From a6fd89a4975cde56bf42c452257dc0070b4525d5 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Martin=20Grabm=C3=BCller?= <mgrabmue@cs.tu-berlin.de>
Date: Fri, 27 Apr 2001 05:47:58 +0000
Subject: [PATCH] 	* Makefile.am (srfi_DATA): Added srfi-9.scm.

	* srfi-9.scm: New file.  Exports `define-record-type'.
---
 srfi/ChangeLog   |  6 ++++
 srfi/Makefile.am |  1 +
 srfi/srfi-9.scm  | 85 ++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 92 insertions(+)
 create mode 100644 srfi/srfi-9.scm

diff --git a/srfi/ChangeLog b/srfi/ChangeLog
index 04dcf8567..8e2c0b759 100644
--- a/srfi/ChangeLog
+++ b/srfi/ChangeLog
@@ -1,3 +1,9 @@
+2001-04-27  Martin Grabmueller  <mgrabmue@cs.tu-berlin.de>
+
+	* Makefile.am (srfi_DATA): Added srfi-9.scm.
+
+	* srfi-9.scm: New file.  Exports `define-record-type'.
+
 2001-04-26  Rob Browning  <rlb@cs.utexas.edu>
 
 	* Makefile.am (srfi_DATA): added srfi-6.scm.
diff --git a/srfi/Makefile.am b/srfi/Makefile.am
index 804c2f882..5eb8eb9cc 100644
--- a/srfi/Makefile.am
+++ b/srfi/Makefile.am
@@ -42,6 +42,7 @@ srfidir = $(datadir)/guile/$(VERSION)/srfi
 srfi_DATA = srfi-2.scm \
             srfi-6.scm \
             srfi-8.scm \
+            srfi-9.scm \
             srfi-11.scm \
             srfi-13.scm \
             srfi-14.scm
diff --git a/srfi/srfi-9.scm b/srfi/srfi-9.scm
new file mode 100644
index 000000000..fb61dfec0
--- /dev/null
+++ b/srfi/srfi-9.scm
@@ -0,0 +1,85 @@
+;;;; srfi-9.scm --- SRFI-9 procedures for Guile
+;;;;
+;;;; 	Copyright (C) 2001 Free Software Foundation, Inc.
+;;;; 
+;;;; This program is free software; you can redistribute it and/or
+;;;; modify it under the terms of the GNU General Public License as
+;;;; published by the Free Software Foundation; either version 2, or
+;;;; (at your option) any later version.
+;;;; 
+;;;; This program is distributed in the hope that it will be useful,
+;;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;;;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+;;;; General Public License for more details.
+;;;; 
+;;;; You should have received a copy of the GNU General Public License
+;;;; along with this software; see the file COPYING.  If not, write to
+;;;; the Free Software Foundation, Inc., 59 Temple Place, Suite 330,
+;;;; Boston, MA 02111-1307 USA
+
+;;; This module exports the syntactic form `define-record-type', which
+;;; is the means for creating record types defined in SRFI-9.
+;;;
+;;; The syntax of a record type definition is:
+;;;
+;;;  <record type definition>
+;;;    -> (define-record-type <type name>
+;;;         (<constructor name> <field tag> ...)
+;;;         <predicate name>
+;;;         <field spec> ...)
+;;;
+;;;  <field spec> -> (<field tag> <accessor name>)
+;;;               -> (<field tag> <accessor name> <modifier name>)
+;;;
+;;;  <field tag> -> <identifier>
+;;;  <... name>  -> <identifier>
+;;;
+;;; Usage example:
+;;;
+;;; guile> (use-modules (srfi srfi-9))
+;;; guile> (define-record-type :foo (make-foo x) foo? 
+;;;                            (x get-x) (y get-y set-y!))
+;;; guile> (define f (make-foo 1))
+;;; guile> f
+;;; #<:foo x: 1 y: #f>
+;;; guile> (get-x f)
+;;; 1
+;;; guile> (set-y! f 2)
+;;; 2
+;;; guile> (get-y f)
+;;; 2
+;;; guile> f
+;;; #<:foo x: 1 y: 2>
+;;; guile> (foo? f)
+;;; #t
+;;; guile> (foo? 1)
+;;; #f
+
+(define-module (srfi srfi-9))
+
+(export-syntax define-record-type)
+
+(define-macro (define-record-type type-name constructor/field-tag
+		predicate-name . field-specs)
+  `(begin
+     (define ,type-name
+       (make-record-type ',type-name ',(map car field-specs)))
+     (define ,(car constructor/field-tag)
+       (record-constructor ,type-name ',(cdr constructor/field-tag)))
+     (define ,predicate-name
+       (record-predicate ,type-name))
+     ,@(map
+	(lambda (spec)
+	  (cond
+	   ((= (length spec) 2)
+	    `(define ,(cadr spec)
+	       (record-accessor ,type-name ',(car spec))))
+	   ((= (length spec) 3)
+	    `(begin
+	       (define ,(cadr spec)
+		 (record-accessor ,type-name ',(car spec)))
+	       (define ,(caddr spec)
+		 (record-modifier ,type-name ',(car spec)))))
+	   (else
+	    (error "invalid field spec " spec))))
+	field-specs)))