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Class: Ripper::TokenPattern

Do not use. This class is for internal use only.
Relationships & Source Files
Namespace Children
Classes:
MatchData
Exceptions:
CompileError, Error, MatchError
Inherits: Object
Defined in: ext/ripper/lib/ripper/lexer.rb

Constant Summary

Class Method Summary

Instance Method Summary

Constructor Details

.new(pattern) ⇒ TokenPattern

[ GitHub ] 

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 299



def initialize(pattern)
  @source = pattern
  @re = compile(pattern)
end


  







Class Method Details



  

    .compile  
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 296



alias compile new


  







Instance Method Details



  

    #compile(pattern)   (private)
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 317



def compile(pattern)
  if m = /[^\w\s$()\[\]{}?*+\.]/.match(pattern)
    raise CompileError, "invalid char in pattern: #{m[0].inspect}"
  end
  buf = +''
  pattern.scan(/(?:\w|\$\(|[()\[\]\{\}?*\.]+)/) do |tok|
    case tok
    when /\w/
      buf.concat map_token(tok)
    when '$('
      buf.concat '('
    when '('
      buf.concat '(?:'
    when /[?*\[\])\.]/
      buf.concat tok
    else
      raise 'must not happen'
    end
  end
  Regexp.compile(buf)
rescue RegexpError => err
  raise CompileError, err.message
end


  








  

    #map_token(tok)   (private)
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 352



def map_token(tok)
  MAP[tok]  or raise CompileError, "unknown token: #{tok}"
end


  








  

    #map_tokens(tokens)   (private)
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 341



def map_tokens(tokens)
  tokens.map {|pos,type,str| map_token(type.to_s.delete_prefix('on_')) }.join
end


  








  

    #match(str)  
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 304



def match(str)
  match_list(::Ripper.lex(str))
end


  








  

    #match_list(tokens)  
  

  [ GitHub ]


  

  


# File 'ext/ripper/lib/ripper/lexer.rb', line 308



def match_list(tokens)
  if m = @re.match(map_tokens(tokens))
  then MatchData.new(tokens, m)
  else nil
  end
end