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;; Generic interfaces for collection-related functions
;; by Konrad Hinsen
;; last updated May 5, 2009
;; Copyright (c) Konrad Hinsen, 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 "Konrad Hinsen"
:doc "Generic arithmetic interface
This library defines generic versions of common
collection-related functions as multimethods that can be
defined for any type."}
clojure.contrib.generic.collection
(:refer-clojure :exclude [assoc conj dissoc empty get into seq]))
;
; assoc
;
(defmulti assoc
"Returns a new collection in which the values corresponding to the
given keys are updated by the given values. Each type of collection
can have specific restrictions on the possible keys."
{:arglists '([coll & key-val-pairs])}
(fn [coll & items] (type coll)))
(defmethod assoc :default
[map & key-val-pairs]
(apply clojure.core/assoc map key-val-pairs))
; assoc-in
;
; conj
;
(defmulti conj
"Returns a new collection resulting from adding all xs to coll."
{:arglists '([coll & xs])}
(fn [coll & xs] (type coll)))
(defmethod conj :default
[coll & xs]
(apply clojure.core/conj coll xs))
;
; diassoc
;
(defmulti dissoc
"Returns a new collection in which the entries corresponding to the
given keys are removed. Each type of collection can have specific
restrictions on the possible keys."
{:arglists '([coll & keys])}
(fn [coll & keys] (type coll)))
(defmethod dissoc :default
[map & keys]
(apply clojure.core/dissoc map keys))
;
; empty
;
(defmulti empty
"Returns an empty collection of the same kind as the argument"
{:arglists '([coll])}
type)
(defmethod empty :default
[coll]
(clojure.core/empty coll))
;
; get
;
(defmulti get
"Returns the element of coll referred to by key. Each type of collection
can have specific restrictions on the possible keys."
{:arglists '([coll key] [coll key not-found])}
(fn [coll & args] (type coll)))
(defmethod get :default
([coll key]
(clojure.core/get coll key))
([coll key not-found]
(clojure.core/get coll key not-found)))
;
; into
;
(defmulti into
"Returns a new coll consisting of to-coll with all of the items of
from-coll conjoined."
{:arglists '([to from])}
(fn [to from] (type to)))
(declare seq)
(defmethod into :default
[to from]
(reduce conj to (seq from)))
;
; seq
;
(defmulti seq
"Returns a seq on the object s."
{:arglists '([s])}
type)
(defmethod seq :default
[s]
(clojure.core/seq s))
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