From: dick.r.chiang@gmail.com
To: 29799@debbugs.gnu.org
Subject: bug#29799: 24.5; cl-loop guard clause missing
Date: Sun, 27 Oct 2019 23:59:41 -0400 [thread overview]
Message-ID: <87a79lseoi.fsf@dick> (raw)
In-Reply-To: <87d138beur.fsf@gmail.com> (Tino Calancha's message of "Thu, 21 Dec 2017 18:38:20 +0900")
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I noticed the following cases stopped working after commit a036543.
;; should not fail
(cl-loop for i from 1 upto 100 and j = 1 then (1+ j)
do (cl-assert (= i j) t)
until (> j 10))
;; should return (1 0)
(cl-loop with result
for x below 3
for y below 2
and z = (progn (push x result) nil)
finally return result)
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From c193f58b91ce875de4b8d4d4a87fbaea8111fdf5 Mon Sep 17 00:00:00 2001
From: dickmao <none>
Date: Sun, 27 Oct 2019 16:11:48 -0400
Subject: [PATCH] Refix conditional step clauses in cl-loop
Readdress (bug#29799), and add more tests.
* lisp/emacs-lisp/cl-macs.el (cl--loop-bindings, cl-loop):
Add cl--loop-conditions, remove cl--loop-guard-cond
(cl--push-clause-loop-body, cl--parse-loop-clause):
New convenience macro for tracking cl--loop-conditions (bug#29799)
---
lisp/emacs-lisp/cl-macs.el | 96 +++++++++++----------------
test/lisp/emacs-lisp/cl-macs-tests.el | 77 +++++++++++++++++++--
2 files changed, 110 insertions(+), 63 deletions(-)
diff --git a/lisp/emacs-lisp/cl-macs.el b/lisp/emacs-lisp/cl-macs.el
index 80e218884a..a5ecf33203 100644
--- a/lisp/emacs-lisp/cl-macs.el
+++ b/lisp/emacs-lisp/cl-macs.el
@@ -889,7 +889,7 @@ cl-return-from
;;; The "cl-loop" macro.
(defvar cl--loop-args) (defvar cl--loop-accum-var) (defvar cl--loop-accum-vars)
-(defvar cl--loop-bindings) (defvar cl--loop-body)
+(defvar cl--loop-bindings) (defvar cl--loop-body) (defvar cl--loop-conditions)
(defvar cl--loop-finally)
(defvar cl--loop-finish-flag) ;Symbol set to nil to exit the loop?
(defvar cl--loop-first-flag)
@@ -897,7 +897,7 @@ cl--loop-initially
(defvar cl--loop-name)
(defvar cl--loop-result) (defvar cl--loop-result-explicit)
(defvar cl--loop-result-var) (defvar cl--loop-steps)
-(defvar cl--loop-symbol-macs) (defvar cl--loop-guard-cond)
+(defvar cl--loop-symbol-macs)
(defun cl--loop-set-iterator-function (kind iterator)
(if cl--loop-iterator-function
@@ -966,7 +966,8 @@ cl-loop
(cl--loop-accum-var nil) (cl--loop-accum-vars nil)
(cl--loop-initially nil) (cl--loop-finally nil)
(cl--loop-iterator-function nil) (cl--loop-first-flag nil)
- (cl--loop-symbol-macs nil) (cl--loop-guard-cond nil))
+ (cl--loop-symbol-macs nil)
+ (cl--loop-conditions nil))
;; Here is more or less how those dynbind vars are used after looping
;; over cl--parse-loop-clause:
;;
@@ -1001,24 +1002,7 @@ cl-loop
(list (or cl--loop-result-explicit
cl--loop-result))))
(ands (cl--loop-build-ands (nreverse cl--loop-body)))
- (while-body
- (nconc
- (cadr ands)
- (if (or (not cl--loop-guard-cond) (not cl--loop-first-flag))
- (nreverse cl--loop-steps)
- ;; Right after update the loop variable ensure that the loop
- ;; condition, i.e. (car ands), is still satisfied; otherwise,
- ;; set `cl--loop-first-flag' nil and skip the remaining
- ;; body forms (#Bug#29799).
