/usr/share/gauche-0.9/0.9.1/lib/text/csv.scm is in gauche 0.9.1-5.
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;;; csv.scm - read and write CSV (actually, xSV) format.
;;;
;;; Copyright (c) 2000-2010 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)
(use gauche.regexp)
(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)
(let ((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))))))
(define (make-csv-reader separator . args)
(let* ((quote-char (get-optional args #\"))
(quote-string (string quote-char)))
(lambda (port)
(define (start line fields)
(if (eof-object? line)
(reverse! fields)
(let ((next (string-trim line #[ ])))
(if (string-prefix? quote-string next)
(quoted (string-drop next 1) fields '())
(noquote next fields)))))
(define (noquote line fields)
(cond ((string-index line separator)
=> (lambda (i)
(start (string-drop line (+ i 1))
(cons (string-trim-right (string-take line i))
fields))))
(else (reverse! (cons (string-trim-right line #[ ]) fields)))))
(define (quoted line fields partial)
(cond ((eof-object? line) (error "unterminated quoted field"))
((string-null? line)
(quoted (read-line port) fields (cons "\n" partial)))
(else
(receive (this next) (string-scan line quote-char 'both)
(if this
(if (string-prefix? quote-string next)
(quoted (string-drop next 1) fields
(list* quote-string this partial))
(let ((next-next (string-scan next separator 'after))
(f (string-concatenate-reverse (cons this partial))))
(if next-next
(start next-next (cons f fields))
(reverse!(cons f fields)))))
(quoted (read-line port) fields
(list* "\n" line partial)))))))
(let ((line (read-line port)))
(if (eof-object? line)
line
(start line '())))
)))
(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)))
(lambda (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))
(for-each (lambda (field)
(display separator port)
(write-a-field field))
(cdr fields)))
(display newline port))))
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