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class Ripper::Filter

Parent:: Object

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

Public Class Methods

new(src, filename = '-', lineno = 1) Show source

# 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

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

The lexer is for internal use only.

Public Instance Methods

column() Show source

# File ext/ripper/lib/ripper/filter.rb, line 46
def column
  @__col
end

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

filename() Show source

# File ext/ripper/lib/ripper/filter.rb, line 32
def filename
  @__lexer.filename
end

The file name of the input.

lineno() Show source

# File ext/ripper/lib/ripper/filter.rb, line 39
def lineno
  @__line
end

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

parse(init = nil) Show source

# 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

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

state() Show source

# File ext/ripper/lib/ripper/filter.rb, line 52
def state
  @__state
end

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

Private Instance Methods

on_default(event, token, data) Show source

# File ext/ripper/lib/ripper/filter.rb, line 80
def on_default(event, token, data)
  data
end

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).

Ruby Core © 1993–2020 Yukihiro Matsumoto
Licensed under the Ruby License.
Ruby Standard Library © contributors
Licensed under their own licenses.