- ;;
- ;; (last cl--loop-steps) updates the loop var
- ;; (car (butlast cl--loop-steps)) sets `cl--loop-first-flag' nil
- ;; (nreverse (cdr (butlast cl--loop-steps))) are the
- ;; remaining body forms.
- (append (last cl--loop-steps)
- `((and ,(car ands)
- ,@(nreverse (cdr (butlast cl--loop-steps)))))
- `(,(car (butlast cl--loop-steps)))))))
+ (while-body (nconc (cadr ands) (nreverse cl--loop-steps)))
(body (append
(nreverse cl--loop-initially)
(list (if cl--loop-iterator-function
@@ -1051,6 +1035,12 @@ cl-loop
(list `(cl-symbol-macrolet ,cl--loop-symbol-macs ,@body))))
`(cl-block ,cl--loop-name ,@body)))))
+(defmacro cl--push-clause-loop-body (clause)
+ "Apply CLAUSE to both `cl--loop-conditions' and `cl--loop-body'."
+ `(progn
+ (push ,clause cl--loop-conditions)
+ (push ,clause cl--loop-body)))
+
;; Below is a complete spec for cl-loop, in several parts that correspond
;; to the syntax given in CLtL2. The specs do more than specify where
;; the forms are; it also specifies, as much as Edebug allows, all the
@@ -1201,8 +1191,6 @@ cl-loop
;; (def-edebug-spec loop-d-type-spec
;; (&or (loop-d-type-spec . [&or nil loop-d-type-spec]) cl-type-spec))
-
-
(defun cl--parse-loop-clause () ; uses loop-*
(let ((word (pop cl--loop-args))
(hash-types '(hash-key hash-keys hash-value hash-values))
@@ -1281,11 +1269,11 @@ cl--parse-loop-clause
(if end-var (push (list end-var end) loop-for-bindings))
(if step-var (push (list step-var step)
loop-for-bindings))
- (if end
- (push (list
- (if down (if excl '> '>=) (if excl '< '<=))
- var (or end-var end))
- cl--loop-body))
+ (when end
+ (cl--push-clause-loop-body
+ (list
+ (if down (if excl '> '>=) (if excl '< '<=))
+ var (or end-var end))))
(push (list var (list (if down '- '+) var
(or step-var step 1)))
loop-for-steps)))
@@ -1295,7 +1283,7 @@ cl--parse-loop-clause
(temp (if (and on (symbolp var))
var (make-symbol "--cl-var--"))))
(push (list temp (pop cl--loop-args)) loop-for-bindings)
- (push `(consp ,temp) cl--loop-body)
+ (cl--push-clause-loop-body `(consp ,temp))
(if (eq word 'in-ref)
(push (list var `(car ,temp)) cl--loop-symbol-macs)
(or (eq temp var)
@@ -1318,24 +1306,19 @@ cl--parse-loop-clause
((eq word '=)
(let* ((start (pop cl--loop-args))
(then (if (eq (car cl--loop-args) 'then)
- (cl--pop2 cl--loop-args) start)))
+ (cl--pop2 cl--loop-args) start))
+ (first-assign (or cl--loop-first-flag
+ (setq cl--loop-first-flag
+ (make-symbol "--cl-var--")))))
(push (list var nil) loop-for-bindings)
(if (or ands (eq (car cl--loop-args) 'and))
(progn
- (push `(,var
- (if ,(or cl--loop-first-flag
- (setq cl--loop-first-flag
- (make-symbol "--cl-var--")))
- ,start ,var))
- loop-for-sets)
- (push (list var then) loop-for-steps))
- (push (list var
- (if (eq start then) start
- `(if ,(or cl--loop-first-flag
- (setq cl--loop-first-flag
- (make-symbol "--cl-var--")))
- ,start ,then)))
- loop-for-sets))))
+ (push `(,var (if ,first-assign ,start ,var)) loop-for-sets)
+ (push `(,var (if ,(car (cl--loop-build-ands
