Class: Printr::Machine

Inherits:
Object
  • Object
show all
Defined in:
lib/printr.rb

Overview

Instance Methods

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Machine

Returns a new instance of Machine.



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# File 'lib/printr.rb', line 85

def initialize()
  Printr.get_printers
  # You can access these within the views by calling @printr.codes, or whatever
  # you named the instance variable, as it will be snagged by the Binding
  @codes = Printr.codes
  
  # You can override the above codes in the printers.yml, to add
  # say an ASCII header or some nonsense, or if they are using a
  # standard printer etc etc.
  if Printr.conf[:codes] then
    Printr.conf[:codes].each do |key,value|
      Printr.conf[key.to_sym] = value
    end
  end
  Printr.open_printers
end

Dynamic Method Handling

This class handles dynamic methods through the method_missing method

#method_missing(sym, *args, &block) ⇒ Object 



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# File 'lib/printr.rb', line 140

def method_missing(sym, *args, &block)
  Printr.log "[Printr] Called with: #{sym}"
  if Printr.printrs[sym] then
    if args[1].class == Binding then
      Printr.log "Binding was passed"
      print_to(sym,template(args[0],args[1])) #i.e. you call @printr.kitchen('item',binding)
    else
      Printr.log "No Binding was passed"
      print_to(sym,args[0])
    end
  end
end

Instance Method Details



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# File 'lib/printr.rb', line 106

def print_to(key,text)
  Printr.log "[Printr] print_to(#{key},#{text[0..55]})"
  key = key.to_sym
  if text.nil? then
    Printr.log "[Printr] Umm...text is nil dudes..."
    return
  end
  text = sanitize(text)
  if text.nil? then
    Printr.log "[Printr] Sanitize nillified the text..."
  end
  Printr.log "[Printr] Going ahead with printing of: " + text.to_s[0..55]

  Printr.log "[Printr] Printing to device..." + Printr.conf[key]
  begin
    Printr.log "[Printr] Trying to open #{key} #{Printr.printrs[key]} as a SerialPort."
    SerialPort.open(Printr.printrs[key],9600) do |sp|
      sp.write text
    end
    return
  rescue Exception => e
    Printr.log "[Printr] Failed to open #{key} #{Printr.printrs[key]} as a SerialPort: #{e.inspect}. Trying as a File instead."
  end
  begin
    File.open(Printr.conf[key],'w:ISO8859-15') do |f|
      Printr.log "[Printr] Writing text."
      text.force_encoding 'ISO-8859-15'
      f.write text
    end
  rescue Exception => e
    Printr.log "[Printr] Failed to open #{key} #{Printr.printrs[key]} as a File."
  end
end

#sane_template(name, bndng) ⇒ Object 



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# File 'lib/printr.rb', line 186

def sane_template(name,bndng)
  Printr.log "[Printr] attempting to print with template #{RAILS_ROOT}/app/views/#{Printr.scope}/#{name}.prnt.erb"
  begin
    erb = ERB.new(File.new("#{RAILS_ROOT}/app/views/#{Printr.scope}/#{name}.prnt.erb",'r').read,0,'>')
  rescue Exception => e
    Printr.log "[Printr] Exception in view: " + $!.inspect
  end
  Printr.log "[Printr] returning text"
  text = erb.result(bndng)
  if text.nil? then
    text = 'erb result made me nil'
  end
  return sanitize(text)
end

#sanitize(text) ⇒ Object 



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# File 'lib/printr.rb', line 153

def sanitize(text)
  # Printr.sanitize_tokens is a pair array, that is index 0 is the needle and 1 is the replace, 2 is the needle
  # 3 the replacement etc. [needle,replace,needle,replace,needle,replace]
  Printr.log "sanitize(#{text[0..55]})"
  Printr.log "Forcing encoding to: " + Printr.encoding # Printr.encoding can be set in initializer with config.encoding = ISO-8859-15 etc
  begin 
    text.encode! Printr.encoding; 
  rescue
    Printr.log "Failed to encode with #{Printr.encoding}, trying UTF-8"
    begin text.encode! "UTF-8"; rescue; end  
  end
  char = ['ä', 'ü', 'ö', 'Ä', 'Ü', 'Ö', 'é', 'è', 'ú', 'ù', 'á', 'à', 'í', 'ì', 'ó', 'ò', 'â', 'ê', 'î', 'ô', 'û', 'ñ', 'ß']
  replacement = ["\x84", "\x81", "\x94", "\x8E", "\x9A", "\x99", "\x82", "\x8A", "\xA3", "\x97", "\xA0", "\x85", "\xA1", "\x8D", "\xA2", "\x95", "\x83", "\x88", "\x8C", "\x93", "\x96", "\xA4", "\xE1"]
  i = 0
  Printr.log "Adding some tokens to the sanitize array"
  begin
    rx = Regexp.new(char[i].encode(Printr.encoding))
    rep = replacement[i].force_encoding(Printr.encoding)
    Printr.sanitize_tokens << rx
    Printr.sanitize_tokens << rep
    i += 1
  end while i < char.length
  i = 0
  begin
    rx = Printr.sanitize_tokens[i]
    rep = Printr.sanitize_tokens[i+1]
    Printr.log "Replacing: " + rx.to_s + " with " + rep.to_s
    begin text.gsub!(rx, rep); rescue; end
    i += 2
  end while i < Printr.sanitize_tokens.length
  return text
end

#template(name, bndng) ⇒ Object 



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# File 'lib/printr.rb', line 200

def template(name,bndng)
  Printr.log "[Printr] attempting to print with template #{RAILS_ROOT}/app/views/#{Printr.scope}/#{name}.prnt.erb"
  begin
    erb = ERB.new(File.new("#{RAILS_ROOT}/app/views/#{Printr.scope}/#{name}.prnt.erb",'r').read,0,'>')
  rescue Exception => e
    Printr.log "[Printr] Exception in view: " + $!.inspect
  end
  Printr.log "[Printr] returning text"
  text = erb.result(bndng)
  if text.nil? then
    text = 'erb result made me nil'
  end
  return text
end

#test(key) ⇒ Object 



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# File 'lib/printr.rb', line 102

def test(key)
  
end