Version 6.4.1

[clsql.git] / sql / utils.lisp

diff --git a/sql/utils.lisp b/sql/utils.lisp
index e498f16888e52b07d56ddc80ce65195fe7907f75..a215a446ed31cc903584ffc37cf1b18f275ad073 100644 (file)
--- a/sql/utils.lisp
+++ b/sql/utils.lisp
@@ -16,6 +16,22 @@
 
 (in-package #:clsql-sys)
 
+(defmacro defaulting (&rest place-value-plist)
+  "for places and values (as an &rest plist)
+   if place-n is null set it to value-n"
+  `(progn
+    ,@(loop for (place value . rest) on place-value-plist by #'cddr
+            collect `(unless ,place (setf ,place ,value)))))
+
+(defmacro pop-n (place &optional (n 1))
+  "pops n items off of a list in place and returns their values in a new list
+
+   if n > the length of the list in place, then we return the full list,
+     setting the place to nil"
+  `(loop repeat ,n
+    while ,place
+    collect (pop ,place)))
+
 (defun %get-int (v)
   (etypecase v
     (string (parse-integer v :junk-allowed t))
@@ -392,7 +408,7 @@ list of characters and replacement strings."
   (setq cl:*features* (delete :clsql-lowercase-reader cl:*features*)))
 
 (defun replace-all (string part replacement &key (test #'char=) stream)
-  "Returns a new string in which all the occurences of the part 
+  "Returns a new string in which all the occurences of the part
 is replaced with replacement. [FROM http://cl-cookbook.sourceforge.net/strings.html#manip]"
   (let ((out (or stream (make-string-output-stream))))
     (loop with part-length = (length part)
@@ -427,7 +443,7 @@ removed. keys are searched with #'MEMBER"
     ;;clearing mechanism. If you are on an implementation that doesn't support
     ;;weak hash tables then you're memory may accumulate.
 
-    #-(or sbcl allegro clisp lispworks)
+    #-(or sbcl allegro clisp lispworks ccl)
     (warn "UNSAFE! use of weak hash on implementation without support. (see clsql/sql/utils.lisp to add)")
 
     (make-hash-table
@@ -435,5 +451,41 @@ removed. keys are searched with #'MEMBER"
       #+clisp     :weak      #+clisp :value
       #+lispworks :weak-kind #+lispworks :value
       #+sbcl :weakness #+sbcl :value
+      #+ccl :weak #+ccl :value
       ,@args)
     ))
+
+(defun to-slot-name (slot)
+  "try to turn what we got representing the slot into a slot name"
+  (etypecase slot
+    (symbol slot)
+    (slot-definition (slot-definition-name slot))))
+
+(defun to-class (it)
+  (etypecase it
+    (class it)
+    (symbol (find-class it))
+    (standard-object (class-of it))))
+
+(defun to-class-name (o)
+  (etypecase o
+    (symbol o)
+    (standard-class (class-name o))
+    (standard-object (class-name (class-of o)))))
+
+(defun easy-slot-value (obj slot)
+  "like slot-value except it accepts slot-names or defs
+   and returns nil when the slot is unbound"
+  (let ((n (to-slot-name slot)))
+    (when (and obj (slot-boundp obj n))
+      (slot-value obj n))))
+
+(defun (setf easy-slot-value) (new obj slot)
+  "like slot-value except it accepts slot-names or defs"
+  (setf (slot-value obj (to-slot-name slot)) new))
+
+(defun delist-if-single (x)
+  "if this is a single item in a list return it"
+  (if (and (listp x) (= 1 (length x)))
+      (first x)
+      x))