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# cl-csv
This library aims to simplify working with csvs to the bare minimum of tedium
* reads/writes csvs from/to strings, streams and files
* support streaming reads (allowing processing very large csvs, through read-csv's row-fn paramter)
* supports custom data formating
* settable quote, separator and quote-escapes
* supports multiline quoted data
* A test suite
* Detailed state about the process on error (line number, column number, char index),
current collection state
## Rationale
I had many scattered, not well tested, not easily runable pieces of
csv code. I was unhappy with this situation then decided to refactor
all of this into a single location. I wrote tests for it and had a
library so I thought I might release it. This project started as
extensions and bugfixes on arnesi's CSV.
I then looked around and saw there are other csv libs out there that
probably mostly accomplished what I had set out to do. However, I
already had code that was tested and had an easier license (BSD) so, I
figured why not just release it anyway.
### Other Available CSV libs
* http://members.optusnet.com.au/apicard/csv-parser.lisp
* http://www.cliki.net/fare-csv
## Escaping and quotes
There are two modes for escaping currently
* :quote - by default cl-csv treats `""` as an escape for a single double-quote
* :following - read the character after the escape sequence verbatim, commonly
the `*quote-escape*` will be set to `#\\` when the escape mode is following.
## Signals and Restarts
* `*enable-signals*` will cause a csv-data-read or csv-row-read to be
signaled for each piece of data and row read. There is a `filter`
restart available which will cause the filter value to be used
instead. Enabling signals is ~2xs as slow as not, so by default
they are not enabled.
* `in-csv` iterate clause and `read-csv` support `continue` and `filter`
restarts for errors occuring during read-csv-row
## Functional Filters
* row-fn (lambda (row) ) - does something with a row instead of collecting it
* map-fn (lambda (row) ) - can modify a row on the way to collecting it
* data-map-fn (lambda (datum &key csv-reader &allow-other-keys) )
can modify a single datum on the way to collecting it, used to implement empty
string to null conversions
## Library Integration
* [data-table](https://github.com/AccelerationNet/data-table) - functions for building data-tables from csv's, must `(asdf:load-system :cl-csv-data-table)`
* [clsql](http://clsql.b9.com/) must `(asdf:load-system :cl-csv-clsql)`
* import-from-csv
* serial-import-from-csv
* [iterate](http://common-lisp.net/project/iterate) - provides an
`in-csv` driver clause for iterating over a CSV
## Examples
```lisp
;; read a file into a list of lists
(cl-csv:read-csv #P"file.csv")
=> (("1" "2" "3") ("4" "5" "6"))
;; read a file that's tab delimited
(cl-csv:read-csv #P"file.tab" :separator #\Tab)
;; read a file and return a list of objects created from each row
(cl-csv:read-csv #P"file.csv"
:map-fn #'(lambda (row)
(make-instance 'object
:foo (nth 0 row)
:baz (nth 2 row))))
;; read csv from a string (streams also supported)
(cl-csv:read-csv "1,2,3
4,5,6")
=> (("1" "2" "3") ("4" "5" "6"))
;; loop over a CSV for effect
(let ((sum 0))
(cl-csv:do-csv (row #P"file.csv")
(incf sum (parse-integer (nth 0 row))))
sum)
;; loop over a CSV using iterate
(iter (for (foo bar baz) in-csv #P"file.csv")
(collect (make-instance 'object :foo foo :baz baz)))
```
## Changelog
* v 1.0.2 - standardized on csv-reader for a name instead
of using table in some places and reader in others
Updated iterate clauses
* v 1.0.1 - New parser, same interface, faster and cleaner,
and more flexible
added data-map-fn, use this to handle null conversion
* v 1.0 - Long term stable version
## Authors
* [Acceleration.net](http://www.acceleration.net/)
* [Russ Tyndall](http://russ.unwashedmeme.com/blog)
* [Nathan Bird](http://the.unwashedmeme.com/blog)
* [Ryan Davis](http://ryepup.unwashedmeme.com/blog)
```
;; Copyright (c) 2011 Russ Tyndall , Acceleration.net http://www.acceleration.net
;; Copyright (c) 2002-2006, Edward Marco Baringer
;; 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 Edward Marco Baringer, nor BESE, 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.
```
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