Class: KPeg::LiteralRegexp

Inherits:
Operator show all
Defined in:
lib/kpeg/grammar.rb

Instance Attribute Summary collapse

Attributes inherited from Operator

#action

Instance Method Summary collapse

Methods inherited from Operator

#detect_tags, #inspect_type, #prune_values, #set_action, #|

Constructor Details

#initialize(reg, opts = nil) ⇒ LiteralRegexp

Returns a new instance of LiteralRegexp.



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# File 'lib/kpeg/grammar.rb', line 104

def initialize(reg, opts=nil)
  super()

  if reg.kind_of? String
    flags = 0
    lang = nil

    if opts
      opts.split("").each do |o|
        case o
        when "n", "N", "e", "E", "s", "S"
          lang = o.downcase
        when "u", "U"
          if RUBY_VERSION > "1.8.7"
            # Ruby 1.9 defaults to UTF-8 for string matching
            lang = ""
          else
            lang = "u"
          end
        when "m"
          flags |= Regexp::MULTILINE
        when "x"
          flags |= Regexp::EXTENDED
        when "i"
          flags |= Regexp::IGNORECASE
        end
      end
    end

    @regexp = Regexp.new(reg, flags, lang)
  else
    @regexp = reg
  end
end

Instance Attribute Details

#regexp ⇒ Object (readonly)

Returns the value of attribute regexp.



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# File 'lib/kpeg/grammar.rb', line 139

def regexp
  @regexp
end

Instance Method Details

#==(obj) ⇒ Object 



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# File 'lib/kpeg/grammar.rb', line 153

def ==(obj)
  case obj
  when LiteralRegexp
    @regexp == obj.regexp
  else
    super
  end
end

#inspect ⇒ Object 



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# File 'lib/kpeg/grammar.rb', line 162

def inspect
  inspect_type 'reg', @regexp.inspect
end

#match(x) ⇒ Object 



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# File 'lib/kpeg/grammar.rb', line 145

def match(x)
  if str = x.scan(@regexp)
    MatchString.new(self, str)
  else
    x.fail(self)
  end
end

#string ⇒ Object 



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# File 'lib/kpeg/grammar.rb', line 141

def string
  @regexp.source
end