abstraction fix to split: preserve vector nature of host return value…

… #359

Signed-off-by: Stuart Halloway <stu@thinkrelevance.com>

src/clj/clojure/string.clj

@@ -10,7 +10,8 @@
        :author "Stuart Sierra"}
   clojure.string
   (:refer-clojure :exclude (replace reverse))
-  (:import (java.util.regex Pattern)))
+  (:import (java.util.regex Pattern)
+           clojure.lang.LazilyPersistentVector))
 
 (defn ^String reverse
   "Returns s with its characters reversed."
@@ -123,10 +124,12 @@
 
 (defn split
   "Splits string on a regular expression.  Optional argument limit is
-  the maximum number of splits."
+  the maximum number of splits. Not lazy. Returns vector of the splits."
   {:added "1.2"}
-  ([^Pattern re ^String s] (seq (.split re s)))
-  ([^Pattern re limit ^String s] (seq (.split re s limit))))
+  ([^String s ^Pattern re]
+     (LazilyPersistentVector/createOwning (.split re s)))
+  ([ ^String s ^Pattern re limit]
+     (LazilyPersistentVector/createOwning (.split re s limit))))
 
 (defn ^String trim
   "Removes whitespace from both ends of string."

test/clojure/test_clojure/string.clj

@@ -2,6 +2,11 @@
   (:require [clojure.string :as s])
   (:use clojure.test))
 
+(deftest t-split
+  (is (= ["a" "b"] (s/split "a-b" #"-")))
+  (is (= ["a" "b-c"] (s/split "a-b-c" #"-" 2)))
+  (is (vector? (s/split "abc" #"-"))))
+
 (deftest t-reverse
   (is (= "tab" (s/reverse "bat"))))