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fix xml/plist, which doesn't use xexprs

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svn: r13324
This commit is contained in:
Matthew Flatt 2009-01-30 14:38:44 +00:00
parent 65f3ec4656
commit cebd9282b1
2 changed files with 36 additions and 12 deletions
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27
collects/xml/plist.ss
View File

@ -15,6 +15,29 @@
; an array : (list 'array value ...)
; (we're ignoring data & date)
(define (plist-dict? v)
(and (list? v)
(pair? v)
(eq? (car v) 'dict)
(andmap (lambda (v)
(and (list? v)
(= 3 (length v))
(eq? (car v) 'assoc-pair)
(string? (cadr v))
(let pl-value? ([v (caddr v)])
(or (string? v)
(and (pair? v)
(case (car v)
[(true) (null? (cdr v))]
[(false) (null? (cdr v))]
[(integer) (and (= (length v) 2)
(exact-integer? (cadr v)))]
[(real) (and (= (length v) 2)
(real? (cadr v)))]
[(array) (andmap pl-value? (cdr v))]
[else (plist-dict? v)]))))))
(cdr v))))
; raise-plist-exn : string mark-set xexpr symbol -> ???
(define (raise-plist-exn tag mark-set xexpr type)
@ -191,5 +214,5 @@
;; END OF TEST
(provide read-plist)
(provide/contract [write-plist (xexpr/c output-port? . -> . void?)]))
(provide plist-dict? read-plist)
(provide/contract [write-plist (plist-dict? output-port? . -> . void?)]))

21
collects/xml/xml.scrbl
View File

@ -359,9 +359,8 @@ used to store dictionaries of string--value associations. This format
is used by Mac OS X (both the operating system and its applications)
to store all kinds of data.
A @deftech{dictionary X-expression} is an @tech{X-expression} that
could be create by an expression matching the following
@scheme[_dict-expr] grammar:
A @deftech{plist dictionary} is a value that could be created by an
expression matching the following @scheme[_dict-expr] grammar:
@schemegrammar*[
#:literals (list)
@ -376,16 +375,18 @@ could be create by an expression matching the following
(list 'array pl-value ...)]
]
@defproc[(read-plist [in input-port?]) xexpr/c]{
@defproc[(plist-dict? [any/c v]) boolean?]{
Reads a plist from a port, and produces a @tech{dictionary
X-expression}.}
Returns @scheme[#t] if @scheme[v] is a @tech{plist dictionary},
@scheme[#f] otherwise.}
@defproc[(write-plist [dict xexpr/c] [out output-port?]) void?]{
@defproc[(read-plist [in input-port?]) plist-dict?]{
Write a plist to the given port. If @scheme[dict] is not a
@tech{dictionary X-expression}, the @scheme[exn:fail:contract]
exception is raised.}
Reads a plist from a port, and produces a @tech{plist dictionary}.}
@defproc[(write-plist [dict plist-dict?] [out output-port?]) void?]{
Write a @tech{plist dictionary} to the given port.}
@examples[
#:eval plist-eval