summaryrefslogtreecommitdiff
path: root/module/rnrs
diff options
context:
space:
mode:
authorJulian Graham <julian.graham@aya.yale.edu>2010-03-28 22:31:45 -0400
committerJulian Graham <julian.graham@aya.yale.edu>2010-05-20 21:18:03 -0400
commitace75ab775e0eb0eebd4943a5c709ee36fe492eb (patch)
treeb908718826b1e0327d72bc662adad4f0749a8ba7 /module/rnrs
parent0c7398a7dc471bc7b9f09b65dba7e33f4ac88af5 (diff)
downloadguile-ace75ab775e0eb0eebd4943a5c709ee36fe492eb.tar.gz
Implementation and test cases for the R6RS (rnrs enums) library.
* module/Makefile.am: Add rnrs/6/enums.scm to RNRS_SOURCES. * module/rnrs/6/conditions.scm: Fix define-condition-type binding for syntax-violation? predicate. * module/rnrs/6/enums.scm: New file. * test-suite/Makefile.am: Add tests/r6rs-enums.test to SCM_TESTS. * test-suite/tests/r6rs-enums.test: New file.
Diffstat (limited to 'module/rnrs')
-rw-r--r--module/rnrs/6/conditions.scm2
-rw-r--r--module/rnrs/6/enums.scm153
2 files changed, 154 insertions, 1 deletions
diff --git a/module/rnrs/6/conditions.scm b/module/rnrs/6/conditions.scm
index 8ff2f347b..678dc1aec 100644
--- a/module/rnrs/6/conditions.scm
+++ b/module/rnrs/6/conditions.scm
@@ -207,7 +207,7 @@
make-lexical-violation lexical-violation?)
(define-condition-type &syntax &violation
- make-syntax-violation syntax-violation
+ make-syntax-violation syntax-violation?
(form syntax-violation-form)
(subform syntax-violation-subform))
diff --git a/module/rnrs/6/enums.scm b/module/rnrs/6/enums.scm
new file mode 100644
index 000000000..cd7e346ba
--- /dev/null
+++ b/module/rnrs/6/enums.scm
@@ -0,0 +1,153 @@
+;;; enums.scm --- The R6RS enumerations library
+
+;; Copyright (C) 2010 Free Software Foundation, Inc.
+;;
+;; This library is free software; you can redistribute it and/or
+;; modify it under the terms of the GNU Lesser General Public
+;; License as published by the Free Software Foundation; either
+;; version 3 of the License, or (at your option) any later version.
+;;
+;; This library 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
+;; Lesser General Public License for more details.
+;;
+;; You should have received a copy of the GNU Lesser General Public
+;; License along with this library; if not, write to the Free Software
+;; Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+
+
+(library (rnrs enums (6))
+ (export make-enumeration enum-set-universe enum-set-indexer
+ enum-set-constructor enum-set->list enum-set-member? enum-set-subset?
+ enum-set=? enum-set-union enum-set-intersection enum-set-difference
+ enum-set-complement enum-set-projection define-enumeration)
+ (import (only (guile) and=>)
+ (rnrs base (6))
+ (rnrs conditions (6))
+ (rnrs exceptions (6))
+ (rnrs records procedural (6))
+ (rnrs syntax-case (6))
+ (srfi :1))
+
+ (define enum-set-rtd (make-record-type-descriptor
+ 'enum-set #f #f #f #f '#((mutable universe)
+ (immutable set))))
+
+ (define make-enum-set
+ (record-constructor
+ (make-record-constructor-descriptor enum-set-rtd #f #f)))
+
+ (define enum-set-universe-internal (record-accessor enum-set-rtd 0))
+ (define enum-set-universe-set! (record-mutator enum-set-rtd 0))
+
+ (define enum-set-set (record-accessor enum-set-rtd 1))
+
+ (define (make-enumeration symbol-list)
+ (let ((es (make-enum-set #f symbol-list)))
+ (enum-set-universe-set! es es)))
+
+ (define (enum-set-universe enum-set)
+ (or (enum-set-universe-internal enum-set)
+ enum-set))
+
+ (define (enum-set-indexer enum-set)
+ (let* ((symbols (enum-set->list (enum-set-universe enum-set)))
+ (cardinality (length symbols)))
+ (lambda (x)
+ (and=> (memq x symbols)
+ (lambda (probe) (- cardinality (length probe)))))))
+
+ (define (enum-set-constructor enum-set)
+ (lambda (symbol-list)
+ (make-enum-set (enum-set-universe enum-set)
+ (list-copy symbol-list))))
+
+ (define (enum-set->list enum-set)
+ (lset-intersection eq?
