data == code | LRUG April 2008

code == data

data == code

OpenStruct

Photo: Salt Fired http://www.flickr.com/photos/saltfired/201994906/

require 'ostruct'

o = OpenStruct.new

o.name = 'el rug'

o.name

=> "el rug"

o.inspect

=> <OpenStruct name=\"el rug\">

# not very classy

o.class

=> OpenStruct

class Fund < OpenStruct

def your_logicend

end

public class Fundextends HashMap {

}

public class Fundextends HashMap {

/* bad code smell */

}

public class Fundextends HashMap<String,

Object> {

}

public class Fundextends HashMap<String,

Object> {

/* this stinks! */

}

Morph

Photo: Salt Firedhttp://www.flickr.com/photos/saltfired/201998836/

gem install morph

require 'morph'

require 'hpricot'

require 'open-uri'

class Hubbit

include Morph

def initialize name

doc = Hpricot open"http://github.com/#{name}"

(doc/'label').collect do |l|

label = l.inner_text

value = l.next_sibling.inner_text.strip

morph(label, value)

class Hubbit

include Morph

def initialize name begin doc = Hpricot open("http://github.com/#{name}")

(doc/'label').collect do |node| label = node.inner_text value = node.next_sibling.inner_text.strip

morph(label, value)

end rescue raise "Couldn't find hubbit with name: #{name}" end endend

Hubbit.morph_methods

=> []

why = Hubbit.new 'why'

=> #<Hubbit @name="why the lucky

stiff", @email="why@why...">


=>["email", "email=","name", "name="]

why.name

=> "why the lucky stiff"

why. 年龄 = 21

why. 年龄

=> 21

why.company

NoMethodError: undefined method

'company'

# maybe should have

why.company?

# but that's not there yet

dhh = Hubbit.new 'dhh'


=> ["blog", "blog=", "company", "company=",

"email", "email=", "location", "location=",

"name", "name=","年龄 ", "年龄 ="]

dhh.company

=> "37signals"

why.company

=> nil

implementation

def method_missing sym, *argsis_writer = sym.to_s =~ /=$/

is_writer? morph_method_missing(sym, *args): super

end

def morph_method_missing symbol, *args attribute = symbol.to_s.chomp '=' # ... if block_given? yield self.class, attribute else self.class.class_eval

"attr_accessor :#{attribute}" send(symbol, *args) end # ...end

Soup

Photo: Chrissy Wainwrighthttp://www.flickr.com/photos/wainwright/380578681/

gem install soup

require 'soup'

Soup.prepare

s = Snip.new

s.name = 'el rug'

s.inspect

=> "<Snip id:unset name:el rug>"

s.save

=> "<Snip id:1 name:el rug>"

s = Snip['el rug']

=> "<Snip id:1 name:el rug>"

# has no class

s.class

=> nil

BlankSlate

class EmptyClass

instance_methods.each { |m| undef_method(m) unless m =~ /^(__|instance_eval|respond_to\?)/ }

end

class Snip < EmptyClass; end

Pottery

Photo: zhaoshourenhttp://www.flickr.com/photos/ajanhelendam/2326369128/

http://www.flickr.com/photos/

gem install pottery

def get_price_rows doc rows = rows_starting 'Bid(GBX)', doc

@bid_offer = rows.size > 0

rows = rows_starting 'Nav(GBX)', doc unless @bid_offer

rows end

def rows_starting label, doc

(doc/"table/tr/td/[text()='#{label}']/../../../tr")

end

def each_entry doc

get_price_rows(doc).each do |row|

cells = (row/'td').collect(&:inner_text). collect(&:strip).delete_if(&:blank?)

cells.in_groups_of(2) do |entry| yield entry[0], entry[1] end

end

end

doc = open_doc url

each_entry doc do |label, value| morph(label, value) end

time = Time.now.utc.to_s self.time = time.match(/\d\d:\d\d:\d\d/)[0] self.name = doc.at('.FundNameHeader').inner_text self.url = url self.date = Date.today.to_s self.id_name = "#{url}##{date}"

require 'pottery'

class Fund

include Pottery

def initialize fund=nil if fund url = "http://funds.ft.com/funds/#{fund}" doc = open_doc url

each_entry doc do |label, value| morph(label, value) end

time = Time.now.utc.to_s self.time = time.match(/\d\d:\d\d:\d\d/)[0] self.name = doc.at('.FundNameHeader').inner_text self.url = url self.date = Date.today.to_s self.id_name = "#{url}##{date}" end end

def bid_price @bid_offer ? bid_gbx : nav_gbx end

def offer_price @bid_offer ? offer_gbx : '' end

private

def each_entry doc get_price_rows(doc).each do |row| cells = (row/'td').collect(&:inner_text).collect(&:strip).delete_if(&:blank?) cells.in_groups_of(2) do |entry| yield entry[0], entry[1] end end end

def get_price_rows doc rows = rows_starting 'Bid(GBX)', doc @bid_offer = rows.size > 0 rows = rows_starting 'Nav(GBX)', doc unless @bid_offer rows end

def rows_starting label, doc (doc/"table/tr/td/[text()='#{label}']/../../../tr") end

end # of Fund

fund = Fund.new 'rufferllp/ruffer/RZBST'

Fund.morph_methods

["_52w_high", "_52w_high=", "_52w_low", "_52w_low=",

"change", "change=","date", "date=",

"gross_yield", "gross_yield=", "id_name", "id_name=",

"listed_yield", "listed_yield=", "name", "name=",

"nav_gbx", "nav_gbx=", "net_yield", "net_yield=",

"percentage_change", "percentage_change=", "time",

"time=", "url", "url="]

fund.save

Fund.restore 'rufferllp/ruffer/RZBST#2008-04-14'

#<Fund:0x1857414 @percentage_change="+0.96",

@gross_yield="-", @id_name="rufferllp/ruffer/RZBST#2008-04-14", @net_yield="-", @bid_offer=false, @date="2008-04-14", @_52w_low="142.38", @listed_yield="-", @time="23:00:14",

@name="Ruffer CF Baker Steel Gold O Acc NAV", @nav_gbx="183.90",

@url="rufferllp/ruffer/RZBST", @change="+1.74", @_52w_high="209.88">

Future features?

identifydata types

e.g. integer, date, string

generate Rails generator line

e.g. script/generate model x:string

y:integer

generate doodle definition!

data == code

http://code.whytheluckystiff.net/hpricot

http://github.com/lazyatom/soup

http://github.com/robmckinnon/morph

http://github.com/robmckinnon/pottery

Technology

data == code | LRUG April 2008