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# Nim RSS (Really Simple Syndication) module
# Orginally written by Adam Chesak.
# Rewritten by John Conway
# Released under the MIT open source license.
import httpclient
import strutils
import sequtils
import xmlparser
import xmltree
import streams
import sugar
type
RSS* = object
title*: string
link*: string
description*: string
language*: string
copyright*: string
managingEditor*: string
webMaster*: string
pubDate*: string
lastBuildDate*: string
categories*: seq[RSSCategory]
generator*: string
docs*: string
cloud*: RSSCloud
ttl*: int
image*: RSSImage
rating*: string
textInput*: RSSTextInput
skipHours*: seq[int]
skipDays*: seq[string]
items*: seq[RSSItem]
RSSText = ref object of RootObj
text*: string
RSSCategory = ref object of RSSText
domain*: string
RSSEnclosure* = object
url*: string
length*: string
enclosureType*: string
RSSCloud* = object
domain*: string
port*: string
path*: string
registerProcedure*: string
protocol*: string
RSSImage* = object
url*: string
title*: string
link*: string
width*: string
height*: string
description*: string
RSSTextInput* = object
title*: string
description*: string
name*: string
link*: string
RSSSource* = ref object of RSSText
url*: string
RSSItem* = object
title*: string
link*: string
description*: string
author*: string
categories*: seq[RSSCategory]
comments*: string
enclosure*: RSSEnclosure
guid*: string
pubDate*: string
source*: RSSSource
converter rssToString*(obj: RSSText): string =
return obj.text
func parseCategories( node: XmlNode ): seq[RSSCategory] =
var categories:seq[RSSCategory]
for cat_node in node.findAll("category"):
var category: RSSCategory = RSSCategory()
if cat_node.attr("domain") != "": category.domain = cat_node.attr("domain")
category.text = cat_node.innerText
categories.add(category)
if categories.len == 0: return @[]
return categories
func parseText ( node: XmlNode ): string =
var content = node.innerText
if content.len() > 14:
if content[0 .. 8] == "<![CDATA[":
return content.substr[9 .. content.len()-4 ]
return content
func parseItem( node: XmlNode) : RSSItem =
var item: RSSItem = RSSItem()
if node.child("title") != nil: item.title = node.child("title").parseText()
if node.child("link") != nil: item.link = node.child("link").innerText
if node.child("description") != nil: item.description = node.child("description").parseText()
for key in @["author", "dc:creator"]:
if node.child(key) != nil: item.author = node.child(key).innerText
if node.child("category") != nil: item.categories = node.parseCategories()
if node.child("comments") != nil: item.comments = node.child("comments").innerText
if node.child("enclosure") != nil:
var encl: RSSEnclosure = RSSEnclosure()
encl.url = node.child("enclosure").attr("url")
encl.length = node.child("enclosure").attr("length")
encl.enclosureType = node.child("enclosure").attr("type")
item.enclosure = encl
if node.child("guid") != nil: item.guid = node.child("guid").innerText
if node.child("pubDate") != nil: item.pubDate = node.child("pubDate").innerText
if node.child("source") != nil:
item.source = RSSSource()
item.source.url = node.child("source").attr("url")
item.source.text = node.child("source").innerText
return item
proc parseRSS*(data: string): RSS =
## Parses the RSS from the given string.
# Parse into XML.
let root: XmlNode = parseXML(newStringStream(data))
let channel: XmlNode = root.child("channel")
# Create the return object.
var rss: RSS = RSS()
# Fill the required fields.
rss.title = channel.child("title").parseText()
rss.link = channel.child("link").innerText
rss.description = channel.child("description").parseText()
# Fill the optional fields.
for key in @["language", "dc:language"]:
if channel.child(key) != nil:
rss.language = channel.child(key).innerText
if channel.child("copyright") != nil: rss.copyright = channel.child("copyright").innerText
if channel.child("managingEditor") != nil: rss.managingEditor = channel.child("managingEditor").innerText
if channel.child("webMaster") != nil: rss.webMaster = channel.child("webMaster").innerText
for key in @["pubDate", "dc:date"]:
if channel.child(key) != nil:
rss.pubDate = channel.child(key).innerText
if channel.child("lastBuildDate") != nil: rss.lastBuildDate = channel.child("lastBuildDate").innerText
if channel.child("category") != nil: rss.categories = channel.parseCategories()
for key in @["generator", "dc:publisher"]:
if channel.child(key) != nil: rss.generator = channel.child(key).innerText
if channel.child("docs") != nil: rss.docs = channel.child("docs").innerText
if channel.child("cloud") != nil:
var cloud: RSSCloud = RSSCloud()
cloud.domain = channel.child("cloud").attr("domain")
cloud.port = channel.child("cloud").attr("port")
cloud.path = channel.child("cloud").attr("path")
cloud.registerProcedure = channel.child("cloud").attr("registerProcedure")
cloud.protocol = channel.child("cloud").attr("protocol")
rss.cloud = cloud
if channel.child("ttl") != nil: rss.ttl = channel.child("ttl").innerText.parseInt()
if channel.child("image") != nil:
var image: RSSImage = RSSImage()
let img = channel.child("image")
if img.child("url") != nil: image.url = img.child("url").innerText
if img.attr("rdf:resource") != "" and img.attr("rdf:resource") != "": image.url = img.attr("rdf:resource")
if img.child("title") != nil: image.title = img.child("title").innerText
if img.child("link") != nil: image.link = img.child("link").innerText
if img.child("width") != nil: image.width = img.child("width").innerText
if img.child("height") != nil: image.height = img.child("height").innerText
if img.child("description") != nil: image.description = img.child("description").parseText()
rss.image = image
if channel.child("rating") != nil: rss.rating = channel.child("rating").innerText
if channel.child("textInput") != nil:
var textInput: RSSTextInput = RSSTextInput()
textInput.title = channel.child("textInput").child("title").innerText
textInput.description = channel.child("textInput").child("description").innerText
textInput.name = channel.child("textInput").child("name").innerText
textInput.link = channel.child("textInput").child("link").innerText
rss.textInput = textInput
if channel.child("skipHours") != nil:
rss.skipHours = map(channel.findAll("hour"), (x: XmlNode) -> int => x.innerText.parseInt() )
if channel.child("skipDays") != nil:
rss.skipDays = map(channel.findAll("day"), (x: XmlNode) -> string => x.innerText)
# If there are no items:
if channel.child("item") == nil and root.child("item") == nil:
rss.items = @[]
return rss
# Otherwise, add the items.
if channel.child("item") != nil: rss.items = map(channel.findAll("item"), parseItem)
else: rss.items = map(root.findAll("item"), parseItem)
# Return the RSS data.
return rss
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