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core.cljs
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core.cljs
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; 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.
(ns cljs.core
(:require [goog.string :as gstring]
[goog.string.StringBuffer :as gstringbuf]
[goog.string.format]
[goog.object :as gobject]
[goog.array :as garray]))
(def *unchecked-if* false)
(def
^{:doc "Each runtime environment provides a diffenent way to print output.
Whatever function *print-fn* is bound to will be passed any
Strings which should be printed." :dynamic true}
*print-fn*
(fn [_]
(throw (js/Error. "No *print-fn* fn set for evaluation environment"))))
(def
^{:doc "bound in a repl thread to the most recent value printed"}
*1)
(def
^{:doc "bound in a repl thread to the second most recent value printed"}
*2)
(def
^{:doc "bound in a repl thread to the third most recent value printed"}
*3)
(defn truth_
"Internal - do not use!"
[x]
(js* "(~{x} != null && ~{x} !== false)"))
(defn ^boolean identical?
"Tests if 2 arguments are the same object"
[x y]
(cljs.core/identical? x y))
(defn ^boolean nil?
"Returns true if x is nil, false otherwise."
[x]
(coercive-= x nil))
(defn ^boolean not
"Returns true if x is logical false, false otherwise."
[x] (if x false true))
(set! *unchecked-if* true)
(defn ^boolean type_satisfies_
"Internal - do not use!"
[p x]
(let [x (if (nil? x) nil x)]
(cond
(aget p (goog.typeOf x)) true
(aget p "_") true
:else false)))
(set! *unchecked-if* false)
(defn is_proto_
[x]
(identical? (.-prototype (.-constructor x)) x))
(def
^{:doc "When compiled for a command-line target, whatever
function *main-fn* is set to will be called with the command-line
argv as arguments"}
*main-cli-fn* nil)
(defn missing-protocol [proto obj]
(js/Error
(.join (array "No protocol method " proto
" defined for type " (goog/typeOf obj) ": " obj) "")))
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; arrays ;;;;;;;;;;;;;;;;
(defn aclone
"Returns a javascript array, cloned from the passed in array"
[array-like]
(.slice array-like))
(defn array
"Creates a new javascript array.
@param {...*} var_args" ;;array is a special case, don't emulate this doc string
[var-args] ;; [& items]
(.call (.-slice (.-prototype js/Array)) (js* "arguments")))
(defn make-array
([size]
(js/Array. size))
([type size]
(make-array size)))
(declare apply)
(defn aget
"Returns the value at the index."
([array i]
(cljs.core/aget array i))
([array i & idxs]
(apply aget (aget array i) idxs)))
(defn aset
"Sets the value at the index."
[array i val]
(cljs.core/aset array i val))
(defn alength
"Returns the length of the array. Works on arrays of all types."
[array]
(cljs.core/alength array))
(declare reduce)
(defn into-array
([aseq]
(into-array nil aseq))
([type aseq]
(reduce (fn [a x] (.push a x) a) (array) aseq)))
;;;;;;;;;;;;;;;;;;;;;;;;;;; core protocols ;;;;;;;;;;;;;
(defprotocol IFn
(-invoke
[this]
[this a]
[this a b]
[this a b c]
[this a b c d]
[this a b c d e]
[this a b c d e f]
[this a b c d e f g]
[this a b c d e f g h]
[this a b c d e f g h i]
[this a b c d e f g h i j]
[this a b c d e f g h i j k]
[this a b c d e f g h i j k l]
[this a b c d e f g h i j k l m]
[this a b c d e f g h i j k l m n]
[this a b c d e f g h i j k l m n o]
[this a b c d e f g h i j k l m n o p]
[this a b c d e f g h i j k l m n o p q]
[this a b c d e f g h i j k l m n o p q s]
[this a b c d e f g h i j k l m n o p q s t]
