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590 lines
16 KiB
EmacsLisp
590 lines
16 KiB
EmacsLisp
;;; ebnf-bnf.el --- parser for EBNF
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;; Copyright (C) 1999, 2000, 2001 Free Sofware Foundation, Inc.
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;; Author: Vinicius Jose Latorre <vinicius@cpqd.com.br>
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;; Maintainer: Vinicius Jose Latorre <vinicius@cpqd.com.br>
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;; Keywords: wp, ebnf, PostScript
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;; Time-stamp: <2001/09/24 10:17:26 vinicius>
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;; Version: 1.7
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software; you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation; either version 2, or (at your option)
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;; any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but 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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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs; see the file COPYING. If not, write to the
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;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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;; Boston, MA 02111-1307, USA.
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;;; Commentary:
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;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;
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;;
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;; This is part of ebnf2ps package.
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;;
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;; This package defines a parser for EBNF.
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;;
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;; See ebnf2ps.el for documentation.
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;;
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;;
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;; EBNF Syntax
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;; -----------
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;;
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;; The current EBNF that ebnf2ps accepts has the following constructions:
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;;
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;; ; comment (until end of line)
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;; A non-terminal
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;; "C" terminal
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;; ?C? special
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;; $A default non-terminal
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;; $"C" default terminal
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;; $?C? default special
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;; A = B. production (A is the header and B the body)
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;; C D sequence (C occurs before D)
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;; C | D alternative (C or D occurs)
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;; A - B exception (A excluding B, B without any non-terminal)
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;; n * A repetition (A repeats n (integer) times)
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;; (C) group (expression C is grouped together)
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;; [C] optional (C may or not occurs)
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;; C+ one or more occurrences of C
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;; {C}+ one or more occurrences of C
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;; {C}* zero or more occurrences of C
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;; {C} zero or more occurrences of C
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;; C / D equivalent to: C {D C}*
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;; {C || D}+ equivalent to: C {D C}*
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;; {C || D}* equivalent to: [C {D C}*]
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;; {C || D} equivalent to: [C {D C}*]
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;;
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;; The EBNF syntax written using the notation above is:
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;;
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;; EBNF = {production}+.
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;;
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;; production = non_terminal "=" body ".". ;; production
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;;
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;; body = {sequence || "|"}*. ;; alternative
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;;
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;; sequence = {exception}*. ;; sequence
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;;
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;; exception = repeat [ "-" repeat]. ;; exception
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;;
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;; repeat = [ integer "*" ] term. ;; repetition
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;;
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;; term = factor
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;; | [factor] "+" ;; one-or-more
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;; | [factor] "/" [factor] ;; one-or-more
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;; .
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;;
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;; factor = [ "$" ] "\"" terminal "\"" ;; terminal
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;; | [ "$" ] non_terminal ;; non-terminal
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;; | [ "$" ] "?" special "?" ;; special
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;; | "(" body ")" ;; group
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;; | "[" body "]" ;; zero-or-one
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;; | "{" body [ "||" body ] "}+" ;; one-or-more
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;; | "{" body [ "||" body ] "}*" ;; zero-or-more
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;; | "{" body [ "||" body ] "}" ;; zero-or-more
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;; .
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;;
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;; non_terminal = "[!#%&'*-,0-:<>@-Z\\\\^-z~\\240-\\377]+".
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;;
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;; terminal = "\\([^\"\\]\\|\\\\[ -~\\240-\\377]\\)+".
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;;
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;; special = "[^?\\n\\000-\\010\\016-\\037\\177-\\237]*".
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;;
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;; integer = "[0-9]+".
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;;
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;; comment = ";" "[^\\n\\000-\\010\\016-\\037\\177-\\237]*" "\\n".
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;;
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;;
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;; ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; Code:
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(require 'ebnf-otz)
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(defvar ebnf-bnf-lex nil
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"Value returned by `ebnf-bnf-lex' function.")
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Syntatic analyzer
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;;; EBNF = {production}+.
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(defun ebnf-bnf-parser (start)
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"EBNF parser."
