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