77 lines
2.3 KiB
Scheme
77 lines
2.3 KiB
Scheme
;;
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;; bank-account.scm
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;;
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;; Generic bank account records.
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;;
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;; ISC License
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;;
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;; Copyright 2023 Brmlab, z.s.
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;; Dominik Pantůček <dominik.pantucek@trustica.cz>
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;;
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;; Permission to use, copy, modify, and/or distribute this software
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;; for any purpose with or without fee is hereby granted, provided
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;; that the above copyright notice and this permission notice appear
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;; in all copies.
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;;
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;; THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL
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;; WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED
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;; WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE
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;; AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR
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;; CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS
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;; OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
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;; NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN
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;; CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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;;
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(declare (unit bank-account))
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(module
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bank-account
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(
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make-bank-account
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bank-account-transactions
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bank-account-number
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bank-account-bank
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bank-account-insert
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make-bank-transaction
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bank-transaction-varsym
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bank-transaction-amount
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bank-transaction-currency
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)
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(import scheme
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(chicken base))
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;; Bank account is represented as a list with list with the following
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;; elements: list of transactions, account number, bank code. This
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;; allows cheap transaction prepending.
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(define (make-bank-account number bank . maybe-transactions)
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(let ((transactions (if (null? maybe-transactions)
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'()
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(car maybe-transactions))))
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(list transactions number bank)))
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;; Trivial accessors
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(define bank-account-transactions car)
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(define bank-account-number cadr)
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(define bank-account-bank caddr)
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;; Prepends given transaction to given bank account. It expects the
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;; transactions list to be the first element of the bank account
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;; list.
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(define (bank-account-insert account transaction)
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(cons (cons transaction (car account))
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(cdr account)))
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;; Creates a new bank transaction. The order of elements is
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;; well-suited for fast access to commonly used fields.
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(define (make-bank-transaction id date amount currency varsym)
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(list varsym amount currency date id))
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;; Accessors for the fields actually used
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(define bank-transaction-varsym car)
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(define bank-transaction-amount cadr)
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(define bank-transaction-currency caddr)
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)
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