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242 lines
8.6 KiB
Scheme
242 lines
8.6 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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(module read mzscheme
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(require (lib "lex.ss" "parser-tools")
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(prefix : (lib "lex-sre.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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[(:or scheme-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-char) (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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[(:or (:: 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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[letter (:or (:/ "a" "z") (:/ #\A #\Z))]
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[digit (:/ #\0 #\9)]
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[scheme-whitespace (:or #\newline #\return #\tab #\space #\vtab)]
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[initial (:or letter (char-set "!$%&*/:<=>?^_~@"))]
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[subsequent (:or initial digit (char-set "+-.@"))]
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[comment (:: #\; (:* (:~ #\newline)) #\newline)]
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;; See ${PLTHOME}/collects/syntax-color/scheme-lexer.ss for an example of
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;; using regexp macros to avoid the cut and paste.
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; [numR (:: prefixR complexR)]
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; [complexR (:or 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 (:or uintegerR (:: uintegerR "/" uintegerR) decimalR)]
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; [uintegerR (:: (:+ digitR) (:* #\#))]
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; [prefixR (:or (:: radixR exactness)
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; (:: exactness radixR))]
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[num2 (:: prefix2 complex2)]
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[complex2 (:or 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 (:or uinteger2 (:: uinteger2 "/" uinteger2))]
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[uinteger2 (:: (:+ digit2) (:* #\#))]
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[prefix2 (:or (:: radix2 exactness)
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(:: exactness radix2))]
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[radix2 "#b"]
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[digit2 (:or "0" "1")]
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[num8 (:: prefix8 complex8)]
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[complex8 (:or 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 (:or uinteger8 (:: uinteger8 "/" uinteger8))]
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[uinteger8 (:: (:+ digit8) (:* #\#))]
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[prefix8 (:or (:: 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 (:or 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 (:or uinteger10 (:: uinteger10 "/" uinteger10) decimal10)]
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[uinteger10 (:: (:+ digit10) (:* #\#))]
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[prefix10 (:or (:: 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 (:or (:: 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 (:or 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 (:or uinteger16 (:: uinteger16 "/" uinteger16))]
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[uinteger16 (:: (:+ digit16) (:* #\#))]
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[prefix16 (:or (:: radix16 exactness)
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(:: exactness radix16))]
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[radix16 "#x"]
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[digit16 (:or digit (:/ #\a #\f) (:/ #\A #\F))]
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[suffix (:or "" (:: exponent-marker sign (:+ digit10)))]
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[exponent-marker (:or "e" "s" "f" "d" "l")]
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[sign (:or "" "+" "-")]
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[exactness (:or "" "#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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) |