diff options
Diffstat (limited to 'sca-cpp/trunk/modules/rss/rss.hpp')
| -rw-r--r-- | sca-cpp/trunk/modules/rss/rss.hpp | 127 |
1 files changed, 64 insertions, 63 deletions
diff --git a/sca-cpp/trunk/modules/rss/rss.hpp b/sca-cpp/trunk/modules/rss/rss.hpp index 646a8fd030..c62d137adc 100644 --- a/sca-cpp/trunk/modules/rss/rss.hpp +++ b/sca-cpp/trunk/modules/rss/rss.hpp @@ -36,24 +36,33 @@ namespace tuscany { namespace rss { /** - * Convert a list of elements to a list of values representing an RSS entry. + * Tags used to tag feed and entry elements. */ -const list<value> entryElementsToValues(const list<value>& e) { +const value feed("feed"); +const value entry("entry"); + +/** + * Convert a list of elements to a list of element values representing an RSS entry. + */ +const list<value> entryElementValues(const list<value>& e) { const list<value> lt = filter<value>(selector(mklist<value>(element, "title")), e); const value t = isNil(lt)? value(emptyString) : elementValue(car(lt)); const list<value> li = filter<value>(selector(mklist<value>(element, "link")), e); const value i = isNil(li)? value(emptyString) : elementValue(car(li)); const list<value> ld = filter<value>(selector(mklist<value>(element, "description")), e); - return mklist<value>(t, i, isNil(ld)? (value)list<value>() : elementValue(car(ld))); + return append<value>(list<value>() + element + entry + + value(list<value>() + element + value("title") + t) + + value(list<value>() + element + value("id") + i), + isNil(ld)? list<value>() : mklist<value>(value(list<value>() + element + value("content") + elementValue(car(ld))))); } /** - * Convert a list of elements to a list of values representing RSS entries. + * Convert a list of elements to a list of element values representing ATOM entries. */ -const list<value> entriesElementsToValues(const list<value>& e) { +const list<value> entriesElementValues(const list<value>& e) { if (isNil(e)) return e; - return cons<value>(entryElementsToValues(car(e)), entriesElementsToValues(cdr(e))); + return cons<value>(entryElementValues(car(e)), entriesElementValues(cdr(e))); } /** @@ -72,15 +81,7 @@ const failable<list<value> > readRSSEntry(const list<string>& ilist) { const list<value> e = readXML(ilist); if (isNil(e)) return mkfailure<list<value> >("Empty entry"); - return entryElementsToValues(car(e)); -} - -/** - * Convert a list of values representing an RSS entry to a value. - */ -const value entryValue(const list<value>& e) { - const list<value> v = elementsToValues(mklist<value>(caddr(e))); - return cons(car(e), mklist<value>(cadr(e), isList(car(v))? (isNil((list<value>)car(v))? car(v) : (value)cdr<value>(car(v))) : car(v))); + return mklist<value>(entryElementValues(car(e))); } /** @@ -94,34 +95,28 @@ const failable<list<value> > readRSSFeed(const list<string>& ilist) { const list<value> t = filter<value>(selector(mklist<value>(element, "title")), car(c)); const list<value> i = filter<value>(selector(mklist<value>(element, "link")), car(c)); const list<value> e = filter<value>(selector(mklist<value>(element, "item")), car(c)); - if (isNil(e)) - return mklist<value>(elementValue(car(t)), elementValue(car(i))); - return cons<value>(elementValue(car(t)), cons(elementValue(car(i)), entriesElementsToValues(e))); -} - -/** - * Convert an RSS feed containing elements to an RSS feed containing values. - */ -const list<value> feedValuesLoop(const list<value> e) { - if (isNil(e)) - return e; - return cons<value>(entryValue(car(e)), feedValuesLoop(cdr(e))); -} - -const list<value> feedValues(const list<value>& e) { - return cons(car<value>(e), cons<value>(cadr<value>(e), feedValuesLoop(cddr<value>(e)))); + return mklist<value>(append<value>(list<value>() + element + feed + + value(list<value>() + element + value("title") + elementValue(car(t))) + + value(list<value>() + element + value("id") + elementValue(car(i))), + entriesElementValues(e))); } /** - * Convert a list of values representing an RSS entry to a list of elements. - * The first two values in the list are the entry title and id. + * Convert a list of element values representing an RSS entry to a list of elements. */ const list<value> entryElement(const list<value>& l) { - return list<value>() + const value title = elementValue(elementChild("title", l)); + const value id = elementValue(elementChild("id", l)); + const value content = elementChild("content", l); + const