1205 lines
44 KiB
Scheme
1205 lines
44 KiB
Scheme
;;; Ikarus Scheme -- A compiler for R6RS Scheme.
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;;; Copyright (C) 2006,2007,2008 Abdulaziz Ghuloum
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;;;
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;;; This program is free software: you can redistribute it and/or modify
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;;; it under the terms of the GNU General Public License version 3 as
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;;; published by the Free Software Foundation.
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;;;
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;;; This program 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 GNU
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;;; 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 this program. If not, see <http://www.gnu.org/licenses/>.
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(library (ikarus.reader)
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(export read read-initial read-token comment-handler get-datum
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read-annotated read-script-annotated annotation?
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annotation-expression annotation-source
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annotation-stripped)
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(import
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(only (ikarus.string-to-number) define-string->number-parser)
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(ikarus system $chars)
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(ikarus system $fx)
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(ikarus system $pairs)
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(ikarus system $bytevectors)
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(only (ikarus.io) input-port-byte-position)
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(except (ikarus) read-char read read-token comment-handler get-datum
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read-annotated read-script-annotated annotation?
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annotation-expression annotation-source annotation-stripped))
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(define (die/lex id pos who msg arg*)
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(raise
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(condition
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(make-lexical-violation)
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(make-message-condition msg)
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(if (null? arg*)
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(condition)
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(make-irritants-condition arg*))
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(make-source-position-condition
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id pos))))
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(define (die/pos p off who msg arg*)
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(die/lex (port-id p)
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(let ([pos (input-port-byte-position p)])
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(and pos (+ pos off)))
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who msg arg*))
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(define (die/p p who msg . arg*)
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(die/pos p 0 who msg arg*))
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(define (die/p-1 p who msg . arg*)
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(die/pos p -1 who msg arg*))
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(define (die/ann ann who msg . arg*)
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(let ([src (annotation-source ann)])
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(die/lex (car src) (cdr src) who msg arg*)))
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(define (checked-integer->char n ac p)
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(define (valid-integer-char? n)
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(cond
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[(<= n #xD7FF) #t]
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[(< n #xE000) #f]
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[(<= n #x10FFFF) #t]
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[else #f]))
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(if (valid-integer-char? n)
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($fixnum->char n)
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(die/p p 'tokenize
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"invalid numeric value for character"
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(list->string (reverse ac)))))
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(define-syntax read-char
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(syntax-rules ()
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[(_ p) (get-char p)]))
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(define delimiter?
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(lambda (c)
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(or (char-whitespace? c)
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(memq c '(#\( #\) #\[ #\] #\" #\# #\;)))))
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(define digit?
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(lambda (c)
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(and ($char<= #\0 c) ($char<= c #\9))))
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(define char->num
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(lambda (c)
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(fx- ($char->fixnum c) ($char->fixnum #\0))))
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(define initial?
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(lambda (c)
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(cond
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[($char<= c ($fixnum->char 127))
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(or (letter? c) (special-initial? c))]
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[else (unicode-printable-char? c)])))
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(define letter?
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(lambda (c)
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(or (and ($char<= #\a c) ($char<= c #\z))
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(and ($char<= #\A c) ($char<= c #\Z)))))
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(define special-initial?
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(lambda (c)
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(memq c '(#\! #\$ #\% #\& #\* #\/ #\: #\< #\= #\> #\? #\^ #\_ #\~))))
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(define special-subsequent?
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(lambda (c)
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(memq c '(#\+ #\- #\. #\@))))
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(define subsequent?
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(lambda (c)
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(cond
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[($char<= c ($fixnum->char 127))
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(or (letter? c)
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(digit? c)
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(special-initial? c)
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(special-subsequent? c))]
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[else
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(or (unicode-printable-char? c)
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(memq (char-general-category c) '(Nd Mc Me)))])))
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(define tokenize-identifier
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(lambda (ls p)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c) ls]
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[(subsequent? c)
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(read-char p)
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(tokenize-identifier (cons c ls) p)]
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[(delimiter? c)
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ls]
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[(char=? c #\\)
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(read-char p)
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(tokenize-backslash ls p)]
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[(char=? c #\}) ls]
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[else
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(die/p p 'tokenize "invalid identifier syntax"
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(list->string (reverse (cons c ls))))]))))
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(define (tokenize-string ls p)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside string")]
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[else (tokenize-string-char ls p c)])))
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(define (tokenize-string-char ls p c)
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(define (intraline-whitespace? c)
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(or (eqv? c #\x9)
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(eq? (char-general-category c) 'Zs)))
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(define (tokenize-string-continue ls p c)
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside string")]
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[(intraline-whitespace? c)
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(let f ()
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside string")]
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[(intraline-whitespace? c) (f)]
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[else (tokenize-string-char ls p c)])))]
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[else (tokenize-string-char ls p c)]))
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(cond
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[($char= #\" c) ls]
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[($char= #\\ c)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof after string escape")]
