;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Mar 2002
;;;;
-;;;; $Id$
-;;;;
-;;;; This file, part of CLSQL, is Copyright (c) 2002-2004 by Kevin M. Rosenberg
+;;;; This file, part of CLSQL, is Copyright (c) 2002-2010 by Kevin M. Rosenberg
;;;;
;;;; CLSQL users are granted the rights to distribute and use this software
;;;; as governed by the terms of the Lisp Lesser GNU Public License
(in-package #:clsql-sys)
+(defun %get-int (v)
+ (etypecase v
+ (string (parse-integer v :junk-allowed t))
+ (integer v)
+ (number (truncate v))))
+
+(defvar +whitespace-chars+
+ '(#\space #\tab #\newline #\return
+ ;; Tested: sbcl unicode, allegrocl, openmcl,clisp use #\no-break_space
+ ;; lispworks uses #\no-break-space
+ ;; sbcl non-unicode doesn't support no break space
+ ;; AllegroCL 8-bit strings don't fail on reading #\no-break_space,
+ ;; but can't represent such a character
+ ;; CMUCL errors when trying to read #\no-break_space
+ #+(and lispworks unicode) #\no-break-space
+ #+(or (and sbcl sb-unicode) (and allegro ics) (and clisp i18n)
+ (and openmcl openmcl-unicode-strings))
+ #\no-break_space
+ )
+ "List of whitespace characters for this lisp implementation.")
+
(defun number-to-sql-string (num)
(etypecase num
(integer
(defun float-to-sql-string (num)
"Convert exponent character for SQL"
(let ((str (write-to-string num :readably t)))
+ (declare (type string str))
(cond
((find #\f str)
(substitute #\e #\f str))
(string identifier))))
(substitute #\_ #\- unescaped)))
+#+lispworks
+(defvar +lw-has-without-preemption+
+ #+lispworks6 nil
+ #-lispworks6 t)
+#+lispworks
+(defvar +lw-global-lock+
+ (unless +lw-has-without-preemption+
+ (mp:make-lock :name "CLSQL" :important-p nil :safep t :recursivep nil
+ :sharing t)))
+
(defmacro without-interrupts (&body body)
#+allegro `(mp:without-scheduling ,@body)
#+clisp `(progn ,@body)
#+cmu `(system:without-interrupts ,@body)
- #+lispworks `(mp:without-preemption ,@body)
+ #+lispworks
+ (if +lw-has-without-preemption+
+ `(mp:without-preemption ,@body)
+ `(mp:with-exclusive-lock (+lw-global-lock+)
+ ,@body))
#+openmcl `(ccl:without-interrupts ,@body)
#+sbcl `(sb-sys::without-interrupts ,@body))
(substitute-string-for-char s #\' "''"))
(defun substitute-string-for-char (procstr match-char subst-str)
-"Substitutes a string for a single matching character of a string"
- (let ((pos (position match-char procstr)))
- (if pos
- (concatenate 'string
- (subseq procstr 0 pos) subst-str
- (substitute-string-for-char
- (subseq procstr (1+ pos)) match-char subst-str))
- procstr)))
+ "Substitutes a string for a single matching character of a string"
+ (when procstr
+ (locally
+ (declare (type string procstr))
+ (let ((pos (position match-char procstr)))
+ (if pos
+ (concatenate 'string
+ (subseq procstr 0 pos) subst-str
+ (substitute-string-for-char
+ (subseq procstr (1+ pos)) match-char subst-str))
+ procstr)))))
(defun position-char (char string start max)
(setq pos (1+ end))))
(defun string-to-list-connection-spec (str)
+ (declare (type string str))
(let ((at-pos (position-char #\@ str 0 (length str))))
(cond
((and at-pos (> (length str) at-pos))
(string-upcase str)))
(defun ensure-keyword (name)
- "Returns keyword for a name"
+ "Returns keyword for a name."
(etypecase name
(keyword name)
(string (nth-value 0 (intern (symbol-name-default-case name) :keyword)))
(eval-when (:compile-toplevel :load-toplevel :execute)
(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
+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)
+ for old-pos = 0 then (+ pos part-length)
+ for pos = (search part string
+ :start2 old-pos
+ :test test)
+ do (write-string string out
+ :start old-pos
+ :end (or pos (length string)))
+ when pos do (write-string replacement out)
+ while pos)
+ (unless stream
+ (get-output-stream-string out))))
+
+
+(defun filter-plist (plist &rest keys-to-remove)
+ "Returns a copy of the given plist with indicated key-value pairs
+removed. keys are searched with #'MEMBER"
+ (declare (dynamic-extent keys-to-remove))
+ (when plist
+ (loop for (k v . rest) = plist then rest
+ unless (member k keys-to-remove)
+ collect k and collect v
+ while rest)))
+
+(defmacro make-weak-hash-table (&rest args)
+ "Creates a weak hash table for use in a cache."
+ `(progn
+
+ ;;NB: These are generally used for caches that may not have an alternate
+ ;;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)
+ (warn "UNSAFE! use of weak hash on implementation without support. (see clsql/sql/utils.lisp to add)")
+
+ (make-hash-table
+ #+allegro :values #+allegro :weak
+ #+clisp :weak #+clisp :value
+ #+lispworks :weak-kind #+lispworks :value
+ #+sbcl :weakness #+sbcl :value
+ ,@args)
+ ))