[this a b c d e f g h i j k l m n o p q s t rest]))
(defprotocol ICounted
(-count [coll] "constant time count"))
(defprotocol IEmptyableCollection
(-empty [coll]))
(defprotocol ICollection
(-conj [coll o]))
#_(defprotocol IOrdinal
(-index [coll]))
(defprotocol IIndexed
(-nth [coll n] [coll n not-found]))
(defprotocol ASeq)
(defprotocol ISeq
(-first [coll])
(-rest [coll]))
(defprotocol INext
(-next [coll]))
(defprotocol ILookup
(-lookup [o k] [o k not-found]))
(defprotocol IAssociative
(-contains-key? [coll k])
#_(-entry-at [coll k])
(-assoc [coll k v]))
(defprotocol IMap
#_(-assoc-ex [coll k v])
(-dissoc [coll k]))
(defprotocol IMapEntry
(-key [coll])
(-val [coll]))
(defprotocol ISet
(-disjoin [coll v]))
(defprotocol IStack
(-peek [coll])
(-pop [coll]))
(defprotocol IVector
(-assoc-n [coll n val]))
(defprotocol IDeref
(-deref [o]))
(defprotocol IDerefWithTimeout
(-deref-with-timeout [o msec timeout-val]))
(defprotocol IMeta
(-meta [o]))
(defprotocol IWithMeta
(-with-meta [o meta]))
(defprotocol IReduce
(-reduce [coll f] [coll f start]))
(defprotocol IKVReduce
(-kv-reduce [coll f init]))
(defprotocol IEquiv
(-equiv [o other]))
(defprotocol IHash
(-hash [o]))
(defprotocol ISeqable
(-seq [o]))
(defprotocol ISequential
"Marker interface indicating a persistent collection of sequential items")
(defprotocol IList
"Marker interface indicating a persistent list")
(defprotocol IRecord
"Marker interface indicating a record object")
(defprotocol IReversible
(-rseq [coll]))
(defprotocol ISorted
(-sorted-seq [coll ascending?])
(-sorted-seq-from [coll k ascending?])
(-entry-key [coll entry])
(-comparator [coll]))
(defprotocol ^:deprecated IPrintable
"Do not use this. It is kept for backwards compatibility with existing
user code that depends on it, but it has been superceded by IPrintWithWriter
User code that depends on this should be changed to use -pr-writer instead."
(-pr-seq [o opts]))
(defprotocol IWriter
(-write [writer s])
(-flush [writer]))
(defprotocol IPrintWithWriter
"The old IPrintable protocol's implementation consisted of building a giant
list of strings to concatenate. This involved lots of concat calls,
intermediate vectors, and lazy-seqs, and was very slow in some older JS
engines. IPrintWithWriter implements printing via the IWriter protocol, so it
be implemented efficiently in terms of e.g. a StringBuffer append."
(-pr-writer [o writer opts]))
(defprotocol IPending
(-realized? [d]))
(defprotocol IWatchable
(-notify-watches [this oldval newval])
(-add-watch [this key f])
(-remove-watch [this key]))
(defprotocol IEditableCollection
(-as-transient [coll]))
(defprotocol ITransientCollection
(-conj! [tcoll val])
(-persistent! [tcoll]))
(defprotocol ITransientAssociative
(-assoc! [tcoll key val]))
(defprotocol ITransientMap
(-dissoc! [tcoll key]))
(defprotocol ITransientVector
(-assoc-n! [tcoll n val])
(-pop! [tcoll]))
(defprotocol ITransientSet
(-disjoin! [tcoll v]))
(defprotocol IComparable
(-compare [x y]))
(defprotocol IChunk
(-drop-first [coll]))
(defprotocol IChunkedSeq
(-chunked-first [coll])
(-chunked-rest [coll]))
(defprotocol IChunkedNext
(-chunked-next [coll]))
;;;;;;;;;;;;;;;;;;; fundamentals ;;;;;;;;;;;;;;;
(defn ^seq seq
"Returns a seq on the collection. If the collection is
empty, returns nil. (seq nil) returns nil. seq also works on
Strings."
[coll]
(when-not (nil? coll)
(if (satisfies? ASeq coll)
coll
(-seq coll))))
(defn first
"Returns the first item in the collection. Calls seq on its
argument. If coll is nil, returns nil."
