/usr/share/minlog/src/lr-dvr.scm is in minlog 4.0.99.20100221-5.2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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;; ---------------------------------------------------------------------- ;;
;; FICHIER : lr-dvr.scm ;;
;; DATE DE CREATION : Fri May 31 15:47:05 1996 ;;
;; DERNIERE MODIFICATION : Fri May 31 15:51:13 1996 ;;
;; ---------------------------------------------------------------------- ;;
;; Copyright (c) 1996 Dominique Boucher ;;
;; ---------------------------------------------------------------------- ;;
;; The LR parser driver ;;
;; ;;
;; lr-dvr.scm is part of the lalr.scm distribution which 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 2, or (at your option) ;;
;; any later version. ;;
;; ;;
;; lalr.scm 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 lalr.scm; see the file COPYING. If not, write to ;;
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. ;;
;; ---------------------------------------------------------------------- ;;
(define max-stack-size 500)
(define lr-dvr-debug #f)
(define (push stack sp new-cat goto-table lval)
(let* ((state (vector-ref stack sp))
(new-state (cdr (assq new-cat (vector-ref goto-table state))))
(new-sp (+ sp 2)))
(if (>= new-sp max-stack-size)
(myerror "PARSE ERROR" "stack overflow")
(begin
(vector-set! stack new-sp new-state)
(vector-set! stack (- new-sp 1) lval)
new-sp))))
(define current-token "")
(define (make-parser action-table goto-table reduction-table token-defs)
(lambda (lexerp errorp)
(define (action x l)
(let ((y (assq x l)))
(if y
(cdr y)
(cdar l))))
(let ((stack (make-vector max-stack-size 0)))
(let loop ((sp 0) (input (lexerp)))
(let* ((state (vector-ref stack sp))
(i (car input))
(act (action i (vector-ref action-table state))))
(if lr-dvr-debug
(begin
(display "** PARSER TRACE:")
(display " input=")
(display input)
(display " i=")
(display (vector-ref token-defs i))
(display " state=")
(display state)
(display " sp=")
(display sp)
(newline)))
(cond
;Input successfully parsed
((eq? act 'accept)
(vector-ref stack 1))
;Syntax error in input
((eq? act '*error*)
(errorp "PARSE ERROR : unexpected token"
(string-append
(vector-ref token-defs i) " "
(if (string? (cdr input))
(cdr input) ""))
(lexerp #t))) ;cause the lexer to output current position
;Shift current token on top of the stack
((>= act 0)
(vector-set! stack (+ sp 1) (cdr input))
(vector-set! stack (+ sp 2) act)
(set! current-token CURRENT-INPUT)
(loop (+ sp 2) (lexerp)))
;Reduce by rule (- act)
(else
(loop ((vector-ref reduction-table (- act)) stack sp goto-table)
input))))))))
(define (token-string? string)
(let ((l (string->list string)))
(or (apply and-op (map char-alphabetic? l))
(apply and-op (map char-special? l)))))
(define (hashindex char-list hsize)
; Warning a copy of this function is in lalr.scm
; to insert predefined tokens into the hashtable
; either change both or neither
(let loop ((i 0) (l char-list))
(if (null? l)
(modulo i hsize)
(loop (+ (* i 7) (char->integer (car l))) (cdr l)))))
(define (make-add-token token-table token-nrs)
(let ((hsize (vector-length token-table)))
(lambda (string token value)
(let* ((token-nr (assoc token token-nrs))
(hindex (hashindex (string->list string) hsize))
(hlist (vector-ref token-table hindex)))
(cond ((not token-nr)
(myerror "Not a valid tokenclass for " string))
((not (token-string? string))
