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;; -*- mode: common-lisp -*-
#|
clasm-6502: An assembler for the 6502 written in Common Lisp.
Copyright (C) 2024 Aleksei Eaves
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
|#
;; Rules for interpreting the purpose of some line.
(setf
*grammar*
'(
(label
(lambda (l)
(and (eq (last-char (first l)) #\:)
(eq (length l) 1))))
(label-instruction
(lambda (l)
(and (eq (last-char (first l)) #\:)
(member (read-from-string (second l)) *opcodes*))))
(attribute
(lambda (l)
(equal (char (first l) 0) #\.)))
(instruction
(lambda (l)
(member (read-from-string (first l)) *opcodes*)))
(macro
(lambda (l)
(equal (second l) "=")))
(unknown
(lambda (l)
t))))
(defun syntax-rule (line list)
"Apply a syntax rule against a delimited line from a program."
(dolist (i (extract-keys list))
(let ((z (funcall (eval (cadr (assoc i list)))
line)))
(if (not (equal
z nil))
(return i)
nil))))
(syntax-rule '("LABEL:" "LDA" "$05") *grammar*)
(syntax-rule '("LDA" "$05") *grammar*)
(syntax-rule '("AS" "=" "THAT") *grammar*)
(syntax-rule '("LABEL:") *grammar*)
(syntax-rule '("hhhh") *grammar*)
(syntax-rule '(".org" "$FF00") *grammar*)
|
