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@(define value (v))@\
@(cases)@\
@(string v)@(or)@(num v)@(or)@(object v)@(or)@\
@(keyword v)@(or)@(array v)@\
@(end)@\
@(end)
@(define ws)@/[\n\t ]*/@(end)
@(define string (g))@\
@(local s hex)@\
@(ws)@\
"@(coll :gap 0 :vars (s))@\
@(cases)@\
\"@(bind s """)@(or)@\
\\@(bind s "\\\\")@(or)@\
\/@(bind s "\\/")@(or)@\
\b@(bind s "")@(or)@\
\f@(bind s "")@(or)@\
\n@(bind s " ")@(or)@\
\r@(bind s " ")@(or)@\
\t@(bind s "	")@(or)@\
\u@{hex /[0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f]/}@\
@(bind s `&#x@hex;`)@(or)@\
@{s /[^"\\]*/}@(filter :to_html s)@\
@(end)@\
@(until)"@\
@(end)"@\
@(ws)@\
@(cat s "")@\
@(filter :from_html s)@\
@(bind g ("S" s))@\
@(end)
@(define num (v))@\
@(local n)@\
@(ws)@{n /-?[0-9]+((\.[0-9]+)?([Ee][+\-]?[0-9]+)?)?/}@(ws)@\
@(bind v ("N" n))@\
@(end)
@(define keyword (v))@\
@(local k)@\
@(all)@(ws)@{k /true|false|null/}@(trailer)@/[^A-Za-z0-9_]/@(end)@(ws)@\
@(bind v ("K" k))@\
@(end)
@(define object (v))@\
@(local p e pair)@\
@(ws){@(ws)@(coll :gap 0 :vars (pair))@\
@(string p):@(value e)@/,?/@\
@(bind pair (p e))@\
@(until)}@\
@(end)}@(ws)@\
@(bind v ("O" pair))@\
@(end)
@(define array (v))@\
@(local e)@\
@(ws)[@(ws)@(coll :gap 0 :var (e))@(value e)@/,?/@(until)]@(end)]@(ws)@\
@(bind v ("A" e))@\
@(end)
@(freeform)
@(maybe)@(value v)@(end)@badsyntax
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