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SRFI-35: Provide nice vtable names, to make GOOPS happier.

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* module/srfi/srfi-35.scm (%make-condition-type): New procedure.
  (make-condition-type, make-compound-condition-type): Use it.

* test-suite/tests/srfi-35.test ("condition
  types")["struct-vtable-name"]: New test.
This commit is contained in:
Ludovic Courtès 2009-10-25 22:57:29 +01:00
parent ef171ff039
commit f9e8030266
2 changed files with 25 additions and 13 deletions
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30
srfi/srfi-35.scm
View file

@ -57,6 +57,19 @@
(number->string (object-address ct)
16))))))
(define (%make-condition-type layout id parent all-fields)
(let ((struct (make-struct %condition-type-vtable 0
(make-struct-layout layout) ;; layout
print-condition ;; printer
id parent all-fields)))
;; Hack to associate STRUCT with a name, providing a better name for
;; GOOPS classes as returned by `class-of' et al.
(set-struct-vtable-name! struct (cond ((symbol? id) id)
((string? id) (string->symbol id))
(else (string->symbol ""))))
struct))
(define (condition-type? obj)
"Return true if OBJ is a condition type."
(and (struct? obj)
@ -104,10 +117,8 @@ supertypes."
field-names parent-fields)))
(let* ((all-fields (append parent-fields field-names))
(layout (struct-layout-for-condition all-fields)))
(make-struct %condition-type-vtable 0
(make-struct-layout layout) ;; layout
print-condition ;; printer
id parent all-fields))
(%make-condition-type layout
id parent all-fields))
(error "invalid condition type field names"
field-names)))
(error "parent is not a condition type" parent))
@ -126,13 +137,10 @@ supertypes."
(let* ((all-fields (append-map condition-type-all-fields
parents))
(layout (struct-layout-for-condition all-fields)))
(make-struct %condition-type-vtable 0
(make-struct-layout layout) ;; layout
print-condition ;; printer
id
parents ;; list of parents!
all-fields
all-fields)))))
(%make-condition-type layout
id
parents ;; list of parents!
all-fields)))))
;;;

8
test-suite/tests/srfi-35.test
View file

@ -1,7 +1,7 @@
;;;; srfi-35.test --- Test suite for SRFI-35 -*- Scheme -*-
;;;; Ludovic Courtès <ludo@gnu.org>
;;;;
;;;; Copyright (C) 2007, 2008 Free Software Foundation, Inc.
;;;; Copyright (C) 2007, 2008, 2009 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
@ -34,7 +34,11 @@
(condition-type? &condition))
(pass-if "make-condition-type"
(condition-type? (make-condition-type 'foo &condition '(a b)))))
(condition-type? (make-condition-type 'foo &condition '(a b))))
(pass-if "struct-vtable-name"
(let ((ct (make-condition-type 'chbouib &condition '(a b))))
(eq? 'chbouib (struct-vtable-name ct)))))