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add modules to syntax objects (part 1, intermediate step)

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* module/ice-9/psyntax.scm (make-syntax-object): As an intermediate step
  to adding modules to syntax objects, replace the definition of
  syntax-object as a structure with an expanded-out definition that has
  (1) a constructor that takes 2 or 3 arguments, and (2) a predicate that
  works with vectors of length 3 or 4. I couldn't just redefine
  make-syntax-object, for example, because these are internal
  definitions, and we can't have duplicate bindings in a letrec.
This commit is contained in:
Andy Wingo 2009-03-29 11:35:55 -07:00
parent 9d80c15649
commit 1641568c33
2 changed files with 31 additions and 12 deletions
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module/ice-9/psyntax-pp.scm
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module/ice-9/psyntax.scm
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@ -432,7 +432,26 @@
(syntax-rules ()
((_ src id) (build-annotated src (gensym (symbol->string id))))))
(define-structure (syntax-object expression wrap))
;; (define-structure (syntax-object expression wrap module))
(define (make-syntax-object exp wrap . mod)
(vector 'syntax-object exp wrap (if (null? mod) #f (car mod))))
(define (syntax-object? x)
(and (vector? x) (> (vector-length x) 0) (eq? (vector-ref x 0) 'syntax-object)))
(define (syntax-object-expression x)
(vector-ref x 1))
(define (syntax-object-wrap x)
(vector-ref x 2))
(define (syntax-object-module x)
(vector-ref x 3))
(define (set-syntax-object-expression! x y)
(vector-set! x 1 y))
(define (set-syntax-object-wrap! x y)
(vector-set! x 2 y))
(define (set-syntax-object-module! x y)
(vector-set! x 3 y))
(define-syntax unannotate
(syntax-rules ()