rel (1+ lo) lo))) ;make both inclusive bounds
                   (hi (and hi (if hi-rel (1- hi) hi))))
               (cond ((and lo hi)
                      `(acl2s::nth-integer-between ,r ,lo ,hi))

                     (lo ;hi is positive infinity
                      `(+ ,lo (acl2s::nth-nat-testing ,r)))

                     ((posp hi) ;lo is neg infinity and hi is >=1
                      `(let ((i-ans (acl2s::nth-integer ,r)))
                         (if (> i-ans ,hi)
                             (mod i-ans (1+ ,hi))
                           i-ans))) ;ans shud be less than or equal to hi
                             
                             
                     (t ;lo is neg inf, and hi is <= 0
                      `(- ,hi (acl2s::nth-nat-testing ,r)))))) ;ans shud be less than or equal to hi
      
    (otherwise  (let* ((gap (/ (- (rfix hi) (rfix lo)) 1000))
                       (lo (and lo (if lo-rel (+ gap lo) lo))) ;make both inclusive bounds
                       (hi (and hi (if hi-rel (- hi gap) hi))))
                  (cond ((and lo hi)
                         `(acl2s::nth-rational-between ,r ,lo ,hi))

                        (lo ;hi is positive infinity
                         `(+ ,lo (acl2s::nth-pos-rational-testing ,r)))
                        
                        ((> hi 0) ;lo is neg infinity and hi is is >= 1
                         `(let ((rat-ans (acl2s::nth-rational ,r)))
                            (if (> rat-ans ,hi)
                                (mod rat-ans (1+ ,hi))
                              rat-ans))) ;ans shud be less than or equal to hi
                        
                        (t ;lo is neg infinity and hi is is <= 0
                         `(- ,hi (acl2s::nth-pos-rational-testing ,r))))))))

(defun range-enum-I (i s)
  (b* ((tau-interval (get-tau-int (cadr s) (third s)))
       (lo (tau-interval-lo tau-interval))
       (hi (tau-interval-hi tau-interval))
       (lo-rel (tau-interval-lo-rel tau-interval))
       (hi-rel (tau-interval-hi-rel tau-interval)))
    (make-enum-body-for-range i (cadr s) lo hi lo-rel hi-rel)))


(defun minimum-range-lo-builtin ()
  (declare (xargs :guard t))
  -1000); (- (expt 2 32)))

(defun maximum-range-hi-builtin ()
  (declare (xargs :guard t))
  1000); (+ 0 (expt 2 32)))

(defstub minimum-range-lo () => *)
(defstub maximum-range-hi () => *)
(defattach minimum-range-lo minimum-range-lo-builtin)
(defattach maximum-range-hi maximum-range-hi-builtin)
#| Sampling distribution for Bounded Ranges [2017-06-21 Wed]
.01 min, .01 max, .01 mid1, .01 mid2
    (or .02 if one mid, eg 1-4 has 2 mids: 2,3, but 1-5 has one: 3)
.10 uniform between -100 and 100 (added by harshrc)
.19 geometric around mid
.45 uniform between min-max
.1 geometric around min (ie, [min---])
.1 geometric around max (ie, [max--])
.01 geometric [max+1 ...])
.01 geometric [min-1 ...])
|#

(defun force-between (x lo hi)
  (declare (xargs :guard (and (rationalp x) (rationalp lo)
                              (rationalp hi) (<= lo hi))))
  (b* ((x (max x lo))
       (x (min x hi)))
    x))

(defconst *dist-base* 4)
(defconst *dist-expt* 3)
(defconst *dist-hi1* (expt *dist-base* *dist-expt*))
(defconst *dist-hi2* (* *dist-hi1* *dist-base*))
(defconst *dist-hi3* (* *dist-hi2* *dist-base*))
(defconst *dist-hi4* (* *dist-hi3* *dist-base*))
(defconst *dist-hi5* (* *dist-hi4* *dist-base*))

(defconst *dist-lo1* (- *dist-hi1*))
(defconst *dist-lo2* (- *dist-hi2*))
(defconst *dist-lo3* (- *dist-hi3*))
(defconst *dist-lo4* (- *dist-hi4*))
(defconst *dist-lo5* (- *dist-hi5*))