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[($char= #\a c) (tokenize-string (cons #\x7 ls) p)]
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[($char= #\b c) (tokenize-string (cons #\x8 ls) p)]
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[($char= #\t c) (tokenize-string (cons #\x9 ls) p)]
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[($char= #\n c) (tokenize-string (cons #\xA ls) p)]
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[($char= #\v c) (tokenize-string (cons #\xB ls) p)]
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[($char= #\f c) (tokenize-string (cons #\xC ls) p)]
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[($char= #\r c) (tokenize-string (cons #\xD ls) p)]
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[($char= #\" c) (tokenize-string (cons #\x22 ls) p)]
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[($char= #\\ c) (tokenize-string (cons #\x5C ls) p)]
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[($char= #\x c) ;;; unicode escape \xXXX;
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside string")]
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[(hex c) =>
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(lambda (n)
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(let f ([n n] [ac (cons c '(#\x))])
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(let ([c (read-char p)])
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(cond
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[(eof-object? n)
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(die/p p 'tokenize "invalid eof inside string")]
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[(hex c) =>
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(lambda (v) (f (+ (* n 16) v) (cons c ac)))]
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[($char= c #\;)
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(tokenize-string
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(cons (checked-integer->char n ac p) ls) p)]
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[else
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(die/p-1 p 'tokenize
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"invalid char in escape sequence"
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(list->string (reverse (cons c ac))))]))))]
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[else
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(die/p-1 p 'tokenize
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"invalid char in escape sequence" c)]))]
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[(intraline-whitespace? c)
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(let f ()
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside string")]
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[(intraline-whitespace? c) (f)]
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[(memv c '(#\xA #\x85 #\x2028))
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(tokenize-string-continue ls p (read-char p))]
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[(memv c '(#\xD))
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(let ([c (read-char p)])
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(cond
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[(memv c '(#\xA #\x85))
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(tokenize-string-continue ls p (read-char p))]
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[else
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(tokenize-string-continue ls p c)]))]
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[else
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(die/p-1 p 'tokenize
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"non-whitespace character after escape")])))]
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[(memv c '(#\xA #\x85 #\x2028))
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(tokenize-string-continue ls p (read-char p))]
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[(memv c '(#\xD))
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(let ([c (read-char p)])
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(cond
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[(memv c '(#\xA #\x85))
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(tokenize-string-continue ls p (read-char p))]
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[else
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(tokenize-string-continue ls p c)]))]
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[else (die/p-1 p 'tokenize "invalid string escape" c)]))]
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[(memv c '(#\xA #\x85 #\x2028))
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(tokenize-string (cons #\linefeed ls) p)]
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[(memv c '(#\xD))
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(let ([c (peek-char p)])
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(when (memv c '(#\xA #\x85))
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(read-char p))
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(tokenize-string (cons #\linefeed ls) p))]
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[else
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(tokenize-string (cons c ls) p)]))
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(define skip-comment
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(lambda (p)
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(let ([c (read-char p)])
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(unless (eof-object? c)
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(let ([i ($char->fixnum c)])
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(unless (or (fx= i 10) (fx= i 13))
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(skip-comment p)))))))
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(define tokenize-dot
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(lambda (p)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c) 'dot]
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[(delimiter? c) 'dot]
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[($char= c #\.) ; this is second dot
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(read-char p)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid syntax .. near end of file")]
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[($char= c #\.) ; this is the third
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(read-char p)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c) '(datum . ...)]
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[(delimiter? c) '(datum . ...)]
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[else
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(die/p p 'tokenize "invalid syntax"
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(string-append "..." (string c)))]))]
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[else
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(die/p p 'tokenize "invalid syntax"
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(string-append ".." (string c)))]))]
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[else
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(cons 'datum
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(dot p '(#\.) 10 #f +1))]))))
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(define tokenize-char*
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(lambda (i str p d)
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(cond
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[(fx= i (string-length str))
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c) d]
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[(delimiter? c) d]
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[else (die/p p 'tokenize "invalid character after sequence"
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(string-append str (string c)))]))]
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[else
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof in the middle of expected sequence" str)]
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[($char= c (string-ref str i))
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(tokenize-char* (fxadd1 i) str p d)]
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[else
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(die/p-1 p 'tokenize
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"invalid char while scanning string"
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c str)]))])))
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(define tokenize-char-seq
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(lambda (p str d)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c) (cons 'datum (string-ref str 0))]
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[(delimiter? c) (cons 'datum (string-ref str 0))]
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[($char= (string-ref str 1) c)
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(read-char p)
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(tokenize-char* 2 str p d)]
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[else (die/p p 'tokenize "invalid syntax"
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(string-ref str 0) c)]))))
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(define tokenize-char
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(lambda (p)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid #\\ near end of file")]
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[(eqv? #\n c)
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c)
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(read-char p)
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'(datum . #\n)]
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[(eqv? #\u c)
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(read-char p)
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(tokenize-char-seq p "ul" '(datum . #\x0))]
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[(eqv? #\e c)
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(read-char p)
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(tokenize-char-seq p "ewline" '(datum . #\xA))]
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[(delimiter? c)
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'(datum . #\n)]
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[else
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(die/p p 'tokenize "invalid syntax"
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(string #\# #\\ #\n c))]))]
