Aryadev Chavali
dc94a396ec
Clean up the implementation of player-pay and player-receive by: - Single-clause early-error `if` for errors - use `incf`/`decf` instead of `setf`.
86 lines
2.5 KiB
Common Lisp
86 lines
2.5 KiB
Common Lisp
;;; player.lisp - 2025-02-15
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;; Copyright (C) 2025 Aryadev Chavali
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;; This program is distributed in the hope that it will be useful, but WITHOUT
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;; ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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;; FOR A PARTICULAR PURPOSE. See the GNU General Public License Version 2 for
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;; details.
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;; You may distribute and modify this code under the terms of the GNU General
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;; Public License Version 2, which you should have received a copy of along with
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;; this program. If not, please go to <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;; Player management - in particular, financing and hand management.
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;;; Code:
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(in-package :cantedraw.player)
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(defun playerp (x)
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(and (typep (car x) 'fixnum)
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(typep (cadr x) 'fixnum)
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(typep (caddr x) 'cardset)))
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(deftype player () `(and cons (satisfies playerp)))
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(deftype players () 'list)
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(define-condition error-player-nonexistent (error)
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((id :initarg :id :reader id))
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(:report
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(lambda (err stream)
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(format stream "Player [~a] is non-existent or malformed"
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(id err)))))
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(define-condition error-player-broke (error)
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((id :initarg :id :reader id)
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(balance :initarg :balance :reader balance)
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(required :initarg :required :reader required))
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(:report
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(lambda (err stream)
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(format stream "Player [~a] has balance $~a but $~a requested."
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(id err)
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(balance err)
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(required err)))))
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(fn player-id (player) (-> (player) fixnum)
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(car player))
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(fn player-balance (player) (-> (player) fixnum)
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(cadr player))
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(fn player-hand (player) (-> (player) cardset)
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(caddr player))
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(fn player-exists? (id players) (-> (fixnum players) boolean)
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(assoc id players))
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(fn player-bankrupt? (player) (-> (player) boolean)
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(<= (cadr player) 0))
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(fn player-can-bet? (min-bet player) (-> (fixnum player) boolean)
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(>= (cadr player) min-bet))
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(fn player-pay (id amount players) (-> (fixnum fixnum players) players)
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(let ((p (assoc id players)))
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(if (not (typep p 'player))
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(error 'error-player-nonexistent :id id))
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(if (not (player-can-bet? amount p))
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(error 'error-player-broke
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:id id
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:balance (player-balance p)
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:required amount))
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(decf (cadr (assoc id players)) amount))
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players)
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(fn player-receive (id amount players) (-> (fixnum fixnum players) players)
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(let ((p (assoc id players)))
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(if (not (typep p 'player))
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(error 'error-player-nonexistent :id id))
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(incf (cadr (assoc id players)) amount)
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players))
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