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template.cljs
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template.cljs
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(ns reagent.impl.template
(:require [clojure.string :as string]
[reagent.impl.util :as util :refer [is-client]]
[reagent.impl.component :as comp]
[reagent.impl.batching :as batch]
[reagent.ratom :as ratom]
[reagent.interop :refer-macros [.' .!]]
[reagent.debug :refer-macros [dbg prn println log dev?]]))
;; From Weavejester's Hiccup, via pump:
(def ^{:doc "Regular expression that parses a CSS-style id and class
from a tag name."}
re-tag #"([^\s\.#]+)(?:#([^\s\.#]+))?(?:\.([^\s#]+))?")
(def attr-aliases {:class "className"
:for "htmlFor"
:charset "charSet"})
;;; Common utilities
(defn hiccup-tag? [x]
(or (keyword? x)
(symbol? x)
(string? x)))
(defn valid-tag? [x]
(or (hiccup-tag? x)
(util/clj-ifn? x)))
(defn to-js-val [v]
(cond
(string? v) v
(number? v) v
(keyword? v) (name v)
(symbol? v) (str v)
(coll? v) (clj->js v)
(ifn? v) (fn [& args] (apply v args))
:else v))
(defn undash-prop-name [n]
(or (attr-aliases n)
(util/dash-to-camel n)))
;;; Props conversion
(def cached-prop-name (util/memoize-1 undash-prop-name))
(def cached-style-name (util/memoize-1 util/dash-to-camel))
(defn convert-prop-value [x]
(cond (string? x) x
(number? x) x
(map? x) (reduce-kv (fn [o k v]
(doto o
(aset (cached-prop-name k)
(to-js-val v))))
#js{} x)
:else (to-js-val x)))
(defn set-id-class [props [id class]]
(let [pid (.' props :id)]
(.! props :id (if-not (nil? pid) pid id))
(when-not (nil? class)
(let [old (.' props :className)]
(.! props :className (if-not (nil? old)
(str class " " old)
class))))))
(defn convert-props [props id-class]
(cond
(and (empty? props) (nil? id-class)) nil
(identical? (type props) js/Object) props
:else (let [objprops
(reduce-kv (fn [o k v]
(let [pname (cached-prop-name k)]
(if-not (identical? pname "key")
;; Skip key, it is set by parent
(aset o pname (convert-prop-value v))))
o)
#js{} props)]
(when-not (nil? id-class)
(set-id-class objprops id-class))
objprops)))
;;; Specialization for input components
(defn input-handle-change [this on-change e]
(let [res (on-change e)]
;; Make sure the input is re-rendered, in case on-change
;; wants to keep the value unchanged
(batch/queue-render this)
res))
(defn input-did-update [this]
(let [value (.' this :cljsInputValue)]
(when-not (nil? value)
(let [node (.' this getDOMNode)]
(when (not= value (.' node :value))
(.! node :value value))))))
(defn input-render-setup [this jsprops]
;; Don't rely on React for updating "controlled inputs", since it
;; doesn't play well with async rendering (misses keystrokes).
(let [on-change (.' jsprops :onChange)
value (when-not (nil? on-change)
(.' jsprops :value))]
(.! this :cljsInputValue value)
(when-not (nil? value)
(batch/mark-rendered this)
(doto jsprops
(.! :defaultValue value)
(.! :value nil)
(.! :onChange #(input-handle-change this on-change %))))))
(defn input-component? [x]
(let [DOM (.' js/React :DOM)]
(or (= x "input")
(= x "textarea")
(identical? x (.' DOM :input))
(identical? x (.' DOM :textarea)))))
;;; Wrapping of native components
(declare make-element)
(defn wrapped-render [this comp id-class input-setup]
(let [inprops (.' this :props)
argv (.' inprops :argv)
props (nth argv 1 nil)
hasprops (or (nil? props) (map? props))
jsprops (convert-props (if hasprops props) id-class)]
(when-not (nil? input-setup)
(input-setup this jsprops))
(make-element argv comp jsprops
(if hasprops 2 1)
(inc (.' inprops :level)))))
(defn wrapped-should-update [c nextprops nextstate]
(or util/*always-update*
(let [a1 (.' c :props.argv)
a2 (.' nextprops :argv)]
(not (util/equal-args a1 a2)))))
(defn add-input-methods [spec]
(doto spec
(.! :componentDidUpdate #(this-as c (input-did-update c)))
(.! :componentWillUnmount #(this-as c (batch/dispose c)))))
(defn wrap-component [comp extras name]
(let [input? (input-component? comp)
input-setup (if input? input-render-setup)
spec #js{:render
#(this-as C (wrapped-render C comp extras input-setup))
:shouldComponentUpdate
#(this-as C (wrapped-should-update C %1 %2))
:displayName (or name "ComponentWrapper")}]
(when input?
