Created
January 25, 2019 09:25
Star
You must be signed in to star a gist
progv を使って csv ヘッダを変数名として取り込んでループ回す
This file contains bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
(in-package :cl-user) | |
(ql:quickload "split-sequence") | |
(defparameter *test-file* "/tmp/progv_test.csv") | |
(defun write-test-csv () | |
(with-open-file (out *test-file* :direction :output :if-does-not-exist :create | |
:if-exists :rename) | |
(format out "col1,col2,col3~%") | |
(format out "100,200,300~%") | |
(format out "a,b,c~%"))) | |
(defun csv-callback () | |
(declare (special |col1| |col2| |col3|)) | |
(format t "~&col1: ~A, col2: ~A, col3: ~A~%" | |
|col1| |col2| |col3|)) | |
(defun read-csv-and-use-callback (&optional (func #'csv-callback)) | |
(assert (probe-file *test-file*)) | |
(with-open-file (in *test-file* :direction :input) | |
(let* ((header (read-line in)) | |
(cols-list (split-sequence:split-sequence #\, header)) | |
(cols-symbols (mapcar #'intern cols-list))) | |
(loop for line = (read-line in nil nil) | |
while line | |
do (let ((data (split-sequence:split-sequence #\, line))) | |
(progv cols-symbols data | |
(funcall func))))))) | |
#| | |
CL-USER> (progn (write-test-csv) | |
(read-csv-and-use-callback)) | |
col1: 100, col2: 200, col3: 300 | |
col1: a, col2: b, col3: c | |
NIL | |
|# |
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment