#| -*-Scheme-*-

Copyright (C) 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
    1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016,
    2017, 2018, 2019 Massachusetts Institute of Technology

This file is part of MIT/GNU Scheme.

MIT/GNU Scheme 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 of the License, or (at
your option) any later version.

MIT/GNU Scheme 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 MIT/GNU Scheme; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301,
USA.

|#

(define (test-matcher matcher string)
  (let ((buffer (string->parser-buffer string)))
    (and (matcher buffer)
	 (if (peek-parser-buffer-char buffer)
	     (get-parser-buffer-pointer buffer)
	     #t))))

(define (test-parser parser string)
  (let ((buffer (string->parser-buffer string)))
    (let ((v (parser buffer)))
      (and v
	   (if (peek-parser-buffer-char buffer)
	       (begin
		 (write-string "Lose: ")
		 (write (get-parser-buffer-pointer buffer))
		 (newline)
		 #f)
	       v)))))

(define parse-list
  (*parser
   (encapsulate vector->list
     (seq (noise (string "("))
	  (noise (* (char-set char-set:whitespace)))
	  (? (seq parse-element
		  (* (seq (noise (+ (char-set char-set:whitespace)))
			  parse-element))))
	  (noise (* (char-set char-set:whitespace)))
	  (noise (string ")"))))))

(define parse-element
  (*parser (alt parse-num-10 parse-identifier parse-list)))

(define parse-identifier
  (*parser (map intern (match match-identifier))))

(define parse-num-10
  (*parser (map string->number (match match-num-10))))

(define parse-whitespace
  (*parser (noise (+ (char-set char-set:whitespace)))))

(define parse-optional-whitespace
  (*parser (noise (* (char-set char-set:whitespace)))))

(define match-identifier
  (let* ((initial-char-set
	  (char-set-union char-set:alphabetic
			  (string->char-set "!$%&*/:<=>?^_~")))
	 (subsequent-char-set
	  (char-set-union initial-char-set
			  char-set:numeric
			  (string->char-set "+-.@"))))
    (*matcher
     (alt (seq (char-set initial-char-set)
	       (* (char-set subsequent-char-set)))
	  (string "+")
	  (string "-")
	  (string "...")))))

(define match-num-10
  (*matcher
   (seq (? (alt (seq (string-ci "#d")
		     (? (alt (string-ci "#i")
			     (string-ci "#e"))))
		(seq (alt (string-ci "#i")
			  (string-ci "#e"))
		     (? (string-ci "#d")))))
	match-complex-10)))

(define match-complex-10
  (*matcher
   (alt (seq match-ureal-10
	     (? (alt match-angle-10
		     match-imaginary-10)))
	(seq (char-set (string->char-set "+-"))
	     (alt (seq match-ureal-10
		       (? (alt match-angle-10
			       match-imaginary-10
			       (string-ci "i"))))
		  (string-ci "i"))))))

(define match-angle-10
  (*matcher
   (seq (string "@")
	(? (char-set (string->char-set "+-")))
	match-ureal-10)))

(define match-imaginary-10
  (*matcher
   (seq (char-set (string->char-set "+-"))
	(? match-ureal-10)
	(string-ci "i"))))

(define match-ureal-10
  (*matcher
   (alt (seq (+ (char-set char-set:numeric))
	     (? (alt (seq (string ".")
			  (* (char-set char-set:numeric))
			  (* (string "#"))
			  (? match-exponent-10))
		     (seq (string "/")
			  (+ (char-set char-set:numeric))
			  (* (string "#")))
		     (seq (+ (string "#"))
			  (? (alt (seq (string ".")
				       (* (string "#"))
				       (? match-exponent-10))
				  (seq (string "/")
				       (+ (char-set char-set:numeric))
				       (* (string "#")))
				  match-exponent-10)))
		     match-exponent-10)))
	(seq (string ".")
	     (+ (char-set char-set:numeric))
	     (* (string "#"))
	     (? match-exponent-10)))))

(define match-exponent-10
  (*matcher
   (seq (char-set (string->char-set "esfdlESFDL"))
	(? (char-set (string->char-set "+-")))
	(+ (char-set char-set:numeric)))))