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Fix hygiene issues with `define-record-type'

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* module/rnrs/records/syntactic.scm (define-record-type0, process-fields):
  Preserve hygiene of record clauses.

* test-suite/tests/r6rs-records-syntactic.test ("record hygiene"):
  Add tests.
This commit is contained in:
Ian Price 2011-06-11 02:43:08 +01:00 • committed by Andy Wingo
parent d1f2417102
commit 5f09e4ba3c
2 changed files with 181 additions and 157 deletions
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246
module/rnrs/records/syntactic.scm
View file

@ -21,7 +21,7 @@
(export define-record-type
record-type-descriptor
record-constructor-descriptor)
(import (only (guile) *unspecified* and=> gensym unspecified?)
(import (only (guile) and=> gensym)
(rnrs base (6))
(rnrs conditions (6))
(rnrs exceptions (6))
@ -75,104 +75,98 @@
(number-fields-inner fields 0))
(define (process-fields record-name fields)
(define record-name-str (symbol->string record-name))
(define (wrap x) (datum->syntax record-name x))
(define (id->string x)
(symbol->string (syntax->datum x)))
(define record-name-str (id->string record-name))
(define (guess-accessor-name field-name)
(wrap
(string->symbol (string-append
record-name-str "-" (symbol->string field-name))))
record-name-str "-" (id->string field-name)))))
(define (guess-mutator-name field-name)
(wrap
(string->symbol
(string-append
record-name-str "-" (symbol->string field-name) "-set!")))
record-name-str "-" (id->string field-name) "-set!"))))
(define (f x)
(define (lose)
(syntax-violation 'define-record-type "invalid field specifier" x))
(cond ((symbol? x) (list 'immutable x (guess-accessor-name x) #f))
((not (list? x)) (lose))
((eq? (car x) 'immutable)
(cons 'immutable
(case (length x)
((2) (list (cadr x) (guess-accessor-name (cadr x)) #f))
((3) (list (cadr x) (caddr x) #f))
(else (lose)))))
((eq? (car x) 'mutable)
(cons 'mutable
(case (length x)
((2) (list (cadr x)
(guess-accessor-name (cadr x))
(guess-mutator-name (cadr x))))
((4) (cdr x))
(else (lose)))))
(else (lose))))
(syntax-case x (immutable mutable)
[(immutable name)
(list (wrap `(immutable ,(syntax->datum #'name)))
(guess-accessor-name #'name)
#f)]
[(immutable name accessor)
(list (wrap `(immutable ,(syntax->datum #'name))) #'accessor #f)]
[(mutable name)
(list (wrap `(mutable ,(syntax->datum #'name)))
(guess-accessor-name #'name)
(guess-mutator-name #'name))]
[(mutable name accessor mutator)
(list (wrap `(mutable ,(syntax->datum #'name))) #'accessor #'mutator)]
[name
(identifier? #'name)
(list (wrap `(immutable ,(syntax->datum #'name)))
(guess-accessor-name #'name)
#f)]
[else
(syntax-violation 'define-record-type "invalid field specifier" x)]))
(map f fields))
(define-syntax define-record-type0
(lambda (stx)
(define *unspecified* (cons #f #f))
(define (unspecified? obj)
(eq? *unspecified* obj))
(syntax-case stx ()
((_ (record-name constructor-name predicate-name) record-clause ...)
(let loop ((fields *unspecified*)
(parent *unspecified*)
(protocol *unspecified*)
(sealed *unspecified*)
(opaque *unspecified*)
(nongenerative *unspecified*)
(constructor *unspecified*)
(parent-rtd *unspecified*)
(record-clauses (syntax->datum #'(record-clause ...))))
(if (null? record-clauses)
(let*
((fields (if (unspecified? fields) '() fields))
(field-names
(datum->syntax
#'record-name
(list->vector (map (lambda (x) (take x 2)) fields))))
(let loop ((_fields *unspecified*)
(_parent *unspecified*)
(_protocol *unspecified*)
(_sealed *unspecified*)
(_opaque *unspecified*)
(_nongenerative *unspecified*)
(_constructor *unspecified*)
(_parent-rtd *unspecified*)
(record-clauses #'(record-clause ...)))
(syntax-case record-clauses
(fields parent protocol sealed opaque nongenerative
constructor parent-rtd)
[()
(let* ((fields (if (unspecified? _fields) '() _fields))
(field-names (list->vector (map car fields)))
(field-accessors
(fold-left (lambda (x c lst)
(cons #`(define #,(datum->syntax
#'record-name (caddr x))
(cons #`(define #,(cadr x)
(record-accessor record-name #,c))
lst))
'() fields (sequence (length fields))))
(field-mutators
(fold-left (lambda (x c lst)
(if (cadddr x)
(cons #`(define #,(datum->syntax
#'record-name (cadddr x))
(record-mutator record-name #,c))
(if (caddr x)
(cons #`(define #,(caddr x)
(record-mutator record-name
#,c))
lst)
lst))
'() fields (sequence (length fields))))
(parent-cd
(datum->syntax
stx (cond ((not (unspecified? parent))
`(record-constructor-descriptor ,parent))
((not (unspecified? parent-rtd)) (cadr parent-rtd))
(else #f))))
(parent-rtd
(datum->syntax
stx (cond ((not (unspecified? parent))
`(record-type-descriptor ,parent))
((not (unspecified? parent-rtd)) (car parent-rtd))
(else #f))))
(protocol (datum->syntax
