hackerbase/src/bank-account.scm

126 lines
3.3 KiB
Scheme

;;
;; bank-account.scm
;;
;; Generic bank account records.
;;
;; ISC License
;;
;; Copyright 2023 Brmlab, z.s.
;; Dominik Pantůček <dominik.pantucek@trustica.cz>
;;
;; Permission to use, copy, modify, and/or distribute this software
;; for any purpose with or without fee is hereby granted, provided
;; that the above copyright notice and this permission notice appear
;; in all copies.
;;
;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
;;
(declare (unit bank-account))
(module
bank-account
(
make-bank-account
bank-account-transactions
bank-account-number
bank-account-bank
bank-account-insert
make-bank-transaction
bank-transaction-varsym
bank-transaction-amount
bank-transaction-currency
bank-transaction-date
bank-transaction-id
bank-transaction-message
bank-transaction-type
bank-transaction-account
bank-transaction-bank
bank-transaction-specsym
bank-accounts-member?
)
(import scheme
(chicken base)
(chicken format)
util-tag)
;; Unique tag
(define TAG-BANK-TRANSACTION (make-tag bank-transaction))
;; Bank account is represented as a list with list with the following
;; elements: list of transactions, account number, bank code. This
;; allows cheap transaction prepending.
(define (make-bank-account number bank . maybe-transactions)
(let ((transactions (if (null? maybe-transactions)
'()
(car maybe-transactions))))
(list transactions number bank)))
;; Trivial accessors
(define bank-account-transactions car)
(define bank-account-number cadr)
(define bank-account-bank caddr)
;; Prepends given transaction to given bank account. It expects the
;; transactions list to be the first element of the bank account
;; list.
(define (bank-account-insert account transaction)
(cons (cons transaction (car account))
(cdr account)))
;; Creates new record
(define (make-bank-transaction . args)
(apply vector (cons TAG-BANK-TRANSACTION args)))
;; Defines one accessor
(define-syntax define-accessor
(syntax-rules ()
((_ num)
(void))
((_ num acc accs ...)
(begin
(define (acc t)
(vector-ref t num))
(define-accessor (add1 num) accs ...)))))
;; Defines all accessors
(define-syntax define-accessors
(syntax-rules ()
((_ accs ...)
(define-accessor 1 accs ...))))
;; Define accessors for bank-transaction
(define-accessors
bank-transaction-id
bank-transaction-date
bank-transaction-amount
bank-transaction-currency
bank-transaction-varsym
bank-transaction-message
bank-transaction-type
bank-transaction-account
bank-transaction-bank
bank-transaction-specsym)
;; Returns true if given acc/bc is in the list of accounts
(define (bank-accounts-member? bas acc bc)
(let loop ((bas bas))
(if (null? bas)
#f
(let ((ba (car bas)))
(if (and (equal? acc (bank-account-number ba))
(equal? bc (bank-account-bank ba)))
#t
(loop (cdr bas)))))))
)