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Java example source code file (printer.clj)

This example Java source code file (printer.clj) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

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author, baz, copyright, eclipse, error, exception, gilardi, hickey, license, public, stephen, the, throwable-, you

The printer.clj Java example source code

;   Copyright (c) Rich Hickey. All rights reserved.
;   The use and distribution terms for this software are covered by the
;   Eclipse Public License 1.0 (http://opensource.org/licenses/eclipse-1.0.php)
;   which can be found in the file epl-v10.html at the root of this distribution.
;   By using this software in any fashion, you are agreeing to be bound by
;   the terms of this license.
;   You must not remove this notice, or any other, from this software.

; Author: Stephen C. Gilardi

;;  clojure.test-clojure.printer
;;
;;  scgilardi (gmail)
;;  Created 29 October 2008

(ns clojure.test-clojure.printer
  (:use clojure.test))

(deftest print-length-empty-seq
  (let [coll () val "()"]
    (is (= val (binding [*print-length* 0] (print-str coll))))
    (is (= val (binding [*print-length* 1] (print-str coll))))))

(deftest print-length-seq
  (let [coll (range 5)
        length-val '((0 "(...)")
                     (1 "(0 ...)")
                     (2 "(0 1 ...)")
                     (3 "(0 1 2 ...)")
                     (4 "(0 1 2 3 ...)")
                     (5 "(0 1 2 3 4)"))]
    (doseq [[length val] length-val]
      (binding [*print-length* length]
        (is (= val (print-str coll)))))))

(deftest print-length-empty-vec
  (let [coll [] val "[]"]
    (is (= val (binding [*print-length* 0] (print-str coll))))
    (is (= val (binding [*print-length* 1] (print-str coll))))))

(deftest print-length-vec
  (let [coll [0 1 2 3 4]
        length-val '((0 "[...]")
                     (1 "[0 ...]")
                     (2 "[0 1 ...]")
                     (3 "[0 1 2 ...]")
                     (4 "[0 1 2 3 ...]")
                     (5 "[0 1 2 3 4]"))]
    (doseq [[length val] length-val]
      (binding [*print-length* length]
        (is (= val (print-str coll)))))))

(deftest print-level-seq
  (let [coll '(0 (1 (2 (3 (4)))))
        level-val '((0 "#")
                    (1 "(0 #)")
                    (2 "(0 (1 #))")
                    (3 "(0 (1 (2 #)))")
                    (4 "(0 (1 (2 (3 #))))")
                    (5 "(0 (1 (2 (3 (4)))))"))]
    (doseq [[level val] level-val]
      (binding [*print-level* level]
        (is (= val (print-str coll)))))))

(deftest print-level-length-coll
  (let [coll '(if (member x y) (+ (first x) 3) (foo (a b c d "Baz")))
        level-length-val
        '((0 1 "#")
          (1 1 "(if ...)")
          (1 2 "(if # ...)")
          (1 3 "(if # # ...)")
          (1 4 "(if # # #)")
          (2 1 "(if ...)")
          (2 2 "(if (member x ...) ...)")
          (2 3 "(if (member x y) (+ # 3) ...)")
          (3 2 "(if (member x ...) ...)")
          (3 3 "(if (member x y) (+ (first x) 3) ...)")
          (3 4 "(if (member x y) (+ (first x) 3) (foo (a b c d ...)))")
          (3 5 "(if (member x y) (+ (first x) 3) (foo (a b c d Baz)))"))]
    (doseq [[level length val] level-length-val]
      (binding [*print-level* level
                *print-length* length]
        (is (= val (print-str coll)))))))

(deftest print-dup-expected
  (are [x s] (= s (binding [*print-dup* true] (print-str x)))
       1 "1"
       1.0 "1.0"
       1N "1N"
       (java.math.BigInteger. "1") "#=(java.math.BigInteger. \"1\")"
       1M "1M"
       "hi" "\"hi\""))

(deftest print-dup-readable
  (are [form] (let [x form]
                (= x (read-string (binding [*print-dup* true] (print-str x)))))
       1
       1.0
       1N
       1M
       "hi"))

(def ^{:foo :anything} var-with-meta 42)
(def ^{:type :anything} var-with-type 666)

(deftest print-var
  (are [x s] (= s (pr-str x))
       #'pr-str  "#'clojure.core/pr-str"
       #'var-with-meta "#'clojure.test-clojure.printer/var-with-meta"
       #'var-with-type "#'clojure.test-clojure.printer/var-with-type"))

(deftest print-meta
  (are [x s] (binding [*print-meta* true] 
               (let [pstr (pr-str x)]
                 (and (.endsWith pstr s)
                      (.startsWith pstr "^")
                      (.contains pstr (pr-str (meta x))))))
       #'pr-str  "#'clojure.core/pr-str"
       #'var-with-meta "#'clojure.test-clojure.printer/var-with-meta"
       #'var-with-type "#'clojure.test-clojure.printer/var-with-type"))

(defn ^:private ednize-stack-trace-element
  [^StackTraceElement ste]
  [(symbol (.getClassName ste))
   (symbol (.getMethodName ste))
   (.getFileName ste)
   (.getLineNumber ste)])

(defn ^:private ednize-throwable-data
  [throwable-data]
  (-> throwable-data
      (update :via (fn [vias]
                     (map (fn [via]
                            (-> via
                                (update :type #(symbol (.getName %)))
                                (update :at ednize-stack-trace-element)))
                          vias)))
      (update :trace #(map ednize-stack-trace-element %))))

(deftest print-throwable
  (binding [*data-readers* {'error identity}]
    (are [e] (= (-> e Throwable->map ednize-throwable-data)
                (-> e pr-str read-string))
         (Exception. "heyo")
         (Throwable. "I can a throwable"
                     (Exception. "chain 1"
                                 (Exception. "chan 2")))
         (ex-info "an ex-info" {:with "its" :data 29})
         (Exception. "outer"
                     (ex-info "an ex-info" {:with "data"}
                              (Error. "less outer"
                                      (ex-info "the root"
                                               {:with "even" :more 'data})))))))

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