(add-input-methods spec))
(.' js/React createClass spec)))
;;; Conversion from Hiccup forms
(defn parse-tag [hiccup-tag]
(let [[tag id class] (->> hiccup-tag name (re-matches re-tag) next)
class' (when class
(string/replace class #"\." " "))]
(assert tag (str "Unknown tag: '" hiccup-tag "'"))
[tag (when (or id class')
[id class'])]))
(defn get-wrapper [tag]
(let [[comp id-class] (parse-tag tag)]
(wrap-component comp id-class (str tag))))
(def cached-wrapper (util/memoize-1 get-wrapper))
(declare create-class)
(defn fn-to-class [f]
(let [spec (meta f)
withrender (assoc spec :component-function f)
res (create-class withrender)
wrapf (util/cached-react-class res)]
(util/cache-react-class f wrapf)
wrapf))
(defn as-class [tag]
(if (hiccup-tag? tag)
(cached-wrapper tag)
(let [cached-class (util/cached-react-class tag)]
(if-not (nil? cached-class)
cached-class
(if (.' js/React isValidElement tag)
(util/cache-react-class tag (wrap-component tag nil nil))
(fn-to-class tag))))))
(defn get-key [x]
(when (map? x) (get x :key)))
(defn vec-to-comp [v level]
(assert (pos? (count v)) "Hiccup form should not be empty")
(assert (valid-tag? (nth v 0))
(str "Invalid Hiccup form: " (pr-str v)))
(let [c (as-class (nth v 0))
jsprops #js{:argv v
:level level}]
(let [k (-> v meta get-key)
k' (if (nil? k)
(-> v (nth 1 nil) get-key)
k)]
(when-not (nil? k')
(.! jsprops :key k')))
(.' js/React createElement c jsprops)))
(def seq-ctx #js{})
(defn warn-on-deref [x]
(when-not (.' seq-ctx :warned)
(log "Warning: Reactive deref not supported in seq in "
(pr-str x))
(.! seq-ctx :warned true)))
(declare expand-seq)
(defn as-component
([x] (as-component x 0))
([x level]
(cond (string? x) x
(vector? x) (vec-to-comp x level)
(seq? x) (if (dev?)
(if (nil? ratom/*ratom-context*)
(expand-seq x level)
(let [s (ratom/capture-derefed
#(expand-seq x level)
seq-ctx)]
(when (ratom/captured seq-ctx)
(warn-on-deref x))
s))
(expand-seq x level))
true x)))
(defn create-class [spec]
(comp/create-class spec as-component))
(defn expand-seq [s level]
(let [a (into-array s)
level' (inc level)]
(dotimes [i (alength a)]
(aset a i (as-component (aget a i) level')))
a))
(defn make-element [argv comp jsprops first-child level]
(if (== (count argv) (inc first-child))
;; Optimize common case of one child
(.' js/React createElement comp jsprops
(as-component (nth argv first-child) level))
(.apply (.' js/React :createElement) nil
(reduce-kv (fn [a k v]
(when (>= k first-child)
(.push a (as-component v level)))
a)
#js[comp jsprops] argv))))