;; The keys should add up to 100
(defun sampling-dist-default (min max mid1 mid2)
  (declare (xargs :guard (and (rationalp min) (rationalp max)
                              (rationalp mid1) (rationalp mid2)
                              (<= min mid1) (<= mid1 mid2)
                              (<= mid2 max))))
  (b* ((lo-1 (force-between *dist-lo1* min max))
       (hi-1 (force-between *dist-hi1* min max))
       (lo-2 (force-between *dist-lo2* min max))
       (hi-2 (force-between *dist-hi2* min max))
       (lo-3 (force-between *dist-lo3* min max))
       (hi-3 (force-between *dist-hi3* min max))
       (lo-4 (force-between *dist-lo4* min max))
       (hi-4 (force-between *dist-hi4* min max))
       (lo-5 (force-between *dist-lo5* min max))
       (hi-5 (force-between *dist-hi5* min max))
       (mid-lo-1 (force-between (- mid1 hi-1) min max))
       (mid-hi-1 (force-between (+ mid1 hi-1) min max))
       (mid-lo-2 (force-between (- mid1 hi-2) min max))
       (mid-hi-2 (force-between (+ mid1 hi-2) min max))
       (mid-lo-3 (force-between (- mid1 hi-3) min max))
       (mid-hi-3 (force-between (+ mid1 hi-3) min max))
       (mid-lo-4 (force-between (- mid1 hi-4) min max))
       (mid-hi-4 (force-between (+ mid1 hi-4) min max))
       (mid-lo-5 (force-between (- mid1 hi-5) min max))
       (mid-hi-5 (force-between (+ mid1 hi-5) min max)))
    `((1 :eq ,min)
      (1 :eq ,max)
      (1 :eq ,mid1)
      (1 :eq ,mid2)

      (4 :uniform ,lo-1 ,hi-1)
      (4 :uniform ,lo-2 ,hi-2)
      (4 :uniform ,lo-3 ,hi-3)
      (4 :uniform ,lo-4 ,hi-4)
      (4 :uniform ,lo-5 ,hi-5)

      (4 :uniform ,mid-lo-1 ,mid-hi-1)
      (4 :uniform ,mid-lo-2 ,mid-hi-2)
      (4 :uniform ,mid-lo-3 ,mid-hi-3)
      (4 :uniform ,mid-lo-4 ,mid-hi-4)
      (4 :uniform ,mid-lo-5 ,mid-hi-5)
      
      (5 :geometric :leq-bnd ,max ,min)
      (23 :geometric :geq-bnd ,min ,max)
      (14 :geometric :between ,min ,max)

      (14 :uniform ,min ,max))))

#|

(defun test-weighted-switch-nat (wts n seed. acc)
  (if (zp n)
      (mv acc seed.)
    (b* (((mv idx (the (unsigned-byte 63) seed.))
          (defdata::random-index-seed 100 seed.))
         ((mv x &) (defdata::weighted-switch-nat wts idx))
         ((mv acc seed.) (test-weighted-switch-nat wts (1- n) seed. (update-nth x (1+ (nth x acc)) acc))))
      (mv acc seed.))))

(u::defloop list-div-mult-by (xs div mult)
            (for ((x in xs)) (collect (* (/ x div) mult))))

(defun test-weighted-switch-nat-top (wts n state)
  (declare (xargs :stobjs (state) :verify-guards nil))
  (b* ((acc (make-list (len wts) :initial-element 0))
       ((mv acc seed.) (test-weighted-switch-nat wts n (defdata::getseed state) acc))
       (state (defdata::putseed seed. state)))
    (value (list-div-mult-by acc n 100))))

(test-weighted-switch-nat-top '(1 1 1 1 29 45 10 10 1 1) 10000 state)

(defun test-enum-dist (n state)
  (declare (xargs :stobjs (state) :verify-guards nil))
  (if (zp n)
      (cw "~%")
  (b* (((mv x seed.) (NTH-SRL-INT/ACC 0 (defdata::getseed state) acc))
       (state (defdata::putseed seed. state)))
    (prog2$ (cw "~x0  " x)
            (test-enum-dist (1- n) state)))))




|#

(defun sampling-dist-lo (min max mid1 mid2)
  (declare (xargs :guard (and (rationalp min) (rationalp max)
                              (rationalp mid1) (rationalp mid2)
                              (<= min mid1) (<= mid1 mid2)
                              (<= mid2 max))))
  (sampling-dist-default min max mid1 mid2))

