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(ns weepinbell.metadata.microformats
"Microformats parser that converts a microformats map to a JF2 equivalent.
This namespace also contains utilities for handling microformats."
(:require [weepinbell.utils.url :refer [normalize]]
[weepinbell.metadata.jf2-spec]))
(defn- get-key [data k]
(cond
(not (map? data)) nil
(contains? data k) (get data k)
(keyword? k) (get data (name k))
(string? k) (get data (keyword k))
:else nil))
(defn- has-key? [data k]
(cond
(not (map? data)) false
(contains? data k) true
(keyword? k) (contains? data (name k))
(string? k) (contains? data (keyword k))
:else false))
(defn- first-value [value]
(if (and (coll? value) (not (map? value)))
(first value)
value))
(defn- type-vector [item]
(let [t (get-key item :type)]
(cond
(nil? t) []
(coll? t) t
(string? t) [t]
(keyword? t) [(name t)]
:else [t])))
(defn use-items [data]
(cond
(not (coll? data)) nil
(empty? data) nil
(has-key? data :items) (get-key data :items)
(sequential? data) data
(has-key? data :type) [data]
:else nil))
(defn use-prop-all [property data]
(cond
(not (map? data)) nil
(has-key? data :properties) (get-key (get-key data :properties) property)
(has-key? data property) (get-key data property)
:else nil))
(defn use-prop [property data]
(first-value (use-prop-all property data)))
(defn find-type [mftype items]
(concat (filter #(some #{mftype} (type-vector %)) items)
(mapcat #(find-type mftype (:children %)) items)))
(def find-h-entries (partial find-type "h-entry"))
(def find-h-cards (partial find-type "h-card"))
(defn find-h-entry [items]
(-> items find-h-entries first))
(defn find-h-card [items]
(-> items find-h-cards first))
(defn search-photo [node]
(if-let [photo (use-prop :photo node)]
(if (map? photo) (get-key photo :value) photo)
(let [author-photo (when-let [card (use-prop :author node)]
(search-photo card))]
(if author-photo author-photo
(when-let [card (use-prop :org node)]
(search-photo card))))))
(defn- assoc-wm-property
"Associate like-of, in-reply-to, repost-of and rsvp properties
to J2F base map, and add an additional :wm-property key."
[base h-entry]
(let [data (select-keys (:properties h-entry)
[:like-of :repost-of :in-reply-to :rsvp])
props (keys data)]
(if (empty? props)
(assoc base :wm-property :mention)
(-> base (merge data) (assoc :wm-property (first props))))))
(defn- assoc-content
"Associate content and sumary to J2F base map."
[base h-entry]
(let [content (use-prop :content h-entry)
summary (use-prop :summary h-entry)
get-value (fn [data]
;; convert microformats "content.value"
;; to JF2 "content.text", weirdly necessary
(if (and (map? data) (:value data))
(dissoc (assoc data :text (:value data)) :value)
data))]
(cond-> base
content (assoc :content (get-value content))
summary (assoc :summary (get-value summary)))))
(defn- assoc-author
"Associate author map to J2F base map."
[base h-card photo]
(let [author {:type "card"
:name (use-prop :name h-card)
:url (normalize (use-prop :url h-card))}
author (if photo
(assoc author :photo photo)
author)]
(assoc base :author author)))
(defn parse-microformats
"Convert microformats h-entry to JF2 format/"
[mf]
{:pre [(coll? mf)]}
(let [items (use-items mf)
entry (find-h-entry items)
card (find-h-card items)
author (or (use-prop :author entry) card)
photo (or (search-photo author)
(search-photo card))
base {:type "entry"
:name (use-prop :name entry)
:url (let [raw-url (use-prop :url entry)]
(normalize
(if (map? raw-url) (:value raw-url) raw-url)))
:published (use-prop :published entry)}]
(-> base
(assoc-author author photo)
(assoc-content entry)
(assoc-wm-property entry))))
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