Class: AndDistance

Inherits:
Object
  • Object
show all
Defined in:
lib/glark/match/and_distance.rb

Constant Summary collapse

INFINITE_DISTANCE =

signifies no limit to the distance between matches, i.e., anywhere within the entire file is valid.

-1
AND_EQ_NUM_RE = 
Regexp.new '^--and=(\-?\d+)?$'

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arg, args) ⇒ AndDistance 



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# File 'lib/glark/match/and_distance.rb', line 22

def initialize arg, args
  @distance = if arg == "-a"
                args.shift
              elsif arg == "--and"
                if args.size > 0 && numeric?(args[0])
                  args.shift
                else
                  "0"
                end
              elsif md = AND_EQ_NUM_RE.match(arg)
                md[1]
              else
                raise "invalid 'and' option: '#{arg}'"
              end
  
  # check to ensure that this is numeric
  if !numeric? @distance
    raise "invalid distance for 'and' expression: '#{@distance}'\n" +
      "    expecting an integer, or #{INFINITE_DISTANCE} for 'infinite'" 
  end
  
  if @distance.to_i == INFINITE_DISTANCE
    @distance = 1.0 / 0.0            # infinity
  else
    @distance = @distance.to_i
  end

  @distance
end

Instance Attribute Details

#distance ⇒ Object (readonly)

Returns the value of attribute distance.



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# File 'lib/glark/match/and_distance.rb', line 20

def distance
  @distance
end

Instance Method Details

#numeric?(x) ⇒ Boolean 



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# File 'lib/glark/match/and_distance.rb', line 52

def numeric? x
  return nil unless x
  return true if x.kind_of?(Fixnum) || x.to_i == INFINITE_DISTANCE
  begin
    Integer x
  rescue ArgumentError
    nil
  end
end