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.
-
#min3(a, b, c) ⇒ Object
:nodoc:.
Instance Method Details
#format_text(text, wrap, indent = 0) ⇒ Object
Wraps text
to wrap
characters and optionally indents by indent
characters
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# 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
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# File 'lib/rubygems/text.rb', line 41 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 str1.each_char.each_with_index do |char1,i| e = i+1 str2.each_char.each_with_index do |char2,j| cost = (char1 == char2) ? 0 : 1 x = min3( d[j+1] + 1, # insertion e + 1, # deletion d[j] + cost # substitution ) d[j] = e e = x end d[m] = x end return x end |
#min3(a, b, c) ⇒ Object
:nodoc:
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# File 'lib/rubygems/text.rb', line 29 def min3 a, b, c # :nodoc: if a < b && a < c then a elsif b < c then b else c end end |