(define-library (sx r7rs)
  (export
    make-error-object
    error-object?
    error-message
    error-object-irritants
    with-exception-handler
    car
    cdr
    cadr
    cddr
    caar
    cdar
    caddr
    cadddr
    null?
    pair?
    procedure?
    boolean=?
    symbol->string
    string->symbol
    number->string
    string->number)
  (begin

(define make-error-object (fn (message irritants) {:irritants irritants :type "error-object" :message message}))

(define
  error-object?
  (fn (x) (and (dict? x) (= (get x "type") "error-object"))))

(define
  error-message
  (fn (x) (if (error-object? x) (get x "message") (str x))))

(define
  error-object-irritants
  (fn (x) (if (error-object? x) (get x "irritants") (list))))

(defmacro
  with-exception-handler
  (handler thunk)
  (quasiquote
    (handler-bind (((fn (c) true) (unquote handler))) ((unquote thunk)))))

(define car first)

(define cdr rest)

(define cadr (fn (x) (first (rest x))))

(define cddr (fn (x) (rest (rest x))))

(define caar (fn (x) (first (first x))))

(define cdar (fn (x) (rest (first x))))

(define caddr (fn (x) (first (rest (rest x)))))

(define cadddr (fn (x) (first (rest (rest (rest x))))))

(define null? (fn (x) (or (nil? x) (and (list? x) (empty? x)))))

(define pair? (fn (x) (and (list? x) (not (empty? x)))))

(define procedure? (fn (x) (or (lambda? x) (callable? x))))

(define boolean=? (fn (a b) (= a b)))

(define symbol->string symbol-name)

(define string->symbol make-symbol)

(define number->string (fn (n) (str n)))

(define
  string->number
  (fn (s) (if (string-contains? s ".") (parse-float s) (parse-int s))))


)) ;; end define-library

;; Re-export to global namespace for backward compatibility
(import (sx r7rs))