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# frozen_string_literal: true #-- # Copyright (c) 2001,2003 Akinori MUSHA <knu@iDaemons.org> # # All rights reserved. You can redistribute and/or modify it under # the same terms as Ruby. # # $Idaemons: /home/cvs/rb/abbrev.rb,v 1.2 2001/05/30 09:37:45 knu Exp $ # $RoughId: abbrev.rb,v 1.4 2003/10/14 19:45:42 knu Exp $ # $Id$ #++ ## # Calculates the set of unambiguous abbreviations for a given set of strings. # # require 'abbrev' # require 'pp' # # pp Abbrev.abbrev(['ruby']) # #=> {"ruby"=>"ruby", "rub"=>"ruby", "ru"=>"ruby", "r"=>"ruby"} # # pp Abbrev.abbrev(%w{ ruby rules }) # # _Generates:_ # { "ruby" => "ruby", # "rub" => "ruby", # "rules" => "rules", # "rule" => "rules", # "rul" => "rules" } # # It also provides an array core extension, Array#abbrev. # # pp %w{ summer winter }.abbrev # # _Generates:_ # { "summer" => "summer", # "summe" => "summer", # "summ" => "summer", # "sum" => "summer", # "su" => "summer", # "s" => "summer", # "winter" => "winter", # "winte" => "winter", # "wint" => "winter", # "win" => "winter", # "wi" => "winter", # "w" => "winter" } module Abbrev # Given a set of strings, calculate the set of unambiguous abbreviations for # those strings, and return a hash where the keys are all the possible # abbreviations and the values are the full strings. # # Thus, given +words+ is "car" and "cone", the keys pointing to "car" would # be "ca" and "car", while those pointing to "cone" would be "co", "con", and # "cone". # # require 'abbrev' # # Abbrev.abbrev(%w{ car cone }) # #=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"} # # The optional +pattern+ parameter is a pattern or a string. Only input # strings that match the pattern or start with the string are included in the # output hash. # # Abbrev.abbrev(%w{car box cone crab}, /b/) # #=> {"box"=>"box", "bo"=>"box", "b"=>"box", "crab" => "crab"} # # Abbrev.abbrev(%w{car box cone}, 'ca') # #=> {"car"=>"car", "ca"=>"car"} def abbrev(words, pattern = nil) table = {} seen = Hash.new(0) if pattern.is_a?(String) pattern = /\A#{Regexp.quote(pattern)}/ # regard as a prefix end words.each do |word| next if word.empty? word.size.downto(1) { |len| abbrev = word[0...len] next if pattern && pattern !~ abbrev case seen[abbrev] += 1 when 1 table[abbrev] = word when 2 table.delete(abbrev) else break end } end words.each do |word| next if pattern && pattern !~ word table[word] = word end table end module_function :abbrev end class Array # Calculates the set of unambiguous abbreviations for the strings in +self+. # # require 'abbrev' # %w{ car cone }.abbrev # #=> {"car"=>"car", "ca"=>"car", "cone"=>"cone", "con"=>"cone", "co"=>"cone"} # # The optional +pattern+ parameter is a pattern or a string. Only input # strings that match the pattern or start with the string are included in the # output hash. # # %w{ fast boat day }.abbrev(/^.a/) # #=> {"fast"=>"fast", "fas"=>"fast", "fa"=>"fast", "day"=>"day", "da"=>"day"} # # Abbrev.abbrev(%w{car box cone}, "ca") # #=> {"car"=>"car", "ca"=>"car"} # # See also Abbrev.abbrev def abbrev(pattern = nil) Abbrev::abbrev(self, pattern) end end