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;;; extras.scm - Optional non-standard extensions
;
; Copyright (c) 2008-2014, The Chicken Team
; Copyright (c) 2000-2007, Felix L. Winkelmann
; All rights reserved.
;
; Redistribution and use in source and binary forms, with or without modification, are permitted provided that the following
; conditions are met:
;
; Redistributions of source code must retain the above copyright notice, this list of conditions and the following
; disclaimer.
; Redistributions in binary form must reproduce the above copyright notice, this list of conditions and the following
; disclaimer in the documentation and/or other materials provided with the distribution.
; Neither the name of the author nor the names of its contributors may be used to endorse or promote
; products derived from this software without specific prior written permission.
;
; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS
; OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
; AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR
; CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
; CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
; SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
; THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
; OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
; POSSIBILITY OF SUCH DAMAGE.
(declare
(unit extras)
(uses data-structures))
(declare
(hide fprintf0 generic-write) )
(include "common-declarations.scm")
(register-feature! 'extras)
;;; Read expressions from file:
(define read-file
(let ([read read]
[call-with-input-file call-with-input-file] )
(lambda (#!optional (port ##sys#standard-input) (reader read) max)
(define (slurp port)
(do ((x (reader port) (reader port))
(i 0 (fx+ i 1))
(xs '() (cons x xs)) )
((or (eof-object? x) (and max (fx>= i max))) (##sys#fast-reverse xs)) ) )
(if (port? port)
(slurp port)
(call-with-input-file port slurp) ) ) ) )
;;; Random numbers:
(define (randomize . n)
(let ((nn (if (null? n)
(##sys#flo2fix (fp/ (current-seconds) 1000.0)) ; wall clock time
(car n))))
(##sys#check-exact nn 'randomize)
(##core#inline "C_randomize" nn) ) )
(define (random n)
(##sys#check-exact n 'random)
(if (eq? n 0)
0
(##core#inline "C_random_fixnum" n) ) )
;;; Line I/O:
(define read-line
(let ()
(lambda args
(let* ([parg (pair? args)]
[p (if parg (car args) ##sys#standard-input)]
[limit (and parg (pair? (cdr args)) (cadr args))])
(##sys#check-input-port p #t 'read-line)
(cond ((##sys#slot (##sys#slot p 2) 8) => (lambda (rl) (rl p limit)))
(else
(let* ((buffer-len (if limit limit 256))
(buffer (##sys#make-string buffer-len)))
(let loop ([i 0])
(if (and limit (fx>= i limit))
(##sys#substring buffer 0 i)
(let ([c (##sys#read-char-0 p)])
(if (eof-object? c)
(if (fx= i 0)
c
(##sys#substring buffer 0 i) )
(case c
[(#\newline) (##sys#substring buffer 0 i)]
[(#\return)
(let ([c (peek-char p)])
(if (char=? c #\newline)
(begin (##sys#read-char-0 p)
(##sys#substring buffer 0 i))
(##sys#substring buffer 0 i) ) ) ]
[else
(when (fx>= i buffer-len)
(set! buffer
(##sys#string-append buffer (make-string buffer-len)))
(set! buffer-len (fx+ buffer-len buffer-len)) )
(##core#inline "C_setsubchar" buffer i c)
(loop (fx+ i 1)) ] ) ) ) ) ) ) ) ) ) ) ) )
(define read-lines
(lambda port-and-max
