90 lines
2.6 KiB
Scheme
Executable File
90 lines
2.6 KiB
Scheme
Executable File
#! /bin/sh
|
|
# -*-scheme-*-
|
|
export GUILE_AUTO_COMPILE=0
|
|
exec ${GUILE-guile} -L $(pwd)/guile -e '(nyacc)' -s "$0" "$@"
|
|
!#
|
|
|
|
;;; Mes --- The Maxwell Equations of Software
|
|
;;; Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
|
|
;;;
|
|
;;; This file is part of GNU Guix.
|
|
;;;
|
|
;;; Mes is free software; you can redistribute it and/or modify it
|
|
;;; under the terms of the GNU General Public License as published by
|
|
;;; the Free Software Foundation; either version 3 of the License, or (at
|
|
;;; your option) any later version.
|
|
;;;
|
|
;;; Mes 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 General Public License for more details.
|
|
;;;
|
|
;;; You should have received a copy of the GNU General Public License
|
|
;;; along with Mes. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
;; The Maxwell Equations of Software -- John McCarthy page 13
|
|
;; http://www.softwarepreservation.org/projects/LISP/book/LISP%201.5%20Programmers%20Manual.pdf
|
|
|
|
#!
|
|
Run with Guile-1.8:
|
|
GUILE='~/src/guile-1.8/build/pre-inst-guile --debug -q' guile/nyacc.scm
|
|
!#
|
|
|
|
;; Tcalc.scm - calculator
|
|
;;
|
|
;; Copyright (C) 2015 Matthew R. Wette
|
|
;;
|
|
;; Copying and distribution of this file, with or without modification,
|
|
;; are permitted in any medium without royalty provided the copyright
|
|
;; notice and this notice are preserved. This file is offered as-is,
|
|
;; without any warranty.
|
|
|
|
(cond-expand
|
|
(guile-2)
|
|
(guile
|
|
(use-modules (ice-9 syncase))
|
|
(use-modules (ice-9 optargs))))
|
|
|
|
(define-module (nyacc)
|
|
#:use-module (nyacc lalr)
|
|
#:use-module (nyacc lex)
|
|
#:use-module (nyacc parse)
|
|
#:use-module (ice-9 rdelim)
|
|
#:use-module (ice-9 pretty-print)
|
|
#:export (main))
|
|
|
|
(define simple-spec
|
|
(lalr-spec
|
|
(prec< (left "+" "-") (left "*" "/"))
|
|
(start expr)
|
|
(grammar
|
|
(expr
|
|
(expr "+" expr ($$ (+ $1 $3)))
|
|
(expr "-" expr ($$ (- $1 $3)))
|
|
(expr "*" expr ($$ (* $1 $3)))
|
|
(expr "/" expr ($$ (/ $1 $3)))
|
|
("*" $error)
|
|
($fixed ($$ (string->number $1)))
|
|
($float ($$ (string->number $1)))
|
|
("(" expr ")" ($$ $2))))))
|
|
|
|
(define simple-mach (make-lalr-machine simple-spec))
|
|
;; OR
|
|
;; (use-modules (nyacc bison))
|
|
;; (define simple-mach (make-lalr-machine/bison simple-spec))
|
|
|
|
(define match-table (assq-ref simple-mach 'mtab))
|
|
|
|
(define gen-lexer (make-lexer-generator match-table))
|
|
|
|
(define parse (make-lalr-parser simple-mach))
|
|
|
|
(define demo-string "2 + 2")
|
|
|
|
(define (main arguments)
|
|
(display demo-string)
|
|
(display " => ")
|
|
(display (with-input-from-string demo-string
|
|
(lambda () (parse (gen-lexer)))))
|
|
(newline))
|