Class: FileCharLicker::MbLicker

Inherits:
Licker
  • Object
show all
Defined in:
lib/file_char_licker/licker/mb_licker.rb

Instance Attribute Summary collapse

Instance Method Summary collapse

Methods inherited from Licker

#backward_lines, #current_line, #forward_lines, #seek_contiguous_max, #seek_contiguous_min

Constructor Details

#initialize(file, encoding = 'utf-8') ⇒ MbLicker

Returns a new instance of MbLicker.



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 7

def initialize(file, encoding = 'utf-8')

  super(file)
  init_encoding_variables(encoding)

  @mb_bytesize_max = 6
end

Instance Attribute Details

#encoding ⇒ Object (readonly)

Returns the value of attribute encoding.



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 5

def encoding
  @encoding
end

#kconv_checker ⇒ Object (readonly)

Returns the value of attribute kconv_checker.



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 5

def kconv_checker
  @kconv_checker
end

#mb_bytesize_max ⇒ Object

Returns the value of attribute mb_bytesize_max.



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 4

def mb_bytesize_max
  @mb_bytesize_max
end

#nkf_option ⇒ Object (readonly)

Returns the value of attribute nkf_option.



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 5

def nkf_option
  @nkf_option
end

Instance Method Details

#around_lines(*args) ⇒ Object

get lines around for passed file#pos



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 16

def around_lines(*args)

  lines = super(*args)
  NKF.nkf(@nkf_option, lines)
end

#backward_char ⇒ Object

get a backword character from file#pos

instance variables

mb_bytesize_max ... max bytesize for multibyte character

args

update_flag     ... if true, update file#pos for backward character's head

returner

String object ... exists
          nil ... not exists



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 33

def backward_char

  file    = @file
  pos_max = file.pos - 1
  pos_min = pos_max - @mb_bytesize_max

  pos_max.downto(pos_min) do |pos|

    break if pos < 0

    file.seek(pos)
    char = file.getc

    # return file#getc character
    # - when that is regular for multibyte character
    return char if check_mb(char)
  end

  nil
end

#seek_line_head ⇒ Object 



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# File 'lib/file_char_licker/licker/mb_licker.rb', line 54

def seek_line_head

  file = @file

  # loop
  # - move pointer until reach to EOL of before line.
  while file.pos > 0

    char = backward_char

    # break
    # - if did not get backward character
    # - if got character is a line break character
    break if char.nil? || char.match(/[\r\n]/)

    # backward pos as bytesize of char
    file.seek(-(char.bytesize), IO::SEEK_CUR)
  end

  file.pos
end