[coll]
(when-not (nil? coll)
(if (satisfies? ISeq coll)
(-first coll)
(let [s (seq coll)]
(when-not (nil? s)
(-first s))))))
(defn ^seq rest
"Returns a possibly empty seq of the items after the first. Calls seq on its
argument."
[coll]
(if-not (nil? coll)
(if (satisfies? ISeq coll)
(-rest coll)
(let [s (seq coll)]
(if-not (nil? s)
(-rest s)
())))
()))
(defn ^seq next
"Returns a seq of the items after the first. Calls seq on its
argument. If there are no more items, returns nil"
[coll]
(when-not (nil? coll)
(if (satisfies? INext coll)
(-next coll)
(seq (rest coll)))))
(defn ^boolean =
"Equality. Returns true if x equals y, false if not. Compares
numbers and collections in a type-independent manner. Clojure's immutable data
structures define -equiv (and thus =) as a value, not an identity,
comparison."
([x] true)
([x y] (or (identical? x y) (-equiv x y)))
([x y & more]
(if (= x y)
(if (next more)
(recur y (first more) (next more))
(= y (first more)))
false)))
(defn type [x]
(when-not (nil? x)
(.-constructor x)))
(defn ^boolean instance? [t o]
(js* "(~{o} instanceof ~{t})"))
;;;;;;;;;;;;;;;;;;; protocols on primitives ;;;;;;;;
(declare hash-map list equiv-sequential)
(extend-type nil
IEquiv
(-equiv [_ o] (nil? o))
ICounted
(-count [_] 0)
IEmptyableCollection
(-empty [_] nil)
ICollection
(-conj [_ o] (list o))
^:deprecation-nowarn IPrintable
(-pr-seq [o] (list "nil"))
IPrintWithWriter
(-pr-writer [o writer _] (-write writer "nil"))
IIndexed
(-nth
([_ n] nil)
([_ n not-found] not-found))
ISeq
(-first [_] nil)
(-rest [_] (list))
INext
(-next [_] nil)
ILookup
(-lookup
([o k] nil)
([o k not-found] not-found))
IAssociative
(-assoc [_ k v] (hash-map k v))
IMap
(-dissoc [_ k] nil)
ISet
(-disjoin [_ v] nil)
IStack
(-peek [_] nil)
(-pop [_] nil)
IMeta
(-meta [_] nil)
IWithMeta
(-with-meta [_ meta] nil)
IReduce
(-reduce
([_ f] (f))
([_ f start] start))
IHash
(-hash [o] 0))
(extend-type js/Date
IEquiv
(-equiv [o other]
(and (instance? js/Date other)
(identical? (.toString o) (.toString other)))))
(extend-type number
IEquiv
(-equiv [x o] (identical? x o))
IHash
(-hash [o] o))
(extend-type boolean
IHash
(-hash [o]
(if (identical? o true) 1 0)))
(extend-type default
IHash
(-hash [o]
(goog.getUid o)))
;;this is primitive because & emits call to array-seq
(defn inc
"Returns a number one greater than num."
[x] (cljs.core/+ x 1))
(declare deref)
(deftype Reduced [val]
IDeref
(-deref [o] val))
(defn reduced
"Wraps x in a way such that a reduce will terminate with the value x"
[x]
(Reduced. x))
(defn ^boolean reduced?