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[(eqv? #\a c)
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(tokenize-char-seq p "alarm" '(datum . #\x7))]
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[(eqv? #\b c)
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(tokenize-char-seq p "backspace" '(datum . #\x8))]
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[(eqv? #\t c)
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(tokenize-char-seq p "tab" '(datum . #\x9))]
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[(eqv? #\l c)
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(tokenize-char-seq p "linefeed" '(datum . #\xA))]
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[(eqv? #\v c)
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(tokenize-char-seq p "vtab" '(datum . #\xB))]
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[(eqv? #\p c)
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(tokenize-char-seq p "page" '(datum . #\xC))]
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[(eqv? #\r c)
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(tokenize-char-seq p "return" '(datum . #\xD))]
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[(eqv? #\e c)
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(tokenize-char-seq p "esc" '(datum . #\x1B))]
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[(eqv? #\s c)
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(tokenize-char-seq p "space" '(datum . #\x20))]
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[(eqv? #\d c)
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(tokenize-char-seq p "delete" '(datum . #\x7F))]
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[(eqv? #\x c)
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(let ([n (peek-char p)])
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(cond
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[(or (eof-object? n) (delimiter? n))
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'(datum . #\x)]
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[(hex n) =>
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(lambda (v)
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(read-char p)
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(let f ([v v] [ac (cons n '(#\x))])
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(let ([c (peek-char p)])
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(cond
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[(eof-object? c)
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(cons 'datum (checked-integer->char v ac p))]
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[(delimiter? c)
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(cons 'datum (checked-integer->char v ac p))]
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[(hex c) =>
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(lambda (v0)
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(read-char p)
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(f (+ (* v 16) v0) (cons c ac)))]
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[else
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(die/p p 'tokenize
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"invalid character sequence"
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(list->string (reverse (cons c ac))))]))))]
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[else
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(die/p p 'tokenize "invalid character sequence"
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(string-append "#\\" (string n)))]))]
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[else
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(let ([n (peek-char p)])
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(cond
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[(eof-object? n) (cons 'datum c)]
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[(delimiter? n) (cons 'datum c)]
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[else
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(die/p p 'tokenize "invalid syntax"
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(string-append "#\\" (string c n)))]))]))))
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(define (hex x)
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(cond
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[(and ($char<= #\0 x) ($char<= x #\9))
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($fx- ($char->fixnum x) ($char->fixnum #\0))]
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[(and ($char<= #\a x) ($char<= x #\f))
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($fx- ($char->fixnum x)
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($fx- ($char->fixnum #\a) 10))]
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[(and ($char<= #\A x) ($char<= x #\F))
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($fx- ($char->fixnum x)
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($fx- ($char->fixnum #\A) 10))]
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[else #f]))
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(define multiline-error
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(lambda (p)
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(die/p p 'tokenize
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"end of file encountered while inside a #|-style comment")))
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(define apprev
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(lambda (str i ac)
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(cond
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[(fx= i (string-length str)) ac]
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[else
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(apprev str (fx+ i 1) (cons (string-ref str i) ac))])))
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(define multiline-comment
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(lambda (p)
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(define f
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(lambda (p ac)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c) (multiline-error p)]
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[($char= #\| c)
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(let g ([c (read-char p)] [ac ac])
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(cond
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[(eof-object? c) (multiline-error p)]
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[($char= #\# c) ac]
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[($char= #\| c)
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(g (read-char p) (cons c ac))]
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[else (f p (cons c ac))]))]
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[($char= #\# c)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c) (multiline-error p)]
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[($char= #\| c)
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(let ([v (multiline-comment p)])
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(if (string? v)
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(f p (apprev v 0 ac))
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(f p ac)))]
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[else
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(f p (cons c (cons #\# ac)))]))]
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[else (f p (cons c ac))]))))
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(let ([ac (f p '())])
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((comment-handler)
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(list->string (reverse ac))))))
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(define tokenize-hash
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(lambda (p)
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(tokenize-hash/c (read-char p) p)))
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(define (skip-whitespace p caller)
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(let ([c (read-char p)])
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(cond
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[(eof-object? c)
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(die/p p 'tokenize "invalid eof inside" caller)]
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[(char-whitespace? c)
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(skip-whitespace p caller)]
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[else c])))
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(define tokenize-hash/c
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(lambda (c p)
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(cond
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[(eof-object? c) (die/p p 'tokenize "invalid # near end of file")]
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[(memq c '(#\t #\T))
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(let ([c1 (peek-char p)])
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(cond
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[(eof-object? c1) '(datum . #t)]
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[(delimiter? c1) '(datum . #t)]
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[else (die/p p 'tokenize
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(format "invalid syntax near #~a~a" c c1))]))]
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[(memq c '(#\f #\F))
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(let ([c1 (peek-char p)])
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(cond
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[(eof-object? c1) '(datum . #f)]
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[(delimiter? c1) '(datum . #f)]
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[else (die/p p 'tokenize
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(format "invalid syntax near #~a~a" c c1))]))]
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[($char= #\\ c) (tokenize-char p)]
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[($char= #\( c) 'vparen]
|
|
[($char= #\' c) '(macro . syntax)]
|
|
[($char= #\` c) '(macro . quasisyntax)]
|
|
[($char= #\, c)
|
|
(let ([c (peek-char p)])
|
|
(cond
|
|
[(eqv? c #\@) (read-char p)
|
|
'(macro . unsyntax-splicing)]
|
|
[else '(macro . unsyntax)]))]
|
|
[($char= #\! c)
|
|
(let ([e (read-char p)])
|
|
(when (eof-object? e)
|
|
(die/p p 'tokenize "invalid eof near #!"))