(defun sampling-dist-hi (min max mid1 mid2)
  (declare (xargs :guard (and (rationalp min) (rationalp max)
                              (rationalp mid1) (rationalp mid2)
                              (<= min mid1) (<= mid1 mid2)
                              (<= mid2 max))))
  (sampling-dist-default min max mid1 mid2))

(defun int-midpoints (lo hi)
  (declare (xargs :guard (and (integerp lo) (integerp hi)
                              (<= lo hi))))
  (b* ((odd? (oddp (- hi lo)))
       (mid (/ (+ hi lo) 2)))
    (if odd? (mv (- mid 1/2) (+ mid 1/2))
      (mv mid mid))))

(defun rat-midpoints (lo hi)
  (declare (xargs :guard (and (rationalp lo) (rationalp hi)
                              (<= lo hi))))
  (b* ((mid (/ (+ hi lo) 2)))
    (mv mid mid)))

(defun make-enum-exp-for-bounded-range (ivar seedvar dom sampling-dist)
  (b* ((weights (strip-cars sampling-dist))
       (ctx 'make-enum-exp-for-bounded-range)
       ((list g-rnd-fn     g-leq-fn     g-geq-fn
              g-rnd-bnd-fn g-leq-bnd-fn g-geq-bnd-fn
              g-btw-fn
              between-fn)
        (if (eq dom 'integer)
            '#!ACL2S(geometric-int-around
                     geometric-int-leq
                     geometric-int-geq
                     geometric-int-around-bnd
                     geometric-int-leq-bnd
                     geometric-int-geq-bnd
                     geometric-int-between
                     defdata::random-integer-between-seed)
          '#!ACL2S(geometric-rat-around
                   geometric-rat-leq
                   geometric-rat-geq
                   geometric-rat-around-bnd
                   geometric-rat-leq-bnd
                   geometric-rat-geq-bnd
                   geometric-rat-between
                   defdata::random-rational-between-seed))))
    `(b* (((mv idx (the (unsigned-byte 63) ,seedvar))
           (defdata::random-index-seed 100 ,seedvar))
          ((mv choice &) (defdata::weighted-switch-nat ',weights idx))
          (chosen (nth choice ',sampling-dist))
          (sp (cdr chosen)))
       (case-match sp ;sampling type dispatch
         ((':eq x)                            (mv x ,seedvar))
         ((':geometric ':around x)            (mv (,g-rnd-fn x ,ivar) ,seedvar))
         ((':geometric ':leq x)               (mv (,g-leq-fn x ,ivar) ,seedvar))
         ((':geometric ':geq x)               (mv (,g-geq-fn x ,ivar) ,seedvar))
         ((':geometric ':around-bnd x lo hi)  (mv (,g-rnd-bnd-fn x lo hi ,ivar) ,seedvar))
         ((':geometric ':leq-bnd x lo)        (mv (,g-leq-bnd-fn x lo ,ivar) ,seedvar))
         ((':geometric ':geq-bnd x hi)        (mv (,g-geq-bnd-fn x hi ,ivar) ,seedvar))
         ((':geometric ':between lo hi)       (mv (,g-btw-fn lo hi ,ivar) ,seedvar))
         ((':uniform lo hi)                   (,between-fn lo hi ,seedvar))
         (& (mv (er hard ',ctx "~| Impossible case ~x0.~%" sp) ,seedvar))))))

(defun make-enum/acc-body-for-range (ivar seedvar domain lo hi lo-rel hi-rel)
  (b* ((gap (cond ((eq domain 'integer)
                   (cond ((or (not lo) (not hi)) 1)
                         ((< lo hi) 1)
                         (t 0)))
                  ((or (not lo) (not hi)) 1/1000)
                  ((< lo hi)
                   (min 1/1000 (/ (- (rfix hi) (rfix lo)) 1000)))
                  (t 0)))
       (lo (and lo (if lo-rel (+ gap lo) lo))) ;make both inclusive bounds
       (hi (and hi (if hi-rel (- hi gap) hi)))
       (lo1 (or lo (min (minimum-range-lo) (rfix hi))))
       (hi1 (or hi (max (maximum-range-hi) (rfix lo))))
       ((mv mid1 mid2) (if (eq domain 'integer)
                           (int-midpoints lo1 hi1)
                         (rat-midpoints lo1 hi1)))
       (exp (cond ((and lo hi)
                   (make-enum-exp-for-bounded-range
                    ivar seedvar domain (sampling-dist-default lo hi mid1 mid2)))
                  (lo (make-enum-exp-for-bounded-range
                       ivar seedvar domain (sampling-dist-lo lo hi1 mid1 mid2)))
                  (t (make-enum-exp-for-bounded-range
                      ivar seedvar domain (sampling-dist-hi lo1 hi1 mid1 mid2))))))