"Returns true if x is the result of a call to reduced"
[r]
(instance? Reduced r))
(defn- ci-reduce
"Accepts any collection which satisfies the ICount and IIndexed protocols and
reduces them without incurring seq initialization"
([cicoll f]
(let [cnt (-count cicoll)]
(if (zero? cnt)
(f)
(loop [val (-nth cicoll 0), n 1]
(if (< n cnt)
(let [nval (f val (-nth cicoll n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val)))))
([cicoll f val]
(let [cnt (-count cicoll)]
(loop [val val, n 0]
(if (< n cnt)
(let [nval (f val (-nth cicoll n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val))))
([cicoll f val idx]
(let [cnt (-count cicoll)]
(loop [val val, n idx]
(if (< n cnt)
(let [nval (f val (-nth cicoll n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val)))))
(defn- array-reduce
([arr f]
(let [cnt (alength arr)]
(if (zero? (alength arr))
(f)
(loop [val (aget arr 0), n 1]
(if (< n cnt)
(let [nval (f val (aget arr n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val)))))
([arr f val]
(let [cnt (alength arr)]
(loop [val val, n 0]
(if (< n cnt)
(let [nval (f val (aget arr n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val))))
([arr f val idx]
(let [cnt (alength arr)]
(loop [val val, n idx]
(if (< n cnt)
(let [nval (f val (aget arr n))]
(if (reduced? nval)
@nval
(recur nval (inc n))))
val)))))
(declare hash-coll cons pr-str RSeq)
(defn ^boolean counted?
"Returns true if coll implements count in constant time"
[x] (satisfies? ICounted x))
(defn ^boolean indexed?
"Returns true if coll implements nth in constant time"
[x] (satisfies? IIndexed x))
(deftype IndexedSeq [a i]
Object
(toString [this]
(pr-str this))
ISeqable
(-seq [this] this)
ASeq
ISeq
(-first [_] (aget a i))
(-rest [_] (if (< (inc i) (alength a))
(IndexedSeq. a (inc i))
(list)))
INext
(-next [_] (if (< (inc i) (alength a))
(IndexedSeq. a (inc i))
nil))
ICounted
(-count [_] (- (alength a) i))
IIndexed
(-nth [coll n]
(let [i (+ n i)]
(when (< i (alength a))
(aget a i))))
(-nth [coll n not-found]
(let [i (+ n i)]
(if (< i (alength a))
(aget a i)
not-found)))
ISequential
IEquiv
(-equiv [coll other] (equiv-sequential coll other))
ICollection
(-conj [coll o] (cons o coll))
IEmptyableCollection
(-empty [coll] cljs.core.List/EMPTY)
IReduce
(-reduce [coll f]
(if (counted? a)
(ci-reduce a f (aget a i) (inc i))
(ci-reduce coll f (aget a i) 0)))
(-reduce [coll f start]
(if (counted? a)
(ci-reduce a f start i)
(ci-reduce coll f start 0)))
IHash
(-hash [coll] (hash-coll coll))
IReversible
(-rseq [coll]
(let [c (-count coll)]
(if (pos? c)
(RSeq. coll (dec c) nil)
()))))
(defn prim-seq
([prim]
(prim-seq prim 0))
([prim i]
(when (< i (alength prim))
(IndexedSeq. prim i))))
(defn array-seq
([array]
(prim-seq array 0))
([array i]
(prim-seq array i)))
(extend-type array
ISeqable
(-seq [array] (array-seq array 0))
ICounted
(-count [a] (alength a))
IIndexed
(-nth
([array n]
(if (< n (alength array)) (aget array n)))
([array n not-found]
(if (< n (alength array)) (aget array n)
not-found)))
ILookup
(-lookup
([array k]
(aget array k))
([array k not-found]
(-nth array k not-found)))
IReduce
(-reduce
([array f]
(ci-reduce array f))
([array f start]
(ci-reduce array f start))))
(declare with-meta)
(deftype RSeq [ci i meta]
Object
(toString [this]
(pr-str this))
IMeta
(-meta [coll] meta)
IWithMeta
(-with-meta [coll new-meta]
(RSeq. ci i new-meta))
ISeqable
(-seq [coll] coll)
ISequential
IEquiv
(-equiv [coll other] (equiv-sequential coll other))
ISeq
(-first [coll]
(-nth ci i))
(-rest [coll]
(if (pos? i)
(RSeq. ci (dec i) nil)
()))
ICounted
(-count [coll] (inc i))
ICollection
(-conj [coll o]
(cons o coll))
IEmptyableCollection
(-empty [coll] (with-meta cljs.core.List/EMPTY meta))
IHash
(-hash [coll] (hash-coll coll)))
(defn second
"Same as (first (next x))"
[coll]
(first (next coll)))
(defn ffirst
"Same as (first (first x))"
[coll]
(first (first coll)))
(defn nfirst
"Same as (next (first x))"
[coll]
(next (first coll)))
(defn fnext
"Same as (first (next x))"
[coll]
(first (next coll)))
(defn nnext
"Same as (next (next x))"
[coll]
(next (next coll)))
(defn last
"Return the last item in coll, in linear time"
[s]
(let [sn (next s)]
(if-not (nil? sn)
(recur sn)
(first s))))
(extend-type default
IEquiv
(-equiv [x o] (identical? x o)))
(defn conj
"conj[oin]. Returns a new collection with the xs
'added'. (conj nil item) returns (item). The 'addition' may
happen at different 'places' depending on the concrete type."
