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-;;; str_utils2.clj -- functional string utilities for Clojure
-
-;; by Stuart Sierra, http://stuartsierra.com/
-;; August 19, 2009
-
-;; Copyright (c) Stuart Sierra, 2009. 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.
-
-
-(ns #^{:author "Stuart Sierra"
-       :doc "This is a library of string manipulation functions.  It
-    is intented as a replacement for clojure.contrib.str-utils.
-
-    You cannot (use 'clojure.contrib.str-utils2) because it defines
-    functions with the same names as functions in clojure.core.
-    Instead, do (require '[clojure.contrib.str-utils2 :as s]) 
-    or something similar.
-
-    Goals:
-      1. Be functional
-      2. String argument first, to work with ->
-      3. Performance linear in string length
-
-    Some ideas are borrowed from
-    http://github.com/francoisdevlin/devlinsf-clojure-utils/"}
- clojure.contrib.str-utils2
- (:refer-clojure :exclude (take replace drop butlast partition
-                           contains? get repeat reverse partial))
- (:import (java.util.regex Pattern)))
-
-
-(defmacro dochars 
-  "bindings => [name string]
-
-  Repeatedly executes body, with name bound to each character in
-  string.  Does NOT handle Unicode supplementary characters (above
-  U+FFFF)."
-  [bindings & body]
-  (assert (vector bindings))
-  (assert (= 2 (count bindings)))
-  ;; This seems to be the fastest way to iterate over characters.
-  `(let [#^String s# ~(second bindings)]
-     (dotimes [i# (.length s#)]
-       (let [~(first bindings) (.charAt s# i#)]
-         ~@body))))
-
-
-(defmacro docodepoints
-  "bindings => [name string]
-
-  Repeatedly executes body, with name bound to the integer code point
-  of each Unicode character in the string.  Handles Unicode
-  supplementary characters (above U+FFFF) correctly."
-  [bindings & body]
-  (assert (vector bindings))
-  (assert (= 2 (count bindings)))
-  (let [character (first bindings)
-        string (second bindings)]
-    `(let [#^String s# ~string
-           len# (.length s#)]
-       (loop [i# 0]
-         (when (< i# len#)
-           (let [~character (.charAt s# i#)]
-             (if (Character/isHighSurrogate ~character)
-               (let [~character (.codePointAt s# i#)]
-                 ~@body
-                 (recur (+ 2 i#)))
-               (let [~character (int ~character)]
-                 ~@body
-                 (recur (inc i#))))))))))
-
-(defn codepoints
-  "Returns a sequence of integer Unicode code points in s.  Handles
-  Unicode supplementary characters (above U+FFFF) correctly."
-  [#^String s]
-  (let [len (.length s)
-        f (fn thisfn [#^String s i]
-            (when (< i len)
-              (let [c (.charAt s i)]
-                (if (Character/isHighSurrogate c)
-                  (cons (.codePointAt s i) (thisfn s (+ 2 i)))
-                  (cons (int c) (thisfn s (inc i)))))))]
-    (lazy-seq (f s 0))))
-
-(defn #^String escape
-  "Returns a new String by applying cmap (a function or a map) to each
-   character in s.  If cmap returns nil, the original character is
-   added to the output unchanged."
-  [#^String s cmap]
-  (let [buffer (StringBuilder. (.length s))]
-    (dochars [c s]
-      (if-let [r (cmap c)]
-        (.append buffer r)
-        (.append buffer c)))
-    (.toString buffer)))
-
-(defn blank?
-  "True if s is nil, empty, or contains only whitespace."
-  [#^String s]
-  (every? (fn [#^Character c] (Character/isWhitespace c)) s))
-
-(defn #^String take
-  "Take first n characters from s, up to the length of s.
-
-  Note the argument order is the opposite of clojure.core/take; this
-  is to keep the string as the first argument for use with ->"
-  [#^String s n]
-  (if (< (count s) n)
-    s
-    (.substring s 0 n)))
-
-(defn #^String drop
-  "Drops first n characters from s.  Returns an empty string if n is
-  greater than the length of s.
-
-  Note the argument order is the opposite of clojure.core/drop; this
-  is to keep the string as the first argument for use with ->"
-  [#^String s n]
-  (if (< (count s) n)
-    ""
-    (.substring s n)))
-
-(defn #^String butlast
-  "Returns s without the last n characters.  Returns an empty string
-  if n is greater than the length of s.
