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241 lines
8.2 KiB
Scheme
241 lines
8.2 KiB
Scheme
;; This implements the equivalent of mzscheme's read-syntax for R5RS scheme.
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;; It has not been thoroughly tested. Also it will read an entire file into a
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;; list of syntax objects, instead of returning one syntax object at a time
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;; Everything in this module will be read with case sensitivity.
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#cs
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(module read mzscheme
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(require (lib "lex.ss" "parser-tools")
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(lib "yacc.ss" "parser-tools")
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(lib "readerr.ss" "syntax"))
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(define-tokens data (DATUM))
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(define-empty-tokens delim (OP CP HASHOP QUOTE QUASIQUOTE UNQUOTE UNQUOTE-SPLICING DOT EOF))
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(define scheme-lexer
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(lexer-src-pos
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;; Skip comments, without accumulating extra position information
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[(: whitespace comment) (return-without-pos (scheme-lexer input-port))]
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["#t" (token-DATUM #t)]
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["#f" (token-DATUM #f)]
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[(@ "#\\" any) (token-DATUM (caddr (string->list lexeme)))]
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["#\\space" (token-DATUM #\space)]
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["#\\newline" (token-DATUM #\newline)]
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[(: (@ initial (* subsequent)) "+" "-" "...") (token-DATUM (string->symbol lexeme))]
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[#\" (token-DATUM (list->string (get-string-token input-port)))]
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[#\( 'OP]
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[#\) 'CP]
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[#\[ 'OP]
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[#\] 'CP]
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["#(" 'HASHOP]
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[num2 (token-DATUM (string->number lexeme 2))]
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[num8 (token-DATUM (string->number lexeme 8))]
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[num10 (token-DATUM (string->number lexeme 10))]
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[num16 (token-DATUM (string->number lexeme 16))]
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["'" 'QUOTE]
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["`" 'QUASIQUOTE]
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["," 'UNQUOTE]
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[",@" 'UNQUOTE-SPLICING]
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["." 'DOT]
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[(eof) 'EOF]))
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(define get-string-token
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(lexer
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[(^ #\" #\\) (cons (car (string->list lexeme))
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(get-string-token input-port))]
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[(@ #\\ #\\) (cons #\\ (get-string-token input-port))]
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[(@ #\\ #\") (cons #\" (get-string-token input-port))]
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[#\" null]))
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(define-lex-abbrevs
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[any (- #\000 #\377)]
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[letter (: (- "a" "z") (- #\A #\Z))]
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[digit (- #\0 #\9)]
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[whitespace (: #\newline #\return #\tab #\space #\vtab)]
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[initial (: letter "!" "$" "%" "&" "*" "/" ":" "<" "=" ">" "?" "^" "_" "~" "@")]
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[subsequent (: initial digit "+" "-" #\. "@")]
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[comment (@ #\; (* (^ #\newline)) #\newline)]
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; [numR (@ prefixR complexR)]
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; [complexR (: realR
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; (@ realR "@" realR)
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; (@ realR "+" urealR "i")
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; (@ realR "-" urealR "i")
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; (@ realR "+i")
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; (@ realR "-i")
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; (@ "+" urealR "i")
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; (@ "-" urealR "i")
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; (@ "+i")
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; (@ "-i"))]
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; [realR (@ sign urealR)]
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; [urealR (: uintegerR (@ uintegerR "/" uintegerR) decimalR)]
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; [uintegerR (@ (+ digitR) (* #\#))]
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; [prefixR (: (@ radixR exactness)
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; (@ exactness radixR))]
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[num2 (@ prefix2 complex2)]
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[complex2 (: real2
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(@ real2 "@" real2)
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(@ real2 "+" ureal2 "i")
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(@ real2 "-" ureal2 "i")
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(@ real2 "+i")
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(@ real2 "-i")
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(@ "+" ureal2 "i")
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(@ "-" ureal2 "i")
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(@ "+i")
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(@ "-i"))]
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[real2 (@ sign ureal2)]
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[ureal2 (: uinteger2 (@ uinteger2 "/" uinteger2))]
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[uinteger2 (@ (+ digit2) (* #\#))]
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[prefix2 (: (@ radix2 exactness)
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(@ exactness radix2))]
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[radix2 "#b"]
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[digit2 (: "0" "1")]
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[num8 (@ prefix8 complex8)]
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[complex8 (: real8
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(@ real8 "@" real8)
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(@ real8 "+" ureal8 "i")
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(@ real8 "-" ureal8 "i")
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(@ real8 "+i")
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(@ real8 "-i")
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(@ "+" ureal8 "i")
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(@ "-" ureal8 "i")
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(@ "+i")
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(@ "-i"))]
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[real8 (@ sign ureal8)]
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[ureal8 (: uinteger8 (@ uinteger8 "/" uinteger8))]
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[uinteger8 (@ (+ digit8) (* #\#))]
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[prefix8 (: (@ radix8 exactness)
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(@ exactness radix8))]
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[radix8 "#o"]
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[digit8 (- "0" "7")]
