Class: Luaof::Lexer

Inherits:
Object
  • Object
show all
Extended by:
Forwardable
Defined in:
lib/luaof/lexer.rb

Instance Method Summary collapse

Constructor Details

#initialize ⇒ Lexer

Returns a new instance of Lexer.



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# File 'lib/luaof/lexer.rb', line 8

def initialize
  @scanner = StringScanner.new(+'')
end

Instance Method Details

#push(line) {|:linebreak| ... } ⇒ Object

Yields:

  • (:linebreak) 


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# File 'lib/luaof/lexer.rb', line 12

def push(line)
  if line.empty?
    yield :emptyline
    return
  end
  concat(line)
  until eos?
    if skip(/ @ (\w+) ({)? /x)
      if @scanner[2]
        yield({ tag: @scanner[1].intern })
      else
        yield({ keyword: @scanner[1].intern })
      end
    elsif skip('{')
      yield :leftbrace
    elsif skip('}')
      yield :closer
    elsif (text = scan(/ [|] \s* /x))
      yield({ pipe: text })
    elsif (text = scan(/ [^@{}|]+ /x))
      yield text
    else
      raise ">>>#{rest}"
    end
  end
  yield :linebreak
end