-
-  Note the argument order is the opposite of clojure.core/butlast;
-  this is to keep the string as the first argument for use with ->"
-  [#^String s n]
-  (if (< (count s) n)
-    ""
-    (.substring s 0 (- (count s) n))))
-
-(defn #^String tail
-  "Returns the last n characters of s."
-  [#^String s n]
-  (if (< (count s) n)
-    s
-    (.substring s (- (count s) n))))
-
-(defn #^String repeat
-  "Returns a new String containing s repeated n times."
-  [#^String s n]
-  (apply str (clojure.core/repeat n s)))
-
-(defn #^String reverse
-  "Returns s with its characters reversed."
-  [#^String s]
-  (.toString (.reverse (StringBuilder. s))))
-
-(defmulti
-  #^{:doc "Replaces all instances of pattern in string with replacement.  
-  
-  Allowed argument types for pattern and replacement are:
-   1. String and String
-   2. Character and Character
-   3. regex Pattern and String
-      (Uses java.util.regex.Matcher.replaceAll)
-   4. regex Pattern and function
-      (Calls function with re-groups of each match, uses return 
-       value as replacement.)"
-     :arglists '([string pattern replacement])
-     :tag String}
-  replace
-  (fn [#^String string pattern replacement]
-    [(class pattern) (class replacement)]))
-
-(defmethod replace [String String] [#^String s #^String a #^String b]
-  (.replace s a b))
-
-(defmethod replace [Character Character] [#^String s #^Character a #^Character b]
-  (.replace s a b))
-
-(defmethod replace [Pattern String] [#^String s re replacement]
-  (.replaceAll (re-matcher re s) replacement))
-
-(defmethod replace [Pattern clojure.lang.IFn] [#^String s re replacement]
-  (let [m (re-matcher re s)]
-    (let [buffer (StringBuffer. (.length s))]
-      (loop []
-        (if (.find m)
-          (do (.appendReplacement m buffer (replacement (re-groups m)))
-              (recur))
-          (do (.appendTail m buffer)
-              (.toString buffer)))))))
-
-(defmulti
-  #^{:doc "Replaces the first instance of pattern in s with replacement.
-
-  Allowed argument types for pattern and replacement are:
-   1. String and String
-   2. regex Pattern and String
-      (Uses java.util.regex.Matcher.replaceAll)
-   3. regex Pattern and function
-"
-     :arglists '([s pattern replacement])
-     :tag String}
-  replace-first
-  (fn [s pattern replacement]
-    [(class pattern) (class replacement)]))
-
-(defmethod replace-first [String String] [#^String s pattern replacement]
-  (.replaceFirst (re-matcher (Pattern/quote pattern) s) replacement))
-
-(defmethod replace-first [Pattern String] [#^String s re replacement]
-  (.replaceFirst (re-matcher re s) replacement))
-
-(defmethod replace-first [Pattern clojure.lang.IFn] [#^String s #^Pattern re f]
-  (let [m (re-matcher re s)]
-    (let [buffer (StringBuffer.)]
-      (if (.find m)
-        (let [rep (f (re-groups m))]
-          (.appendReplacement m buffer rep)
-          (.appendTail m buffer)
-          (str buffer))))))
-
-(defn partition
-  "Splits the string into a lazy sequence of substrings, alternating
-  between substrings that match the patthern and the substrings
-  between the matches.  The sequence always starts with the substring
-  before the first match, or an empty string if the beginning of the
-  string matches.
-
-  For example: (partition \"abc123def\" #\"[a-z]+\")
-  returns: (\"\" \"abc\" \"123\" \"def\")"
-  [#^String s #^Pattern re]
-  (let [m (re-matcher re s)]
-    ((fn step [prevend]
-       (lazy-seq
-        (if (.find m)
-          (cons (.subSequence s prevend (.start m))
-                (cons (re-groups m)
-                      (step (+ (.start m) (count (.group m))))))
-          (when (< prevend (.length s))
-            (list (.subSequence s prevend (.length s)))))))
-     0)))
-
-(defn #^String join
-  "Returns a string of all elements in coll, separated by
-  separator.  Like Perl's join."