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[num10 (@ prefix10 complex10)]
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[complex10 (: real10
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(@ real10 "@" real10)
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(@ real10 "+" ureal10 "i")
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(@ real10 "-" ureal10 "i")
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(@ real10 "+i")
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(@ real10 "-i")
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(@ "+" ureal10 "i")
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(@ "-" ureal10 "i")
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(@ "+i")
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(@ "-i"))]
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[real10 (@ sign ureal10)]
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[ureal10 (: uinteger10 (@ uinteger10 "/" uinteger10) decimal10)]
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[uinteger10 (@ (+ digit10) (* #\#))]
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[prefix10 (: (@ radix10 exactness)
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(@ exactness radix10))]
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[radix10 (: (@) "#d")]
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[digit10 digit]
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[decimal10 (: (@ uinteger10 suffix)
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(@ #\. (+ digit10) (* #\#) suffix)
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(@ (+ digit10) #\. (* digit10) (* #\#) suffix)
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(@ (+ digit10) (+ #\#) #\. (* #\#) suffix))]
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[num16 (@ prefix16 complex16)]
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[complex16 (: real16
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(@ real16 "@" real16)
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(@ real16 "+" ureal16 "i")
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(@ real16 "-" ureal16 "i")
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(@ real16 "+i")
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(@ real16 "-i")
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(@ "+" ureal16 "i")
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(@ "-" ureal16 "i")
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"+i"
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"-i")]
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[real16 (@ sign ureal16)]
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[ureal16 (: uinteger16 (@ uinteger16 "/" uinteger16))]
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[uinteger16 (@ (+ digit16) (* #\#))]
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[prefix16 (: (@ radix16 exactness)
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(@ exactness radix16))]
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[radix16 "#x"]
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[digit16 (: digit (- #\a #\f) (- #\A #\F))]
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[suffix (: (@) (@ exponent-marker sign (+ digit10)))]
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[exponent-marker (: "e" "s" "f" "d" "l")]
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[sign (: (@) "+" "-")]
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[exactness (: (@) "#i" "#e")])
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(define stx-for-original-property (read-syntax #f (open-input-string "original")))
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;; A macro to build the syntax object
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(define-syntax (build-so stx)
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(syntax-case stx ()
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((_ value start end)
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(with-syntax ((start-pos (datum->syntax-object
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(syntax end)
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(string->symbol
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(format "$~a-start-pos"
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(syntax-object->datum (syntax start))))))
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(end-pos (datum->syntax-object
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(syntax end)
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(string->symbol
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(format "$~a-end-pos"
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(syntax-object->datum (syntax end))))))
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(source (datum->syntax-object
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(syntax end)
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'source-name)))
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(syntax
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(datum->syntax-object
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#f
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value
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(list source
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(position-line start-pos)
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(position-col start-pos)
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(position-offset start-pos)
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(- (position-offset end-pos)
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(position-offset start-pos)))
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stx-for-original-property))))))
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(define (scheme-parser source-name)
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(parser
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(src-pos)
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(start s)
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(end EOF)
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(error (lambda (a name val start end)
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(raise-read-error
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"read-error"
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source-name
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(position-line start)
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(position-col start)
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(position-offset start)
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(- (position-offset end)
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(position-offset start)))))
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(tokens data delim)
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(grammar
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(s [(sexp-list) (reverse $1)])
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(sexp [(DATUM) (build-so $1 1 1)]
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[(OP sexp-list CP) (build-so (reverse $2) 1 3)]
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[(HASHOP sexp-list CP) (build-so (list->vector (reverse $2)) 1 3)]
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[(QUOTE sexp) (build-so (list 'quote $2) 1 2)]
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[(QUASIQUOTE sexp) (build-so (list 'quasiquote $2) 1 2)]
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[(UNQUOTE sexp) (build-so (list 'unquote $2) 1 2)]
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[(UNQUOTE-SPLICING sexp) (build-so (list 'unquote-splicing $2) 1 2)]
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[(OP sexp-list DOT sexp CP) (build-so (append (reverse $2) $4) 1 5)])
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(sexp-list [() null]
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[(sexp-list sexp) (cons $2 $1)]))))
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(define (rs sn ip)
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(port-count-lines! ip)
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((scheme-parser sn) (lambda () (scheme-lexer ip))))
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(define readsyntax
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(case-lambda ((sn) (rs sn (current-input-port)))
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((sn ip) (rs sn ip))))
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(provide (rename readsyntax read-syntax))
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) |