|
|
(case e
|
|
[(#\e)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die/p-1 p 'tokenize "invalid syntax: #!e"))
|
|
(read-char* p '(#\e) "of" "eof sequence" #f #f)
|
|
(cons 'datum (eof-object))]
|
|
[(#\r)
|
|
(read-char* p '(#\r) "6rs" "#!r6rs comment" #f #f)
|
|
(set-port-mode! p 'r6rs-mode)
|
|
(tokenize/1 p)]
|
|
[(#\i)
|
|
(read-char* p '(#\i) "karus" "#!ikarus comment" #f #f)
|
|
(set-port-mode! p 'ikarus-mode)
|
|
(tokenize/1 p)]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
(format "invalid syntax near #!~a" e))]))]
|
|
[(digit? c)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die/p-1 p 'tokenize "graph syntax is invalid in #!r6rs mode"
|
|
(format "#~a" c)))
|
|
(tokenize-hashnum p (char->num c))]
|
|
[($char= #\: c)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die/p-1 p 'tokenize "gensym syntax is invalid in #!r6rs mode"
|
|
(format "#~a" c)))
|
|
(let* ([c (skip-whitespace p "gensym")]
|
|
[id0
|
|
(cond
|
|
[(initial? c)
|
|
(list->string
|
|
(reverse (tokenize-identifier (cons c '()) p)))]
|
|
[($char= #\| c)
|
|
(list->string
|
|
(reverse (tokenize-bar p '())))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
"invalid char inside gensym" c)])])
|
|
(cons 'datum (gensym id0)))]
|
|
[($char= #\{ c)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die/p-1 p 'tokenize "gensym syntax is invalid in #!r6rs mode"
|
|
(format "#~a" c)))
|
|
(let* ([c (skip-whitespace p "gensym")]
|
|
[id0
|
|
(cond
|
|
[(initial? c)
|
|
(list->string
|
|
(reverse (tokenize-identifier (cons c '()) p)))]
|
|
[($char= #\| c)
|
|
(list->string
|
|
(reverse (tokenize-bar p '())))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
"invalid char inside gensym" c)])]
|
|
[c (skip-whitespace p "gensym")])
|
|
(cond
|
|
[($char= #\} c)
|
|
(cons 'datum
|
|
(foreign-call "ikrt_strings_to_gensym" #f id0))]
|
|
[else
|
|
(let ([id1
|
|
(cond
|
|
[(initial? c)
|
|
(list->string
|
|
(reverse
|
|
(tokenize-identifier
|
|
(cons c '()) p)))]
|
|
[($char= #\| c)
|
|
(list->string
|
|
(reverse (tokenize-bar p '())))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
"invalid char inside gensym" c)])])
|
|
(let ([c (skip-whitespace p "gensym")])
|
|
(cond
|
|
[($char= #\} c)
|
|
(cons 'datum
|
|
(foreign-call "ikrt_strings_to_gensym"
|
|
id0 id1))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
"invalid char inside gensym" c)])))]))]
|
|
[($char= #\v c)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[($char= #\u c)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[($char= c #\8)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[($char= c #\() 'vu8]
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof object after #vu8")]
|
|
[else (die/p-1 p 'tokenize
|
|
(format "invalid sequence #vu8~a" c))]))]
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof object after #vu")]
|
|
[else (die/p-1 p 'tokenize
|
|
(format "invalid sequence #vu~a" c))]))]
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof object after #v")]
|
|
[else (die/p p 'tokenize
|
|
(format "invalid sequence #v~a" c))]))]
|
|
[(memq c '(#\e #\E))
|
|
(cons 'datum (parse-string p (list c #\#) 10 #f 'e))]
|
|
[(memq c '(#\i #\I))
|
|
(cons 'datum (parse-string p (list c #\#) 10 #f 'i))]
|
|
[(memq c '(#\b #\B))
|
|
(cons 'datum (parse-string p (list c #\#) 2 2 #f))]
|
|
[(memq c '(#\x #\X))
|
|
(cons 'datum (parse-string p (list c #\#) 16 16 #f))]
|
|
[(memq c '(#\o #\O))
|
|
(cons 'datum (parse-string p (list c #\#) 8 8 #f))]
|
|
[(memq c '(#\d #\D))
|
|
(cons 'datum (parse-string p (list c #\#) 10 10 #f))]
|
|
[($char= #\@ c)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die/p-1 p 'tokenize "fasl syntax is invalid in #!r6rs mode"
|
|
(format "#~a" c)))
|
|
(die/p-1 p 'read "FIXME: fasl read disabled")
|
|
'(cons 'datum ($fasl-read p))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
(format "invalid syntax #~a" c))])))
|
|
|
|
(define (num-error p str ls)
|
|
(die/p-1 p 'read str
|
|
(list->string (reverse ls))))
|
|
|
|
(define-syntax port-config
|
|
(syntax-rules (GEN-TEST GEN-ARGS FAIL EOF-ERROR GEN-DELIM-TEST)
|
|
[(_ GEN-ARGS k . rest) (k (p ac) . rest)]
|
|
[(_ FAIL (p ac))
|
|
(num-error p "invalid numeric sequence" ac)]
|
|
[(_ FAIL (p ac) c)
|
|
(num-error p "invalid numeric sequence" (cons c ac))]
|
|
[(_ EOF-ERROR (p ac))
|
|
(num-error p "invalid eof while reading number" ac)]
|
|
[(_ GEN-DELIM-TEST c sk fk)
|
|
(if (delimiter? c) sk fk)]
|
|
[(_ GEN-TEST var next fail (p ac) eof-case char-case)
|
|
(let ([c (peek-char p)])
|
|
(if (eof-object? c)
|
|
(let ()
|
|
(define-syntax fail
|
|
(syntax-rules ()
|
|
[(_) (num-error p "invalid numeric sequence" ac)]))
|
|
eof-case)
|
|
(let ([var c])
|
|
(define-syntax fail
|
|
(syntax-rules ()
|
|
[(_)
|
|
(num-error p "invalid numeric sequence"
|
|
(cons var ac))]))
|
|
(define-syntax next
|
|
(syntax-rules ()
|
|
[(_ who args (... ...))
|
|
(who p (cons (get-char p) ac) args (... ...))]))
|
|
char-case)))]))
|
|
|
|
(define-string->number-parser port-config
|
|
(parse-string digit+ sign dot))
|
|
|
|
(define (read-char* p ls str who ci? delimited?)
|
|
(let f ([i 0] [ls ls])
|
|
(cond
|
|
[(fx= i (string-length str))
|
|
(when delimited?
