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;;; Guile-ACL2 --- Guile's ACL2 compiler
;;; Copyright © 2021 Masaya Tojo <masaya@tojo.tokyo>
;;;
;;; This file is part of Guile-ACL2.
;;;
;;; Guile-ACL2 is free software; you can redistribute it and/or modify
;;; it under the terms of the GNU Lesser General Public License as
;;; published by the Free Software Foundation; either version 3 of the
;;; License, or (at your option) any later version.
;;;
;;; Guile-ACL2 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
;;; Lesser General Public License for more details.
;;;
;;; You should have received a copy of the GNU Lesser General Public
;;; License along with Guile-ACL2. If not, see
;;; <http://www.gnu.org/licenses/>.
(define-module (language acl2 lexer)
#:use-module (ice-9 control)
#:use-module (srfi srfi-8)
#:use-module (srfi srfi-9)
#:use-module (srfi srfi-14)
#:export (lexer))
(define char-set:acl2 char-set:ascii)
(define char-set:acl2-digit
(char-set-intersection char-set:acl2 char-set:digit))
(define char-set:acl2-letter
(char-set-intersection char-set:acl2 char-set:letter))
(define char-set:acl2-whitespace
(char-set-intersection char-set:acl2 char-set:whitespace))
(define char-set:acl2-paren-open
(char-set #\())
(define char-set:acl2-paren-close
(char-set #\)))
(define char-set:acl2-quote
(char-set #\'))
(define char-set:acl2-quasiquote
(char-set #\`))
(define char-set:acl2-unquote
(char-set #\,))
(define char-set:acl2-double-quote
(char-set #\"))
(define char-set:acl2-separator
(char-set-union char-set:acl2-whitespace
char-set:acl2-paren-open
char-set:acl2-paren-close
char-set:acl2-quote
char-set:acl2-double-quote
char-set:acl2-quasiquote
char-set:acl2-unquote))
(define char-set:acl2-dot
(char-set #\.))
(define char-set:acl2-escape
(char-set #\\))
(define (skip-whitespaces p)
(let ((c (peek-char p)))
(cond
((char-set-contains? char-set:acl2-whitespace c)
(read-char p)
(skip-whitespaces p))
(else
(lex p)))))
(define (next v f)
(shift k (values v
(lambda ()
(reset (f) (k #f))))))
(define (set-acl2-source-properties! p obj)
(let ((out (open-output-string)))
(set-source-property! obj 'filename (if (file-port? p)
(port-filename p)
#f))
(set-source-property! obj 'line (1+ (port-line p)))
(set-source-property! obj 'column (1+ (port-column p)))))
(define (open-output-string-source p)
(let ((out (open-output-string)))
(set-acl2-source-properties! p out)
out))
(define (token-source p token-symbol)
(let ((token (cons token-symbol #f)))
(set-acl2-source-properties! p token)
token))
(define* (lex-numeric-or-symbol p #:optional (out (open-output-string-source p)))
(let ((c (peek-char p)))
(cond
((or (eof-object? c)
(char-set-contains? char-set:acl2-separator c))
(next (cons-source out '<number> (get-output-string out))
(lambda () (lex p))))
((char-set-contains? char-set:digit c)
(write-char (read-char p) out)
(lex-numeric-or-symbol p out))
(else
(lex-symbol p out)))))
(define* (lex-symbol p #:optional (out (open-output-string-source p)))
(let ((c (peek-char p)))
(cond
((or (eof-object? c)
(char-set-contains? char-set:acl2-separator c))
(next (cons-source out '<symbol> (get-output-string out))
(lambda () (lex p))))
((char-set-contains? char-set:acl2-escape c)
(read-char p)
(let ((c2 (peek-char p)))
(unless (eof-object? c2)
(write-char (read-char p) out))
(lex-symbol p out)))
(else
(write-char (read-char p) out)
(lex-symbol p out)))))
(define* (lex-string p #:optional (out (open-output-string-source p)))
(let ((c (peek-char p)))
(cond
((eof-object? c)
(next (cons-source out '<string> (get-output-string out))
(lambda () (lex p))))
((char-set-contains? char-set:acl2-double-quote c)
(display (read-char p))
(newline)
(next (cons-source out '<string> (get-output-string out))
(lambda () (lex p))))
((char-set-contains? char-set:acl2-escape c)
(read-char p)
(let ((c2 (peek-char p)))
(unless (eof-object? c2)
(write-char (read-char p) out))
(lex-string p out)))
(else
(write-char (read-char p) out)
(lex-string p out)))))
(define (lex p)
(let ((c (peek-char p)))
(cond
((eof-object? c)
(next (token-source p '<eof>)
(lambda () (lex p))))
((char-set-contains? char-set:acl2-whitespace c)
(skip-whitespaces p))
((char-set-contains? char-set:acl2-digit c)
(lex-numeric-or-symbol p))
((char-set-contains? char-set:acl2-double-quote c)
(read-char p)
(lex-string p))
((char-set-contains? char-set:acl2-paren-open c)
(next (token-source p '<paren-open>)
(lambda () (read-char p) (lex p))))
((char-set-contains? char-set:acl2-paren-close c)
(next (token-source p '<paren-close>)
(lambda () (read-char p) (lex p))))
((char-set-contains? char-set:acl2-quote c)
(next (token-source p '<quote>)
(lambda () (read-char p) (lex p))))
((char-set-contains? char-set:acl2-quasiquote c)
(next (token-source p '<quasiquote>)
(lambda () (read-char p) (lex p))))
((char-set-contains? char-set:acl2-unquote c)
(next (token-source p '<unquote>)
(lambda () (read-char p) (lex p))))
((char-set-contains? char-set:acl2-dot c)
(read-char)
(let ((c2 (peek-char c)))
(if (char-set-contains? char-set:acl2-separator c2)
(next (token-source p '<dot>)
(lambda () (lex p)))
(let ((out (open-output-string-source p)))
(write-char c out)
(lex-symbol p out)))))
(else (lex-symbol p)))))
(define (lexer p)
(lambda () (reset (lex p))))
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