Module: Textwrap

Defined in:
lib/textwrap.rb

Class Method Summary collapse

Class Method Details

.fill(text, width = 70, options = {}) ⇒ Object

wrap



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# File 'lib/textwrap.rb', line 115

def fill(text, width = 70, options = {})
  wrap(text, width, options).join($/)
end

.wrap(text, width = 70, options = {}) ⇒ Object 



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# File 'lib/textwrap.rb', line 23

def wrap(text, width = 70, options = {})
  if width.kind_of?(Hash)
    options = width
    width = options.fetch(:width, 70)
  end

  initial_indent    = options.fetch(:initial_indent, '')
  subsequent_indent = options.fetch(:subsequent_indent, '')
  break_long_words  = options.fetch(:break_long_words, true)

  code = options.fetch(:code, $KCODE)

  if (m = /\A[esu]/i.match(code))
    code = m[0].downcase
  else
    code = 'n'
  end

  if options.fetch(:expand_tabs, true)
    text = text.gsub(/\t/, '        ') # SP x 8
  end

  if options.fetch(:replace_whitespace, true)
    text = text.gsub(/\t\f/, ' ')
  end

  if options.has_key?(:consider_linebreak_whitespace)
    consider_linebreak_whitespace = options[:consider_linebreak_whitespace]
  elsif code == 'n'
    consider_linebreak_whitespace = true
  else
    consider_linebreak_whitespace = false
  end

  gauge_width = lambda {|str|
    w = 0

    str.scan(Regexp.new('.', nil, code)) do |c|
      w += (c[0] <= 0x7f) ? 1 : 2
    end

    return w
  }

  if options.fetch(:break_long_words, true)
    break_word = lambda {|src, scnr|
      return [src, scnr] if gauge_width.call(src) <= width
      w = 0; dest = ''

      src.scan(Regexp.new('.', nil, code)) do |c|
        w += (c[0] <= 0x7f) ? 1 : 2

        break if w > width
        dest << c
      end

      new_scnr = StringScanner.new(src.slice(dest.length..-1) + scnr.rest)
      return [dest, new_scnr]
    }
  else
    break_word = lambda {|str, scnr| [str, scnr]}
  end

  regexps = [/\s+/, /\S+/]
  s = StringScanner.new(text.split(/[\r\n]+/).join(consider_linebreak_whitespace ? ' ' : ''))
  lines = []
  indent = initial_indent
  word = s.scan(regexps.reverse!.first) || s.scan(regexps.reverse!.first) || ''
  word, s = break_word.call(word, s)
  words = [word]

  until s.eos?
    word = s.scan(regexps.reverse!.first) or next
    word, s = break_word.call(word, s)
    line = indent + words.join.sub(/\A\s+/, '')

    if gauge_width.call(line + word) > width
      lines << line.sub(/\s+\Z/, '')
      words.clear
      indent = subsequent_indent
    end

    words << word
  end

  unless words.empty?
    lines << indent + words.join.strip
  end

  return lines
end