clojure - 如何使用 clojure.edn/read 获取文件中的对象序列？

Question

Clojure 1.5 引入 clojure.edn ，其中包括一个需要 PushbackReader 的读取函数.

如果我想读取前五个对象，我可以这样做:

(with-open [infile (java.io.PushbackReader. (clojure.java.io/reader "foo.txt"))]
  (binding [*in* infile]
    (let [edn-seq (repeatedly clojure.edn/read)]
      (dorun (take 5 (map println edn-seq))))))

我怎样才能打印出所有的对象？考虑到其中一些可能为零，似乎我需要检查 EOF 或类似的东西。我想要一个类似于我从 line-seq 得到的对象序列.

Answer 1

使用 :eof 键

http://clojure.github.com/clojure/clojure.edn-api.html

opts is a map that can include the following keys: :eof - value to return on end-of-file. When not supplied, eof throws an exception.

编辑:对不起，这还不够详细!给你:

(with-open [in (java.io.PushbackReader. (clojure.java.io/reader "foo.txt"))]
  (let [edn-seq (repeatedly (partial edn/read {:eof :theend} in))]
    (dorun (map println (take-while (partial not= :theend) edn-seq)))))

应该这样做