Class: MCollective::Matcher::Scanner

Inherits:
Object
  • Object
show all
Defined in:
lib/mcollective/matcher/scanner.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(arguments) ⇒ Scanner

Returns a new instance of Scanner.



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# File 'lib/mcollective/matcher/scanner.rb', line 6

def initialize(arguments)
  @token_index = 0
  @arguments = arguments
end

Instance Attribute Details

#arguments ⇒ Object

Returns the value of attribute arguments.



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# File 'lib/mcollective/matcher/scanner.rb', line 4

def arguments
  @arguments
end

#token_index ⇒ Object

Returns the value of attribute token_index.



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# File 'lib/mcollective/matcher/scanner.rb', line 4

def token_index
  @token_index
end

Instance Method Details

#get_token ⇒ Object

Scans the input string and identifies single language tokens



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# File 'lib/mcollective/matcher/scanner.rb', line 12

def get_token
  if @token_index >= @arguments.size
    return nil
  end

  begin
    case @arguments.split("")[@token_index]
    when "("
      return "(", "("

    when ")"
      return ")", ")"

    when "n"
      if (@arguments.split("")[@token_index + 1] == "o") && (@arguments.split("")[@token_index + 2] == "t") && ((@arguments.split("")[@token_index + 3] == " ") || (@arguments.split("")[@token_index + 3] == "("))
        @token_index += 2
        return "not", "not"
      else
        gen_statement
      end

    when "!"
      return "not", "not"

    when "a"
      if (@arguments.split("")[@token_index + 1] == "n") && (@arguments.split("")[@token_index + 2] == "d") && ((@arguments.split("")[@token_index + 3] == " ") || (@arguments.split("")[@token_index + 3] == "("))
        @token_index += 2
        return "and", "and"
      else
        gen_statement
      end

    when "o"
      if (@arguments.split("")[@token_index + 1] == "r") && ((@arguments.split("")[@token_index + 2] == " ") || (@arguments.split("")[@token_index + 2] == "("))
        @token_index += 1
        return "or", "or"
      else
        gen_statement
      end

    when " "
      return " ", " "

    else
      gen_statement
    end
  end
rescue NoMethodError => e
  pp e
  raise "Cannot end statement with 'and', 'or', 'not'"
end