+ (enum-set-set (enum-set-universe enum-set))
+ (enum-set-set enum-set)))
+
+ (define (enum-set-member? symbol enum-set)
+ (and (memq symbol (enum-set-set enum-set)) #t))
+
+ (define (enum-set-subset? enum-set-1 enum-set-2)
+ (and (lset<= eq?
+ (enum-set-set (enum-set-universe enum-set-1))
+ (enum-set-set (enum-set-universe enum-set-2)))
+ (lset<= eq? (enum-set-set enum-set-1) (enum-set-set enum-set-2))))
+
+ (define (enum-set=? enum-set-1 enum-set-2)
+ (and (enum-set-subset? enum-set-1 enum-set-2)
+ (enum-set-subset? enum-set-2 enum-set-1)))
+
+ (define (enum-set-union enum-set-1 enum-set-2)
+ (if (eq? (enum-set-universe enum-set-1)
+ (enum-set-universe enum-set-2))
+ (make-enum-set (enum-set-universe enum-set-1)
+ (lset-union eq?
+ (enum-set-set enum-set-1)
+ (enum-set-set enum-set-2)))
+ (raise (make-assertion-violation))))
+
+ (define (enum-set-intersection enum-set-1 enum-set-2)
+ (if (eq? (enum-set-universe enum-set-1)
+ (enum-set-universe enum-set-2))
+ (make-enum-set (enum-set-universe enum-set-1)
+ (lset-intersection eq?
+ (enum-set-set enum-set-1)
+ (enum-set-set enum-set-2)))
+ (raise (make-assertion-violation))))
+
+ (define (enum-set-difference enum-set-1 enum-set-2)
+ (if (eq? (enum-set-universe enum-set-1)
+ (enum-set-universe enum-set-2))
+ (make-enum-set (enum-set-universe enum-set-1)
+ (lset-difference eq?
+ (enum-set-set enum-set-1)
+ (enum-set-set enum-set-2)))
+ (raise (make-assertion-violation))))
+
+ (define (enum-set-complement enum-set)
+ (let ((universe (enum-set-universe enum-set)))
+ (make-enum-set universe
+ (lset-difference
+ eq? (enum-set->list universe) (enum-set-set enum-set)))))
+
+ (define (enum-set-projection enum-set-1 enum-set-2)
+ (make-enum-set (enum-set-universe enum-set-2)
+ (lset-intersection eq?
+ (enum-set-set enum-set-1)
+ (enum-set->list
+ (enum-set-universe enum-set-2)))))
+
+ (define-syntax define-enumeration
+ (syntax-rules ()
+ ((_ type-name (symbol ...) constructor-syntax)
+ (begin
+ (define-syntax type-name
+ (lambda (s)
+ (syntax-case s ()
+ ((type-name sym)
+ (if (memq (syntax->datum #'sym) '(symbol ...))
+ #'(quote sym)
+ (syntax-violation (symbol->string 'type-name)
+ "not a member of the set"
+ #f))))))
+ (define-syntax constructor-syntax
+ (lambda (s)
+ (syntax-case s ()
+ ((_) (syntax #f))
+ ((_ sym (... ...))
+ (let* ((universe '(symbol ...))
+ (syms (syntax->datum #'(sym (... ...))))
+ (quoted-universe
+ (datum->syntax s (list 'quote universe)))
+ (quoted-syms (datum->syntax s (list 'quote syms))))
+ (or (every (lambda (x) (memq x universe)) syms)
+ (syntax-violation (symbol->string 'constructor-syntax)
+ "not a subset of the universe"
+ #f))
+ #`((enum-set-constructor (make-enumeration #,quoted-universe))
+ #,quoted-syms))))))))))
+)