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Silence byte compiler warnings.
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- Add `name` to `ignore` in `loopy--defaccumulation`.

- Remove unused `cmd` from `loopy--parse-set-command`.

- Remove unused `cmd` from `loopy--parse-set-prev-command`.

- Add `loopy--pcase-flip` as a wrapper for `pcase--flip`, which was obsoleted
  in Emacs 30.

- Add documentation strings to `loopy--seq-length>` and `loopy--seq-length=`.
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@okamsn
okamsn committed Aug 16, 2024
1 parent 1c2a216 commit 6728e82
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6 changes: 3 additions & 3 deletions loopy-commands.el
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Original file line number Diff line number Diff line change
Expand Up @@ -139,7 +139,7 @@ handled by `loopy-iter'."

;;;;; Genereric Evaluation
;;;;;; Set
(cl-defun loopy--parse-set-command ((&whole cmd _ var &rest vals))
(cl-defun loopy--parse-set-command ((_ var &rest vals))
"Parse the `set' command.
- VAR is the variable to assign.
Expand Down Expand Up @@ -190,7 +190,7 @@ handled by `loopy-iter'."
;; being known at compile time (but still only being evaluated once.)
;; (#194)
(cl-defun loopy--parse-set-prev-command
((&whole cmd _ var val &key back))
((_ var val &key back))
"Parse the `set-prev' command as (set-prev VAR VAL &key back).
VAR is set to a version of VAL in a past loop cycle. With BACK,
Expand Down Expand Up @@ -1777,7 +1777,7 @@ you can use in the instructions:
args (nreverse args-holding))
(setq args parser-args)))

(ignore args opts)
(ignore name args opts)

(let ((arg-length (length args)))
(cond
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57 changes: 34 additions & 23 deletions loopy-destructure.el
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Original file line number Diff line number Diff line change
Expand Up @@ -384,6 +384,15 @@ Type is one of `list' or `array'."

;;;; Pcase pattern

(defun loopy--pcase-flip (fn arg2)
"Wrapper macro for compatibility with obsoletion of `pcase--flip'.
FN is the function. ARG2 is the argument to move to the second
postion of the call to FN in the pattern."
(static-if (>= emacs-major-version 30)
`(,fn _ ,arg2)
`(pcase--flip ,fn ,arg2)))

(defun loopy--get-var-pattern (var)
"Get the correct variable pattern.
Expand All @@ -397,7 +406,7 @@ return `(loopy VAR)'. In all other cases, VAR is returned."

;; TODO: Use this in `list' pattern.
(defun loopy--pcase-let-nil-list (pat)
"Return a list of patterns binding variables in PAT to `nil'."
"Return a list of patterns binding variables in PAT to nil."
;; Need to quote `nil' for it to be a `pcase' pattern.
(pcase pat
(`(loopy ,(and (pred seqp) seq))
Expand All @@ -422,7 +431,7 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
(cdr pos-vars) opt-vars
rest-var map-or-key-vars))))
(opt-vars (loopy--pcase-let-workaround (var default supplied)
(pcase-let* ((`(,var ,default ,supplied ,length)
(pcase-let* ((`(,var ,default ,supplied ,_length)
(loopy--get-&optional-spec (car opt-vars)))
(var2 (loopy--get-var-pattern var)))
`(and (pred listp)
Expand Down Expand Up @@ -457,10 +466,10 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
(opt-len (length opt-vars)))
;; We allow the variable form to be shorter than the
;; destructured sequence.
`(and (pred (pcase--flip ,(compat-function length>) ,(1- pos-len)))
`(and (pred ,(loopy--pcase-flip (compat-function length>) (1- pos-len)))
,@(cl-loop for var in pos-vars
for idx from 0
collect `(app (pcase--flip aref ,idx)
collect `(app ,(loopy--pcase-flip 'aref idx)
,(loopy--get-var-pattern var)))
,@(when opt-vars
(let ((opt-var-specs (seq-into (mapcar #'loopy--get-&optional-spec
Expand All @@ -477,8 +486,8 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
;; the one variable was not supplied and we
;; need to check the remaining ones.
`(and ,(if use->=
`(pred (pcase--flip ,(compat-function length>) ,(1- checked-len)))
`(pred (pcase--flip ,(compat-function length=) ,checked-len)))
`(pred ,(loopy--pcase-flip (compat-function length>) (1- checked-len)))
`(pred ,(loopy--pcase-flip (compat-function length=) checked-len)))
;; Variables that should be bound with the value in
;; the array.
,@(cl-loop
Expand All @@ -488,10 +497,10 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
(aref opt-var-specs spec-idx2))
(var3 (loopy--get-var-pattern var2)))
(if (= len2 3)
`((app (pcase--flip aref ,arr-idx)
`((app ,(loopy--pcase-flip 'aref arr-idx)
,var3)
(let ,supplied2 t))
`((app (pcase--flip aref ,arr-idx)
`((app ,(loopy--pcase-flip 'aref arr-idx)
,var3)))))
;; Variables that should be bound to nil or their
;; default.
Expand Down Expand Up @@ -529,18 +538,20 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
(rest-pat (loopy--get-var-pattern rest-var))
(seqsym (gensym "seqsym")))
;; Rec-checking the length is fast for arrays.
`((or (and (pred (pcase--flip ,(compat-function length>) ,len-sum))
(app (pcase--flip substring ,len-sum) ; 0-indexed
`((or (and (pred ,(loopy--pcase-flip (compat-function length>) len-sum))
(app ,(loopy--pcase-flip 'substring len-sum) ; 0-indexed
,rest-pat))
(app (lambda (,seqsym) (substring ,seqsym 0 0))
,rest-pat))))))))

