lib/keyword.c (kw_parseempty): Use correct variable scanning `kwval' list.

[sod] / src / utilities.lisp

diff --git a/src/utilities.lisp b/src/utilities.lisp
index 1670f55..9ff9daf 100644 (file)
--- a/src/utilities.lisp
+++ b/src/utilities.lisp
@@ -210,8 +210,10 @@
 ;;;--------------------------------------------------------------------------
 ;;; Locatives.
 
-(export '(loc locp))
-(defstruct (loc (:predicate locp) (:constructor make-loc (reader writer)))
+(export '(locative locativep))
+(defstruct (locative (:predicate locativep)
+                    (:constructor make-locative (reader writer))
+                    (:conc-name loc-))
   "Locative data type.  See `locf' and `ref'."
   (reader nil :type function)
   (writer nil :type function))
@@ -228,8 +230,8 @@
       (valtmps valforms newtmps setform getform)
       (get-setf-expansion place env)
     `(let* (,@(mapcar #'list valtmps valforms))
-       (make-loc (lambda () ,getform)
-                (lambda (,@newtmps) ,setform)))))
+       (make-locative (lambda () ,getform)
+                     (lambda (,@newtmps) ,setform)))))
 
 (export 'ref)
 (declaim (inline ref (setf ref)))
@@ -402,6 +404,17 @@
    except where overridden by INITARGS."
   (apply #'copy-instance-using-class (class-of object) object initargs))
 
+(export 'find-eql-specialized-method)
+(defun find-eql-specialized-method (function arg object)
+  "Return a method defined on FUNCTION whose ARGth argument is
+   `eql'-specialized on OBJECT."
+  (find-if (lambda (method)
+            (let ((spec (nth arg (method-specializers method))))
+              (and spec
+                   (typep spec 'eql-specializer)
+                   (eq (eql-specializer-object spec) object))))
+          (generic-function-methods function)))
+
 (export '(generic-function-methods method-specializers
          eql-specializer eql-specializer-object))
 
@@ -451,6 +464,25 @@
    and return the result of appending all of the resulting lists."
   (reduce #'append (apply #'mapcar function list more-lists) :from-end t))
 
+(export 'cross-product)
+(defun cross-product (&rest pieces)
+  "Return the cross product of the PIECES.
+
+   Each arguments may be a list, or a (non-nil) atom, which is equivalent to
+   a singleton list containing just that atom.  Return a list of all possible
+   lists which can be constructed by taking one item from each argument list
+   in turn, in an arbitrary order."
+  (reduce (lambda (piece tails)
+           (mapcan (lambda (tail)
+                     (mapcar (lambda (head)
+                               (cons head tail))
+                             (if (listp piece) piece
+                                 (list piece))))
+                   tails))
+         pieces
+         :from-end t
+         :initial-value '(nil)))
+
 (export 'distinguished-point-shortest-paths)
 (defun distinguished-point-shortest-paths (root neighbours-func)
   "Moderately efficient shortest-paths-from-root computation.