-  [#^String separator coll]
-  (apply str (interpose separator coll)))
-
-(defn #^String chop
-  "Removes the last character of string, does nothing on a zero-length
-  string."
-  [#^String s]
-  (let [size (count s)]
-    (if (zero? size)
-      s
-      (subs s 0 (dec (count s))))))
-
-(defn #^String chomp
-  "Removes all trailing newline \\n or return \\r characters from
-  string.  Note: String.trim() is similar and faster."
-  [#^String s]
-  (replace s #"[\r\n]+$" ""))
-
-(defn title-case [#^String s]
-  (throw (Exception. "title-case not implemeted yet")))
-
-(defn #^String swap-case
-  "Changes upper case characters to lower case and vice-versa.
-  Handles Unicode supplementary characters correctly.  Uses the
-  locale-sensitive String.toUpperCase() and String.toLowerCase()
-  methods."
-  [#^String s]
-  (let [buffer (StringBuilder. (.length s))
-        ;; array to make a String from one code point
-        #^"[I" array (make-array Integer/TYPE 1)]
-    (docodepoints [c s]
-      (aset-int array 0 c)
-      (if (Character/isLowerCase c)
-        ;; Character.toUpperCase is not locale-sensitive, but
-        ;; String.toUpperCase is; so we use a String.
-        (.append buffer (.toUpperCase (String. array 0 1)))
-        (.append buffer (.toLowerCase (String. array 0 1)))))
-    (.toString buffer)))
-
-(defn #^String capitalize
-  "Converts first character of the string to upper-case, all other
-  characters to lower-case."
-  [#^String s]
-  (if (< (count s) 2)
-    (.toUpperCase s)
-    (str (.toUpperCase #^String (subs s 0 1))
-         (.toLowerCase #^String (subs s 1)))))
-
-(defn #^String ltrim
-  "Removes whitespace from the left side of string."
-  [#^String s]
-  (replace s #"^\s+" ""))
-
-(defn #^String rtrim
-  "Removes whitespace from the right side of string."
-  [#^String s]
-  (replace s #"\s+$" ""))
-
-(defn split-lines
-  "Splits s on \\n or \\r\\n."
-  [#^String s]
-  (seq (.split #"\r?\n" s)))
-
-;; borrowed from compojure.str-utils, by James Reeves, EPL 1.0
-(defn #^String map-str
-  "Apply f to each element of coll, concatenate all results into a
-  String."
-  [f coll]
-  (apply str (map f coll)))
-
-;; borrowed from compojure.str-utils, by James Reeves, EPL 1.0
-(defn grep
-  "Filters elements of coll by a regular expression.  The String
-  representation (with str) of each element is tested with re-find."
-  [re coll]
-  (filter (fn [x] (re-find re (str x))) coll))
-
-(defn partial
-  "Like clojure.core/partial for functions that take their primary
-  argument first.
-
-  Takes a function f and its arguments, NOT INCLUDING the first
-  argument.  Returns a new function whose first argument will be the
-  first argument to f.
-
-  Example: (str-utils2/partial str-utils2/take 2)
-           ;;=> (fn [s] (str-utils2/take s 2))"
-  [f & args]
-  (fn [s & more] (apply f s (concat args more))))
-
-
-;;; WRAPPERS
-
-;; The following functions are simple wrappers around java.lang.String
-;; functions.  They are included here for completeness, and for use
-;; when mapping over a collection of strings.
-
-(defn #^String upper-case
-  "Converts string to all upper-case."
-  [#^String s]
-  (.toUpperCase s))
-
-(defn #^String lower-case
-  "Converts string to all lower-case."
-  [#^String s]
-  (.toLowerCase s))
-
-(defn split
-  "Splits string on a regular expression.  Optional argument limit is
-  the maximum number of splits."
-  ([#^String s #^Pattern re] (seq (.split re s)))
-  ([#^String s #^Pattern re limit] (seq (.split re s limit))))
-
-(defn #^String trim
-  "Removes whitespace from both ends of string."
-  [#^String s]
-  (.trim s))
-
-(defn #^String contains?
-  "True if s contains the substring."
-  [#^String s substring]
-  (.contains s substring))
-
-(defn #^String get
-  "Gets the i'th character in string."
-  [#^String s i]
-  (.charAt s i))
-