summaryrefslogtreecommitdiffstats
path: root/recobj.scm
diff options
context:
space:
mode:
Diffstat (limited to 'recobj.scm')
-rw-r--r--recobj.scm54
1 files changed, 54 insertions, 0 deletions
diff --git a/recobj.scm b/recobj.scm
new file mode 100644
index 0000000..caf55a6
--- /dev/null
+++ b/recobj.scm
@@ -0,0 +1,54 @@
+;;; "recobj.scm" Records implemented as objects.
+;;;From: whumeniu@datap.ca (Wade Humeniuk)
+
+(require 'object)
+
+(define record-type-name (make-generic-method))
+(define record-accessor (make-generic-method))
+(define record-modifier (make-generic-method))
+(define record? (make-generic-predicate))
+(define record-constructor (make-generic-method))
+
+(define (make-record-type type-name field-names)
+ (define self (make-object))
+
+ (make-method! self record-type-name
+ (lambda (self)
+ type-name))
+ (make-method! self record-accessor
+ (lambda (self field-name)
+ (let ((index (comlist:position field-name field-names)))
+ (if (not index)
+ (slib:error "record-accessor: invalid field-name argument."
+ field-name))
+ (lambda (obj)
+ (record-accessor obj index)))))
+
+ (make-method! self record-modifier
+ (lambda (self field)
+ (let ((index (comlist:position field field-names)))
+ (if (not index)
+ (slib:error "record-accessor: invalid field-name argument."
+ field-name))
+ (lambda (obj newval)
+ (record-modifier obj index newval)))))
+
+ (make-method! self record? (lambda (self) #t))
+
+ (make-method! self record-constructor
+ (lambda (class . field-values)
+ (let ((values (apply vector field-values)))
+ (define self (make-object))
+ (make-method! self record-accessor
+ (lambda (self index)
+ (vector-ref values index)))
+ (make-method! self record-modifier
+ (lambda (self index newval)
+ (vector-set! values index newval)))
+ (make-method! self record-type-name
+ (lambda (self) (record-type-name class)))
+ self)))
+ self)
+
+(provide 'record-object)
+(provide 'record) \ No newline at end of file