    `(mv-let (,ivar ,seedvar)
             (random-natural-seed ,seedvar) ;;overwrite original value of ivar
             (declare (ignorable ,ivar))
             ,exp)))

(defun range-enum/acc-I (ivar s)
  (declare (ignorable ivar))
  (b* ((tau-interval (get-tau-int (cadr s) (third s)))
       (lo (tau-interval-lo tau-interval))
       (hi (tau-interval-hi tau-interval))
       (lo-rel (tau-interval-lo-rel tau-interval))
       (hi-rel (tau-interval-hi-rel tau-interval)))
    (make-enum/acc-body-for-range ivar '_SEED (cadr s) lo hi lo-rel hi-rel)))


(defun make-defconst-event1 (p top-kwd-alist wrld)
  (declare (ignorable top-kwd-alist wrld))
  (b* (((cons tname A) p)
       ((acl2::assocs ndef) A)
       (nbody ndef)
       (curr-pkg (get1 :current-package top-kwd-alist))
       (name (s+ "*" tname "-VALUES*" :pkg curr-pkg)))
    (if (and (consp nbody)
             (eq 'or (car nbody))
             (rquote-listp (cdr nbody)))
        `((def-const ,name ',(unrquote-lst (cdr nbody))))
      '())))

(defloop member-defconst-event (ps kwd-alist wrld)
  (for ((p in ps)) (append (make-defconst-event1  p kwd-alist wrld))))

(add-pre-post-hook defdata-defaults-table :pre-pred-hook-fns '(member-defconst-event))

#!ACL2S
(table defdata::builtin-combinator-table nil
       '((or . ((:aliases . (oneof or anyof acl2::or acl2::oneof acl2::anyof))
                (:arity . t)
                (:pred-I . nil) ; no special handling.
                (:pred-inverse-I . nil)
                (:enum-I . nil)
                (:enum/acc-I . nil)))

         (member . ((:aliases . (enum member member-eq member-equal in acl2::enum acl2::in))
                    (:arity . 1)
                    (:pred-I . defdata::member-pred-I)
                    (:pred-inverse-I . nil)
                    (:enum-I . defdata::member-enum-I)
                    (:enum/acc-I . defdata::member-enum/acc-I)
                    ))

         (range . ((:aliases . (range between acl2::range acl2::between))
                   (:arity . 2)
                   (:pred-I . defdata::range-pred-I)
                   (:pred-inverse-I . nil)
                   (:enum-I . defdata::range-enum-I)
                   (:enum/acc-I . defdata::range-enum/acc-I))))

       :clear)




;copied from cgen./utilities


; Matt K. mod, 10/2017: Since ev-fncall-w is called in my-ev-w but is now
; untouchable, a change is necessary.  Fortunately, cert.acl2 specifies :ttags
; :all, so we can introduce a trust tag to remove ev-fncall-w as an
; untouchable.  An alternate solution, not yet tried (at least by me), is to
; use ev-fncall-w! instead; but that might slow things down a lot because of
; the extra checking done.  Note that magic-ev-fncall isn't an option, because
; state isn't available in my-ev-w.

(defttag :ev-fncall-w-ok)
(remove-untouchable acl2::ev-fncall-w t)
(defttag nil)

(mutual-recursion
;(ev-fncall-w FN ARGS W SAFE-MODE GC-OFF HARD-ERROR-RETURNS-NILP AOK)
;I use sumners default values for
;               nil    ; safe-mode
;               t      ; gc-off
;               nil    ; hard-error-returns-nilp
;               nil    ; aok


(defun my-ev-w (term alist ctx w hard-error-returns-nilp)
"special eval function that does not need state and
cannot handle if, return-last,mv-list, stobjs, wormhole etc
very restrictive
Mainly to be used for evaluating enum lists "
;Close to ev-rec in translate.lisp
(declare (xargs :mode :program
                :guard (and (acl2::termp term w)
                            (plist-worldp w)
                            (symbol-alistp alist)
                            (booleanp hard-error-returns-nilp))))