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(let ((total (+ (- ebnf-limit start) 1))
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(bias (1- start))
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(origin (point))
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prod-list token rule)
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(goto-char start)
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(setq token (ebnf-bnf-lex))
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(and (eq token 'end-of-input)
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(error "Invalid EBNF file format"))
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(while (not (eq token 'end-of-input))
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(ebnf-message-float
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"Parsing...%s%%"
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(/ (* (- (point) bias) 100.0) total))
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(setq token (ebnf-production token)
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rule (cdr token)
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token (car token))
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(or (ebnf-add-empty-rule-list rule)
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(setq prod-list (cons rule prod-list))))
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(goto-char origin)
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prod-list))
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;;; production = non-terminal "=" body ".".
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(defun ebnf-production (token)
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(let ((header ebnf-bnf-lex)
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(action ebnf-action)
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body)
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(setq ebnf-action nil)
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(or (eq token 'non-terminal)
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(error "Invalid header production"))
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(or (eq (ebnf-bnf-lex) 'equal)
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(error "Invalid production: missing `='"))
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(setq body (ebnf-body))
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(or (eq (car body) 'period)
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(error "Invalid production: missing `.'"))
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(setq body (cdr body))
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(ebnf-eps-add-production header)
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(cons (ebnf-bnf-lex)
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(ebnf-make-production header body action))))
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;;; body = {sequence || "|"}*.
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(defun ebnf-body ()
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(let (body sequence)
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(while (eq (car (setq sequence (ebnf-sequence))) 'alternative)
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(setq sequence (cdr sequence)
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body (cons sequence body)))
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(ebnf-token-alternative body sequence)))
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;;; sequence = {exception}*.
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(defun ebnf-sequence ()
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(let ((token (ebnf-bnf-lex))
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seq term)
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(while (setq term (ebnf-exception token)
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token (car term)
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term (cdr term))
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(setq seq (cons term seq)))
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(cons token
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(cond
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;; null sequence
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((null seq)
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(ebnf-make-empty))
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;; sequence with only one element
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((= (length seq) 1)
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(car seq))
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;; a real sequence
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(t
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(ebnf-make-sequence (nreverse seq)))
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))))
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;;; exception = repeat [ "-" repeat].
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(defun ebnf-exception (token)
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(let ((term (ebnf-repeat token)))
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(if (not (eq (car term) 'except))
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;; repeat
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term
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;; repeat - repeat
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(let ((exception (ebnf-repeat (ebnf-bnf-lex))))
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(ebnf-no-non-terminal (cdr exception))
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(ebnf-token-except (cdr term) exception)))))
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(defun ebnf-no-non-terminal (node)
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(and (vectorp node)
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(let ((kind (ebnf-node-kind node)))
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(cond
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((eq kind 'ebnf-generate-non-terminal)
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(error "Exception sequence should not contain a non-terminal"))
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((eq kind 'ebnf-generate-repeat)
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(ebnf-no-non-terminal (ebnf-node-separator node)))
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((memq kind '(ebnf-generate-optional ebnf-generate-except))
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(ebnf-no-non-terminal (ebnf-node-list node)))
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((memq kind '(ebnf-generate-one-or-more ebnf-generate-zero-or-more))
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(ebnf-no-non-terminal (ebnf-node-list node))
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(ebnf-no-non-terminal (ebnf-node-separator node)))
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((memq kind '(ebnf-generate-alternative ebnf-generate-sequence))
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(let ((seq (ebnf-node-list node)))
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(while seq
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(ebnf-no-non-terminal (car seq))
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(setq seq (cdr seq)))))
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))))
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;;; repeat = [ integer "*" ] term.
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(defun ebnf-repeat (token)
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(if (not (eq token 'integer))
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(ebnf-term token)
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(let ((times ebnf-bnf-lex))
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(or (eq (ebnf-bnf-lex) 'repeat)
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(error "Missing `*'"))
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(ebnf-token-repeat times (ebnf-term (ebnf-bnf-lex))))))
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;;; term = factor
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;;; | [factor] "+" ;; one-or-more
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;;; | [factor] "/" [factor] ;; one-or-more
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;;; .
