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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.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_atom_hpp
#define tuscany_atom_hpp
/**
* ATOM data conversion functions.
*/
#include "string.hpp"
#include "list.hpp"
#include "value.hpp"
#include "monad.hpp"
#include "../xml/xml.hpp"
namespace tuscany {
namespace atom {
/**
* Tags used to tag feed and entry elements.
*/
const value feed("feed");
const value entry("entry");
/**
* Convert a list of elements to a list of element values representing an ATOM entry.
*/
const list<value> entryElementValues(const list<value>& e) {
const list<value> lt = elementChildren("title", e);
const list<value> t = nilListValue + element + value("title") + (isNull(lt)? value(emptyString) : elementValue(car(lt)));
const list<value> li = elementChildren("id", e);
const list<value> i = nilListValue + element + value("id") + (isNull(li)? value(emptyString) : elementValue(car(li)));
const list<value> la = elementChildren("author", e);
const list<value> lan = isNull(la)? nilListValue : elementChildren("name", car(la));
const list<value> lae = isNull(la)? nilListValue : elementChildren("email", car(la));
const list<value> laa = isNull(lan)? lae : lan;
const list<value> a = isNull(laa)? nilListValue : mklist<value>(nilListValue + element + value("author") + elementValue(car(laa)));
const list<value> lu = elementChildren("updated", e);
const list<value> u = isNull(lu)? nilListValue : mklist<value>(nilListValue + element + value("updated") + elementValue(car(lu)));
const list<value> lc = elementChildren("content", e);
const list<value> c = isNull(lc)? nilListValue : isAttribute(elementValue(car(lc)))? nilListValue :
mklist<value>(nilListValue + element + value("content") + elementValue(car(lc)));
return append<value>(append<value>(append<value>(nilListValue + element + entry + value(t) + value(i), a), u), c);
}
/**
* Convert a list of elements to a list of element values representing ATOM entries.
*/
const list<value> entriesElementValues(const list<value>& e) {
if (isNull(e))
return e;
return cons<value>(entryElementValues(car(e)), entriesElementValues(cdr(e)));
}
/**
* Return true if a list of strings contains an ATOM feed.
*/
const bool isATOMFeed(const list<string>& ls) {
if (!xml::isXML(ls))
return false;
return contains(car(ls), "<feed") && contains(car(ls), "=\"http://www.w3.org/2005/Atom\"");
}
/**
* Return true if a list of strings contains an ATOM entry.
*/
const bool isATOMEntry(const list<string>& ls) {
if (!xml::isXML(ls))
return false;
return contains(car(ls), "<entry") && !contains(car(ls), "<feed") && contains(car(ls), "=\"http://www.w3.org/2005/Atom\"");
}
/**
* Convert a list of strings to a list of values representing an ATOM entry.
*/
const failable<list<value> > readATOMEntry(const list<string>& ilist) {
const list<value> e = content(xml::readElements(ilist));
if (isNull(e))
return mkfailure<list<value> >("Empty entry");
return mklist<value>(entryElementValues(car(e)));
}
/**
* Convert a list of strings to a list of values representing an ATOM feed.
*/
const failable<list<value> > readATOMFeed(const list<string>& ilist) {
const list<value> f = content(xml::readElements(ilist));
if (isNull(f))
return mkfailure<list<value> >("Empty feed");
const list<value> t = elementChildren("title", car(f));
const list<value> i = elementChildren("id", car(f));
const list<value> e = elementChildren(entry, car(f));
return mklist<value>(append<value>(nilListValue + element + feed
+ value(nilListValue + element + value("title") + elementValue(car(t)))
+ value(nilListValue + element + value("id") + elementValue(car(i))),
entriesElementValues(e)));
}
/**
* Returns children of an ATOM content element.
*/
const list<value> contentElementChildren(const value& content) {
return filter<value>([](const value& v) {
return !(isAttribute(v) && attributeName((list<value>)v) == "type");
}, elementChildren(content));
}
/**
* Convert a list of element values representing an ATOM entry to a list of elements.
