class String
Public Instance Methods
-(number)
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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)
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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)
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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)
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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