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# 01feb25 Software Lab. Alexander Burger
(de checkJson (X Item)
(unless (= X Item)
(quit "Bad JSON" Item) ) )
(de parseJson (Str Arr)
(let L (str Str "_")
(recur ()
(case (++ L)
("{"
(make
(for (X (recurse) (not (= "}" X)) (recurse))
(checkJson ":" (recurse))
(link (cons (intern X) (recurse)))
(T (= "}" (setq X (recurse))))
(checkJson "," X) ) ) )
("["
(make
(and Arr (link T)) # Array marker
(for (X (recurse) (not (= "]" X)) (recurse))
(link X)
(T (= "]" (setq X (recurse))))
(checkJson "," X) ) ) )
(T
(let X @
(cond
((pair X) (pack X))
((and (= "-" X) (format (car L)))
(- (++ L)) )
((and (num? X) (sub? (car L) "Ee"))
(and
(or (index "," (shift 'L)) (index "}" L))
(format (cut (dec @) 'L))
((if (lt0 @) */ *) X (** 10 (abs @))) ) )
(T X) ) ) ) ) ) ) )
(de readJson (Arr)
(case (read "_")
("{"
(make
(for (X (readJson Arr) (not (= "}" X)) (readJson Arr))
(checkJson ":" (readJson Arr))
(link (cons (intern X) (readJson Arr)))
(T (= "}" (setq X (readJson Arr))))
(checkJson "," X) ) ) )
("["
(make
(and Arr (link T)) # Array marker
(for (X (readJson Arr) (not (= "]" X)) (readJson Arr))
(link X)
(T (= "]" (setq X (readJson Arr))))
(checkJson "," X) ) ) )
(T
(let X @
(cond
((pair X) (pack X))
((and (= "-" X) (format (peek)))
(- (read)) )
((and (num? X) (sub? (peek) "Ee"))
(when (format (cdr (till ",}")))
((if (lt0 @) */ *) X (** 10 (abs @))) ) )
(T X) ) ) ) ) )
(de packJson (Item F)
(pack
(make
(recur (Item F)
(cond
((atom Item) (link (if Item (sym @) "{}")))
((=T (car Item))
(link "[")
(map
'((X)
(recurse (car X))
(and (cdr X) (link ", ")) )
(cdr Item) )
(link "]") )
((and (car Item) (atom @) (not F))
(link "\"" (sym (car Item)) "\": ")
(recurse (cdr Item) T) )
(T
(link "{")
(map
'((X)
(recurse (car X))
(and (cdr X) (link ", ")) )
Item )
(link "}") ) ) ) ) ) )
(de printJson (Item F)
(cond
((atom Item) (if Item (print @) (prin "{}")))
((=T (car Item))
(prin "[")
(map
'((X)
(printJson (car X))
(and (cdr X) (prin ", ")) )
(cdr Item) )
(prin "]") )
((and (car Item) (atom @) (not F))
(prin "\"")
(print (car Item))
(prin "\": ")
(printJson (cdr Item) T) )
(T
(prin "{")
(map
'((X)
(printJson (car X))
(and (cdr X) (prin ", ")) )
Item )
(prin "}") ) ) )
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