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https://github.com/Gnucash/gnucash.git
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83d14e1c1c
It is split into - /libgnucash (for the non-gui bits) - /gnucash (for the gui) - /common (misc source files used by both) - /bindings (currently only holds python bindings) This is the first step in restructuring the code. It will need much more fine tuning later on.
81 lines
2.9 KiB
Scheme
81 lines
2.9 KiB
Scheme
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; simple-obj.scm
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;;; rudimentary "class" system for straight Scheme
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;;;
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;;; Bill Gribble <grib@billgribble.com> 20 Feb 2000
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; This program is free software; you can redistribute it and/or
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;; modify it under the terms of the GNU General Public License as
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;; published by the Free Software Foundation; either version 2 of
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;; the License, or (at your option) any later version.
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;;
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;; This program is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;;
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;; You should have received a copy of the GNU General Public License
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;; along with this program; if not, contact:
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;;
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;; Free Software Foundation Voice: +1-617-542-5942
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;; 51 Franklin Street, Fifth Floor Fax: +1-617-542-2652
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;; Boston, MA 02110-1301, USA gnu@gnu.org
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; this is an extremely rudimentary object system. Each object is a
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;; cons cell, where the car is a symbol with the class name and the
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;; cdr is a vector of the slots.
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;;
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;; the "class object" is an instance of simple-class which just has
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;; the name of the class and an alist of slot names to vector indices
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;; as its slots.
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;;
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;; by convention, I name class objects (defined with make-simple-class)
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;; <class-name> with class-smybol 'class-name. For example,
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;;
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;; (define <test-class> (make-simple-class 'test-class '(slot-1 slot-2)))
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;; (define t (make-simple-obj <test-class>))
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;; t ==> (test-class . #(#f #f))
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;; the 'simple-class' class.
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(define (make-simple-class class-symbol slot-names)
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(make-record-type (symbol->string class-symbol) slot-names))
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(define (simple-obj-getter class slot)
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(record-accessor class slot))
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(define (simple-obj-setter class slot)
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(record-modifier class slot))
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(define (simple-obj-print obj)
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(write obj))
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(define (simple-obj-to-list obj)
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(let ((retval '()))
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(for-each
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(lambda (slot)
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(let ((thunk (record-accessor (record-type-descriptor obj) slot)))
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(set! retval (cons (thunk obj) retval))))
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(record-type-fields (record-type-descriptor obj)))
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(reverse retval)))
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(define (simple-obj-from-list list type)
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(let ((retval (make-simple-obj type)))
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(for-each
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(lambda (slot)
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(let ((thunk (record-modifier type slot)))
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(thunk retval (car list)))
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(set! list (cdr list)))
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(record-type-fields type))
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retval))
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(define (make-simple-obj class)
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(let ((ctor (record-constructor class))
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(field-defaults
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(map (lambda (v) #f) (record-type-fields class))))
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(apply ctor field-defaults)))
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