Module: Gem::Text
- Included in:
- Commands::QueryCommand, SpecFetcher
- Defined in:
- lib/rubygems/text.rb
Overview
A collection of text-wrangling methods
Instance Method Summary collapse
-
#format_text(text, wrap, indent = 0) ⇒ Object
Wraps
text
towrap
characters and optionally indents byindent
characters. -
#levenshtein_distance(str1, str2) ⇒ Object
This code is based directly on the Text gem implementation Returns a value representing the “cost” of transforming str1 into str2.
Instance Method Details
#format_text(text, wrap, indent = 0) ⇒ Object
Wraps text
to wrap
characters and optionally indents by indent
characters
12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 |
# File 'lib/rubygems/text.rb', line 12 def format_text(text, wrap, indent=0) result = [] work = text.dup while work.length > wrap do if work =~ /^(.{0,#{wrap}})[ \n]/ then 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) ⇒ Object
This code is based directly on the Text gem implementation Returns a value representing the “cost” of transforming str1 into str2
31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 |
# File 'lib/rubygems/text.rb', line 31 def levenshtein_distance str1, str2 s = str1 t = str2 n = s.length m = t.length max = n/2 return m if (0 == n) return n if (0 == m) return n if (n - m).abs > max d = (0..m).to_a x = nil n.times do |i| e = i+1 m.times do |j| cost = (s[i] == t[j]) ? 0 : 1 x = [ d[j+1] + 1, # insertion e + 1, # deletion d[j] + cost # substitution ].min d[j] = e e = x end d[m] = x end return x end |