Class: String

Inherits:
Object
  • Object
show all
Defined in:
lib/NextNumber/standard_types.rb

Instance Method Summary collapse

Instance Method Details

#-(number) ⇒ Object

两个字符串相减，得到两个字符串之间相减的数量例如：

"abc"-"abc"           ->0
"abc110"-"abc100"     ->10
"110abc"-"100abc"     ->10



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# File 'lib/NextNumber/standard_types.rb', line 38

def -(number)
  match1 = /\d+/.match(self)
  match2 = /\d+/.match(number)
  (match1 && match2) ? match1[0].to_i - match2[0].to_i : 0
end

#next_number(qty = 1) ⇒ Object

得到字符串的下一个编号，是对字符串中数值区域的值的增加，如果该字符串没有数值区域，那么返回原字符串例如‘abc’.next_number -> abc ‘abc100’.next_number ->abc101 ‘100’.next_number ->101 ‘100abc’.next_number ->101abc ‘0100abc’.next_number ->0101abc ‘0099abc’.next_number ->0100abc “abc100”.next_number(10) ->“abc110” “100abc”.next_number(10) ->“110abc” “100abc100”.next_number(10) ->“100abc110”



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# File 'lib/NextNumber/standard_types.rb', line 29

def next_number(qty=1)
  self.reverse.sub(/(0*)\d+/) { |match| (match.reverse.to_i+qty.to_i).to_s.rjust(match.length,"0").reverse }.reverse      
end

#region_sizeof(number) ⇒ Object

计算两个区段之间的大小，区段是包含首尾部分例如：“a100”.region_sizeof(“a100”) ->1 “a100”.region_sizeof(“a101”) ->2



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# File 'lib/NextNumber/standard_types.rb', line 56

def region_sizeof(number)
  (self-number).abs+1
end

#region_to(qty = 1) ⇒ Object

从当前区段得到下一区段，区段的间隔由qty指定，区段包括首尾部分例如：“a100”.region_to(1) ->“a100” “a100”.region_to(2) ->“a101”



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# File 'lib/NextNumber/standard_types.rb', line 48

def region_to(qty=1)    
  raise "参数不允许为0" if qty==0
  next_number(qty<0? qty+1:  qty-1)
end