|
|
(let ([c (peek-char p)])
|
|
(when (and (not (eof-object? c)) (not (delimiter? c)))
|
|
(die/p p 'tokenize
|
|
(format "invalid ~a: ~s" who
|
|
(list->string (reverse (cons c ls))))))))]
|
|
[else
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize
|
|
(format "invalid eof inside ~a" who))]
|
|
[(or (and (not ci?) (char=? c (string-ref str i)))
|
|
(and ci? (char=? (char-downcase c) (string-ref str i))))
|
|
(f (add1 i) (cons c ls))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
(format "invalid ~a: ~s" who
|
|
(list->string (reverse (cons c ls)))))]))])))
|
|
(define (tokenize-hashnum p n)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof inside #n mark/ref")]
|
|
[($char= #\= c) (cons 'mark n)]
|
|
[($char= #\# c) (cons 'ref n)]
|
|
[(digit? c)
|
|
(tokenize-hashnum p (fx+ (fx* n 10) (char->num c)))]
|
|
[else
|
|
(die/p-1 p 'tokenize "invalid char while inside a #n mark/ref" c)])))
|
|
(define tokenize-bar
|
|
(lambda (p ac)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "unexpected eof while reading symbol")]
|
|
[($char= #\\ c)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "unexpected eof while reading symbol")]
|
|
[else (tokenize-bar p (cons c ac))]))]
|
|
[($char= #\| c) ac]
|
|
[else (tokenize-bar p (cons c ac))]))))
|
|
(define (tokenize-backslash main-ac p)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after symbol escape")]
|
|
[($char= #\x c)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after \\x")]
|
|
[(hex c) =>
|
|
(lambda (v)
|
|
(let f ([v v] [ac `(,c #\x #\\)])
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize
|
|
(format "invalid eof after ~a"
|
|
(list->string (reverse ac))))]
|
|
[($char= #\; c)
|
|
(tokenize-identifier
|
|
(cons (checked-integer->char v ac p) main-ac)
|
|
p)]
|
|
[(hex c) =>
|
|
(lambda (v0)
|
|
(f (+ (* v 16) v0) (cons c ac)))]
|
|
[else
|
|
(die/p-1 p 'tokenize "invalid sequence"
|
|
(list->string (cons c (reverse ac))))]))))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
(format "invalid sequence \\x~a" c))]))]
|
|
[else
|
|
(die/p-1 p 'tokenize
|
|
(format "invalid sequence \\~a" c))])))
|
|
(define tokenize/c
|
|
(lambda (c p)
|
|
(cond
|
|
[(eof-object? c)
|
|
(error 'tokenize/c "hmmmm eof")
|
|
(eof-object)]
|
|
[($char= #\( c) 'lparen]
|
|
[($char= #\) c) 'rparen]
|
|
[($char= #\[ c) 'lbrack]
|
|
[($char= #\] c) 'rbrack]
|
|
[($char= #\' c) '(macro . quote)]
|
|
[($char= #\` c) '(macro . quasiquote)]
|
|
[($char= #\, c)
|
|
(let ([c (peek-char p)])
|
|
(cond
|
|
[(eof-object? c) '(macro . unquote)]
|
|
[($char= c #\@)
|
|
(read-char p)
|
|
'(macro . unquote-splicing)]
|
|
[else '(macro . unquote)]))]
|
|
[($char= #\# c) (tokenize-hash p)]
|
|
[(char<=? #\0 c #\9)
|
|
(let ([d (fx- (char->integer c) (char->integer #\0))])
|
|
(cons 'datum
|
|
(digit+ p (list c) 10 #f +1 d)))]
|
|
[(initial? c)
|
|
(let ([ls (reverse (tokenize-identifier (cons c '()) p))])
|
|
(cons 'datum (string->symbol (list->string ls))))]
|
|
[($char= #\" c)
|
|
(let ([ls (tokenize-string '() p)])
|
|
(cons 'datum (list->string (reverse ls))))]
|
|
[(memq c '(#\+))
|
|
(let ([c (peek-char p)])
|
|
(cond
|
|
[(eof-object? c) '(datum . +)]
|
|
[(delimiter? c) '(datum . +)]
|
|
[else
|
|
(cons 'datum
|
|
(sign p '(#\+) 10 #f +1))]))]
|
|
[(memq c '(#\-))
|
|
(let ([c (peek-char p)])
|
|
(cond
|
|
[(eof-object? c) '(datum . -)]
|
|
[(delimiter? c) '(datum . -)]
|
|
[($char= c #\>)
|
|
(read-char p)
|
|
(let ([ls (tokenize-identifier '() p)])
|
|
(let ([str (list->string (cons* #\- #\> (reverse ls)))])
|
|
(cons 'datum (string->symbol str))))]
|
|
[else
|
|
(cons 'datum
|
|
(sign p '(#\-) 10 #f -1))]))]
|
|
[($char= #\. c)
|
|
(tokenize-dot p)]
|
|
[($char= #\| c)
|
|
(when (eq? (port-mode p) 'r6rs-mode)
|
|
(die 'tokenize "|symbol| syntax is invalid in #!r6rs mode"))
