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[honu] allow multiple variables to be declared at once

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This commit is contained in:
Jon Rafkind 2011-11-14 17:48:14 -07:00
parent 9ec39fd590
commit 1f8c1950fb
2 changed files with 26 additions and 18 deletions
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2
collects/honu/core/private/class.rkt
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@ -19,7 +19,7 @@
[pattern method:honu-function
#:with result (replace-with-public #'method.result)]
[pattern var:honu-declaration
#:with result #'(field [var.name var.expression])]))
#:with result #'(field [var.name var.expression] ...)]))
(provide honu-class)
(define-honu-syntax honu-class

42
collects/honu/core/private/honu2.rkt
View File

@ -12,6 +12,7 @@
honu-in
honu-prefix
semicolon
honu-comma
define-literal
%racket)
(for-syntax syntax/parse
@ -38,23 +39,6 @@
#'rest
#f)])))
(begin-for-syntax
(provide honu-declaration)
(define-splicing-syntax-class honu-declaration
#:literal-sets (cruft)
#:literals (honu-equal honu-var)
[pattern (~seq honu-var name:id honu-equal one:honu-expression)
#:with result #'(%racket (define name one.result))
#:with expression #'one.result]))
(provide honu-var)
(define-honu-syntax honu-var
(lambda (code context)
(syntax-parse code #:literal-sets (cruft)
#:literals (honu-equal)
[(var:honu-declaration . rest)
(values #'var.result #'rest #t)])))
(provide honu-for)
(define-honu-syntax honu-for
(lambda (code context)
@ -274,3 +258,27 @@
(with-syntax ([left left])
(values #'(send/apply left name (list argument.result ...))
#'more))])))
(begin-for-syntax
(provide honu-declaration)
(define-literal-set declaration-literals (honu-comma honu-equal))
(define-splicing-syntax-class var-id
[pattern x:id #:when (not ((literal-set->predicate declaration-literals) #'x))])
(define-splicing-syntax-class honu-declaration
#:literal-sets (cruft)
#:literals (honu-equal honu-var)
[pattern (~seq honu-var (~seq name*:var-id (~optional honu-comma)) ... honu-equal one:honu-expression)
#:with result #'(%racket (define-values (name*.x ...) one.result))
#:with (name ...) #'(name*.x ...)
#:with expression #'one.result]))
(provide honu-var)
(define-honu-syntax honu-var
(lambda (code context)
(syntax-parse code #:literal-sets (cruft)
#:literals (honu-equal)
[(var:honu-declaration . rest)
(values #'var.result #'rest #t)])))