/usr/share/common-lisp/source/clsql/sql/utils.lisp is in cl-sql 6.7.0-1.1.
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;;;; *************************************************************************
;;;; FILE IDENTIFICATION
;;;;
;;;; Name: utils.lisp
;;;; Purpose: SQL utility functions
;;;; Programmer: Kevin M. Rosenberg
;;;; Date Started: Mar 2002
;;;;
;;;; 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
;;;; (http://opensource.franz.com/preamble.html), also known as the LLGPL.
;;;; *************************************************************************
(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))
(integer v)
(number (truncate v))))
(defun dequote (it)
(if (and (listp it) (eql (first it) 'quote))
(second it)
it))
(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
(princ-to-string num))
(rational
(float-to-sql-string (coerce num 'double-float)))
(number
(float-to-sql-string num))))
(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))
((find #\d str)
(substitute #\e #\d str))
((find #\l str)
(substitute #\e #\l str))
((find #\s str)
(substitute #\e #\S str))
((find #\F str)
(substitute #\e #\F str))
((find #\D str)
(substitute #\e #\D str))
((find #\L str)
(substitute #\e #\L str))
((find #\S str)
(substitute #\e #\S str))
(t
str))))
(defun sql-escape (identifier)
"Change hyphens to underscores, ensure string"
(let ((unescaped (etypecase identifier
(symbol (symbol-name identifier))
(string identifier))))
(substitute #\_ #\- unescaped)))
#+lispworks
(defvar +lw-has-without-preemption+
#-(or lispworks5 lispworks4) nil
#+(or lispworks5 lispworks4) 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
(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))
(defun make-process-lock (name)
#+allegro (mp:make-process-lock :name name)
#+cmu (mp:make-lock name)
#+lispworks (mp:make-lock :name name)
#+openmcl (ccl:make-lock name)
#+sb-thread (sb-thread:make-mutex :name name)
#+scl (thread:make-lock name)
#-(or allegro cmu lispworks openmcl sb-thread scl) (declare (ignore name))
#-(or allegro cmu lispworks openmcl sb-thread scl) nil)
(defmacro with-process-lock ((lock desc) &body body)
#+(or cmu allegro lispworks openmcl sb-thread)
(declare (ignore desc))
#+(or allegro cmu lispworks openmcl sb-thread)
(let ((l (gensym)))
`(let ((,l ,lock))
#+allegro (mp:with-process-lock (,l) ,@body)
#+cmu (mp:with-lock-held (,l) ,@body)
#+openmcl (ccl:with-lock-grabbed (,l) ,@body)
#+lispworks (mp:with-lock (,l) ,@body)
#+sb-thread (sb-thread:with-recursive-lock (,l) ,@body)
))
#+scl `(thread:with-lock-held (,lock ,desc) ,@body)
#-(or cmu allegro lispworks openmcl sb-thread scl) (declare
(ignore lock desc))
#-(or cmu allegro lispworks openmcl sb-thread scl) `(progn ,@body))
(defun sql-escape-quotes (s)
"Escape quotes for SQL string writing"
(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"
(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)
"From KMRCL."
(declare (optimize (speed 3) (safety 0) (space 0))
(fixnum start max) (simple-string string))
(do* ((i start (1+ i)))
((= i max) nil)
(declare (fixnum i))
(when (char= char (schar string i)) (return i))))
(defun delimited-string-to-list (string &optional (separator #\space)
skip-terminal)
"Split a string with delimiter, from KMRCL."
(declare (optimize (speed 3) (safety 0) (space 0) (compilation-speed 0))
(type string string)
(type character separator))
(do* ((len (length string))
(output '())
(pos 0)
(end (position-char separator string pos len)
(position-char separator string pos len)))
((null end)
(if (< pos len)
(push (subseq string pos) output)
(when (or (not skip-terminal) (zerop len))
(push "" output)))
(nreverse output))
(declare (type fixnum pos len)
(type (or null fixnum) end))
(push (subseq string pos end) output)
(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))
;; Connection spec is SQL*NET format
(cons (subseq str (1+ at-pos))
(delimited-string-to-list (subseq str 0 at-pos) #\/)))
(t
(delimited-string-to-list str #\/)))))
#+allegro
(eval-when (:compile-toplevel :load-toplevel :execute)
(unless (find-package '#:excl.osi)
(require 'osi)))
(defun command-output (control-string &rest args)
;; Concatenates output and error since Lispworks combines
;; these, thus CLSQL can't depend upon separate results
(multiple-value-bind (output error status)
(apply #'%command-output control-string args)
(values
(concatenate 'string (if output output "")
(if error error ""))
status)))
(defun read-stream-to-string (in)
(with-output-to-string (out)
(let ((eof (gensym)))
(do ((line (read-line in nil eof)
(read-line in nil eof)))
((eq line eof))
(format out "~A~%" line)))))
;; From KMRCL
(defun %command-output (control-string &rest args)
"Interpolate ARGS into CONTROL-STRING as if by FORMAT, and
synchronously execute the result using a Bourne-compatible shell,
returns (VALUES string-output error-output exit-status)"
(let ((command (apply #'format nil control-string args)))
#+sbcl
(let* ((process (sb-ext:run-program
"/bin/sh"
(list "-c" command)
:input nil :output :stream :error :stream))
(output (read-stream-to-string (sb-impl::process-output process)))
(error (read-stream-to-string (sb-impl::process-error process))))