|
|
(let ([ls (reverse (tokenize-bar p '()))])
|
|
(cons 'datum (string->symbol (list->string ls))))]
|
|
[($char= #\\ c)
|
|
(cons 'datum
|
|
(string->symbol
|
|
(list->string
|
|
(reverse (tokenize-backslash '() p)))))]
|
|
[else
|
|
(die/p-1 p 'tokenize "invalid syntax" c)])))
|
|
|
|
(define tokenize/1
|
|
(lambda (p)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c) (eof-object)]
|
|
[(eqv? c #\;)
|
|
(skip-comment p)
|
|
(tokenize/1 p)]
|
|
[(eqv? c #\#)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after #")]
|
|
[(eqv? c #\;)
|
|
(read-as-comment p)
|
|
(tokenize/1 p)]
|
|
[(eqv? c #\|)
|
|
(multiline-comment p)
|
|
(tokenize/1 p)]
|
|
[else
|
|
(tokenize-hash/c c p)]))]
|
|
[(char-whitespace? c) (tokenize/1 p)]
|
|
[else (tokenize/c c p)]))))
|
|
|
|
(define tokenize/1+pos
|
|
(lambda (p)
|
|
(let ([pos (input-port-byte-position p)])
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c) (values (eof-object) pos)]
|
|
[(eqv? c #\;)
|
|
(skip-comment p)
|
|
(tokenize/1+pos p)]
|
|
[(eqv? c #\#)
|
|
(let ([pos (input-port-byte-position p)])
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after #")]
|
|
[(eqv? c #\;)
|
|
(read-as-comment p)
|
|
(tokenize/1+pos p)]
|
|
[(eqv? c #\|)
|
|
(multiline-comment p)
|
|
(tokenize/1+pos p)]
|
|
[else
|
|
(values (tokenize-hash/c c p) pos)])))]
|
|
[(char-whitespace? c) (tokenize/1+pos p)]
|
|
[else
|
|
(values (tokenize/c c p) pos)])))))
|
|
|
|
(define tokenize-script-initial
|
|
(lambda (p)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c) c]
|
|
[(eqv? c #\;)
|
|
(skip-comment p)
|
|
(tokenize/1 p)]
|
|
[(eqv? c #\#)
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after #")]
|
|
[(eqv? c #\!)
|
|
(skip-comment p)
|
|
(tokenize/1 p)]
|
|
[(eqv? c #\;)
|
|
(read-as-comment p)
|
|
(tokenize/1 p)]
|
|
[(eqv? c #\|)
|
|
(multiline-comment p)
|
|
(tokenize/1 p)]
|
|
[else
|
|
(tokenize-hash/c c p)]))]
|
|
[(char-whitespace? c) (tokenize/1 p)]
|
|
[else (tokenize/c c p)]))))
|
|
|
|
(define tokenize-script-initial+pos
|
|
(lambda (p)
|
|
(let ([pos (input-port-byte-position p)])
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c) (values (eof-object) pos)]
|
|
[(eqv? c #\;)
|
|
(skip-comment p)
|
|
(tokenize/1+pos p)]
|
|
[(eqv? c #\#)
|
|
(let ([pos (input-port-byte-position p)])
|
|
(let ([c (read-char p)])
|
|
(cond
|
|
[(eof-object? c)
|
|
(die/p p 'tokenize "invalid eof after #")]
|
|
[(eqv? c #\!)
|
|
(skip-comment p)
|
|
(tokenize/1+pos p)]
|
|
[(eqv? c #\;)
|
|
(read-as-comment p)
|
|
(tokenize/1+pos p)]
|
|
[(eqv? c #\|)
|
|
(multiline-comment p)
|
|
(tokenize/1+pos p)]
|
|
[else
|
|
(values (tokenize-hash/c c p) pos)])))]
|
|
[(char-whitespace? c) (tokenize/1+pos p)]
|
|
[else (values (tokenize/c c p) pos)])))))
|
|
|
|
(define-struct loc (value value^ set?))
|
|
|
|
;;; this is reverse engineered from psyntax.ss
|
|
(define-struct annotation (expression source stripped))
|
|
;;; - source is a pair of file-name x char-position
|
|
;;; - stripped is an s-expression with no annotations
|
|
;;; - expression is a list/vector/id/whathaveyou that
|
|
;;; may contain further annotations.
|
|
|
|
|
|
(module (read-expr read-expr-script-initial)
|
|
(define-syntax tokenize/1 syntax-error)
|
|
(define (annotate-simple datum pos p)
|
|
(make-annotation datum (cons (port-id p) pos) datum))
|
|
(define (annotate stripped expression pos p)
|
|
(make-annotation expression (cons (port-id p) pos) stripped))
|
|
(define read-list
|
|
(lambda (p locs k end mis init?)
|
|
(let-values ([(t pos) (tokenize/1+pos p)])
|
|
(cond
|
|
[(eof-object? t)
|
|
(die/p p 'read "end of file encountered while reading list")]
|
|
[(eq? t end) (values '() '() locs k)]
|
|
[(eq? t mis)
|
|
(die/p-1 p 'read "paren mismatch")]
|
|
[(eq? t 'dot)
|
|
(when init?
