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pom.xml | ||
pom.xml.asc | ||
*jar | ||
/lib/ | ||
/classes/ | ||
/target/ | ||
/checkouts/ | ||
.lein-deps-sum | ||
.lein-repl-history | ||
.lein-plugins/ | ||
.lein-failures |
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# clojung | ||
Deep introspection and transformation of data | ||
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# About | ||
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Clojung is a library for concisely querying and updating nested data structures. One way to think of it is "get-in" and "assoc-in" on steroids. It is similar to the concept of a "lens" in functional programming, though it has some important extensions. | ||
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# How to use | ||
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;; explain basic usage | ||
;; explain structurepath interface | ||
;; explain how structurepath can be extended (I've done it for working with directed acyclic graphs) | ||
- show implementations for ALL, VAL, LAST, etc. | ||
;; explain precompiling to make things far faster | ||
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From a sequence of maps get all the even values for :a keys: | ||
```clojure | ||
>>> (select [ALL :a even?] [{:a 1} {:a 2} {:a 4} {:a 3}]) | ||
[2 4] | ||
``` | ||
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In a sequence of maps increment all the even values for :a keys: | ||
>>> (update [ALL :a even?] inc [{:a 1} {:a 2} {:a 4} {:a 3}]) | ||
[{:a 1} {:a 3} {:a 5} {:a 3}] | ||
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Increment the last odd number in a sequence: | ||
```clojure | ||
>>> (update [(filterer odd?) LAST] inc [2 1 6 9 4 8]) | ||
[2 1 6 10 4 8] | ||
``` | ||
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For all maps in a sequence, add the value of :b key to the value of :a key, but only if the :a value is even: | ||
```clojure | ||
>>> (update [ALL (val-selector-one :b) :a even?] + [{:a 1 :b 3} {:a 2 :b -10} {:a 4 :b 10} {:a 3}]) | ||
[{:b 3, :a 1} {:b -10, :a -8} {:b 10, :a 14} {:a 3}] | ||
``` | ||
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# Future work | ||
;; parallelize the transformations | ||
;; any connection to transducers? |
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(defproject com.rpl/specter "0.0.2" | ||
:dependencies [[org.clojure/clojure "1.6.0"] | ||
] | ||
:jvm-opts ["-XX:-OmitStackTraceInFastThrow"] ; this prevents JVM from doing optimizations which can remove stack traces from NPE and other exceptions | ||
:source-paths ["src/clj"] | ||
:test-paths ["test/clj"] | ||
:profiles {:dev {:dependencies | ||
[[org.clojure/test.check "0.5.9"]]} | ||
}) |
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(ns com.rpl.specter | ||
(:use [com.rpl.specter impl protocols]) | ||
) | ||
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;;TODO: can make usage of vals much more efficient by determining during composition how many vals | ||
;;there are going to be. this should make it much easier to allocate space for vals without doing concats | ||
;;all over the place. The apply to the vals + structure can also be avoided since the number of vals is known | ||
;;beforehand | ||
(defn comp-structure-paths [& structure-paths] | ||
(comp-structure-paths* (vec structure-paths))) | ||
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;; Selector functions | ||
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(defn select [selector structure] | ||
(let [sp (comp-structure-paths* selector)] | ||
(select* sp | ||
[] | ||
structure | ||
(fn [vals structure] | ||
(if-not (empty? vals) [(conj vals structure)] [structure]))) | ||
)) | ||
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(defn select-one | ||
"Like select, but returns either one element or nil. Throws exception if multiple elements returned" | ||
[selector structure] | ||
(let [res (select selector structure)] | ||
(when (> (count res) 1) | ||
(throw-illegal "More than one element found for params: " selector structure)) | ||
(first res) | ||
)) | ||
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(defn select-one! | ||
"Returns exactly one element, throws exception if zero or multiple elements returned" | ||
[selector structure] | ||
(let [res (select-one selector structure)] | ||
(when (nil? res) (throw-illegal "No elements found for params: " selector structure)) | ||
res | ||
)) | ||
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(defn select-first | ||
"Returns first element returned. Not any more efficient than select, just a convenience" | ||
[selector structure] | ||
(first (select selector structure))) | ||
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;; Update functions | ||
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(defn update [selector update-fn structure] | ||
(let [selector (comp-structure-paths* selector)] | ||
(update* selector | ||
[] | ||
structure | ||
(fn [vals structure] | ||
(if (empty? vals) | ||
(update-fn structure) | ||
(apply update-fn (conj vals structure))) | ||
)))) | ||
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(defn replace-in [selector update-fn structure & {:keys [merge-fn] :or {merge-fn concat}}] | ||
"Returns [new structure [<user-ret> <user-ret>...]" | ||
(let [state (mutable-cell nil)] | ||
[(update selector | ||
(fn [e] | ||
(let [res (update-fn e)] | ||
(if res | ||
(let [[ret user-ret] res] | ||
(->> user-ret | ||
(merge-fn (get-cell state)) | ||
(set-cell! state)) | ||
ret) | ||
e | ||
))) | ||
structure) | ||
(get-cell state)] | ||
)) | ||
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;; Built-in pathing and context operations | ||
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(def ALL (->AllStructurePath)) | ||
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(def VAL (->ValStructurePath)) | ||
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(def LAST (->LastStructurePath)) | ||
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(def FIRST (->FirstStructurePath)) | ||
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(defn walker [afn] (->WalkerStructurePath afn)) | ||
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(defn codewalker [afn] (->CodeWalkerStructurePath afn)) | ||
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(defn filterer [afn] (->FilterStructurePath afn)) | ||
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(defn keypath [akey] (->KeyPath akey)) | ||
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(extend-type clojure.lang.Keyword | ||
StructurePath | ||
(select* [kw vals structure next-fn] | ||
(key-select kw vals structure next-fn)) | ||
(update* [kw vals structure next-fn] | ||
(key-update kw vals structure next-fn) | ||
)) | ||
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(extend-type clojure.lang.AFn | ||
StructurePath | ||
(select* [afn vals structure next-fn] | ||
(if (afn structure) | ||
(next-fn vals structure))) | ||
(update* [afn vals structure next-fn] | ||
(if (afn structure) | ||
(next-fn vals structure) | ||
structure))) | ||
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(defn val-selector [& selector] | ||
(->SelectorValsPath select (comp-structure-paths* selector))) | ||
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(defn val-selector-one [& selector] | ||
(->SelectorValsPath select-one (comp-structure-paths* selector))) |
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