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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))));
};
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