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(import (gauche base)
(rfc json)
(scheme case-lambda)
(srfi 1)
(srfi 2))
(begin
(define (json-object . pairs)
(map (lambda (pair) (cons (symbol->string (car pair)) (cdr pair))) pairs))
(define json-list vector)
(define json-null 'null)
(define (json-object? obj)
(or (list? obj)
(json-record? obj)))
(define json-list? vector?)
(define (json-null? obj)
(eq? obj json-null))
(define (json-object-contains-key? obj key)
(or (and (list? obj)
(assoc (symbol->string key) obj)
#t)
(and (json-record? obj)
(json-object-contains-key? (json-record->fields obj) key))))
(define array-handler list->vector)
(define object-handler identity)
(define (special-handler x)
(case x
((true) #t)
((false) #f)
(else => identity)))
(define (string->json str)
(parameterize ((json-array-handler array-handler)
(json-object-handler object-handler)
(json-special-handler special-handler))
(parse-json-string str)))
(define (json->string obj)
(construct-json-string (json->typeless-json obj)))
(define (json-object-ref json key)
(cond
((list? json)
(let ((pair (assoc (symbol->string key) json)))
(if pair
(cdr pair)
((json-key-not-found)))))
((json-record? json)
(json-object-ref (json-record->fields json) key))
(else ((json-key-not-found)))))
(define (json-object-set! json key value)
(cond
((and (list? json)
(json-object-contains-key? json key))
(set-cdr! (assoc (symbol->string key) json) value)
json)
((null? json)
(error "json-object-set!: cannot set on an empty object" json))
((list? json)
(append! json (list (cons (symbol->string key) value))))
((json-record? json)
(or (and-let* ((pair (assoc key (json-record->mutators json)))
(mutator (cdr pair)))
(mutator json value)
json)
(error "json-object-set!: no mutator for field" (json-record->name json) key)))))
(define json-list-ref vector-ref)
(define json-list-length vector-length)
(define (json-object-map proc json)
(map (lambda (pair)
(call-with-values (lambda () (proc (string->symbol (car pair)) (cdr pair)))
(case-lambda
((key value) (cons (symbol->string key) value))
(_ (error "json-object-map: proc did not return two values")))))
json))
(define json-list-map vector-map)
(define (json-object->alist obj)
(cond
((list? obj)
(map (lambda (pair)
(cons (string->symbol (car pair))
(cdr pair)))
obj))
((json-record? obj) (json-object->alist (json->typeless-json obj)))
(else (error "json-object->alist: not an object" obj))))
(define json-list->list vector->list))
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