bool text = isNil(content)? false : elementHasValue(content); + return append<value>(list<value>() + element + "item" - + (list<value>() + element + "title" + car(l)) - + (list<value>() + element + "link" + cadr(l)) - + (isNil(cddr(l))? list<value>() : list<value>() + element + "description" + caddr(l)); + + (list<value>() + element + "title" + title) + + (list<value>() + element + "link" + id), + isNil(content)? + list<value>() : + mklist<value>(append<value>(list<value>() + element + "description", + text? mklist<value>(elementValue(content)) : elementChildren(content)))); } /** @@ -137,7 +132,8 @@ const list<value> entriesElements(const list<value>& l) { * Convert a list of values representing an RSS entry to an RSS entry. * The first two values in the list are the entry id and title. */ -template<typename R> const failable<R> writeRSSEntry(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& l) { +template<typename R> const failable<R> writeRSSEntry(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) { + const list<value> l = isNil(ll)? ll : (list<value>)car(ll); return writeXML<R>(reduce, initial, mklist<value>(entryElement(l))); } @@ -152,12 +148,37 @@ const failable<list<string> > writeRSSEntry(const list<value>& l) { * Convert a list of values representing an RSS feed to an RSS feed. * The first two values in the list are the feed id and title. */ -template<typename R> const failable<R> writeRSSFeed(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& l) { +template<typename R> const failable<R> writeRSSFeed(const lambda<R(const string&, const R)>& reduce, const R& initial, const list<value>& ll) { + const list<value> l = isNil(ll)? ll : (list<value>)car(ll); + const list<value> lt = filter<value>(selector(mklist<value>(element, "title")), l); + const value t = isNil(lt)? value(emptyString) : elementValue(car(lt)); + const list<value> li = filter<value>(selector(mklist<value>(element, "id")), l); + const value i = isNil(li)? value(emptyString) : elementValue(car(li)); const list<value> c = list<value>() - + (list<value>() + element + "title" + car(l)) - + (list<value>() + element + "link" + cadr(l)) - + (list<value>() + element + "description" + car(l)); - const list<value> ce = isNil(cddr(l))? c : append(c, entriesElements(cddr(l))); + + (list<value>() + element + "title" + t) + + (list<value>() + element + "link" + i) + + (list<value>() + element + "description" + t); + + // Write RSS entries + const list<value> le = filter<value>(selector(mklist<value>(element, entry)), l); + if (isNil(le)) { + const list<value> fe = list<value>() + + element + "rss" + (list<value>() + attribute + "version" + "2.0") + + append(list<value>() + element + "channel", c); + return writeXML<R>(reduce, initial, mklist<value>(fe)); + } + + // Write a single RSS entry element with a list of values + if (!isNil(le) && !isNil(car(le)) && isList(car<value>(caddr<value>(car(le))))) { + const list<value> ce = append(c, entriesElements(caddr<value>(car(le)))); + const list<value> fe = list<value>() + + element + "rss" + (list<value>() + attribute + "version" + "2.0") + + append(list<value>() + element + "channel", ce); + return writeXML<R>(reduce, initial, mklist<value>(fe)); + } + + // Write separate RSS entry elements + const list<value> ce = append(c, entriesElements(le)); const list<value> fe = list<value>() + element + "rss" + (list<value>() + attribute + "version" + "2.0") + append(list<value>() + element + "channel", ce); @@ -175,26 +196,6 @@ const failable<list<string> > writeRSSFeed(const list<value>& l) { return reverse(list<string>(content(ls))); } -/** - * Convert an RSS entry containing a value to an RSS entry containing an item element. - */ -const list<value> entryValuesToElements(const list<value> val) { - return cons(car(val), cons(cadr(val), valuesToElements(mklist<value>(cons<value>("item", (list<value>)caddr(val)))))); -} - -/** - * Convert an RSS feed containing values to an RSS feed containing elements. - */ -const list<value> feedValuesToElementsLoop(const list<value> val) { - if (isNil(val)) - return val; - return cons<value>(entryValuesToElements(car(val)), feedValuesToElementsLoop(cdr(val))); -} - -const list<value> feedValuesToElements(const list<value>& val) { - return cons(car<value>(val), cons<value>(cadr<value>(val), feedValuesToElementsLoop(cddr<value>(val)))); -} - } } |