Class: FileFilter::Formatter

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

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(template) ⇒ Formatter

Returns a new instance of Formatter.



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# File 'lib/inplace.rb', line 440

def initialize(template)
  @template = template.dup

  begin
    self.format("0", "1", "2")
  rescue => e
    raise e
  end

  if @arity == 0
    @template = "(#{@template}) < %1 > %2"
    @arity = 2
  end
end

Instance Attribute Details

#arity ⇒ Object (readonly)

Returns the value of attribute arity.



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# File 'lib/inplace.rb', line 455

def arity
  @arity
end

#template ⇒ Object (readonly)

Returns the value of attribute template.



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# File 'lib/inplace.rb', line 455

def template
  @template
end

Instance Method Details

#format(origfile, infile, outfile = nil) ⇒ Object 



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# File 'lib/inplace.rb', line 457

def format(origfile, infile, outfile = nil)
  s = ''
  template = @template.dup
  arity_bits = 0

  until template.empty?
    template.sub!(/\A([^%]+)/) {
      s << $1
      ''
    }
    template.sub!(/\A%(.)/) {
      case c = $1
      when '%'
        s << c
      when '0'
        s << origfile.shellescape
      when '1'
        s << infile.shellescape
        arity_bits |= 0x1
      when '2'
        s << outfile.shellescape
        arity_bits |= 0x2
      else
        raise ArgumentError, "invalid placeholder specification (%#{c}): #{@template}"
      end
      ''
    }
  end

  case arity_bits
  when 0x0
    @arity = 0
  when 0x1
    @arity = 1
  when 0x2
    raise ArgumentError, "%1 is missing while %2 is specified: #{@template}"
  when 0x3
    @arity = 2
  end

  return s
end