+ (nreverse cl--loop-conditions)))
+ ,then ,var))
+ loop-for-steps))
+ (push `(,var (if ,first-assign ,start ,then)) loop-for-sets))))
((memq word '(across across-ref))
(let ((temp-vec (make-symbol "--cl-vec--"))
@@ -1344,9 +1327,8 @@ cl--parse-loop-clause
(push (list temp-vec (pop cl--loop-args)) loop-for-bindings)
(push (list temp-len `(length ,temp-vec)) loop-for-bindings)
(push (list temp-idx -1) loop-for-bindings)
- (push `(< (setq ,temp-idx (1+ ,temp-idx))
- ,temp-len)
- cl--loop-body)
+ (cl--push-clause-loop-body
+ `(< (setq ,temp-idx (1+ ,temp-idx)) ,temp-len))
(if (eq word 'across-ref)
(push (list var `(aref ,temp-vec ,temp-idx))
cl--loop-symbol-macs)
@@ -1376,15 +1358,14 @@ cl--parse-loop-clause
loop-for-bindings)
(push (list var `(elt ,temp-seq ,temp-idx))
cl--loop-symbol-macs)
- (push `(< ,temp-idx ,temp-len) cl--loop-body))
+ (cl--push-clause-loop-body `(< ,temp-idx ,temp-len)))
;; Evaluate seq length just if needed, that is, when seq is not a cons.
(push (list temp-len (or (consp seq) `(length ,temp-seq)))
loop-for-bindings)
(push (list var nil) loop-for-bindings)
- (push `(and ,temp-seq
- (or (consp ,temp-seq)
- (< ,temp-idx ,temp-len)))
- cl--loop-body)
+ (cl--push-clause-loop-body `(and ,temp-seq
+ (or (consp ,temp-seq)
+ (< ,temp-idx ,temp-len))))
(push (list var `(if (consp ,temp-seq)
(pop ,temp-seq)
(aref ,temp-seq ,temp-idx)))
@@ -1480,9 +1461,8 @@ cl--parse-loop-clause
(push (list var '(selected-frame))
loop-for-bindings)
(push (list temp nil) loop-for-bindings)
- (push `(prog1 (not (eq ,var ,temp))
- (or ,temp (setq ,temp ,var)))
- cl--loop-body)
+ (cl--push-clause-loop-body `(prog1 (not (eq ,var ,temp))
+ (or ,temp (setq ,temp ,var))))
(push (list var `(next-frame ,var))
loop-for-steps)))
@@ -1503,9 +1483,8 @@ cl--parse-loop-clause
(push (list minip `(minibufferp (window-buffer ,var)))
loop-for-bindings)
(push (list temp nil) loop-for-bindings)
- (push `(prog1 (not (eq ,var ,temp))
- (or ,temp (setq ,temp ,var)))
- cl--loop-body)
+ (cl--push-clause-loop-body `(prog1 (not (eq ,var ,temp))
+ (or ,temp (setq ,temp ,var))))
(push (list var `(next-window ,var ,minip))
loop-for-steps)))
@@ -1529,7 +1508,6 @@ cl--parse-loop-clause
t)
cl--loop-body))
(when loop-for-steps
- (setq cl--loop-guard-cond t)
(push (cons (if ands 'cl-psetq 'setq)
(apply 'append (nreverse loop-for-steps)))
cl--loop-steps))))
diff --git a/test/lisp/emacs-lisp/cl-macs-tests.el b/test/lisp/emacs-lisp/cl-macs-tests.el
index 09ce660a2f..8beb9d317b 100644
--- a/test/lisp/emacs-lisp/cl-macs-tests.el
+++ b/test/lisp/emacs-lisp/cl-macs-tests.el
@@ -30,7 +30,7 @@
;;; ANSI 6.1.1.7 Destructuring
(ert-deftest cl-macs-loop-and-assignment ()
- ;; Bug#6583
+ "Bug#6583"
:expected-result :failed
(should (equal (cl-loop for numlist in '((1 2 4.0) (5 6 8.3) (8 9 10.4))
for a = (cl-first numlist)
@@ -61,7 +61,6 @@
;;; 6.1.2.1.1 The for-as-arithmetic subclause
(ert-deftest cl-macs-loop-for-as-arith ()
"Test various for-as-arithmetic subclauses."
