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#lang racket/base
(require racket/fixnum
racket/port
"immediate.rkt"
"gensym.rkt")
(provide scheme-readtable)
(define (hash-three c in src line col pos)
(define got-c (peek-char in))
(cond
[(eqv? #\% got-c)
(read-char in)
`($primitive 3 ,(read/recursive in))]
[else
(hash-graph #\3 in src line col pos)]))
(define (hash-two c in src line col pos)
(define got-c (peek-char in))
(cond
[(eqv? #\% got-c)
(read-char in)
`($primitive 2 ,(read/recursive in))]
[else
(hash-graph #\2 in src line col pos)]))
(define (hash-one c in src line col pos)
(define got-c (peek-char in))
(cond
[(eqv? #\# got-c)
;; "read.ss" has a `#1#` reference before the
;; `#1=...` definition; it's going to turn out
;; to be `black-hole`
(define name (object-name in))
(cond
[(and (or (string? name) (path? name))
(regexp-match? #rx"read[.]ss$" name))
(read-char in)
black-hole]
[else
(hash-graph #\1 in src line col pos)])]
[else
(hash-graph #\1 in src line col pos)]))
(define (hash-graph c in src line col pos)
(cond
[(and (eqv? (peek-char in) #\=)
(eqv? (peek-char in 1) #\#)
(eqv? (peek-char in 2) c)
(eqv? (peek-char in 3) #\#))
(read-string 4 in)
black-hole]
[else
(define new-in (input-port-append #f (open-input-string (string #\# c)) in))
(read/recursive new-in #f #f #t)]))
(define (hash-percent c in src line col pos)
`($primitive ,(read/recursive in)))
(define (hash-bang c in src line col pos)
(define sym (read/recursive in))
(case sym
[(eof) eof]
[(base-rtd) base-rtd]
[(bwp) bwp]
[(chezscheme) (make-special-comment 'chezscheme)]
[else (error 'hash-bang "unrecognized ~s" sym)]))
(define ((paren closer) c in src line col pos)
;; parse a list, but allow an eof element as produced by #!eof
(let loop ()
(define c (peek-char in))
(cond
[(eqv? closer c)
(read-char in)
null]
[(char-whitespace? c)
(read-char in)
(loop)]
[(and (eqv? #\. c)
(char-whitespace? (peek-char in 1)))
(read-char in)
(begin0
(read/recursive in)
(let loop ()
(define c (read-char in))
(cond
[(char-whitespace? c) (loop)]
[(eqv? c closer) (void)]
[else (error 'parens "unexpected: ~s" c)])))]
[else
(define v (read/recursive in))
(if (special-comment? v)
(loop)
(cons v (loop)))])))
(define (hash-backslash c in src line col pos)
(define next-c (peek-char in))
(cond
[(or (char-alphabetic? next-c)
(char-numeric? next-c))
(define sym (read/recursive in))
(case sym
[(newline) #\newline]
[(return) #\return]
[(nel) #\u85]
[(ls) #\u2028]
[(space) #\space]
[(nul) #\nul]
[(tab) #\tab]
[(vtab vt) #\vtab]
[(page) #\page]
[(alarm bel) #\u7]
[(backspace) #\backspace]
[(esc) #\u1b]
[(delete) #\u7F]
[(rubout) #\rubout]
[(linefeed) #\linefeed]
[(0 1 2 3 4 5 6 7 8 9)
(integer->char (+ sym (char->integer #\0)))]
[else
(define str (symbol->string sym))
(cond
[(= 1 (string-length str))
(string-ref str 0)]
[(eqv? #\x (string-ref str 0))
(integer->char (string->number (substring str 1) 16))]
[else
(error 'hash-backslash "unrecognized ~s" str)])])]
[else (read-char in)]))
(define (hash-vee c in src line col pos)
(case (read-char in)
[(#\u)
(unless (eqv? #\8 (read-char in)) (error 'hash-vee "not 8"))
(define l (read/recursive in))
(list->bytes l)]
[(#\f)
(unless (eqv? #\x (read-char in)) (error 'hash-vee "not 8"))
(define l (read/recursive in))
(apply fxvector l)]
[else (error 'hash-vee "unexpected")]))
(define (as-symbol c in src line col pos)
(string->symbol (string c)))
(define scheme-readtable
(make-readtable
#f
#\0 'dispatch-macro hash-graph
#\1 'dispatch-macro hash-one
#\2 'dispatch-macro hash-two
#\3 'dispatch-macro hash-three
#\4 'dispatch-macro hash-graph
#\5 'dispatch-macro hash-graph
#\6 'dispatch-macro hash-graph
#\7 'dispatch-macro hash-graph
#\8 'dispatch-macro hash-graph
#\9 'dispatch-macro hash-graph
#\% 'dispatch-macro hash-percent
#\! 'dispatch-macro hash-bang
#\{ 'dispatch-macro hash-curly
#\{ 'terminating-macro as-symbol
#\} 'terminating-macro as-symbol
#\[ 'terminating-macro (paren #\])
#\( 'terminating-macro (paren #\))
#\\ 'dispatch-macro hash-backslash
#\v 'dispatch-macro hash-vee))
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