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+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied. See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+/**
+ * ATOM data conversion functions.
+ */
+var atom = new Object();
+
+/**
+ * Convert a list of elements to a list of values representing an ATOM entry.
+ */
+atom.entryElementsToValues = function(e) {
+ var lt = filter(selector(mklist(element, "'title")), e);
+ var t = isNil(lt)? '' : elementValue(car(lt));
+ var li = filter(selector(mklist(element, "'id")), e);
+ var i = isNil(li)? '' : elementValue(car(li));
+ var lc = filter(selector(mklist(element, "'content")), e);
+ return mklist(t, i, elementValue(car(lc)));
+};
+
+/**
+ * Convert a list of elements to a list of values representing ATOM entries.
+ */
+atom.entriesElementsToValues = function(e) {
+ if (isNil(e))
+ return e;
+ return cons(atom.entryElementsToValues(car(e)), atom.entriesElementsToValues(cdr(e)));
+};
+
+/**
+ * Convert a list of strings to a list of values representing an ATOM entry.
+ */
+atom.readATOMEntry = function(l) {
+ var e = readXML(l);
+ if (isNil(e))
+ return mklist();
+ return atom.entryElementsToValues(car(e));
+};
+
+/**
+ * Convert a list of values representy an ATOM entry to a value.
+ */
+atom.entryValue = function(e) {
+ var v = elementsToValues(mklist(caddr(e)));
+ return cons(car(e), (cadr(e), cdr(car(v))));
+};
+
+/**
+ * Return true if a list of strings represents an ATOM feed.
+ */
+atom.isATOMFeed = function(l) {
+ if (!isXML(l))
+ return false;
+ return car(l).match('<feed') != null && car(l).match('="http://www.w3.org/2005/Atom"') != null;
+};
+
+/**
+ * Convert a DOM document to a list of values representing an ATOM feed.
+ */
+atom.readATOMFeedDocument = function(doc) {
+ var f = readXMLDocument(doc);
+ if (isNil(f))
+ return mklist();
+ var t = filter(selector(mklist(element, "'title")), car(f));
+ var i = filter(selector(mklist(element, "'id")), car(f));
+ var e = filter(selector(mklist(element, "'entry")), car(f));
+ if (isNil(e))
+ return mklist(elementValue(car(t)), elementValue(car(i)));
+ return cons(elementValue(car(t)), cons(elementValue(car(i)), atom.entriesElementsToValues(e)));
+};
+
+/**
+ * Convert a list of strings to a list of values representing an ATOM feed.
+ */
+atom.readATOMFeed = function(l) {
+ return atom.readAtomFeedDocument(parseXML(l));
+};
+
+/**
+ * Convert an ATOM feed containing elements to an ATOM feed containing values.
+ */
+atom.feedValues = function(e) {
+ function feedValuesLoop(e) {
+ if (isNil(e))
+ return e;
+ return cons(entryValue(car(e)), feedValuesLoop(cdr(e)));
+ }
+
+ return cons(car(e), cons(cadr(e), feedValuesLoop(cddr(e))));
+};
+
+/**
+ * Convert a list of values representy an ATOM entry to a list of elements.
+ */
+atom.entryElement = function(l) {
+ return mklist(element, "'entry", mklist(attribute, "'xmlns", "http://www.w3.org/2005/Atom"),
+ mklist(element, "'title", mklist(attribute, "'type", "text"), car(l)),
+ mklist(element, "'id", cadr(l)),
+ mklist(element, "'content", mklist(attribute, "'type", (isList(caddr(l))? "application/xml" : "text")), caddr(l)),
+ mklist(element, "'link", mklist(attribute, "'href", cadr(l))));
+};
+
+/**
+ * Convert a list of values representing ATOM entries to a list of elements.
+ */
+atom.entriesElements = function(l) {
+ if (isNil(l))
+ return l;
+ return cons(atom.entryElement(car(l)), atom.entriesElements(cdr(l)));
+};
+
+/**
+ * Convert a list of values representing an ATOM entry to an ATOM entry.
+ */
+atom.writeATOMEntry = function(l) {
+ return writeXML(mklist(atom.entryElement(l)), true);
+};
+
+/**
+ * Convert a list of values representing an ATOM feed to an ATOM feed.
+ */
+atom.writeATOMFeed = function(l) {
+ var f = mklist(element, "'feed", mklist(attribute, "'xmlns", "http://www.w3.org/2005/Atom"),
+ mklist(element, "'title", mklist(attribute, "'type", "text"), car(l)),
+ mklist(element, "'id", cadr(l)));
+ if (isNil(cddr(l)))
+ return writeXML(mklist(f), true);
+ var fe = append(f, atom.entriesElements(cddr(l)));
+ return writeXML(mklist(fe), true);
+};
+
+/**
+ * Convert an ATOM entry containing a value to an ATOM entry containing an item element.
+ */
+atom.entryValuesToElements = function(v) {
+ if (isList(caddr(v)))
+ return cons(car(v), cons(cadr(v), valuesToElements(mklist(cons("'item", caddr(v))))));
+ return cons(car(v), cons(cadr(v), valuesToElements(mklist(mklist("'item", caddr(v))))));
+};
+
+/**
+ * Convert an ATOM feed containing values to an ATOM feed containing elements.
+ */
+atom.feedValuesToElements = function(v) {
+ function feedValuesToElementsLoop(v) {
+ if (isNil(v))
+ return v;
+ return cons(atom.entryValuesToElements(car(v)), feedValuesToElementsLoop(cdr(v)));
+ }
+
+ return cons(car(v), cons(cadr(v), feedValuesToElementsLoop(cddr(v))));
+};
+