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Class: Ripper::Filter

Relationships & Source Files
Inherits: Object
Defined in: ext/ripper/lib/ripper/filter.rb

Overview

This class handles only scanner events, which are dispatched in the 'right' order (same with input).

Class Method Summary

Instance Method Summary

Constructor Details

.new(src, filename = '-', lineno = 1) ⇒ Filter

Creates a new Filter instance, passes parameters src, #filename, and #lineno to Ripper::Lexer.new

The lexer is for internal use only.

[ GitHub ] 

  


# File 'ext/ripper/lib/ripper/filter.rb', line 24



def initialize(src, filename = '-', lineno = 1)
  @__lexer = Lexer.new(src, filename, lineno)
  @__line = nil
  @__col = nil
  @__state = nil
end


  







Instance Method Details



  

    #column  
  



  

    

The column number of the current token. This value starts from 0. This method is valid only in event handlers.


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 46



def column
  @__col
end


  








  

    #filename  
  



  

    

The file name of the input.


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 32



def filename
  @__lexer.filename
end


  








  

    #lineno  
  



  

    

The line number of the current token. This value starts from 1. This method is valid only in event handlers.


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 39



def lineno
  @__line
end


  








  

    #on_default(event, token, data)   (private)
  



  

    

This method is called when some event handler is undefined. event is :on_XXX, token is the scanned token, and data is a data accumulator.



The return value of this method is passed to the next event handler (as of Enumerable#inject).


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 80



def on_default(event, token, data)
  data
end


  








  

    #parse(init = nil)  
  



  

    

Starts the parser. init is a data accumulator and is passed to the next event handler (as of Enumerable#inject).


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 59



def parse(init = nil)
  data = init
  @__lexer.lex.each do |pos, event, tok, state|
    @__line, @__col = *pos
    @__state = state
    data = if respond_to?(event, true)
           then __send__(event, tok, data)
           else on_default(event, tok, data)
           end
  end
  data
end


  








  

    #state  
  



  

    

The scanner's state of the current token. This value is the bitwise OR of zero or more of the Ripper::EXPR_* constants.


  



  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/filter.rb', line 52



def state
  @__state
end