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(defun ebnf-term (token)
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(let ((factor (ebnf-factor token)))
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(and factor
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(setq token (ebnf-bnf-lex)))
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(cond
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;; [factor] +
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((eq token 'one-or-more)
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(cons (ebnf-bnf-lex)
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(and factor
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(let ((kind (ebnf-node-kind factor)))
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(cond
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;; { A }+ + ==> { A }+
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;; { A }* + ==> { A }*
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((memq kind '(ebnf-generate-zero-or-more
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ebnf-generate-one-or-more))
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factor)
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;; [ A ] + ==> { A }*
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((eq kind 'ebnf-generate-optional)
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(ebnf-make-zero-or-more (list factor)))
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;; A +
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(t
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(ebnf-make-one-or-more (list factor)))
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)))))
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;; [factor] / [factor]
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((eq token 'list)
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(setq token (ebnf-bnf-lex))
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(let ((sep (ebnf-factor token)))
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(and sep
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(setq factor (or factor (ebnf-make-empty))))
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(cons (if sep
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(ebnf-bnf-lex)
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token)
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(and factor
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(ebnf-make-one-or-more factor sep)))))
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;; factor
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(t
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(cons token factor))
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)))
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;;; factor = [ "$" ] "\"" terminal "\"" ;; terminal
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;;; | [ "$" ] non_terminal ;; non-terminal
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;;; | [ "$" ] "?" special "?" ;; special
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;;; | "(" body ")" ;; group
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;;; | "[" body "]" ;; zero-or-one
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;;; | "{" body [ "||" body ] "}+" ;; one-or-more
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;;; | "{" body [ "||" body ] "}*" ;; zero-or-more
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;;; | "{" body [ "||" body ] "}" ;; zero-or-more
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;;; .
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(defun ebnf-factor (token)
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(cond
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;; terminal
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((eq token 'terminal)
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(ebnf-make-terminal ebnf-bnf-lex))
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;; non-terminal
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((eq token 'non-terminal)
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(ebnf-make-non-terminal ebnf-bnf-lex))
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;; special
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((eq token 'special)
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(ebnf-make-special ebnf-bnf-lex))
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;; group
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((eq token 'begin-group)
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(let ((body (ebnf-body)))
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(or (eq (car body) 'end-group)
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(error "Missing `)'"))
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(cdr body)))
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;; optional
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((eq token 'begin-optional)
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(let ((body (ebnf-body)))
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(or (eq (car body) 'end-optional)
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(error "Missing `]'"))
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(ebnf-token-optional (cdr body))))
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;; list
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((eq token 'begin-list)
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(let* ((body (ebnf-body))
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(token (car body))
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(list-part (cdr body))
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sep-part)
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(and (eq token 'list-separator)
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;; { A || B }
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(setq body (ebnf-body) ; get separator
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token (car body)
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sep-part (cdr body)))
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(cond
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;; { A }+
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((eq token 'end-one-or-more)
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(ebnf-make-one-or-more list-part sep-part))
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;; { A }*
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((eq token 'end-zero-or-more)
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(ebnf-make-zero-or-more list-part sep-part))
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(t
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(error "Missing `}+', `}*' or `}'"))
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)))
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;; no term
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(t
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nil)
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))
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;; Lexical analyzer
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(defconst ebnf-bnf-token-table (make-vector 256 'error)
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"Vector used to map characters to a lexical token.")
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(defun ebnf-bnf-initialize ()
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"Initialize EBNF token table."
