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(ns microformats.parser
(:require [net.cgrand.enlive-html :as html]
[clojure.core.reducers :as r]
[clojure.string :as str]))
(defn mf-names-from-class
"Get microformat classnames from a class attribute"
[prefix]
#(.startsWith % prefix))
(defn remove-mf-prefix
"Remove microformats prefixes from a class attribute"
[prefix]
#(apply str (drop (count prefix) %)))
(defn- split-ws-attribute
"Split a whitespace-separated attribute."
[class]
(str/split class #"\s+"))
(defn classes-to-props
"Convert class list to list of microformat property keywords"
[prefix]
(comp (r/map keyword)
(r/map (remove-mf-prefix prefix))
(r/filter (mf-names-from-class prefix))))
(defn element-to-classes
"Get list of classes from an element"
[el] (some-> el
:attrs
:class
split-ws-attribute))
(defn element-to-rels
"Get list of rels from an element"
[el] (-> el
:attrs
:rel
split-ws-attribute))
(defn- node-to-html
"Turn a node into a list of HTML strings"
[el]
(map #(if (string? %)
%
(apply str (persistent! (html/emit-tag % (transient []))))) el))
(defn- node-to-text
"Turn a node into a text string"
[content]
(->> content
html/texts
(map #(str/replace % #"\s+" " "))
(apply str)
str/trim))
(defn get-value-class
"Get the value class of elements"
[elements]
(str/join " " (into [] ((comp (r/map (partial apply str))
(r/map node-to-text)
(r/map :content))
elements))))
(defn find-value-class
"Find and get the value class of elements"
[el]
(when-let [values (seq (html/select el [html/root :> :.value]))]
(get-value-class values)))
(defn get-p-value
"Get the p-x property value of an element"
[el]
(str/trim (or (find-value-class el)
(case (:tag el)
:img (-> el :attrs :alt)
:area (-> el :attrs :alt)
:abbr (-> el :attrs :title)
:data (-> el :attrs :value)
:input (-> el :attrs :value)
nil)
(node-to-text (:content el))
"")))
(defn get-u-value
"Get the u-x property value of an element"
[el]
(str/trim (or (find-value-class el)
(case (:tag el)
:a (-> el :attrs :href)
:area (-> el :attrs :href)
:img (-> el :attrs :src)
:object (-> el :attrs :data)
(get-p-value el))
(node-to-text (:content el))
"")))
(defn get-dt-value
"Get the dt-x property value of an element"
[el]
(str/trim (or (find-value-class el)
(case (:tag el)
:time (-> el :attrs :datetime)
:ins (-> el :attrs :datetime)
:del (-> el :attrs :datetime)
:abbr (-> el :attrs :title)
:data (-> el :attrs :value)
:input (-> el :attrs :value))
(node-to-text (:content el))
"")))
(defn get-e-value
"Get the e-x propery value of an element"
[el]
(let [content (:content el)]
(list {:html (apply str (node-to-html content))
:value (apply str (node-to-text content))})))
(defn parse-p
"Parse p-* classes within HTML element."
[element]
(->> element
element-to-classes
((classes-to-props "p-"))
(r/map #(hash-map % (list (get-p-value element))))
(into {})))
(defn parse-u
"Parse u-* classes within HTML element"
[element]
(->> element
element-to-classes
((classes-to-props "u-"))
(r/map #(hash-map % (list (get-u-value element))))
(into {})))
(defn parse-dt
"Parse dt-* classes within HTML element"
[element]
(->> element
element-to-classes
((classes-to-props "dt-"))
(r/map #(hash-map % (list (get-dt-value element))))
(into {})))
(defn parse-e
"Parse e-* classes within HTML element"
[element]
(->> element
element-to-classes
((classes-to-props "e-"))
(r/map #(hash-map % (get-e-value element)))
(into {})))
(defn- get-mf-names
"Get the microformat names from an element"
[element]
(->> element
element-to-classes
(r/filter (mf-names-from-class "h-"))
(into [])))
(defn- imply-name
"Imply the name of an entity from the element"
[element]
(list (node-to-text (:content element))))
(defn parse-implied
"Parse implied properties of a HTML element"
[element]
{:name (imply-name element)})
(defn parse-h
"Parse h-* classes within a HTML element."
[element]
(let [el (first (html/select element [(html/union [(html/attr-starts :class "p-")
(html/attr-starts :class "u-")
(html/attr-starts :class "dt-")
(html/attr-starts :class "e-")])]))]
(hash-map :type (get-mf-names element)
:properties (merge (parse-implied element)
(apply merge ((juxt parse-p parse-u parse-dt parse-e) el))))))
(defn select-h
"Select h-* elements within a HTML document."
[element]
(html/select element [(html/attr-starts :class "h-")]))
(defn parse-rel
"Parse rel attributes of an HTML link element"
[element]
(->> element
element-to-rels
(map keyword)
(map #(hash-map % [(-> element :attrs :href)]))
(into {})))
(defn select-rels
"Select linking HTML elements with rel attributes"
[html] (html/select html [[#{:a :link} (html/attr? :rel)]]))
(defn parse-rels
"Parse rel attibutes of a set of HTML link elements"
[elements]
(or (apply merge-with into (map parse-rel (select-rels elements))) {}))
(defn parse
"Parse a HTML string with microformats"
[html]
(let [document (html/html-snippet html)]
{:items (mapv parse-h (select-h document)) :rels (parse-rels document)}))
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