(close (sb-impl::process-output process))
(close (sb-impl::process-error process))
(values
output
error
(sb-impl::process-exit-code process)))
#+(or cmu scl)
(let* ((process (ext:run-program
"/bin/sh"
(list "-c" command)
:input nil :output :stream :error :stream))
(output (read-stream-to-string (ext::process-output process)))
(error (read-stream-to-string (ext::process-error process))))
(close (ext::process-output process))
(close (ext::process-error process))
(values
output
error
(ext::process-exit-code process)))
#+allegro
(multiple-value-bind (output error status)
(excl.osi:command-output command :whole t)
(values output error status))
#+lispworks
;; BUG: Lispworks combines output and error streams
(let ((output (make-string-output-stream)))
(unwind-protect
(let ((status
(system:call-system-showing-output
command
:shell-type "/bin/sh"
:output-stream output)))
(values (get-output-stream-string output) nil status))
(close output)))
#+clisp
;; BUG: CLisp doesn't allow output to user-specified stream
(values
nil
nil
(ext:run-shell-command command :output :terminal :wait t))
#+openmcl
(let* ((process (ccl:run-program
"/bin/sh"
(list "-c" command)
:input nil :output :stream :error :stream
:wait t))
(output (read-stream-to-string (ccl::external-process-output-stream process)))
(error (read-stream-to-string (ccl::external-process-error-stream process))))
(close (ccl::external-process-output-stream process))
(close (ccl::external-process-error-stream process))
(values output
error
(nth-value 1 (ccl::external-process-status process))))
#-(or openmcl clisp lispworks allegro scl cmu sbcl)
(error "COMMAND-OUTPUT not implemented for this Lisp")
))
;; From KMRCL
(defmacro in (obj &rest choices)
(let ((insym (gensym)))
`(let ((,insym ,obj))
(or ,@(mapcar #'(lambda (c) `(eql ,insym ,c))
choices)))))
;; From KMRCL
(defun substitute-char-string (procstr match-char subst-str)
"Substitutes a string for a single matching character of a string"
(substitute-chars-strings procstr (list (cons match-char subst-str))))
(defun replaced-string-length (str repl-alist)
(declare (simple-string str)
(optimize (speed 3) (safety 0) (space 0)))
(do* ((i 0 (1+ i))
(orig-len (length str))
(new-len orig-len))
((= i orig-len) new-len)
(declare (fixnum i orig-len new-len))
(let* ((c (char str i))
(match (assoc c repl-alist :test #'char=)))
(declare (character c))
(when match
(incf new-len (1- (length
(the simple-string (cdr match)))))))))
(defun substitute-chars-strings (str repl-alist)
"Replace all instances of a chars with a string. repl-alist is an assoc
list of characters and replacement strings."
(declare (simple-string str)
(optimize (speed 3) (safety 0) (space 0)))
(do* ((orig-len (length str))
(new-string (make-string (replaced-string-length str repl-alist)))
(spos 0 (1+ spos))
(dpos 0))
((>= spos orig-len)
new-string)
(declare (fixnum spos dpos) (simple-string new-string))
(let* ((c (char str spos))
(match (assoc c repl-alist :test #'char=)))
(declare (character c))
(if match
(let* ((subst (cdr match))
(len (length subst)))
(declare (fixnum len)
(simple-string subst))
(dotimes (j len)
(declare (fixnum j))
(setf (char new-string dpos) (char subst j))
(incf dpos)))
(progn
(setf (char new-string dpos) c)
(incf dpos))))))
(defun getenv (var)
"Return the value of the environment variable."
#+allegro (sys::getenv (string var))
#+clisp (ext:getenv (string var))
#+(or cmu scl)
(cdr (assoc (string var) ext:*environment-list* :test #'equalp
:key #'string))
#+lispworks (lw:environment-variable (string var))
#+ccl (ccl::getenv var)
#+sbcl (sb-ext:posix-getenv var))
(eval-when (:compile-toplevel :load-toplevel :execute)
(when (char= #\a (schar (symbol-name '#:a) 0))
(pushnew :clsql-lowercase-reader *features*)))
(defun symbol-name-default-case (str)
#-clsql-lowercase-reader
(string-upcase str)
#+clsql-lowercase-reader
(string-downcase str))
(defun convert-to-db-default-case (str database)
(if database
(case (db-type-default-case (database-underlying-type database))
(:upper (string-upcase str))
(:lower (string-downcase str))
(t str))
;; Default CommonSQL behavior is to upcase strings
(string-upcase str)))
(defun ensure-keyword (name)
"Returns keyword for a name."
(etypecase name
(keyword name)
(string (nth-value 0 (intern (symbol-name-default-case name) :keyword)))
(symbol (nth-value 0 (intern (symbol-name 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 read-decimal-value (string)
(let* ((comma 0)
(dot 0)
(last))
(loop for c across string
do (case c
(#\. (incf dot) (setf last 'dot))
(#\, (incf comma) (setf last 'comma))))
(let* ((bag (if (and (eql last 'dot) (eql dot 1))
".0123456789+-"
",0123456789+-"))
(clean (with-output-to-string (out)
(loop for c across string
do (when (find c bag :test #'char=)
(write-char c out))))))
(if (and (eql last 'dot) (eql dot 1))
(decimals:parse-decimal-number clean)
(decimals:parse-decimal-number
clean :decimal-separator #\,)))))
(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 ccl)
(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
#+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))
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