(let* ((port (if (pair? port-and-max) (##sys#slot port-and-max 0) ##sys#standard-input))
(rest (and (pair? port-and-max) (##sys#slot port-and-max 1)))
(max (if (pair? rest) (##sys#slot rest 0) #f)) )
(define (doread port)
(let loop ((lns '())
(n (or max 1000000000)) ) ; this is silly
(if (eq? n 0)
(##sys#fast-reverse lns)
(let ((ln (read-line port)))
(if (eof-object? ln)
(##sys#fast-reverse lns)
(loop (cons ln lns) (fx- n 1)) ) ) ) ) )
(if (string? port)
(call-with-input-file port doread)
(begin
(##sys#check-input-port port #t 'read-lines)
(doread port) ) ) ) ) )
(define write-line
(lambda (str . port)
(let* ((p (if (##core#inline "C_eqp" port '())
##sys#standard-output
(##sys#slot port 0) ) ))
(##sys#check-output-port p #t 'write-line)
(##sys#check-string str 'write-line)
((##sys#slot (##sys#slot p 2) 3) p str) ; write-string method
(##sys#write-char-0 #\newline p))))
;;; Extended I/O
(define (##sys#read-string! n dest port start)
(cond ((eq? n 0) 0)
(else
(let ((rdstring (##sys#slot (##sys#slot port 2) 7)))
(if rdstring
(let loop ((start start) (n n) (m 0))
(let ((n2 (rdstring port n dest start)))
(##sys#setislot port 5 ; update port-position
(fx+ (##sys#slot port 5) n2))
(cond ((eq? n2 0) m)
((or (not n) (fx< n2 n))
(loop (fx+ start n2) (and n (fx- n n2)) (fx+ m n2)))
(else (fx+ n2 m)))))
(let loop ((start start) (n n) (m 0))
(let ((n2 (let ((c (##sys#read-char-0 port)))
(if (eof-object? c)
0
(begin
(##core#inline "C_setsubchar" dest start c)
1) ) ) ) )
(cond ((eq? n2 0) m)
((or (not n) (fx< n2 n))
(loop (fx+ start n2) (and n (fx- n n2)) (fx+ m n2)) )
(else (fx+ n2 m))) )))))))
(define (read-string! n dest #!optional (port ##sys#standard-input) (start 0))
(##sys#check-input-port port #t 'read-string!)
(##sys#check-string dest 'read-string!)
(when n (##sys#check-exact n 'read-string!))
(let ((dest-size (##sys#size dest)))
(unless (and n (fx<= (fx+ start n) dest-size))
(set! n (fx- dest-size start))))
(##sys#check-exact start 'read-string!)
(##sys#read-string! n dest port start) )
(define-constant read-string-buffer-size 2048)
(define ##sys#read-string/port
(lambda (n p)
(##sys#check-input-port p #t 'read-string)
(cond (n (##sys#check-exact n 'read-string)
(let* ((str (##sys#make-string n))
(n2 (##sys#read-string! n str p 0)) )
(if (eq? n n2)
str
(##sys#substring str 0 n2))))
(else
(let ([out (open-output-string)]
(buf (make-string read-string-buffer-size)))
(let loop ()
(let ((n (##sys#read-string! read-string-buffer-size
buf p 0)))
(cond ((eq? n 0)
(get-output-string out))
(else
(write-string buf n out)
(loop))))))))))
(define (read-string #!optional n (port ##sys#standard-input))
(##sys#read-string/port n port) )
;; <procedure>(read-buffered [PORT])</procedure>
;;
;; Reads any remaining data buffered after previous read operations on
;; {{PORT}}. If no remaining data is currently buffered, an empty string
;; is returned. This procedure will never block. Currently only useful for
;; string-, process- and tcp ports.
(define (read-buffered #!optional (port ##sys#standard-input))
(##sys#check-input-port port #t 'read-buffered)
(let ((rb (##sys#slot (##sys#slot port 2) 9))) ; read-buffered method
(if rb
(rb port)
"")))
;;; read token of characters that satisfy a predicate
(define read-token
(lambda (pred . port)
(let ([port (optional port ##sys#standard-input)])
(##sys#check-input-port port #t 'read-token)
