Gem::Text

A collection of text-wrangling methods

Public Instance Methods

clean_text(text) click to toggle source

Remove any non-printable characters and make the text suitable for printing.

 
               # File rubygems/text.rb, line 11
def clean_text(text)
  text.gsub(/[\000-\b\v-\f\016-\037\177]/, ".".freeze)
end

format_text(text, wrap, indent=0) click to toggle source

Wraps text to wrap characters and optionally indents by indent characters

 
               # File rubygems/text.rb, line 25
def format_text(text, wrap, indent=0)
  result = []
  work = clean_text(text)

  while work.length > wrap do
    if work =~ /^(.{0,#{wrap}})[ \n]/
      result << $1.rstrip
      work.slice!(0, $&.length)
    else
      result << work.slice!(0, wrap)
    end
  end

  result << work if work.length.nonzero?
  result.join("\n").gsub(/^/, " " * indent)
end

levenshtein_distance(str1, str2) click to toggle source

Returns a value representing the “cost” of transforming str1 into str2 Vendored version of DidYouMean::Levenshtein.distance from the ruby/did_you_mean gem @ 1.4.0 git.io/JJgZI

 
               # File rubygems/text.rb, line 55
def levenshtein_distance(str1, str2)
  n = str1.length
  m = str2.length
  return m if n.zero?
  return n if m.zero?

  d = (0..m).to_a
  x = nil

  # to avoid duplicating an enumerable object, create it outside of the loop
  str2_codepoints = str2.codepoints

  str1.each_codepoint.with_index(1) do |char1, i|
    j = 0
    while j < m
      cost = (char1 == str2_codepoints[j]) ? 0 : 1
      x = min3(
        d[j + 1] + 1, # insertion
        i + 1,      # deletion
        d[j] + cost # substitution
      )
      d[j] = i
      i = x

      j += 1
    end
    d[m] = x
  end

  x
end

truncate_text(text, description, max_length = 100_000) click to toggle source

 
               # File rubygems/text.rb, line 15
def truncate_text(text, description, max_length = 100_000)
  raise ArgumentError, "max_length must be positive" unless max_length > 0
  return text if text.size <= max_length
  "Truncating #{description} to #{max_length.to_s.reverse.gsub(/...(?=.)/,'\&,').reverse} characters:\n" + text[0, max_length]
end