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; Copyright (c) Rich Hickey. All rights reserved.
; The use and distribution terms for this software are covered by the
; Common Public License 1.0 (http://opensource.org/licenses/cpl.php)
; which can be found in the file CPL.TXT at the root of this distribution.
; By using this software in any fashion, you are agreeing to be bound by
; the terms of this license.
; You must not remove this notice, or any other, from this software.
(in-ns 'xml)
(clojure/refer 'clojure)
(import '(org.xml.sax ContentHandler Attributes SAXException)
'(javax.xml.parsers SAXParser SAXParserFactory))
(def *stack*)
(def *current*)
(def *state*) ; :element :chars :between
(def *sb*)
(defstruct element :tag :attrs :content)
(def tag (accessor element :tag))
(def attrs (accessor element :attrs))
(def content (accessor element :content))
(def content-handler
(new clojure.lang.XMLHandler
(implement [ContentHandler]
(startElement [uri local-name q-name #^Attributes atts]
(let [attrs (fn [ret i]
(if (neg? i)
ret
(recur (assoc ret
(. clojure.lang.Keyword (intern (symbol (. atts (getQName i)))))
(. atts (getValue i)))
(dec i))))
e (struct element
(. clojure.lang.Keyword (intern (symbol q-name)))
(when (pos? (. atts (getLength)))
(attrs {} (dec (. atts (getLength))))))]
(set! *stack* (conj *stack* *current*))
(set! *current* e)
(set! *state* :element))
nil)
(endElement [uri local-name q-name]
(let [push-content (fn [e c]
(assoc e :content (conj (or (:content e) []) c)))]
(when (= *state* :chars)
(set! *current* (push-content *current* (str *sb*))))
(set! *current* (push-content (peek *stack*) *current*))
(set! *stack* (pop *stack*))
(set! *state* :between))
nil)
(characters [ch start length]
(when-not (= *state* :between)
(when (= *state* :element)
(set! *sb* (new StringBuilder)))
(let [#^StringBuilder sb *sb*]
(. sb (append ch start length))
(set! *state* :chars)))
nil))))
(defn parse [s]
(let [p (.. SAXParserFactory (newInstance) (newSAXParser))]
(binding [*stack* nil
*current* (struct element)
*state* :between
*sb* nil]
(. p (parse s content-handler))
((:content *current*) 0))))
(defn emit-element [e]
(if (instance? String e)
(println e)
(do
(print (str "<" (name (:tag e))))
(when (:attrs e)
(doseq attr (:attrs e)
(print (str " " (name (key attr)) "='" (val attr)"'"))))
(if (:content e)
(do
(println ">")
(doseq c (:content e)
(emit-element c))
(println (str "</" (name (:tag e)) ">")))
(println "/>")))))
(defn emit [x]
(println "<?xml version='1.0' encoding='UTF-8'?>")
(emit-element x))
;(export '(tag attrs content parse element emit emit-element))
;(load-file "/Users/rich/dev/clojure/src/xml.clj")
;(def x (xml/parse "http://arstechnica.com/journals.rssx"))
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