(let ([out (open-output-string)])
(let loop ()
(let ([c (##sys#peek-char-0 port)])
(if (and (not (eof-object? c)) (pred c))
(begin
(##sys#write-char-0 (##sys#read-char-0 port) out)
(loop) )
(get-output-string out) ) ) ) ) ) ) )
(define write-string
(lambda (s . more)
(##sys#check-string s 'write-string)
(let-optionals more ([n #f] [port ##sys#standard-output])
(##sys#check-output-port port #t 'write-string)
(when n (##sys#check-exact n 'write-string))
((##sys#slot (##sys#slot port 2) 3) ; write-string
port
(if (and n (fx< n (##sys#size s)))
(##sys#substring s 0 n)
s)))))
;;; Binary I/O
(define (read-byte #!optional (port ##sys#standard-input))
(##sys#check-input-port port #t 'read-byte)
(let ((x (##sys#read-char-0 port)))
(if (eof-object? x)
x
(char->integer x) ) ) )
(define (write-byte byte #!optional (port ##sys#standard-output))
(##sys#check-exact byte 'write-byte)
(##sys#check-output-port port #t 'write-byte)
(##sys#write-char-0 (integer->char byte) port) )
;;; Pretty print:
;
; Copyright (c) 1991, Marc Feeley
; Author: Marc Feeley (feeley@iro.umontreal.ca)
; Distribution restrictions: none
;
; Modified by felix for use with CHICKEN
;
(define generic-write
(lambda (obj display? width output)
(define (read-macro? l)
(define (length1? l) (and (pair? l) (null? (cdr l))))
(let ((head (car l)) (tail (cdr l)))
(case head
((quote quasiquote unquote unquote-splicing) (length1? tail))
(else #f))))
(define (read-macro-body l)
(cadr l))
(define (read-macro-prefix l)
(let ((head (car l)) (tail (cdr l)))
(case head
((quote) "'")
((quasiquote) "`")
((unquote) ",")
((unquote-splicing) ",@"))))
(define (out str col)
(and col (output str) (+ col (string-length str))))
(define (wr obj col)
(define (wr-expr expr col)
(if (read-macro? expr)
(wr (read-macro-body expr) (out (read-macro-prefix expr) col))
(wr-lst expr col)))
(define (wr-lst l col)
(if (pair? l)
(let loop ((l (cdr l))
(col (and col (wr (car l) (out "(" col)))))
(cond ((not col) col)
((pair? l)
(loop (cdr l) (wr (car l) (out " " col))))
((null? l) (out ")" col))
(else (out ")" (wr l (out " . " col))))))
(out "()" col)))
(cond ((pair? obj) (wr-expr obj col))
((null? obj) (wr-lst obj col))
((eof-object? obj) (out "#!eof" col))
((vector? obj) (wr-lst (vector->list obj) (out "#" col)))
((boolean? obj) (out (if obj "#t" "#f") col))
((##sys#number? obj) (out (##sys#number->string obj) col))
((symbol? obj)
(let ([s (open-output-string)])
(##sys#print obj #t s)
(out (get-output-string s) col) ) )
((procedure? obj) (out (##sys#procedure->string obj) col))
((string? obj)
(if display?
(out obj col)
(let loop ((i 0) (j 0) (col (out "\"" col)))
(if (and col (fx< j (string-length obj)))
(let ((c (string-ref obj j)))
(cond
((or (char=? c #\\)
(char=? c #\"))
(loop j
(+ j 1)
(out "\\"
(out (##sys#substring obj i j)
col))))
((or (char<? c #\x20)
(char=? c #\x7f))
(loop (fx+ j 1)
(fx+ j 1)
(let ((col2
(out (##sys#substring obj i j) col)))
(cond ((assq c '((#\tab . "\\t")
(#\newline . "\\n")
(#\return . "\\r")
(#\vtab . "\\v")
(#\page . "\\f")
(#\alarm . "\\a")
(#\backspace . "\\b")))
=>
(lambda (a)
(out (cdr a) col2)))
(else
(out (number->string (char->integer c) 16)
(out (if (char<? c #\x10) "0" "")
(out "\\x" col2))))))))
(else (loop i (fx+ j 1) col))))
(out "\""
(out (##sys#substring obj i j) col))))))
((char? obj) (if display?