- :expected-result :failed
(should (equal (cl-loop for i to 10 by 3 collect i)
'(0 3 6 9)))
(should (equal (cl-loop for i upto 3 collect i)
@@ -74,9 +73,9 @@
'(10 8 6)))
(should (equal (cl-loop for i from 10 downto 1 by 3 collect i)
'(10 7 4 1)))
- (should (equal (cl-loop for i above 0 by 2 downfrom 10 collect i)
+ (should (equal (cl-loop for i downfrom 10 above 0 by 2 collect i)
'(10 8 6 4 2)))
- (should (equal (cl-loop for i downto 10 from 15 collect i)
+ (should (equal (cl-loop for i from 15 downto 10 collect i)
'(15 14 13 12 11 10))))
(ert-deftest cl-macs-loop-for-as-arith-order-side-effects ()
@@ -530,4 +529,74 @@
l)
'(1))))
+(ert-deftest cl-macs-loop-conditional-step-clauses ()
+ "These tests failed under the initial fixes in #bug#29799."
+ (should (cl-loop for i from 1 upto 100 and j = 1 then (1+ j)
+ if (not (= i j))
+ return nil
+ end
+ until (> j 10)
+ finally return t))
+
+ (should (equal (let* ((size 7)
+ (arr (make-vector size 0)))
+ (cl-loop for k below size
+ for x = (* 2 k) and y = (1+ (elt arr k))
+ collect (list k x y)))
+ '((0 0 1) (1 2 1) (2 4 1) (3 6 1) (4 8 1) (5 10 1) (6 12 1))))
+ (should (equal (cl-loop with result
+ for x below 3
+ for y below 2 and z = 1
+ collect x)
+ '(0 1)))
+
+ (should (equal (cl-loop with result
+ for x below 3
+ and y below 2
+ collect x)
+ '(0 1)))
+
+ ;; this is actually disallowed in clisp, but is semantically consistent
+ (should (equal (cl-loop with result
+ for x below 3
+ for y = (progn (push x result) x) and z = 1
+ append (list x y) into result
+ finally return result)
+ '(2 1 0 0 0 1 1 2 2)))
+
+ ;; this is actually disallowed in clisp, but is semantically consistent
+ (should (equal (cl-loop with result
+ for x below 3
+ and y = (progn (push x result) x) and z = 1
+ append (list x y) into result
+ finally return result)
+ '(2 1 0 0 0 0 1 0 2 1)))
+
+ (should (equal (cl-loop with result
+ for x below 3
+ for y = (progn (push x result))
+ finally return result)
+ '(2 1 0)))
+
+ ;; this nonintuitive result is replicated by clisp
+ (should (equal (cl-loop with result
+ for x below 3
+ and y = (progn (push x result))
+ finally return result)
+ '(2 1 0 0)))
+
+ ;; this nonintuitive result is replicated by clisp
+ (should (equal (cl-loop with result
+ for x below 3
+ and y = (progn (push x result)) then (progn (push (1+ x) result))
+ finally return result)
+ '(3 2 1 0)))
+
+ (should (cl-loop with result
+ for x below 3
+ for y = (progn (push x result) x) then (progn (push (1+ x) result) (1+ x))
+ and z = 1
+ collect y into result1
+ finally return (equal (nreverse result) result1))))
+
;;; cl-macs-tests.el ends here
--
2.23.0
next prev parent reply other threads:[~2019-10-28 3:59 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-21 9:38 bug#29799: 24.5; cl-loop guard clause missing Tino Calancha
2018-01-01 21:46 ` Noam Postavsky
2018-01-01 22:58 ` Noam Postavsky
2018-01-03 10:34 ` Tino Calancha
2018-01-06 13:43 ` Noam Postavsky
2018-01-08 10:20 ` Tino Calancha
2019-10-28 3:59 ` dick.r.chiang [this message]
2019-11-21 23:25 ` dick.r.chiang
2019-11-22 12:55 ` Lars Ingebrigtsen
2019-11-22 13:51 ` dick.r.chiang
2019-11-22 14:53 ` Lars Ingebrigtsen
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