|
|
(die/p-1 p 'read "invalid dot while reading list"))
|
|
(let-values ([(d d^ locs k) (read-expr p locs k)])
|
|
(let-values ([(t pos^) (tokenize/1+pos p)])
|
|
(cond
|
|
[(eq? t end) (values d d^ locs k)]
|
|
[(eq? t mis)
|
|
(die/p-1 p 'read "paren mismatch")]
|
|
[(eq? t 'dot)
|
|
(die/p-1 p 'read "cannot have two dots in a list")]
|
|
[else
|
|
(die/p-1 p 'read
|
|
(format "expecting ~a, got ~a" end t))])))]
|
|
[else
|
|
(let-values ([(a a^ locs k) (parse-token p locs k t pos)])
|
|
(let-values ([(d d^ locs k) (read-list p locs k end mis #f)])
|
|
(let ([x (cons a d)] [x^ (cons a^ d^)])
|
|
(values x x^ locs (extend-k-pair x x^ a d k)))))]))))
|
|
(define extend-k-pair
|
|
(lambda (x x^ a d k)
|
|
(cond
|
|
[(or (loc? a) (loc? d))
|
|
(lambda ()
|
|
(let ([a (car x)])
|
|
(when (loc? a)
|
|
(set-car! x (loc-value a))
|
|
(set-car! x^ (loc-value^ a))))
|
|
(let ([d (cdr x)])
|
|
(when (loc? d)
|
|
(set-cdr! x (loc-value d))
|
|
(set-cdr! x^ (loc-value^ d))))
|
|
(k))]
|
|
[else k])))
|
|
(define vector-put
|
|
(lambda (v v^ k i ls ls^)
|
|
(cond
|
|
[(null? ls) k]
|
|
[else
|
|
(let ([a (car ls)])
|
|
(vector-set! v i a)
|
|
(vector-set! v^ i (car ls^))
|
|
(vector-put v v^
|
|
(if (loc? a)
|
|
(lambda ()
|
|
(vector-set! v i (loc-value a))
|
|
(vector-set! v^ i (loc-value^ a))
|
|
(k))
|
|
k)
|
|
(fxsub1 i)
|
|
(cdr ls)
|
|
(cdr ls^)))])))
|
|
(define read-vector
|
|
(lambda (p locs k count ls ls^)
|
|
(let-values ([(t pos) (tokenize/1+pos p)])
|
|
(cond
|
|
[(eof-object? t)
|
|
(die/p p 'read "end of file encountered while reading a vector")]
|
|
[(eq? t 'rparen)
|
|
(let ([v (make-vector count)] [v^ (make-vector count)])
|
|
(let ([k (vector-put v v^ k (fxsub1 count) ls ls^)])
|
|
(values v v^ locs k)))]
|
|
[(eq? t 'rbrack)
|
|
(die/p-1 p 'read "unexpected ] while reading a vector")]
|
|
[(eq? t 'dot)
|
|
(die/p-1 p 'read "unexpected . while reading a vector")]
|
|
[else
|
|
(let-values ([(a a^ locs k) (parse-token p locs k t pos)])
|
|
(read-vector p locs k (fxadd1 count)
|
|
(cons a ls) (cons a^ ls^)))]))))
|
|
(define read-bytevector
|
|
(lambda (p locs k count ls)
|
|
(let-values ([(t pos) (tokenize/1+pos p)])
|
|
(cond
|
|
[(eof-object? t)
|
|
(die/p p 'read "end of file encountered while reading a bytevector")]
|
|
[(eq? t 'rparen)
|
|
(let ([v (u8-list->bytevector (reverse ls))])
|
|
(values v v locs k))]
|
|
[(eq? t 'rbrack)
|
|
(die/p-1 p 'read "unexpected ] while reading a bytevector")]
|
|
[(eq? t 'dot)
|
|
(die/p-1 p 'read "unexpected . while reading a bytevector")]
|
|
[else
|
|
(let-values ([(a a^ locs k) (parse-token p locs k t pos)])
|
|
(unless (and (fixnum? a) (fx<= 0 a) (fx<= a 255))
|
|
(die/ann a^ 'read
|
|
"invalid value in a bytevector" a))
|
|
(read-bytevector p locs k (fxadd1 count)
|
|
(cons a ls)))]))))
|
|
(define parse-token
|
|
(lambda (p locs k t pos)
|
|
(cond
|
|
[(eof-object? t)
|
|
(values (eof-object)
|
|
(annotate-simple (eof-object) pos p) locs k)]
|
|
[(eq? t 'lparen)
|
|
(let-values ([(ls ls^ locs k)
|
|
(read-list p locs k 'rparen 'rbrack #t)])
|
|
(values ls (annotate ls ls^ pos p) locs k))]
|
|
[(eq? t 'lbrack)
|
|
(let-values ([(ls ls^ locs k)
|
|
(read-list p locs k 'rbrack 'rparen #t)])
|
|
(values ls (annotate ls ls^ pos p) locs k))]
|
|
[(eq? t 'vparen)
|
|
(let-values ([(v v^ locs k)
|
|
(read-vector p locs k 0 '() '())])
|
|
(values v (annotate v v^ pos p) locs k))]
|
|
[(eq? t 'vu8)
|
|
(let-values ([(v v^ locs k)
|
|
(read-bytevector p locs k 0 '())])
|
|
(values v (annotate v v^ pos p) locs k))]
|
|
[(pair? t)
|
|
(cond
|
|
[(eq? (car t) 'datum)
|
|
(values (cdr t)
|
|
(annotate-simple (cdr t) pos p) locs k)]
|
|
[(eq? (car t) 'macro)
|
|
(let ([macro (cdr t)])
|
|
(define (read-macro)
|
|
(let-values ([(t pos) (tokenize/1+pos p)])
|
|
(cond
|
|
[(eof-object? t)
|
|
(die/p p 'read
|
|
(format "invalid eof after ~a read macro"
|
|
macro))]
|
|
[else (parse-token p locs k t pos)])))
|
|
(let-values ([(expr expr^ locs k) (read-macro)])
|
|
(let ([d (list expr)] [d^ (list expr^)])
|
|
(let ([x (cons macro d)]
|
|
[x^ (cons (annotate-simple macro pos p) d^)])
|
|
(values x (annotate x x^ pos p) locs
|
|
(extend-k-pair d d^ expr '() k))))))]
|
|
[(eq? (car t) 'mark)
|
|
(let ([n (cdr t)])
|
|
(let-values ([(expr expr^ locs k)
|
|
(read-expr p locs k)])
|
|
(cond
|
|
[(assq n locs) =>
|
|
(lambda (x)
|
|
(let ([loc (cdr x)])
|
|
(when (loc-set? loc) ;;; FIXME: pos
|
|
(die 'read "duplicate mark" n))
|
|
(set-loc-value! loc expr)
|
|
(set-loc-value^! loc expr^)
|
|
(set-loc-set?! loc #t)
|
|
(values expr expr^ locs k)))]
|
|
[else
|
|
(let ([loc (make-loc expr 'unused #t)])
|
|
(let ([locs (cons (cons n loc) locs)])
|
|
(values expr expr^ locs k)))])))]
|
|
[(eq? (car t) 'ref)
|
|
(let ([n (cdr t)])
|
|
(cond
|
|
[(assq n locs) =>
|
|
(lambda (x)
|
|
(values (cdr x) 'unused locs k))]
|
|
[else
|
|
(let ([loc (make-loc #f 'unused #f)])
|
|
(let ([locs (cons (cons n loc) locs)])
|
|
(values loc 'unused locs k)))]))]
|
|
[else (die 'read "invalid token" t)])]
|
|
[else
|
|
(die/p-1 p 'read
|
|
(format "unexpected ~s found" t))])))
|
|
(define read-expr
|
|
(lambda (p locs k)
|
|
(let-values ([(t pos) (tokenize/1+pos p)])
|
|
(parse-token p locs k t pos))))
|
|
(define read-expr-script-initial
|
|
(lambda (p locs k)
|
|
(let-values ([(t pos) (tokenize-script-initial+pos p)])
|
|
(parse-token p locs k t pos)))))
|
|
|
|
|
|
(define reduce-loc!