(defun loopy--seq-length= (seq n)
"Check whether the length of SEQ is equal to N."
(if (sequencep seq)
(compat-call length= seq n)
(= (seq-length seq) n)))

(defun loopy--seq-length> (seq n)
"Check whether the length of SEQ is greater than to N."
(cond
((sequencep seq)
(compat-call length> seq n))
Expand All @@ -567,14 +578,14 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
(cl-labels ((make-pos-pats ()
(cl-loop for v in pos-vars
for i from 0
collect `(app (pcase--flip seq-elt ,i)
collect `(app ,(loopy--pcase-flip 'seq-elt i)
,(loopy--get-var-pattern v)))))
`(and
;; If there are optional values, then we can avoid the length check here
;; by running the length check for the optional values, which we need to
;; do anyway.
,@(when (null opt-vars)
`((pred (pcase--flip loopy--seq-length> ,(1- pos-len)))
`((pred ,(loopy--pcase-flip 'loopy--seq-length> (1- pos-len)))
,@(make-pos-pats)))
;; Optional variables may or may not be expensive for generic
;; sequences. This is the same logic as for arrays, just using the
Expand All @@ -595,8 +606,8 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
;; the one variable was not supplied and we
;; need to check the remaining ones.
`(and ,(if use->=
`(pred (pcase--flip loopy--seq-length> ,(1- checked-len)))
`(pred (pcase--flip loopy--seq-length= ,checked-len)))
`(pred ,(loopy--pcase-flip 'loopy--seq-length> (1- checked-len)))
`(pred ,(loopy--pcase-flip 'loopy--seq-length= checked-len)))
,@(when pos-vars
(make-pos-pats))
;; Variables that should be bound with the value in
Expand All @@ -607,10 +618,10 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
append (pcase-let* ((`(,var2 ,_ ,supplied2) (aref opt-var-specs spec-idx2))
(var3 (loopy--get-var-pattern var2)))
(if supplied2
`((app (pcase--flip seq-elt ,arr-idx)
`((app ,(loopy--pcase-flip 'seq-elt arr-idx)
,var3)
(let ,supplied2 t))
`((app (pcase--flip seq-elt ,arr-idx)
`((app ,(loopy--pcase-flip 'seq-elt arr-idx)
,var3)))))
;; Variables that should be bound to nil or their
;; default.
Expand All @@ -630,7 +641,7 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
))))))
;; A pattern for when nothing matches.
(and ,@(cl-loop for spec across opt-var-specs
append (pcase-let* ((`(,var2 ,default2 ,supplied2 ,len2) spec)
append (pcase-let* ((`(,var2 ,default2 ,supplied2 ,_len2) spec)
(var3 (loopy--get-var-pattern var2)))
`(,@(when supplied2
`((let ,supplied2 nil)))
Expand All @@ -643,10 +654,10 @@ MAP-OR-KEY-VARS is whether there are map or key variables."
;; `((let ,var3 ,default2))))
)))
,@(when pos-vars
`((pred (pcase--flip loopy--seq-length> ,(1- pos-len)))
`((pred ,(loopy--pcase-flip 'loopy--seq-length> (1- pos-len)))
,@(make-pos-pats))))))))
,@(when rest-var
`((app (pcase--flip seq-drop ,(+ pos-len opt-len))
`((app ,(loopy--pcase-flip 'seq-drop (+ pos-len opt-len))
,(loopy--get-var-pattern rest-var))))))))

(defun loopy--pcase-pat-&key-pattern (key-vars allow-other-keys)
Expand Down Expand Up @@ -684,7 +695,7 @@ holding the property list."
,default)))
,var))
(t
`(app (pcase--flip plist-get ,key)
`(app ,(loopy--pcase-flip 'plist-get key)
,var)))))
key-vars))
;; If we are checking whether there are no other keys in EXPVAL,
Expand Down Expand Up @@ -770,7 +781,7 @@ holding the property list."
`(app (lambda (,mapsym) (map-elt ,mapsym ,key ,default))
,var))
(t
`(app (pcase--flip map-elt ,key) ,var))))))
`(app ,(loopy--pcase-flip 'map-elt key) ,var))))))
map-vars))))

(defun loopy--pcase-pat-&aux-pattern (aux-vars)
Expand Down Expand Up @@ -858,8 +869,8 @@ See the Info node `(loopy)Basic Destructuring'."
`(app (lambda (_) ,rest-var)
,(loopy--pcase-pat-&map-pattern map-vars)))
((or pos-vars opt-vars)
`(app (pcase--flip seq-drop ,(+ (length pos-vars)
(length opt-vars)))
`(app ,(loopy--pcase-flip 'seq-drop (+ (length pos-vars)
(length opt-vars)))
,(loopy--pcase-pat-&map-pattern map-vars)))
(t
(loopy--pcase-pat-&map-pattern map-vars))))
Expand Down

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