class String

Public Instance Methods

-(number) click to toggle source

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
# File lib/NextNumber/standard_types.rb, line 37
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) click to toggle source

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"
# File lib/NextNumber/standard_types.rb, line 28
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) click to toggle source

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
# File lib/NextNumber/standard_types.rb, line 55
def region_sizeof(number)
  (self-number).abs+1
end
region_to(qty=1) click to toggle source

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"
# File lib/NextNumber/standard_types.rb, line 47
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