diff options
| -rw-r--r-- | src/xml.clj | 74 |
1 files changed, 74 insertions, 0 deletions
diff --git a/src/xml.clj b/src/xml.clj new file mode 100644 index 00000000..a0dfce02 --- /dev/null +++ b/src/xml.clj @@ -0,0 +1,74 @@ +; 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-namespace 'xml) + +(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 (sym (. atts (getQName i))))) + (. atts (getValue i))) + (dec i)))) + e (struct element + :tag (. clojure.lang.Keyword (intern (sym q-name))) + :attrs (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 (eql? *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 (eql? *state* :between) + (when (eql? *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)))) + +(def *export* '(xml tag attrs content parse)) + +;(load-file "/Users/rich/dev/clojure/src/xml.clj") +;(def x (xml/parse "http://arstechnica.com/journals.rssx")) |