From fa52edd4c4eb9e2d8ae2e43821460cfd594593b5 Mon Sep 17 00:00:00 2001
From: Nicolas Petton <nicolas@petton.fr>
Date: Sun, 21 Jun 2015 23:44:50 +0200
Subject: [PATCH] Revert "Define `map-elt' as a generalized variable"

This reverts commit 8b6d82d3ca86f76ed964063b3941a7c6ab0bf1c6.
---
 lisp/emacs-lisp/map.el      | 52 +++++++++++++++++--------------------
 test/automated/map-tests.el | 24 ++++++++---------
 2 files changed, 36 insertions(+), 40 deletions(-)

diff --git a/lisp/emacs-lisp/map.el b/lisp/emacs-lisp/map.el
index 8759616053a..1d8a3126bba 100644
--- a/lisp/emacs-lisp/map.el
+++ b/lisp/emacs-lisp/map.el
@@ -82,21 +82,25 @@ The following keyword types are meaningful: `:list',
 
 An error is thrown if MAP is neither a list, hash-table nor array.
 
-Return RESULT if non-nil or the result of evaluation of the form.
+Return RESULT if non-nil or the result of evaluation of the
+form.
 
 \(fn (VAR MAP [RESULT]) &rest ARGS)"
   (declare (debug t) (indent 1))
   (unless (listp spec)
     (setq spec `(,spec ,spec)))
-  (let ((map-var (car spec)))
-    `(let* ,(unless (eq map-var (cadr spec)) `((,map-var ,(cadr spec))))
-       (cond ((listp ,map-var) ,(plist-get args :list))
-             ((hash-table-p ,map-var) ,(plist-get args :hash-table))
-             ((arrayp ,map-var) ,(plist-get args :array))
-             (t (error "Unsupported map: %s" ,map-var)))
-       ,@(cddr spec))))
-
-(put 'map--raw-place 'gv-expander #'funcall)
+  (let ((map-var (car spec))
+        (result-var (make-symbol "result")))
+    `(let ((,map-var ,(cadr spec))
+           ,result-var)
+       (setq ,result-var
+             (cond ((listp ,map-var) ,(plist-get args :list))
+                   ((hash-table-p ,map-var) ,(plist-get args :hash-table))
+                   ((arrayp ,map-var) ,(plist-get args :array))
+                   (t (error "Unsupported map: %s" ,map-var))))
+       ,@(when (cddr spec)
+           `((setq ,result-var ,@(cddr spec))))
+       ,result-var)))
 
 (defun map-elt (map key &optional default)
   "Perform a lookup in MAP of KEY and return its associated value.
@@ -105,34 +109,26 @@ If KEY is not found, return DEFAULT which defaults to nil.
 If MAP is a list, `eql' is used to lookup KEY.
 
 MAP can be a list, hash-table or array."
-  (declare
-   (gv-expander
-    (lambda (do)
-      (gv-letplace (mgetter msetter) map
-        (macroexp-let2* nil
-            ;; Eval them once and for all in the right order.
-            ((key key) (default default))
-          `(map--dispatch ,mgetter
-             :list ,(gv-get `(alist-get ,key (map--raw-place ,mgetter ,msetter)
-                                        ,default)
-                            do)
-             :hash-table ,(gv-get `(gethash ,key (map--raw-place ,mgetter ,msetter)
-                                            ,default))
-             :array ,(gv-get (aref (map--raw-place ,mgetter ,msetter) ,key)
-                             do)))))))
   (map--dispatch map
     :list (alist-get key map default)
     :hash-table (gethash key map default)
     :array (map--elt-array map key default)))
 
-(defun map-put (map key value)
+(defmacro map-put (map key value)
   "In MAP, associate KEY with VALUE and return MAP.
 If KEY is already present in MAP, replace the associated value
 with VALUE.
 
 MAP can be a list, hash-table or array."
-  (setf (map-elt map key) value)
-  map)
+  (declare (debug t))
+  (let ((symbol (symbolp map)))
+    `(progn
+       (map--dispatch (m ,map m)
+         :list (if ,symbol
+                   (setq ,map (cons (cons ,key ,value) m))
+                 (error "Literal lists are not allowed, %s must be a symbol" ',map))
+         :hash-table (puthash ,key ,value m)
+         :array (aset m ,key ,value)))))
 
 (defmacro map-delete (map key)
   "In MAP, delete the key KEY if present and return MAP.
diff --git a/test/automated/map-tests.el b/test/automated/map-tests.el
index 402fead88f7..abda03d9d04 100644
--- a/test/automated/map-tests.el
+++ b/test/automated/map-tests.el
@@ -40,11 +40,11 @@ Evaluate BODY for each created map.
   (let ((alist (make-symbol "alist"))
         (vec (make-symbol "vec"))
         (ht (make-symbol "ht")))
-    `(let ((,alist (list (cons 0  3)
-                         (cons 1  4)
-                         (cons 2  5)))
-           (,vec (make-vector 3 nil))
-           (,ht (make-hash-table)))
+   `(let ((,alist '((0 . 3)
+                    (1 . 4)
+                    (2 . 5)))
+          (,vec (make-vector 3 nil))
+          (,ht (make-hash-table)))
       (aset ,vec 0 '3)
       (aset ,vec 1 '4)
       (aset ,vec 2 '5)
@@ -87,13 +87,13 @@ Evaluate BODY for each created map.
   (let ((vec [3 4 5]))
    (should-error (map-put vec 3 6))))
 
-;; (ert-deftest test-map-put-literal ()
-;;   (should (= (map-elt (map-put [1 2 3] 1 4) 1)
-;;              4))
-;;   (should (= (map-elt (map-put (make-hash-table) 'a 2) 'a)
-;;              2))
-;;   (should-error (map-put '((a . 1)) 'b 2))
-;;   (should-error (map-put '() 'a 1)))
+(ert-deftest test-map-put-literal ()
+  (should (= (map-elt (map-put [1 2 3] 1 4) 1)
+             4))
+  (should (= (map-elt (map-put (make-hash-table) 'a 2) 'a)
+             2))
+  (should-error (map-put '((a . 1)) 'b 2))
+  (should-error (map-put '() 'a 1)))
 
 (ert-deftest test-map-put-return-value ()
   (let ((ht (make-hash-table)))
-- 
2.39.2