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authorBryan Newbold <bnewbold@robocracy.org>2017-02-20 00:05:25 -0800
committerBryan Newbold <bnewbold@robocracy.org>2017-02-20 00:05:25 -0800
commit8ffbc2df0fde83082610149d24e594c1cd879f4a (patch)
treea2be9aad5101c5e450ad141d15c514bc9c2a2963 /recobj.scm
downloadslib-8ffbc2df0fde83082610149d24e594c1cd879f4a.tar.gz
slib-8ffbc2df0fde83082610149d24e594c1cd879f4a.zip
Import Upstream version 2a6upstream/2a6
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
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+;;; "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