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# Nim Atom Syndication Format module
# Written 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
AtomCommon = ref object of RootObj # These properties aren't'gathered
xmlbase*: string
xmllang*: string
Atom* = ref object of AtomCommon
author*: AtomAuthor # Sugar, not in Atom spec. Refers to the first author.
id*: string # Required Atom field
title*: AtomText # Required Atom field
updated*: string # Required Atom field
authors*: seq[AtomAuthor] # Pleuralised because the Atom spec allows more than one
categories*: seq[AtomCategory]
contributors*: seq[AtomAuthor]
generator*: AtomGenerator
icon*: string
link*: AtomLink
logo*: string
rights*: string
subtitle*: AtomText
entries*: seq[AtomEntry]
AtomText* = ref object of AtomCommon
textType*: string
text*: string
AtomGenerator* = ref object of AtomText
uri*: string
AtomAuthor* = ref object of AtomCommon
name*: string # Required Atom field
uri*: string
email*: string
AtomCategory* = ref object of AtomCommon
term*: string
label*: string
scheme*: string
AtomContent* = ref object of AtomText
src*: string
AtomLink* = ref object of AtomCommon
href*: string
rel*: string
linktype*: string
hreflang*: string
title*: string
length*: string
AtomEntry* = ref object of AtomCommon
id*: string # Required Atom field
title*: AtomText # Required Atom field
updated*: string # Required Atom field
author*: AtomAuthor # Sugar, not in Atom spec. Returns the first author.
authors*: seq[AtomAuthor] # Pleuralised because the Atom spec allows more than one
categories*: seq[AtomCategory]
content*: AtomContent
contributors*: seq[AtomAuthor]
link*: AtomLink
published*: string
rights*: string
source*: AtomSource
summary*: string
AtomSource* = ref object of AtomCommon
author*: AtomAuthor # Sugar, not in Atom spec. Returns the first author.
authors*: seq[AtomAuthor]
categories*: seq[AtomCategory]
contributors*: seq[AtomAuthor]
generator*: AtomGenerator
icon*: string
id*: string
link*: AtomLink
logo*: string
rights*: string
subtitle*: string
title*: string
updated*: string
# Promotes text node to the top of an AtomText object if caller expects a string
converter toString*(obj: AtomText): string =
return obj.text
func parseAuthors ( node: XmlNode, mode="author" ) : seq[AtomAuthor] =
var authors:seq[AtomAuthor]
if node.child(mode) != nil:
for athr_node in node.findAll(mode):
var author: AtomAuthor = AtomAuthor()
author.name = athr_node.child("name").innerText
if athr_node.child("uri") != nil: author.uri = athr_node.child("uri").innerText
if athr_node.child("email") != nil: author.email = athr_node.child("email").innerText
authors.add(author)
if authors.len == 0: return @[]
return authors
func parseCategories ( node: XmlNode ) : seq[AtomCategory] =
var categories:seq[AtomCategory]
if node.child("category") != nil:
for cat_node in node.findAll("category"):
var category: AtomCategory = AtomCategory()
if cat_node.attr("term") != "": category.term = cat_node.attr("term")
if cat_node.attr("label") != "": category.label = cat_node.attr("label")
if cat_node.attr("scheme") != "": category.scheme = cat_node.attr("scheme")
categories.add(category)
if categories.len == 0: return @[]
return categories
func parseGenerator ( node: XmlNode ): AtomGenerator =
var generator = AtomGenerator()
let generator_node = node.child("generator")
generator.text = generator_node.innerText
if node.attrs != nil: generator.uri = generator_node.attr("uri")
return generator
func parseLink ( node: XmlNode ): AtomLink =
var link: AtomLink = AtomLink()
if node.attrs != nil:
if node.attr("href") != "": link.href = node.attr("href")
if node.attr("rel") != "": link.rel = node.attr("rel")
if node.attr("type") != "": link.linktype = node.attr("type")
if node.attr("hreflang") != "": link.hreflang = node.attr("hreflang")
if node.attr("title") != "": link.title = node.attr("title")
if node.attr("length") != "": link.length = node.attr("length")
return link
func parseText ( node: XmlNode ): string =
if node.attr("type") == "xhtml" or node.attr("type") == "html":
var content = ""
for item in node.items:
content = content & $item
# Strip CDATA
if content[0 .. 8] == "<![CDATA[":