#'record-name (if (unspecified? protocol)
#f protocol)))
(uid (datum->syntax
#'record-name (if (unspecified? nongenerative)
#f nongenerative)))
(sealed? (if (unspecified? sealed) #f sealed))
(opaque? (if (unspecified? opaque) #f opaque))
(record-name-sym (datum->syntax
stx (list 'quote
(syntax->datum #'record-name)))))
(parent-cd (cond ((not (unspecified? _parent))
#`(record-constructor-descriptor
#,_parent))
((not (unspecified? _parent-rtd))
(cadr _parent-rtd))
(else #f)))
(parent-rtd (cond ((not (unspecified? _parent))
#`(record-type-descriptor #,_parent))
((not (unspecified? _parent-rtd))
(car _parent-rtd))
(else #f)))
(protocol (if (unspecified? _protocol) #f _protocol))
(uid (if (unspecified? _nongenerative) #f _nongenerative))
(sealed? (if (unspecified? _sealed) #f _sealed))
(opaque? (if (unspecified? _opaque) #f _opaque)))
#`(begin
(define record-name
(make-record-type-descriptor
#,record-name-sym
(quote record-name)
#,parent-rtd #,uid #,sealed? #,opaque?
#,field-names))
(define constructor-name
@ -182,65 +176,61 @@
(define dummy
(let ()
(register-record-type
#,record-name-sym
(quote record-name)
record-name (make-record-constructor-descriptor
record-name #,parent-cd #,protocol))
'dummy))
(define predicate-name (record-predicate record-name))
#,@field-accessors
#,@field-mutators))
(let ((cr (car record-clauses)))
(case (car cr)
((fields)
(if (unspecified? fields)
(loop (process-fields (syntax->datum #'record-name)
(cdr cr))
parent protocol sealed opaque nongenerative
constructor parent-rtd (cdr record-clauses))
(raise (make-assertion-violation))))
((parent)
(if (not (unspecified? parent-rtd))
(raise (make-assertion-violation)))
(if (unspecified? parent)
(loop fields (cadr cr) protocol sealed opaque
nongenerative constructor parent-rtd
(cdr record-clauses))
(raise (make-assertion-violation))))
((protocol)
(if (unspecified? protocol)
(loop fields parent (cadr cr) sealed opaque
nongenerative constructor parent-rtd
(cdr record-clauses))
(raise (make-assertion-violation))))
((sealed)
(if (unspecified? sealed)
(loop fields parent protocol (cadr cr) opaque
nongenerative constructor parent-rtd
(cdr record-clauses))
(raise (make-assertion-violation))))
((opaque) (if (unspecified? opaque)
(loop fields parent protocol sealed (cadr cr)
nongenerative constructor parent-rtd
(cdr record-clauses))
(raise (make-assertion-violation))))
((nongenerative)
(if (unspecified? nongenerative)
(let ((uid (list 'quote
(or (and (> (length cr) 1) (cadr cr))
(gensym)))))
(loop fields parent protocol sealed
opaque uid constructor
parent-rtd (cdr record-clauses)))
(raise (make-assertion-violation))))
((parent-rtd)
(if (not (unspecified? parent))
(raise (make-assertion-violation)))
(if (unspecified? parent-rtd)
(loop fields parent protocol sealed opaque
nongenerative constructor (cdr cr)
(cdr record-clauses))
(raise (make-assertion-violation))))
(else (raise (make-assertion-violation)))))))))))
#,@field-mutators))]
[((fields record-fields ...) . rest)
(if (unspecified? _fields)
(loop (process-fields #'record-name #'(record-fields ...))
_parent _protocol _sealed _opaque _nongenerative
_constructor _parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((parent parent-name) . rest)
(if (not (unspecified? _parent-rtd))
(raise (make-assertion-violation))
(if (unspecified? _parent)
(loop _fields #'parent-name _protocol _sealed _opaque
_nongenerative _constructor _parent-rtd #'rest)
(raise (make-assertion-violation))))]
[((protocol expression) . rest)
(if (unspecified? _protocol)
(loop _fields _parent #'expression _sealed _opaque
_nongenerative _constructor _parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((sealed sealed?) . rest)
(if (unspecified? _sealed)
(loop _fields _parent _protocol #'sealed? _opaque
_nongenerative _constructor _parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((opaque opaque?) . rest)
(if (unspecified? _opaque)
(loop _fields _parent _protocol _sealed #'opaque?
_nongenerative _constructor _parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((nongenerative) . rest)
(if (unspecified? _nongenerative)
(loop _fields _parent _protocol _sealed _opaque
#`(quote #,(datum->syntax #'record-name (gensym)))
_constructor _parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((nongenerative uid) . rest)
(if (unspecified? _nongenerative)
(loop _fields _parent _protocol _sealed
_opaque #''uid _constructor
_parent-rtd #'rest)
(raise (make-assertion-violation)))]
[((parent-rtd rtd cd) . rest)
(if (not (unspecified? _parent))
(raise (make-assertion-violation))
(if (unspecified? _parent-rtd)
(loop _fields _parent _protocol _sealed _opaque
_nongenerative _constructor #'(rtd cd)
#'rest)
(raise (make-assertion-violation))))]))))))
(define-syntax record-type-descriptor
(lambda (stx)

