On Thu, Jun 16, 2011 at 6:07 PM, octopusgrabbus <octopusgrab...@gmail.com> wrote: > This Clojure program: > > ns test-csv > (:require [clojure.contrib.string :as str]) > (:import (java.io BufferedReader FileReader StringReader)) > (:use clojure-csv.core)) > > > (defn process-file [file-name] > (with-open [br (BufferedReader. (FileReader. file-name))] > (println (line-seq br)))) > > > (defn -main [& args] > (process-file "resultset.csv")) > > is printing a test file. I believe line-seq returns a sequence of > strings. I am having trouble figuring out where to call str/split. The > error I'm getting back is you can cast to a regular expression. Any > thoughts?
The split function takes a regular expression for its split-with-this argument, rather than a regular string. In many cases simply changing a string literal to a regex literal will do, e.g. with CSV splitting "," to #",". If you (map #(split...) (line-seq foo)) on your CSV data you'll end up with a seq of seqs of strings, each outer seq a row and each inner seq the cells of that row. If there are escaped embedded commas in some of the cell value strings they'll still be escaped, however it is that they are escaped, though, so you might want to put the whole thing through (map #(map unescape %) outer-seq) to unescape everything after the splitting; implementing the unescape function is left as an exercise for the reader. :) Note that all of this stuff is lazy, so you'll want to keep the reader open until you've done processing everything and have a result to return, and if the result is a seq it may need doall called on it first depending on how it is constructed. On the other hand this means you can fairly transparently work with CSV files larger than main memory. -- Some people, when confronted with a problem, think “I know, I'll use regular expressions.” Now they have two problems. - Jamie Zawinski -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