([coll x]
(-conj coll x))
([coll x & xs]
(if xs
(recur (conj coll x) (first xs) (next xs))
(conj coll x))))
(defn empty
"Returns an empty collection of the same category as coll, or nil"
[coll]
(-empty coll))
(defn- accumulating-seq-count [coll]
(loop [s (seq coll) acc 0]
(if (counted? s) ; assumes nil is counted, which it currently is
(+ acc (-count s))
(recur (next s) (inc acc)))))
(defn count
"Returns the number of items in the collection. (count nil) returns
0. Also works on strings, arrays, and Maps"
[coll]
(if (counted? coll)
(-count coll)
(accumulating-seq-count coll)))
(defn- linear-traversal-nth
([coll n]
(cond
(nil? coll) (throw (js/Error. "Index out of bounds"))
(zero? n) (if (seq coll)
(first coll)
(throw (js/Error. "Index out of bounds")))
(indexed? coll) (-nth coll n)
(seq coll) (recur (next coll) (dec n))
:else (throw (js/Error. "Index out of bounds"))))
([coll n not-found]
(cond
(nil? coll) not-found
(zero? n) (if (seq coll)
(first coll)
not-found)
(indexed? coll) (-nth coll n not-found)
(seq coll) (recur (next coll) (dec n) not-found)
:else not-found)))
(defn nth
"Returns the value at the index. get returns nil if index out of
bounds, nth throws an exception unless not-found is supplied. nth
also works for strings, arrays, regex Matchers and Lists, and,
in O(n) time, for sequences."
([coll n]
(when-not (nil? coll)
(if (satisfies? IIndexed coll)
(-nth coll (.floor js/Math n))
(linear-traversal-nth coll (.floor js/Math n)))))
([coll n not-found]
(if-not (nil? coll)
(if (satisfies? IIndexed coll)
(-nth coll (.floor js/Math n) not-found)
(linear-traversal-nth coll (.floor js/Math n) not-found))
not-found)))
(defn get
"Returns the value mapped to key, not-found or nil if key not present."
([o k]
(-lookup o k))
([o k not-found]
(-lookup o k not-found)))
(defn assoc
"assoc[iate]. When applied to a map, returns a new map of the
same (hashed/sorted) type, that contains the mapping of key(s) to
val(s). When applied to a vector, returns a new vector that
contains val at index."
([coll k v]
(-assoc coll k v))
([coll k v & kvs]
(let [ret (assoc coll k v)]
(if kvs
(recur ret (first kvs) (second kvs) (nnext kvs))
ret))))
(defn dissoc
"dissoc[iate]. Returns a new map of the same (hashed/sorted) type,
that does not contain a mapping for key(s)."
([coll] coll)
([coll k]
(-dissoc coll k))
([coll k & ks]
(let [ret (dissoc coll k)]
(if ks
(recur ret (first ks) (next ks))
ret))))
(defn with-meta
"Returns an object of the same type and value as obj, with
map m as its metadata."
[o meta]
(-with-meta o meta))
(defn meta
"Returns the metadata of obj, returns nil if there is no metadata."
