Class: StringSnip

Inherits:
Object
  • Object
show all
Defined in:
lib/gren/common/string_snip.rb

Class Method Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(size = 256, delimiter = '<<snip>>', pri = nil) ⇒ StringSnip

Returns a new instance of StringSnip.



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# File 'lib/gren/common/string_snip.rb', line 4

def initialize(size = 256, delimiter = '<<snip>>', pri = nil)
  @size = size
  @delimiter = delimiter
  @pri = pri
end

Class Method Details

.index_conv(str, value) ⇒ Object 



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# File 'lib/gren/common/string_snip.rb', line 32

def self.index_conv(str, value)
  if (value < 0)
    str.size + value
  else
    value
  end
end

.ranges_compound(ranges) ⇒ Object 



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# File 'lib/gren/common/string_snip.rb', line 44

def self.ranges_compound(ranges)
  result = []
  
  index = 0
  while (ranges.size > 0)
    if (ranges.size > 1 && ranges[0].end + 1 >= ranges[1].begin)
      v1, v2 = ranges.shift(2)
      ranges.unshift v1.begin..((v1.end > v2.end) ? v1.end : v2.end)
    else
      result << ranges.shift
    end
  end

  result
end

.ranges_conv(ranges, str) ⇒ Object 



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# File 'lib/gren/common/string_snip.rb', line 28

def self.ranges_conv(ranges, str)
  ranges.map {|i| index_conv(str, i.begin)..index_conv(str, i.end)}
end

.ranges_sort(ranges) ⇒ Object 



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# File 'lib/gren/common/string_snip.rb', line 40

def self.ranges_sort(ranges)
  ranges.sort_by{|i| i.begin}
end

Instance Method Details

#snip(str, ranges) ⇒ Object 



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# File 'lib/gren/common/string_snip.rb', line 10

def snip(str, ranges)
  @str = str
  @ranges = ranges

  # no snip
  return @str if (@str.size <= @size)

  # snip
  @ranges = StringSnip::ranges_conv(@ranges, @str)
  @ranges = StringSnip::ranges_sort(@ranges)
  @ranges = StringSnip::ranges_compound(@ranges)

  # result
  results = []
  @ranges.each {|r| results << @str[r] }
  return results.join(@delimiter)
end