(myerror "Not a valid token string " string))
((assoc string hlist)
(myerror "Attempt to redefine token" string))
(else
(vector-set! token-table hindex
(cons
(cons string (cons (cdr token-nr) value))
hlist))))))))
(define (make-remove-token token-table token-nrs)
(letrec
((hsize (vector-length token-table))
(remove (lambda (list string)
(if (null? list)
(myerror "Attempt to remove a non-existing token" string)
(if (string=? string (caar list))
(cdr list)
(cons (car list) (remove (cdr list) string)))))))
(lambda (string)
(let ((hindex (hashindex (string->list string) hsize)))
(vector-set! token-table hindex
(remove (vector-ref token-table hindex) string))))))
(define (make-is-token? token-table token-defs)
(letrec
((hsize (vector-length token-table))
(info (lambda (list string)
(if (null? list)
#f
(if (string=? string (caar list))
(cons
(string->symbol (vector-ref token-defs (cadar list)))
(cddar list))
(info (cdr list) string))))))
(lambda (string)
(let ((hindex (hashindex (string->list string) hsize)))
(info (vector-ref token-table hindex) string)))))
(define (char-punctuation? c)
(or (char=? c #\( )
(char=? c #\) )
(char=? c #\[ )
(char=? c #\] )
(char=? c #\{ )
(char=? c #\} )
(char=? c #\. )
(char=? c #\; )
(char=? c #\, )
(char=? c #\" ) ))
(define (char-special? c)
(and (not (char-alphabetic? c))
(not (char-whitespace? c))
(not (char-punctuation? c))
(not (char-numeric? c))))
(define CURRENT-INPUT "")
(define (make-lexer token-table token-nrs)
(let ( (number-nr (cdr (assoc 'number token-nrs)))
(hat-nr (cdr (assoc 'hat token-nrs)))
(prime-nr (cdr (assoc 'prime token-nrs)))
(underscore-nr (cdr (assoc 'underscore token-nrs)))
(hatprime-nr (cdr (assoc 'hatprime token-nrs)))
(hatprimeunderscore-nr (cdr (assoc 'hatprimeunderscore token-nrs)))
(hatunderscore-nr (cdr (assoc 'hatunderscore token-nrs)))
(primeunderscore-nr (cdr (assoc 'primeunderscore token-nrs)))
(tvar-name-nr (cdr (assoc 'tvar-name token-nrs)))
(tconst-nr (cdr (assoc 'tconst token-nrs)))
(var-name-nr (cdr (assoc 'var-name token-nrs)))
(pvar-name-nr (cdr (assoc 'pvar-name token-nrs)))
(pvar-op-nr (cdr (assoc 'pvar-op token-nrs)))
(predconst-name-nr (cdr (assoc 'predconst-name token-nrs)))
(type-symbol-nr (cdr (assoc 'type-symbol token-nrs)))
(alg-nr (cdr (assoc 'alg token-nrs)))
(var-index-nr (cdr (assoc 'var-index token-nrs)))
(string-nr (cdr (assoc 'string token-nrs)))
(undefined-token-nr (cdr (assoc 'undefined-token token-nrs)))
)
(lambda (reader)
(letrec
((current (reader))
(previous-nr 0) ;contains the number of the previous token
;or 0 for whitespace
(next (lambda ()
(set! current (reader))))
(lex-number
(lambda (n)
(let ((m (+ (* 10 n) (- (char->integer current)
(char->integer #\0)))))
(begin
(next)
(if (and current (char-numeric? current))
(lex-number m)
m)))))
(lex-string
(lambda ()
(next)
(if current
(if (char=? current #\" )
(begin (next) '())
(if (char=? current #\\ )
(begin (next) (cons current (lex-string)))
(cons current (lex-string))))
'())))
(lex-symbol
(lambda ()
(let ((c current))
(if (and c (char-alphabetic? c))
(begin
(next)
(cons c (lex-symbol)))
'()))))
(lex-special
(lambda ()
(let ((c current))
(if (and c (char-special? c))
(begin
(next)
(cons c (lex-special)))
'()))))
(hsize (vector-length token-table))
(lex-lookup
(lambda (char-list)
(let* ((hindex (hashindex char-list hsize))
(hlist (vector-ref token-table hindex))