[o]
(when (satisfies? IMeta o)
(-meta o)))
(defn peek
"For a list or queue, same as first, for a vector, same as, but much
more efficient than, last. If the collection is empty, returns nil."
[coll]
(-peek coll))
(defn pop
"For a list or queue, returns a new list/queue without the first
item, for a vector, returns a new vector without the last item.
Note - not the same as next/butlast."
[coll]
(-pop coll))
(defn disj
"disj[oin]. Returns a new set of the same (hashed/sorted) type, that
does not contain key(s)."
([coll] coll)
([coll k]
(-disjoin coll k))
([coll k & ks]
(let [ret (disj coll k)]
(if ks
(recur ret (first ks) (next ks))
ret))))
;; Simple caching of string hashcode
(def string-hash-cache (js-obj))
(def string-hash-cache-count 0)
(defn add-to-string-hash-cache [k]
(let [h (goog.string/hashCode k)]
(aset string-hash-cache k h)
(set! string-hash-cache-count (inc string-hash-cache-count))
h))
(defn check-string-hash-cache [k]
(when (> string-hash-cache-count 255)
(set! string-hash-cache (js-obj))
(set! string-hash-cache-count 0))
(let [h (aget string-hash-cache k)]
(if-not (nil? h)
h
(add-to-string-hash-cache k))))
(defn hash
([o] (hash o true))
([o ^boolean check-cache]
(if (and ^boolean (goog/isString o) check-cache)
(check-string-hash-cache o)
(-hash o))))
(defn ^boolean empty?
"Returns true if coll has no items - same as (not (seq coll)).
Please use the idiom (seq x) rather than (not (empty? x))"
[coll] (or (nil? coll)
(not (seq coll))))
(defn ^boolean coll?
"Returns true if x satisfies ICollection"
[x]
(if (nil? x)
false
(satisfies? ICollection x)))
(defn ^boolean set?
"Returns true if x satisfies ISet"
[x]
(if (nil? x)
false
(satisfies? ISet x)))
(defn ^boolean associative?
"Returns true if coll implements Associative"
[x] (satisfies? IAssociative x))
(defn ^boolean sequential?
"Returns true if coll satisfies ISequential"
[x] (satisfies? ISequential x))
(defn ^boolean reduceable?
"Returns true if coll satisfies IReduce"
[x] (satisfies? IReduce x))
(defn ^boolean map?
"Return true if x satisfies IMap"
[x]
(if (nil? x)
false
(satisfies? IMap x)))
(defn ^boolean vector?
"Return true if x satisfies IVector"
[x] (satisfies? IVector x))
(defn ^boolean chunked-seq?
[x] (satisfies? IChunkedSeq x))
;;;;;;;;;;;;;;;;;;;; js primitives ;;;;;;;;;;;;
(defn js-obj
([]
(js* "{}"))
([& keyvals]
(apply gobject/create keyvals)))
(defn js-keys [obj]
(let [keys (array)]
(goog.object/forEach obj (fn [val key obj] (.push keys key)))
keys))
(defn js-delete [obj key]
(js* "delete ~{obj}[~{key}]"))
(defn- array-copy
([from i to j len]
(loop [i i j j len len]
(if (zero? len)
to
(do (aset to j (aget from i))
(recur (inc i) (inc j) (dec len)))))))
(defn- array-copy-downward
([from i to j len]
(loop [i (+ i (dec len)) j (+ j (dec len)) len len]
(if (zero? len)
to
(do (aset to j (aget from i))
(recur (dec i) (dec j) (dec len)))))))
;;;;;;;;;;;;;;;; preds ;;;;;;;;;;;;;;;;;;
(def ^:private lookup-sentinel (js-obj))
(defn ^boolean false?
"Returns true if x is the value false, false otherwise."
[x] (cljs.core/false? x))
(defn ^boolean true?
"Returns true if x is the value true, false otherwise."
[x] (cljs.core/true? x))
(defn ^boolean undefined? [x]
(cljs.core/undefined? x))
(defn ^boolean seq?
"Return true if s satisfies ISeq"
[s]
(if (nil? s)