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(use-modules (ice-9 peg)
(ice-9 match))
(define-peg-pattern fff all
(and (* (or WHITESPACE NEWLINE))
(* (or comment
object
array
item
blanks))
(* NEWLINE)
(not-followed-by peg-any)))
(define-peg-pattern comment none
(and HASH (* WHITESPACE)
(* (and (not-followed-by NEWLINE)
peg-any))))
(define-peg-pattern object all
(and name
(+ object-item)))
(define-peg-pattern array all
(and name
(+ array-item)))
(define-peg-pattern item all
object-item)
(define-peg-pattern object-item body
(and key (* WHITESPACE)
COLON (* WHITESPACE)
(or ref val)))
(define-peg-pattern array-item body
(and (* WHITESPACE)
COLON (* WHITESPACE)
(or ref val)))
(define-peg-pattern name all
(and key COLON COLON (* WHITESPACE) NEWLINE))
(define-peg-pattern key body
(+ (and (not-followed-by COLON)
nonl)))
(define-peg-pattern val all
(and (* nonl)
NEWLINE))
(define-peg-pattern ref all
(and AT key NEWLINE))
(define-peg-pattern escaped body
(and BACKSLASH (or (and NEWLINE (* WHITESPACE))
peg-any)))
(define-peg-pattern blanks none
(+ NEWLINE))
(define-peg-pattern nonl body
(or escaped
(and (not-followed-by NEWLINE)
peg-any)))
(define-peg-pattern NEWLINE none
(or "\r\n" "\r" "\n"))
(define-peg-pattern WHITESPACE none
(or " " "\t"))
(define-peg-pattern BACKSLASH none "\\")
(define-peg-pattern COLON none ":")
(define-peg-pattern HASH none "#")
(define-peg-pattern AT none "@")
(define (ensure-nested-list x)
(if (list? (car x))
x
(list x)))
(define (atom? x)
(and (not (null? x))
(not (pair? x))))
(define (car-safe x)
(if (pair? x)
(car x)
#f))
(define (fff? x)
(and (pair? x)
(eq? (car x) 'fff)))
(define (fff->scm str)
(let ((tree (peg:tree (match-pattern fff str))))
(if (fff? tree)
(fff-ref-resolve (fff-tree->ref-tree tree))
#f)))
(define (fff-tree->ref-tree tree)
(let loop ((xs (cdr tree))
(it '()))
(if (null? xs)
(reverse it)
(loop (cdr xs)
(match (car xs)
(`(object (name ,name) ,pairs)
(cons (cons name
(map fff-pair->scm
(ensure-nested-list pairs)))
it))
(`(array (name ,name) ,values)
(cons (cons name
(list->vector (map fff-value->scm
(ensure-nested-list values))))
it))
(`(item . ,pair)
(cons (fff-pair->scm pair)
it))
(_ it))))))
(define* (fff-ref-resolve tree #:optional environment keep-dupes?)
(define dupes '())
(define env (append (or environment '())
'(("true" . #t)
("false" . #f)
("null" . null))))
(filter (lambda (x)
(if keep-dupes?
#t
(not (member (or (car-safe x) x)
dupes))))
(let loop ((xs tree)
(v? #f)
(it '()))
(if (null? xs)
((if v? list->vector identity)
(reverse it))
(begin
(loop (cdr xs)
v?
(cons (let ((x (car xs)))
(cond
((atom? x)
(set! env (cons x env))
x)
((procedure? (cdr x))
(set! dupes (cons (car x) dupes))
(let ((res
(cons (car x)
((cdr x) (append env tree)))))
(set! env (cons res env))
res))
((atom? (cdr x))
(set! env (cons x env))
x)
((vector? (cdr x))
(let ((vl (vector->list (cdr x))))
(set! env (cons (fff-ref-resolve vl env #t)
env))
(cons (car x)
(loop vl #t '()))))
(else ; object
(set! env (cons (fff-ref-resolve x env #t)
env))
(cons (car x) ; not tail-recursive!
(loop (cdr x) #f '())))))
it)))))))
(define (fff-pair->scm pair)
(cons (car pair) (fff-value->scm (cadr pair))))
(define (fff-value->scm val)
(match val
(`(val ,v) v)
(`(ref ,r) (lambda (alist)
(assoc-ref alist r)))))
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