# frozen_string_literal: true

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#--

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# Copyright (c) 2001,2003 Akinori MUSHA <knu@iDaemons.org>

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#

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# All rights reserved. You can redistribute and/or modify it under

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# the same terms as Ruby.

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#

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# $Idaemons: /home/cvs/rb/abbrev.rb,v 1.2 2001/05/30 09:37:45 knu Exp $

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# $RoughId: abbrev.rb,v 1.4 2003/10/14 19:45:42 knu Exp $

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# $Id$

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#++

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##

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# Calculates the set of unambiguous abbreviations for a given set of strings.

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#

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# require 'abbrev'

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# require 'pp'

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#

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# pp Abbrev.abbrev(['ruby'])

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# #=> {"ruby"=>"ruby", "rub"=>"ruby", "ru"=>"ruby", "r"=>"ruby"}

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#

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# pp Abbrev.abbrev(%w{ ruby rules })

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#

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# _Generates:_

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# { "ruby" => "ruby",

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# "rub" => "ruby",

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# "rules" => "rules",

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# "rule" => "rules",

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# "rul" => "rules" }

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#

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# It also provides an array core extension, Array#abbrev.

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#

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# pp %w{ summer winter }.abbrev

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#

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# _Generates:_

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# { "summer" => "summer",

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# "summe" => "summer",

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# "summ" => "summer",

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# "sum" => "summer",

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# "su" => "summer",

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# "s" => "summer",

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# "winter" => "winter",

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# "winte" => "winter",

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# "wint" => "winter",

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# "win" => "winter",

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# "wi" => "winter",

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# "w" => "winter" }

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module Abbrev

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# Given a set of strings, calculate the set of unambiguous abbreviations for

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# those strings, and return a hash where the keys are all the possible

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# abbreviations and the values are the full strings.

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#

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# Thus, given +words+ is "car" and "cone", the keys pointing to "car" would

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# be "ca" and "car", while those pointing to "cone" would be "co", "con", and

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# "cone".

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#

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# require 'abbrev'

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#

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# Abbrev.abbrev(%w{ car cone })

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# #=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"}

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#

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# The optional +pattern+ parameter is a pattern or a string. Only input

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# strings that match the pattern or start with the string are included in the

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# output hash.

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#

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# Abbrev.abbrev(%w{car box cone crab}, /b/)

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# #=> {"box"=>"box", "bo"=>"box", "b"=>"box", "crab" => "crab"}

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#

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# Abbrev.abbrev(%w{car box cone}, 'ca')

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# #=> {"car"=>"car", "ca"=>"car"}

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def abbrev(words, pattern = nil)

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table = {}

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seen = Hash.new(0)

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if pattern.is_a?(String)

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pattern = /\A#{Regexp.quote(pattern)}/ # regard as a prefix

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end

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words.each do |word|

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next if word.empty?

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word.size.downto(1) { |len|

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abbrev = word[0...len]

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next if pattern && pattern !~ abbrev

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case seen[abbrev] += 1

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when 1

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table[abbrev] = word

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when 2

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table.delete(abbrev)

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else

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break

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end

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}

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end

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words.each do |word|

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next if pattern && pattern !~ word

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table[word] = word

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end

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table

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end

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module_function :abbrev

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end

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class Array

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# Calculates the set of unambiguous abbreviations for the strings in +self+.

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#

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# require 'abbrev'

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# %w{ car cone }.abbrev

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# #=> {"car"=>"car", "ca"=>"car", "cone"=>"cone", "con"=>"cone", "co"=>"cone"}

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#

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# The optional +pattern+ parameter is a pattern or a string. Only input

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# strings that match the pattern or start with the string are included in the

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# output hash.

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#

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# %w{ fast boat day }.abbrev(/^.a/)

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# #=> {"fast"=>"fast", "fas"=>"fast", "fa"=>"fast", "day"=>"day", "da"=>"day"}

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#

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# Abbrev.abbrev(%w{car box cone}, "ca")

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# #=> {"car"=>"car", "ca"=>"car"}

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#

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# See also Abbrev.abbrev

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def abbrev(pattern = nil)

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Abbrev::abbrev(self, pattern)

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end

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end

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