(out (make-string 1 obj) col)
(let ([code (char->integer obj)])
(out "#\\" col)
(cond [(char-name obj)
=> (lambda (cn)
(out (##sys#slot cn 1) col) ) ]
[(fx< code 32)
(out "x" col)
(out (number->string code 16) col) ]
[(fx> code 255)
(out (if (fx> code #xffff) "U" "u") col)
(out (number->string code 16) col) ]
[else (out (make-string 1 obj) col)] ) ) ) )
((##core#inline "C_undefinedp" obj) (out "#<unspecified>" col))
((##core#inline "C_anypointerp" obj) (out (##sys#pointer->string obj) col))
((eq? obj (##sys#slot '##sys#arbitrary-unbound-symbol 0))
(out "#<unbound value>" col) )
((##sys#generic-structure? obj)
(let ([o (open-output-string)])
(##sys#user-print-hook obj #t o)
(out (get-output-string o) col) ) )
((port? obj) (out (string-append "#<port " (##sys#slot obj 3) ">") col))
((##core#inline "C_bytevectorp" obj)
(out "#${" col)
(let ((len (##sys#size obj)))
(do ((i 0 (fx+ i 1)))
((fx>= i len))
(let ((b (##sys#byte obj i)))
(when (fx< b 16)
(out "0" col))
(out (##sys#number->string b 16) col)))
(out "}" col)))
((##core#inline "C_lambdainfop" obj)
(out "#<lambda info " col)
(out (##sys#lambda-info->string obj) col)
(out ">" col) )
(else (out "#<unprintable object>" col)) ) )
(define (pp obj col)
(define (spaces n col)
(if (> n 0)
(if (> n 7)
(spaces (- n 8) (out " " col))
(out (##sys#substring " " 0 n) col))
col))
(define (indent to col)
(and col
(if (< to col)
(and (out (make-string 1 #\newline) col) (spaces to 0))
(spaces (- to col) col))))
(define (pr obj col extra pp-pair)
(if (or (pair? obj) (vector? obj)) ; may have to split on multiple lines
(let ((result '())
(left (max (+ (- (- width col) extra) 1) max-expr-width)))
(generic-write obj display? #f
(lambda (str)
(set! result (cons str result))
(set! left (- left (string-length str)))
(> left 0)))
(if (> left 0) ; all can be printed on one line
(out (reverse-string-append result) col)
(if (pair? obj)
(pp-pair obj col extra)
(pp-list (vector->list obj) (out "#" col) extra pp-expr))))
(wr obj col)))
(define (pp-expr expr col extra)
(if (read-macro? expr)
(pr (read-macro-body expr)
(out (read-macro-prefix expr) col)
extra
pp-expr)
(let ((head (car expr)))
(if (symbol? head)
(let ((proc (style head)))
(if proc
(proc expr col extra)
(if (> (string-length (##sys#symbol->qualified-string head))
max-call-head-width)
(pp-general expr col extra #f #f #f pp-expr)
(pp-call expr col extra pp-expr))))
(pp-list expr col extra pp-expr)))))
; (head item1
; item2
; item3)
(define (pp-call expr col extra pp-item)
(let ((col* (wr (car expr) (out "(" col))))
(and col
(pp-down (cdr expr) col* (+ col* 1) extra pp-item))))
; (item1
; item2
; item3)
(define (pp-list l col extra pp-item)
(let ((col (out "(" col)))
(pp-down l col col extra pp-item)))
(define (pp-down l col1 col2 extra pp-item)
(let loop ((l l) (col col1))
(and col
(cond ((pair? l)
(let ((rest (cdr l)))
(let ((extra (if (null? rest) (+ extra 1) 0)))
(loop rest
(pr (car l) (indent col2 col) extra pp-item)))))
((null? l)
(out ")" col))
(else
(out ")"
(pr l
(indent col2 (out "." (indent col2 col)))
(+ extra 1)
pp-item)))))))
(define (pp-general expr col extra named? pp-1 pp-2 pp-3)
(define (tail1 rest col1 col2 col3)
(if (and pp-1 (pair? rest))
(let* ((val1 (car rest))
(rest (cdr rest))
(extra (if (null? rest) (+ extra 1) 0)))
(tail2 rest col1 (pr val1 (indent col3 col2) extra pp-1) col3))
(tail2 rest col1 col2 col3)))
(define (tail2 rest col1 col2 col3)
(if (and pp-2 (pair? rest))
(let* ((val1 (car rest))
(rest (cdr rest))
(extra (if (null? rest) (+ extra 1) 0)))
(tail3 rest col1 (pr val1 (indent col3 col2) extra pp-2)))
(tail3 rest col1 col2)))
(define (tail3 rest col1 col2)
(pp-down rest col2 col1 extra pp-3))
(let* ((head (car expr))
(rest (cdr expr))
(col* (wr head (out "(" col))))
(if (and named? (pair? rest))
(let* ((name (car rest))
(rest (cdr rest))
(col** (wr name (out " " col*))))
(tail1 rest (+ col indent-general) col** (+ col** 1)))
