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#!/usr/local/bin/macruby

# Copyright (c) 2009 Matt Aimonetti

#

# Permission is hereby granted, free of charge, to any person obtaining a copy

# of this software and associated documentation files (the "Software"), to deal

# in the Software without restriction, including without limitation the rights

# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

# copies of the Software, and to permit persons to whom the Software is

# furnished to do so, subject to the following conditions:

#

# The above copyright notice and this permission notice shall be included in

# all copies or substantial portions of the Software.

#

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

# THE SOFTWARE.

# example script that fetches the top 5 results from google and capture the pages in PDF format.

# inspired by http://github.com/tomafro/macruby-snapper

#

framework 'Cocoa'

# Documentation for NSXMLParser delegates:

# http://developer.apple.com/mac/library/documentation/cocoa/reference/NSXMLParserDelegate_Protocol/Reference/Reference.html

class RSSParser

attr_accessor :parser, :xml_url, :doc

def initialize(xml_url)

@xml_url = xml_url

NSApplication.sharedApplication

url = NSURL.alloc.initWithString(xml_url)

@parser = NSXMLParser.alloc.initWithContentsOfURL(url)

@parser.shouldProcessNamespaces = true

@parser.delegate = self

@items = []

end

# RSSItem is a simple class that holds all of RSS items.

# Extend this class to display/process the item differently.

class RSSItem

attr_accessor :title, :description, :link, :guid, :pubDate, :enclosure

def initialize

@title, @description, @link, @pubDate, @guid = '', '', '', '', ''

end

end

# Starts the parsing and send each parsed item through its block.

#

# Usage:

# feed.parse do |item|

# puts item.link

# end

def parse(&block)

@block = block

puts "Parsing #{xml_url}"

@parser.parse

end

# Starts the parsing but keep block the main runloop

# until the parsing is done.

# Do not use this method in a GUI app.

# use #parse instead.

def block_while_parsing(&block)

@parsed = false

parse(&block)

NSRunLoop.currentRunLoop.runUntilDate(NSDate.distantFuture) until @parsed

end

# Delegate getting called when parsing starts

def parserDidStartDocument(parser)

puts "starting parsing.."

end

# Delegate being called when an element starts being processed

def parser(parser, didStartElement:element, namespaceURI:uri, qualifiedName:name, attributes:attrs)

if element == 'item'

@current_item = RSSItem.new

elsif element == 'enclosure'

@current_item.enclosure = attrs

end

@current_element = element

end

# as the parser finds characters, this method is being called

def parser(parser, foundCharacters:string)

if @current_item && @current_item.respond_to?(@current_element)

el = @current_item.send(@current_element)

el << string if el.respond_to?(:<<)

end

end

# method called when an element is done being parsed

def parser(parser, didEndElement:element, namespaceURI:uri, qualifiedName:name)

if element == 'item'

@items << @current_item

end

end

# delegate getting called when the parsing is done

# If a block was set, it will be called on each parsed items

def parserDidEndDocument(parser)

@parsed = true

puts "done parsing"

if @block

@items.each{|item| @block.call(item)}

end

end

end

twitter = RSSParser.new("http://twitter.com/statuses/user_timeline/17093090.rss")

# because we are running in a script, we need the run loop to keep running

# until we are done with parsing

#

# If we would to use the above code in a GUI app,

# we would use #parse instead of #block_while_parsing

twitter.block_while_parsing do |item|

print item.title

end