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;; https://ktakashi.github.io/sections/section762.html
(import (text json)
(srfi 1)
(srfi 2)
(util vector)
(scheme case-lambda))
(begin
(define (json-object . pairs)
(let ((pairs (map (lambda (p) (cons (symbol->string (car p)) (cdr p))) pairs)))
(if (eq? (*json-map-type*) 'vector)
(apply vector pairs)
(apply list pairs))))
(define (json-list . objs)
(if (eq? (*json-map-type*) 'vector)
(apply list objs)
(apply vector objs)))
(define json-null 'null)
(define (json-object? json)
(or (json-record? json)
(if (eq? (*json-map-type*) 'vector)
(vector? json)
(list? json))))
(define (json-list? json)
(if (eq? (*json-map-type*) 'vector)
(list? json)
(vector? json)))
(define (json-null? obj)
(eq? obj json-null))
(define (json-object-contains-key? obj key)
(or (and ((if (eq? (*json-map-type*) 'vector) vector? list?) obj)
(assoc key (json-object->alist obj))
#t)
(and (json-record? obj)
(json-object-contains-key? (json-record->fields obj) key))))
(define (string->json str)
(call-with-port (open-input-string str)
(lambda (port)
(json-read port))))
(define (json->string json)
(call-with-port (open-output-string)
(lambda (port)
(json-write (json->typeless-json json) port)
(get-output-string port))))
(define (json-object-ref json key)
(cond
((and (not (json-record? json)) (json-object? json))
(let ((pair (assoc key (json-object->alist 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 (not (json-record? json))
(json-object? json)
(json-object-contains-key? json key))
(set-cdr! (if (eq? (*json-map-type*) 'vector)
(vector-find (lambda (pair) (eq? (string->symbol (car pair)) key)) json)
(assoc (symbol->string key) json))
value)
json)
((json-record? json)
(or (and-let* ((pair (assoc key (json-record->mutators json)))
(mutator (cdr pair)))
(set! json (mutator json value))
json)
(error "json-object-set!: no mutator for field" (json-record->name json) key)))))
(define (json-list-ref json index)
(list-ref (json-list->list json) index))
(define (json-list-length json)
(if (eq? (*json-map-type*) 'vector)
(length json)
(vector-length json)))
(define (json-object-map proc json)
((if (eq? (*json-map-type*) 'vector)
vector-map
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 proc json-list)
(if (eq? (*json-map-type*) 'vector)
(map proc json-list)
(vector-map proc json-list)))
(define (json-object->alist json)
(cond
((and (not (json-record? json)) (json-object? json))
(map (lambda (p) (cons (string->symbol (car p)) (cdr p)))
(if (eq? (*json-map-type*) 'vector)
(vector->list json)
json)))
((json-record? json) (json-object->alist (json->typeless-json obj)))
(else (error "json-object->alist: not an object" obj))))
(define (json-list->list json)
(if (eq? (*json-map-type*) 'vector)
json
(vector->list json))))
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