(b* (((when (acl2::variablep term))
;variable expression
      (let ((v (assoc-eq term alist))) ;bugfix (removed cdr).
;(earlier, if term had a value NIL, we were errorneusly
;crashing!!!
        (if v ;not null
          (mv nil (cdr v))
          (prog2$
           (er hard ctx "Unbound variable ~x0.~%" term)
           (mv t term)))))
;quoted expression
     ((when (acl2::fquotep term))
      (mv nil (cadr term)))
;if expression
     ((when (eq (car term) 'if))
      (prog2$
       (er hard ctx "IF expressions not supported at the moment.~%")
       (mv t term)))
;function expression
     ((mv args-er args)
      (my-ev-w-lst (cdr term) alist ctx
                   w hard-error-returns-nilp))
     ((when args-er)
      (prog2$
       (er hard ctx "Eval args failed~%")
       (mv t term)))
     ((when (acl2::flambda-applicationp term))
      (my-ev-w (acl2::lambda-body (car term))
               (acl2::pairlis$ (acl2::lambda-formals (car term)) args)
               ctx w hard-error-returns-nilp)))
    (acl2::ev-fncall-w (car term) args w
                       nil nil t hard-error-returns-nilp nil)))

(defun my-ev-w-lst (term-lst alist
                             ctx w hard-error-returns-nilp)
"special eval function that does not need state and
cannot handle return-last,mv-list, stobjs, wormhole etc
very restrictive
Mainly to be used for evaluating enum lists "
;Close to ev-rec-lst in translate.lisp
(declare (xargs :mode :program
                :guard (and (acl2::term-listp term-lst w)
                            (plist-worldp w)
                            (symbol-alistp alist)
                            (booleanp hard-error-returns-nilp))))
(if (endp term-lst)
    (mv nil nil)
  (b* (((mv erp1 car-ans)
        (my-ev-w (car term-lst) alist
                 ctx w hard-error-returns-nilp))
       ((when erp1)
        (prog2$
         (er hard ctx "eval ~x0 failed~%" (car term-lst))
         (mv t term-lst)))
       ((mv erp2 cdr-ans)
        (my-ev-w-lst (cdr term-lst) alist
                     ctx w hard-error-returns-nilp))
       ((when erp2)
        (prog2$
         (er hard ctx "eval failed~%")
         (mv t term-lst))))
    (mv nil (cons car-ans cdr-ans)))))
)

(push-untouchable acl2::ev-fncall-w t) ; see Matt K. comment above

(defun trans-my-ev-w (form ctx w hard-error-returns-nilp)
  (declare (xargs :mode :program
                  :guard (and (plist-worldp w)
                              (booleanp hard-error-returns-nilp))))

  (mv-let
   (erp term x)
; Matt K. mod for df additions: Added nil for known-dfs argument.
   (acl2::translate11 form nil nil nil nil nil nil nil
                      ctx w (acl2::default-state-vars nil))
   (declare (ignore x))
   (if erp
       (if hard-error-returns-nilp
           (mv erp form)
         (prog2$
          (er hard ctx "~x0 could not be translated.~%" form)
          (mv erp form)))
     (my-ev-w term nil ctx w hard-error-returns-nilp))))


(defun bad-range-syntax (rexp)
  (er hard? 'parse-range-exp
"~| Range exp ~x0 is not of the following form: ~
     ~| (lo < _ < hi) or (lo < _ < hi)  where ~
     ~| <= can be used as the comparison relation and one of the comparisons can be dropped i.e ~
     ~| (lo <= _), (_ <= hi) etc.~%" rexp))


(set-ignore-ok t)
;TODO BAD idea to rely on symbols for < and <= (ACL2S B::< is different from <
;here -- this caused a bug)
;; (defun preprocess-range-exp (rexp)
;;   (case-match rexp
;;     ((lo '< '_ '< hi) rexp)
;;     ((lo '< '_ '<= hi) rexp)
;;     ((lo '<= '_ '< hi) rexp)
;;     ((lo '<= '_ '<= hi) rexp)

;;     ((lo '< '_) `(,lo < _ < nil))
;;     (('_ '< hi) `(nil < _ < ,hi))


;;     ((lo '<= '_) `(,lo <= _ < nil))
;;     (('_ '<= hi) `(nil < _ <= ,hi))
;;     (& rexp)))

(defun pp-rel (rel-sym)
  (if (equal (symbol-name rel-sym) "<")
      '<
    '<=))

