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" }
# File tmp/rubies/ruby-2.7.6/lib/abbrev.rb, line 73
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
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"}
# File tmp/rubies/ruby-2.7.6/lib/abbrev.rb, line 73
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
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"}