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utils.clj
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utils.clj
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(ns s-html.utils
"Useful utilities for handling S-HTML datastructures."
(:require [clojure.set :refer [difference intersection union]]))
(defn- settify [value]
(cond (nil? value) #{}
(coll? value) (into #{} value)
:else #{value}))
(defn- union-values [a b]
(-> (union (settify a)
(settify b))
seq
sort))
(defn add-attr
"Adds all `values` to the `tag`'s `attribute`."
[tag attribute & values]
(update-in tag [:attrs attribute]
(partial union-values values)))
(defn- diff-values [a b]
(-> (difference (settify a)
(settify b))
seq
sort))
(defn- dissoc-in [m [k & ks]]
(if ks
(assoc m k (dissoc-in (m k) ks))
(dissoc m k)))
(defn attr
"Returns `tags`'s `attribute` value."
[tag attribute]
(get-in tag [:attrs attribute]))
(defn remove-attr
"Removes all `values` from `tag`'s `attribute`."
[tag attribute & values]
(let [a (attr tag attribute)
d (diff-values a values)]
(if (empty? d)
(dissoc-in tag [:attrs attribute])
(assoc-in tag [:attrs attribute] d))))
(defn has-attr
"Checks wether `tag`'s `attribute` contains all `values`."
[tag attribute & values]
(let [a (attr tag attribute)
sv (settify values)]
(= (intersection (settify a) sv)
sv)))
(defn add-class
"Adds all classes in `cs` to the `tag`'s `:class` attribute."
[tag & cs]
(apply add-attr tag :class cs))
(defn remove-class
"Removes all classes in `cs` from `tag`'s `:class` attribute."
[tag & cs]
(apply remove-attr tag :class cs))
(defn has-class
"Checks wether `tag`'s `:class` attribute contains all classes in `cs`."
[tag & cs]
(apply has-attr tag :class cs))