(defun pp-range-exp (rexp)
  "preprocess range expression"
  (case-match rexp
    ((lo lo-rel '_ hi-rel hi) (list lo (pp-rel lo-rel) '_ (pp-rel hi-rel) hi))
    ((lo lo-rel '_)           (list lo (pp-rel lo-rel) '_ '< nil))
    (('_ hi-rel hi)           (list nil '< '_ (pp-rel hi-rel) hi))

    (& (bad-range-syntax rexp))))

(set-ignore-ok nil)

(defun parse-range-exp (rexp1 domain ctx wrld)
  (declare (xargs :mode :program))
  (let ((rexp (pp-range-exp rexp1)))
  (case-match rexp
    ((lo-sym lo-rel-sym '_ hi-rel-sym hi-sym)
     (b* ((lo-rel (not (eq lo-rel-sym '<=)))
          (hi-rel (not (eq hi-rel-sym '<=)))
          ((mv erp hi)
           (trans-my-ev-w hi-sym ctx wrld nil))
          ((when erp)
           (er hard ctx "Evaluating rational expression ~x0 failed!~%" hi-sym))
          ((mv erp lo)
           (trans-my-ev-w lo-sym ctx wrld nil))
          ((when erp)
           (er hard ctx "Evaluating rational expression ~x0 failed!~%" lo-sym))
          ((unless (and (or (null lo) (if (eq domain 'integer) (integerp lo) (rationalp lo)))
                        (or (null hi) (if (eq domain 'integer) (integerp hi) (rationalp hi)))
                        (not (and (null lo) (null hi)))))
           (er hard ctx "~| lo and hi in range expressions should evaluate to rationals, but instead got lo = ~x0 and hi = ~x1~%" lo hi))

          ((mv lo lo-rel) (if (eq domain 'integer)
                              (if (and lo lo-rel)
                                  (mv (+ lo 1) nil)
                                (mv lo nil))
                            (mv lo lo-rel)))
          ((mv hi hi-rel) (if (eq domain 'integer)
                              (if (and hi hi-rel)
                                  (mv (- hi 1) nil)
                                (mv hi nil))
                            (mv hi hi-rel)))

          ((when (and lo hi (eq domain 'integer) (> lo hi)))
           (er hard ctx "~| lo <= hi should hold. But it does not: lo = ~x0 and hi = ~x1" lo hi))

          ((when (and lo hi (not lo-rel) (not hi-rel) (= lo hi))) lo)

          ((when (and lo hi (or lo-rel hi-rel) (>= lo hi)))
           (er hard ctx "~| lo < hi should hold. But it does not: lo = ~x0 and hi = ~x1" lo hi))

          (lo-rel-sym (if lo-rel '< '<=))
          (hi-rel-sym (if hi-rel '< '<=)))

       (list 'range domain (list lo lo-rel-sym '_ hi-rel-sym hi))))
    (& (bad-range-syntax rexp1)))))

#|
(defun parse-enum-exp (eexp ctx w)
  (declare (xargs :mode :program))
  (b* (((when (proper-symbolp eexp)) eexp) ;name TODO.Bug -- But what if its not a name! We should catch this error...
       ((mv erp list-val) (trans-my-ev-w eexp ctx w nil))
       ((when erp)
        (er hard ctx "Evaluating list expression ~x0 failed!~%" eexp))
       ((unless (and (true-listp list-val) (consp list-val)))
        (er hard ctx "Enum argument ~x0 expected to be a non-empty list expression.~%" eexp)))
    (list 'member (kwote list-val))))
|#

;; This removes duplicate elements and uses 'or, which works better
;; with tau because we can exactly characterize the type.
(defun parse-enum-exp (eexp ctx w)
  (declare (xargs :mode :program))
  (b* (((when (proper-symbolp eexp)) eexp) ;name TODO.Bug -- But what if its not a name! We should catch this error...
       ((mv erp list-val) (trans-my-ev-w eexp ctx w nil))
       ((when erp)
        (er hard ctx "Evaluating list expression ~x0 failed!~%" eexp))
       ((unless (and (true-listp list-val) (consp list-val)))
        (er hard ctx "Enum argument ~x0 expected to be a non-empty list expression.~%" eexp))
       (list-val (remove-duplicates list-val)))
    (if (consp (cdr list-val))
        (cons 'or (kwote-lst list-val))
      (kwote (car list-val)))))