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;; control character & control 8-bit character are set to `error'
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(let ((char ?\040))
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;; printable character:
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(while (< char ?\060)
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(aset ebnf-bnf-token-table char 'non-terminal)
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(setq char (1+ char)))
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;; digits:
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(while (< char ?\072)
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(aset ebnf-bnf-token-table char 'integer)
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(setq char (1+ char)))
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;; printable character:
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(while (< char ?\177)
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(aset ebnf-bnf-token-table char 'non-terminal)
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(setq char (1+ char)))
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;; European 8-bit accentuated characters:
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(setq char ?\240)
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(while (< char ?\400)
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(aset ebnf-bnf-token-table char 'non-terminal)
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(setq char (1+ char)))
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;; Override space characters:
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(aset ebnf-bnf-token-table ?\013 'space) ; [VT] vertical tab
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(aset ebnf-bnf-token-table ?\n 'space) ; [NL] linefeed
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(aset ebnf-bnf-token-table ?\r 'space) ; [CR] carriage return
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(aset ebnf-bnf-token-table ?\t 'space) ; [HT] horizontal tab
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(aset ebnf-bnf-token-table ?\ 'space) ; [SP] space
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;; Override form feed character:
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(aset ebnf-bnf-token-table ?\f 'form-feed) ; [FF] form feed
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;; Override other lexical characters:
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(aset ebnf-bnf-token-table ?\" 'terminal)
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(aset ebnf-bnf-token-table ?\? 'special)
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(aset ebnf-bnf-token-table ?\( 'begin-group)
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(aset ebnf-bnf-token-table ?\) 'end-group)
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(aset ebnf-bnf-token-table ?* 'repeat)
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(aset ebnf-bnf-token-table ?- 'except)
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(aset ebnf-bnf-token-table ?= 'equal)
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(aset ebnf-bnf-token-table ?\[ 'begin-optional)
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(aset ebnf-bnf-token-table ?\] 'end-optional)
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(aset ebnf-bnf-token-table ?\{ 'begin-list)
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(aset ebnf-bnf-token-table ?| 'alternative)
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(aset ebnf-bnf-token-table ?\} 'end-list)
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(aset ebnf-bnf-token-table ?/ 'list)
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(aset ebnf-bnf-token-table ?+ 'one-or-more)
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(aset ebnf-bnf-token-table ?$ 'default)
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;; Override comment character:
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(aset ebnf-bnf-token-table ebnf-lex-comment-char 'comment)
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;; Override end of production character:
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(aset ebnf-bnf-token-table ebnf-lex-eop-char 'period)))
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;; replace the range "\240-\377" (see `ebnf-range-regexp').
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(defconst ebnf-bnf-non-terminal-chars
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(ebnf-range-regexp "!#%&'*-,0-:<>@-Z\\\\^-z~" ?\240 ?\377))
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(defun ebnf-bnf-lex ()
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"Lexical analyser for EBNF.
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Return a lexical token.
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See documentation for variable `ebnf-bnf-lex'."
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(if (>= (point) ebnf-limit)
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'end-of-input
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(let (token)
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;; skip spaces and comments
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(while (if (> (following-char) 255)
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(progn
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(setq token 'error)
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nil)
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(setq token (aref ebnf-bnf-token-table (following-char)))
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(cond
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((eq token 'space)
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(skip-chars-forward " \013\n\r\t" ebnf-limit)
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(< (point) ebnf-limit))
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((eq token 'comment)
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(ebnf-bnf-skip-comment))
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((eq token 'form-feed)
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(forward-char)
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(setq ebnf-action 'form-feed))
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(t nil)
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)))
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(setq ebnf-default-p nil)
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(cond
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;; end of input
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((>= (point) ebnf-limit)
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'end-of-input)
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;; error
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((eq token 'error)
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(error "Illegal character"))
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;; default
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((eq token 'default)
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(forward-char)
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(if (memq (aref ebnf-bnf-token-table (following-char))
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'(terminal non-terminal special))
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(prog1
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(ebnf-bnf-lex)
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(setq ebnf-default-p t))
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(error "Illegal `default' element")))
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;; integer
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((eq token 'integer)
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(setq ebnf-bnf-lex (ebnf-buffer-substring "0-9"))
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'integer)
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;; special: ?special?
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((eq token 'special)
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(setq ebnf-bnf-lex (concat "?"
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(ebnf-string " ->@-~" ?\? "special")
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"?"))