(tail1 rest (+ col indent-general) col* (+ col* 1)))))
(define (pp-expr-list l col extra)
(pp-list l col extra pp-expr))
(define (pp-lambda expr col extra)
(pp-general expr col extra #f pp-expr-list #f pp-expr))
(define (pp-if expr col extra)
(pp-general expr col extra #f pp-expr #f pp-expr))
(define (pp-cond expr col extra)
(pp-call expr col extra pp-expr-list))
(define (pp-case expr col extra)
(pp-general expr col extra #f pp-expr #f pp-expr-list))
(define (pp-and expr col extra)
(pp-call expr col extra pp-expr))
(define (pp-let expr col extra)
(let* ((rest (cdr expr))
(named? (and (pair? rest) (symbol? (car rest)))))
(pp-general expr col extra named? pp-expr-list #f pp-expr)))
(define (pp-begin expr col extra)
(pp-general expr col extra #f #f #f pp-expr))
(define (pp-do expr col extra)
(pp-general expr col extra #f pp-expr-list pp-expr-list pp-expr))
;; define formatting style (change these to suit your style)
(define indent-general 2)
(define max-call-head-width 5)
(define max-expr-width 50)
(define (style head)
(case head
((lambda let* letrec letrec* define) pp-lambda)
((if set!) pp-if)
((cond) pp-cond)
((case) pp-case)
((and or) pp-and)
((let) pp-let)
((begin) pp-begin)
((do) pp-do)
(else #f)))
(pr obj col 0 pp-expr))
(if width
(out (make-string 1 #\newline) (pp obj 0))
(wr obj 0))))
; (pretty-print obj port) pretty prints 'obj' on 'port'. The current
; output port is used if 'port' is not specified.
(define pretty-print-width (make-parameter 79))
(define (pretty-print obj . opt)
(let ((port (if (pair? opt) (car opt) (current-output-port))))
(generic-write obj #f (pretty-print-width) (lambda (s) (display s port) #t))
(##core#undefined) ) )
(define pp pretty-print)
;;; Write simple formatted output:
(define fprintf0
(lambda (loc port msg args)
(when port (##sys#check-output-port port #t loc))
(let ((out (if (and port (##sys#tty-port? port))
port
(open-output-string))))
(let rec ([msg msg] [args args])
(##sys#check-string msg loc)
(let ((index 0)
(len (##sys#size msg)) )
(define (fetch)
(let ((c (##core#inline "C_subchar" msg index)))
(set! index (fx+ index 1))
c) )
(define (next)
(if (##core#inline "C_eqp" args '())
(##sys#error loc "too few arguments to formatted output procedure")
(let ((x (##sys#slot args 0)))
(set! args (##sys#slot args 1))
x) ) )
(let loop ()
(unless (fx>= index len)
(let ((c (fetch)))
(if (and (eq? c #\~) (fx< index len))
(let ((dchar (fetch)))
(case (char-upcase dchar)
((#\S) (write (next) out))
((#\A) (display (next) out))
((#\C) (##sys#write-char-0 (next) out))
((#\B) (display (##sys#number->string (next) 2) out))
((#\O) (display (##sys#number->string (next) 8) out))
((#\X) (display (##sys#number->string (next) 16) out))
((#\!) (##sys#flush-output out))
((#\?)
(let* ([fstr (next)]
[lst (next)] )
(##sys#check-list lst loc)
(rec fstr lst) out) )
((#\~) (##sys#write-char-0 #\~ out))
((#\% #\N) (newline out))
(else
(if (char-whitespace? dchar)
(let skip ((c (fetch)))
(if (char-whitespace? c)
(skip (fetch))
(set! index (fx- index 1)) ) )
(##sys#error loc "illegal format-string character" dchar) ) ) ) )
(##sys#write-char-0 c out) )
(loop) ) ) ) ) )
(cond ((not port) (get-output-string out))
((not (eq? out port))
(##sys#print (get-output-string out) #f port) ) ) ) ) )
(define (fprintf port fstr . args)
(fprintf0 'fprintf port fstr args) )
(define (printf fstr . args)
(fprintf0 'printf ##sys#standard-output fstr args) )
(define (sprintf fstr . args)
(fprintf0 'sprintf #f fstr args) )
(define format
(lambda (fmt-or-dst . args)
(apply (cond [(not fmt-or-dst) sprintf]
[(boolean? fmt-or-dst) printf]
[(string? fmt-or-dst) (set! args (cons fmt-or-dst args)) sprintf]
[(output-port? fmt-or-dst) (set! args (cons fmt-or-dst args)) fprintf]
[else
(##sys#error 'format "illegal destination" fmt-or-dst args)])
args) ) )
(register-feature! 'srfi-28)
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