*/
const list<value> entryElement(const list<value>& l) {
const value title = elementChild("title", l);
const value id = elementChild("id", l);
const value author = elementChild("author", l);
const bool email = isNull(author)? false : contains(elementValue(author), "@");
const value updated = elementChild("updated", l);
const value content = elementChild("content", l);
const bool text = isNull(content)? false : elementHasValue(content);
return nilListValue
+ element + entry + (nilListValue + attribute + "xmlns" + "http://www.w3.org/2005/Atom")
+ (nilListValue + element + "title" + (nilListValue + attribute + "type" + "text") + elementValue(title))
+ (nilListValue + element + "id" + elementValue(id))
+ (isNull(author)? nilListValue : (nilListValue + element + "author" +
(email? (nilListValue + element + "email" + elementValue(author)) : (nilListValue + element + "name" + elementValue(author)))))
+ (isNull(updated)? nilListValue : (nilListValue + element + "updated" + elementValue(updated)))
+ (isNull(content)?
nilListValue :
append<value>(nilListValue + element + "content" + (nilListValue + attribute + "type" + (text? "text" : "application/xml")),
text? mklist<value>(elementValue(content)) : contentElementChildren(content)))
+ (nilListValue + element + "link" + (nilListValue + attribute + "href" + elementValue(id)));
}
/**
* Convert a list of element values representing ATOM entries to a list of elements.
*/
const list<value> entriesElements(const list<value>& l) {
if (isNull(l))
return l;
return cons<value>(entryElement(car(l)), entriesElements(cdr(l)));
}
/**
* Convert a list of element values representing an ATOM entry to an ATOM entry.
*/
template<typename R> const failable<R> writeATOMEntry(const lambda<const R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) {
const list<value> l = isNull(ll)? ll : (list<value>)car(ll);
return xml::writeElements<R>(reduce, initial, mklist<value>(entryElement(l)));
}
const failable<list<string> > writeATOMEntry(const list<value>& l) {
const failable<list<string> > ls = writeATOMEntry<list<string> >(rcons<string>, list<string>(), l);
if (!hasContent(ls))
return ls;
return reverse(list<string>(content(ls)));
}
/**
* Convert a list of element values representing an ATOM feed to an ATOM feed.
*/
template<typename R> const failable<R> writeATOMFeed(const lambda<const R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) {
const list<value> l = isNull(ll)? ll : (list<value>)car(ll);
const list<value> lt = elementChildren("title", l);
const value t = isNull(lt)? value(emptyString) : elementValue(car(lt));
const list<value> li = elementChildren("id", l);
const value i = isNull(li)? value(emptyString) : elementValue(car(li));
const list<value> f = nilListValue
+ element + feed + (nilListValue + attribute + "xmlns" + "http://www.w3.org/2005/Atom")
+ (nilListValue + element + "title" + (nilListValue + attribute + "type" + "text") + t)
+ (nilListValue + element + "id" + i);
// Write ATOM entries
const list<value> le = elementChildren(entry, l);
if (isNull(le))
return xml::writeElements<R>(reduce, initial, mklist<value>(f));
// Write a single ATOM entry element with a list of values
if (!isNull(le) && !isNull(car(le)) && isList(car<value>(caddr<value>(car(le))))) {
const list<value> fe = append(f, entriesElements(caddr<value>(car(le))));
return xml::writeElements<R>(reduce, initial, mklist<value>(fe));
}
// Write separate ATOM entry elements
const list<value> fe = append(f, entriesElements(le));
return xml::writeElements<R>(reduce, initial, mklist<value>(fe));
}
/**
* Convert a list of element values representing an ATOM feed to a list of strings.
*/
const failable<list<string> > writeATOMFeed(const list<value>& l) {
const failable<list<string> > ls = writeATOMFeed<list<string>>(rcons<string>, list<string>(), l);
if (!hasContent(ls))
return ls;
return reverse(list<string>(content(ls)));
}
}
}
#endif /* tuscany_atom_hpp */
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