Abbrev

计算给定的一组字符串的一组明确的缩写。

require 'abbrev'
require 'pp'

pp Abbrev.abbrev(['ruby'])
#=>  {"ruby"=>"ruby", "rub"=>"ruby", "ru"=>"ruby", "r"=>"ruby"}

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

产生：

{ "ruby"  =>  "ruby",
  "rub"   =>  "ruby",
  "rules" =>  "rules",
  "rule"  =>  "rules",
  "rul"   =>  "rules" }

它还提供了一个数组方法的扩展，Array＃abbrev。

pp %w{ summer winter }.abbrev

产生：

{ "summer"  => "summer",
  "summe"   => "summer",
  "summ"    => "summer",
  "sum"     => "summer",
  "su"      => "summer",
  "s"       => "summer",
  "winter"  => "winter",
  "winte"   => "winter",
  "wint"    => "winter",
  "win"     => "winter",
  "wi"      => "winter",
  "w"       => "winter" }

公共类方法

abbrev(words，pattern = nil) 显示源文件

给定一组字符串，计算这些字符串的明确缩写集合，并返回一个散列，其中键是所有可能的缩写，并且值是完整的字符串。

因此，给定的words是“car”和“cone”，指向“car”的关键将是“ca”和“car”，而指向“cone”的键将是“co”，“con”和“cone”“ 。

require 'abbrev'

Abbrev.abbrev(%w{ car cone })
#=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"}

可选pattern参数是一个模式或一个字符串。输出哈希中只包含匹配模式或以字符串开头的输入字符串。

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 lib/abbrev.rb, line 72
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

私有实例方法

abbrev（words，pattern = nil）显示源文件

给定一组字符串，计算这些字符串的明确缩写集合，并返回一个散列，其中键是所有可能的缩写，并且值是完整的字符串。

因此，给定的words是“car”和“cone”，指向“car”的键将是“ca”和“car”，而指向“cone”的键将是“co”，“con”和“cone”“ 。

require 'abbrev'

Abbrev.abbrev(%w{ car cone })
#=> {"ca"=>"car", "con"=>"cone", "co"=>"cone", "car"=>"car", "cone"=>"cone"}

可选pattern参数是一个模式或一个字符串。输出哈希中只包含匹配模式或以字符串开头的输入字符串。

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 lib/abbrev.rb, line 72
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

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最后更新于：2017-12-18