(token (list->string char-list))
(t (assoc token hlist)))
(set! CURRENT-INPUT token)
(if t
(cdr t)
(cons undefined-token-nr (list->string char-list))))))
(skip-comment
(lambda ()
(next)
(if (not (char=? current #\newline)) (skip-comment))))
(lexical-analyser
(lambda args
(if (null? args)
(let loop ()
(if current
(let ((token
(cond
((char-whitespace? current)
(set! previous-nr 0) (next) (loop))
((char-numeric? current)
(if (or (= previous-nr tvar-name-nr)
(= previous-nr tconst-nr)
(= previous-nr var-name-nr)
(= previous-nr pvar-name-nr)
(= previous-nr predconst-name-nr)
(= previous-nr type-symbol-nr)
(= previous-nr alg-nr)
(= previous-nr hat-nr)
(= previous-nr underscore-nr)
(= previous-nr prime-nr)
(= previous-nr hatprime-nr)
(= previous-nr hatprimeunderscore-nr)
(= previous-nr hatunderscore-nr)
(= previous-nr primeunderscore-nr)
(= previous-nr pvar-op-nr))
(cons var-index-nr (lex-number 0))
(cons number-nr (lex-number 0))))
((char=? current #\")
(cons string-nr (list->string (lex-string))))
((char-punctuation? current)
(let ((token (lex-lookup (list current))))
(next)
token))
((char-alphabetic? current)
(lex-lookup (lex-symbol)))
((char=? current #\/)
(next)
(if (char=? current #\/)
(begin
(set! previous-nr 0)
(skip-comment)
(loop))
(lex-lookup (cons #\/ (lex-special)))))
(else (lex-lookup (lex-special))))))
(set! previous-nr (car token))
token)
'(0))) ;end of input
(reader #t)))))
lexical-analyser))))
(define (lexer-info terminal-table token-nrs)
(define (insert l e) ;insert e = (string tokentype value)
(if (null? l) ;sorted by strings
(list e)
(if (string<? (car e) (caar l))
(cons e l)
(cons (car l) (insert (cdr l) e)))))
(let ((v (make-vector (length token-nrs) '())))
(do ((i 0 (+ i 1)))
((>= i (vector-length terminal-table)))
(do ((l (vector-ref terminal-table i) (cdr l)))
((null? l))
(vector-set! v (cadar l) (insert (vector-ref v (cadar l)) (car l)))))
(do ((i 0 (+ i 1))
(name token-nrs (cdr name)))
((>= i (vector-length v)))
(let ((l (vector-ref v i)))
(if (pair? l)
(begin
(display (caar name)) (newline)
(do ((tl l (cdr tl)))
((null? tl))
(display tab)
(display (caar tl))
(if (eq? 'var-name (caar name))
(begin
(display tab) (display ": ")
(display (if (caddar tl)
(type-to-string (caddar tl))))))
(if (eq? 'const (caar name))
(begin
(display tab) (display ": ")
(display (type-to-string (term-to-type (cddar tl))))))
(newline))))))))
(define (string-reader string)
(let ((pos 0)
(l (string-length string)))
(lambda args
(if (null? args)
(if (< pos l)
(let ((c (string-ref string pos)))
(set! pos (+ pos 1))
c)
#f)
;produce a string indicating current position
(if (> pos 20)
(string-append
(make-string 1 #\newline)
"..."
(substring string (- pos 17) (min (+ pos 20) l))
(make-string 1 #\newline)
(make-string 19 #\space)
"^")
(string-append
(make-string 1 #\newline)
(substring string 0 (min (+ pos 20) l))
(make-string 1 #\newline)
(make-string (if (zero? pos) pos (- pos 1))#\space)
"^"))))))
(define (port-reader filename port)
(let ((line 1)
(column 0))
(lambda args
(if (null? args)
(let ((c (read-char port)))
(if (eof-object? c)
#f
(if (char=? c #\newline)
(begin
(set! line (+ line 1))
(set! column 0)
c)
(begin
(set! column (+ column 1))
c))))
(string-append
(make-string 1 #\newline)
"; file: " filename
", line: " (number->string line)
", column: " (number->string (- column 1)))))))
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