content = content.substr[9 .. content.len()-4 ]
return content
else:
return node.innerText
func parseEntry( node: XmlNode ) : AtomEntry =
var entry: AtomEntry = AtomEntry()
# Fill the required fields
entry.id = node.child("id").innerText
entry.title = AtomText()
if node.attrs != nil: entry.title.textType = node.attr("type")
entry.title.text = node.child("title").parseText()
entry.updated = node.child("updated").innerText
# Fill the optinal fields
entry.authors = node.parseAuthors()
if node.child("category") != nil: entry.categories = node.parseCategories()
if node.child("content") != nil:
let content_node = node.child("content")
entry.content = AtomContent()
entry.content.text = content_node.innerText
if content_node.attrs != nil:
entry.content.src = content_node.attr("src")
entry.content.texttype = content_node.attr("type")
entry.content.text = content_node.parseText()
if node.child("contributor") != nil:
entry.contributors = node.parseAuthors(mode="contributor")
if node.child("link") != nil: entry.link = node.child("link").parseLink()
if node.child("published") != nil: entry.published = node.child("published").innerText
if node.child("rights") != nil: entry.rights = node.child("rights").innerText
if node.child("source") != nil:
let source = node.child("source")
entry.source = AtomSource()
if source.child("author") != nil: entry.source.authors = source.parseAuthors()
if source.child("category") != nil: entry.source.categories = source.parseCategories()
if source.child("contributor") != nil: entry.source.contributors = source.parseAuthors(mode="contributor")
if source.child("generator") != nil: entry.source.generator = source.parseGenerator()
if source.child("icon") != nil: entry.source.icon = source.child("icon").innerText
if source.child("id") != nil: entry.source.id = source.child("id").innerText
if source.child("link") != nil: entry.source.link = source.child("link").parseLink()
if source.child("logo") != nil: entry.source.logo = source.child("logo").innerText
if source.child("rights") != nil: entry.source.rights = source.child("rights").innerText
if source.child("subtitle") != nil: entry.source.subtitle = source.child("subtitle").parseText()
if source.child("title") != nil: entry.source.title = source.child("title").parseText()
if source.child("updated") != nil: entry.source.updated = source.child("updated").innerText
entry.source.author = entry.source.authors[0]
if node.child("summary") != nil: entry.summary = node.child("summary").innerText
# SUGAR an easy way to access an author
if entry.authors.len() > 0:
entry.author = entry.authors[0]
else:
entry.author = AtomAuthor()
return entry
proc parseAtom* ( data: string ): Atom =
## Parses the Atom from the given string.
# Parse into XML.
let node: XmlNode = parseXML(newStringStream(data))
# Create the return object.
var atom: Atom = Atom()
# Fill in the required fields
atom.id = node.child("id").innerText
atom.title = AtomText()
atom.title.text = node.child("title").parseText()
atom.updated = node.child("updated").innerText
# Fill in the optional fields
if node.child("author") != nil: atom.authors = node.parseAuthors()
if node.child("category") != nil: atom.categories = node.parseCategories()
if node.child("contributor") != nil: atom.contributors = node.parseAuthors(mode="contributor")
if node.child("generator") != nil: atom.generator = node.parseGenerator()
if node.child("icon") != nil: atom.icon = node.child("icon").innerText
if node.child("link") != nil: atom.link = node.child("link").parseLink()
if node.child("logo") != nil: atom.logo = node.child("logo").innerText
if node.child("rights") != nil: atom.rights = node.child("rights").innerText
if node.child("subtitle") != nil:
atom.subtitle = AtomText()
atom.subtitle.text = node.child("subtitle").innerText
if atom.authors.len() > 0:
atom.author = atom.authors[0]
else:
atom.author = AtomAuthor()
if node.child("entry") == nil: # If there are no entries:
atom.entries = @[]
return atom
if node.child("entry") != nil: # Otherwise, add the entries.
atom.entries = map( node.findAll("entry"), parseEntry )
# Return the Atom data.
return atom
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