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'special)
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;; terminal: "string"
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((eq token 'terminal)
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(setq ebnf-bnf-lex (ebnf-unescape-string (ebnf-get-string)))
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'terminal)
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;; non-terminal or terminal
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((eq token 'non-terminal)
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(setq ebnf-bnf-lex (ebnf-buffer-substring ebnf-bnf-non-terminal-chars))
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(let ((case-fold-search ebnf-case-fold-search)
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match)
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(if (and ebnf-terminal-regexp
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(setq match (string-match ebnf-terminal-regexp
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ebnf-bnf-lex))
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(zerop match)
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(= (match-end 0) (length ebnf-bnf-lex)))
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'terminal
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'non-terminal)))
|
||
;; end of list: }+, }*, }
|
||
((eq token 'end-list)
|
||
(forward-char)
|
||
(cond
|
||
((= (following-char) ?+)
|
||
(forward-char)
|
||
'end-one-or-more)
|
||
((= (following-char) ?*)
|
||
(forward-char)
|
||
'end-zero-or-more)
|
||
(t
|
||
'end-zero-or-more)
|
||
))
|
||
;; alternative: |, ||
|
||
((eq token 'alternative)
|
||
(forward-char)
|
||
(if (/= (following-char) ?|)
|
||
'alternative
|
||
(forward-char)
|
||
'list-separator))
|
||
;; miscellaneous: {, (, ), [, ], ., =, /, +, -, *
|
||
(t
|
||
(forward-char)
|
||
token)
|
||
))))
|
||
|
||
|
||
;; replace the range "\177-\237" (see `ebnf-range-regexp').
|
||
(defconst ebnf-bnf-comment-chars
|
||
(ebnf-range-regexp "^\n\000-\010\016-\037" ?\177 ?\237))
|
||
|
||
|
||
(defun ebnf-bnf-skip-comment ()
|
||
(forward-char)
|
||
(cond
|
||
;; open EPS file
|
||
((and ebnf-eps-executing (= (following-char) ?\[))
|
||
(ebnf-eps-add-context (ebnf-bnf-eps-filename)))
|
||
;; close EPS file
|
||
((and ebnf-eps-executing (= (following-char) ?\]))
|
||
(ebnf-eps-remove-context (ebnf-bnf-eps-filename)))
|
||
;; any other action in comment
|
||
(t
|
||
(setq ebnf-action (aref ebnf-comment-table (following-char)))
|
||
(skip-chars-forward ebnf-bnf-comment-chars ebnf-limit))
|
||
)
|
||
;; check for a valid end of comment
|
||
(cond ((>= (point) ebnf-limit)
|
||
nil)
|
||
((= (following-char) ?\n)
|
||
(forward-char)
|
||
t)
|
||
(t
|
||
(error "Illegal character"))
|
||
))
|
||
|
||
|
||
(defun ebnf-bnf-eps-filename ()
|
||
(forward-char)
|
||
(ebnf-buffer-substring ebnf-bnf-comment-chars))
|
||
|
||
|
||
(defun ebnf-unescape-string (str)
|
||
(let* ((len (length str))
|
||
(size (1- len))
|
||
(istr 0)
|
||
(n-esc 0))
|
||
;; count number of escapes
|
||
(while (< istr size)
|
||
(setq istr (+ istr
|
||
(if (= (aref str istr) ?\\)
|
||
(progn
|
||
(setq n-esc (1+ n-esc))
|
||
2)
|
||
1))))
|
||
(if (zerop n-esc)
|
||
;; no escapes
|
||
str
|
||
;; at least one escape
|
||
(let ((new (make-string (- len n-esc) ?\ ))
|
||
(inew 0))
|
||
;; eliminate all escapes
|
||
(setq istr 0)
|
||
(while (> n-esc 0)
|
||
(and (= (aref str istr) ?\\)
|
||
(setq istr (1+ istr)
|
||
n-esc (1- n-esc)))
|
||
(aset new inew (aref str istr))
|
||
(setq inew (1+ inew)
|
||
istr (1+ istr)))
|
||
;; remaining string has no escape
|
||
(while (< istr len)
|
||
(aset new inew (aref str istr))
|
||
(setq inew (1+ inew)
|
||
istr (1+ istr)))
|
||
new))))
|
||
|
||
|
||
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
|
||
|
||
|
||
(provide 'ebnf-bnf)
|
||
|
||
|
||
;;; ebnf-bnf.el ends here
|