/usr/share/gauche-0.9/0.9.4/lib/text/csv.scm is in gauche 0.9.4-3.
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;;; csv.scm - read and write CSV (actually, xSV) format.
;;;
;;; Copyright (c) 2000-2014 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. 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.
;;;
;;; 3. Neither the name of the authors 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
;;; OWNER 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.
;;;
(define-module text.csv
(use srfi-1)
(use srfi-11)
(use srfi-13)
(export <csv>
make-csv-reader
make-csv-writer)
)
(select-module text.csv)
;; Parameters:
;; separator - a character to be used to separate fields.
;; columns - a list of column specification.
;; (<name> :default <default> :iconv <iconv> :oconv <oconv>)
(define-class <csv> ()
((port :init-keyword :port :initform #f)
(separator :init-keyword :separator :initform #\,)
(columns :init-keyword :columns :initform #f)
(ioproc))
)
(define-method initialize ((self <csv>) initargs)
(next-method)
(let1 p (slot-ref self 'port)
(unless (is-a? (slot-ref self 'port) <port>)
(error "port must be given to instantiate <csv>"))
(slot-set! self 'ioproc
(if (input-port? p)
(make-csv-reader (slot-ref self 'separator))
(make-csv-writer (slot-ref self 'separator))))))
;; API
(define (make-csv-reader separator :optional (quote-char #\"))
(^[:optional (port (current-input-port))]
(csv-reader separator quote-char port)))
(define (csv-reader sep quo port)
(define (eor? ch) (or (eqv? ch #\newline) (eof-object? ch)))
(define (start fields)
(let1 ch (read-char port)
(cond [(eor? ch) (reverse! (cons "" fields))]
[(eqv? ch sep) (start (cons "" fields))]
[(eqv? ch quo) (quoted fields)]
[(char-whitespace? ch) (start fields)]
[else (unquoted (list ch) fields)])))
(define (unquoted chs fields)
(let loop ([ch (read-char port)] [last chs] [chs chs])
(cond [(eor? ch) (reverse! (cons (finish last) fields))]
[(eqv? ch sep) (start (cons (finish last) fields))]
[(char-whitespace? ch) (loop (read-char port) last (cons ch chs))]
[else (let1 chs (cons ch chs)
(loop (read-char port) chs chs))])))
(define (finish rchrs) (list->string (reverse! rchrs)))
(define (quoted fields)
(let loop ([ch (read-char port)] [chs '()])
(cond [(eof-object? ch) (error "unterminated quoted field")]
[(eqv? ch quo)
(if (eqv? (peek-char port) quo)
(begin (read-char port) (loop (read-char port) (cons quo chs)))
(quoted-tail (cons (finish chs) fields)))]
[else (loop (read-char port) (cons ch chs))])))
(define (quoted-tail fields)
(let loop ([ch (read-char port)])
(cond [(eor? ch) (reverse! fields)]
[(eqv? ch sep) (start fields)]
[else (loop (read-char port))])))
(if (eof-object? (peek-char port))
(eof-object)
(start '())))
(define (make-csv-writer separator :optional (newline "\n") (quote-char #\"))
(let* ([quote-string (string quote-char)]
[quote-escape (string-append quote-string quote-string)]
[quote-rx (string->regexp (regexp-quote quote-string))]
[separator-chars (if (string? separator)
(string->list separator)
(list separator))]
[special-chars
(apply char-set quote-char #\space #\newline #\return
separator-chars)])
(^[port fields]
(define (write-a-field field)
(if (string-index field special-chars)
(begin (display quote-char port)
(display (regexp-replace-all quote-rx field quote-escape) port)
(display quote-char port))
(display field port)))
(unless (null? fields)
(write-a-field (car fields))
(dolist [field (cdr fields)]
(display separator port)
(write-a-field field)))
(display newline port))))
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