42
test-suite/tests/r6rs-records-syntactic.test
View file

@ -19,10 +19,13 @@
(define-module (test-suite test-rnrs-records-syntactic)
:use-module ((rnrs records syntactic) :version (6))
:use-module ((rnrs records procedural) :version (6))
:use-module ((rnrs records inspection) :version (6))
:use-module (test-suite lib))
#:use-module ((rnrs records syntactic) #:version (6))
#:use-module ((rnrs records procedural) #:version (6))
#:use-module ((rnrs records inspection) #:version (6))
#:use-module ((rnrs conditions) #:version (6))
#:use-module ((rnrs exceptions) #:version (6))
#:use-module ((system base compile) #:select (compile))
#:use-module (test-suite lib))
(define-record-type simple-rtd)
(define-record-type
@ -115,3 +118,34 @@
(pass-if "record-constructor-descriptor returns rcd"
(procedure? (record-constructor (record-constructor-descriptor simple-rtd))))
(with-test-prefix "record hygiene"
(pass-if-exception "using shadowed record keywords fails" exception:syntax-pattern-unmatched
(compile '(let ((fields #f))
(define-record-type foo (fields bar))
#t)
#:env (current-module)))
(pass-if "using shadowed record keywords fails 2"
(guard (condition ((syntax-violation? condition) #t))
(compile '(let ((immutable #f))
(define-record-type foo (fields (immutable bar)))
#t)
#:env (current-module))
#f))
(pass-if "hygiene preserved when using macros"
(compile '(begin
(define pass #t)
(define-syntax define-record
(syntax-rules ()
((define-record name field)
(define-record-type name
(protocol
(lambda (x)
(lambda ()
;; pass refers to pass in scope of macro not use
(x pass))))
(fields field)))))
(let ((pass #f))
(define-record foo bar)
(foo-bar (make-foo))))
#:env (current-module))))