|
|
(lambda (x)
|
|
(let ([loc (cdr x)])
|
|
(unless (loc-set? loc)
|
|
(die 'read "referenced mark is not set" (car x)))
|
|
(when (loc? (loc-value loc))
|
|
(let f ([h loc] [t loc])
|
|
(if (loc? h)
|
|
(let ([h1 (loc-value h)])
|
|
(if (loc? h1)
|
|
(begin
|
|
(when (eq? h1 t)
|
|
(die 'read "circular marks"))
|
|
(let ([v (f (loc-value h1) (loc-value t))])
|
|
(set-loc-value! h1 v)
|
|
(set-loc-value! h v)
|
|
v))
|
|
(begin
|
|
(set-loc-value! h h1)
|
|
h1)))
|
|
h))))))
|
|
|
|
(define (read-as-comment p)
|
|
(begin (read-expr p '() void) (void)))
|
|
|
|
(define (return-annotated x)
|
|
(cond
|
|
[(and (annotation? x) (eof-object? (annotation-expression x)))
|
|
(eof-object)]
|
|
[else x]))
|
|
|
|
(define my-read
|
|
(lambda (p)
|
|
(let-values ([(expr expr^ locs k) (read-expr p '() void)])
|
|
(cond
|
|
[(null? locs) expr]
|
|
[else
|
|
(for-each reduce-loc! locs)
|
|
(k)
|
|
(if (loc? expr)
|
|
(loc-value expr)
|
|
expr)]))))
|
|
|
|
(define read-initial
|
|
(lambda (p)
|
|
(let-values ([(expr expr^ locs k) (read-expr-script-initial p '() void)])
|
|
(cond
|
|
[(null? locs) expr]
|
|
[else
|
|
(for-each reduce-loc! locs)
|
|
(k)
|
|
(if (loc? expr)
|
|
(loc-value expr)
|
|
expr)]))))
|
|
|
|
(define read-annotated
|
|
(case-lambda
|
|
[(p)
|
|
(unless (input-port? p)
|
|
(error 'read-annotated "not an input port" p))
|
|
(let-values ([(expr expr^ locs k) (read-expr p '() void)])
|
|
(cond
|
|
[(null? locs) (return-annotated expr^)]
|
|
[else
|
|
(for-each reduce-loc! locs)
|
|
(k)
|
|
(if (loc? expr)
|
|
(loc-value^ expr)
|
|
(return-annotated expr^))]))]
|
|
[() (read-annotated (current-input-port))]))
|
|
|
|
(define read-script-annotated
|
|
(lambda (p)
|
|
(let-values ([(expr expr^ locs k) (read-expr-script-initial p '() void)])
|
|
(cond
|
|
[(null? locs) (return-annotated expr^)]
|
|
[else
|
|
(for-each reduce-loc! locs)
|
|
(k)
|
|
(if (loc? expr)
|
|
(loc-value^ expr)
|
|
(return-annotated expr^))]))))
|
|
|
|
(define read-token
|
|
(case-lambda
|
|
[() (tokenize/1 (current-input-port))]
|
|
[(p)
|
|
(if (input-port? p)
|
|
(tokenize/1 p)
|
|
(die 'read-token "not an input port" p))]))
|
|
|
|
(define read
|
|
(case-lambda
|
|
[() (my-read (current-input-port))]
|
|
[(p)
|
|
(if (input-port? p)
|
|
(my-read p)
|
|
(die 'read "not an input port" p))]))
|
|
|
|
(define (get-datum p)
|
|
(unless (input-port? p)
|
|
(die 'get-datum "not an input port"))
|
|
(my-read p))
|
|
|
|
(define comment-handler
|
|
;;; this is stale, maybe delete
|
|
(make-parameter
|
|
(lambda (x) (void))
|
|
(lambda (x)
|
|
(unless (procedure? x)
|
|
(die 'comment-handler "not a procedure" x))
|
|
x)))
|
|
|
|
)
|
|
|
|
|
|
|