--- /dev/null
+;;;; -*- Mode: LISP; Syntax: ANSI-Common-Lisp; Base: 10 -*-
+;;;; *************************************************************************
+;;;; FILE IDENTIFICATION
+;;;;
+;;;; Name: loop-extension.lisp
+;;;; Purpose: Extensions to the Loop macro for CMUCL
+;;;; Programmer: Pierre R. Mai
+;;;;
+;;;; Copyright (c) 1999-2001 Pierre R. Mai
+;;;;
+;;;; $Id$
+;;;;
+;;;; The functions in this file were orignally distributed in the
+;;;; MaiSQL package in the file sql/sql.cl
+;;;; *************************************************************************
+
+(in-package #:cl-user)
+
+;;;; MIT-LOOP extension
+
+#+(or cmu scl)
+(defun loop-record-iteration-path (variable data-type prep-phrases)
+ (let ((in-phrase nil)
+ (from-phrase nil))
+ (loop for (prep . rest) in prep-phrases
+ do
+ (case prep
+ ((:in :of)
+ (when in-phrase
+ (ansi-loop::loop-error
+ "Duplicate OF or IN iteration path: ~S." (cons prep rest)))
+ (setq in-phrase rest))
+ ((:from)
+ (when from-phrase
+ (ansi-loop::loop-error
+ "Duplicate FROM iteration path: ~S." (cons prep rest)))
+ (setq from-phrase rest))
+ (t
+ (ansi-loop::loop-error
+ "Unknown preposition: ~S." prep))))
+ (unless in-phrase
+ (ansi-loop::loop-error "Missing OF or IN iteration path."))
+ (unless from-phrase
+ (setq from-phrase '(*default-database*)))
+ (cond
+ ((consp variable)
+ (let ((query-var (ansi-loop::loop-gentemp 'loop-record-))
+ (db-var (ansi-loop::loop-gentemp 'loop-record-database-))
+ (result-set-var (ansi-loop::loop-gentemp
+ 'loop-record-result-set-))
+ (step-var (ansi-loop::loop-gentemp 'loop-record-step-)))
+ (push `(when ,result-set-var
+ (database-dump-result-set ,result-set-var ,db-var))
+ ansi-loop::*loop-epilogue*)
+ `(((,variable nil ,data-type) (,query-var ,(first in-phrase))
+ (,db-var ,(first from-phrase))
+ (,result-set-var nil)
+ (,step-var nil))
+ ((multiple-value-bind (%rs %cols)
+ (database-query-result-set ,query-var ,db-var)
+ (setq ,result-set-var %rs ,step-var (make-list %cols))))
+ ()
+ ()
+ (not (database-store-next-row ,result-set-var ,db-var ,step-var))
+ (,variable ,step-var)
+ (not ,result-set-var)
+ ()
+ (not (database-store-next-row ,result-set-var ,db-var ,step-var))
+ (,variable ,step-var))))
+ (t
+ (let ((query-var (ansi-loop::loop-gentemp 'loop-record-))
+ (db-var (ansi-loop::loop-gentemp 'loop-record-database-))
+ (result-set-var (ansi-loop::loop-gentemp
+ 'loop-record-result-set-)))
+ (push `(when ,result-set-var
+ (database-dump-result-set ,result-set-var ,db-var))
+ ansi-loop::*loop-epilogue*)
+ `(((,variable nil ,data-type) (,query-var ,(first in-phrase))
+ (,db-var ,(first from-phrase))
+ (,result-set-var nil))
+ ((multiple-value-bind (%rs %cols)
+ (database-query-result-set ,query-var ,db-var)
+ (setq ,result-set-var %rs ,variable (make-list %cols))))
+ ()
+ ()
+ (not (database-store-next-row ,result-set-var ,db-var ,variable))
+ ()
+ (not ,result-set-var)
+ ()
+ (not (database-store-next-row ,result-set-var ,db-var ,variable))
+ ()))))))
+
+#+(or cmu scl)
+(ansi-loop::add-loop-path '(record records tuple tuples)
+ 'loop-record-iteration-path
+ ansi-loop::*loop-ansi-universe*
+ :preposition-groups '((:of :in) (:from))
+ :inclusive-permitted nil)